CN210838930U

CN210838930U - Power supply protection circuit

Info

Publication number: CN210838930U
Application number: CN201922135781.6U
Authority: CN
Inventors: 崔卫星
Original assignee: Beijing Softcom Smart City Technology Co ltd
Current assignee: Beijing Softong Intelligent Technology Co ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-06-23
Anticipated expiration: 2029-12-03

Abstract

The embodiment of the utility model discloses a power supply protection circuit, which comprises a first power detection circuit, a first power adjusting circuit, a first control circuit and a first power device; the first power detection circuit is used for generating a turn-off signal of the first power device when the electric equipment is in overvoltage or overcurrent; the first power regulating circuit is used for generating a switching-on signal of the first power device within preset time according to a switching-off signal of the first power device and outputting the switching-on signal from a signal output end of the first power device; the input end of the first control circuit is electrically connected with the signal output end of the first power detection circuit and the signal output end of the first power adjusting circuit respectively, and the output end of the first control circuit is electrically connected with the first power device. The embodiment of the utility model provides a technical scheme has realized when taking place the inside short circuit of consumer or power exceeds standard, cuts off consumer and power supply unit's being connected fast, and when consumer self-resuming back, access equipment that can be timely quick again makes the normal operating of system.

Description

Power supply protection circuit

Technical Field

The embodiment of the utility model provides a relate to equipment protection technical field, especially relate to a power protection circuit.

Background

In recent years, monitoring equipment, data transmission equipment, edge operation alarm equipment and the like in the hazardous chemical industry are increasingly and commonly applied to hazardous chemical sources locally, and power supply safety and power utilization safety of the equipment are emphasized.

In the safety power utilization and power supply system in the prior art, the power utilization equipment is generally connected with the power supply equipment through the fuse, the power supply equipment adopts the connection mode of the intrinsic safety power supply, and when some monitoring systems need to set hundreds of or even thousands of equipment points, the problems of complex construction and high cost can be caused by adopting the connection mode. And after the electric equipment recovers, the electric equipment is difficult to be quickly connected into a power supply system in time.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a power protection circuit to realize when taking place the inside short circuit of consumer or power exceeds standard, cut off consumer and power supply unit's being connected fast, after consumer self-resuming, the access equipment that can be timely quick again makes the normal operating of system.

The embodiment of the utility model provides a pair of power protection circuit, include: the power supply comprises a first power detection circuit, a first power regulation circuit, a first control circuit and a first power device;

the first power device is connected between power supply equipment and electric equipment, and the power supply equipment outputs power supply voltage to the electric equipment;

the first power detection circuit comprises a power input end and a signal output end, wherein the power input end of the first power detection circuit is connected with a first voltage, and the first power detection circuit is used for generating a turn-off signal of the first power device and outputting the turn-off signal from the signal output end of the first power device when the electric equipment is in overvoltage or overcurrent;

the first power regulating circuit comprises a power supply input end and a signal output end, the power supply input end of the first power regulating circuit is connected with the first voltage, and the first power regulating circuit is used for generating an on signal of the first power device within preset time according to an off signal of the first power device and outputting the on signal from the output end of the first power device;

the first control circuit comprises an input end and an output end, the input end of the first control circuit is electrically connected with the output end of the first power detection circuit and the output end of the first power adjusting circuit respectively, and the output end of the first control circuit is electrically connected with the first power device.

Optionally, the first power detection circuit includes a current detection circuit, and the current detection circuit includes a first resistor, a second resistor, a third resistor, and a first operational amplifier;

the first end of the first resistor is connected to the first voltage, the second end of the first resistor is electrically connected with the positive end of the first operational amplifier through the second resistor, the negative end of the first operational amplifier is grounded through the third resistor, the first voltage end of the first operational amplifier is connected to the first voltage, the second voltage end of the first operational amplifier is grounded, and the output end of the first operational amplifier is electrically connected with the input end of the first control circuit.

