Power balancing circuit applied to flyback circuit and energy storage power supply

Abstract

The invention relates to a power balancing circuit applied to a flyback circuit and an energy storage power supply. The power balance circuit comprises a first control module and a power balance module which are connected with each other, and the power balance module is connected with the feedback winding. The first control module is used for receiving reference voltage and secondary side voltage of the secondary side winding, controlling the power balance module to stop working under the condition that the secondary side voltage is larger than or equal to the reference voltage, and controlling the power balance module to work under the condition that the secondary side voltage is smaller than the reference voltage. And the power balance module is used for increasing the load power of the feedback winding according to the working current of the power balance module under the working condition. By adopting the power balancing circuit, the power between the feedback winding and the secondary winding in the flyback circuit can be balanced.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly to a power balance circuit applied to a flyback circuit and an energy storage power supply. Background Art

[0002] Energy storage power supplies are increasingly widely used in various scenarios, and the auxiliary power supply of an energy storage power supply is an important part of the energy storage power supply, which supplies power to components such as fans in the energy storage power supply, relays of an inverter circuit, switch tube drivers, current transformers (CTs), display screens, and control chips.

[0003] In related technologies, a flyback circuit is usually used to output different supply voltages to supply power to the above-mentioned components through the supply voltages output by the flyback circuit.

[0004] However, due to the leakage inductance of the transformer in the flyback circuit, there is a cross-regulation rate in the flyback circuit, resulting in an imbalance in power between the feedback winding and the secondary winding during the operation of the flyback circuit, which may cause the energy storage power supply to fail to operate. Summary of the Invention

[0005] Based on this, it is necessary to provide a power balance circuit applied to a flyback circuit and an energy storage power supply for the above technical problems.

[0006] In a first aspect, the present application provides a power balance circuit applied to a flyback circuit, including a feedback winding and a secondary winding. The power balance circuit includes a first control module and a power balance module connected to each other, and the power balance module is connected to the feedback winding;

[0007] The first control module is configured to receive a reference voltage and a secondary voltage of the secondary winding, and control the power balance module to stop working when the secondary voltage is greater than or equal to the reference voltage, and control the power balance module to work when the secondary voltage is less than the reference voltage;

[0008] The power balance module is configured to increase the load power of the feedback winding according to the working current of the power balance module when working.

[0009] In one embodiment, the first control module includes a comparison unit and a locking unit; the locking unit is respectively connected to the comparison unit and the power balance module;

[0010] The comparison unit is configured to receive the reference voltage and the secondary voltage, and control the power balance module to maintain working through the locking unit when the secondary voltage is less than the reference voltage.

[0011] In one embodiment, the first control module further includes an energy storage unit, and the energy storage unit is respectively connected to the locking unit and the power balance module;

[0012] A comparison unit, configured to, when the secondary side voltage is less than the reference voltage, control the energy storage unit to charge according to the difference between the secondary side voltage and the reference voltage through the locking unit, so as to control the operating current of the power balance module according to the voltage of the energy storage unit when the voltage of the energy storage unit is greater than a preset charging threshold.

[0013] In one embodiment, the locking unit includes a first auxiliary power supply, a first follower subunit, a unidirectional conduction subunit, a second follower subunit, and a first energy storage subunit; the first auxiliary power supply is connected to the first follower subunit, the non-inverting input terminal of the first follower subunit is connected to the comparison unit, the inverting input terminal and the output terminal of the first follower subunit are both connected to the positive electrode of the unidirectional conduction subunit, the negative electrode of the unidirectional conduction subunit is connected to the first end of the first energy storage subunit, the first end of the first energy storage subunit is further connected to the non-inverting input terminal of the second follower subunit, the inverting input terminal and the output terminal of the second follower subunit are both connected to the power balance module, and the second end of the first energy storage subunit is grounded;

[0014] A comparison unit, configured to output a first voltage according to the difference between the secondary side voltage and the reference voltage when the secondary side voltage is less than the reference voltage;

[0015] The first follower subunit is configured to control the energy storage unit to charge through the first voltage;

[0016] The unidirectional conduction subunit is configured to maintain the maximum value of the voltage of the first energy storage subunit;

[0017] The second follower subunit is configured to control the operating current of the power balance module according to the voltage of the energy storage subunit.

[0018] In one embodiment, the inverting input terminal and the output terminal of the second follower subunit are both connected to the energy storage unit;

[0019] The second follower subunit is configured to control the energy storage unit to charge according to the voltage of the first energy storage subunit.

[0020] In one embodiment, the energy storage parameters of the first energy storage subunit are determined according to the drive signal for starting the first element and the drive signal for starting the second element, the secondary side winding is used to supply power to the first element, the feedback winding is used to supply power to the second element, and the starting time of the first element is earlier than the starting time of the second element.

[0021] In one embodiment, the comparison unit includes a second auxiliary power supply, a first operational amplifier subunit, and a second energy storage subunit;

[0022] The second auxiliary power supply is connected to the first operational amplifier sub-unit. The non-inverting input terminal of the first operational amplifier sub-unit is used to receive a reference voltage, the inverting input terminal of the first operational amplifier sub-unit is used to receive the secondary side voltage, the output terminal of the first operational amplifier sub-unit is connected to the second energy storage sub-unit, and the second energy storage sub-unit is connected to the locking unit;

[0023] The first operational amplifier sub-unit is used to control the second energy storage sub-unit to charge according to the difference between the secondary side voltage and the reference voltage when the secondary side voltage is less than the reference voltage, so as to control the power balance module to maintain operation through the locking unit according to the voltage of the second energy storage sub-unit.

[0024] In one embodiment, the power balance module includes an optocoupler unit. The optocoupler unit integrates a diode sub-unit and a triode sub-unit. The diode sub-unit is connected to the first control module, and the triode sub-unit is connected to the feedback winding;

[0025] The first control module is used to control the diode sub-unit to be in the cut-off state when the secondary side voltage is greater than or equal to the reference voltage, and to control the diode sub-unit to be in the conducting state when the secondary side voltage is less than the reference voltage;

[0026] The diode sub-unit is used to control the triode sub-unit to conduct according to the first current of the diode sub-unit when it is in the conducting state;

[0027] The triode sub-unit is used to increase the load power of the feedback winding according to the second current of the triode sub-unit when it is in the conducting state.

[0028] In one embodiment, the power balance circuit further includes a second control module;

[0029] The second control module is used to receive the target control signal of the second component and control the power balance module to stop operating when the target control signal is used to indicate the start of the second component.

[0030] In one embodiment, the second control module includes a first switch unit and a second switch unit connected to each other. The second switch unit is connected to the first control module;

[0031] The first switch unit is used to receive the target control signal and be in the conducting state when the target control signal is used to indicate the start of the second component, so as to control the second switch unit to be in the conducting state when it is in the conducting state;

[0032] The second switch unit is used to control the power balance module to stop operating through the first control module when it is in the conducting state.

[0033] In one embodiment, the second switching unit includes a first transistor and a discharging element; the gate and the source of the first transistor are both connected to the first switching unit, and the drain of the first transistor is connected to the first energy storage subunit through the discharging element;

[0034] The first switching unit is configured to control the first transistor to be turned on when in the on state, so as to discharge the energy of the first energy storage subunit through the discharging element, and make the power balancing module stop working.

