CN112003241B - Overcurrent and overvoltage protection circuit for switching power supply - Google Patents
Overcurrent and overvoltage protection circuit for switching power supply Download PDFInfo
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- CN112003241B CN112003241B CN202010672977.3A CN202010672977A CN112003241B CN 112003241 B CN112003241 B CN 112003241B CN 202010672977 A CN202010672977 A CN 202010672977A CN 112003241 B CN112003241 B CN 112003241B
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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
- H02H7/1213—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 for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
Abstract
The invention discloses an overcurrent and overvoltage protection circuit for a switching power supply, which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, a first voltage-stabilizing diode, a first triode, a second triode, a third triode, a fourth triode, a first diode, a second diode and a transformer auxiliary winding, wherein the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the first capacitor, the second capacitor, the third capacitor, the first voltage-stabilizing diode, the second triode, the third triode, the fourth triode, the first diode, the second diode and the transformer auxiliary winding are connected in series; the overvoltage protection circuit has the advantages that a voltage detection circuit consisting of the auxiliary winding of the transformer, the second diode and the eighth resistor is used for triggering an output overvoltage protection signal of the power supply control chip; the output state of the switching power supply is locked by using a self-locking circuit consisting of a second triode, a third triode, a fourth resistor, a sixth resistor and a tenth resistor, so that the switching power supply is protected; the first triode and the tenth resistor are used for realizing the purposes of overcurrent detection and overvoltage detection and dividing according to periods, the first NMOS tube carries out overcurrent detection when being conducted, and the first NMOS tube carries out overvoltage detection after being turned off.
Description
Technical Field
The invention relates to a switching power supply, in particular to an overcurrent and overvoltage protection circuit for the switching power supply.
Background
In the design process of industrial electronic products, the design and application of single-output type switching power supplies and multi-output type switching power supplies are very wide. In an industrial environment, the switching power supply is easily subjected to large interference, single-path or multi-path load output is influenced, and when the load has the conditions of voltage unbalance, overvoltage, overcurrent, short circuit and the like, the switching power supply and the load can be damaged. In order to solve the technical problem, overcurrent and overvoltage protection needs to be carried out on the switching power supply, which is a core technical problem of the design of the switching power supply.
The existing switching power supply with the overcurrent and overvoltage protection function is mostly a switching power supply module integrated with an overcurrent and overvoltage protection circuit, however, the switching power supply module is high in price and difficult to purchase, and certain problems also exist in stability and reliability, so that the traditional switching power supply is still adopted in many application occasions, and the overcurrent and overvoltage protection circuit for the traditional switching power supply is necessary to be researched.
Disclosure of Invention
The invention aims to solve the technical problem of providing an overcurrent and overvoltage protection circuit for a switching power supply, which can protect a load and the switching power supply when the load has the conditions of voltage imbalance, overvoltage, overcurrent, short circuit and the like, has low price and high stability and reliability, and can be used for the traditional switching power supply.
The technical scheme adopted by the invention for solving the technical problems is as follows: an overcurrent and overvoltage protection circuit for a switching power supply, characterized in that: the high-voltage power supply comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, a first voltage-stabilizing diode, a first triode, a second triode, a third triode, a fourth triode, a first diode, a second diode and a transformer auxiliary winding, wherein one end of the first resistor is connected with an input power supply, the other end of the first resistor is respectively connected with one end of the first capacitor, the anode of the second capacitor, the cathode of the first voltage-stabilizing diode, the emitter of the second triode, one end of the fourth resistor and the power supply end of a power control chip in a switching power supply, the anode of the first voltage-stabilizing diode is respectively connected with the emitter of the first triode, the collector of the second triode and the base of the third triode, the collector of the first triode is connected with one end of the third resistor, the other end of the third resistor is respectively connected with the emitter of the third triode, one end of the third capacitor, one end of the sixth resistor and the current detection end of the power control chip in the switching power supply, the base of the second triode is respectively connected with the other end of the fourth resistor and the collector of the third triode, the base of the first triode is connected with one end of the fifth resistor, the other end of the fifth resistor is respectively connected with one end of the second resistor, the anode of the first diode and the base of the fourth triode, and the other end of the second resistor is connected with the output end of the power control chip in the switching power supply, the cathode of the first diode is connected with the emitter of the fourth triode, one end of the seventh resistor and a switch tube in an input module in the switching power supply respectively, the other end of the sixth resistor is connected with a current sampling end of the input module in the switching power supply, one end of the eighth resistor is connected with the cathode of the first voltage stabilizing diode, the other end of the eighth resistor is connected with the cathode of the second diode, the anode of the second diode is connected with one end of the transformer auxiliary winding, and the other end of the first capacitor, the cathode of the second capacitor, the other end of the third capacitor, the collector of the fourth triode, the other end of the seventh resistor and the other end of the transformer auxiliary winding are all connected with the input side ground of the switching power supply.
