CN103033667A - Current measurement device and method - Google Patents

Abstract

The invention discloses a current measuring device, which comprises a Hall current sensor, a multi-range Hall current sensor, a current converting device and a current value comparing device. By selecting one of the ranges of the multi-range Hall current sensor and measuring its voltage value corresponding to the current to be measured, and then converting the current corresponding to the other ranges if the other ranges of the multi-range Hall current sensor are connected to the current to be measured value, the corresponding current value in each range of the multi-range Hall current sensor will be compared with the reference current value, and the most accurate current value in the appropriate range will be selected as the measurement result. The invention also discloses a The current measurement method, through the above-mentioned current measurement device and method, does not need to be plugged and unplugged to switch between ranges for measuring current, and the current value of a suitable range can be automatically measured by selecting a range at will, making the current measurement more intelligent.

Description

Current measuring device and method

technical field

The invention relates to the field of electronic information, in particular to a current measuring device and method.

Background technique

The current parameter is one of the important parameters in the test of electronic components, and its measurement is the basic link to realize the monitoring. Using Hall sensors to measure DC current is a common non-contact current measurement method.

A general current measuring device needs to select an appropriate range when using a Hall sensor to obtain a more accurate measurement value. If there is a range that is more accurate than the range that is connected to the measurement, it is often necessary to change to another one. For a more accurate range, the user often needs to obtain the measurement result first, and then judge whether the connected range is the best range according to the measurement result. The time period for obtaining the precise current value you need is greatly lengthened, and at the same time, the operation of current measurement is more complicated and not intelligent enough.

Contents of the invention

Based on this, it is necessary to provide a current measuring device and method capable of automatically switching ranges for the problem that the operation of the existing current measuring device is relatively complicated.

A current measuring device, comprising a Hall current sensor, a multi-range Hall current sensor, a current conversion device and a current value comparison device;

The range of the Hall current sensor is the maximum range of the current measuring device, and the current to be measured is converted into a voltage by the Hall current sensor;

The multi-range Hall current sensor includes two or more ranges, the current to be measured is converted into a corresponding voltage by the corresponding range in the multi-range Hall current sensor, and the inner coil of the multi-range Hall current sensor is connected to The inner coils of the Hall current sensor are connected in parallel. When using any range in the multi-range Hall current sensor to measure the current to be measured, the current to be measured passes through the Hall current sensor. If the current to be measured passes through the Hall current sensor for measurement, the current to be measured only passes through the Hall current sensor;

The current conversion device converts the magnitude of the voltage into a current value according to the Hall effect, and the Hall current sensor converts the magnitude of the voltage converted into a current value as a reference current value. If the current to be measured is connected to the Hall If the current sensor is used to measure, the voltage corresponding to the current to be measured is obtained, and the current value of the current to be measured is directly converted according to the Hall effect. If any range of the multi-range Hall current sensor is used to measure the current to be measured, the The current conversion device also converts the current value when each range of the multi-range Hall current sensor passes through the current to be measured according to the magnitude of the voltage output by the multi-range Hall current sensor;

The current value comparison device compares the current value obtained by the current conversion device when each range of the multi-range Hall current sensor passes the current to be measured with the reference current value, and selects the current value closest to the reference current value. The current value of the current value is used as the measured current value.

In one of the embodiments, the current measuring device further includes an over-range judging device, and the over-range judging device is used for when the current value converted by the current conversion device exceeds the corresponding connection range, the over-range judgment The device determines that the current connection to be measured exceeds the range.

In one of the embodiments, in the automatic range conversion current measurement device, the range of the Hall current sensor and two or more ranges of the multi-range Hall current sensor are sequentially decreased in a predetermined multiple relationship.

In one of the embodiments, in the automatic range switching current measuring device, the measuring range of the Hall current sensor is 50A.

In one of the embodiments, in the automatic range switching current measuring device, the predetermined multiple is 5 times.

A current measurement method, comprising the steps of:

The ranges of the Hall current sensor and the multi-range Hall current sensor are set in advance, and the range of the Hall current sensor is set as the maximum range, and the multi-range Hall current sensor has two or more ranges. The inner coil of the multi-range Hall current sensor is connected in parallel with the inner coil of the Hall current sensor, and any range is connected to measure the current to be measured;

If the current to be measured is connected to the Hall current sensor for measurement, the voltage corresponding to the current to be measured is obtained, and the current value of the current to be measured is directly converted according to the Hall effect. If the current to be measured is connected to the multi-range Hall current If the sensor is measured in any range, the corresponding voltage value of the current to be measured connected to any range of the multi-range Hall current sensor for measurement and the voltage value when the current to be measured passes through the Hall current sensor are obtained;

According to the conversion of the Hall effect, the current value of the current to be measured passing through the Hall current sensor and the current value of the range connected through the multi-range Hall current sensor are obtained, and the converted Hall current sensor is measured The current value is used as the reference current value, and the current value of the current to be measured passing through each range in the multi-range Hall current sensor is converted according to the voltage value obtained by connecting the current to be measured to any range of the multi-range Hall current sensor;

Comparing the converted current value of the current to be measured passing through each range in the multi-range Hall current sensor with the reference current value, and selecting the current value closest to the reference current value as the measured current value.