[0035] In one embodiment, the first switching unit includes a third auxiliary power supply, a second transistor, a third transistor, a second operational amplifier subunit, and a third energy storage subunit;

[0036] The gate of the second transistor is configured to receive a target control signal. The drain of the second transistor is respectively connected to the base of the third transistor and the third auxiliary power supply. The source of the second transistor is connected to the inverting input terminal of the second operational amplifier subunit. The emitter of the third transistor is connected to the third auxiliary power supply. The collector of the third transistor is connected to the non-inverting input terminal of the second operational amplifier subunit. The output terminal of the second operational amplifier subunit is connected to the third energy storage subunit, and the third energy storage subunit is connected to the second switching unit.

[0037] In a second aspect, the present application further provides an energy storage power supply, including a flyback circuit and the power balancing circuit as described in any one of the above.

[0038] For the power balancing circuit and the energy storage power supply applied to the flyback circuit as described above, the power balancing circuit includes a first control module and a power balancing module connected to each other, and the power balancing module is connected to the feedback winding. Since the first control module can receive the reference voltage and the secondary voltage of the secondary winding, and control the power balancing module to stop working when the secondary voltage is greater than or equal to the reference voltage, and control the power balancing module to work when the secondary voltage is less than the reference voltage. When the power balancing module is working, it can increase the load power of the feedback winding according to the working current of the power balancing module. Therefore, when the start of the first component causes the secondary voltage to drop, resulting in the power of the secondary winding being much greater than the power of the feedback winding, that is, when the feedback winding is lightly loaded and the secondary winding is heavily loaded, the load of the feedback winding can be increased through the working current of the power balancing module, so that the power between the feedback winding and the secondary winding is balanced. In this way, it can also avoid the situation that the operation of the energy storage power supply fails due to the start of the first component, making the energy storage power supply operate more stably and improving the reliability of the energy storage power supply. Description of the Drawings

[0039] To more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings required for the description of the embodiments of the present application or the related art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic diagram of a flyback circuit in the related art;

[0041] Figure 2 It is a schematic diagram of a power balance circuit in an embodiment;

[0042] Figure 3 It is a schematic diagram of a first control module in an embodiment;

[0043] Figure 4 It is a schematic diagram of another first control module in an embodiment;

[0044] Figure 5 It is a schematic diagram of another power balance circuit in an embodiment;

[0045] Figure 6 It is a schematic diagram of the current change of the optocoupler unit in an embodiment;

[0046] Figure 7 It is a schematic diagram of another power balance circuit in an embodiment;

[0047] Figure 8 It is a schematic diagram of the startup process of the second component in an embodiment;

[0048] Figure 9 It is a schematic diagram of an energy storage power supply in an embodiment. Detailed implementation manners

[0049] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further details the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] Figure 1 It is a schematic diagram of a flyback circuit in the related art, as Figure 1 shown. The flyback circuit 100 includes the battery voltage BAT+, the feedback winding 101 (i.e., Figure 1 12V_P in Figure 112V_S), capacitor C2, transistor Q1, resistor R3, resistor R4, Control Integrated Circuit (Control IC) 103, capacitor C3, resistor R5, resistor R6, and transistor Q2. Among them, the input (IN) pin of the control integrated circuit 103 is connected to the battery voltage BAT+, the feedback (FB) pin of the control integrated circuit 103 is connected to the collector of the transistor Q2, and the gate drive (GATE) pin of the control integrated circuit 103 is connected to the gate of the transistor Q1 through the resistor R3.

[0051] Among them, the feedback winding 12V_P can supply power to the fan, low-voltage side switch tube drive, display screen, and control chip in the energy storage power supply, and the secondary winding 12V_S can supply power to the relay, high-voltage side switch tube drive, and CT in the inverter circuit. Specifically, the display screen and the control chip can be powered by the feedback winding 12V_P after being converted to 5 volts (V) voltage through a buck module. Exemplarily, the power of the fan is about 3 watts (W); the power of the low-voltage side switch tube drive is about 1W; the power of the display screen and the control chip is about 1W; the power of the relay in the inverter circuit is about 3W; the power of the CT is about 1W; the power of the high-voltage side switch tube drive is about 1W.

[0052] When the energy storage power supply is working, that is, when the energy storage power supply starts to charge or discharge, the energy storage power supply will go through the following three working processes in sequence: Working process 1, the low-voltage side switch tube drive, high-voltage side switch tube drive, CT, display screen, and control chip start to work; Working process 2, the relay in the inverter circuit closes and works; Working process 3: After the charging or discharging power of the energy storage power supply is stable, the fan starts to work.

[0053] In working process 1, the total power of the feedback winding 12V_P is 2W, and the total power of the secondary winding 12V_S is 2W. At this time, the power of the feedback winding 12V_P is relatively balanced with the power of the secondary winding 12V_S. That is, the energy coupling between the feedback winding and the secondary winding is balanced, and the secondary voltage of the secondary winding 12V_S does not change, which does not affect the normal operation of the energy storage power supply.

[0054] In working process 2, the total power of the feedback winding 12V_P is 2W, and the total power of the secondary winding 12V_S is 5W. At this time, the power of the secondary winding 12V_S is much larger than the power of the feedback winding 12V_P, so the secondary voltage of the secondary winding 12V_S will drop, and may even drop below the minimum pull-in voltage of the relay, resulting in the failure of the relay in the inverter circuit to pull in, causing the charging or discharging of the energy storage power supply to fail.

[0055] It can be seen that due to the cross regulation rate of the flyback circuit, if the energy coupling between the feedback winding and the secondary winding is unbalanced, resulting in a decrease in the secondary voltage and the failure of the energy storage power supply to operate, the reliability of the energy storage power supply is affected. Based on this, the present application provides a power balance circuit for a flyback circuit, which will be introduced in detail below.

[0056] Figure 2 FIG. is a schematic diagram of a power balance circuit in an embodiment, as Figure 2 shown. In an exemplary embodiment, the flyback circuit 100 includes a feedback winding 101 and a secondary winding 102. The power balance circuit 200 of the flyback circuit 100 includes a first control module 201 and a power balance module 202 connected to each other, wherein the power balance module 202 is connected to the feedback winding 101.

[0057] Further, the first control module 201 is configured to receive a reference voltage and the secondary voltage of the secondary winding 102. Among them, the secondary voltage can be obtained by means of a voltage sensor. The reference voltage can be understood as the reference value corresponding to the secondary voltage, which can be set according to actual needs. Exemplarily, if the secondary voltage is 12 volts (V) under ideal conditions, the reference voltage can be 11.5V. If the secondary voltage is less than the reference voltage, it means that in order to maintain the power balance between the feedback winding 101 and the secondary winding 102, the secondary voltage drops.

[0058] Furthermore, when the secondary voltage is greater than or equal to the reference voltage, the first control module 201 can control the power balance module 202 to stop working. When the secondary voltage is less than the reference voltage, the first control module 201 can control the power balance module 202 to work.

[0059] Optionally, the first control module 201 may include at least one switching element. If the secondary voltage is greater than or equal to the reference voltage, the first control module 201 disconnects the switching element in the first control module 201 to disconnect the path between the first control module 201 and the power balance module 202, so that the power balance module 202 stops working. If the secondary voltage is less than the reference voltage, the first control module 201 turns on the switching element in the first control module 201 to turn on the path between the first control module 201 and the power balance module 202, so that the power balance module 202 works.

