CN-122001224-A - Power supply conversion device

Abstract

A power conversion device at least comprises a voltage converter, a resonant converter, a feedback circuit, an output circuit and a control gain circuit. The voltage converter is used for receiving the input differential voltage and converting the input differential voltage into a first relay voltage. And a resonant converter for converting the first relay voltage into a second relay voltage. The feedback circuit is coupled to the resonant converter via a feedback path. And the output circuit is used for generating an output voltage according to the output differential voltage. The control gain circuit is used for executing a control mechanism to adjust the first relay voltage and the output voltage. The voltage total gain of the power conversion device is related to a first ratio value of the output voltage to the input voltage, and the control gain circuit adjusts the voltage total gain according to a control mechanism.

Inventors

• CHEN ZHISHAN

Assignees

• 光宝科技股份有限公司

Dates

Publication Date

20260508

Application Date

20241108

Claims (20)

1. 1.A power conversion apparatus, comprising: a voltage converter for receiving an input differential voltage, wherein the input differential voltage is related to an input voltage of the power conversion device, and the voltage converter converts the input differential voltage into a first relay voltage; A resonant converter for converting the first relay voltage into a second relay voltage; a feedback circuit for receiving an output differential voltage, wherein the output differential voltage is indirectly related to the second relay voltage, and the feedback circuit is coupled to the resonant converter through a feedback path; An output circuit for generating an output voltage of the power conversion device according to the output differential voltage, and A control gain circuit for executing a control mechanism to adjust the first relay voltage and the output voltage, The power conversion device has a voltage total gain, the voltage total gain is related to a first ratio value of the output voltage and the input voltage, and the control gain circuit adjusts the voltage total gain according to the control mechanism.
2. 2. The power conversion device of claim 1, wherein the voltage converter performs a power factor correction, a step-up operation, or a step-down operation on the input differential voltage.
3. 3. The power conversion device of claim 1, wherein the resonant converter is an inductor-capacitor converter to implement a soft switching mechanism.
4. 4. The power conversion apparatus according to claim 1, further comprising: the first control circuit controls the voltage converter based on a gain control signal generated by the control gain circuit so that the voltage converter adjusts the first relay voltage.
5. 5. The power conversion apparatus according to claim 4, further comprising: A second control circuit, which is arranged on the feedback path and controls the resonant converter based on a monitoring result generated by the feedback circuit and the first relay voltage so as to enable the resonant converter to adjust the second relay voltage, The second control circuit generates a pulse width modulation signal based on the monitoring result and the first relay voltage, and controls the resonant converter through the pulse width modulation signal.
6. 6. The power conversion device of claim 5, wherein the first control circuit and the second control circuit are integrated into a control unit.
7. 7. The power conversion apparatus according to claim 5, further comprising: A coupling circuit arranged between the feedback circuit and the second control circuit, The feedback circuit is coupled to the resonant converter through the coupling circuit and the second control circuit, and the feedback circuit feeds back the monitoring result to the second control circuit through the coupling circuit.
8. 8. The power conversion device of claim 5, wherein the second control circuit is coupled to an over-temperature protection circuit, and the second control circuit comprises: an overcurrent protection circuit, and An overvoltage protection circuit.
9. 9. The power conversion device of claim 1, wherein the external control device is coupled to an external control device, and the external control device monitors the output differential voltage and generates a gain control signal, and performs a multiplication, a division, an addition, or a subtraction to adjust the first relay voltage and the output voltage according to the gain control signal.
10. 10. The power conversion device of claim 1, wherein the control gain circuit is a voltage control gain circuit that adjusts the first relay voltage, the output voltage and the overall voltage gain based on the output differential voltage.
11. 11. The power conversion device of claim 10, wherein the voltage control gain circuit adjusts the first relay voltage and the output voltage according to a multiplication or a division.
12. 12. The power conversion device of claim 11, wherein the voltage control gain circuit multiplies or divides the first relay voltage by a first multiplying factor and multiplies or divides the output voltage by a second multiplying factor.
13. 13. The power conversion device of claim 10, wherein the voltage control gain circuit adjusts the first relay voltage and the output voltage according to an addition or a subtraction.
14. 14. The power conversion device of claim 13, wherein the voltage control gain circuit adds or subtracts at least one first step from the first relay voltage and adds or subtracts at least one second step from the output voltage.
15. 15. The power conversion device of claim 5, wherein the control gain circuit is a current control gain circuit that adjusts the first relay voltage and the total voltage gain based on a sense current.
16. 16. The power conversion apparatus of claim 15, further comprising: A transformer having a primary side and a secondary side, wherein the primary side is coupled to the resonant converter and the transformer converts the second relay voltage into a third relay voltage, and A rectifier coupled to the secondary side of the transformer and generating the output differential voltage according to the third relay voltage, The second control circuit is coupled to the primary side of the transformer through the resonant converter, and the feedback circuit is coupled to two output ends of the rectifier to receive the output differential voltage.
17. 17. The power conversion device of claim 16, wherein the rectifier is a diode rectifier or a synchronous rectifier.
18. 18. The power conversion device of claim 16, wherein the sense current is associated with the primary side of the transformer, and the sense current is representative of a primary side load of the power conversion device.
19. 19. The power conversion device of claim 18, wherein the sense current is generated by the second control circuit, and the current control gain circuit receives and senses the sense current directly from the second control circuit.
20. 20. The power conversion apparatus of claim 16, further comprising: the current sensing circuit is arranged between the rectifier and the output circuit, generates the sensing current according to the output differential voltage, and the sensing current represents the output load of the power conversion device.

