CN204330933U - A kind of detection of electrical leakage warning circuit - Google Patents

Abstract

A kind of detection of electrical leakage warning circuit of the utility model, belongs to the technical field of detection of electrical leakage; Technical matters to be solved is: provide a kind of and can detect consumer electric leakage and can a kind of detection of electrical leakage warning circuit of alarm; The technical scheme adopted is: a kind of detection of electrical leakage warning circuit, comprise rectification circuit Q1, time-base integrated circuit chip IC 1 and loudspeaker BL1, be connected with signals collecting end a1 after the forward ac input end series resistor R1 of described rectification circuit Q1, the negative sense ac input end of described rectification circuit Q1 is connected with signals collecting end a2, electric leakage information can be measured fast and accurately, when consumer leaks electricity, give the alarm; The utility model is applicable to the field of detection of electrical leakage.

Description

A leakage detection and alarm circuit

technical field

The utility model relates to an electric leakage detection and alarm circuit, which belongs to the technical field of electric leakage detection.

Background technique

With the development of social economy and the improvement of people's living standards, the popularization of household equipment such as refrigerators, TV sets, and air conditioners has brought a lot of convenience to people's lives. Aging of equipment, improper use of electrical appliances and other reasons may lead to electrical equipment leakage, which will bring harm to people's property and life safety. For example, sparks generated by electrical equipment leakage may cause fire, explosion, and electric shock. Therefore, the leakage detection of electrical equipment is particularly important.

Utility model content

The utility model overcomes the deficiencies in the prior art, and the technical problem to be solved is: to provide a leakage detection and alarm circuit capable of detecting the leakage of electrical equipment and giving an alarm prompt.

In order to solve the above technical problems, the technical solution adopted by the utility model is:

A leakage detection and alarm circuit, comprising a rectification circuit Q1, a time-base integrated circuit chip IC1 and a speaker BL1, the positive AC input end of the rectification circuit Q1 is connected in series with a resistor R1 and connected to the signal acquisition end a1, and the rectification circuit Q1 The negative AC input terminal of the rectifier circuit Q1 is connected to the signal acquisition terminal a2, the positive DC output terminal of the rectifier circuit Q1 is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected to the positive pole of the capacitor C1 in parallel with the thyristor D2. The control terminal is connected, the anode of the thyristor D2 is connected to the power supply end of the time base integrated circuit chip IC1 in parallel, and then connected to the power supply VCC, the negative pole of the thyristor D2 is connected to a fixed end of the adjustable resistor R2, The active end of the adjustable resistor R2 is connected to the reset end of the time base integrated circuit chip IC1, and the trigger end of the time base integrated circuit chip IC1 is connected in parallel with the positive pole of the capacitor C2 and one end of the resistor R3, and then connected to the The reset lock terminal of the time base integrated circuit chip IC1 is connected, the other end of the resistor R3 is connected to the output terminal of the time base integrated circuit chip IC1 after being connected to the positive pole of the capacitor C3 in parallel, and the negative pole of the capacitor C3 is connected to the The positive pole of the speaker BL1 is connected, the negative pole of the speaker BL1, the ground terminal of the time base integrated circuit chip IC1, the negative pole of the capacitor C2, the other fixed end of the adjustable resistor R2, and the negative pole of the capacitor C1 and the negative DC output terminals of the rectifier circuit Q1 are both grounded.

The time base integrated circuit chip IC1 is a NE555 chip, and pin 1 of the NE555 chip is a ground terminal, pin 2 is a trigger terminal, pin 3 is an output terminal, pin 4 is a reset terminal, pin 6 is a reset lock terminal, Pin 8 is a power supply terminal; the power supply VCC is a +6V power supply.

Compared with the prior art, the utility model has the following beneficial effects:

A leakage detection and alarm circuit in the utility model can be directly connected with the shell or the ground wire of the electrical equipment. When the signal acquisition terminals a1 and a2 have no signal input, the thyristor D2 is cut off, and its output voltage is less than 0.7V. The reset terminal of the time-base integrated circuit chip IC1 is forcibly reset, the whole circuit is in a non-working state, and the speaker BL1 does not make a sound; when the signal acquisition terminals a1 and a2 have current signal input, the thyristor D2 is turned on, and the time-base integration The reset end of the circuit chip IC1 becomes high level, the whole circuit starts to vibrate, and the speaker BL1 sends out an alarm sound to remind people to take measures to prevent accidents. The utility model can quickly and accurately measure leakage information, and can issue an alarm , the whole circuit structure is simple and practical.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail;

Fig. 1 is a schematic circuit diagram of a leakage detection and alarm circuit of the present invention.

