CN215268057U - Switching power supply protection circuit and switching power supply - Google Patents
Switching power supply protection circuit and switching power supply Download PDFInfo
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- CN215268057U CN215268057U CN202120218297.4U CN202120218297U CN215268057U CN 215268057 U CN215268057 U CN 215268057U CN 202120218297 U CN202120218297 U CN 202120218297U CN 215268057 U CN215268057 U CN 215268057U
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Abstract
The embodiment of the utility model provides a relate to power technical field, disclose a switching power supply protection circuit and switching power supply. The circuit comprises: the device comprises an output switch module, a load voltage detection module, a control module and a dummy load module; the output end of the voltage transformation module is respectively connected with the output switch module and the dummy load module, and the control module is respectively connected with the output switch module, the load voltage detection module and the dummy load module; the output switch module is connected with a load; the load voltage detection module is used for detecting load input voltage and sending the load input voltage to the control module; and the control module is used for controlling the output switch module to be disconnected with the load and controlling the dummy load module to work so as to reduce the output voltage of the switching power supply when judging that the output voltage of the switching power supply is overvoltage according to the load input voltage. The embodiment of the utility model provides a simple structure can carry out overvoltage protection to switching power supply's output voltage.
Description
Technical Field
The embodiment of the utility model provides a relate to power technical field, concretely relates to switching power supply protection circuit and switching power supply.
Background
The switching power supply can convert alternating current into direct current and is generally used as a charger product. The switching power supply comprises a forward switching power supply and a flyback switching power supply.
Under the condition that the switching power supply is in no-load, the conduction duty ratio of a control switch of the switching power supply is small, so that the output voltage of the switching power supply is unstable and jump can occur. When the output voltage of the switching power supply abnormally rises, the output voltage may be made greater than the safe voltage of the electric equipment, so that the electric equipment is damaged. However, the inventor finds in the process of implementing the present invention that: in the related art, the switching power supply is subjected to overvoltage protection by arranging the two-stage control switch, and more components are needed, so that the overvoltage protection cost of the switching power supply is higher.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the embodiment of the utility model provides a switching power supply protection circuit and switching power supply can stabilize the output voltage of output power supply when empty and can carry out overvoltage protection.
According to the utility model discloses an aspect of the embodiment provides a switching power supply protection circuit, switching power supply includes the vary voltage module, the vary voltage module is used for providing output voltage, switching power supply is used for supplying power for the load, the circuit includes: the device comprises an output switch module, a load voltage detection module, a control module and a dummy load module;
the output end of the voltage transformation module is respectively connected with the output switch module and the dummy load module, and the control module is respectively connected with the output switch module, the load voltage detection module and the dummy load module; the output switch module is connected with the load;
the load voltage detection module is used for detecting load input voltage and sending the load input voltage to the control module;
and the control module is used for controlling the output switch module to be disconnected from the load and controlling the dummy load module to work so as to reduce the output voltage of the switching power supply when judging that the output voltage of the switching power supply is overvoltage according to the load input voltage.
In an optional manner, the control module is further configured to:
when the switching power supply is in no-load, the dummy load module is controlled to work through a level signal;
and when the switching power supply works normally, the dummy load module is controlled to not work through a level signal.
In an alternative form, the output switch module includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first switching tube and a second switching tube;
one end of the first resistor is respectively connected with the output end of the voltage transformation module and the input end of the first switch tube, and the other end of the first resistor is respectively connected with one end of the second resistor and the control end of the first switch tube;
the output end of the first switching tube is connected with the load;
the other end of the second resistor is connected with the input end of the second switching tube;
the output end of the second switch tube is grounded, and the control end of the second switch tube is respectively connected with one end of the third resistor and one end of the fourth resistor;
the other end of the third resistor is grounded;
the other end of the fourth resistor is connected with the first output end of the control module.
In an optional mode, the first switch tube is a PMOS tube, and the second switch tube is a triode.
In an optional manner, the load voltage detection module includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a third switching tube;
one end of the fifth resistor is connected with the second output end of the control module, and the other end of the fifth resistor is connected with the control end of the third switching tube;
one end of the seventh resistor is connected with the input end of the load, and the other end of the seventh resistor is connected with the input end of the third switching tube;
the output end of the third switching tube is connected with one end of the sixth resistor and one end of the eighth resistor respectively;
the other end of the sixth resistor is connected with the input end of the control module;
the other end of the eighth resistor is grounded.