Optionally, the first power detection circuit further includes a voltage detection circuit, where the voltage detection circuit includes a fourth resistor, a fifth resistor, a first capacitor, and a second operational amplifier;

the positive end of the second operational amplifier is connected with a second voltage, the negative end of the second operational amplifier is electrically connected with the second end of the fourth resistor, the first end of the fourth resistor is connected with a third voltage, the second end of the fourth resistor is grounded through a fifth resistor, and the first capacitor is connected in parallel with the two ends of the fifth resistor;

the first voltage end of the second operational amplifier is connected to the first voltage, the second end of the second operational amplifier is grounded, and the output end of the second operational amplifier is electrically connected with the input end of the first control circuit.

Optionally, the first control circuit includes a sixth resistor and a third operational amplifier;

the first end of the sixth resistor is electrically connected with the positive end of the third operational amplifier, the second end of the sixth resistor is connected with the first voltage, the positive end of the third operational amplifier is respectively electrically connected with the output end of the first operational amplifier and the output end of the second operational amplifier, the negative end of the third operational amplifier is connected with the second voltage, the first voltage end of the third operational amplifier is connected with the first voltage, the second voltage end of the third operational amplifier is grounded, and the output end of the third operational amplifier outputs a comparison voltage signal.

Optionally, the first control circuit further includes a seventh resistor, an eighth resistor, a ninth resistor, a first triode, a second capacitor, and a first diode;

a first end of the seventh resistor is electrically connected with an output end of the third operational amplifier, a second end of the seventh resistor is electrically connected with a first end of the first triode, a second end of the first triode is connected with a third voltage, and a third end of the first triode is connected with the third voltage through the eighth resistor;

a first end of the first diode is electrically connected with a third end of the first triode, a second end of the first diode is electrically connected with a first end of the second capacitor, a second end of the second capacitor is electrically connected with a second end of the first triode, and the ninth resistor is connected with the first diode in parallel;

the second end of the first diode is electrically connected with the first pole of the first power device, the second pole of the first power device is electrically connected with the input end of the electric equipment, and the third pole of the first power device is electrically connected with the output end of the power supply equipment.

Optionally, the first power regulating circuit includes a fourth operational amplifier and a first control chip, where the first control chip includes a first input trigger terminal, a pulse output terminal, a power supply terminal, and a ground terminal;

the first input trigger end of the first control chip is electrically connected with the positive end of the third operational amplifier, the pulse output end of the first control chip is electrically connected with the negative end of the fourth operational amplifier, the positive end of the fourth operational amplifier is connected with the second voltage, the first voltage end of the fourth operational amplifier is connected with the first voltage, the second voltage end of the fourth operational amplifier is grounded, and the output end of the fourth operational amplifier is electrically connected with the first input trigger end of the first control chip;

the power supply end of the first control chip is connected to the first voltage, and the grounding end of the first control chip is grounded.

Optionally, the first power regulating circuit further includes a tenth resistor and a third capacitor, and the first control chip further includes a second input trigger terminal, a first regulating terminal, and a second regulating terminal;

a first end of the tenth resistor is connected to the first voltage, a second end of the tenth resistor is electrically connected to a first end of the third capacitor, a second end of the third capacitor is electrically connected to a second adjusting end of the first control chip, and a first adjusting end of the first control chip is electrically connected to a second end of the tenth resistor;

and the second adjusting end of the first control chip is electrically connected with the second input trigger end of the first control chip.

Optionally, the power supply further includes a second power detection circuit, a second power adjustment circuit, a second control circuit, and a second power device, wherein a third pole of the second power device is electrically connected to a second pole of the first power device, the second pole of the second power device is electrically connected to the input terminal of the electric device, and the first pole of the second power device is electrically connected to the output terminal of the second control circuit.

Optionally, the primary protection circuit of the power protection circuit includes the first power detection circuit, the first power adjustment circuit, the first control circuit, and the first power device;

the secondary protection circuit of the power protection circuit comprises the second power detection circuit, the second power regulation circuit, the second control circuit and the second power device.

Optionally, the power protection circuit further includes a first power indicator circuit, where the first power indicator circuit includes an eleventh resistor and a first indicator light;

a first end of the eleventh resistor is electrically connected with an output end of the power supply equipment, and a second end of the eleventh resistor is grounded through a first indicator lamp;

the power supply circuit also comprises a second power supply indicating lamp circuit, wherein the second power supply indicating lamp circuit comprises a twelfth resistor and a second indicating lamp;

the first end of the twelfth resistor is electrically connected with the input end of the electric equipment, and the second end of the twelfth resistor is grounded through a second indicator lamp.

