CN213754308U

CN213754308U - Control circuit for power supply enabling

Info

Publication number: CN213754308U
Application number: CN202022830352.3U
Authority: CN
Inventors: 胡建和; 徐国权
Original assignee: Shenzhen Race Fox Electronic Technology Co ltd
Current assignee: Shenzhen Race Fox Electronic Technology Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-07-20
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a be used for power enable control circuit belongs to power supply circuit technical field, has solved the problem that signal control transmission reliability is low, and its technical scheme main points are including enabling control module, enable control module's output is connected with isolation control circuit, isolation control circuit includes resistance R1, resistance R2, resistance R3, resistance R4, optoelectronic coupler U1 and PNP triode Q1, carries out small-signal isolation control to power drive with optoelectronic coupler U1, triode Q1, resistance electric capacity, realizes opening or turn-off control to power output, and it is very convenient to use, reliable, safety.

Description

Control circuit for power supply enabling

Technical Field

The utility model relates to a power supply circuit field relates to a be used for power to enable control circuit especially.

Background

Generally, there are power circuit modules such as AC/DC, DC/AC, etc. on the power circuit module, the power circuit module includes a voltage stabilizing control module, a control chip, and a peripheral circuit, wherein the control chip may be a UC3843 chip U2, which has eight pins, wherein the first pin is an error amplifier output and can be used for loop compensation; the second pin is used for voltage feedback, and is the inverting input end of the error amplifier and is connected to the output of the switching power supply through a resistor wind pressure device; the sixth pin is used as an output which directly drives the grid electrode of the transistor MOSFET; the eighth pin is a reference output that provides a charging current to capacitor CT through resistor RT as an input for a reference voltage signal Vref. Other pins may additionally configure peripheral circuitry depending on the circuit design.

At present, a single chip microcomputer is adopted as the output of a control signal, the control signal output by the single chip microcomputer is easily interfered, a high-level or low-level signal cannot be directly provided for a proper reference voltage Vref of the chip U2, and the conversion control of the reference voltage cannot be directly connected through the single chip microcomputer, so that an intermediate circuit needs to be designed, and the eighth pin and the second pin can be reliably controlled.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's weak point, solve the technical problem in the correlation technique to a certain extent at least, provide one kind and be used for power to enable control circuit to reach the electrical isolation, improve safety protection's purpose.

In order to solve the technical problem, the technical scheme of the utility model is that: a power supply enabling control circuit comprises an enabling control module, wherein an output end of the enabling control module is connected with an isolation control circuit, the isolation control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a photoelectric coupler U1 and a PNP triode Q1, an input side of the photoelectric coupler U1 is connected with the enabling control module through a resistor R1, a collector of an output side of the photoelectric coupler U1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3 and a base of the PNP triode Q1, the other end of the resistor R3 is connected with an emitter of the PNP triode Q1 and serves as a first connecting end, a collector of the PNP triode Q1 is connected with one end of a resistor R4 and serves as a second connecting end, the other end of the resistor R4 and the emitter of the output side of the photoelectric coupler U1 are grounded together, the first connecting end is used for being connected with a second pin of a chip UC3843, the second connection end is used for connecting an eighth pin of the chip UC 3843.

As a specific aspect of the present invention, it may be preferable that: the energy control module is also connected with a pyroelectric infrared sensor for acquiring human body induction signals, and a power supply loop of the pyroelectric infrared sensor is provided with a switch circuit module for controlling whether the pyroelectric infrared sensor works.

As a specific aspect of the present invention, it may be preferable that: the switch circuit module comprises a power switch S1, a CD4011 chip U11, a CD4013 chip U22, a triode Q2 and a relay K1, wherein the power switch is connected between the CD4011 chip U11 and a voltage source and used for providing a trigger signal, the CD4011 chip U11 and the CD4013 chip U22 are connected with each other and output a control chip to the base electrode of the triode Q2, the emitter electrode of the triode Q2 is connected with the voltage source, the collector electrode of the triode Q2 is connected with the relay K1, and a normally open switch of the relay K1 is connected to a power supply circuit of the pyroelectric infrared sensor.

As a specific aspect of the present invention, it may be preferable that: the coil part of the relay K1 is connected in parallel with a diode D1 in the opposite direction.

The utility model discloses technical effect mainly embodies in following aspect: adopt photoelectric coupler U1 and PNP triode Q1 etc. to control circuit signal transmission to have electrical isolation's effect, improve signal transmission control reliability, realize the reliable control to UC3843 chip U2, convenience simple to use can be equipped with pyroelectric infrared sensor in addition and carry out human induction detection, utilize switch circuit module to control human induction detection simultaneously, improve operational reliability and energy-conserving effect.

