CN212969036U - PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage - Google Patents

PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage Download PDF

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CN212969036U
CN212969036U CN202021747017.0U CN202021747017U CN212969036U CN 212969036 U CN212969036 U CN 212969036U CN 202021747017 U CN202021747017 U CN 202021747017U CN 212969036 U CN212969036 U CN 212969036U
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circuit
resistor
pulse width
pwm pulse
leakage
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CN202021747017.0U
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陆仲清
陈利文
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Guangdong Prostar New Energy Technology Co ltd
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Guangdong Prostar New Energy Technology Co ltd
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Abstract

The utility model discloses a PWM pulse width control rectification is to floor drain adjustable sensitivity warning circuit, wherein, the output of DC resistance bridge circuit is connected with a branch said sensitivity adjusting circuit input end, another branch is used for external machine case; the output end of the sensitivity adjusting circuit is connected with the input end of the full-bridge rectifying circuit; the output end of the full-bridge rectifying circuit is respectively connected with the input ends of the leakage indication circuit and the optical coupling isolating switch circuit; the analog leakage test circuit is directly connected with the DC resistance bridge, and the output end of the optical coupling isolating switch circuit is connected with the input ends of the multivibrator and the control circuit; the output end of the control circuit is connected with and controls the PWM pulse width control rectification drive circuit, and the output end of the multivibrator is connected with the input end of the electric leakage alarm circuit. The utility model discloses the circuit is simple, practical, reliable, low cost.

