CN220291871U - Rated ring temperature drop power circuit - Google Patents
Rated ring temperature drop power circuit Download PDFInfo
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- CN220291871U CN220291871U CN202321822477.9U CN202321822477U CN220291871U CN 220291871 U CN220291871 U CN 220291871U CN 202321822477 U CN202321822477 U CN 202321822477U CN 220291871 U CN220291871 U CN 220291871U
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- 238000001914 filtration Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 67
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 description 11
- 230000032683 aging Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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Abstract
The utility model discloses a rated ring temperature reduction power circuit, which relates to the field of power regulation and comprises: the topology switch power supply output module is used for receiving the control of the switch power supply chip and outputting voltage; the rectification filter output module is used for rectifying and filtering the voltage and outputting the voltage to the electric equipment; the output feedback module is used for sampling the output voltage, obtaining feedback voltage after processing, and outputting the feedback voltage to the FB pin of the switching power supply chip; the power-down module is used for adjusting the feedback voltage of the output feedback module along with the temperature change; compared with the prior art, the utility model has the beneficial effects that: the utility model is an analog circuit, and automatically reduces the power under the condition that the high temperature of the switching power supply cannot meet the full load, thereby achieving the preset effect of the product; compared with a singlechip control circuit, the circuit is simple and has low cost.
Description
Technical Field
The utility model relates to the field of power regulation, in particular to a rated ring temperature reduction power circuit.
Background
In the products of different topology switch power supplies, high-low temperature aging test is often needed. However, when the product is subjected to safety high-temperature test, the environmental temperatures of different products are different, and the electrical characteristics of the product are required to be tested within a certain time at a certain high temperature. If full power cannot be achieved, power reduction is required, and the requirements of safety regulations are met.
The function of the switching power supply chip is generally not achieved, the digital singlechip is used for control, the cost is increased greatly, and improvement is needed.
Disclosure of Invention
The utility model aims to provide a rated ring temperature reduction power circuit to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a rated loop temperature-reduced power circuit comprising:
the topology switch power supply output module is used for receiving the control of the switch power supply chip and outputting voltage;
the rectification filter output module is used for rectifying and filtering the voltage and outputting the voltage to the electric equipment;
the output feedback module is used for sampling the output voltage, obtaining feedback voltage after processing, and outputting the feedback voltage to the FB pin of the switching power supply chip;
the power-down module is used for adjusting the feedback voltage of the output feedback module along with the temperature change;
the topology switch power supply output module is connected with the rectification filter output module and the power reduction module, the rectification filter output module is connected with the output feedback module, the power reduction module is connected with the output feedback module, and the output feedback module is connected with the topology switch power supply output module.
As still further aspects of the utility model: the rectification filter output module comprises a capacitor C3, a diode D2, a resistor R8, a capacitor C2, a capacitor C7, a resistor R12, an inductor L1 and a capacitor C8, wherein the anode of the diode D2 is connected with one end of the capacitor C3, the first end of the output side of the transformer T1 is grounded, the second end of the output side of the transformer T1 is grounded, the cathode of the diode D2 is connected with one end of the resistor R8, one end of the capacitor C2, one end of the capacitor C7, one end of the resistor R12, one end of the inductor L1 and an output feedback module, the other end of the capacitor C3 is connected with the other end of the resistor R8, the other end of the capacitor C2 is grounded, the other end of the resistor R12 is grounded, the other end of the inductor L1 is connected with one end of the capacitor C8, electric equipment and the other end of the capacitor C8 is grounded.
As still further aspects of the utility model: the output feedback module comprises a resistor R6, a resistor R10, a resistor R4, a capacitor C1, a resistor R2, a controllable precise voltage stabilizing source U1, a resistor R15, an optocoupler U2, a resistor R5, a resistor R1 and a resistor R3, wherein one end of the resistor R10 is connected with one end of the resistor R6 and the rectifying and filtering output module, the other end of the resistor R10 is connected with one end of the resistor R2, one end of the resistor R15, a reference electrode of the controllable precise voltage stabilizing source U1 and a power reducing module, the other end of the resistor R15 is grounded, the positive electrode of the controllable precise voltage stabilizing source U1 is grounded, the other end of the resistor R2 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the negative electrode of the controllable precise voltage stabilizing source U1, one end of the resistor R4 and the second end of the optocoupler U2, the first end of the optocoupler U2 is connected with the other end of the resistor R4, the fourth end of the optocoupler U2 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with a power supply voltage VCC, the first end of the third end of the optocoupler U2 is connected with one end of the resistor R1, and the other end of the resistor R3 is connected with the other end of the resistor FB 1 is grounded.