[0060] Furthermore, when the power balance module 202 is operating, it generates an operating current. Since the power balance module 202 is connected to the feedback winding 101, the operating current passing through the power balance module 202 can increase the load power of the feedback winding 101. Among them, the operating current of the power balance module 202 is positively correlated with the load power of the feedback winding 101. That is to say, the greater the operating current of the power balance module 202, the greater the increased load power of the feedback winding 101.

[0061] Exemplarily, the power balance module 202 includes a variable resistor. After the power balance module 202 operates, the operating current of the power balance module 202 can be controlled by controlling the resistance value of the variable resistor to increase the load power of the feedback winding 101. The power balance module 202 may also include a signal driving element and a transistor. After the power balance module 202 operates, the duty cycle of the signal output by the signal driving element can be controlled to control the conduction current of the transistor through the duty cycle of the signal output by the signal driving element, thereby controlling the operating current of the power balance module 202 to increase the load power of the feedback winding 101. The above only exemplifies some optional ways to increase the load power of the feedback winding 101, and this embodiment is not limited thereto.

[0062] The above-mentioned power balance circuit 200 includes a first control module 201 and a power balance module 202 that are connected to each other, and the power balance module 202 is connected to the feedback winding 101. Since the first control module 201 can receive the reference voltage and the secondary voltage of the secondary winding 102, and when the secondary voltage is greater than or equal to the reference voltage, control the power balance module 202 to stop operating, and when the secondary voltage is less than the reference voltage, control the power balance module 202 to operate. And when the power balance module 202 is operating, it can increase the load power of the feedback winding 101 according to the operating current of the power balance module 202. Therefore, when the start of the first component causes the secondary voltage to drop, resulting in the power of the secondary winding 102 being much greater than the power of the feedback winding 101, that is, when the feedback winding 101 is lightly loaded and the secondary winding 102 is heavily loaded, the load of the feedback winding 101 can be increased through the operating current of the power balance module 202, so that the power between the feedback winding 101 and the secondary winding 102 is balanced. In this way, it can also avoid the situation where the energy storage power supply fails to operate due to the start of the first component, making the energy storage power supply operate more stably and improving the reliability of the energy storage power supply.

[0063] Figure 3 Schematic diagram of a first control module in an embodiment, as Figure 3As shown, in an exemplary embodiment, optionally, the first control module 201 includes a comparison unit 2021 and a locking unit 2022. Among them, the locking unit 2022 is respectively connected to the comparison unit 2021 and the power balance module 202.

[0064] Furthermore, the comparison unit 2021 is configured to receive a reference voltage and a secondary side voltage, and when the secondary side voltage is less than the reference voltage, control the power balance module 202 to maintain operation through the locking unit 2022. That is to say, when the secondary side voltage is less than the reference voltage, the power balance module 202 will operate. During this process, even if the secondary side voltage resumes to be greater than or equal to the reference voltage, under the control of the locking unit 2022, the power balance module 202 will still maintain operation.

[0065] Optionally, the comparison unit 2021 may include, but is not limited to, an operational amplifier. The non-inverting input terminal of the operational amplifier is used to receive the reference voltage, the inverting input terminal of the operational amplifier is used to receive the secondary side voltage, and the output terminal of the operational amplifier is connected to the locking unit 2022. Exemplarily, if the secondary side voltage is greater than or equal to the reference voltage, the operational amplifier outputs a low level, and both the locking unit 2022 and the power balance module 202 do not operate. If the secondary side voltage is less than the reference voltage, the operational amplifier outputs a high level, the power balance module 202 operates, and through the locking unit 2022, the power balance module 202 can be maintained to operate.

[0066] Further optionally, when the secondary side voltage is greater than or equal to the reference voltage, the comparison unit 2021 controls the locking unit 2022 to be in a cut-off state, and the locking unit 2022 does not operate. When the secondary side voltage is less than the reference voltage, the comparison unit 2021 controls the locking unit 2022 to be in a conducting state, and the locking unit 2022 operates. Exemplarily, the locking unit 2022 can be implemented by an RS flip-flop, a relay, or a self-locking circuit composed of two triodes, and this embodiment does not make any limitations.

[0067] In the above embodiment, the first control module 201 includes a comparison unit 2021 and a locking unit 2022, and the locking unit 2022 is respectively connected to the comparison unit 2021 and the power balance module 202. Since the comparison unit 2021 can receive the reference voltage and the secondary side voltage, and when the secondary side voltage is less than the reference voltage, control the power balance module 202 to maintain operation through the locking unit 2022, therefore, during the process of the power balance module 202 maintaining operation, the situation of repeated changes in the secondary side voltage can be avoided, improving the stability of the energy storage power supply.

[0068] Figure 4 Schematic diagram of another first control module in an embodiment, as Figure 4As shown, in an exemplary embodiment, optionally, the first control module 201 further includes an energy storage unit 2023, and the energy storage unit 2023 is respectively connected to the locking unit 2022 and the power balance module 202. Among them, the energy storage unit 2023 includes at least one energy storage element, and the energy storage element includes but is not limited to a battery or a capacitor.

[0069] Further, the comparison unit 2021 is configured to, when the secondary side voltage is less than the reference voltage, control the energy storage unit 2023 to charge according to the difference between the secondary side voltage and the reference voltage through the locking unit 2022, so as to control the working current of the power balance module 202 according to the voltage of the energy storage unit 2023 when the voltage of the energy storage unit 2023 is greater than the preset charging threshold. Among them, the preset charging threshold can be set according to actual needs, and this embodiment does not limit it. In one embodiment, the preset charging threshold can be the conduction voltage drop of the diode integrated inside the optocoupler unit.

[0070] Optionally, the difference between the secondary side voltage and the reference voltage is positively correlated with the voltage of the energy storage unit 2023. For example, the greater the difference between the secondary side voltage and the reference voltage, the greater the output voltage of the comparison unit 2021, the greater the charging current for charging the energy storage unit 2023, and the higher the voltage of the energy storage unit 2023.

[0071] Further optionally, the voltage of the energy storage unit 2023 is positively correlated with the working current of the power balance module 202. That is to say, the greater the voltage of the energy storage unit 2023, the greater the working current of the power balance module 202, and the greater the increased load power.

[0072] In the above embodiment, the first control module 201 further includes an energy storage unit 2023, and the energy storage unit 2023 is respectively connected to the locking unit 2022 and the power balance module 202. Since the comparison unit 2021 can, when the secondary side voltage is less than the reference voltage, control the energy storage unit 2023 to charge according to the difference between the secondary side voltage and the reference voltage through the locking unit 2022, so as to control the working current of the power balance module 202 according to the voltage of the energy storage unit 2023 when the voltage of the energy storage unit 2023 is greater than the preset charging threshold, therefore, the smaller the secondary side voltage, the greater the difference between the secondary side voltage and the reference voltage, the greater the load power added to the feedback winding 101, so that the power between the feedback winding 101 and the secondary side winding 102 tends to be balanced.