In one of the embodiments, the current measurement method, when comparing the corresponding current value with the reference current value, further includes the step: when the current value converted by the current conversion device exceeds the corresponding connection range , the over-range judging device judges that the current to be measured is connected over-range.

In one of the embodiments, in the current measurement method, the range of the Hall current sensor is set to decrease sequentially with a predetermined multiple relationship with two or more ranges of the multi-range Hall current sensor.

In one of the embodiments, the current measurement method determines that the maximum measurement range of the measured current is 50A.

In one of the embodiments, in the current measurement method, the predetermined multiple is determined to be 5 times.

The above-mentioned current measurement device and method are connected in parallel with the inner coil of the Hall current sensor by the multi-range Hall current sensor, so that when the current to be measured is selected from any range in the multi-range Hall current sensor for measurement, the to-be-measured current through the Hall current sensor. If the current to be measured is connected to any range of the multi-range Hall current sensor for measurement, then the measured current is connected to any range of the multi-range Hall current sensor to measure the voltage value and the current to be measured passes through the Hall current. The voltage value of the sensor, and then according to the Hall effect conversion, the corresponding current value under each range of the multi-range Hall current sensor and the current value measured by the Hall current sensor are obtained, and the converted Hall current sensor The measured current value is used as the reference current value. Through the current value comparison device, the current value closest to the reference current value is selected as the current value obtained by measuring the current to be measured. If the current to be measured is measured by the Hall current sensor, the current to be measured only passes through the The Hall current sensor directly measures the voltage value and converts it to obtain the current value. By selecting one of the ranges of the multi-range Hall current sensor and measuring the voltage value corresponding to the current to be measured, and then converting the current value corresponding to the other ranges if the multi-range Hall current sensor is connected to other ranges, the The corresponding current value in each range of the multi-range Hall current sensor is converted and compared with the reference current value, and the most accurate current value in the appropriate range is selected as the measurement result without plugging and unplugging switching between ranges. Make current measurement more intelligent.

Description of drawings

1 is a device connection diagram of one embodiment of the current measuring device and method of the present invention;

2 is a parallel connection diagram of an embodiment of the inner coil of the Hall current sensor and the inner coil of the multi-range Hall current sensor of the current measuring device and method of the present invention;

FIG. 3 is a method flow chart of one embodiment of the current measuring device and method of the present invention.

Detailed ways

The Hall sensor increases the input turns ratio in the input circuit, which can improve the sampling accuracy of the output current. Therefore, different ranges can be obtained when winding different turns in the input loop of a Hall sensor. It can be seen that the more coil turns are wound in the Hall sensor input circuit with a certain specification, the smaller the corresponding measuring range of the Hall sensor is, and the more accurate it is at the same time. The current to be measured is sensed by the Hall current sensor through the coil, and the corresponding output is a voltage value corresponding to the measured current, which can be converted into the measured current value of the current to be measured according to the Hall effect.

As shown in FIG. 1 , a current measurement device includes a Hall current sensor 110, a multi-range Hall current sensor 120, a current conversion device 130 and a current value comparison device 140;

The range of the Hall current sensor 110 is the maximum range of the current measuring device, and the current to be measured is converted into a voltage by the Hall current sensor 110; the Hall current sensor 110 in this embodiment is specific according to the current to be measured The measurement situation is selected, and the range that the Hall current sensor 110 can detect is the maximum range of the current measuring device, ensuring that the current to be measured will not exceed the range through the Hall current sensor 110, so that the Hall current sensor 110 The measured current value is used as the reference current value.