Description

Power supply conversion device Technical Field The present invention relates to a power conversion device, and more particularly, to a power conversion device capable of adjusting an output voltage and a total gain of the output voltage. Background The power system plays an indispensable key role in the development of emerging energy sources, and among various elements of the power system, the power conversion device has the most important key position. The power conversion means typically comprise a resonant converter and the resonant converter may be implemented by an inductor-capacitor (LLC) converter. In the prior art, the inductor-capacitor converter used in the power conversion device is usually applied to a fixed output voltage, and the power conversion device cannot change the output voltage thereof based on different operating conditions (such as different load conditions), thereby changing the total voltage gain. In other words, the power conversion device cannot change the output voltage, and thus lacks flexibility in application. In view of the foregoing, there is a need for an improved power conversion device that can adjust the output voltage and the overall voltage gain based on different load conditions. Disclosure of Invention According to an aspect of the present invention, there is provided a power conversion apparatus. The power conversion device at least comprises a voltage converter, a resonant converter, a feedback circuit, an output circuit and a control gain circuit. The voltage converter is used for receiving an input differential voltage, wherein the input differential voltage is related to the input voltage of the power conversion device, and the voltage converter converts the input differential voltage into a first relay voltage. The resonant converter is used for converting the first relay voltage into the second relay voltage. The feedback circuit receives an output differential voltage, wherein the output differential voltage is indirectly related to the second relay voltage, and the feedback circuit is coupled to the resonant converter via a feedback path. The output circuit is used for generating the output voltage of the power conversion device according to the output differential voltage. The control gain circuit executes a control mechanism to adjust the first relay voltage and the output voltage. The power conversion device has a voltage total gain, the voltage total gain is related to a first ratio value of the output voltage and the input voltage, and the control gain circuit adjusts the voltage total gain according to a control mechanism. Other aspects and advantages of the invention will become apparent upon review of the following drawings, detailed description, and claims. Drawings Fig. 1 is a circuit diagram of a power conversion device according to an embodiment of the invention. Fig. 2A to 2D are schematic diagrams illustrating different embodiments of the voltage control gain circuit of fig. 1 executing a control mechanism to adjust the first relay voltage and the output voltage. Fig. 3A is a circuit diagram of a power conversion device according to another embodiment of the invention. Fig. 3B is a circuit diagram of a power conversion device according to another embodiment of the present invention. Fig. 4 is a circuit diagram of a power conversion device according to still another embodiment of the present invention. Fig. 5A-1 through 5D-2 are schematic diagrams of different embodiments of the current control gain circuit of fig. 4 executing a control mechanism to adjust the first relay voltage. Fig. 6 is a circuit diagram of a power conversion device according to a further embodiment of the present invention. Fig. 7 is a schematic diagram of a lookup table referenced by the current control gain circuit of fig. 6. Symbol description: 1000,1000b,1000c,1010 b power supply conversion device 10 Input circuit 20 Output circuit 100 Voltage converter 200 Resonant converter 250 Transformer 300 Rectifier 400 Feedback circuit 450 Coupling circuit 500 Second control circuit 501 Control unit 510 Over-temperature protection circuit 600 Voltage control gain circuit 601 Control device 610 Current control gain circuit 700 First control circuit PS primary side SS secondary side Vi input voltage (Vi 1, vi 2) input differential Voltage Vb: first relay voltage Vb': second relay voltage Vb': third relay voltage (Vo 1, vo 2) outputting differential voltages Vo output voltage DR1 monitoring results PW1 pulse width modulation signal GC1, GC2, GC3 gain control signal C1, C2, C3 control signal A1, B1 ratio of multiplying power A2, B2 step diameter Is, is': sense current Total gain of voltage Detailed Description Technical terms in the present specification are terms commonly used in the art, and a part of the terms are described or defined as the present specification, and the explanation of the part of the terms is based on the description or the definition of the present specificati