As still further aspects of the utility model: the power reduction module comprises a diode D1, a resistor R7, a capacitor C9, a capacitor C6, a resistor R11, a resistor RT, a resistor R14, an amplifier U3, a diode D4, a capacitor C4, a resistor R9, a resistor R13 and a capacitor C1, wherein the positive electrode of the diode D1 is connected with the third end of the output side of the transformer T1, the fourth end of the output side of the transformer T1 is grounded, the negative electrode of the diode D1 is connected with one end of the resistor R7, the other end of the resistor R7 is connected with one end of the capacitor C9, one end of the capacitor C6, one end of the resistor R11 and one end of the resistor RT, the other end of the capacitor C9 is grounded, the other end of the resistor C6 is grounded, one end of the other end of the resistor R11 is connected with one end of the resistor R14, the same-phase end of the capacitor C4 and one end of the resistor R9, the other end of the resistor C4 is grounded, the other end of the resistor R9 is grounded, the other end of the resistor RT is connected with one end of the resistor C13, the other end of the resistor C1 is connected with the reverse end of the resistor U1, the other end of the resistor R13 is grounded, and the other end of the resistor R1 is connected with the positive electrode of the diode D4, and the negative electrode of the diode is connected with the output of the diode 3 is connected with the positive electrode of the diode D3.
As still further aspects of the utility model: resistor RT is a temperature sensitive resistor.
Compared with the prior art, the utility model has the beneficial effects that: the utility model is an analog circuit, and automatically reduces the power under the condition that the high temperature of the switching power supply cannot meet the full load, thereby achieving the preset effect of the product; compared with a singlechip control circuit, the circuit is simple and has low cost.
Drawings
Fig. 1 is a circuit diagram of a rated loop temperature reduced power circuit.
Description of the embodiments
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, a rated ring temperature down power circuit includes:
the topology switch power supply output module is used for receiving the control of the switch power supply chip and outputting voltage;
the rectification filter output module is used for rectifying and filtering the voltage and outputting the voltage to the electric equipment;
the output feedback module is used for sampling the output voltage, obtaining feedback voltage after processing, and outputting the feedback voltage to the FB pin of the switching power supply chip;
the power-down module is used for adjusting the feedback voltage of the output feedback module along with the temperature change;
the topology switch power supply output module is connected with the rectification filter output module and the power reduction module, the rectification filter output module is connected with the output feedback module, the power reduction module is connected with the output feedback module, and the output feedback module is connected with the topology switch power supply output module.
In particular embodiments: referring to fig. 1, the switching power supply chip is used to control whether the input side of the transformer T1 is turned on or not, further store electric energy on the primary coil and output the electric energy to the secondary coil, so as to output the electric energy, and the feedback voltage is output to the FB pin voltage of the switching power supply chip to change the turn-on frequency of the switching power supply chip control MOS tube (some chip MOS tubes are inside and some are outside), and control the voltage finally generated on the secondary coil, so as to construct a voltage stabilizing output.
In this embodiment: referring to fig. 1, the rectifying and filtering output module includes a capacitor C3, a diode D2, a resistor R8, a capacitor C2, a capacitor C7, a resistor R12, an inductor L1, and a capacitor C8, wherein the anode of the diode D2 is connected to one end of the capacitor C3, the first end of the output side of the transformer T1 is grounded, the second end of the output side of the transformer T1 is grounded, the cathode of the diode D2 is connected to one end of the resistor R8, one end of the capacitor C2, one end of the resistor R7, one end of the inductor L1, and an output feedback module, the other end of the capacitor C3 is connected to the other end of the resistor R8, the other end of the capacitor C2 is grounded, the other end of the resistor R12 is grounded, the other end of the inductor L1 is connected to one end of the capacitor C8, the electric device, and the other end of the capacitor C8 is grounded.
The voltage is rectified by a diode D2, a plurality of capacitors and inductors L1 are subjected to filtering treatment, and finally the output voltage (V0 in the figure) is supplied to electric equipment.
