A power supply circuit and an energy storage power supply
By combining feedback and compensation modules, the problem of uneven load capacity of auxiliary power supply was solved, and the output voltage of each isolated power supply module was stabilized and the load capacity was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN POWEROAK NEWENER CO LTD
- Filing Date
- 2025-04-01
- Publication Date
- 2026-06-19
AI Technical Summary
In the prior art, the load-carrying capacity of the auxiliary power supply is unbalanced. When the feedback circuit is set on one side, the load-carrying capacity of the isolation power supply on the other side is weak, resulting in a drop in power supply voltage and insufficient load-carrying capacity.
A combination of feedback module and compensation module is adopted. The feedback module receives the output voltage of the first isolation power supply module and provides a feedback signal to the main control module when it is lower than the preset value. The compensation module provides a feedback signal when the output voltage of the second isolation power supply module is lower than the preset value. The main control module adjusts the output voltage of the secondary winding of the transformer according to the feedback signal to maintain the output voltage stability of each isolation power supply module.
This ensures that the output voltage of each isolated power supply module is relatively stable, maintains a high load-carrying capacity, and avoids excessive adjustment of the output voltage of the transformer secondary winding.
Smart Images
Figure CN224385329U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of energy storage power technology, specifically to a power supply circuit and an energy storage power supply. Background Technology
[0002] In the design of mobile energy storage power supplies, power conversion typically includes a DC (Direct Current) section and an AC (Alternating Current) section. The DC section encompasses various low-voltage output circuits such as photovoltaic input and USB output circuits, cigarette lighter output circuits, and fast charging output circuits. The AC section includes high-voltage functional circuits such as AC input circuits, AC output circuits, and bypass output circuits. Maintaining electrical isolation between the AC and DC sections is a necessary safety measure. In related technologies, the AC and DC sections usually share a single auxiliary power transformer, which typically draws power from the DC section, supplying power to both the AC and DC circuits. Differences in the cross-regulation rates between different windings can lead to an imbalance in the auxiliary power supply's load-carrying capacity. Regardless of which side the feedback circuit used for stable output is located on, the other side's isolated power supply will have a weaker load-carrying capacity. For example, assuming the feedback circuit is located on the side of isolated power supply 1, if the load power required on the side of isolated power supply 1 is smaller than that on the side of isolated power supply 2, the voltage of the power supply on the side of isolated power supply 1 may drop, resulting in a weaker load-carrying capacity. Utility Model Content
[0003] The embodiments described in this application mainly address the technical problem of weak load-carrying capacity of some auxiliary power supplies in existing designs.
[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is as follows: a power supply circuit is provided, including a transformer, a first isolated power supply module connected to the transformer, at least one second isolated power supply module connected to the transformer, a feedback module, a main control module, and at least one compensation module. The feedback module is connected to the first isolated power supply module, the at least one compensation module is connected to the at least one second isolated power supply module in a one-to-one correspondence, and the main control module is connected to the at least one compensation module. The feedback module is used to receive a first output voltage from the first isolated power supply module and output a first feedback signal to the main control module when the first output voltage is less than a first preset value. The compensation module is used to obtain a second output voltage from the corresponding second isolated power supply module and output a second feedback signal to the main control module when the second output voltage is less than a second preset value. The main control module adjusts the secondary winding output voltage of the transformer in response to the first feedback signal and the second feedback signal.
[0005] In some embodiments, the compensation module includes an operational amplifier unit and an anti-reverse output unit. The operational amplifier unit is used to acquire the second output voltage of the corresponding connected second isolated power supply module, and when the second output voltage is less than a second preset value, it transmits a second feedback signal to the main control module in conjunction with the anti-reverse output unit, so that the main control module responds to the second feedback signal and increases the output voltage of the secondary winding of the transformer.