[0073] In an exemplary embodiment, optionally, the locking unit 2022 includes a first auxiliary power supply, a first follower subunit, a unidirectional conduction subunit, a second follower subunit, and a first energy storage subunit. The first auxiliary power supply can be any form of current source or voltage source. The first follower subunit and the second follower subunit can both include, but are not limited to, operational amplifiers. The unidirectional conduction subunit includes at least one diode. The first energy storage subunit includes, but is not limited to, a capacitor or a battery. Figure 5 Schematic diagram of another power balance circuit 200 in an embodiment, as Figure 5 shown. The following takes the first follower subunit including operational amplifier U3A, the unidirectional conduction subunit including diode D3, the second follower subunit including operational amplifier U3B, and the first energy storage subunit including capacitor C6 as an example.

[0074] As Figure 5 shown, the first auxiliary power supply VCC1 is connected to the first follower subunit. The non-inverting input terminal of the first follower subunit is connected to the comparison unit 2021. The inverting input terminal and the output terminal of the first follower subunit are both connected to the positive electrode of the unidirectional conduction subunit. The negative electrode of the unidirectional conduction subunit is connected to the first end of the first energy storage subunit. The first end of the first energy storage subunit is also connected to the non-inverting input terminal of the second follower subunit. The inverting input terminal and the output terminal of the second follower subunit are both connected to the power balance module 202. The second end of the first energy storage subunit is grounded.

[0075] Further, the comparison unit 2021 is configured to output a first voltage according to the difference between the secondary side voltage and the reference voltage when the secondary side voltage is less than the reference voltage. The first follower subunit is configured to control the energy storage unit 2023 to charge through the first voltage. The unidirectional conduction subunit is configured to maintain the maximum value of the voltage of the first energy storage subunit. The second follower subunit is configured to control the working current of the power balance module 202 according to the voltage of the energy storage subunit.

[0076] Please refer to Figure 5, the output terminal of operational amplifier U3A follows the non-inverting input terminal of operational amplifier U3A. When the secondary side voltage is less than the reference voltage, the voltage at the output terminal of operational amplifier U3A charges capacitor C6 through diode D3. Furthermore, the output terminal of operational amplifier U3B follows the non-inverting input terminal of operational amplifier U3B, that is, follows the voltage value of capacitor C6. When the input value at the non-inverting input terminal of operational amplifier U3A decreases, that is, when the first voltage output by comparison unit 2021 decreases, the voltage at the output terminal of operational amplifier U3A also decreases. However, due to the unidirectional conductivity of diode D3, the voltage of capacitor C6 does not decrease accordingly but remains at its maximum voltage value, causing the output terminal of operational amplifier U3B to follow the non-inverting input terminal of operational amplifier U3B, that is, follow the voltage value of capacitor C6, so as to control the working current of power balance module 202 according to the voltage value of capacitor C6.

[0077] In the above embodiment, locking unit 2022 includes a first auxiliary power supply, a first follower sub-unit, a unidirectional conduction sub-unit, a second follower sub-unit, and a first energy storage sub-unit. The first auxiliary power supply is connected to the first follower sub-unit. The non-inverting input terminal of the first follower sub-unit is connected to comparison unit 2021. The inverting input terminal and the output terminal of the first follower sub-unit are both connected to the positive pole of the unidirectional conduction sub-unit. The negative pole of the unidirectional conduction sub-unit is connected to the first end of the first energy storage sub-unit. The first end of the first energy storage sub-unit is also connected to the non-inverting input terminal of the second follower sub-unit. The inverting input terminal and the output terminal of the second follower sub-unit are both connected to power balance module 202. The second end of the first energy storage sub-unit is grounded. Since comparison unit 2021 can output a first voltage according to the difference between the secondary side voltage and the reference voltage when the secondary side voltage is less than the reference voltage, the first follower sub-unit can control energy storage unit 2023 to charge through the first voltage. Further, under the action of the unidirectional conduction sub-unit, the voltage of the first energy storage sub-unit can be maintained at the maximum value, so that the second follower sub-unit controls the working current of power balance module 202 according to the voltage of the energy storage sub-unit. In this way, when the secondary side voltage is less than the reference voltage, power balance module 202 can be controlled to maintain operation through locking unit 2022.

[0078] In an exemplary embodiment, optionally, the inverting input terminal and the output terminal of the second follower sub-unit are both connected to energy storage unit 2023. The second follower sub-unit is used to control energy storage unit 2023 to charge according to the voltage of the first energy storage sub-unit. It can be understood that the voltage of the first energy storage sub-unit is positively correlated with the voltage of the energy storage sub-unit. That is, the greater the voltage of the first energy storage sub-unit, the greater the voltage of the energy storage sub-unit.

[0079] Please continue to refer to Figure 5, taking the energy storage unit 2023 including the capacitor C7 as an example, the output terminal of the operational amplifier U3B will follow the voltage of the capacitor C6 to charge the capacitor C7 through the voltage of the capacitor C6.

[0080] In the above embodiment, since both the inverting input terminal and the output terminal of the second follower sub-unit are connected to the energy storage unit 2023, the second follower sub-unit can efficiently control the energy storage unit 2023 to charge according to the voltage of the first energy storage sub-unit.

[0081] In an exemplary embodiment, optionally, the energy storage parameter of the first energy storage sub-unit is determined according to the drive signal for starting the first component and the drive signal for starting the second component. The secondary winding 102 is used to supply power to the first component, and the feedback winding 101 is used to supply power to the second component.

[0082] In this embodiment, the secondary voltage corresponding to the secondary winding 102 supplies power to the first component. Therefore, the start of the first component will cause the secondary voltage to drop. The feedback voltage corresponding to the feedback winding 101 supplies power to the second component. Therefore, the start of the second component will cause the feedback voltage to drop. And, the start time of the first component is earlier than the start time of the second component. The first component includes but is not limited to the relay in the above inverter circuit. The second component includes but is not limited to the above-mentioned fan.

[0083] The drive signal of the first component is used to control the start or stop of the first component. Optionally, the drive signal of the first component includes a first level or a second level. When the drive signal of the first component is the first level, it is a drive signal for controlling the first component to stop working. When the drive signal of the first component is the second level, it is a drive signal for controlling the first component to start. The first level and the second level can be set according to requirements. Exemplarily, the first level can be a low level, and the second level can be a high level.

[0084] Similarly, the drive signal of the second component is used to control the start or stop of the second component. Optionally, the drive signal of the second component includes a third level or a fourth level. When the drive signal of the second component is the third level, it is a drive signal for controlling the second component to stop working. When the drive signal of the second component is the fourth level, it is a drive signal for controlling the second component to start. The third level and the fourth level can be set according to requirements. Exemplarily, the third level can be a low level, and the fourth level can be a high level.

[0085] Optionally, the time for the first energy storage sub-unit to maintain the maximum value of its voltage is at least greater than or equal to a first preset duration. The first preset duration is the duration corresponding to the time of the drive signal for starting the first component to the time of the drive signal for starting the second component.

[0086] In the above embodiments, since the energy storage parameters of the first energy storage sub-unit are determined according to the drive signal for starting the first component and the drive signal for starting the second component, the secondary winding 102 is used to supply power to the first component, the feedback winding is used to supply power to the second component, and the start time of the first component is earlier than the start time of the second component. Therefore, before the second component is started, the locking unit 2022 will maintain the operation of the power balance module 202, further improving the working reliability of the energy storage power supply.

