JPH06168038A - Power supply - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] Regarding a power supply device, in a device having an analog circuit driven by a battery, it is possible to efficiently and accurately drive the analog circuit by switching between two types of voltage regulators. To aim. [Structure] Analog system circuit with battery as uncontrolled supply source
In the device having (6), the power conversion efficiency is inferior to the first regulator (41) for converting the battery voltage into a predetermined voltage and the second regulator excellent in the voltage fluctuation rate.
Regulator (42), switching unit (43), power supply control unit (40)
And the switching unit switches and outputs the output of the first regulator and the output of the second regulator, and the power supply control unit controls the switching unit to output the output of the first regulator to the analog circuit. And the second regulator is switched to the first regulator and supplied to the analog system circuit at least after the warm-up time of the analog system circuit has elapsed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a power supply device in a device having an analog circuit for driving a battery.

2. Description of the Related Art A measuring device that uses a battery, a solar cell, or the like to measure outdoors is required to have low power consumption, and its power supply is also required to have high efficiency. However, in a device having a highly accurate analog system circuit that handles a minute signal, a power source with small voltage fluctuation and low noise is required.
Such a power source is usually inefficient, and thus a power supply device that satisfies both of them is required.

[0003]

2. Description of the Related Art FIG. 4 is a configuration diagram of a conventional example, and FIG. 5 is a time chart diagram of the conventional example. FIG. 4 shows an example of one measuring device in a measuring system in which a plurality of measuring devices are arranged in a wide area and outdoors and are connected to the center by a line. This measuring device is configured to measure the vibration of the crust by, for example, a vibration sensor, and includes a digital system circuit 5 including a microprocessor unit MPU7, a memory and the like, and an analog signal (vibration inputted from the outside). An analog circuit 6 such as an ADC for AD-converting a signal from the sensor). Then, the vibration data collected by each measuring device is transferred to the center by the line.

This measuring device is constructed so as to be driven by a battery 3 so that it can be installed in any place outdoors, and the power consumption of the device is reduced because the power consumption of the device is reduced and a small signal called crustal vibration is handled. Stability and low noise are required as much as possible.

In FIG. 4, a switching regulator 1 switches a voltage supplied from a battery 3 to convert it into an alternating current, and converts this alternating current into a predetermined output voltage VCCD by a transformer (not shown). Since it can supply (for example, 5 V), it is used as a power supply for the digital circuit 5.

On the other hand, since the analog circuit 6 handles a small signal as described above, it needs a power source with low noise and low voltage fluctuation, and is lower in efficiency than the switching regulator 1, but has small ripple and switching. From the series regulator 2 that does not generate noise to VCCA (5
V) is being supplied. The series regulator 2 is of a type in which a series transistor is inserted between the battery 3 and the load, and the transistor absorbs the fluctuation voltage. Therefore, the difference between the battery voltage and VCCA causes a loss, resulting in low efficiency.

Since the present measurement system is to generate crustal vibration at a certain point and measure how it is transmitted, it measures crustal movement within a limited time. Therefore, the battery 3
In order to reduce the consumption of, the series regulator 2 is controlled to be turned on only at the time of measurement.

FIG. 5 shows the pattern of this control. Each measuring device is arranged at a predetermined position, and with a takeout cable that has a signal line between the vibration sensor and the core,
A measuring system is formed by connecting the measuring devices and the center.

When the installation is completed, first, the battery 3 is connected to the measuring device. This gives a signal VSBY indicating battery connection.
Is turned on, and this is used as a trigger to turn on the switching regulator 1 to output VCCD (5V). As a result, the digital system circuit 5 is supplied with the voltage VCCD and becomes in the operating state.

When starting the measurement, the operator at the center issues a VCCA ON command to each measuring device. Upon receiving this command, the MPU 7 of each measuring device uses the power control unit 4
The VCCA ON command is output to and the power supply control unit 4 turns on the series regulator 2. As a result, the voltage VCCA is supplied to the analog system circuit 6, and the analog system circuit 6 enters the measurement operation standby state.