[0006] In some embodiments, the operational amplifier unit includes an operational amplifier U4, resistors R23 and R25, capacitor C10, resistors R22, R26, R27, and capacitor C11. Resistors R23 and R25 are connected in series, and resistors R22 and R26 are also connected in series. The first input terminal of the operational amplifier U4 is connected to a reference power supply through resistor R23, and the first input terminal of the operational amplifier U4 is also connected to a reference ground through resistor R25. The first terminal of capacitor C10 is connected to the first input terminal of the operational amplifier U4. The second terminal of capacitor C10 is connected to reference ground; the second input terminal of operational amplifier U4 is connected to the corresponding second isolated power supply module through resistor R22 to obtain the second output voltage of the second isolated power supply module; the second input terminal of operational amplifier U4 is also connected to reference ground through resistor R26; the second input terminal of operational amplifier U4 is connected to the output terminal of operational amplifier U4 through resistor R27; capacitor C11 is connected in parallel across resistor R27; the output terminal of operational amplifier U4 is connected to the main control module through the anti-reverse output unit.
[0007] In some embodiments, the anti-reverse output unit includes a diode D5 and a resistor R24. The anode of the diode D5 is connected to the output terminal of the operational amplifier U4, and the cathode of the diode D5 is connected to the main control module through the resistor R24.
[0008] In some embodiments, the operational amplifier unit further includes a filter capacitor C9, the first end of which is connected to the power supply terminal of the operational amplifier U4, and the second end of which is connected to a reference ground.
[0009] In some embodiments, the main control module includes a control unit and a power unit, the control unit including a main control chip; a first end of the power unit is connected to the secondary winding of the transformer, a second end of the power unit is connected to the detection pin of the main control chip, a control pin of the main control chip is connected to the control terminal of the power unit, and a feedback pin of the main control chip is connected to the feedback module and the compensation module, for receiving a first feedback signal or a second feedback signal; the main control chip is used to output an adjustment signal to the power unit according to the first feedback signal or the second feedback signal, so as to increase the output voltage of the secondary winding of the transformer through the power unit.
[0010] In some embodiments, the feedback module includes a feedback unit and an isolation unit. A first terminal of the feedback unit is used to receive a first output voltage from the first isolated power supply module. A second terminal of the feedback unit is grounded. A third terminal of the feedback unit is connected to the first terminal of the isolation unit. The second terminal of the isolation unit is connected to the feedback pin of the main control chip. The feedback unit is used to control the input current of the isolation unit according to the first output voltage, so that the isolation unit outputs a first feedback signal to the feedback pin of the main control chip according to the input current.
[0011] In some embodiments, the feedback unit includes a voltage regulator U3, resistors R11, R13, R15, R17, R21, and a capacitor C6. The first terminal of resistor R11 receives the first output voltage. The second terminal of resistor R11 is connected to the first input terminal of the isolation unit. The first input terminal of the isolation unit is connected to the second input terminal of the isolation unit via resistor R15. The second input terminal of the isolation unit is connected to the first terminal of the voltage regulator U3. The second terminal of the voltage regulator U3 is grounded. The third terminal of the voltage regulator U3 is grounded via resistor R21. The third terminal of the voltage regulator U3 receives the first output voltage via resistor R13. Resistor R13 is grounded via resistor R21. The first terminal of capacitor C6 is connected to the first terminal of the voltage regulator U3. The second terminal of capacitor C6 is connected to the third terminal of the voltage regulator U3 via resistor R17.
[0012] In some embodiments, the isolation unit includes an optocoupler U2, the first input terminal of the optocoupler U2 is connected to the second input terminal of the optocoupler U2 through the resistor R15, the first output terminal of the optocoupler U2 is connected to the feedback pin of the main control chip, and the second output terminal of the optocoupler U2 is connected to the reference ground.
[0013] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide an energy storage power supply, including the power supply circuit as described above.