The multi-range Hall current sensor 120 includes two or more ranges, the current to be measured is converted into a corresponding voltage by the corresponding range in the multi-range Hall current sensor 120, and the multi-range Hall current sensor 120 The inner coil is connected in parallel with the inner coil of the Hall current sensor 110. When using any range in the multi-range Hall current sensor 120 to measure the current to be measured, the current to be measured passes through the Hall current sensor 110. If the current to be measured The Hall current sensor 110 is selected for current measurement, and the current to be measured only passes through the Hall current sensor 110 . The range of the multi-range Hall current sensor 120 is determined by the number of turns of the coil wound on the sensor. In this embodiment, two or more coils with different numbers of turns are wound on the multi-range Hall current sensor 120, and the coils are separated from each other without being affected, forming a multi-range of two or more different ranges Hall current sensor 120 . As shown in Figure 2, taking two multi-range Hall current sensors with a range of 10A and 2A as an example, the coils in the multi-range Hall current sensor are connected in parallel with the coils of the Hall current sensor to ensure that the current to be measured is connected When measuring any range in the multi-range Hall current sensor, the current to be measured must pass through the Hall current sensor, that is, when the current to be measured is connected to any range in the multi-range Hall current sensor for measurement, the multi-range Hall current sensor can be measured One of the current to be measured is connected to measure the transmitted voltage value under the measurement range and the Hall current sensor measures the transmitted voltage value.

The current conversion device 130 converts the magnitude of the voltage into a current value according to the Hall effect, and the Hall current sensor 110 converts the magnitude of the voltage converted into a current value as a reference current value. If the current to be measured is connected to the The Hall current sensor 110 performs the measurement to obtain the voltage corresponding to the current to be measured, and directly converts the current value of the current to be measured according to the Hall effect. If any range in the multi-range Hall current sensor 120 is used to measure the current measurement, the current conversion device 130 also converts the current value when each range of the multi-range Hall current sensor 120 passes the current to be measured according to the magnitude of the voltage output by the multi-range Hall current sensor 120; The voltage value corresponding to the current to be measured is measured by the Hall current sensor 110 and the multi-range Hall current sensor 120, and then converted into a corresponding current value through the Hall effect, and the current to be measured is connected to the multi-range Hall current sensor 120 The range obtains the output voltage value corresponding to the access range, and through the Hall effect and the number of turns of the coil wound by the multi-range Hall current sensor 120 in other ranges, the current value obtained by connecting the current to be measured to other ranges can be converted correspondingly.

The current value comparison device 140 compares the current value of the current to be measured passing through each range in the multi-range Hall current sensor 120 converted by the current conversion device 130 with the reference current value, and selects the most The current value close to the reference current value is taken as the measured current value; the reference current value is the current value of the current to be measured detected by the maximum range, and each range in the multi-range Hall current sensor 120 is smaller than that of the Hall sensor. range, and the current value detected by a relatively small range must be more accurate than the current value detected by a relatively large range. Therefore, the corresponding current values of each range in the multi-range Hall current sensor 120 are converted and compared with the reference The current values are compared, and the corresponding current value closest to the reference current value is taken as the finally detected current value.

A current measurement method, comprising the steps of:

Step S210, pre-setting the range of the Hall current sensor and the multi-range Hall current sensor, and setting the range of the Hall current sensor to the maximum range, and the multi-range Hall current sensor has two or more ranges , connecting the inner coil of the multi-range Hall current sensor in parallel with the inner coil of the Hall current sensor, and connecting any range to measure the current to be measured. In this embodiment, the range of the Hall current sensor and the multi-range Hall current sensor is selected according to the specific measurement situation. The range that the Hall current sensor can detect is the maximum range of the current measuring device, ensuring that the current to be measured passes through The Hall current sensor will not exceed the range during the process of measuring the current to be measured, so that the current value measured by the Hall current sensor can be used as a reference current value. In this embodiment, two or more coils with different numbers of turns are wound on the multi-range Hall current sensor, and the separation between the coils is not affected, forming two or more multi-range Hall current sensors with different ranges. For a Hall current sensor, the inner coil of the multi-range Hall current sensor is connected in parallel with the inner coil of the Hall current sensor. When connecting any range of the multi-range Hall current sensor for measurement, the current to be measured passes through the multi-range Hall current sensor while also passing through the Hall current sensor. If the Hall current sensor is connected for measurement, The current to be measured only passes through the Hall current sensor.

Step S220, if the current to be measured is connected to the Hall current sensor for measurement, the voltage corresponding to the current to be measured is obtained, and the current value of the current to be measured is directly converted according to the Hall effect; if the current to be measured is connected to the multi-range If the Hall current sensor is measured in any range, the corresponding voltage value of the current to be measured connected to any range of the multi-range Hall current sensor for measurement and the voltage value when the current to be measured passes through the Hall current sensor are obtained.

