CN115207881A - Power output protection circuit - Google Patents

Power output protection circuit Download PDF

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Publication number
CN115207881A
CN115207881A CN202210806245.8A CN202210806245A CN115207881A CN 115207881 A CN115207881 A CN 115207881A CN 202210806245 A CN202210806245 A CN 202210806245A CN 115207881 A CN115207881 A CN 115207881A
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CN
China
Prior art keywords
voltage
resistor
circuit
output end
drop unit
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Pending
Application number
CN202210806245.8A
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Chinese (zh)
Inventor
刘卫平
黄晓波
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Shenzhen First Semiconductor Co ltd
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Shenzhen First Semiconductor Co ltd
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Application filed by Shenzhen First Semiconductor Co ltd filed Critical Shenzhen First Semiconductor Co ltd
Priority to CN202210806245.8A priority Critical patent/CN115207881A/en
Publication of CN115207881A publication Critical patent/CN115207881A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1203—Circuits independent of the type of conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Voltage And Current In General (AREA)

Abstract

The invention provides a power output protection circuit which comprises an anode output end, a cathode output end, a loop compensation circuit, a precise voltage stabilizing circuit, a first voltage division circuit, a second voltage division circuit, a first resistor, a voltage drop unit, a first diode and a switch tube electrically connected with the cathode output end. The positive output end is connected with the negative output end through the loop compensation circuit and the voltage drop unit in sequence, the positive output end is connected with the switch tube through the first voltage division circuit in sequence, the positive output end is connected with the voltage output end of the second voltage division circuit through the first resistor and the first diode in sequence, the negative output end is connected with the switch tube through the second voltage division circuit, the voltage output end of the second voltage division circuit is further electrically connected with the loop compensation circuit and the precise voltage stabilizing circuit respectively, and the precise voltage stabilizing circuit is electrically connected with the first resistor, the first diode, the loop compensation circuit and the voltage drop unit respectively. When the power output end is short-circuited, the short-circuit current is reduced, and the impact of the short-circuit current on the component is prevented.