[0014] Unlike related technologies, the power supply circuit and energy storage power supply provided in this application embodiment include a transformer, a first isolated power supply module connected to the transformer, at least one second isolated power supply module connected to the transformer, a feedback module, a main control module, and at least one compensation module. The feedback module is connected to the first isolated power supply module, the at least one compensation module is connected to the at least one second isolated power supply module in a one-to-one correspondence, and the main control module is connected to the at least one compensation module. The feedback module receives a first output voltage from the first isolated power supply module and outputs a first feedback signal to the main control module when the first output voltage is less than a first preset value. The compensation module obtains a second output voltage from the corresponding second isolated power supply module and outputs a second feedback signal to the main control module when the second output voltage is less than a second preset value. The main control module adjusts the secondary winding output voltage of the transformer in response to the first and second feedback signals. The power supply circuit provided in this embodiment receives the first output voltage of the first isolated power supply module through a feedback module. If the first output voltage is less than a preset value, a first feedback signal is provided to the main control module, so that the main control module adjusts the output voltage of the secondary winding of the transformer according to the first feedback signal, thereby increasing the first output voltage of the first isolated power supply module and keeping the first output voltage of the first isolated power supply relatively stable. When the output voltage of the first isolated power supply module is stable and the first feedback signal is not triggered to adjust the output voltage of the secondary winding of the transformer, if the second output voltage of the second isolated power supply module is lower than the second preset value due to reasons such as increased load, the corresponding second output voltage can be obtained through the compensation module, and then a second feedback signal is provided to the main control module accordingly. This allows the main control module to control the increase of the output voltage of the secondary winding of the transformer according to the second feedback signal, thereby controlling the increase of the second output voltage and keeping the output voltage of the second isolated power supply relatively stable. When the output voltage of the second isolated power supply is normal, the second feedback signal is stopped from being provided to the main control module to avoid excessive adjustment of the output voltage of the secondary winding of the transformer. Based on this, the power supply circuit provided in this application embodiment can achieve the effect of maintaining a relatively stable output voltage for each isolated power supply module, so that each isolated power supply module can maintain a high load-carrying capacity. Attached Figure Description
[0015] Figure 1 This is a schematic block diagram of a power supply circuit provided in an embodiment of this application;
[0016] Figure 2 This is a schematic diagram of the circuit structure of a compensation module provided in an embodiment of this application;
[0017] Figure 3This is a schematic block diagram of a power supply circuit provided in an embodiment of this application;
[0018] Figure 4 This is a schematic diagram of the circuit structure of a power supply circuit provided in an embodiment of this application. Detailed Implementation
[0019] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements. The terms "first," "second," etc., used in this specification are for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.
[0021] This application provides a power supply circuit that supplies power to different loads through isolated power supplies at different secondary windings. Please refer to... Figure 1 The power supply circuit 100 includes a transformer 15, a first isolated power supply module 11 connected to the transformer 15, at least one second isolated power supply module 12 connected to the transformer 15, a feedback module 13, a main control module 16, and at least one compensation module 14. The feedback module 13 is connected to the first isolated power supply module 11. It is understood that... Figure 1 In the diagram, 12a-12n represent different second isolated power supply modules 12, and 14a-14n represent different compensation modules 14. At least one compensation module 14a-14n is connected to at least one second isolated power supply module 12a-12n in a one-to-one correspondence, and the main control module 16 is connected to at least one compensation module 14a-14n.
[0022] The feedback module 13 receives the first output voltage of the first isolated power supply module 11 and outputs a first feedback signal to the main control module 16 when the first output voltage is less than a first preset value; the compensation module 14 obtains the second output voltage of the corresponding connected second isolated power supply module 12 and outputs a second feedback signal to the main control module 16 when the second output voltage is less than a second preset value; the main control module 16 adjusts the output voltage of the secondary winding of the transformer 15 in response to the first feedback signal and the second feedback signal.
[0023] In the actual process of powering a load, different isolated power supply modules can supply power to different loads, and the load power will affect the output voltage of the corresponding isolated power supply module.
[0024] To address this, the feedback module 13 in this solution maintains the stability of the output voltage of the first isolated power supply module 11. The feedback module 13 can detect the first output voltage of the first isolated power supply module 11. When the first output voltage of the first isolated power supply module 11 decreases due to an increase in its load, if the first output voltage drops below a first preset value, the compensation module 13 outputs a first feedback signal to the main control module 16. The main control module 16 adjusts the output voltage of the secondary winding of the transformer 15 according to the first feedback signal, increasing the transmission power of the transformer 15, thereby increasing the first output voltage of the first isolated power supply module 11 and maintaining the relative stability of the first output voltage.
