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

Abstract

The application relates to a power balance 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 connected with each other, and the power balance module is connected with a feedback winding. The first control module is used for receiving a reference voltage and a secondary voltage of a secondary winding, and in the case that the secondary voltage is greater than or equal to the reference voltage, the first control module controls the power balance module to stop working, and in the case that the secondary voltage is less than the reference voltage, the first control module controls the power balance module to work. 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 in the case of working. The power balance circuit can balance the power between the feedback winding and the secondary winding in the flyback circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to a power balancing circuit applied to a flyback circuit and an energy storage power supply. BACKGROUND

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

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

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

[0005] Therefore, it is necessary to provide a power balancing circuit applied to a flyback circuit and an energy storage power supply in view of the above technical problems.

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

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

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

[0010] The comparison unit is configured to receive the reference voltage and the secondary voltage, and control the power balancing 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 connected to the locking unit and the power balancing module respectively;

[0012] The comparison unit is used to control the energy storage unit to charge through the locking unit 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 operating current of the power balancing 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 conducting 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 reverse input terminal and the output terminal of the first follower subunit are both connected to the positive electrode of the unidirectional conducting subunit, the negative electrode of the unidirectional conducting subunit is connected to the first terminal of the first energy storage subunit, the first terminal of the first energy storage subunit is also connected to the non-inverting input terminal of the second follower subunit, the reverse input terminal and the output terminal of the second follower subunit are both connected to the power balancing module, and the second terminal of the first energy storage subunit is grounded;

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

[0015] A first follower subunit, configured to control charging of the energy storage unit through a first voltage;

[0016] A unidirectional conducting subunit, used to maintain the maximum voltage of the first energy storage subunit;

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

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

[0019] The second follower subunit is used 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 based on a drive signal for starting the first element and a drive signal for starting the second element, the secondary winding is used to power the first element, the feedback winding is used to power the second element, and the start-up time of the first element is earlier than the start-up 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 subunit, the non-inverting input terminal of the first operational amplifier subunit is used to receive the reference voltage, the inverting input terminal of the first operational amplifier subunit is used to receive the secondary side voltage, the output terminal of the first operational amplifier subunit is connected to the second energy storage subunit, and the second energy storage subunit is connected to the locking unit;

[0023] The first operational amplifier subunit is used to control the second energy storage subunit 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 balancing module to maintain operation through the locking unit according to the voltage of the second energy storage subunit.

[0024] In one embodiment, the power balancing 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] a first control module, configured to control the diode subunit to be in a cut-off state when the secondary voltage is greater than or equal to a reference voltage, and to control the diode subunit to be in a conduction state when the secondary voltage is less than the reference voltage;

[0026] The diode sub-unit is used to control the transistor 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 on state.

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

[0029] The second control module is configured to receive a target control signal of the second element, and control the power balancing module to stop working when the target control signal is used to instruct the second element to start.

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

[0031] a first switch unit, configured to receive a target control signal and be in an on state when the target control signal is used to instruct the second element to start, so as to control the second switch unit to be in an on state when in the on state;

[0032] The second switch unit is configured to control the power balancing module to stop working through the first control module when in the on state.

[0033] In one embodiment, the second switch unit includes a first transistor and a discharge 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 subunit through the discharge element;

[0034] The first switch unit is used to control the first transistor to be in the on state when in the on state, so as to discharge the energy of the first energy storage subunit through the discharge element, so that the power balancing module stops working.

[0035] In one embodiment, the first switch 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 used 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 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 switch unit.

[0037] In a second aspect, the present application also provides an energy storage power supply, comprising a flyback circuit and a power balancing circuit as described above.