In an optional mode, the third switching tube is a PMOS tube.
In an optional mode, the dummy load module comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourth switching tube;
one end of the ninth resistor is connected with the third output end of the control module, and the other end of the ninth resistor is respectively connected with the control end of the fourth switching tube and one end of the tenth resistor;
the other end of the tenth resistor is grounded;
the output end of the fourth switching tube is grounded, and the input end of the fourth switching tube is connected with one end of the eleventh resistor, one end of the twelfth resistor and one end of the thirteenth resistor respectively;
the other end of the eleventh resistor is connected with the other end of the twelfth resistor, the other end of the thirteenth resistor and the output end of the voltage transformation module respectively.
In an optional mode, the fourth switching tube is a triode.
According to an aspect of the embodiments of the present invention, there is provided a switching power supply including the above-described switching power supply protection circuit.
In an optional mode, the switching power supply further comprises a feedback module, a power chip and a voltage transformation module;
the output end of the voltage transformation module is respectively connected with the switching power supply protection circuit and the feedback module, and the input end of the voltage transformation module is connected with the power supply chip;
the voltage transformation module is used for providing output voltage for the switching power supply protection circuit;
the feedback module is used for collecting the output voltage and sending the output voltage to the power supply chip;
the power supply chip is used for adjusting the working mode of the voltage transformation module according to the output voltage.
The utility model discloses switching power supply protection circuit includes: the device comprises an output switch module, a load voltage detection module, a control module and a dummy load module; the load voltage detection module can detect load input voltage and send the load input voltage to the control module; the control module can control the output switch module to be disconnected with the load and control the dummy load module to work to reduce the output voltage of the switch power supply when judging that the output voltage of the switch power supply is overvoltage according to the load input voltage. The embodiment of the utility model provides a simple structure can carry out overvoltage protection to switching power supply's output voltage.
The utility model discloses control module basis when load input voltage judges switching power supply unloaded, control dummy load module work, can stabilize switching power supply's output voltage, when judging switching power supply normal work according to load input voltage, control dummy load module is out of work to avoid dummy load module to consume extra power, improve switching power supply's charge efficiency.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram illustrating a switching power supply according to an embodiment of the present invention;
fig. 2 is a block diagram illustrating another switching power supply according to an embodiment of the present invention;
fig. 3 shows a block diagram of a protection circuit of a switching power supply according to an embodiment of the present invention;
fig. 4 shows a circuit schematic diagram of a switching power supply provided by an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows a block diagram of a switching power supply according to an embodiment of the present invention. Referring to fig. 1, the switching power supply includes a switching power supply protection circuit 10, where the switching power supply protection circuit 10 is configured to stabilize an output voltage of the switching power supply when the switching power supply is idle, and perform overvoltage protection on the switching power supply when the output voltage of the switching power supply is overvoltage.
Fig. 2 shows a block diagram of another switching power supply according to an embodiment of the present invention. Referring to fig. 2, the switching power supply includes a switching power supply protection circuit 10, a feedback module 20, a power chip 30, and a voltage transformation module 40. The switching power supply protection circuit 10 is configured to stabilize an output voltage of the switching power supply when the switching power supply is idle, and perform overvoltage protection on the switching power supply when the output voltage of the switching power supply is overvoltage.
Wherein, the output end 42 of the voltage transformation module 40 is respectively connected with the switching power supply protection circuit 10 and the feedback module 20, and the input end 41 is connected with the power supply chip 30; the voltage transformation module 40 is used for providing an output voltage for the switching power supply protection circuit 10; the feedback module 20 is configured to collect an output voltage and send the output voltage to the power chip 30; the power chip 30 is used for adjusting the operation mode of the transformer module 40 according to the output voltage.
The utility model discloses switching power supply protection circuit can carry out the steady voltage to switching power supply's output voltage when switching power supply is unloaded through setting up switching power supply protection circuit, when switching power supply's output voltage is excessive pressure, carries out overvoltage protection to switching power supply.
The following is a description of the specific structure of the switching power supply protection circuit 10 in the above-described embodiment and its operation principle.
Fig. 3 shows a block diagram of a protection circuit of a switching power supply according to an embodiment of the present invention. The switching power supply protection circuit is applied to the switching power supply and is used for stabilizing the output voltage of the switching power supply when the switching power supply is in no-load and performing overvoltage protection on the switching power supply when the output voltage of the switching power supply is in overvoltage.