[0025] For the remaining second isolated power supply modules 12 that are not connected to the feedback module 13, this solution sets up a compensation module 14 to obtain the second output voltage of the corresponding second isolated power supply module 12. When the output voltage of the first isolated power supply module is stable and the first feedback signal is not triggered to adjust the output voltage of the secondary winding of the transformer, if the load power of a certain second isolated power supply module 12 increases, causing its second output voltage to decrease, and if the second output voltage drops below a second preset threshold, the compensation module 14 connected to that second isolated power supply module 12 will output a second feedback signal to the main control module 16. The main control module 16 adjusts the output voltage of the secondary winding of the transformer 15 according to the second feedback signal, thereby increasing the second output voltage of the second isolated power supply module 12 and maintaining the relative stability of the second output voltage. Based on this, the power supply circuit provided by this solution can maintain a better load-carrying capacity for each isolated power supply module when the load power demand of any load increases.
[0026] Please combine Figure 2 In some embodiments, the compensation module 14 includes an operational amplifier unit 141 and an anti-reverse output unit 142. The operational amplifier unit 141 is used to obtain the second output voltage of the corresponding connected second isolated power supply module 12. When the second output voltage is less than a second preset value, the operational amplifier unit 141, in conjunction with the anti-reverse output unit 142, transmits a second feedback signal to the main control module 16 so that the main control module responds to the second feedback signal and increases the output voltage of the secondary winding of the transformer 15.
[0027] by Figure 2 For example, Figure 2 The figure illustrates a structural schematic of a compensation module 14. As shown, the input terminal of the operational amplifier unit 141 obtains the second output voltage of the correspondingly connected second isolation power supply module 12. Figure 2The diagram shows +12VL. The output of the operational amplifier unit 141 is connected to the feedback pin FB of the main control module 16 through the anti-reverse output unit 142. When the second output voltage is less than the second preset value, the operational amplifier unit 141 outputs a second feedback signal to the feedback pin FB, so that the control module 16 adjusts the secondary winding output voltage of the transformer 15 according to the second feedback signal, thereby increasing the second output voltage of the second isolated power supply module 12. Furthermore, when the second output voltage of the second isolated power supply module increases to a value greater than the second preset value, the operational amplifier unit 141, in conjunction with the anti-reverse output unit 142, stops providing the second feedback signal to the feedback pin, so that the control module 16 stops adjusting the secondary winding output voltage of the transformer 15, preventing over-regulation of the secondary winding output voltage of the transformer 15.
[0028] In some embodiments, please combine Figure 2 The operational amplifier unit 141 includes an operational amplifier U4, resistors R23 and R25, capacitor C10, resistors R22 and R26, resistors R27 and C11. Resistors R23 and R25 are connected in series, and resistors R22 and R26 are connected in series. The reverse output protection unit 142 includes a diode D5 and a resistor R24.
[0029] In this circuit, the first input terminal U4_3 of operational amplifier U4 is connected to the reference power supply (VCC) via resistor R23. The first input terminal U4_3 of operational amplifier U4 is also connected to the reference ground (GND_BAT) via resistor R25. The first terminal of capacitor C10 is connected to the first input terminal U4_3 of operational amplifier U4, and the second terminal of capacitor C10 is connected to the reference ground. The second input terminal U4_2 of operational amplifier U4 is connected to the corresponding second isolation power supply module 12 via resistor R22 to obtain the second output voltage of the second isolation power supply module 12, i.e., +12VL as shown in the figure. The second input terminal U4_2 of operational amplifier U4 is also connected to the reference ground via resistor R26, and the second input terminal U4_2 of operational amplifier U4 is connected to the output terminal U4_1 of operational amplifier U4 via resistor R27. Capacitor C11 is connected in parallel across resistor R27. The output terminal U4_1 of the operational amplifier U4 is connected to the main control module 16 through the anti-reverse output unit 142. Specifically, the anode of the diode D5 is connected to the output terminal U4_1 of the operational amplifier U4, and the cathode of the diode D5 is connected to the feedback pin FB of the main control module 16 through the resistor R24.