Description

Power output protection circuit
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of power modules, in particular to a power output protection circuit.
[ background of the invention ]
At present, the short-circuit protection of its power output of current low-voltage high-power circuit generally adopts hiccup mode, and is concrete, and during power output end short circuit, the electric current increases, and control chip control PWM output duty cycle reduces to 0 and realizes the output and shuts off, resets when reaching next chip duty cycle, continues the output, if still short circuit, then control chip controls PWM output duty cycle again and reduces to 0 and realize the output and shut off. This power output hiccup formula's short-circuit protection mode, the electric current of short circuit is too big during short-circuit protection, and then can lead to the complete machine loss big, and can cause the complete machine device to receive the impact of stress, leads to the device to damage even to influence the use of whole power, the reliability is poor.
Accordingly, there is a need for improvement and development in the art.
[ summary of the invention ]
The invention aims to provide a power output protection circuit which is used for solving the problem of poor reliability caused by too large current when short circuit is carried out in a hiccup mode in the short-circuit protection of the power output of the existing low-voltage high-power circuit.
The technical scheme of the invention is as follows: a power output protection circuit comprises an anode output end, a cathode output end, a loop compensation circuit, a precise voltage stabilizing circuit, a first voltage division circuit, a second voltage division circuit, a first resistor, a voltage drop unit, a first diode and a switch tube electrically connected with the cathode output end;
the voltage output end of the second voltage division circuit is respectively and electrically connected with the loop compensation circuit and the precise voltage stabilizing circuit, and the precise voltage stabilizing circuit is respectively and electrically connected with the first resistor, the first diode, the loop compensation circuit and the voltage drop unit;
when the positive output end and the negative output end are not short-circuited, the precise voltage stabilizing circuit is used for outputting a calibration voltage, the positive output end forms a first voltage according to a first resistance voltage drop and a first diode clamp, the switch tube is conducted based on the voltage output end of the first voltage dividing circuit and the first voltage, and the loop compensating circuit outputs a feedback voltage based on the first voltage;
when the positive output end and the negative output end are in short circuit, the switch tube is disconnected based on the voltage input by the negative output end, and the loop compensation circuit outputs feedback voltage based on the voltage of the voltage drop unit connected with the precision voltage stabilizing circuit in parallel.
Furthermore, the loop compensation circuit comprises an optical coupler, a twelfth resistor and a first voltage-stabilizing source, wherein the output end of the positive electrode is connected with the voltage drop unit after sequentially passing through the input end of the optical coupler, the twelfth resistor and the first voltage-stabilizing source, and the reference end of the first voltage-stabilizing source is respectively connected with the positive electrode of the first diode, the voltage output end of the second voltage-dividing circuit and the input end of the precise voltage-stabilizing circuit.
Furthermore, the first voltage division circuit comprises a second resistor and a third resistor, the switching tube is a triode, the positive output end is connected with an emitting electrode of the triode through the second resistor and the third resistor in sequence, and the output end of the second resistor is connected with a base electrode of the triode.
Furthermore, the second voltage division circuit comprises a fourth resistor and a fifth resistor, the negative electrode output end is connected with the collector electrode of the triode through the fifth resistor and the fourth resistor in sequence, and the input end of the fourth resistor is electrically connected with the reference end of the first voltage stabilizing source.
Furthermore, the voltage drop unit comprises three sixth resistors connected in parallel, one end of the voltage drop unit is electrically connected with the output ends of the precision voltage stabilizing circuit and the first voltage stabilizing source respectively, and the other end of the voltage drop unit is electrically connected with the negative electrode output end and the fifth resistor respectively.
Furthermore, the precision voltage stabilizing circuit comprises a seventh resistor, a second voltage stabilizing source, an eighth resistor and a ninth resistor, wherein the cathode of the second voltage stabilizing source is connected with the reference end of the first voltage stabilizing source through the seventh resistor, the cathode of the second voltage stabilizing source is sequentially connected with the voltage drop unit through the eighth resistor and the ninth resistor, the anode of the second voltage stabilizing source is respectively and electrically connected with the anode of the first voltage stabilizing source and the voltage drop unit, and the output end of the eighth resistor is connected with the reference end of the first voltage stabilizing source.
Furthermore, the power output protection circuit further comprises a first capacitor and a second capacitor, the positive electrode output end is connected with the voltage drop unit through the second capacitor, and the cathode of the second voltage stabilizing source is connected with the output end of the second capacitor through the first capacitor.
Furthermore, the power output protection circuit further comprises a tenth resistor, and the cathode of the second voltage-stabilizing source is connected with the cathode of the first diode through the tenth resistor.