Description

PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage
Technical Field
The utility model relates to an electronic circuit field, concretely relates to PWM pulse width control rectification is to floor drain adjustable sensitivity alarm circuit.
Background
When the lead-acid battery is charged in the existing circuit system, the lead-acid battery can generate acid gas more or less and emit the acid gas for a long time, and the acid gas is accumulated in the battery shell for a long time, so that the direct current output can cause the electric leakage of a battery cabinet, and the life hazard is brought to operators.
The direct-current power feed cabinet has various reasons for the ground leakage, for example, the quality of an insulating layer of an input isolation transformer core is poor due to a primary winding and a secondary winding of the input isolation transformer, and the ground leakage can be protected for the life of an operator due to the fact that a ground leakage protection switch is added to the alternating-current input.
However, if the current leaks from the casing through the rectified output after being input into the isolation transformer, the method of adding the leakage protection switch to the alternating current input cannot protect the life of the operator, and thus the life of the operator is greatly affected. There is therefore a need for further improvements in the technology of this block.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a PWM pulse width control rectification that rectifier output carries out the warning to the casing electric leakage after the input isolation transformer can in time report to the police to earth leakage adjustable sensitivity alarm circuit, guarantees operating personnel's operation safety.
In order to achieve the purpose, the utility model adopts the following technical scheme: PWM pulse width control rectification is to adjustable sensitivity alarm circuit of earth leakage, including simulation electric leakage test circuit, DC resistance bridge, sensitivity regulating circuit, full-bridge rectifier circuit, electric leakage instruction, opto-coupler isolator circuit, multivibrator, electric leakage alarm circuit and control circuit, wherein:
the output end of the DC resistance bridge circuit is connected with the input end of the sensitivity adjusting circuit of one branch, and the other branch is externally connected with a case;
the output end of the sensitivity adjusting circuit is connected with the input end of the full-bridge rectifying circuit;
the output end of the full-bridge rectifying circuit is respectively connected with the input ends of the leakage indication circuit and the optical coupling isolating switch circuit;
the analog leakage test circuit is directly connected with the DC resistance bridge, and the output end of the optical coupling isolating switch circuit is connected with the input ends of the multivibrator and the control circuit;
the output end of the control circuit is connected with and controls the PWM pulse width control rectification drive circuit, and the output end of the multivibrator is connected with the input end of the electric leakage alarm circuit.
Preferably, the analog leakage test circuit comprises a test button S1 and a resistor R15;
the test button S1 and resistor R15 are connected in series.
Preferably, the DC resistance bridge comprises resistors R11, R12, R13, and R14;
the R11 is connected with a resistor R13 in series to form a first series branch; the resistor R12 is connected in series with the resistor R14 to form a second series branch, which is connected in parallel with the second series branch.
Preferably, the sensitivity adjusting circuit comprises an adjustable resistor W1, and two ends of the adjustable resistor W1 are respectively connected to a point a and a point B of an intermediate line break between two series resistors of the first series branch and the second series branch.
Preferably, the full-bridge rectifier circuit includes diodes D1, D2, D3 and D4;
the tail end of the D1 is connected and converged with the front end of the D2 and then is connected to a point B, and the front end of the D1 is connected and converged with the front end of the D3;
the tail end of the D3 is connected and converged with the front end of the D4 and then connected to the point A, and the front end of the D2 is connected and converged with the tail end of the D4.
Preferably, the leakage indicator comprises an LED1, the LED1 is connected in series with the junction of the front end of D1 and the front end of D3, and the other end is connected with the input end of the optical coupling isolating switch circuit.
Preferably, the optocoupler-isolation switch circuit comprises an optocoupler U1;
one end of two input ends of the optical coupler U1 is connected with an LED1, and the other end of the two input ends of the optical coupler U1 is connected with a connection junction point of the front end of the D2 and the tail end of the D4; the output end of the optical coupler U1 is connected with a control circuit.
Preferably, the multivibrator includes electrolytic capacitors C1, C2, a diode D5 and an operational amplifier U2;