[0038] The power balancing circuit and energy storage power supply for a flyback circuit include a first control module and a power balancing module connected to each other, wherein the power balancing module is connected to the feedback winding. The first control module is capable of receiving a reference voltage and a secondary voltage of the secondary winding, and controlling the power balancing module to stop operating when the secondary voltage is greater than or equal to the reference voltage, and to operate when the secondary voltage is less than the reference voltage. While operating, the power balancing module is capable of increasing the load power of the feedback winding based on the operating current of the power balancing module. Therefore, when the secondary voltage drops due to activation of the first element, resulting in the power of the secondary winding being 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 operating current of the power balancing module can increase the load of the feedback winding, thereby balancing the power between the feedback winding and the secondary winding. This can also prevent the energy storage power supply from failing due to activation of the first element, enabling more stable operation of the energy storage power supply and improving its reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 Schematic diagram of a flyback circuit in related art;

[0041] Figure 2 is a schematic diagram of a power balancing circuit in one embodiment;

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

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

[0044] Figure 5 is a schematic diagram of yet another power balancing circuit in one embodiment;

[0045] Figure 6 Schematic diagram of current change of an optocoupler unit in one embodiment;

[0046] Figure 7 is a schematic diagram of yet another power balancing circuit in one embodiment;

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

[0048] Figure 9 Schematic diagram of an energy storage power supply in one embodiment. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0050] Figure 1 Schematic diagram of a flyback circuit in related art, such as Figure 1 As shown, the flyback circuit 100 includes a battery voltage BAT+, a feedback winding 101 (ie Figure 1 12V_P in), diode D1, resistor R1, capacitor C1, transformer T1, resistor R2, diode D2, secondary winding 102 (i.e. Figure 1The feedback winding 12V_P is connected with the capacitor C1, the transistor Q1, the resistor R3, the resistor R4, the control integrated circuit (Control IC) 103, the capacitor C3, the resistor R5, the resistor R6 and the transistor Q2. The input (IN) pin of the control integrated circuit 103 is connected with the battery voltage BAT+, the feedback (FB) pin of the control integrated circuit 103 is connected with the collector of the transistor Q2, and the gate drive (GATE) pin of the control integrated circuit 103 is connected with the gate of the transistor Q1 through the resistor R3.

[0051] The feedback winding 12V_P can supply power for the fan, the low-voltage side switch tube drive, the display screen and the control chip in the energy storage power supply, and the secondary winding 12V_S can supply power for the relay, the high-voltage side switch tube drive and the CT in the inverter circuit. Specifically, the display screen and the control chip can be supplied with power by the feedback winding 12V_P after being converted into 5-volt (V) voltage through a voltage reduction module. For example, the power of the fan is about 3 watts (W), the power of the low-voltage side switch tube drive is about 1 W, the power of the display screen and the control chip is about 1 W, the power of the relay in the inverter circuit is about 3 W, the power of the CT is about 1 W, and the power of the high-voltage side switch tube drive is about 1 W.

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

[0053] In the working process 1, the total power of the feedback winding 12V_P is 2 W, and the total power of the secondary winding 12V_S is 2 W. 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, the secondary voltage of the secondary winding 12V_S does not change, and does not affect the normal operation of the energy storage power supply.

[0054] In the working process 2, the total power of the feedback winding 12V_P is 2 W, and the total power of the secondary winding 12V_S is 5 W. 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 decrease, and may even decrease to below the minimum attraction voltage of the relay, resulting in failure of the relay in the inverter circuit to be attracted, and causing the energy storage power supply to fail to charge or discharge.

[0055] As can be seen, due to the cross-regulation of the flyback circuit, if the energy coupling between the feedback winding and the secondary winding is unbalanced, the secondary voltage will drop, the energy storage power supply will fail, and the reliability of the energy storage power supply will be affected. Based on this, the present application provides a power balancing circuit for the flyback circuit, which will be described in detail below.

[0056] Figure 2 FIG. 1 is a schematic diagram of a power balancing circuit in one embodiment, Figure 2 As shown, in an exemplary embodiment, the flyback circuit 100 includes a feedback winding 101 and a secondary winding 102, and the power balancing circuit 200 of the flyback circuit 100 includes a first control module 201 and a power balancing module 202 connected to each other, wherein the power balancing module 202 is connected to the feedback winding 101.

[0057] Furthermore, the first control module 201 is configured to receive a reference voltage and the secondary voltage of the secondary winding 102. The secondary voltage can be obtained via a voltage sensor. The reference voltage can be understood as a reference value corresponding to the secondary voltage and can be set based on actual needs. For example, if the secondary voltage is ideally 12 volts (V), the reference voltage can be 11.5 V. If the secondary voltage is less than the reference voltage, it indicates that the secondary voltage is decreasing to maintain power balance between the feedback winding 101 and the secondary winding 102.