Then, at the center, the operator inputs a measurement command instructing the measurement period t1. As shown in FIG. 5, this command is issued to each measuring device after the time until the temperature of each element of the analog circuit 6 is stabilized, that is, after a predetermined warm-up time t0. After the second measurement, the command is issued immediately unless VCCA is turned off.

In the measuring device which receives this command, the analog signal input within the measuring period t1 is A / D converted and then stored in a memory (not shown). When the collecting command is output from the center, the MPU 7 takes out the collected data from the memory and transfers it to the center.
Needless to say, the crustal vibration is generated by igniting the explosive at the time when the measurement is started.

[0013]

Since the switching regulator 1 has a high efficiency, it is preferable as a power supply device for a battery-driven device, but it has a large ripple and a relatively low voltage stability. In addition, switching noise is dissipated to affect minute signals. On the other hand, when the battery 3 is used as the non-controlled supply source, the series regulator 2 has very little noise and ripple, and has high voltage stability against load fluctuation, but switching occurs because the series transistor causes loss. Less efficient than regulator 1. Therefore, as described in the conventional example, the switching regulator 1 is used as the power source of the digital circuit 5 and the series regulator 2 is used as the power source of the analog circuit 6, and the series regulator 2 is used at the start of measurement. However, since the warm-up time for the analog element to operate stably requires several minutes, there is a problem that battery consumption cannot be ignored during this period. Also, despite the occurrence of crustal deformation, if the series regulator fails at that point and measurement is not possible, a huge loss occurs, and since it is distributed, it takes time to repair.

In view of the above problems, it is an object of the present invention to provide an efficient and reliable power supply device having a battery-driven analog circuit.

[0015]

In the principle diagram of the present invention shown in FIG. 1, 6 is an analog circuit. Reference numeral 41 is a high-efficiency first regulator like a switching regulator, which regulates and stabilizes the battery voltage to a predetermined voltage. A second regulator 42, such as a series regulator, regulates the battery voltage to a predetermined voltage and stabilizes it. At this time, as compared with the first regulator 41, the voltage conversion efficiency is inferior, but the voltage fluctuation rate is excellent. A switching unit 43 switches between the output of the first regulator 41 and the output of the second regulator 42 and outputs the output. Reference numeral 40 denotes a power supply control unit that controls the switching unit 43 to supply the output of the first regulator 41 to the analog system circuit 6 and at least after a predetermined warm-up time required for the analog system circuit 6 has elapsed. The power supplied to the switch is switched from the output of the first regulator 41 to the output of the second regulator 42.

In the above power supply device, the second
Means for monitoring the output of the regulator 42 is provided, and when the abnormality of the second regulator 42 is detected, the switching from the first regulator 41 to the second regulator 42 is stopped.

[0017]

Operation: The power supply control unit 40 first controls the switching unit 43,
The output of the first regulator 41 is supplied to the analog circuit 6. Then, at least after a predetermined warm-up time required for the analog system circuit 6 has passed, the first regulator
Switch the output of 41 to the output of the second regulator 42,
The analog circuit 6 is supplied.

As described above, since the analog circuit 6 is warmed up by the first regulator 41 and then switched to the second regulator to operate the analog circuit 6, stability is maintained and efficiency is improved as in the conventional case. Will improve.

In the above power supply device, means for monitoring the output of the second regulator 41 is provided, and when the abnormality of the second regulator 42 is detected, switching from the first regulator to the second regulator is stopped. To do. When switching from the first regulator 41 to the second regulator 42, first, the output of the second regulator 42 is turned on, and then the first regulator 41 is turned off. Therefore, the second regulator 41 can operate the analog system circuit 6.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a block diagram of an embodiment, and FIG. 3 is an operation time chart. In this embodiment, an example applied to the conventional example shown in FIG. 4 is shown. That is, the first regulator 41 is a switching regulator and the second regulator 42 is a series regulator. Further, an example is shown in which the output of the series regulator is monitored at the same time, and if the output is not output in response to the command, the output of the switching regulator is directly supplied and measured.