Furthermore, the loop compensation circuit further comprises a third capacitor and an eleventh resistor, and the output end of the twelfth resistor is connected with the reference end of the first voltage-stabilizing source through the third capacitor and the eleventh resistor in sequence.
Further, the loop compensation circuit further includes a thirteenth resistor, and the thirteenth resistor is connected in parallel with the input end of the optocoupler.
The invention has the beneficial effects that: compared with the prior art, the voltage sampling circuit has the advantages that the first voltage division circuit, the second voltage division circuit, the switch tube, the voltage drop unit, the precise voltage stabilizing circuit, the first resistor and the first diode are configured, so that when the power output end outputs normally, the voltage of the voltage output end can be adjusted by the loop compensation circuit according to the voltage sampling. When the output end of the power supply is in short circuit, the switch tube is disconnected based on the voltage input by the negative output end, the voltage fed back to the power supply management chip by the loop compensation circuit is changed by the second voltage after the voltage drop unit is connected with the precise voltage stabilizing circuit in parallel, and at the moment, the power supply management chip adjusts the duty ratio of the output power switch to be 0 according to the feedback voltage, so that no voltage is output by the transformer. And when short circuit occurs, the short-circuit current can be reduced and the circuit loss can be reduced through the first voltage division circuit and the second voltage division circuit, so that the impact of short-circuit large current on components can be prevented, the damage of the components during short circuit can be prevented, and the reliability of the whole circuit can be improved.
[ description of the drawings ]
Fig. 1 is a schematic diagram of the circuit of the present invention.
[ detailed description ] A
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1, a power output protection circuit according to an embodiment of the present invention is shown.
The power output protection circuit comprises a positive electrode output end V +, a negative electrode output end V-, a loop compensation circuit 1, a precise voltage stabilizing circuit 5, a first voltage division circuit 2, a second voltage division circuit 3, a first resistor R3, a voltage drop unit 4, a first diode W1 and a switch tube Q8 electrically connected with the negative electrode output end V-. The positive output end V + is sequentially connected with the negative output end V-through the loop compensation circuit 1 and the voltage drop unit 4, the positive output end V + is sequentially connected with the switch tube Q8 through the first voltage division circuit 2, the positive output end V + is sequentially connected with the voltage output end of the second voltage division circuit 3 through the first resistor R3 and the first diode W1, the negative output end V-is connected with the switch tube Q8 through the second voltage division circuit 3, the voltage output end of the second voltage division circuit 3 is further respectively electrically connected with the loop compensation circuit 1 and the precise voltage stabilizing circuit 5, and the precise voltage stabilizing circuit 5 is respectively electrically connected with the first resistor, the first diode W1, the loop compensation circuit 1 and the voltage drop unit 4.
The power output end is a positive output end V + and a negative output end V-, and when the power is normally output, namely the positive output end V + and the negative output end V-are not short-circuited, the precise voltage stabilizing circuit 5 is used for outputting a calibration voltage. The calibration voltage is used as a reference voltage, and the voltage on the positive output end V + forms a first voltage after being subjected to voltage drop by a first resistor and clamped by a first diode W1. And the switching tube Q8 is turned on based on the voltage output end of the first voltage division circuit 2 and the condition that the first voltage reaches the on state, that is, the first voltage is the sampling voltage of the loop compensation circuit 1, the loop compensation circuit 1 outputs the feedback voltage to the power management chip of the switching power supply based on the first voltage, and the power management chip controls the duty ratio of the power switching tube Q8 according to the feedback voltage to realize the adjustment of the voltage output by the transformer, that is, the voltage at the positive output end V + can be stabilized. Here, the voltage drop unit 4 compensates the feedback voltage of the circuit 1 through the voltage drop adjustment loop when the power output terminal normally outputs.
When the power output end is in short circuit, namely the positive output end V + and the negative output end V-are in short circuit, the switch tube Q8 is disconnected based on the voltage input by the negative output end V-, the voltage fed back to the power management chip by the loop compensation circuit 1 is changed by the second voltage after the voltage drop unit 4 and the precise voltage stabilizing circuit 5 are connected in parallel, and at the moment, the power management chip adjusts the duty ratio of the output power switch to 0 according to the feedback voltage, so that the transformer has no voltage output. And when short circuit occurs, the short-circuit current can be reduced and the circuit loss can be reduced through the first voltage division circuit 2 and the second voltage division circuit 3, so that the impact of short-circuit large current on components can be prevented, the damage of the components during short circuit can be prevented, and the reliability of the whole circuit can be improved. Furthermore, the problem of poor reliability caused by too large current in short circuit of the conventional short-circuit protection of the power supply output of the low-voltage high-power circuit in a hiccup mode can be solved.