Referring to fig. 3, the switching power supply includes a voltage transformation module, the voltage transformation module is configured to provide an output voltage to the switching power supply protection circuit 10, the switching power supply is configured to supply power to a load, and the switching power supply protection circuit 10 includes: an output switch module 101, a dummy load module 102, a control module 103 and a load voltage detection module 104;
the output end of the voltage transformation module is respectively connected with the output switch module 101 and the dummy load module 102, the control module 103 is respectively connected with the output switch module 101, the load voltage detection module 104 and the dummy load module 102, and the output switch module 101 is connected with a load.
And the load voltage detection module 104 is configured to detect a load input voltage and send the load input voltage to the control module 103.
And the control module 103 is configured to, according to the load input voltage and when it is determined that the output voltage of the switching power supply is overvoltage, control the output switch module 101 to disconnect from the load, and control the dummy load module 102 to operate, so as to reduce the output voltage of the switching power supply.
The control module 103 is further configured to control the dummy load module 102 to operate when the no-load of the switching power supply is determined according to the load input voltage, and control the dummy load module 102 to not operate when the normal operation of the switching power supply is determined according to the load input voltage.
The utility model discloses switching power supply protection circuit includes: the device comprises an output switch module, a load voltage detection module, a control module and a dummy load module; the load voltage detection module can detect load input voltage and send the load input voltage to the control module; the control module can control the output switch module to be disconnected with the load and control the dummy load module to work to reduce the output voltage of the switch power supply when judging that the output voltage of the switch power supply is overvoltage according to the load input voltage. The embodiment of the utility model provides a simple structure can carry out overvoltage protection to switching power supply's output voltage.
Fig. 4 shows a schematic circuit diagram of a switching power supply according to an embodiment of the present invention. The utility model discloses switching power supply includes foretell switching power supply protection circuit.
Referring to fig. 4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, and a resistor R13 are respectively used to identify 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 ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor; the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are respectively used for identifying the first switching tube, the second switching tube, the third switching tube and the fourth switching tube.
The switching power supply protection circuit comprises an output switch module 101, a dummy load module 102, a control module 103 and a load voltage detection module 104. The switching power supply further comprises a transformation module 40, and the output end of the transformation module 40 is the positive end of the capacitor C2.
The control module 103 comprises a singlechip U1; the input end of the control module 103 is 13 pins of the singlechip U1, the first output end is 15 pins of the singlechip U1, the second output end is 14 pins of the singlechip U1, and the third output end is 6 pins of the singlechip U1.
The output switch module 101 includes: the resistor R1, the resistor R2, the resistor R3, the resistor R4, the switching tube Q1 and the switching tube Q2; the switch tube Q1 is a PMOS tube, the control end of the switch tube Q1 is a gate of the PMOS tube, the input end of the switch tube Q1 is a source of the PMOS tube, and the output end of the switch tube Q1 is a drain of the PMOS tube. The switch tube Q2 is a triode, the control end of the switch tube Q2 is the base b of the triode, the input end of the switch tube Q2 is the collector c of the triode, and the output end of the switch tube Q2 is the emitter e of the triode.
One end of the resistor R1 is connected to the output end of the transformer module and the source S of the switch tube Q1, and the other end is connected to one end of the resistor R2 and the gate G of the switch tube Q1; the drain D of the switching tube Q1 is connected with a load; the other end of the resistor R2 is connected with the collector c of the switching tube Q2; the emitter e of the switching tube Q2 is grounded, and the base b is respectively connected with one end of the resistor R3 and one end of the resistor R4; the other end of the resistor R3 is grounded; the other end of the resistor R4 is connected to the 15 pin of the control module 103.
The load voltage detection module 104 includes: the circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a switching tube Q3. The switch tube Q3 is a PMOS tube, the control end of the switch tube Q3 is a gate of the PMOS tube, the input end of the switch tube Q3 is a source of the PMOS tube, and the output end of the switch tube Q3 is a drain of the PMOS tube.
One end of the resistor R5 is connected to the 14 pin of the control module 103, and the other end is connected to the gate G of the switch tube Q3; one end of the resistor R7 is connected with the input end of the load, and the other end is connected with the source S of the switch tube Q3; the drain D of the switching tube Q3 is respectively connected with one end of the resistor R6 and one end of the resistor R8; the other end of the resistor R6 is connected with a pin 13 of the control module 103; the other end of the resistor R8 is connected to ground.