[0058] Furthermore, when the secondary voltage is greater than or equal to the reference voltage, the first control module 201 can control the power balancing module 202 to stop working; when the secondary voltage is less than the reference voltage, the first control module 201 can control the power balancing 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 a 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 balancing module 202, thereby stopping the operation of the power balancing module 202. If the secondary voltage is less than the reference voltage, the first control module 201 connects the switching element in the first control module 201 to connect the path between the first control module 201 and the power balancing module 202, thereby enabling the power balancing module 202 to operate.

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

[0061] Illustratively, the power balancing module 202 includes an adjustable resistor. When the power balancing module 202 is in operation, the operating current of the power balancing module 202 can be controlled by controlling the resistance value of the adjustable resistor, thereby increasing the load power of the feedback winding 101. The power balancing module 202 may also include a signal driving element and a transistor. When the power balancing module 202 is in operation, 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 balancing module 202 and increasing the load power of the feedback winding 101. The above examples only illustrate some optional methods for increasing the load power of the feedback winding 101, and the present embodiment is not limited thereto.

[0062] The power balancing circuit 200 includes a first control module 201 and a power balancing module 202 that are connected to each other. The power balancing module 202 is connected to the feedback winding 101 . Since the first control module 201 is capable of receiving a reference voltage and the secondary voltage of the secondary winding 102, and controlling the power balancing module 202 to stop operating when the secondary voltage is greater than or equal to the reference voltage, and controlling the power balancing module 202 to operate when the secondary voltage is less than the reference voltage, the power balancing module 202, while operating, can increase the load power of the feedback winding 101 according to the operating current of the power balancing module 202. Therefore, when the secondary voltage drops due to activation of the first element, resulting in the power of the secondary winding 102 being 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 by the operating current of the power balancing module 202, thereby balancing the power between the feedback winding 101 and the secondary winding 102. This can also avoid the situation where the energy storage power supply fails due to activation of the first element, allowing the energy storage power supply to operate more stably and improving the reliability of the energy storage power supply.

[0063] Figure 3 FIG. 1 is a schematic diagram of a first control module in an embodiment, as shown in FIG. Figure 3As shown, in an exemplary embodiment, optionally, the first control module 201 includes a comparison unit 2021 and a locking unit 2022. The locking unit 2022 is connected to the comparison unit 2021 and the power balancing module 202, respectively.

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

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

[0066] Further, optionally, when the secondary voltage is greater than or equal to the reference voltage, the comparison unit 2021 controls the locking unit 2022 to be in an off state, and the locking unit 2022 does not operate. When the secondary voltage is less than the reference voltage, the comparison unit 2021 controls the locking unit 2022 to be in an on state, and the locking unit 2022 operates. For example, the locking unit 2022 can be implemented by an RS flip-flop, a relay, or a self-locking circuit composed of two transistors, and this embodiment is not limited thereto.

[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 balancing module 202. Because the comparison unit 2021 can receive the reference voltage and the secondary voltage, and control the power balancing module 202 to maintain operation through the locking unit 2022 when the secondary voltage is less than the reference voltage, repeated changes in the secondary voltage can be avoided while the power balancing module 202 maintains operation, thereby improving the stability of the energy storage power supply.

[0068] Figure 4 FIG. 1 is a schematic diagram of another first control module in an embodiment, Figure 4As shown, in an exemplary embodiment, optionally, the first control module 201 further includes an energy storage unit 2023, which is respectively connected to the locking unit 2022 and the power balancing module 202. The energy storage unit 2023 includes at least one energy storage element, including but not limited to a battery or a capacitor.

[0069] Furthermore, the comparison unit 2021 is configured to control the energy storage unit 2023 to charge based on the difference between the secondary voltage and the reference voltage when the secondary voltage is less than the reference voltage, via the locking unit 2022, so that when the voltage of the energy storage unit 2023 is greater than a preset charging threshold, the operating current of the power balancing module 202 is controlled based on the voltage of the energy storage unit 2023. The preset charging threshold can be set based on actual needs and is not limited in this embodiment. In one embodiment, the preset charging threshold can be the conduction voltage drop of a diode integrated within the optocoupler unit.