In FIG. 2, reference numeral 10 denotes an input protection circuit, which discharges when an excessive voltage is input, such as an arrester, and blocks the input of the excessive voltage. A filter 11 filters an analog signal input through the input protection circuit 10. 13 is an analog-digital converter ADC
At 13, the analog signal passed through the filter 11 is converted into digital data. This converted digital data is
It is read by the microprocessor MPU21 and stored in the memory 22. A test unit 12 converts the digital data written by the MPU 21 into an analog signal and inputs the analog signal to the filter 11. As a result, the MPU 21 compares the data written in the test section 12 with the data read from the ADC 13 to test the analog circuit 6.

A memory 22 stores a program for the MPU 21 to perform measurement control and power supply control, collected data digitally converted by the ADC 13, and the like. A digital signal processor DSP 23 performs predetermined signal processing such as encoding / restoring on a series of data stored in the memory 22. A line control unit 24 communicates with a center (not shown). 21 is a microprocessor MPU
Then, the above-mentioned respective units are controlled to perform data collection control and power supply control described later. All the above are bus 10
Data is exchanged by being interconnected via 0.

In the above configuration, the filter 11, the test section 12, and the ADC 13 are each composed of an analog system circuit 6 and a digital system circuit for exchanging data with the MPU 13, as surrounded by a dotted line in the figure. The digital system circuit, the MPU 21, the memory 22, the DSP 23, and the line control unit 24 constitute the digital system circuit 5. A voltage supply line (including a ground line, but the ground line is connected at a predetermined point) is divided between the analog system circuit 6 and the digital system circuit 5.

The following is the configuration of the power supply circuit. Reference numeral 30 denotes a series regulator for small power, which is not shown in the figure, using the battery 3 as a non-control supply source, but feeds back the output voltage VCCA in a divided manner and outputs a stabilized voltage VCCA by current amplification by the transistor 33.

Reference numeral 31 is a switching regulator for small electric power, which switches the output voltage of the battery 3 and outputs the voltage VCCD (A) by a transformer (not shown). This VCCD (A)
Is amplified by the transistor 37 and supplied to the analog circuit 6 through the diode 35 during the warm-up time.

Reference numeral 32 is a switching regulator having the same structure as the switching regulator 31. The current is amplified by the transistor 38 and supplied to the digital circuit 5.
The output voltages VCCD (A) and VCCD are fed back to the switching regulators 31 and 32 in a divided manner, and are stabilized together with the voltage setting by switching pulse width control or the like. In addition, series regulator 30,
The switching regulators 31 and 32 are integrated together.

Reference numeral 40 denotes a power supply control unit which controls the series regulator 30 and the switching regulators 31 and 32 to be turned on and off by controlling the MPU 21 according to a command from the center. 36 is a D TYPE flip-flop (D-FF)
Then, when the series regulator 30 is turned on, VCCA
Store the output (5V). That is, when the Q output (voltage check status bit) of D-FF 36 is "1", MPU21
Thus, it is determined that the series regulator 30 has been normally turned on.

In the above structure, the following power supply control is performed. See FIG. 3. The battery 3 is connected to the measurement device. This allows VS
BY is turned on, the series regulator 32 is turned on, and VCCD is output. As a result, the digital circuit 5 is put into operation. When the preparation for measurement is completed, the center issues a VCCA ON command, and the MPU21 of each measuring device that receives this command.
Instructs the power supply control unit 40 to turn on VCCD (A). As a result, the power supply control unit 40 turns on the switching regulator 31. As a result, VCCD (A) is output via the diode 35, and VCCD (A) is supplied to the analog circuit 6. After the warm-up time t0 has elapsed, the center outputs a measurement command designating the measurement period t1. As a result, the MPU 21 commands the power supply controller 40 to perform VCCAON, and the power supply controller 40 turns on the series regulator 30. This allows the voltage from the series regulator 30
VCCA is output. The MPU21 monitors the voltage check status bit (Q output of D-FF) after a predetermined time, and if it is "1", VCCA is output, so VCCD (A)
Instructs the power control unit 4 to turn OFF. This allows VCCD (A)
Is turned off. As a result, the analog circuit 6 is supplied with VCCA, which is the output of the series regulator 30. If the voltage status bit is "0", OFD of VCCD (A)
F command is not issued. In other words, the analog circuit 6 remains in the state in which VCCD (A), which is the output of the switching regulator 31, is being supplied. The MPU 21 takes in an analog signal after a predetermined time (when VCCD (A) is turned on) after monitoring the voltage check status bit. After the specified measurement time has elapsed, the acquisition of analog signals is stopped.