The embodiment of the utility model provides a when detecting that the power of consumer exceeds standard or the short circuit through first power detection circuitry, turn off the signal according to excessive pressure or overcurrent signal generation first power device, first control circuit is according to the turn off signal control first power device and is shut off to cut off the electricity between consumer and the power supply unit; when the electric equipment recovers, the first power regulating circuit generates an opening signal of the first power device, the first control circuit conducts the first power device according to the opening signal, and the electric equipment is quickly connected into a power supply system to ensure the normal operation of the system. The embodiment of the utility model provides a through with power protection circuit connection between power supply unit and consumer, can effectual protection power supply unit to monitoring consumer's power consumption safety, can realizing that the consumer is when short circuit or power surpass standard appearing, quick cutting off consumer and power supply unit's being connected, after the consumer self-resuming, can be in time quick insert power supply system with the consumer.

Drawings

Fig. 1 is a schematic structural diagram of a power protection circuit according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another power protection circuit according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another power protection circuit according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another power protection circuit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another power protection circuit according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a schematic structural diagram of a power protection circuit provided by an embodiment of the present invention. Referring to fig. 1, the power protection circuit includes: the first power detection circuit 10, the first power regulation circuit 20, the first control circuit 30 and the first power device Q1;

the first power device Q1 is connected between the power supply apparatus 100 and the electric equipment 200, and the power supply apparatus 100 outputs a supply voltage to the electric equipment 200;

the first power detection circuit 10 comprises a power input end a1 and a signal output end a2, the power input end a1 of the first power detection circuit 10 is connected to a first voltage VCC1, and the first power detection circuit 10 is configured to generate a turn-off signal of the first power device Q1 when the electric device 200 is over-voltage or over-current and output the turn-off signal from the signal output end a 2;

the first power regulating circuit 20 comprises a power input terminal B1 and a signal output terminal B2, the power input terminal B1 of the first power regulating circuit 20 is connected to a first voltage VCC1, and the first power regulating circuit 20 is configured to generate an on signal of the first power device Q1 within a preset time according to an off signal of the first power device Q1 and output the on signal from a signal output terminal B2 thereof;

the first control circuit 30 includes an input terminal C1 and an output terminal C2, the input terminal C1 of the first control circuit 30 is electrically connected to the signal output terminal a2 of the first power detection circuit 10 and the signal output terminal B2 of the first power adjustment circuit 20, respectively, and the output terminal C2 of the first control circuit 30 is electrically connected to the first power device Q1.

Specifically, the first power device Q1 is electrically connected between the power supply device 100 and the electric device 200, the first power detection circuit 10 detects whether the power of the electric device 200 exceeds the standard or whether the electric device is short-circuited, when the power of the electric device 200 exceeds the standard, the electric device 200 is over-voltage or over-current, and the electric device 200 does not output at this time. When the first power detection circuit 10 detects an overvoltage or overcurrent signal of the powered device 200, a turn-off signal of the first power device Q1 is generated according to the overvoltage or overcurrent signal. The first control circuit 30 controls the first power device Q1 to turn off according to the received turn-off signal of the first power device Q1, and uses no power transmission between the electric device 200 and the power supply device 100, thereby effectively protecting the power consumption safety of the electric device 200 and the power supply safety of the power supply device 100. The first power regulating circuit 20 generates an on signal of the first power device Q1 within a preset time according to an off signal of the first power device Q1, so that the first power device Q1 is turned on, the electric equipment 200 is connected to a power supply system, and the system operates normally. When the power supply apparatus 100 fails to operate, the first power detection circuit 10 also generates an off signal of the first power device Q1 to disconnect the power supply apparatus 100 from the electrical equipment 200, thereby effectively monitoring the operating conditions of the power supply apparatus 100 and the electrical equipment 200.

When the electric equipment or the power supply equipment recovers to normal operation, the first power regulating circuit 20 detects that the system power is below the limit power, and generates an on signal of the first power device Q1, and controls the first power device to be on through the first control circuit 30, so that the system operates normally.