the electrolytic capacitors C1 and C2 are respectively connected with the negative phase input end and the positive phase input end of the operational amplifier U2; the front end of the diode D5 is connected to the negative phase input end of the operational amplifier U2, and the tail end is connected to the output end of the operational amplifier U2.
The leakage alarm circuit comprises resistors R4 and R5, a triode Q1 and a buzzer BUZZ;
preferably, one end of the resistor R4 is connected to the output end of the operational amplifier U2, the other end of the resistor R5 is connected to the base of the transistor Q1, one end of the resistor R5 is grounded, the other end of the resistor R5 is connected to the base of the transistor Q1, and the collector of the transistor Q1 is connected to the buzzer BUZZ.
Preferably, the control circuit comprises resistors R6 and R7 and a transistor Q2;
one end of the resistor R6 is connected with the output end of the coupler U1, and the other end is connected with the base stage of the triode Q2;
one end of the resistor R7 is grounded, and the other end of the resistor R7 is connected with the base stage of the triode Q2;
and the collector of the triode Q2 is connected with and controls the PWM pulse width control rectification drive circuit.
The utility model discloses profitable technological effect: the utility model discloses utilize DC resistance bridge when taking place the electric leakage condition, the unanimous balance of every bridge current on the resistance bridge is destroyed, and the bridge output exports the high level after the full-bridge rectification and makes control signal, control PWM switch rectification output voltage and send the electric leakage warning to realize that PWM pulse width control rectification reports to the police to the adjustable sensitivity of earth leakage, ensure operating personnel's life safety, and realize with low costs, the flexibility is high, the circuit is simple, and the practicality is strong.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic circuit diagram of the detection circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following specific embodiments.
As shown in fig. 1-2, the PWM pulse width control rectification ground leakage adjustable sensitivity alarm circuit includes a simulation ground leakage test circuit, a DC resistance bridge, a sensitivity adjustment circuit, a full-bridge rectification circuit, a ground leakage indicator, an optical coupling isolation switch circuit, a multivibrator, a ground leakage alarm circuit, and a control circuit, wherein:
the connection relationship of the respective circuits is as follows:
the output end of the DC resistance bridge circuit is connected with the input end of the sensitivity adjusting circuit of one branch, and the other branch is externally connected with a case; the output end of the sensitivity adjusting circuit is connected with the input end of the full-bridge rectifying circuit; the output end of the full-bridge rectifying circuit is respectively connected with the input ends of the leakage indication circuit and the optical coupling isolating switch circuit; the analog leakage test circuit is directly connected with the DC resistance bridge, and the output end of the optical coupling isolating switch circuit is connected with the input ends of the multivibrator and the control circuit; the output end of the control circuit is connected with and controls the PWM pulse width control rectification drive circuit, and the output end of the multivibrator is connected with the input end of the electric leakage alarm circuit.
The specific electronic circuit principle of each circuit is as follows:
the analog leakage test circuit comprises a test button S1 and a resistor R15, and particularly, the test button S1 and the resistor R15 are connected in series.
Specifically, the DC resistance bridge includes resistances R11, R12, R13, and R14; the R11 is connected with a resistor R13 in series to form a first series branch; the resistor R12 is connected in series with the resistor R14 to form a second series branch, which is connected in parallel with the second series branch.
Specifically, the sensitivity adjusting circuit comprises an adjustable resistor W1, and two ends of the adjustable resistor W1 are respectively connected to a point A and a point B of an intermediate line break between two series resistors of the first series branch and the second series branch.
Specifically, the full-bridge rectification circuit includes diodes D1, D2, D3, and D4; the tail end of the D1 is connected and converged with the front end of the D2 and then is connected to a point B, and the front end of the D1 is connected and converged with the front end of the D3; the tail end of the D3 is connected and converged with the front end of the D4 and then connected to the point A, and the front end of the D2 is connected and converged with the tail end of the D4.
Specifically, the leakage indicator comprises an LED1, a short of the LED1 is connected in series with a junction of the front end of the D1 and the front end of the D3, and the other end of the LED1 is connected with the input end of the optical coupling isolating switch circuit.