The second resistor, the seventh resistor, the fourth triode and the first diode form a driving circuit for driving a switching tube in an input module in the switching power supply.
And the auxiliary winding of the transformer, the eighth resistor and the second diode form a voltage detection circuit.
The input power supply is 10-18V. In the specific implementation, 16V is adopted.
The first triode, the second triode and the fourth triode are all PNP triodes, and the third triode is an NPN triode.
The switching power supply comprises a power supply control chip, an input module and an output module, wherein the power supply control chip with current sampling is adopted, the input module consists of a ninth resistor, a tenth resistor, a fourth capacitor, a fifth capacitor, a third diode, a first NMOS (N-channel metal oxide semiconductor) tube, a transformer and a transformer primary, the output module consists of a plurality of output parts, each output part consists of an eleventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a fourth diode, a transient suppression diode and a transformer secondary, the first NMOS tube is used as a switching tube in the input module, one end of the fourth capacitor, one end of the ninth resistor and one end of the fifth capacitor are respectively connected with one end of the transformer primary, the common connecting end of the fifth capacitor is connected with a bus power supply, the other end of the fourth capacitor is connected with the input side of the switching power supply, the other end of the ninth resistor is connected with the other end of the fifth capacitor, the common connecting end of the fifth capacitor is connected with the cathode of the third diode, the common connecting end of the third resistor is connected with the anode connecting end of the first diode, the second connecting end of the first NMOS tube is connected with the emitter of the first diode, the first diode of the first NMOS tube, the second resistor is connected with the emitter of the first diode, the emitter of the first NMOS tube is connected with the emitter of the first diode, the second resistor is connected with the emitter of the first resistor, the cathode of the fourth diode is respectively connected with one end of the sixth capacitor, one end of the seventh capacitor, the anode of the eighth capacitor, one end of the transient suppression diode and one end of the eleventh resistor, the common connection end of the fourth diode is connected with a switching power supply output side power supply (+ 5V), the other end of the secondary pole of the transformer, the other end of the sixth capacitor, the other end of the seventh capacitor, the cathode of the eighth capacitor, the other end of the transient suppression diode and the other end of the eleventh resistor are connected, and the common connection end of the fourth diode is connected with the switching power supply output side ground.
The model of power control chip be UC2844AD8, power control chip's 7 th foot be the feeder ear, power control chip's 6 th foot be the output, power control chip's 3 rd foot be the current detection end, power control chip's 5 th foot be the earthing terminal. The peripheral circuits of the 1 st pin, the 2 nd pin, the 8 th pin and the 4 th pin of the power control chip directly adopt the existing peripheral circuits of the pins of the power control chip.
Compared with the prior art, the invention has the advantages that:
1) Triggering an output overcurrent protection signal of the power supply control chip by using a sampling resistor, namely a tenth resistor, and a current detection end of the power supply control chip; and a voltage detection circuit consisting of the auxiliary winding of the transformer, a second diode and an eighth resistor is used for triggering an output overvoltage protection signal of the power supply control chip.
2) And a self-locking circuit consisting of a second triode, a third triode, a fourth resistor, a sixth resistor and a tenth resistor is utilized to lock the output state of the switching power supply and protect the switching power supply.
3) The first triode and the tenth resistor are used for realizing the purposes of overcurrent detection and overvoltage detection and dividing according to periods, the first NMOS tube carries out overcurrent detection when being conducted, and the first NMOS tube carries out overvoltage detection after being turned off.
4) The first NMOS tube can be quickly turned off by utilizing the first diode, the fourth triode and the seventh resistor, so that the protection response speed of the load is improved, the protection response time of the load is shortened, and the effect of quickly protecting the switching power supply is achieved.
5) The overcurrent and overvoltage protection circuit can be used on switching power supplies such as BUCK, BOOST, flyback and forward.