[0030] Specifically, the reference power supply VCC, combined with resistors R23 and R25, provides a comparison voltage for operational amplifier U4. When the load power of the first isolation power supply module 11 is small, the control module 16 adjusts the output voltage of the secondary winding of transformer 15, resulting in relatively low transmission power of transformer 15. If the load power of the second isolation power supply module 12 increases at this time, causing the second output voltage +12VL to be less than the second preset value, the voltage supplied to operational amplifier U4 through resistor R22 will decrease. The difference between this voltage and the comparison voltage from the reference power supply VCC will increase. After amplification by operational amplifier U4, the output terminal U4_1 of operational amplifier U4 provides a second feedback signal to the feedback pin FB of control module 16 through diode D5 and resistor R24, thereby increasing the pin voltage of feedback pin FB and prompting control module 16 to adjust the output voltage of the secondary winding of transformer 15, increasing the transmission power of transformer 15 and improving the load capacity of second isolation power supply module 12.
[0031] When the second output voltage +12VL of the second isolation power supply module 12 increases to a value greater than the second preset value, it provides a voltage boost to the operational amplifier U4 through resistor R22. The voltage at the output terminal U4_1 of the operational amplifier U4 decreases. Due to the reverse cutoff characteristic of diode D5, this voltage will not affect the pin voltage of the feedback pin FB. The control module 16 stops adjusting the output voltage of the secondary winding of the transformer 15 to avoid over-adjustment.
[0032] In some embodiments, the operational amplifier unit 141 further includes a filter capacitor C9. The first terminal of the filter capacitor C9 is connected to the power supply terminal of the operational amplifier U4 (represented by VCC in the figure), and the second terminal of the filter capacitor C9 is grounded. The filter capacitor C9 is used to filter out high-frequency noise and ripple, thereby improving the operating stability of the operational amplifier U4.
[0033] Please combine Figure 3 In some embodiments, the main control module 16 includes a control unit 161 and a power unit 162, wherein the control unit 161 includes a main control chip.
[0034] Specifically, the first end of power unit 162 is connected to the secondary winding of transformer 15, the second end of power unit 15 is connected to the detection pin of the main control chip, the control pin of the main control chip is connected to the control terminal of power unit 162, and the feedback pin FB of the main control chip is connected to feedback module 13 and compensation module 14, and can receive a first feedback signal or a second feedback signal. The main control chip outputs an adjustment signal to the power unit according to the first or second feedback signal, so as to increase the output voltage of the secondary winding of the transformer through the power unit. Based on this, the main control chip can dynamically adjust power unit 162 through the control pin, for example, by increasing the output PWM duty cycle, thereby increasing the output voltage of the secondary winding of transformer 15, and thus improving the load-carrying capacity of the first or second isolated power supply module.
[0035] In some embodiments, such as Figure 3 As shown, the feedback module 13 includes a feedback unit 131 and an isolation unit 132. The first terminal of the feedback unit 131 is connected to the first isolated power supply module 11 to receive the first output voltage of the first isolated power supply module 11. The second terminal of the feedback unit 131 is grounded. The third terminal of the feedback unit 131 is connected to the first terminal of the isolation unit 132. The second terminal of the isolation unit 132 is connected to the feedback pin FB of the main control chip. The feedback unit 131 controls the input current of the isolation unit 132 according to the first output voltage, causing the isolation unit 132 to output a first feedback signal to the feedback pin FB of the main control chip based on the input current.
[0036] For specific details, please refer to... Figure 4 The feedback unit 131 includes a voltage regulator U3, resistors R11, R13, R15, R17, R21, and capacitor C6; the isolation unit 132 includes an optocoupler U2.
[0037] like Figure 4As shown, the first terminal of resistor R11 receives the first output voltage of the first isolated power supply module 11, which is indicated as +12VH in the figure. The second terminal of resistor R11 is connected to the first input terminal of isolation unit 132, i.e., pin U2_1 of optocoupler U2. Pin U2_1 of isolation unit 132 is connected to pin U2_2 of isolation unit 132 through resistor R15. Pin U2_2 of isolation unit 132 is connected to the first terminal of voltage regulator U3. The second terminal of voltage regulator U3 is grounded, indicated as GND_BAT in the figure. The third terminal of voltage regulator U3 is grounded through resistor R21. The third terminal of voltage regulator U3 receives the first output voltage through resistor R13. Resistor R13 is grounded through resistor R21. The first end of capacitor C6 is connected to the first end of voltage regulator U3, and the second end of capacitor C6 is connected to the third end of voltage regulator U3 through resistor R17. The first output terminal U2_4 of optocoupler U2 is connected to the feedback pin FB of the main control chip, and the second output terminal U2_3 of optocoupler U2 is connected to the reference ground.