Specifically, the optical coupler isolation switch circuit comprises an optical coupler U1; one end of two input ends of the optical coupler U1 is connected with an LED1, and the other end of the two input ends of the optical coupler U1 is connected with a connection junction point of the front end of the D2 and the tail end of the D4; the output end of the optical coupler U1 is connected with a control circuit.
Specifically, the multivibrator includes electrolytic capacitors C1, C2, a diode D5, and an operational amplifier U2; the electrolytic capacitors C1 and C2 are respectively connected with the negative phase input end and the positive phase input end of the operational amplifier U2; the front end of the diode D5 is connected to the negative phase input end of the operational amplifier U2, and the tail end is connected to the output end of the operational amplifier U2.
Specifically, the leakage alarm circuit comprises resistors R4 and R5, a triode Q1 and a buzzer BUZZ; one end of the resistor R4 is connected with the output end of the operational amplifier U2, the other end of the resistor R4 is connected with the base level of the triode Q1, one end of the resistor R5 is grounded, the other end of the resistor R5 is connected with the base level of the triode Q1, and the collector of the triode Q1 is connected with the buzzer BUZZ.
Specifically, the control circuit comprises resistors R6 and R7 and a triode Q2; one end of the resistor R6 is connected with the output end of the coupler U1, and the other end is connected with the base stage of the triode Q2; one end of the resistor R7 is grounded, and the other end of the resistor R7 is connected with the base stage of the triode Q2; and the collector of the triode Q2 is connected with and controls the PWM pulse width control rectification drive circuit.
The utility model discloses during operation, the DC voltage of PWM pulse width control rectifier circuit output passes through by resistance R1, R2, R3, the DC resistance bridge that R4 constitutes, in normal conditions, every bridge current on the resistance bridge is unanimous, the bridge output end is zero (the branch voltage of A point and B point in the picture is unanimous), A, B point does not have the pressure differential, leakage display lamp LED1 is not bright, opto-coupler isolator is not switched on, electric leakage warning buzzer does not sound (by R1, R2, R3, R4, R5, R8, R9, R10, electrolytic capacitor C1, C2, diode D5, operational amplifier U1 constitute multivibrator because do not have the operating voltage of VCC, the event stops oscillating, triode Q1 cuts off). A triode Q2 in the control circuit is cut off in sequence, a collector of a Q2 is high level, the PWM rectification circuit works normally, and direct current is output normally. When electric leakage occurs, one end (point A in the figure) of the output end of the resistance bridge circuit is connected with the outer box, the balance of current consistency of each bridge on the resistance bridge is broken, the output end of the bridge is not zero (in the figure, a voltage difference exists between a voltage division point A of R11 and R12 and a voltage division point B of R13 and R14), a full-bridge rectification is formed by diodes D1, D2, D3 and D4 to output a unidirectional direct current voltage, the leakage display lamp LED1 is lightened, the optical coupler isolating switch is conducted, the leakage alarm buzzer rings (a multivibrator oscillator formed by R1, R2, R3, R4, R5, R8, R9 and R10, electrolytic capacitors C1 and C2, a diode D5 and an operational amplifier U1 obtains a working voltage of VCC, so that oscillation is generated, a triode Q1 works, and the buzzer rings rapidly. A triode Q2 in the control circuit is conducted successively, a collector of the Q2 is at a low level, the SCR rectification circuit stops working, and the direct current output is closed.
In the normal operation process, let + VCC equal to 12V, in fig. 2, D1, D2, D3, D4 are rectifier diodes, and C1 is filter electrolysis. The adjustable resistor W1 is a leakage sensitivity adjusting resistor, and the adjusting range of the embodiment is 2 mA-30 mA.
The PWM pulse width control rectification sensitivity-adjustable alarm circuit for the earth leakage utilizes the fact that when a DC resistance bridge leaks electricity, the balance of current consistency of each bridge on the resistance bridge is damaged, the output end of the bridge outputs a high level after full-bridge rectification to serve as a control signal, the output voltage of the PWM switch rectification is controlled, and an earth leakage alarm is sent out, so that the alarm of the PWM pulse width control rectification sensitivity-adjustable alarm circuit for the earth leakage is achieved, the life safety of operators is guaranteed, the implementation cost is low, the flexibility is high, the circuit is simple, and the practicability is high.
The PWM pulse width control rectification floor drain adjustable sensitivity alarm circuit of the embodiment has the advantages of simple, practical and reliable circuit and low cost, leakage sensitivity parameters can be adjusted according to requirements, and peripheral parameters such as U1 and U2 can be properly changed, so that the circuit can be applied to any place.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. In addition, although specific terms are used in the specification, the terms are used for convenience of description and do not limit the utility model in any way.