For example, the power protection circuit can be applied to a power supply system with an input voltage of 10-60V, a maximum current is set to be 10A, i.e., a maximum power is 600W, and the first power regulating circuit 20 regulates and limits the power to be 600W. When the first power detection circuit 10 detects that the power of the device exceeds 600W, a turn-off signal of the first power device Q1 is output to the first control circuit 30, and the first control circuit 30 controls the first power device Q1 to turn off, wherein the first power device Q1 may be an IGBT. The first power regulating circuit 20 outputs an on signal of the first power device Q1 within a preset time, if the power of the equipment still exceeds the standard within the preset time, the first power regulating circuit 20 continues to convert an off signal of the first power device Q1 into an on signal of the first power device Q1 until the power of the equipment is lower than 600W, the first power regulating circuit 20 outputs the on signal of the first power device Q1, the first power device Q1 is controlled to be turned on through the first control circuit 30, and the electric equipment 200 is connected into the power supply system.

Optionally, fig. 2 is a schematic structural diagram of another power protection circuit provided in an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the first power detection circuit 10 includes a current detection circuit 11, and the current detection circuit 11 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first operational amplifier OA 1;

the first end of the first resistor R1 is connected to a first voltage VCC1, the second end of the first resistor R1 is electrically connected to the positive terminal of the first operational amplifier OA1 through the second resistor R2, the negative terminal of the first operational amplifier OA1 is grounded through the third resistor R3, the first voltage end of the first operational amplifier OA1 is connected to the first voltage VCC1, the second voltage end of the first operational amplifier OA1 is grounded, and the output terminal of the first operational amplifier OA1 is electrically connected to the input terminal C1 of the first control circuit 30.

Specifically, the output voltage of the power supply system is determined, and then the limiting current is determined, wherein the limiting current is determined by a third resistor R3, wherein the third resistor R3 is an adjustable resistor, and the limiting power can be obtained according to the product of the limiting current and the voltage. The first operational amplifier OA1 is used for comparison, and a current reference value is inputted to the positive terminal of the first operational amplifier OA1, and a detected current value is inputted to the negative terminal of the first operational amplifier OA 1. When the current value of the positive terminal of the first operational amplifier OA1 is greater than the current value of the negative terminal of the first operational amplifier OA1, outputting a high level; when the current value of the positive terminal of the first operational amplifier OA1 is smaller than the current value of the negative terminal of the first operational amplifier OA1, a low level is output. When the first power detection circuit 10 detects that the power of the electric device 200 exceeds the standard, the current detected by the negative terminal of the first operational amplifier OA1 is greater than the reference current of the positive terminal thereof, and the first operational amplifier OA1 outputs a low level; when the current value of the power-consuming equipment is smaller than the reference current after the power-consuming equipment recovers, the first operational amplifier OA1 outputs high level.

Optionally, on the basis of the foregoing embodiment, with continued reference to fig. 2, the first power detection circuit 10 further includes a voltage detection circuit 12, and the voltage detection circuit 12 includes a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second operational amplifier OA 1;

the positive terminal of the second operational amplifier OA1 is connected to a second voltage VCC2, the negative terminal of the second operational amplifier OA2 is electrically connected to the second terminal of a fourth resistor R4, the first terminal of the fourth resistor R4 is connected to a third voltage VCC3, the second terminal of the fourth resistor R4 is grounded through a fifth resistor R5, and a first capacitor C1 is connected in parallel to two terminals of a fifth resistor R5;

the first voltage terminal of the second operational amplifier OA1 is connected to the first voltage VCC1, the second terminal of the second operational amplifier OA1 is grounded, and the output terminal of the second operational amplifier OA2 is electrically connected to the input terminal C1 of the first control circuit 30.