Specifically, in an embodiment, the loop compensation circuit 1 includes an optical coupler U1A, a twelfth resistor R6, and a first voltage regulator U2, the positive output terminal V + sequentially passes through the input terminal of the optical coupler U1A, the twelfth resistor R6, and the first voltage regulator U2 and then is connected to the voltage drop unit 4, and the reference terminal of the first voltage regulator U2 is respectively connected to the positive electrode of the first diode W1, the voltage output terminal of the second voltage regulator circuit 3, and the input terminal of the precision voltage regulator circuit 5. The output voltage is adjusted by using the voltage input by the reference end of the first voltage-stabilizing source U2, the current passing through the optical coupler U1A can be adjusted by matching with the twelfth resistor R6, and further, the brightness of a light-emitting diode in the optical coupler U1A can be adjusted by using the voltage of the reference end of the first voltage-stabilizing source U2, so that the voltage for the power management chip can be adjusted.
In addition, the loop compensation circuit 1 further comprises a third capacitor C6 and an eleventh resistor R11, an output end of the twelfth resistor R6 is connected with a reference end of the first voltage-stabilizing source U2 through the third capacitor C6 and the eleventh resistor R11 in sequence, and the third capacitor C6 and the eleventh resistor R11 can be used for accelerating the response speed of an amplifier inside the first voltage-stabilizing source U2, so that feedback voltage can be output to the power management chip in time.
The loop compensation circuit 1 further comprises a thirteenth resistor R4, the thirteenth resistor R4 is connected with the input end of the optical coupler U1A in parallel, and the thirteenth resistor R4 is utilized to improve the anti-interference performance of the optical coupler U1A and prevent the optical coupler from being conducted mistakenly.
The first voltage division circuit 2 comprises a second resistor R57 and a third resistor R58, the switch tube Q8 is a triode, the positive output end V + is connected with the emitting electrode of the triode through the second resistor R57 and the third resistor R58 in sequence, the output end of the second resistor R57 is connected with the base electrode of the triode, and the emitting electrode of the triode is electrically connected with the negative output end V-.
The second voltage division circuit 3 comprises a fourth resistor R56 and a fifth resistor R21, a negative electrode output end V-is sequentially connected with a collector electrode of the triode through the fifth resistor R21 and the fourth resistor R56, and an input end of the fourth resistor R56 is electrically connected with a reference end of the first voltage stabilizing source U2.
Therefore, when the positive output end V + and the negative output end V-are normally output, the voltage of the positive output end V + is divided by the second resistor R57 and the third resistor R58 to provide driving voltage for the triode, and the triode can be conducted by matching with the first voltage to provide the first voltage for the reference end of the first voltage regulator U2, so that the feedback voltage output to the power management chip can be adjusted.
And when the positive output end V + and the negative output end V-are short-circuited, the output voltage obtained by voltage division of the second resistor R57 and the third resistor R58 is compared with the output voltage obtained by voltage division of the fourth resistor R56 and the fifth resistor R21, so that the short-circuited current is reduced.
Specifically, the voltage drop unit 4 includes three sixth resistors R17 connected in parallel, one end of the voltage drop unit 4 is electrically connected to the precision voltage stabilizing circuit 5 and the output end of the first voltage stabilizing source U2, the other end of the voltage drop unit 4 is electrically connected to the negative output terminal V-and the fifth resistor R21, and the voltage drop is realized by using the three sixth resistors R17 connected in parallel.
The precise voltage stabilizing circuit 5 comprises a seventh resistor R7, a second voltage stabilizing source U3, an eighth resistor R9, a tenth resistor R5 and a ninth resistor R12, wherein the cathode of the second voltage stabilizing source U3 is connected with the reference end of the first voltage stabilizing source U2 through the seventh resistor R7, the cathode of the second voltage stabilizing source U3 is sequentially connected with the voltage drop unit 4 through the eighth resistor R9 and the ninth resistor R12, the anode of the second voltage stabilizing source U3 is respectively and electrically connected with the anode of the first voltage stabilizing source U2 and the voltage drop unit 4, the cathode of the second voltage stabilizing source U3 is connected with the cathode of the first diode W1 through the tenth resistor R5, and the output end of the eighth resistor R9 is connected with the reference end of the first voltage stabilizing source U2. Specifically, the seventh resistor R7 is used for limiting current, and the eighth resistor R9 and the ninth resistor R12 are used for adjusting the voltage output by the second regulator U3.
The power output protection circuit further comprises a first capacitor C8 and a second capacitor C5, the positive electrode output end V + is connected with the voltage drop unit 4 through the second capacitor C5, and the cathode of the second voltage-stabilizing source U3 is connected with the output end of the second capacitor C5 through the first capacitor C8. By utilizing the first capacitor C8 and the second capacitor C5, power can be supplied to other circuits to realize respective functions when short circuit occurs.
The power output protection circuit further comprises a filter capacitor, the anode of the first voltage-stabilizing source U2 is grounded through the filter capacitor CY1, and a second diode D17 is connected in series between the fourth resistor R56 and the collector of the triode.
In an embodiment, the eighth resistor R9 and the ninth resistor R12 have the same resistance, so that the output end of the precision voltage stabilizing circuit 5 stably outputs a voltage of 5V as the calibration voltage.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (10)