[0087] Please continue to refer to Figure 5 , in an exemplary embodiment, optionally, the comparison unit 2021 includes a second auxiliary power supply, a first operational amplifier sub-unit, and a second energy storage sub-unit. The second auxiliary power supply can be any form of current source or voltage source, and the second auxiliary power supply and the first auxiliary power supply can be the same or different. The first operational amplifier sub-unit can include at least one operational amplifier, and the second energy storage sub-unit includes but is not limited to a capacitor or a battery.

[0088] As Figure 5 shown, taking the first operational amplifier sub-unit including U1A and the second energy storage sub-unit including capacitor C4 as an example, the second auxiliary power supply VCC2 is connected to the first operational amplifier sub-unit. The non-inverting input terminal of the first operational amplifier sub-unit is used to receive the reference voltage, the inverting input terminal of the first operational amplifier sub-unit is used to receive the secondary voltage, the output terminal of the first operational amplifier sub-unit is connected to the second energy storage sub-unit, and the second energy storage sub-unit is connected to the locking unit 2022.

[0089] Further, when the secondary voltage is less than the reference voltage, the first operational amplifier sub-unit can control the second energy storage sub-unit to charge according to the difference between the secondary voltage and the reference voltage. Furthermore, according to the voltage of the second energy storage sub-unit, the locking unit 2022 can be used to control the power balance module 202 to maintain operation.

[0090] Please continue to refer to Figure 5 , if the secondary voltage is less than the reference voltage, the output terminal of the operational amplifier U1A starts to output and charges the capacitor C4. The non-inverting input terminal of the operational amplifier U3A follows the voltage of the capacitor C4, and the output terminal of the operational amplifier U3A follows the non-inverting input terminal of the operational amplifier U3A. In this way, the voltage at the output terminal of the operational amplifier U3A will charge the capacitor C6 through the diode D3. The non-inverting input terminal and the output terminal of the operational amplifier U3B follow the voltage of the capacitor C6. Therefore, the voltage at the output terminal of the operational amplifier U3B charges the capacitor C7. Furthermore, according to the voltage of the capacitor C7, the working current of the power balance module 202 can be controlled to increase the load power of the feedback winding 101.

[0091] In the above embodiments, since the comparison unit 2021 includes a second auxiliary power supply, a first operational amplifier sub-unit, and a second energy storage sub-unit, the second auxiliary power supply is connected to the first operational amplifier sub-unit. The non-inverting input terminal of the first operational amplifier sub-unit is used to receive a reference voltage, the inverting input terminal of the first operational amplifier sub-unit is used to receive the secondary side voltage, the output terminal of the first operational amplifier sub-unit is connected to the second energy storage sub-unit, and the second energy storage sub-unit is connected to the locking unit 2022. Therefore, when the secondary side voltage is less than the reference voltage, the first operational amplifier sub-unit can control the second energy storage sub-unit to charge according to the difference between the secondary side voltage and the reference voltage, and control the power balance module 202 to maintain operation through the locking unit 2022 according to the voltage of the second energy storage sub-unit.

[0092] Please continue to refer to Figure 5 , in an exemplary embodiment, optionally, the power balance module 202 includes an optocoupler unit U1. The optocoupler unit U1 integrates a diode sub-unit (as shown between pin 1 and pin 2 of U1 in Figure 5 ) and a triode sub-unit (as shown between pin 3 and pin 4 of U1 in Figure 5 ). The diode sub-unit is connected to the first control module 201, and the triode sub-unit is connected to the feedback winding 101.

[0093] When the secondary side voltage is greater than or equal to the reference voltage, the first control module 201 controls the diode sub-unit to be in the cut-off state. When the secondary side voltage is less than the reference voltage, the first control module 201 controls the diode sub-unit to be in the conducting state. Further, when the diode sub-unit is in the conducting state, it controls the triode sub-unit to conduct according to the first current of the diode sub-unit. After the triode sub-unit is in the conducting state, it can increase the load power of the feedback winding 101 according to the second current of the triode sub-unit.

[0094] Wherein, the first current is the current flowing through the diode sub-unit, and the second current is the collector current flowing through the triode sub-unit. Figure 6 FIG. is a schematic diagram of the current change of the optocoupler unit in an embodiment. As shown in Figure 6 , within a certain range, the second current Ic of the triode sub-unit in the optocoupler unit U1 increases with the increase of the first current IF of the diode sub-unit.

[0095] Please continue to refer to Figure 5, if the secondary side voltage is greater than or equal to the reference voltage, the optocoupler unit U1 does not work and there is no current loop on the resistor R7. If the secondary side voltage is less than the reference voltage, the diode sub-unit in the optocoupler unit U1 is in the conducting state, forming a first current IF flowing through the diode sub-unit. In this case, the triode sub-unit starts to conduct, forming a second current Ic flowing through the internal triode sub-unit, and a current loop is generated on the resistor R7, thereby increasing the load power of the feedback winding 12V_P.

[0096] In one embodiment, the increased load power is determined according to the second current of the triode sub-unit and the resistance value of the resistor R7. Exemplarily, the increased load power can be equal to .

[0097] In the above embodiment, the power balance module 202 includes an optocoupler unit U1. The optocoupler unit U1 integrates a diode sub-unit and a triode sub-unit. The diode sub-unit is connected to the first control module 201, and the triode sub-unit is connected to the feedback winding 101. Since the first control module 201 is used to control the diode sub-unit to be in the cut-off state when the secondary side voltage is greater than or equal to the reference voltage, and to control the diode sub-unit to be in the conducting state when the secondary side voltage is less than the reference voltage, therefore, the diode sub-unit can control the triode sub-unit to conduct according to the first current of the diode sub-unit when it is in the conducting state. In this way, the triode sub-unit can increase the load power of the feedback winding 101 according to the second current of the triode sub-unit when it is in the conducting state.

[0098] Figure 7 Schematic diagram of another power balance circuit in one embodiment, as Figure 7 shown. In an exemplary embodiment, optionally, the power balance circuit 200 further includes a second control module 203. Wherein, the second control module 203 is configured to receive the target control signal of the second component and control the power balance module 202 to stop working when the target control signal is used to indicate the start of the second component.

[0099] In this embodiment, the target control signal is also the drive signal of the second component. Exemplarily, when the drive signal of the second component is the fourth level, the second control module 203 can control the power balance module 202 to stop working.

[0100] Optionally, the second control module may include a control element to control the power balance module to stop working through the control element in the second control module 203. The control element includes, but is not limited to, a Central Processing Unit (CPU), a Digital Signal Processing (DSP), a Field-Programmable Gate Array (FPGA), or other programmable logic devices.

[0101] In the above embodiment, since the second control module 203 can receive the target control signal of the second element and control the power balance module 202 to stop working when the target control signal is used to indicate the start of the second element, therefore, when the start of the second element causes the secondary side voltage to rise, the power balance module 202 can also be stopped in time, so that the energy balance between the feedback winding 101 and the secondary side winding 102 is achieved.

[0102] Please continue to refer to Figure 7 , in an exemplary embodiment, optionally, the second control module 203 includes a first switch unit 2031 and a second switch unit 2032 connected to each other, and the second switch unit 2032 is connected to the first control module 201.