Specifically, the first voltage VCC1 is a supply voltage of the second operational amplifier OA2, the second voltage VCC2 is a reference voltage, and the third voltage VCC3 is an input voltage of the first power device Q1 and is also an input voltage of the electric device 200. When the power of the electric device 200 exceeds the standard, that is, when the electric device 200 is over-voltage, the voltage output to the cathode terminal of the second operational amplifier OA2 after the third voltage VCC3 passes through the fourth resistor R4 and the fifth resistor R5 is greater than the reference voltage VCC2, and therefore, the second operational amplifier OA2 outputs a low level. When the input voltage VCC3 of the electric device 200 is within the normal voltage range, the voltage output through the fourth resistor R4 and the fifth resistor R5 is less than the reference voltage, and the second operational amplifier OA2 outputs a high level. The first control circuit 30 controls the first power device Q1 to be turned off according to the low level output by the first operational amplifier OA1 and the second operational amplifier OA2, and the electric equipment 200 is disconnected from the power supply equipment 100, so that the power consumption safety of the electric equipment and the power supply safety of the power supply equipment are ensured.

Optionally, fig. 3 is a schematic structural diagram of another power protection circuit provided in an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 3, the first control circuit 30 includes a sixth resistor R6 and a third op-amp OA 3;

the first end of the sixth resistor R6 is electrically connected with the positive end of the third operational amplifier OA3, the second end of the sixth resistor R6 is connected to the first voltage VCC1, the positive end of the third operational amplifier OA3 is electrically connected with the output end of the first operational amplifier OA1 and the output end of the second operational amplifier OA2, the negative end of the third operational amplifier OA3 is connected to the second voltage VCC2, the first voltage end of the third operational amplifier OA3 is connected to the first voltage VCC1, the second voltage end of the third operational amplifier OA3 is grounded, and the output end of the third operational amplifier OA3 outputs a comparison voltage signal.

Specifically, the second voltage VCC2 is a reference voltage of the third operational amplifier OA3, and the positive terminal of the third operational amplifier OA3 receives the turn-off signal of the first power device Q1 output by the first operational amplifier OA1 and the second operational amplifier OA2, respectively. When the third operational amplifier OA3 receives the low level output by the first operational amplifier OA1 or the second operational amplifier OA2, the first power device Q1 is controlled to be turned off, and the electric device 200 is disconnected from the power supply device 100; when the third operational amplifier OA3 receives the high level output by the first operational amplifier OA1 or the second operational amplifier OA2, the first power device Q1 is controlled to be turned on, and the electric device 200 is reconnected to the power supply system of the power supply device 100.

Optionally, on the basis of the foregoing embodiment, with continued reference to fig. 3, the first control circuit 30 further includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor Q2, a second capacitor C2, and a first diode D1;

a first end of the seventh resistor R7 is electrically connected with an output end of the third operational amplifier OA3, a second end of the seventh resistor R7 is electrically connected with a first end of the first triode Q2, a second end of the first triode Q2 is connected to the third voltage VCC3, and a third end of the first triode Q2 is connected to the third voltage VCC3 through the eighth resistor R8;

a first end of a first diode D1 is electrically connected with a third end of the first triode Q2, a second end of a first diode D1 is electrically connected with a first end of a second capacitor C2, a second end of the second capacitor C2 is electrically connected with a second end of the first triode Q2, and a ninth resistor R9 is connected with the first diode D1 in parallel;

a second terminal of the first diode D1 is electrically connected to a first pole of the first power device Q1, a second pole of the first power device Q1 is electrically connected to the input terminal of the powered device 200, and a third pole of the first power device Q1 is electrically connected to the output terminal of the power supply device 100.

Specifically, the first power device Q1 may be an IGBT, and has characteristics of small driving power and low saturation voltage. When the third operational amplifier OA3 outputs a high level, i.e., the on signal of the first power device Q1, the driving capability of the high level on signal is small, and the first power device Q1 cannot be turned on completely, so that the current of the on signal of the first power device Q1 of the third operational amplifier OA3 is amplified by the first transistor Q2 to enhance the driving capability. The first power device Q1 is connected between the power supply device 100 and the electric equipment 200, and when the third operational amplifier OA3 outputs a high level, the first power device Q1 is controlled to be turned on after the driving capability of the on signal is amplified by the first triode Q2, and the electric equipment 200 is electrically connected with the power supply device 100. Because the switching speed of the first power device is very fast, the electric equipment 200 can be quickly connected to the power supply system, and the normal operation of the system is ensured.