In this embodiment: referring to fig. 1, the output feedback module includes a resistor R6, a resistor R10, a resistor R4, a capacitor C1, a resistor R2, a controllable precision voltage stabilizing source U1, a resistor R15, an optocoupler U2, a resistor R5, a resistor R1, and a resistor R3, wherein one end of the resistor R10 is connected to one end of the resistor R6, the rectifying and filtering output module, the other end of the resistor R10 is connected to one end of the resistor R2, one end of the resistor R15, a reference electrode of the controllable precision voltage stabilizing source U1, a power-down module, the other end of the resistor R15 is grounded, the positive electrode of the controllable precision voltage stabilizing source U1 is grounded, the other end of the resistor R2 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the negative electrode of the controllable precision voltage stabilizing source U1, one end of the resistor R4, the second end of the optocoupler U2, the first end of the resistor R4 is connected to the other end of the resistor R6, the fourth end of the optocoupler U2 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the voltage, the other end of the third end of the optocoupler U2 is connected to the power supply pin of the resistor R3, and the other end of the resistor is connected to the other end of the resistor FB 1 is grounded.
The resistor R10 and the resistor R15 reflect the output voltage of the rectifying and filtering output module, the voltage on the resistor R15 is fed back to the controllable precise voltage stabilizing source U1 (model TL 431), and the reference electrode voltage and the negative electrode voltage of the controllable precise voltage stabilizing source U1 are inversely proportional in a certain voltage range, so that the current of the light emitting diode in the optocoupler U2 is changed according to the voltage on the resistor R15, and the voltage of the FB pin of the optocoupler U2 finally output to the switching power supply chip is changed.
In this embodiment: referring to fig. 1, the power reduction module includes a diode D1, a resistor R7, a capacitor C9, a capacitor C6, a resistor R11, a resistor RT, a resistor R14, an amplifier U3, a diode D4, a capacitor C4, a resistor R9, a resistor R13, and a capacitor C1, wherein a positive electrode of the diode D1 is connected to a third end of an output side of the transformer T1, a fourth end of the output side of the transformer T1 is grounded, a negative electrode of the diode D1 is connected to one end of the resistor R7, another end of the resistor R7 is connected to one end of the capacitor C9, one end of the capacitor C6, one end of the resistor R11, one end of the resistor RT, another end of the capacitor C9 is grounded, one end of the resistor R11, one end of the same phase of the capacitor C4, one end of the resistor R9, another end of the capacitor C4 is grounded, another end of the resistor R9 is grounded, another end of the resistor RT is connected to one end of the resistor R13, one end of the capacitor C1, another end of the reverse phase of the amplifier U1, another end of the resistor R13 is connected to the negative electrode of the resistor R13, another end of the other end of the resistor R13 is grounded, and another end of the negative electrode of the resistor 3 is connected to the positive electrode of the diode 4 is connected to the diode D4, and the positive electrode of the output end of the diode is connected to the diode D4 is grounded.
In this embodiment: referring to fig. 1, a resistor RT is a temperature sensitive resistor.
When the product is subjected to an ambient temperature rise test, full-load power passes through the negative temperature coefficient characteristic of the temperature sensitive resistor RT, namely the temperature sensitive resistor RT is closely attached to the diode D2 or a key element of the transformer T1, the in-phase terminal voltage of the amplifier U3 is set to be 2.5V along with the temperature rise and the resistance value reduction, namely R9/(R9+R11) Vc9=2.5V, the voltage of the U3 reverse-phase terminal is designed to be far smaller than 2.5V, namely R13/(RT+R13) Vc9< <2.5V, the set value is assumed to be equal to 0.4V, and the amplifier U3 is used as a comparator to output a high level at the moment, and the feedback circuit is not influenced due to the isolation of the diode D3. The temperature-sensitive resistor RT is increased along with the external temperature, the resistance value is reduced, the voltage of the inverting terminal of the amplifier U3 (the voltage on the resistor R13) is increased along with the increase, when the voltage is more than or equal to 2.5V, the amplifier U3 is inverted to be at a low level, and the reference electrode voltage of the controllable precise voltage-stabilizing source U1 is pulled down through the voltage-stabilizing tube D4 and the diode D3. The power output uo= (r10/r15+1) ×u1ref will be pulled low and the output power p=uo×io decreases. Thereby achieving the purpose of reducing power.
The working principle of the utility model is as follows: the topology switch power supply output module is used for receiving the control of the switch power supply chip and outputting voltage; the rectifying and filtering output module is used for rectifying and filtering the voltage and outputting the voltage to the electric equipment; the output feedback module is used for sampling the output voltage, obtaining feedback voltage after processing, and outputting the feedback voltage to the FB pin of the switching power supply chip; the power-down module is used for adjusting the feedback voltage of the output feedback module along with the temperature change.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A rated ring temperature drop power circuit is characterized in that:
the rated loop temperature drop power circuit comprises:
the topology switch power supply output module is used for receiving the control of the switch power supply chip and outputting voltage;
the rectification filter output module is used for rectifying and filtering the voltage and outputting the voltage to the electric equipment;
the output feedback module is used for sampling the output voltage, obtaining feedback voltage after processing, and outputting the feedback voltage to the FB pin of the switching power supply chip;
the power-down module is used for adjusting the feedback voltage of the output feedback module along with the temperature change;
the topology switch power supply output module is connected with the rectification filter output module and the power reduction module, the rectification filter output module is connected with the output feedback module, the power reduction module is connected with the output feedback module, and the output feedback module is connected with the topology switch power supply output module.