Detailed ways

As shown in Figure 1, a leakage detection and alarm circuit includes a rectification circuit Q1, a time-base integrated circuit chip IC1 and a speaker BL1, the forward AC input end of the rectification circuit Q1 is connected in series with a resistor R1 and then connected to the signal acquisition end a1 , the negative AC input terminal of the rectifier circuit Q1 is connected to the signal acquisition terminal a2, the positive DC output terminal of the rectifier circuit Q1 is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected in parallel with the positive pole of the capacitor C1 It is connected with the control terminal of the thyristor D2, and the anode of the thyristor D2 is connected to the power supply end of the time-base integrated circuit chip IC1 in parallel, and then connected to the power supply VCC, and the negative pole of the thyristor D2 is connected to the adjustable resistor R2 connected to a fixed end of the adjustable resistor R2, the movable end of the adjustable resistor R2 is connected to the reset end of the time base integrated circuit chip IC1, and the trigger end of the time base integrated circuit chip IC1 is connected in parallel to the positive pole of the capacitor C2 and the resistor R3 One end of the resistor R3 is connected to the reset lock terminal of the time base integrated circuit chip IC1, and the other end of the resistor R3 is connected to the positive pole of the capacitor C3 in parallel and then connected to the output end of the time base integrated circuit chip IC1. The negative pole of C3 is connected to the positive pole of the speaker BL1, the negative pole of the speaker BL1, the ground terminal of the time base integrated circuit chip IC1, the negative pole of the capacitor C2, the other fixed terminal of the adjustable resistor R2, Both the negative electrode of the capacitor C1 and the negative DC output end of the rectifier circuit Q1 are grounded.

In the utility model, the time-base integrated circuit chip IC1 is a NE555 chip, and pin 1 of the NE555 chip is a ground terminal, pin 2 is a trigger terminal, pin 3 is an output terminal, pin 4 is a reset terminal, and pin 6 is a The reset lock terminal and pin 8 are the power supply terminal; the power supply VCC is +6V power supply.

Specifically, after the utility model is connected to the shell or the ground wire of the electrical equipment, when there is no signal input from the signal acquisition terminals a1 and a2, the thyristor D2 is cut off, and its output voltage is less than 0.7V, and the time-based integrated circuit chip IC1 The reset terminal is forcibly reset, the whole circuit is in a non-working state, and the speaker BL1 does not make a sound; when the signal acquisition terminals a1 and a2 have current signal input, the thyristor D2 conducts, and the reset terminal of the time-base integrated circuit chip IC1 When it becomes high level, the whole circuit starts to vibrate, and the speaker BL1 sends out an alarm sound to remind people to take measures to prevent accidents.

A leakage detection and alarm circuit in this embodiment includes a rectifier circuit Q1, a time-based integrated circuit chip IC1 and a speaker BL1, which can be directly connected to the shell or the ground wire of the electrical equipment, and can quickly and accurately measure the leakage information, and can Alarm, the whole circuit structure is simple, with prominent substantive features and significant progress, the above embodiments of the utility model have been described in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiments, and the ordinary technology in the art Within the scope of knowledge that personnel possess, various changes can also be made under the premise of not departing from the utility model purpose.

Claims (3)

1. A leakage detection and alarm circuit is characterized in that: it comprises a rectifier circuit Q1, a time-base integrated circuit chip IC1 and a loudspeaker BL1, and the forward AC input terminal of the rectifier circuit Q1 is connected in series with a resistor R1 after being connected with the signal acquisition terminal a1 , the negative AC input terminal of the rectifier circuit Q1 is connected to the signal acquisition terminal a2, the positive DC output terminal of the rectifier circuit Q1 is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected in parallel with the positive pole of the capacitor C1 It is connected with the control terminal of the thyristor D2, and the anode of the thyristor D2 is connected to the power supply end of the time-base integrated circuit chip IC1 in parallel, and then connected to the power supply VCC, and the negative pole of the thyristor D2 is connected to the adjustable resistor R2 connected to a fixed end of the adjustable resistor R2, the movable end of the adjustable resistor R2 is connected to the reset end of the time base integrated circuit chip IC1, and the trigger end of the time base integrated circuit chip IC1 is connected in parallel to the positive pole of the capacitor C2 and the resistor R3 One end of the resistor R3 is connected to the reset lock terminal of the time base integrated circuit chip IC1, and the other end of the resistor R3 is connected to the positive pole of the capacitor C3 in parallel and connected to the output end of the time base integrated circuit chip IC1. The negative pole of C3 is connected to the positive pole of the speaker BL1, the negative pole of the speaker BL1, the ground terminal of the time base integrated circuit chip IC1, the negative pole of the capacitor C2, the other fixed terminal of the adjustable resistor R2, Both the negative electrode of the capacitor C1 and the negative DC output end of the rectifier circuit Q1 are grounded. 2. A kind of electric leakage detection alarm circuit according to claim 1, is characterized in that: described time base integrated circuit chip IC1 is NE555 chip, and pin 1 of described NE555 chip is ground terminal, pin 2 is trigger terminal, pin 3 is Pin is the output terminal, pin 4 is the reset terminal, pin 6 is the reset lock terminal, and pin 8 is the power supply terminal. 3. A leakage detection and alarm circuit according to claim 1, characterized in that: said power supply VCC is a +6V power supply.