6) The overcurrent and overvoltage protection circuit is low in price, and high in stability and reliability.
Drawings
Fig. 1 is a circuit diagram of an overcurrent and overvoltage protection circuit used in a switching power supply according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the following examples of the drawings.
As shown in fig. 1, the switching power supply includes a power control chip U1, an Input module Input and an Output module Output, the power control chip U1 is an existing power control chip with current sampling, the Input module Input includes a ninth resistor R9, a tenth resistor R10, a fourth capacitor C4, a fifth capacitor C5, a third diode D3, a first NMOS transistor K1, a transformer T1 and a transformer primary TC1, the Output module Output includes 4 Output portions SO (only a specific circuit of the Output portion SO of 1 is shown in fig. 1, and specific circuit structures of other 3 Output portions are the same), each Output portion SO includes an eleventh resistor R11, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a fourth diode D4, a transient suppressor TVS1 and a transformer secondary TC2, the first NMOS transistor K1 serves as a switching tube in the Input module Input, one end of a fourth capacitor C4, one end of a ninth resistor R9 and one end of a fifth capacitor C5 are respectively connected with one end of a transformer primary TC1, the common connection end of the first capacitor C4 is connected with a bus power supply UZK, the other end of the fourth capacitor C4 is connected with a ground GND on the Input side of a switching power supply, the other end of the ninth resistor R9 is connected with the other end of the fifth capacitor C5, the common connection end of the ninth capacitor C is connected with the cathode of a third diode D3, the anode of the third diode D3 is respectively connected with the other end of the transformer primary TC1 and the drain electrode of a first NMOS tube K1, the source electrode of the first NMOS tube K1 is connected with the ground GND on the Input side of the switching power supply through a tenth resistor R10, the connection end of the first NMOS tube K1 and the tenth resistor R10 is the current sampling end of an Input module Input, the gate electrode of the first NMOS tube K1 is connected with an over-current and over-voltage protection circuit, namely, the cathode of the first diode D1, the emitter of a fourth triode Q4 and the common connection end of a seventh resistor R7 in an over-voltage protection circuit, the anode of the fourth diode D4 is connected to one end of the transformer secondary TC2, the cathode of the fourth diode D4 is connected to one end of the sixth capacitor C6, one end of the seventh capacitor C7, the anode of the eighth capacitor C8, one end of the transient suppression diode TVS1, and one end of the eleventh resistor R11, respectively, and the common connection thereof is connected to the switching power supply output side power supply (+ 5V), the other end of the transformer secondary, the other end of the sixth capacitor C6, the other end of the seventh capacitor C7, the cathode of the eighth capacitor C8, the other end of the transient suppression diode TVS1, and the other end of the eleventh resistor R11, and the common connection thereof is connected to the switching power supply output side ground GND-5V. The model of power control chip U1 is UC2844AD8, power control chip U1's 7 th foot is the feed end, power control chip U1's 6 th foot is the output, power control chip U1's 3 rd foot is the current detection end, power control chip U1's 5 th foot is the earthing terminal, the peripheral circuit of this power control chip U1's 1 st foot, 2 nd foot, 8 th foot, 4 th foot directly adopts the peripheral circuit that these several feet have now of this power control chip U1.
The invention provides an overcurrent and overvoltage protection circuit for a switching power supply, as shown in figure 1, which comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first voltage-stabilizing diode Z1, a first triode Q1, a second triode Q2, a third triode Q3, a fourth triode Q4, a first diode D1, a second diode D2 and a transformer auxiliary winding TC3, wherein one end of the first resistor R1 is connected with an input power supply VCC1, the other end of the first resistor R1 is respectively connected with one end of the first capacitor C1, the anode of the second capacitor C2, the cathode of the first voltage-stabilizing diode Z1, the emitter of the second triode Q2, one end of the fourth resistor R4 and the power supply end of a power supply control chip U1 in the switching power supply, the anode of the first voltage-stabilizing diode Z1 is respectively connected with the emitting electrode of the first triode Q1, the collecting electrode of the second triode Q2 and the base electrode of the third triode Q3, the collecting electrode of the first triode Q1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with the emitting electrode of the third triode Q3, one end of a third capacitor C3, one end of a sixth resistor R6 and the current detection end of a power control chip U1 in the switching power supply, the base electrode of the second triode Q2 is respectively connected with the other end of a fourth resistor R4 and the collecting electrode of the third triode Q3, the base electrode of the first triode Q1 is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is respectively connected with one end of the second resistor R2, the anode of the first diode D1 and the base electrode of the fourth triode Q4, the other end of the second resistor R2 is connected with the output end of the power control chip U1 in the switching power supply, the cathode of the first diode D1 is connected to the emitter of the fourth triode Q4, one end of the seventh resistor R7, and a switching tube in the Input module Input of the switching power supply, the other end of the sixth resistor R6 is connected to the current sampling end of the Input module Input of the switching power supply, one end of the eighth resistor R8 is connected to the cathode of the first voltage-regulator diode Z1, the other end of the eighth resistor R8 is connected to the cathode of the second diode D2, the anode of the second diode D2 is connected to one end of the transformer auxiliary winding TC3, the other end of the first capacitor C1, the cathode of the second capacitor C2, the other end of the third capacitor C3, the collector of the fourth triode Q4, the other end of the seventh resistor R7, and the other end of the transformer auxiliary winding TC3 are all connected to the GND on the Input side of the switching power supply.