Drawings

FIG. 1 is a schematic diagram of a circuit configuration in an embodiment;

fig. 2 is a schematic circuit diagram of a switching circuit module in an embodiment.

Reference numerals: 100. enabling the control module; 200. an isolation control circuit; 300. a pyroelectric infrared sensor; 400. and a switch circuit module.

Detailed Description

The embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings, and the embodiments described below by referring to the drawings are exemplary and intended to explain the present invention so that the technical solutions of the present invention can be more easily understood and grasped, and cannot be construed as limiting the present invention.

Example 1:

a power supply enabling control circuit is disclosed, referring to fig. 1, comprising an enabling control module 100, an output end of the enabling control module 100 is connected with an isolating control circuit 200, the isolating control circuit 200 comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a photoelectric coupler U1 and a PNP triode Q1, an input side of the photoelectric coupler U1 is connected with the enabling control module 100 through a resistor R1, a collector of an output side of the photoelectric coupler U1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3 and a base of the PNP triode Q1, the other end of the resistor R3 is connected with an emitter of the PNP triode Q1 and serves as a first connection end, a collector of the PNP triode Q1 is connected with one end of a resistor R4 and serves as a second connection end, the other end of the resistor R4 is commonly grounded with the emitter of the output side of the photoelectric coupler U1, the first connection end is used for connecting with a second pin of a chip UC3843, the second connection end is used for connecting an eighth pin of the chip UC 3843.

Enable control module 100 is the singlechip, its pin can export high level or low level, this moment when enable control module 100 output high level when resistance R1's one end, when the tip of optoelectronic coupler U1 is the low level, optoelectronic coupler will trigger to switch on this moment, switch on at the right side output, make resistance R2's left end ground connection, divide voltage modulation through resistance R3 and resistance R2 this moment, make triode Q1 switch on, thereby make the potential that chip U2's eighth pin street arrived draw low, thereby form low-voltage feedback. In addition, similarly, according to the control of the single chip microcomputer, the eighth pin of the chip U2 can directly receive the high-level signal output by the voltage stabilization control.

In addition, example 2:

based on the circuit of the above embodiment, in order to further improve the operational reliability and the energy saving property. The pyroelectric infrared sensor 300 is arranged on the single chip microcomputer to sense a human body so as to obtain the receiving of human body sensing control.

Referring to fig. 2, a pyroelectric infrared sensor 300 is further connected to the enable control module 100 for acquiring a human body sensing signal, a switch circuit module 400 is disposed on a power supply loop of the pyroelectric infrared sensor 300, and the switch circuit module 400 is used for controlling whether the pyroelectric infrared sensor 300 works.

The switch circuit module 400 comprises a power switch S1, a CD4011 chip U11, a CD4013 chip U22, a triode Q2 and a relay K1. The power switch is connected between the CD4011 chip U11 and a voltage source and used for providing a trigger signal, the CD4011 chip U11 and the CD4013 chip U22 are connected and output a control chip to a base electrode of the triode Q2, an emitting electrode of the triode Q2 is connected with the voltage source, a collector electrode of the triode Q2 is connected with the relay K1, and a normally open switch of the relay K1 is connected to a power supply circuit of the pyroelectric infrared sensor 300.

The CD4011 chip U11 comprises NAND gates U11A, U11B, U11C and U11D.

Referring to fig. 2, specific circuit connections of the switch circuit module 400 are shown, and some configuration resistors R11, R12, R13, a capacitor C11, and the like are included therein.

The specific connection relationship of the device is that a voltage source Vcc is connected with one end of a resistor R11, one input end of a U11B, one input of a U11A, a fifth pin of a chip U22, one end of a capacitor C11, an emitter of a triode Q2 and one end of a resistor R14; the other end of the resistor R11 is connected with one end of a power switch S1, the other input end of U11B and the other input end of U11A; the output end of U11B is connected with one input end of U11C, the output end of U11A is connected with one input end of U11D, the input end of U11C is connected with one end of a resistor R13, the other end of a resistor R13 is connected with the base of a triode Q2, the collector of the triode Q2 is connected with one end of a relay K1, the third pin of a chip U22 is connected with the output end of U11D, the second pin of the chip U22 is connected with the other end of a capacitor C11 and one end of a resistor R12, and the other end of the resistor R12 is connected with the other end of a power switch S1 and the ground; the fourth pin of the chip U22 is connected with the other input end of the U11D; the first pin of the chip U22 is connected to the other input of U11C. The other end of the relay is grounded. The coil part of the relay K1 is connected in parallel with a diode D1 in the opposite direction.