The dummy load module 102 includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, and a switch Q4. The switch tube Q4 is a triode, the control end of the switch tube Q2 is the base b of the triode, the input end of the switch tube Q2 is the collector c of the triode, and the output end of the switch tube Q2 is the emitter e of the triode.
One end of the resistor R9 is connected with the pin 6 of the control module 103, and the other end is respectively connected with the base b of the switch tube Q4 and one end of the resistor R10; the other end of the resistor R10 is grounded; an emitter e of the switching tube Q4 is grounded, and a collector c is respectively connected with one end of the resistor R11, one end of the resistor R12 and one end of the resistor R13; the other end of the resistor R11 is respectively connected with the other end of the resistor R12, the other end of the resistor R13 and the output end of the transformation module.
The following describes an external circuit of a switching power supply protection circuit in a switching power supply according to an embodiment of the present invention.
Vi is the ac input voltage of the switching power supply, and transformer T1 may convert Vi to an output voltage V3. D2 is a rectifying diode for rectifying the secondary voltage of the transformer T1. C2 is a filter diode for filtering the secondary voltage of transformer T1.
The resistor R14, the voltage stabilizing diode D3 and the optocoupler U3 are feedback circuits of the switching power supply. The power chip U2 is a PWM chip and is used for controlling the conduction duty ratio of the switching tube Q1 according to the sampling signal of the optocoupler U3, so that the output voltage V3 is adjusted. An FB pin of the power chip U2 is an input pin and is used for receiving a sampling signal of the optocoupler U3, and an OUT pin is an output pin and is used for outputting a control signal to control the conduction duty ratio of the switch tube Q1. The resistor R16, the capacitor C1 and the diode D1 form an absorption circuit for absorbing peak voltage, and the resistor R15 is a power resistor.
The working principle of the switching power protection circuit in the switching power supply of the present invention is explained below.
The single chip microcomputer U1 outputs high level through 14 pins to turn on the switching tube Q3, and the resistor R5 is used for controlling the grid current of the switching tube Q3. After the switching tube Q3 is turned on, the resistor R7 and the resistor R8 divide the input voltage Vout of the load. The singlechip U1 judges the voltage division value of the resistor R8 through the input current of the pin 13 and calculates the input voltage Vout of the load. Resistor R6 is used to eliminate current disturbances.
The singlechip U1 judges the working state of the switching power supply according to the input voltage Vout of the load. If the single chip microcomputer U1 judges that the switching power supply is in no-load according to the input voltage Vout of the load, a high level is output through the 6 pins, the switching tube Q4 is conducted, and therefore the resistor R11, the resistor R12 and the resistor R13 are grounded. The equivalent resistor formed by connecting the resistor R11, the resistor R12 and the resistor R13 in parallel is connected with the capacitor C2 in parallel, so that the output voltage V3 of the switching power supply can be stabilized.
If the single chip microcomputer U1 judges that the switching power supply normally works according to the input voltage Vout of the load, a low level is output through the 6 pins, and the switching tube Q4 is turned off, so that the resistor R11, the resistor R12 and the resistor R13 are not grounded any more, no current flows through the resistor R11, the resistor R12 and the resistor R13, power is not consumed, and the charging efficiency of the switching power supply can be improved.
If the single chip microcomputer U1 judges that the load is charged completely or judges that the output voltage V3 of the switching power supply is abnormally increased according to the input voltage Vout of the load, the single chip microcomputer U1 outputs a low level through a 15 pin to turn off the switching tube Q2, so that the switching tube Q1 is further turned off, and the switching power supply is disconnected with the load; meanwhile, the singlechip U1 outputs high level through 6 pins, so that the switch tube Q4 is switched on, and the resistor R11, the resistor R12 and the resistor R13 are grounded. If the output voltage V3 of the switching power supply abnormally rises, so that the switching tube Q1 fails, for example, the switching tube Q1 is broken down, the resistor R11, the resistor R12 and the resistor R13 are grounded, and the resistor R11, the resistor R12 and the resistor R13 have current flowing through, so that the input current of the load is shunted, the input current of the load is low, and the internal circuit of the switching power supply and the load are prevented from being damaged.
It should be noted that unless otherwise indicated, technical or scientific terms used in accordance with embodiments of the present invention shall have the ordinary meaning as understood by those skilled in the art to which embodiments of the present invention pertain.
In the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated on the drawings, which is only for convenience of describing the embodiments of the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the embodiments of the present invention.
Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the novel embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
In describing the novel embodiments of this embodiment, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A switching power supply protection circuit, the switching power supply including a voltage transformation module, the voltage transformation module being configured to provide an output voltage, the switching power supply being configured to supply power to a load, the circuit comprising: the device comprises an output switch module, a load voltage detection module, a control module and a dummy load module;
the output end of the voltage transformation module is respectively connected with the output switch module and the dummy load module, and the control module is respectively connected with the output switch module, the load voltage detection module and the dummy load module; the output switch module is connected with the load;
the load voltage detection module is used for detecting load input voltage and sending the load input voltage to the control module;
and the control module is used for controlling the output switch module to be disconnected from the load and controlling the dummy load module to work so as to reduce the output voltage of the switching power supply when judging that the output voltage of the switching power supply is overvoltage according to the load input voltage.
2. The switching power supply protection circuit according to claim 1, wherein the control module is further configured to:
when the switching power supply is in no-load, the dummy load module is controlled to work through a level signal;
and when the switching power supply works normally, the dummy load module is controlled to not work through a level signal.
3. The switching power supply protection circuit according to claim 1 or 2, wherein the output switch module includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first switching tube and a second switching tube;
one end of the first resistor is respectively connected with the output end of the voltage transformation module and the input end of the first switch tube, and the other end of the first resistor is respectively connected with one end of the second resistor and the control end of the first switch tube;
the output end of the first switching tube is connected with the load;
the other end of the second resistor is connected with the input end of the second switching tube;
the output end of the second switch tube is grounded, and the control end of the second switch tube is respectively connected with one end of the third resistor and one end of the fourth resistor;
the other end of the third resistor is grounded;
the other end of the fourth resistor is connected with the first output end of the control module.
4. The protection circuit of claim 3, wherein the first switch tube is a PMOS tube, and the second switch tube is a triode.
5. The switching power supply protection circuit according to claim 1 or 2, wherein the load voltage detection module comprises: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a third switching tube;
one end of the fifth resistor is connected with the second output end of the control module, and the other end of the fifth resistor is connected with the control end of the third switching tube;
one end of the seventh resistor is connected with the input end of the load, and the other end of the seventh resistor is connected with the input end of the third switching tube;
the output end of the third switching tube is connected with one end of the sixth resistor and one end of the eighth resistor respectively;
the other end of the sixth resistor is connected with the input end of the control module;
the other end of the eighth resistor is grounded.
6. The protection circuit of claim 5, wherein the third switch transistor is a PMOS transistor.
7. The switching power supply protection circuit according to claim 1 or 2, wherein the dummy load module comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourth switching tube;
one end of the ninth resistor is connected with the third output end of the control module, and the other end of the ninth resistor is respectively connected with the control end of the fourth switching tube and one end of the tenth resistor;
the other end of the tenth resistor is grounded;
the output end of the fourth switching tube is grounded, and the input end of the fourth switching tube is connected with one end of the eleventh resistor, one end of the twelfth resistor and one end of the thirteenth resistor respectively;
the other end of the eleventh resistor is connected with the other end of the twelfth resistor, the other end of the thirteenth resistor and the output end of the voltage transformation module respectively.
8. The switching power supply protection circuit according to claim 7, wherein the fourth switching tube is a triode.
9. A switching power supply characterized in that it comprises a switching power supply protection circuit according to any one of claims 1 to 8.
10. The switching power supply according to claim 9, further comprising a feedback module, a power chip and a voltage transformation module;
the output end of the voltage transformation module is respectively connected with the switching power supply protection circuit and the feedback module, and the input end of the voltage transformation module is connected with the power supply chip;
the voltage transformation module is used for providing output voltage for the switching power supply protection circuit;
the feedback module is used for collecting the output voltage and sending the output voltage to the power supply chip;
the power supply chip is used for adjusting the working mode of the voltage transformation module according to the output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120218297.4U CN215268057U (en) | 2021-01-26 | 2021-01-26 | Switching power supply protection circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120218297.4U CN215268057U (en) | 2021-01-26 | 2021-01-26 | Switching power supply protection circuit and switching power supply |
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| CN215268057U true CN215268057U (en) | 2021-12-21 |
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| CN202120218297.4U Active CN215268057U (en) | 2021-01-26 | 2021-01-26 | Switching power supply protection circuit and switching power supply |
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- 2021-01-26 CN CN202120218297.4U patent/CN215268057U/en active Active
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