In this embodiment, the second resistor R2, the seventh resistor R7, the fourth transistor Q4, and the first diode D1 constitute a driving circuit for driving the switching tube in the Input module Input of the switching power supply.
In this embodiment, the transformer auxiliary winding TC3, the eighth resistor R8, and the second diode D2 constitute a voltage detection circuit.
In the present embodiment, the voltage of the input power VCC1 is 10 to 18V. In the specific implementation, 16V is adopted.
In this embodiment, the first transistor Q1, the second transistor Q2, and the fourth transistor Q4 are PNP transistors, and the third transistor Q3 is an NPN transistor.
When the conditions of overcurrent and short circuit occur in a single-path or multi-path load, namely the current of winding resistance of a secondary TC2 of a transformer in a certain path of output part SO becomes larger, in the conduction stage of a first NMOS tube K1, the current of the primary TC1 of the transformer flowing through the first NMOS tube K1 is increased, SO that the voltage on a tenth resistor R10, namely a sampling resistor, is raised, the threshold value of a 3 rd pin (current detection end) of a power supply control chip U1 is reached, a 6 th pin (output end) of the power supply control chip U1 is triggered to output a low level, the first NMOS tube K1 is turned off in advance by using a first diode D1, a fourth triode Q4 and a seventh resistor R7, and a switching power supply is switched into a protection state by hiccup.
When the single-path or multi-path load has overvoltage and unbalanced voltage, namely the secondary TC2 of the transformer in the output part SO of a certain path has overhigh winding voltage, at the turn-off stage of the first NMOS tube K1, the auxiliary winding TC3 of the transformer senses voltage higher than that of the first voltage-stabilizing diode Z1, the first voltage-stabilizing diode Z1 is broken down, and as the base electrode of the first triode Q1 and the output level of the 6 th pin (output end) of the power control chip U1 are the same as low level at this time, the first triode Q1 is in a conducting state, current flows through the third resistor R3, the sixth resistor R6 and the tenth resistor R10, the voltage rise of the 3 rd pin (current detection end) of the power control chip U1 reaches a threshold value, the 6 th pin (output end) of the power control chip U1 is triggered to output and maintain the low level, and the first NMOS tube K1 is turned off. At this time, the anode of the first voltage regulator diode Z1 is at a high level, a high-level self-locking circuit composed of the second triode Q2, the third triode Q3 and the fourth resistor R4 is activated, that is, after the anode of the first voltage regulator diode Z1 triggers the high level, the third triode Q3 is in a stable on state, at this time, current flows through the sixth resistor R6 and the tenth resistor R10, the voltage of the 3 rd pin (current detection end) of the power control chip U1 is locked at the high level, the first NMOS transistor K1 is locked at an off state, and the protection state is switched.
And (4) eliminating the problems until the power grid and the load are recovered to be normal, restarting the switching power supply, exiting the protection state and recovering the normal work.