[0038] When the first output voltage +12VH of the first isolated power supply module 11 decreases, if it falls below a first preset value, the reference voltage of the voltage regulator U3 decreases, and the voltage of the voltage regulator U3 increases. This reduces the current flowing through the input side of the optocoupler U2, and consequently reduces the current at the output side of the optocoupler U2. Since the feedback pin FB is usually connected to a pull-up resistor, the voltage at the point where the optocoupler U2 is connected to the feedback pin FB increases. That is, a first feedback signal is output to the feedback pin FB. In response to this first feedback signal, the main control chip dynamically adjusts the power unit 162 through the control pin to increase the transformer output voltage, thereby making the first output voltage of the first isolated power supply module 11 relatively stable.
[0039] Regarding the first isolated power supply module 11, the second isolated power supply module 12, and the main control module 16 of the power supply circuit 100 in this embodiment, Figure 4 This diagram illustrates a circuit structure, which can be understood as follows: Figure 4 The circuit structure example given is only a preferred example and is not intended to limit the circuit structure of the above modules. In other embodiments, the first isolation power supply module 11, the second isolation power supply module 12, and the main control module 16 may differ from those described above. Figure 4 The circuit structure is shown in the example.
[0040] The power supply circuit provided in this embodiment receives the first output voltage of the first isolated power supply module through a feedback module. If the first output voltage is less than a preset value, a first feedback signal is provided to the main control module, so that the main control module adjusts the output voltage of the secondary winding of the transformer according to the first feedback signal, thereby increasing the first output voltage of the first isolated power supply module and keeping the first output voltage of the first isolated power supply relatively stable. When the output voltage of the first isolated power supply module is stable and the first feedback signal is not triggered to adjust the output voltage of the secondary winding of the transformer, if the second output voltage of the second isolated power supply module is lower than the second preset value due to reasons such as increased load, the corresponding second output voltage can be obtained through the compensation module, and then a second feedback signal is provided to the main control module accordingly. This allows the main control module to control the increase of the output voltage of the secondary winding of the transformer according to the second feedback signal, thereby controlling the increase of the second output voltage and keeping the output voltage of the second isolated power supply relatively stable. When the output voltage of the second isolated power supply is normal, the second feedback signal is stopped from being provided to the main control module to avoid excessive adjustment of the output voltage of the secondary winding of the transformer. Based on this, the power supply circuit provided in this application embodiment can achieve the effect of maintaining a relatively stable output voltage for each isolated power supply module, so that each isolated power supply module can maintain a high load-carrying capacity.
[0041] This application provides an energy storage power supply, including the power supply circuit described above. The energy storage power supply possesses the corresponding functional modules and beneficial effects of the power supply circuit. Technical details not described in detail in the energy storage power supply embodiments can be found in the power supply circuit provided in the embodiments of this application.
[0042] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A power supply circuit, characterized in that, The system includes a transformer, a first isolation power supply module connected to the transformer, at least one second isolation power supply module connected to the transformer, a feedback module, a main control module, and at least one compensation module. The feedback module is connected to the first isolation power supply module, the at least one compensation module is connected to the at least one second isolation power supply module in a one-to-one correspondence, and the main control module is connected to the at least one compensation module. The feedback module is used to receive the first output voltage of the first isolated power supply module, and output a first feedback signal to the main control module when the first output voltage is less than a first preset value; The compensation module is used to obtain the second output voltage of the corresponding connected second isolation power supply module, and output a second feedback signal to the main control module when the second output voltage is less than a second preset value; The main control module responds to the first feedback signal and the second feedback signal to adjust the output voltage of the secondary winding of the transformer; The compensation module includes an operational amplifier unit and an anti-reverse output unit. The operational amplifier unit is used to acquire the second output voltage of the corresponding connected second isolated power supply module, and when the second output voltage is less than a second preset value, it outputs a second feedback signal to the main control module in conjunction with the anti-reverse output unit, so that the main control module responds to the second feedback signal and increases the secondary winding output voltage of the transformer; and when the second output voltage is greater than the second preset value, it stops outputting the second feedback signal to the main control module in conjunction with the anti-reverse output unit, so as to stop adjusting the secondary winding output voltage of the transformer.