[0103] Furthermore, the first switch unit 2031 is used to receive the target control signal. When the target control signal is used to indicate the start of the second element, the first switch unit 2031 will be in the conducting state and control the second switch unit 2032 to also be in the conducting state. It can be understood that when the target control signal is used to indicate the stop of the second element, the first switch unit 2031 will be in the cut-off state and control the second switch unit 2032 to also be in the cut-off state. Exemplarily, both the first switch element and the second switch element can be triodes.

[0104] Furthermore, when the second switch unit 2032 is in the conducting state, it will control the power balance module 202 to stop working through the first control module 201. Optionally, when the second switch unit 2032 is in the conducting state, it can control the switch element in the first control module 201 to disconnect, so that the power balance module 202 stops working.

[0105] In the above embodiments, the second control module 203 includes a first switch unit 2031 and a second switch unit 2032 that are connected to each other, and the second switch unit 2032 is connected to the first control module 201. Since the first switch unit 2031 can receive a target control signal and be in a conducting state when the target control signal is used to indicate the start of the second element, so as to control the second switch unit 2032 to be in a conducting state when in the conducting state. In this way, when the second switch unit 2032 is in the conducting state, it can efficiently and accurately control the power balance module 202 to stop working through the first control module 201.

[0106] In an exemplary embodiment, optionally, the second switch unit 2032 includes a first transistor Q5 and a discharging element. The discharging element is used to discharge the energy stored in the first energy storage subunit, and the discharging element includes but is not limited to a resistor.

[0107] Taking the discharging element including the resistor R16 as an example, as Figure 5 shown, both the gate and the source of the first transistor Q5 are connected to the first switch unit 2031, and the drain of the first transistor Q5 is connected to the first energy storage subunit through the discharging element.

[0108] Furthermore, the first switch unit 2031 is configured to control the first transistor Q5 to be in a conducting state when in the conducting state, so as to discharge the energy of the first energy storage subunit through the discharging element, causing the power balance module 202 to stop working. Please continue to refer to Figure 5 , after the first switch unit 2031 is turned on, the first transistor Q5 will be in a conducting state, and the electric charge on the capacitor C6 is discharged through the resistor R16, causing the optocoupler unit U1 to stop working.

[0109] In the above embodiments, since the second switch unit 2032 includes the first transistor Q5 and the discharging element, and both the gate and the source of the first transistor Q5 are connected to the first switch unit 2031, and the drain of the first transistor Q5 is connected to the first energy storage subunit through the discharging element, therefore, the first switch unit 2031 can control the first transistor Q5 to be in a conducting state when in the conducting state. In this way, the energy of the first energy storage subunit can be discharged through the discharging element, causing the power balance module 202 to stop working.

[0110] In an exemplary embodiment, optionally, the first switch unit 2031 includes a third auxiliary power supply, a second transistor Q4, a third transistor Q3, a second operational amplifier sub-unit, and a third energy storage sub-unit. Among them, the third auxiliary power supply can also be any form of current source or voltage source, and the third auxiliary power supply can be the same as or different from the first auxiliary power supply or the second auxiliary power supply. The second operational amplifier sub-unit includes at least one operational amplifier, and the third energy storage sub-unit includes, but is not limited to, a capacitor or a battery.

[0111] Taking the second operational amplifier sub-unit including the operational amplifier U1B and the third energy storage sub-unit including the capacitor C5 as an example, as Figure 5 shown, the gate of the second transistor Q4 is used to receive the target control signal FAN_PWM. The drain of the second transistor Q4 is respectively connected to the base of the third transistor Q3 and the third auxiliary power supply VCC3. The source of the second transistor Q4 is connected to the inverting input terminal of the second operational amplifier sub-unit. The emitter of the third transistor Q3 is connected to the third auxiliary power supply. The collector of the third transistor Q3 is connected to the non-inverting input terminal of the second operational amplifier sub-unit. The output terminal of the second operational amplifier sub-unit is connected to the third energy storage sub-unit, and the third energy storage sub-unit is connected to the second switch unit 2032.

[0112] Please refer to Figure 5 , if the target control signal FAN_PWM is at a high level, the second transistor Q4 is in the conducting state, the base of the third transistor Q3 is at a low level, and the third transistor Q3 is also in the conducting state. The third auxiliary power supply VCC3 is input to the non-inverting input terminal of the operational amplifier U1B through the third transistor Q3, and the voltage at the output terminal of the operational amplifier U1B charges the capacitor C5 through the RC circuit composed of the resistor R19 and the capacitor C5.

[0113] Figure 8 is a schematic diagram of the start-up process of the second component in an embodiment. Figure 8 In the (a) diagram of Figure 8 , the horizontal axis represents time, and the vertical axis represents the level of the target control signal FAN_PWM. Among them, 1 represents a high level, and 0 represents a low level. As Figure 8 shown in the (a) diagram of Figure 8 , during the soft start process of the second component, the duty cycle of the target control signal FAN_PWM gradually increases. Figure 8 In the (b) diagram of Figure 8 , the horizontal axis represents time, and the vertical axis represents the voltage of the capacitor C5. As Figure 8As shown. When the voltage of capacitor C5 is greater than the turn-on voltage of the first transistor Q5, the first transistor Q5 is in the on state, and the charge on capacitor C6 is discharged through resistor R16, causing the optocoupler unit U1 not to work and there being no current loop in resistor R7, that is, the load power of resistor R7 on the feedback winding 12V_P is removed.

[0114] In the above embodiment, since the first switching unit 2031 includes a third auxiliary power supply, a second transistor Q4, a third transistor Q3, a second operational amplifier sub-unit, and a third energy storage sub-unit, and the gate of the second transistor Q4 is used to receive the target control signal, the drain of the second transistor Q4 is respectively connected to the base of the third transistor Q3 and the third auxiliary power supply, the source of the second transistor Q4 is connected to the inverting input terminal of the second operational amplifier sub-unit, the emitter of the third transistor Q3 is connected to the third auxiliary power supply, the collector of the third transistor Q3 is connected to the non-inverting input terminal of the second operational amplifier sub-unit, the output terminal of the second operational amplifier sub-unit is connected to the third energy storage sub-unit, and the third energy storage sub-unit is connected to the second switching unit 2032. Therefore, when the target control signal is used to indicate the start of the second component, the energy of the first energy storage sub-unit can be efficiently discharged through the discharge component, causing the power balance module 202 to stop working.