1. A power output protection circuit is characterized by comprising an anode output end, a cathode output end, a loop compensation circuit, a precise voltage stabilizing circuit, a first voltage division circuit, a second voltage division circuit, a first resistor, a voltage drop unit, a first diode and a switch tube electrically connected with the cathode output end;
the voltage output end of the second divider circuit is respectively and electrically connected with the loop compensation circuit and the precise voltage stabilizing circuit, and the precise voltage stabilizing circuit is respectively and electrically connected with the first resistor, the first diode, the loop compensation circuit and the voltage drop unit;
when the positive output end and the negative output end are not short-circuited, the precise voltage stabilizing circuit is used for outputting a calibration voltage, the voltage of the positive output end forms a first voltage according to a first resistance voltage drop and the clamping of a first diode, the switch tube is conducted based on the voltage output end of the first voltage dividing circuit and the first voltage, and the loop compensating circuit outputs a feedback voltage based on the first voltage;
when the positive output end and the negative output end are in short circuit, the switch tube is disconnected based on the voltage input by the negative output end, and the loop compensation circuit outputs feedback voltage based on the voltage of the voltage drop unit connected with the precision voltage stabilizing circuit in parallel.
2. The power output protection circuit of claim 1, wherein the loop compensation circuit comprises an optical coupler, a twelfth resistor and a first voltage-stabilizing source, the anode output end sequentially passes through the input end of the optical coupler, the twelfth resistor and the first voltage-stabilizing source and then is connected with the voltage drop unit, and the reference end of the first voltage-stabilizing source is respectively connected with the anode of the first diode, the voltage output end of the second voltage-dividing circuit and the input end of the precise voltage-stabilizing circuit.
3. The power output protection circuit according to claim 2, wherein the first voltage divider circuit includes a second resistor and a third resistor, the switch tube is a triode, the positive output terminal is connected to an emitter of the triode through the second resistor and the third resistor in sequence, and an output terminal of the second resistor is connected to a base of the triode.
4. A power output protection circuit as claimed in claim 3, wherein the second voltage divider circuit comprises a fourth resistor and a fifth resistor, the negative output terminal is connected to the collector of the triode via the fifth resistor and the fourth resistor in sequence, and the input terminal of the fourth resistor is electrically connected to the reference terminal of the first voltage regulator.
5. The power output protection circuit according to claim 4, wherein the voltage drop unit comprises three sixth resistors connected in parallel, one end of the voltage drop unit is electrically connected to the output ends of the precision voltage stabilizing circuit and the first voltage stabilizing source respectively, and the other end of the voltage drop unit is electrically connected to the negative output end and the fifth resistor respectively.
6. The power output protection circuit according to claim 5, wherein the precision voltage regulator circuit comprises a seventh resistor, a second voltage regulator source, an eighth resistor and a ninth resistor, a cathode of the second voltage regulator source is connected with the reference terminal of the first voltage regulator source through the seventh resistor, a cathode of the second voltage regulator source is connected with the voltage drop unit through the eighth resistor and the ninth resistor in sequence, an anode of the second voltage regulator source is electrically connected with an anode of the first voltage regulator source and the voltage drop unit respectively, and an output terminal of the eighth resistor is connected with the reference terminal of the first voltage regulator source.
7. The power output protection circuit according to claim 6, further comprising a first capacitor and a second capacitor, wherein the positive output terminal is connected to the voltage drop unit through the second capacitor, and the cathode of the second regulator is connected to the output terminal of the second capacitor through the first capacitor.
8. The power supply output protection circuit as claimed in claim 7, further comprising a tenth resistor, wherein the cathode of the second regulator is connected to the cathode of the first diode via the tenth resistor.
9. The power output protection circuit of claim 8, wherein the loop compensation circuit further comprises a third capacitor and an eleventh resistor, and an output terminal of the twelfth resistor is connected to the reference terminal of the first regulator through the third capacitor and the eleventh resistor in sequence.
10. The power supply output protection circuit of claim 9, wherein the loop compensation circuit further comprises a thirteenth resistor connected in parallel with the input of the optocoupler.
CN202210806245.8A 2022-07-08 2022-07-08 Power output protection circuit Pending CN115207881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210806245.8A CN115207881A (en) 2022-07-08 2022-07-08 Power output protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210806245.8A CN115207881A (en) 2022-07-08 2022-07-08 Power output protection circuit

Publications (1)

Publication Number Publication Date
CN115207881A true CN115207881A (en) 2022-10-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210806245.8A Pending CN115207881A (en) 2022-07-08 2022-07-08 Power output protection circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116528429A (en) * 2023-05-18 2023-08-01 珠海市圣昌电子有限公司 Rapid short-circuit protection method for LED dimming power supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116528429A (en) * 2023-05-18 2023-08-01 珠海市圣昌电子有限公司 Rapid short-circuit protection method for LED dimming power supply
CN116528429B (en) * 2023-05-18 2024-01-05 珠海市圣昌电子有限公司 Rapid short-circuit protection method for LED dimming power supply

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