CN217883228U - Automatic voltage reduction protection circuit for power supply temperature rise load output - Google Patents
Automatic voltage reduction protection circuit for power supply temperature rise load output Download PDFInfo
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- CN217883228U CN217883228U CN202221458473.2U CN202221458473U CN217883228U CN 217883228 U CN217883228 U CN 217883228U CN 202221458473 U CN202221458473 U CN 202221458473U CN 217883228 U CN217883228 U CN 217883228U
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Abstract
The utility model discloses a power supply temperature-rising load output automatic voltage-reducing protection circuit, which comprises a power supply input end, an output regulating circuit, a voltage-reducing protection circuit and a power supply output end; the power input end is connected with the adjusting output circuit, the adjusting output circuit is connected with the power output end, and the voltage reduction protection circuit is connected with the adjusting output circuit and the power output end. The utility model discloses a the beneficial effects are that: the circuit reduces the internal temperature of the power supply by reducing the output voltage, and prolongs the service life of power supply components.
Description
Technical Field
The utility model relates to a circuit field, specific theory involve an automatic protection circuit that steps down of power intensification load output.
Background
The switching power supply has the advantages of high efficiency, long service life, low static consumption and the like, and is widely applied to the industrial field. As the current of the output load increases, the power supply temperature of the switching power supply increases during use, and the service life of the switching power supply is shortened due to the fact that internal components of the power supply are too high in temperature.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a power supply heating load output automatic voltage reduction protection circuit, the circuit can reduce the internal temperature of the power supply by reducing the output voltage, and prolong the service life of power supply components.
The utility model provides a technical scheme that its technical problem adopted is: a power supply temperature-rising load output automatic voltage-reducing protection circuit comprises a power supply input end, an output regulating circuit, a voltage-reducing protection circuit and a power supply output end; the power input end is connected with the adjusting output circuit, the adjusting output circuit is connected with the power output end, and the voltage reduction protection circuit is connected with the adjusting output circuit and the power output end.
In the above structure, the step-down protection circuit includes a photocoupler U5, a three-terminal adjustable shunt reference source U3, and a thermistor NTC1; the collector of the photoelectric coupler U5 is connected with the output adjusting circuit, the emitter of the photoelectric coupler U5 is grounded, the anode of the photoelectric coupler U5 is connected with the reference pole of the three-terminal adjustable shunt reference source U3 through the thermistor NTC1, the cathode of the photoelectric coupler U5 is connected with the cathode of the three-terminal adjustable shunt reference source U3, and the anode of the three-terminal adjustable shunt reference source U3 is connected with the power output end.
In the structure, the output regulating circuit comprises a rectifier bridge DB1 and a power supply chip U1, the power supply input end is connected with the power supply chip U1 through the rectifier bridge DB1, and the power supply chip U1 is connected with the voltage reduction protection circuit and the power supply output end.
In the above structure, the step-down protection circuit further includes a resistor R41, a resistor R54, a resistor R29, a resistor R51, and a capacitor C20; the resistor R41 is arranged between the anode and the cathode of the photoelectric coupler U5, the capacitor C20 is arranged between the cathode of the photoelectric coupler U5 and the reference pole of the three-end adjustable shunt reference source U3, the resistor R54 and the resistor R29 are arranged between the anode of the photoelectric coupler U5 and the reference pole of the three-end adjustable shunt reference source U3, and the resistor R51 is arranged between the reference pole of the three-end adjustable shunt reference source U3 and the anode of the three-end adjustable shunt reference source U3.
In the structure, the model of the photocoupler U5 is EL-817C.
In the above structure, the three-terminal adjustable shunt reference source U3 has a model number TL431.
The beneficial effects of the utility model are that: the circuit reduces the internal temperature of the power supply by reducing the output voltage, and prolongs the service life of power supply components.
Drawings
FIG. 1 shows the utility model relates to a power supply heating load and outputting a circuit schematic diagram of the automatic voltage reduction protection circuit.
Fig. 2 is the circuit schematic diagram of a voltage-reducing protection circuit in the power supply temperature-rising load output automatic voltage-reducing protection circuit.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of them, based on the embodiments of the present invention, other embodiments obtained by persons skilled in the art without creative efforts belong to the protection scope of the invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. The utility model has various technical characteristics in the creation, the combination can be carried out interactively on the premise of not conflicting with each other.
Referring to fig. 1 to 2, the present invention discloses a power supply temperature-increasing load output automatic voltage-reducing protection circuit, which includes a power input terminal 10, an output regulating circuit 20, a voltage-reducing protection circuit 30 and a power output terminal 40; the power input end 10 is connected with the regulation output circuit 20, the regulation output circuit 20 is connected with the power output end 40, and the voltage reduction protection circuit 30 is connected with the regulation output circuit 20 and the power output end 40.
The output regulating circuit 20 comprises a rectifier bridge DB1 and a power supply chip U1, the power supply input end 10 is connected with the power supply chip U1 through the rectifier bridge DB1, and the power supply chip U1 is connected with the voltage reduction protection circuit 30 and the power supply output end 40.