[0115] In an exemplary embodiment, optionally, the power balance circuit 200 may further include at least one of the following:

[0116] (1) Resistor R7. The first end of resistor R7 is connected to the feedback winding 101, and the second end of resistor R7 is connected to the triode sub-unit in the optocoupler unit U1. (2) Resistor R8. Resistor R8 is respectively connected to the output end of the operational amplifier U1A and the capacitor C4. (3) Resistor R9. The first end of resistor R9 is used to receive the reference voltage, and the second end of resistor R9 is connected to the non-inverting input terminal of the operational amplifier U1A. (4) Resistor R10. The first end of resistor R10 is used to receive the secondary side voltage, and the second end of resistor R10 is connected to the inverting input terminal of the operational amplifier U1A. (5) Resistor R11. Resistor R11 is respectively connected to the diode sub-unit and the capacitor C7. (6) Resistor R12. Resistor R12 is respectively connected to the inverting input terminal and the output end of the operational amplifier U1A. (7) Resistor R13. The first end of resistor R13 is connected to the non-inverting input terminal of the operational amplifier U1A, and the second end of resistor R13 is grounded. (8) Resistor R14. Resistor R14 is respectively connected to the third auxiliary power supply VCC3 and the emitter of the third transistor Q3. (9) Resistor R15. Resistor R15 is respectively connected to the third auxiliary power supply VCC3 and the base of the third transistor Q3. (10) Resistor R16. Resistor R16 is respectively connected to the capacitor C6 and the drain of the first transistor Q5. (11) Resistor R17. Resistor R17 is respectively connected to the collector of the third transistor Q3 and the non-inverting input terminal of the operational amplifier U1B. (12) Resistor R18. The first end of resistor R18 is used to receive the target control signal FAN_PWM, and the second end of resistor R18 is connected to the gate of the second transistor Q4. (13) Resistor R19. Resistor R19 is respectively connected to the output end of the operational amplifier U1B and the capacitor C5. (14) Resistor R20. The first end of resistor R20 is used to receive the target control signal FAN_PWM, and the second end of resistor R20 is connected to the source of the second transistor Q4. (15) Resistor R21. Resistor R21 is respectively connected to the gate of the first transistor Q5 and the source of the second transistor Q4.

[0117] To introduce the power balance circuit 200 of the present application more clearly, the working process of Figure 5 and the energy storage power supply will be described herein.

[0118] In working process 1, the total power of the feedback winding 12V_P is 2W, and the total power of the secondary side winding 12V_S is 2W. At this time, the power of the feedback winding 12V_P is balanced with the power of the secondary side winding 12V_S, the secondary side voltage remains at 12V, the secondary side voltage is not less than the reference voltage, the output end of the operational amplifier U1A outputs a low level, and the optocoupler unit U1 does not work, that is, both the diode unit and the triode unit in the optocoupler unit U1 are in the cut-off state, and there is no current loop on the resistor R7, and the power on the feedback winding 12V_P will not be increased.

[0119] During the working process 2, the relay of the inverter circuit starts to pull in and work. Since the total power of the feedback winding 12V_P is 2W, the total power of the secondary winding 12V_S will change from 2W to 5W. During the transformation process, the secondary voltage of the secondary winding 12V_S drops. When the secondary voltage drops below the reference voltage Vref, the output terminal of the operational amplifier U1A starts to output and charges the capacitor C4, and then enters the non-inverting input terminal of the operational amplifier U3A. The output terminal of the operational amplifier U3A follows the non-inverting input terminal of the operational amplifier U3A. In this way, the voltage of the capacitor C4 can charge the capacitor C6 through the diode D3, and the voltage of the capacitor C6 then enters the non-inverting input terminal of the operational amplifier U3B. Furthermore, the output terminal of the operational amplifier U3B starts to output and charges the capacitor C7. When the voltage of the capacitor C7 is greater than the conduction voltage drop of the diode unit in the optocoupler unit U(1), the diode unit in the optocoupler unit is in the conducting state, forming a first current. Based on Figure 6 , the triode unit in the optocoupler unit U(1) also starts to conduct, forming a second current. At this time, a current loop is also formed on the resistor R7, thereby increasing the load power of the feedback winding 12V_P. The magnitude of the load power is .

[0120] It can be understood that when the secondary voltage drops, the greater the difference between the secondary voltage and the reference voltage, the higher the voltage output by the output terminal of the operational amplifier U1A, the higher the voltage of the capacitor C7, and the greater the first current and the second current. The greater the load power increased on the feedback winding 12V_P. In this way, by real-time according to the magnitude between the secondary voltage and the reference voltage, the working current of the optocoupler unit U(1) can be adjusted, and then the load power increased on the feedback winding 12V_P can be adjusted in real time to ensure that the power of the feedback winding 12V_P and the power of the secondary winding 12V_S are kept relatively balanced, so that the voltage of the secondary winding 12V_S is kept at about 12V, and the relay of the inverter circuit completes the pull-in.

[0121] Since the resistor R7 increases the load power of the feedback winding 12V_P, the secondary voltage will slowly recover to 12V, that is, the voltage of the output terminal of the operational amplifier U1A, that is, the voltage of the capacitor C4 will slowly decrease, and the power increased on the feedback winding 12V_P will also slowly decrease, causing the secondary voltage to drop. And when the difference between the secondary voltage and the reference voltage starts to increase, the voltage of the output terminal of the operational amplifier U1A starts to increase again, and the power of the resistor R7 on the feedback winding 12V_P also increases accordingly, and the voltage of the secondary winding 12V_S will also recover accordingly. It can be seen that in this process, the resistor R7 increases the load power of the feedback winding 12V_P will repeatedly increase and decrease, and the voltage of the secondary winding 12V_S will also be unstable, following the repeated increase and decrease of the horizontal jump, and there is a risk that the relay of the inverter circuit fails to maintain the pull-in due to low voltage after the pull-in.

[0122] In this embodiment, even if the voltage of the secondary winding 102 recovers to be greater than the reference voltage, due to the single-phase conductivity of the diode D3, the voltage of the capacitor C6 will not decrease accordingly. The voltage of the capacitor C6 will remain at the maximum value, enabling the resistor R7 to maintain the power required to balance the power of the feedback winding 12V_P and the power of the secondary winding 12V_S. The voltage of the secondary winding 12V_S is stabilized at 12V to avoid the risk of the relay failing to maintain its pull-in due to low voltage after it is pulled in during the process of the voltage of the secondary winding 12V_S recovering to 12V.

[0123] During operation process 3, that is, after the charging or discharging power ramps up, the fan starts soft-start operation. The power of the fan, which is 3W, is added to the feedback winding 12V_P. At the same time, the target control signal FAN_PWM is at a high level, the second transistor Q4 is in the conducting state, the base of the third transistor Q3 is at a low level, and the third transistor Q3 is also in the conducting state. The third auxiliary power supply is input to the non-inverting input terminal of the operational amplifier U1B through the third transistor Q3. The output voltage of the operational amplifier U1B charges the capacitor C5 through the RC circuit composed of the resistor R19 and the capacitor C5. As the duty cycle of FAN_PWM gradually increases, the voltage of the capacitor C5 also gradually increases. When the voltage of the capacitor C5 is greater than the turn-on voltage of the first transistor Q5, the first transistor Q5 turns on, and the charge on the capacitor C6 is discharged through the resistor R16, causing the optocoupler unit U1 to stop working and there is no current loop on the resistor R7, that is, the power of the resistor R7 on the feedback winding 12V_P is removed. At this time, after adding the 3W power of the fan to the feedback winding 12V_P, the power on the feedback winding 12V_P is the same as the power on the secondary winding 12V_S, which is 5W, keeping the energy coupling on both sides relatively balanced. The voltage of the secondary winding 12V_S continues to be maintained at 12V, enabling the energy storage power supply to operate normally for charging and discharging.

[0124] It should be noted that the resistance value of the resistor R7 needs to be such that when the secondary winding 12V_S is at full load (i.e., when the relay of the inverter circuit is pulled in), the power on the resistor R7 is large enough to keep the power on the feedback winding 12V_P and the power on the secondary winding 12V_S relatively balanced, ensuring the successful pull-in of the relay of the inverter circuit and enabling the energy storage power supply to operate normally.