2. The rated loop temperature-decreasing power circuit according to claim 1, wherein the rectifying and filtering output module comprises a capacitor C3, a diode D2, a resistor R8, a capacitor C2, a capacitor C7, a resistor R12, an inductor L1, and a capacitor C8, wherein the positive electrode of the diode D2 is connected to one end of the capacitor C3, the first end of the output side of the transformer T1, the second end of the output side of the transformer T1 is grounded, the negative electrode of the diode D2 is connected to one end of the resistor R8, one end of the capacitor C2, one end of the capacitor C7, one end of the resistor R12, one end of the inductor L1, and an output feedback module, the other end of the capacitor C3 is connected to the other end of the resistor R8, the other end of the capacitor C2 is grounded, the other end of the resistor R12 is grounded, the other end of the inductor L1 is connected to one end of the capacitor C8, and the other end of the capacitor C8 is grounded.
3. The rated loop temperature-decreasing power circuit according to claim 1, wherein the output feedback module comprises a resistor R6, a resistor R10, a resistor R4, a capacitor C1, a resistor R2, a controllable precision voltage-stabilizing source U1, a resistor R15, an optocoupler U2, a resistor R5, a resistor R1, and a resistor R3, wherein one end of the resistor R10 is connected to one end of the resistor R6, the rectifying and filtering output module, the other end of the resistor R10 is connected to one end of the resistor R2, one end of the resistor R15, a reference electrode of the controllable precision voltage-stabilizing source U1, and a power-decreasing module, the other end of the resistor R15 is grounded, the positive electrode of the controllable precision voltage-stabilizing source U1 is grounded, the other end of the resistor R2 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the negative electrode of the controllable precision voltage-stabilizing source U1, one end of the resistor R4, the second end of the optocoupler U2, the first end of the optocoupler U2 is connected to the other end of the resistor R4, the other end of the resistor R6, the first end of the optocoupler U2 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the resistor R3, and the other end of the resistor is connected to the other end of the resistor R3.
4. The rated loop temperature-decreasing power circuit according to claim 1 or 3, wherein the power-decreasing module comprises a diode D1, a resistor R7, a capacitor C9, a capacitor C6, a resistor R11, a resistor RT, a resistor R14, an amplifier U3, a diode D4, a capacitor C4, a resistor R9, a resistor R13, a capacitor C1, a positive electrode of the diode D1 is connected to a third end of the output side of the transformer T1, a fourth end of the output side of the transformer T1 is grounded, a negative electrode of the diode D1 is connected to one end of the resistor R7, the other end of the resistor R7 is connected to one end of the capacitor C9, one end of the resistor R11, one end of the resistor RT is grounded, the other end of the capacitor C9 is grounded, the other end of the resistor R11 is connected to one end of the resistor R14, an in-phase end of the amplifier U3, one end of the capacitor C4, one end of the resistor R9, the other end of the resistor C4 is grounded, the other end of the resistor R9 is grounded, the other end of the resistor RT is connected to one end of the resistor RT 13, one end of the other end of the resistor C1 is connected to the negative electrode of the resistor C1, the other end of the resistor C4 is connected to the positive electrode of the diode is connected to the negative electrode of the diode 3, and the other end of the positive electrode of the amplifier is connected to the negative electrode of the diode 3 is connected to the positive end of the diode 3.
5. The circuit of claim 4, wherein the resistor RT is a temperature sensitive resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321822477.9U CN220291871U (en) | 2023-07-12 | 2023-07-12 | Rated ring temperature drop power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321822477.9U CN220291871U (en) | 2023-07-12 | 2023-07-12 | Rated ring temperature drop power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220291871U true CN220291871U (en) | 2024-01-02 |
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ID=89326159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321822477.9U Active CN220291871U (en) | 2023-07-12 | 2023-07-12 | Rated ring temperature drop power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220291871U (en) |
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2023
- 2023-07-12 CN CN202321822477.9U patent/CN220291871U/en active Active
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