Note that the same processing as in (1) to (3) is performed during the second and subsequent measurements. When the measurement is completed, the battery 3 is disconnected, and the disconnection triggers the series regulator 32 to turn off VCCD.

As described above, the analog system circuit 6 is supplied and warmed up by the switching regulator 31 from the VCCA ON command to at least the warm-up time. During that time, power is not supplied from the series regulator 30, so that the efficiency is improved. At the time of measurement,
As in the conventional example, since the series regulator 30 is switched to, stable measurement can be performed.

In the above embodiment, the switching regulator 31 for supplying VCCD (A) to the analog system circuit 6 is provided separately from the switching regulator 32 for supplying VCCD to the digital system circuit 5, but VCCD (A ) And VCCD have the same voltage, VCCD (A) may be supplied from VCCD. In this case, power may be supplied from the power supply control circuit 40 through a switch circuit that can be turned on and off.

[0032]

As described above, according to the present invention, in an apparatus having an analog circuit using a battery as a non-control supply source, the analog circuit is driven through a switching regulator at least during the warm-up time, and the analog circuit is driven. It provides a power supply device configured to be driven by a series regulator at the time of operating a system circuit. Since efficiency is achieved without impairing the quality of the power supply,
In particular, when the battery is used as the non-controlled supply source, it is possible to reduce the consumption of the battery.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment.

[Fig. 3] Operation time chart

FIG. 4 is a block diagram of a conventional example

FIG. 5 is a time chart diagram of a conventional example.

[Explanation of symbols]

1 Switching regulator 2 Series regulator 3 Battery 4 Power supply control unit 5 Digital system circuit 6 Analog system circuit 7 Microprocessor unit MPU 10 Input protection circuit 11 Filter 12 Test unit 13 Analog-digital converter ADC 21 Microprocessor unit MPU 22 Memory 23 Digital signal Processor DSP 24 Line control unit 30 Series regulator 31 Switching regulator 32 Switching regulator 33 Transistor 34, 35 Diode 36 D TYPE
Flip-flop 37,38 Transistor 40 Power supply control unit 41 First regulator 42 Second regulator 43 Switching unit 100 Bus

Claims (2)

[Claims] 1. A power supply device in a device having a battery-driven analog system circuit (6), wherein a first regulator (41) and a first regulator (41) for respectively converting a battery voltage into a predetermined voltage and stabilizing it. The second regulator (42), which has lower power conversion efficiency than the regulator but excellent voltage fluctuation rate
A switching unit (43) and a power supply control unit (40), and the switching unit (43) outputs the output of the first regulator (41) and the second regulator (41).
One of the outputs of the regulator (42) is supplied as a power source of the analog circuit, and the power supply control section (40) controls the switching section to control the first regulator. Is supplied to the analog system circuit, and at least at a predetermined time point after the predetermined warm-up time required for the analog system circuit is reached, power is supplied to the analog system circuit from the output of the first regulator to the second power supply. A power supply device characterized by being switched to the output of a regulator. 2. A monitoring means for monitoring the output of the second regulator is provided, and when the monitoring means detects an abnormality in the output of the second regulator, the first regulator is changed to the second regulator.
2. The power supply device according to claim 1, wherein the switching to the regulator is stopped.