Claims (6)
1. An overcurrent and overvoltage protection circuit for a switching power supply, characterized in that: the high-voltage power supply comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, a first voltage stabilizing diode, a first triode, a second triode, a third triode, a fourth triode, a first diode, a second diode and a transformer auxiliary winding, wherein one end of the first resistor is connected with an input power supply, the other end of the first resistor is respectively connected with one end of the first capacitor, the anode of the second capacitor, the cathode of the first voltage stabilizing diode, the emitter of the second triode, one end of the fourth resistor and the power supply end of a power control chip in a switching power supply, the anode of the first voltage stabilizing diode is respectively connected with the emitter of the first triode, the collector of the second triode and the base of the third triode, the collector of the first triode is connected with one end of the third resistor, the other end of the third resistor is respectively connected with the emitter of the third triode, one end of the third capacitor, one end of the sixth resistor and the current detection end of the power control chip in the switching power supply, the base of the second triode is respectively connected with the other end of the fourth resistor and the collector of the third triode, the base of the first triode is connected with one end of the fifth resistor, the other end of the fifth resistor is respectively connected with one end of the second resistor, the anode of the first diode and the base of the fourth triode, and the other end of the second resistor is connected with the output end of the power control chip in the switching power supply, the cathode of the first diode is connected with the emitter of the fourth triode, one end of the seventh resistor and a switching tube in an input module in the switching power supply respectively, the other end of the sixth resistor is connected with a current sampling end of the input module in the switching power supply, one end of the eighth resistor is connected with the cathode of the first voltage-stabilizing diode, the other end of the eighth resistor is connected with the cathode of the second diode, the anode of the second diode is connected with one end of the transformer auxiliary winding, and the other end of the first capacitor, the cathode of the second capacitor, the other end of the third capacitor, the collector of the fourth triode, the other end of the seventh resistor and the other end of the transformer auxiliary winding are all connected with the input side ground of the switching power supply;
the switching power supply comprises a power supply control chip, an input module and an output module, wherein the power supply control chip is provided with a current sampling power supply, the input module consists of a ninth resistor, a tenth resistor, a fourth capacitor, a fifth capacitor, a third diode, a first NMOS tube, a transformer and a transformer primary, the output module consists of a plurality of output parts, each output part consists of an eleventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a fourth diode, a transient suppression diode and a transformer secondary, the first NMOS tube is used as a switching tube in the input module, one end of the fourth capacitor, one end of the ninth resistor and one end of the fifth capacitor are respectively connected with one end of the transformer primary, the common connection end of the first capacitor is connected with a bus power supply, the other end of the fourth capacitor is connected with the input side of the switching power supply, the other end of the ninth resistor is connected with the other end of the fifth capacitor, the common connection end of the ninth resistor is connected with the cathode of the third diode, the other end of the first diode is connected with the anode of the first diode, the first diode is connected with the emitter of the first NMOS tube, the first diode is connected with the first diode, the first diode is connected with the emitter of the first diode, the first diode is connected with the first diode, the cathode of the fourth diode is respectively connected with one end of the sixth capacitor, one end of the seventh capacitor, the anode of the eighth capacitor, one end of the transient suppression diode and one end of the eleventh resistor, the common connection of the cathodes of the fourth diode and the anodes of the eighth capacitor, the common connection of the cathodes of the transient suppression diode and the eleventh resistor is connected with a switching power supply output side power supply, the other end of the transformer secondary, the other end of the sixth capacitor, the other end of the seventh capacitor, the cathode of the eighth capacitor, the other end of the transient suppression diode and the other end of the eleventh resistor are connected, and the common connection of the cathodes of the fourth diode and the eleventh resistor is connected with a switching power supply output side ground.
2. An overcurrent and overvoltage protection circuit for a switching power supply according to claim 1, wherein: the second resistor, the seventh resistor, the fourth triode and the first diode form a driving circuit for driving a switching tube in an input module in the switching power supply.
3. An overcurrent and overvoltage protection circuit for a switching power supply according to claim 1, wherein: and the auxiliary winding of the transformer, the eighth resistor and the second diode form a voltage detection circuit.
4. The over-current and over-voltage protection circuit for the switching power supply according to claim 1, wherein: the input power supply is 10 to 18V.
5. The over-current and over-voltage protection circuit for the switching power supply according to claim 1, wherein: the first triode, the second triode and the fourth triode are all PNP triodes, and the third triode is an NPN triode.
6. An overcurrent and overvoltage protection circuit for a switching power supply according to claim 1, wherein: the model of power control chip be UC2844AD8, power control chip's 7 th foot be the feed end, power control chip's 6 th foot be the output, power control chip's 3 rd foot be the current detection end, power control chip's 5 th foot be the earthing terminal.
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| CN112003241A (en) | 2020-11-27 |
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