Optionally, fig. 4 is a schematic structural diagram of another power protection circuit provided in an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 4, the first power regulating circuit 20 includes the fourth operational amplifier OA4 and the first control chip U1, and the first control chip U1 includes the first input trigger terminal 1, the pulse output terminal 2, the power supply terminal 3 and the ground terminal 4;

a first input trigger terminal 1 of the first control chip U1 is electrically connected with a positive terminal of a third operational amplifier OA3, a pulse output terminal 2 of the first control chip U1 is electrically connected with a negative terminal of a fourth operational amplifier OA4, the positive terminal of the fourth operational amplifier OA4 is connected with a second voltage VCC2, a first voltage terminal of the fourth operational amplifier OA4 is connected with a first voltage VCC1, a second voltage terminal of the fourth operational amplifier OA4 is grounded, and an output terminal of the fourth operational amplifier OA4 is electrically connected with a first input trigger terminal 1 of the first control chip U1;

the power terminal 3 of the first control chip U1 is connected to the first voltage VCC1, and the ground terminal 4 of the first control chip U1 is grounded.

Specifically, the first control chip U1 may be a multi-oscillator HCF4538BEY, configured to control the inversion of the high and low levels to complete the conduction of the first power device Q1. During the normal operation of the system, the first input trigger terminal 1 of the first control chip U1 is at a high level, when the first power detection circuit 10 detects that the power of the electric device 200 exceeds the standard, the first power detection circuit 10 outputs an off signal of the first power device Q1 at a low level, at this time, the level of the first input trigger terminal 1 of the first control chip U1 changes from the high level to the low level, the pulse output terminal 2 of the first control chip U1 simultaneously outputs the low level to the cathode terminal of the fourth operational amplifier OA4, the reference voltage is input to the anode terminal of the fourth operational amplifier OA4, and since the low level of the cathode terminal of the fourth operational amplifier OA4 is less than the reference voltage input to the anode terminal thereof, the fourth operational amplifier OA4 outputs the low level, and the first power device Q1 is in an off state. When the electric device 200 recovers, the first power detection circuit 10 outputs a high level, since the signal received by the first input trigger terminal 1 of the first control chip U1 is a high level, the pulse output terminal 2 outputs a high level to the cathode terminal of the fourth operational amplifier OA4, the fourth operational amplifier OA4 outputs a high level, and the third operational amplifier OA3 controls the first power device Q1 to be turned on according to the high level signal, so as to quickly connect the electric device 200 into the power supply system.

Optionally, on the basis of the foregoing embodiment, with continued reference to fig. 4, the first power regulating circuit 20 further includes a tenth resistor R10 and a third capacitor C3, and the first control chip U1 further includes a second input trigger terminal 5, a first regulating terminal 6 and a second regulating terminal 7;

a first end of a tenth resistor R10 is connected to a first voltage VCC1, a second end of the tenth resistor R10 is electrically connected to a first end of a third capacitor C3, a second end of the third capacitor C3 is electrically connected to a second adjusting end 7 of the first control chip U1, and a first adjusting end 6 of the first control chip U1 is electrically connected to a second end of the tenth resistor R10;

the second adjusting terminal 7 of the first control chip U1 is electrically connected to the second input trigger terminal 5 of the first control chip U1.

Specifically, the tenth resistor R10 and the third capacitor C3 together form an RC adjusting circuit for adjusting the switching time of the high and low levels. For example, if the time parameter calculated by the values of the tenth resistor R10 and the third capacitor C3 is 3s, the level-flipping time interval of the first control chip U1 is 3s, when the level of the first input trigger terminal 1 of the first control chip U1 changes from high level to low level, the pulse output terminal 2 of the first control chip U1 outputs low level at the same time, after 3s, the first control chip U1 performs level flipping once, the pulse output terminal 2 outputs low level, and flips high level to the negative terminal of the fourth operational amplifier OA4, and the fourth operational amplifier OA4 outputs high level. If the self-recovery of the electric equipment is finished within 3s, the pulse output end 2 of the first control chip U1 always outputs a high level, the system normally operates, the first control circuit controls the conduction of the first power device Q1 after amplifying the current driving capability through the first triode Q2 according to the turn-on signal of the first power device Q1 of the high level output by the fourth operational amplifier OA4, and the electric equipment 200 is connected with the power supply equipment 100; if the self-recovery of the electric equipment 200 is not completed within 3s, the first power detection circuit 10 still outputs the turn-off signal of the first power device Q1 with the low level, the first input trigger terminal 1 of the first control chip U1 is changed from the high level to the low level again, and after the time interval of 3s, the low level output by the pulse output terminal 2 of the first control chip U1 is turned over to the high level until the first power detection circuit 10 outputs the high level, so that the smooth access of the electric equipment 200 to the power supply system is completed, and the electric safety of the electric equipment 200 is ensured.