The buck protection circuit 30 comprises a photoelectric coupler U5, a three-terminal adjustable shunt reference source U3 and a thermistor NTC1, wherein the photoelectric coupler U5 is EL-817C in model and is provided with four pins including an anode, a cathode, a collector and an emitter; the three-end adjustable shunt reference source U3 is TL431 and is provided with an anode, a cathode and a reference electrode; the collector of the photoelectric coupler U5 is connected with the power chip U1 in the switching power supply output regulating circuit 20, the emitter of the photoelectric coupler U5 is grounded, the anode of the photoelectric coupler U5 is connected with the reference pole of the three-terminal adjustable shunt reference source U3 through the thermistor NTC1, the cathode of the photoelectric coupler U5 is connected with the cathode of the three-terminal adjustable shunt reference source U3, and the anode of the three-terminal adjustable shunt reference source U3 is connected with the power output end 40.
The step-down protection circuit 30 further includes a resistor R41, a resistor R54, a resistor R29, a resistor R51 and a capacitor C20, the resistor R41 is disposed between the anode and the cathode of the photocoupler U5, the capacitor C20 is disposed between the cathode of the photocoupler U5 and the reference pole of the three-terminal adjustable shunt reference source U3, the resistor R54 and the resistor R29 are disposed between the anode of the photocoupler U5 and the reference pole of the three-terminal adjustable shunt reference source U3, and the resistor R51 is disposed between the reference pole of the three-terminal adjustable shunt reference source U3 and the anode of the three-terminal adjustable shunt reference source U3.
The transmission of the voltage of switching power supply output through rectifier bridge DB1 and power chip U1 among the output regulating circuit 20, the in-process of transmitting power output 40, the power is in long-time operating condition, the inside temperature of power can rise this moment, thermistor NTC 1's resistance can reduce, the voltage that voltage output adds step-down protection circuit 30 can rise, the electric current through photocoupler U5 can increase, the voltage of adjusting output circuit 20 output can reduce. Because the output voltage is reduced, the current of the output load is reduced, the internal temperature of the power supply is reduced, and the purpose of protecting the power supply and prolonging the service life is finally achieved.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (6)
1. A power supply temperature-rising load output automatic voltage-reducing protection circuit is characterized by comprising a power supply input end, an output regulating circuit, a voltage-reducing protection circuit and a power supply output end;
the power input end is connected with the adjusting output circuit, the adjusting output circuit is connected with the power output end, and the voltage reduction protection circuit is connected with the adjusting output circuit and the power output end.
2. The automatic power supply temperature-rising load output voltage-reducing protection circuit as claimed in claim 1, wherein the voltage-reducing protection circuit comprises a photocoupler U5, a three-terminal adjustable shunt reference source U3 and a thermistor NTC1;
the collector of the photoelectric coupler U5 is connected with the output regulating circuit, the emitter of the photoelectric coupler U5 is grounded, the anode of the photoelectric coupler U5 is connected with the reference electrode of the three-end adjustable shunt reference source U3 through the thermistor NTC1, the cathode of the photoelectric coupler U5 is connected with the cathode of the three-end adjustable shunt reference source U3, and the anode of the three-end adjustable shunt reference source U3 is connected with the power output end.
3. The automatic step-down protection circuit for power supply temperature-rising load output according to claim 1, wherein the output regulating circuit comprises a rectifier bridge DB1 and a power supply chip U1, a power supply input end is connected with the power supply chip U1 through the rectifier bridge DB1, and the power supply chip U1 is connected with the step-down protection circuit and a power supply output end.
4. The automatic power supply temperature-rising load output voltage-reducing protection circuit according to claim 2, wherein the voltage-reducing protection circuit further comprises a resistor R41, a resistor R54, a resistor R29, a resistor R51 and a capacitor C20;
the resistor R41 is arranged between the anode and the cathode of the photoelectric coupler U5, the capacitor C20 is arranged between the cathode of the photoelectric coupler U5 and the reference pole of the three-end adjustable shunt reference source U3, the resistor R54 and the resistor R29 are arranged between the anode of the photoelectric coupler U5 and the reference pole of the three-end adjustable shunt reference source U3, and the resistor R51 is arranged between the reference pole of the three-end adjustable shunt reference source U3 and the anode of the three-end adjustable shunt reference source U3.
5. The automatic power supply temperature-rising load output voltage-reducing protection circuit as claimed in claim 2, wherein the model of the photocoupler U5 is EL-817C.
6. The power supply temperature-rising load output automatic voltage-reducing protection circuit as claimed in claim 2, the three-end adjustable shunt reference source U3 is characterized in that the model number of the three-end adjustable shunt reference source U3 is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221458473.2U CN217883228U (en) | 2022-06-09 | 2022-06-09 | Automatic voltage reduction protection circuit for power supply temperature rise load output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221458473.2U CN217883228U (en) | 2022-06-09 | 2022-06-09 | Automatic voltage reduction protection circuit for power supply temperature rise load output |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217883228U true CN217883228U (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221458473.2U Active CN217883228U (en) | 2022-06-09 | 2022-06-09 | Automatic voltage reduction protection circuit for power supply temperature rise load output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217883228U (en) |
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2022
- 2022-06-09 CN CN202221458473.2U patent/CN217883228U/en active Active
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