[0125] It can be seen that the power balance circuit provided in this embodiment can be adjusted according to the power required by the current scenario to maintain energy balance and stabilize the secondary voltage at the required voltage. Moreover, without the need for an additional control signal, by referring to the control signal of the relevant flyback circuit, the reusability is improved.

[0126] Figure 9 Schematic diagram of an energy storage power supply in one embodiment, as Figure 9As shown, in one embodiment, an energy storage power supply 900 is further provided. The energy storage power supply 900 includes a flyback circuit 100 and the power balance circuit 200 of any one of the above.

[0127] In addition, the power balance circuit of the present application can also be used in other circuit application scenarios that need to maintain voltage by adjusting the power size, and can increase the power in real time according to the requirements of the scenario at that time to maintain the required voltage.

[0128] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., and are not limited thereto. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., and are not limited thereto.

[0129] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this application.

[0130] The above-described embodiments merely represent several implementation manners of this application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A power balance circuit applied to a flyback circuit, characterized in that The flyback circuit includes a feedback winding and a secondary winding. The power balance circuit includes a first control module and a power balance module connected to each other. The power balance module is connected to the feedback winding; The first control module is configured to receive a reference voltage and a secondary voltage of the secondary winding, and control the power balance module to stop working when the secondary voltage is greater than or equal to the reference voltage, and control the power balance module to work when the secondary voltage is less than the reference voltage; The power balance module is configured to increase the load power of the feedback winding according to the working current of the power balance module when working.

2. The power balance circuit according to claim 1, wherein The first control module includes a comparison unit and a locking unit; the locking unit is respectively connected to the comparison unit and the power balance module; The comparison unit is configured to receive the reference voltage and the secondary voltage, and control the power balance module to maintain working through the locking unit when the secondary voltage is less than the reference voltage.

3. The power balance circuit according to claim 2, wherein The first control module further includes an energy storage unit, and the energy storage unit is respectively connected to the locking unit and the power balance module; The comparison unit is configured to, when the secondary voltage is less than the reference voltage, charge the energy storage unit through the locking unit according to the difference between the secondary voltage and the reference voltage, so as to control the working current of the power balance module according to the voltage of the energy storage unit when the voltage of the energy storage unit is greater than a preset charging threshold.

4. The power balance circuit according to claim 3, characterized in that, The locking unit includes a first auxiliary power supply, a first follower subunit, a unidirectional conduction subunit, a second follower subunit, and a first energy storage subunit; the first auxiliary power supply is connected to the first follower subunit, the non-inverting input terminal of the first follower subunit is connected to the comparison unit, the inverting input terminal and the output terminal of the first follower subunit are both connected to the positive pole of the unidirectional conduction subunit, the negative pole of the unidirectional conduction subunit is connected to the first end of the first energy storage subunit, the first end of the first energy storage subunit is further connected to the non-inverting input terminal of the second follower subunit, the inverting input terminal and the output terminal of the second follower subunit are both connected to the power balance module, and the second end of the first energy storage subunit is grounded; The comparison unit is configured to output a first voltage according to the difference between the secondary voltage and the reference voltage when the secondary voltage is less than the reference voltage; The first follower subunit is configured to control the energy storage unit to be charged through the first voltage; The unidirectional conduction subunit is configured to maintain the maximum value of the voltage of the first energy storage subunit; The second follower subunit is configured to control the working current of the power balance module according to the voltage of the energy storage subunit.

5. The power balance circuit according to claim 4, wherein The inverting input terminal and the output terminal of the second follower subunit are both connected to the energy storage unit; The second follower subunit is configured to control the energy storage unit to be charged according to the voltage of the first energy storage subunit.

6. The power balance circuit according to claim 4, wherein The energy storage parameters of the first energy storage sub-unit are determined according to the drive signal for starting the first component and the drive signal for starting the second component. The secondary winding is used to supply power to the first component, and the feedback winding is used to supply power to the second component. The starting time of the first component is earlier than that of the second component.

7. The power balance circuit according to any one of claims 2-6, characterized in that, The comparison unit includes a second auxiliary power supply, a first operational amplifier sub-unit, and a second energy storage sub-unit; The second auxiliary power supply is connected to the first operational amplifier sub-unit. The non-inverting input terminal of the first operational amplifier sub-unit is used to receive the reference voltage, the inverting input terminal of the first operational amplifier sub-unit is used to receive the secondary side voltage, the output terminal of the first operational amplifier sub-unit is connected to the second energy storage sub-unit, and the second energy storage sub-unit is connected to the locking unit; The first operational amplifier sub-unit is used to control the second energy storage sub-unit to charge according to the difference between the secondary side voltage and the reference voltage when the secondary side voltage is less than the reference voltage, so as to control the power balance module to maintain operation through the locking unit according to the voltage of the second energy storage sub-unit.

8. The power balance circuit according to any one of claims 1-6, characterized in that, The power balance module includes an opto-coupler unit. The opto-coupler unit integrates a diode sub-unit and a triode sub-unit. The diode sub-unit is connected to the first control module, and the triode sub-unit is connected to the feedback winding; The first control module is used to control the diode sub-unit to be in the cut-off state when the secondary side voltage is greater than or equal to the reference voltage, and to control the diode sub-unit to be in the conducting state when the secondary side voltage is less than the reference voltage; The diode sub-unit is used to control the triode sub-unit to conduct according to the first current of the diode sub-unit when it is in the conducting state; The triode sub-unit is used to increase the load power of the feedback winding according to the second current of the triode sub-unit when it is in the conducting state.

9. The power balance circuit according to claim 4, wherein The power balance circuit further includes a second control module; The second control module is used to receive the target control signal of the second component and control the power balance module to stop operating when the target control signal is used to indicate the start of the second component.

10. The power balance circuit according to claim 9, characterized in that, The second control module includes a first switch unit and a second switch unit connected to each other. The second switch unit is connected to the first control module; The first switch unit is used to receive the target control signal and be in the conducting state when the target control signal is used to indicate the start of the second component, so as to control the second switch unit to be in the conducting state when it is in the conducting state; The second switch unit is used to control the power balance module to stop operating through the first control module when it is in the conducting state.

11. The power balance circuit according to claim 10, wherein, The second switch unit includes a first transistor and a discharging element; the gate and source of the first transistor are both connected to the first switch unit, and the drain of the first transistor is connected to the first energy storage sub-unit through the discharging element; The first switching unit is configured to control the first transistor to be in an on state when in an on state, so as to discharge the energy of the first energy storage sub-unit through the discharging element, causing the power balance module to stop working.

12. The power balance circuit according to claim 10, wherein The first switching unit includes a third auxiliary power supply, a second transistor, a third transistor, a second operational amplifier sub-unit, and a third energy storage sub-unit; The gate of the second transistor is configured to receive the target control signal. The drain of the second transistor is respectively connected to the base of the third transistor and the third auxiliary power supply. The source of the second transistor is connected to the inverting input terminal of the second operational amplifier sub-unit. The emitter of the third transistor is connected to the third auxiliary power supply. The collector of the third transistor is connected to the non-inverting input terminal of the second operational amplifier sub-unit. The output terminal of the second operational amplifier sub-unit is connected to the third energy storage sub-unit, and the third energy storage sub-unit is connected to the second switching unit.

13. A energy storage power supply, characterized in that, The energy storage power supply includes a flyback circuit and the power balance circuit according to any one of claims 1-12.

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