Optionally, fig. 5 is a schematic structural diagram of another power protection circuit provided in an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 5, the power protection circuit further includes a second power detection circuit 40, a second power adjustment circuit 50, a second control circuit 60, and a second power device Q3, wherein a third pole of the second power device Q3 is electrically connected to a second pole of the first power device Q1, a second pole of the second power device Q3 is electrically connected to the input terminal of the electric device 200, and a first pole of the second power device Q3 is electrically connected to the output terminal F2 of the second control circuit 60.

Specifically, the first power detection circuit 10, the first power adjustment circuit 20, the first control circuit 30 and the first power device Q1 together form a primary protection circuit of the power protection circuit, and the second power detection circuit 40, the second power adjustment circuit 50, the second control circuit 60 and the second power device Q3 together form a secondary protection circuit of the power protection circuit. The secondary protection circuit is used for forming double protection on the power supply protection circuit so as to improve the safety and reliability of the power supply protection circuit. The secondary protection circuit and the primary protection circuit have the same circuit structure and devices, and have the same working principle and beneficial effect as the primary protection circuit, and are not described in detail herein.

Optionally, on the basis of the foregoing embodiment, with continued reference to fig. 5, the power protection circuit provided in the embodiment of the present invention further includes a first power indicator circuit 70, where the first power indicator circuit 70 includes an eleventh resistor R11 and a first indicator LED 1;

a first end of the eleventh resistor R11 is electrically connected with the output end of the power supply device 100, and a second end of the eleventh resistor R11 is grounded through the first indicator light LED 1;

the power supply circuit further comprises a second power indicator light circuit 80, wherein the second power indicator light circuit 80 comprises a twelfth resistor R12 and a second indicator light LED 2;

a first terminal of the twelfth resistor R12 is electrically connected to the input terminal of the powered device 200, and a second terminal of the twelfth resistor R12 is grounded through the second indicator light LED 2.

Specifically, when the power supply apparatus 100 is operating normally, the first indicator light LED1 is lit to indicate that the power supply apparatus 100 is in an operating state; when the electric device 200 operates normally, the first power device Q1 and the second power device Q2 are both turned on, and the second indicator light LED2 is lit to indicate that the electric device 200 is in a safe power utilization state.

The embodiment of the utility model provides a power protection circuit's concrete theory of operation as follows:

the embodiment of the utility model provides a power protection circuit can use in the power supply system that voltage is 10-60V to be connected between power supply unit 100 and consumer 200. The first power detection circuit 10 detects whether the power of the electric power equipment 200 exceeds the standard, when the current detection circuit 11 detects an overcurrent signal or the voltage detection circuit 12 detects an overvoltage signal, the first power detection circuit outputs a turn-off signal of the first power device Q1 with a low level, and the first control circuit 30 controls the first power device Q1 to turn off according to the turn-off signal of the first power device Q1, so that the power supply equipment 100 is disconnected from the electric power equipment 200. Meanwhile, the first power regulating circuit 20 outputs a low level at the pulse output terminal 2 of the first control chip U1 according to the turn-off signal of the first power device Q1, and since the low level is smaller than the reference voltage value, the fourth operational amplifier OA4 outputs a low level after comparison by the fourth operational amplifier OA 4. The level flip time of the first control chip U1 is set by the tenth resistor R10 and the third capacitor C3, and each time the level flip time elapses, the first control chip U1 will flip the low level output by the pulse output terminal 2 to the high level until the first input trigger terminal 1 receives the turn-on signal of the first power device Q1, which is output by the first power detection circuit 10 and has the high level. When the powered device 200 is recovered, the currents and voltages detected by the first and second operational amplifiers OA1 and OA2 are lower than the reference values, and thus the first and second operational amplifiers OA1 and OA2 output a high level. The first control circuit 30 compares the high level output by the first operational amplifier OA1 and the second operational amplifier OA2 with the reference voltage through the third operational amplifier OA3, and then outputs a high level driving signal for controlling the conduction of the first power device Q1, and amplifies the current driving capability of the driving signal through the first triode Q2, so as to ensure that the first power device Q1 can be completely conducted, and because the first power device Q1 is an IGBT semiconductor device, the switching speed is fast, so that the electric equipment 200 can be quickly connected into the power supply system. The second power detection circuit 40 detects the voltage output by the first power device Q1, and performs a secondary protection for the electric equipment 200 to prevent overvoltage and overcurrent.