The working process and the effect are as follows:

assuming that the power switch S1 is in a closed state during power failure, when the circuit is powered up again, one pin of the nand gate U11A is at a low level, so the output terminal of U11A is at a high level, and one input pin of U11D is at a high level; when the circuit is just powered on, the fourth pin of the D flip-flop chip U22 is powered on and reset through the capacitor C11 and the resistor R12, so that the output Q = D =0,/Q =1 of the D flip-flop. the/Q terminal, the second pin of the chip U22, is also connected to U11D, which causes the output terminal of U11D to be low. This maintains the output of the D flip-flop in a low state. The low level of the Q terminal (first pin) of the flip-flop U22 is connected to the input terminal of the nand gate U11C, so that the output terminal of U11C outputs the high level, the PNP type triode is turned off, the relay K1 does not act, and the pyroelectric infrared sensor 300 does not work.

To re-operate the pyroelectric infrared sensor 300, the power switch S1 needs to be opened again and then closed.

When the power switch S1 is turned on, the state of the circuit changes. After the power switch S1 is turned on, one of the pins of the nand gates U11A and U11B goes high. Thus, both inputs of U11A are high, so the output of U11A goes low, so the output of U11D is high. And the fifth pin of the D flip-flop is connected to the voltage source Vcc and is at a high level. Thus, D flip-flop U22 toggles, Q = D =1,/Q = 0. the/Q (the second pin of the chip U22) is connected to one input of the NAND gate U11D, and maintains the high level of the third pin of the D flip-flop U22. Meanwhile, the first pin of the D flip-flop U22 outputs a high level to an input terminal of U11C, which makes an input terminal of U11C also high. However, the other pin of the input terminal of U11C is low, so the output terminal of U11C is still high, and transistor Q1 is not conducting.

After the power switch S1 is closed, the triode Q1 is conducted, and the relay is pulled to work. Then, since the U11D is already in the locked state, the level of the output terminal of the U11D is not changed any more, the D flip-flop is also in the locked state, and the output is maintained at the high level.

In summary, the above structure design makes the circuit control work more reliable and energy-saving.

Of course, the above is only a typical example of the present invention, and besides, the present invention can also have other various specific embodiments, and all technical solutions adopting equivalent replacement or equivalent transformation are all within the scope of the present invention as claimed.

Claims

1. A power supply enable control circuit comprises an enable control module and is characterized in that an output end of the enable control module is connected with an isolation control circuit, the isolation control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a photoelectric coupler U1 and a PNP triode Q1, an input side of the photoelectric coupler U1 is connected with the enable control module through a resistor R1, a collector of an output side of the photoelectric coupler U1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3 and a base of the PNP triode Q1, the other end of the resistor R3 is connected with an emitter of the PNP triode Q1 to serve as a first connection end, a collector of the PNP triode Q1 is connected with one end of a resistor R4 to serve as a second connection end, the other end of the resistor R4 and the emitter of the output side of the photoelectric coupler U1 are grounded together, the first connection end is used for being connected with a second pin of a chip UC3843, the second connection end is used for connecting an eighth pin of the chip UC 3843.

2. A control circuit for power supply enabling according to claim 1, wherein: the energy control module is also connected with a pyroelectric infrared sensor for acquiring human body induction signals, and a power supply loop of the pyroelectric infrared sensor is provided with a switch circuit module for controlling whether the pyroelectric infrared sensor works.

3. A control circuit for power supply enabling according to claim 2, wherein: the switch circuit module comprises a power switch S1, a CD4011 chip U11, a CD4013 chip U22, a triode Q2 and a relay K1, wherein the power switch is connected between the CD4011 chip U11 and a voltage source and used for providing a trigger signal, the CD4011 chip U11 and the CD4013 chip U22 are connected with each other and output a control chip to the base electrode of the triode Q2, the emitter electrode of the triode Q2 is connected with the voltage source, the collector electrode of the triode Q2 is connected with the relay K1, and a normally open switch of the relay K1 is connected to a power supply circuit of the pyroelectric infrared sensor.

4. A control circuit for power supply enabling according to claim 3, wherein: the coil part of the relay K1 is connected in parallel with a diode D1 in the opposite direction.