2. The power supply circuit according to claim 1, characterized in that, The operational amplifier unit includes an operational amplifier U4, resistors R23 and R25, capacitor C10, resistors R22, R26, R27, and capacitor C11. Resistors R23 and R25 are connected in series, and resistors R22 and R26 are connected in series. The first input terminal of the operational amplifier U4 is connected to the reference power supply through the resistor R23, and the first input terminal of the operational amplifier U4 is also connected to the reference ground through the resistor R25. The first terminal of the capacitor C10 is connected to the first input terminal of the operational amplifier U4, and the second terminal of the capacitor C10 is connected to the reference ground. The second input terminal of the operational amplifier U4 is connected to the corresponding second isolation power supply module through resistor R22 to obtain the second output voltage of the second isolation power supply module. The second input terminal of the operational amplifier U4 is also connected to the reference ground through resistor R26. The second input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U4 through resistor R27. The capacitor C11 is connected in parallel across resistor R27. The output of the operational amplifier U4 is connected to the main control module through the anti-reverse output unit.
3. The power supply circuit according to claim 2, characterized in that, The anti-reverse output unit includes a diode D5 and a resistor R24. The anode of the diode D5 is connected to the output terminal of the operational amplifier U4, and the cathode of the diode D5 is connected to the main control module through the resistor R24.
4. The power supply circuit according to claim 2, characterized in that, The operational amplifier unit also includes a filter capacitor C9, the first end of which is connected to the power supply terminal of the operational amplifier U4, and the second end of which is connected to reference ground.
5. The power supply circuit according to claim 1, characterized in that, The main control module includes a control unit and a power unit, and the control unit includes a main control chip; The first end of the power unit is connected to the secondary winding of the transformer, the second end of the power unit is connected to the detection pin of the main control chip, the control pin of the main control chip is connected to the control terminal of the power unit, and the feedback pin of the main control chip is connected to the feedback module and the compensation module, for receiving a first feedback signal or a second feedback signal; The main control chip is used to output an adjustment signal to the power unit according to the first feedback signal or the second feedback signal, so as to increase the output voltage of the secondary winding of the transformer through the power unit.
6. The power supply circuit according to claim 5, characterized in that, The feedback module includes a feedback unit and an isolation unit. The first end of the feedback unit is used to receive the first output voltage of the first isolated power supply module. The second end of the feedback unit is grounded. The third end of the feedback unit is connected to the first end of the isolation unit. The second end of the isolation unit is connected to the feedback pin of the main control chip. The feedback unit is used to control the input current of the isolation unit according to the first output voltage, so that the isolation unit outputs a first feedback signal to the feedback pin of the main control chip according to the input current.
7. The power supply circuit according to claim 6, characterized in that, The feedback unit includes a voltage regulator U3, resistors R11, R13, R15, R17, R21, and a resistor and capacitor C6. The first end of resistor R11 is used to receive the first output voltage. The second end of resistor R11 is connected to the first input terminal of the isolation unit. The first input terminal of the isolation unit is connected to the second input terminal of the isolation unit through resistor R15. The second input terminal of the isolation unit is connected to the first terminal of voltage regulator U3. The second terminal of voltage regulator U3 is grounded. The third terminal of voltage regulator U3 is grounded through resistor R21. The third terminal of voltage regulator U3 receives the first output voltage through resistor R13. Resistor R13 is grounded through resistor R21. The first end of capacitor C6 is connected to the first terminal of voltage regulator U3. The second end of capacitor C6 is connected to the third terminal of voltage regulator U3 through resistor R17.
8. The power supply circuit according to claim 7, characterized in that, The isolation unit includes an optocoupler U2. The first input terminal of the optocoupler U2 is connected to the second input terminal of the optocoupler U2 through the resistor R15. The first output terminal of the optocoupler U2 is connected to the feedback pin of the main control chip, and the second output terminal of the optocoupler U2 is connected to the reference ground.
9. An energy storage power source, characterized in that, Includes the power supply circuit as described in any one of claims 1-8.