In step S230, the current value of the current to be measured passing through the Hall current sensor and the current value of the range connected to the multi-range Hall current sensor are converted according to the Hall effect, and the converted Hall The current value measured by the current sensor is used as a reference current value, and the voltage value obtained by connecting the current to be measured to any range of the multi-range Hall current sensor is converted into the value of the current to be measured passing through each range in the multi-range Hall current sensor current value. The voltage value corresponding to the current to be measured is measured by the Hall current sensor and the multi-range Hall current sensor, and then converted into the corresponding current value through the Hall effect, and the current to be measured is connected to any range of the multi-range Hall current sensor The output voltage value corresponding to the access range is obtained, and the current value obtained by connecting the current to be measured to other ranges can be converted correspondingly through the Hall effect and the number of coil turns wound by other ranges of the multi-range Hall current sensor.

Step S240, comparing the converted current value of the current to be measured passing through each range in the multi-range Hall current sensor with the reference current value, and selecting the current value closest to the reference current value as the measurement obtained current value. If the current to be measured is connected to any range of the multi-range Hall current sensor for measurement, the current value of each range of the multi-range Hall current sensor corresponding to the current to be measured can be obtained by converting the current to be measured into the multi-range Hall current sensor. The current value of the current to be measured in one range of the current sensor can be converted to obtain the current value of the current to be measured in each range. Then, the current value obtained through conversion is compared with the reference current value, and the current value closest to the reference current value is the measured value of the current to be measured in a suitable range. If the current to be measured is connected to the range Hall current sensor for measurement, the converted value of the current to be measured under the range of the Hall current sensor is used as the measured value of the current to be measured under a suitable range.

The above-mentioned current measurement device and method are connected in parallel with the inner coil of the Hall current sensor by the multi-range Hall current sensor, so that when the current to be measured is selected from any range in the multi-range Hall current sensor for measurement, the to-be-measured current through the Hall current sensor. If the current to be measured is connected to any range of the multi-range Hall current sensor for measurement, then the measured current is connected to any range of the multi-range Hall current sensor to measure the voltage value and the current to be measured passes through the Hall current. The voltage value of the sensor, and then according to the Hall effect conversion, the corresponding current value under each range of the multi-range Hall current sensor and the current value measured by the Hall current sensor are obtained, and the converted Hall current sensor The measured current value is used as the reference current value. Through the current value comparison device, the current value closest to the reference current value is selected as the current value obtained by measuring the current to be measured. If the current to be measured is measured by the Hall current sensor, the current to be measured only passes through the The Hall current sensor directly measures the voltage value and converts it to obtain the current value. By selecting one of the ranges of the multi-range Hall current sensor and measuring the voltage value corresponding to the current to be measured, and then converting the current value corresponding to the other ranges if the multi-range Hall current sensor is connected to other ranges, the The corresponding current value in each range of the multi-range Hall current sensor is converted and compared with the reference current value, and the most accurate current value in the appropriate range is selected as the measurement result without plugging and unplugging switching between ranges. Make current measurement more intelligent.

In one of the embodiments, the current measuring device further includes an over-range judging device, and the over-range judging device is used for when the current value converted by the current conversion device exceeds the corresponding connection range, the over-range judgment The device determines that the current connection to be measured exceeds the range. The over-range judging device can instantly judge whether the current to be measured exceeds the measurement range of the multi-range sensor.

In one of the embodiments, the range of the Hall current sensor and two or more ranges of the multi-range Hall current sensor are sequentially decreased in a predetermined multiple relationship. The measuring range of the current measured by the Hall current sensor is 50A, and the predetermined multiple is preferably 5 times. For ease of understanding, the Hall current sensor and the multi-range Hall current sensor including two ranges are taken as examples for illustration. If the range of the Hall current sensor measuring current is 50A, the corresponding multi-range Hall current sensor The measuring ranges are 10A and 2A respectively. If the current to be measured is connected to the range of the Hall current sensor 50A for measurement, the Hall current sensor outputs a voltage value corresponding to the current to be measured, and the measured current value to be measured is converted by the current conversion device 130 . If you want to obtain a more accurate measured value of the current to be measured, the current to be measured is arbitrarily connected to the 10A range or 2A range of the multi-range Hall current sensor for measurement. If the current to be measured passes through the 10A range of the multi-range Hall current sensor , then the output voltage value when the current to be measured passes through the 10A range of the multi-range Hall current sensor is obtained. Through this voltage value, the converted current value of the current to be measured connected to the 2A range is calculated according to the Hall effect, and converted into The corresponding current value, for example, when the current to be measured is 5A, the Hall current sensor correspondingly measures a value of about 5A, and the measured value obtained by the multi-range Hall current sensor under 10 ranges is about 5A, while Since the measured value in the 2A range exceeds the measurement range of the 2A range by 5A, the current calculation device calculates that the measured current value measured in the 2A range is about 25A according to the Hall effect, and the multi-range Hall current sensor corresponds to each range The current value is compared with the reference current value, and the current value measured in the 10A range closest to the reference current value is selected as the current value of the current to be measured. If the current to be measured is 1A, the corresponding measurement of the Hall current sensor obtains a value of about 1A, the measured value of the multi-range Hall current sensor is about 1A under the 10 range, and the measured value under the 2A range About 1A, since the measurement accuracy of the 2A range is higher than that of the 10A range, the multi-range Hall current sensor compares the current value corresponding to each range with the reference current value, and selects the closest to the reference current value The current value measured under the 2A range of the value is taken as the current value of the current to be measured.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a current measuring device is characterized in that, comprises Hall current sensor, multirange Hall current sensor, electric current scaler and current value comparison device;