The embodiment of the utility model provides a when detecting that the power of consumer exceeds standard or the short circuit through first power detection circuitry, turn off the signal according to excessive pressure or overcurrent signal generation first power device, first control circuit is according to the turn off signal control first power device and is shut off to cut off the electricity between consumer and the power supply unit; when the electric equipment recovers, the first power regulating circuit generates an opening signal of the first power device, the first control circuit conducts the first power device according to the opening signal, and the electric equipment is quickly connected into a power supply system to ensure the normal operation of the system. Meanwhile, a secondary protection circuit can be arranged, so that the situation that the primary protection circuit cannot completely remove faults when the power of the electric equipment exceeds the standard is prevented. The embodiment of the utility model provides a through with power protection circuit connection between power supply unit and consumer, can effectual protection power supply unit to monitoring consumer's power consumption safety, can realizing that the consumer is when short circuit or power surpass standard appearing, quick cutting off consumer and power supply unit's being connected, after the consumer self-resuming, can be in time quick insert power supply system with the consumer.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A power protection circuit, comprising: the power supply comprises a first power detection circuit, a first power regulation circuit, a first control circuit and a first power device;

the first power regulating circuit comprises a power supply input end and a signal output end, the power supply input end of the first power regulating circuit is connected with the first voltage, and the first power regulating circuit is used for generating an on signal of the first power device within preset time according to an off signal of the first power device and outputting the on signal from the signal output end of the first power device;

the first control circuit comprises an input end and an output end, the input end of the first control circuit is electrically connected with the signal output end of the first power detection circuit and the signal output end of the first power adjusting circuit respectively, and the output end of the first control circuit is electrically connected with the first power device.

2. The power protection circuit of claim 1, wherein the first power detection circuit comprises a current detection circuit comprising a first resistor, a second resistor, a third resistor, and a first op-amp;

3. The power protection circuit of claim 2, wherein the first power detection circuit further comprises a voltage detection circuit comprising a fourth resistor, a fifth resistor, a first capacitor, and a second operational amplifier;

4. The power protection circuit of claim 3, wherein the first control circuit comprises a sixth resistor and a third op-amp;

5. The power protection circuit according to claim 4, wherein the first control circuit further comprises a seventh resistor, an eighth resistor, a ninth resistor, a first triode, a second capacitor, and a first diode;

6. The power protection circuit of claim 4, wherein the first power regulating circuit comprises a fourth operational amplifier and a first control chip, the first control chip comprising a first input trigger terminal, a pulse output terminal, a power supply terminal and a ground terminal;

7. The power protection circuit of claim 6, wherein the first power regulating circuit further comprises a tenth resistor and a third capacitor, and the first control chip further comprises a second input trigger terminal, a first regulating terminal and a second regulating terminal;

8. The power protection circuit of claim 1, further comprising a second power detection circuit, a second power regulation circuit, a second control circuit, and a second power device, wherein a third pole of the second power device is electrically connected to a second pole of the first power device, the second pole of the second power device is electrically connected to the input of the powered device, and the first pole of the second power device is electrically connected to the output of the second control circuit.

9. The power protection circuit of claim 8, wherein a primary protection circuit of the power protection circuit comprises the first power detection circuit, the first power regulation circuit, the first control circuit, and the first power device;

10. The power protection circuit of claim 9, further comprising a first power indicator circuit comprising an eleventh resistor and a first indicator light;