Claims (10)

  1. PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage, its characterized in that, including simulation electric leakage test circuit, DC resistance bridge, sensitivity adjusting circuit, full-bridge rectifier circuit, electric leakage instruction, opto-coupler isolator circuit, multivibrator, electric leakage warning circuit and control circuit, wherein:
    the output end of the DC resistance bridge circuit is connected with the input end of the sensitivity adjusting circuit of one branch, and the other branch is externally connected with a case;
    the output end of the sensitivity adjusting circuit is connected with the input end of the full-bridge rectifying circuit;
    the output end of the full-bridge rectifying circuit is respectively connected with the input ends of the leakage indication circuit and the optical coupling isolating switch circuit;
    the analog leakage test circuit is directly connected with the DC resistance bridge, and the output end of the optical coupling isolating switch circuit is connected with the input ends of the multivibrator and the control circuit;
    the output end of the control circuit is connected with and controls the PWM pulse width control rectification drive circuit, and the output end of the multivibrator is connected with the input end of the electric leakage alarm circuit.
  2. 2. The PWM pulse width controlled rectification to earth leakage adjustable sensitivity alarm circuit of claim 1, wherein the analog earth leakage test circuit comprises a test button S1 and a resistor R15;
    the test button S1 and resistor R15 are connected in series.
  3. 3. The PWM pulse width controlled rectification ground leakage adjustable sensitivity alarm circuit of claim 2, wherein the DC resistance bridge comprises resistors R11, R12, R13 and R14;
    the R11 is connected with a resistor R13 in series to form a first series branch; the resistor R12 is connected in series with the resistor R14 to form a second series branch, which is connected in parallel with the second series branch.
  4. 4. The PWM pulse width control rectification earth leakage adjustable sensitivity alarm circuit as claimed in claim 3, wherein the sensitivity adjustment circuit comprises an adjustable resistor W1, and two ends of the adjustable resistor W1 are respectively connected to a point A and a point B of an intermediate line break between two series resistors of the first series branch and the second series branch.
  5. 5. The PWM pulse width controlled rectification to earth leakage adjustable sensitivity alarm circuit as claimed in claim 4, wherein the full bridge rectification circuit comprises diodes D1, D2, D3 and D4;
    the tail end of the D1 is connected and converged with the front end of the D2 and then is connected to a point B, and the front end of the D1 is connected and converged with the front end of the D3;
    the tail end of the D3 is connected and converged with the front end of the D4 and then connected to the point A, and the front end of the D2 is connected and converged with the tail end of the D4.
  6. 6. The PWM pulse width control rectification to earth leakage adjustable sensitivity alarm circuit as claimed in claim 5, wherein the leakage indication comprises an LED1, one end of the LED1 is connected in series with the junction of the front end of D1 and the front end of D3, and the other end is connected with the input end of the optical coupling isolation switch circuit.
  7. 7. The PWM pulse width controlled rectification to earth leakage adjustable sensitivity alarm circuit of claim 6, wherein the optical coupling isolation switch circuit comprises an optical coupler U1;
    one end of two input ends of the optical coupler U1 is connected with an LED1, and the other end of the two input ends of the optical coupler U1 is connected with a connection junction point of the front end of the D2 and the tail end of the D4; the output end of the optical coupler U1 is connected with a control circuit.
  8. 8. The PWM pulse width controlled rectification ground leakage adjustable sensitivity alarm circuit of claim 7, wherein the multivibrator comprises electrolytic capacitors C1, C2, a diode D5 and an operational amplifier U2;
    the electrolytic capacitors C1 and C2 are respectively connected with the negative phase input end and the positive phase input end of the operational amplifier U2; the front end of the diode D5 is connected to the negative phase input end of the operational amplifier U2, and the tail end is connected to the output end of the operational amplifier U2.
  9. 9. The PWM pulse width control rectification earth leakage adjustable sensitivity alarm circuit as claimed in claim 8, wherein the earth leakage alarm circuit comprises resistors R4 and R5, a triode Q1 and a buzzer BUZZ;
    one end of the resistor R4 is connected with the output end of the operational amplifier U2, the other end of the resistor R4 is connected with the base level of the triode Q1, one end of the resistor R5 is grounded, the other end of the resistor R5 is connected with the base level of the triode Q1, and the collector of the triode Q1 is connected with the buzzer BUZZ.
  10. 10. The PWM pulse width controlled rectification ground leakage adjustable sensitivity alarm circuit of claim 9, wherein the control circuit comprises resistors R6, R7 and a transistor Q2;
    one end of the resistor R6 is connected with the output end of the coupler U1, and the other end is connected with the base stage of the triode Q2;
    one end of the resistor R7 is grounded, and the other end of the resistor R7 is connected with the base stage of the triode Q2;
    and the collector of the triode Q2 is connected with and controls the PWM pulse width control rectification drive circuit.
CN202021747017.0U 2020-08-19 2020-08-19 PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage Active CN212969036U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021747017.0U CN212969036U (en) 2020-08-19 2020-08-19 PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021747017.0U CN212969036U (en) 2020-08-19 2020-08-19 PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage

Publications (1)

Publication Number Publication Date
CN212969036U true CN212969036U (en) 2021-04-13

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CN202021747017.0U Active CN212969036U (en) 2020-08-19 2020-08-19 PWM pulse width control rectification is to adjustable sensitivity warning circuit of earth leakage

Country Status (1)

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CN (1) CN212969036U (en)

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