The range of described Hall current sensor is the maximum range of described current measuring device, and electric current to be measured converts voltage to by described Hall current sensor;

Described multirange Hall current sensor comprises two or more ranges, electric current to be measured converts corresponding voltage to by the corresponding range in the described multirange Hall current sensor, described multirange Hall current sensor interior loop and described Hall current sensor interior loop are connected in parallel, use in the described multirange Hall current sensor arbitrarily range to treat to survey electric current when measuring, electric current to be measured is by described Hall current sensor, if electric current to be measured is measured by described Hall current sensor, then electric current to be measured only passes through described Hall current sensor;

Described electric current scaler is converted into current value according to Hall effect with the size of described voltage, described Hall current sensor converts current value that the size of voltage is converted into to as reference current value, if connecting described Hall current sensor, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, if using in the described multirange Hall current sensor arbitrarily range to treat to survey electric current measures, the current value of described each range of multirange Hall current sensor of large young pathbreaker that described electric current scaler is also exported described voltage according to described multirange Hall current sensor during by electric current to be measured converts out;

Described current value comparison device is compared described electric current scaler described each range of multirange Hall current sensor of obtaining current value and described reference current value during by electric current to be measured that convert, the current value of selecting the current value conduct near described reference current value to measure.

2. current measuring device according to claim 1, it is characterized in that, also comprise the outrange judgment means, when described outrange judgment means exceeded corresponding connection range for the current value that converts out when the electric current scaler, described outrange judgment means judged that electric current to be measured connects outrange.

3. automatic range switching current measurement mechanism according to claim 1 and 2 is characterized in that, two or more ranges in the range of described Hall current sensor and the described multirange Hall current sensor successively decrease successively with the prearranged multiple relation.

4. automatic range switching current measurement mechanism according to claim 1 and 2 is characterized in that, the range that described Hall current sensor is measured electric current is 50A.

5. automatic range switching current measurement mechanism according to claim 3 is characterized in that, described prearranged multiple is 5 times.

6. a current measuring method is characterized in that, comprises step:

Preset the range of Hall current sensor and multirange Hall current sensor, and to set described Hall current sensor range be maximum range, described multirange Hall current sensor has two or more ranges, described multirange Hall current sensor interior loop and described Hall current sensor interior loop are connected in parallel, connect any range and treat and survey electric current and measure;

If connecting described Hall current sensor, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, any range is measured if electric current to be measured connects described multirange Hall current sensor, the magnitude of voltage when then obtaining electric current to be measured and connecting corresponding voltage value that any range of described multirange Hall current sensor measures and electric current to be measured through described Hall current sensor;

According to the convert current value of the current value draw the electric current to be measured by described Hall current sensor and the range by described multirange Hall current sensor connection of Hall effect, the current value that the described Hall current sensor that conversion is drawn is measured is as reference current value, and connects the current value that magnitude of voltage that any range of described multirange Hall current sensor obtains converses the electric current to be measured that each range passes through in the described multirange Hall current sensor according to electric current to be measured;

Current value and the described reference current value of the electric current to be measured that each range passes through in the described multirange Hall current sensor that conversion is drawn are compared, and select current value near described reference current value as the current value that measures.

7. current measuring method according to claim 6, it is characterized in that, when described corresponding current value and described reference current value are compared, also comprise step: when the current value that converts out when the electric current scaler exceeded corresponding connection range, described outrange judgment means judged that electric current to be measured connects outrange.

8. according to claim 6 or 7 described current measuring methods, it is characterized in that range and two or more ranges in the described multirange Hall current sensor of setting described Hall current sensor successively decrease successively with the prearranged multiple relation.

9. according to claim 6 or 7 described current measuring methods, it is characterized in that it is 50A that the maximum of determining to measure electric current is measured range.

10. current measuring method according to claim 8 is characterized in that, determines that described prearranged multiple is 5 times.

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