[0070] Optionally, the difference between the secondary 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 voltage and the reference voltage, the greater the output voltage of the comparison unit 2021, the greater the charging current of 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 operating current of the power balancing module 202. That is, the greater the voltage of the energy storage unit 2023, the greater the operating current of the power balancing 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, which is connected to the locking unit 2022 and the power balancing module 202, respectively. Since the comparison unit 2021 can control the energy storage unit 2023 to charge via the locking unit 2022 based on the difference between the secondary voltage and the reference voltage when the secondary voltage is less than the reference voltage, and control the operating current of the power balancing module 202 based on the voltage of the energy storage unit 2023 when the voltage of the energy storage unit 2023 is greater than a preset charging threshold, the smaller the secondary voltage and the greater the difference between the secondary voltage and the reference voltage, the greater the load power added to the feedback winding 101, thereby balancing the power between the feedback winding 101 and the secondary winding 102.

[0073] In an exemplary embodiment, the locking unit 2022 optionally 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 can be any form of current source or voltage source, the first follower sub-unit and the second follower sub-unit can both include, but are not limited to, operational amplifiers, the unidirectional conduction sub-unit includes at least one diode, and the first energy storage sub-unit includes, but is not limited to, a capacitor or a battery. Figure 5 FIG. 2 is a schematic diagram of another power balancing circuit 200 according to an embodiment of the present invention. Figure 5 As shown, the following example is taken as follows: the first follower sub-unit includes an operational amplifier U3A, the unidirectional conducting sub-unit includes a diode D3, the second follower sub-unit includes an operational amplifier U3B, and the first energy storage sub-unit includes a capacitor C6.

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

[0075] Furthermore, the comparison unit 2021 is configured to output a first voltage based on the difference between the secondary voltage and the reference voltage when the secondary voltage is less than the reference voltage. The first follower sub-unit is configured to control the charging of the energy storage unit 2023 using the first voltage. The unidirectional conduction sub-unit is configured to maintain the maximum voltage of the first energy storage sub-unit. The second follower sub-unit is configured to control the operating current of the power balancing module 202 based on the voltage of the energy storage sub-unit.

[0076] Please refer to Figure 5, the output terminal of the operational amplifier U3A follows the non-inverting input terminal of the operational amplifier U3A, and in the case that the secondary voltage is less than the reference voltage, the voltage of the output terminal of the operational amplifier U3A charges the capacitor C6 through the diode D3, and then, the output terminal of the operational amplifier U3B follows the non-inverting input terminal of the operational amplifier U3B, that is, follows the voltage value of the capacitor C6. When the input value of the non-inverting input terminal of the operational amplifier U3A decreases, that is, the first voltage output by the comparison unit 2021 decreases, the voltage of the output terminal of the operational amplifier U3A will also decrease, but due to the one-way conduction of the diode D3, the voltage of the capacitor C6 will not decrease, but will remain at the maximum value of its voltage, so that the output terminal of the operational amplifier U3B follows the non-inverting input terminal of the operational amplifier U3B, that is, follows the voltage value of the capacitor C6, to control the working current of the power balance module 202 according to the voltage value of the capacitor C6.

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

[0078] In an exemplary embodiment, the reverse input terminal and the output terminal of the second following sub-unit are both connected with the energy storage unit 2023. The second following sub-unit is used to control the 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 5Taking the energy storage unit 2023 including the capacitor C7 as an example, the output end 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 the reverse input terminal and the output terminal of the second follower subunit are both connected to the energy storage unit 2023, the second follower subunit can efficiently control the energy storage unit 2023 to charge according to the voltage of the first energy storage subunit.

[0081] In an exemplary embodiment, optionally, the energy storage parameters of the first energy storage subunit are determined based on a drive signal for starting the first element and a drive signal for starting the second element, the secondary winding 102 is used to power the first element, and the feedback winding 101 is used to power the second element.

[0082] In this embodiment, the secondary voltage corresponding to the secondary winding 102 supplies power to the first component. Therefore, activation of the first component causes the secondary voltage to drop. The feedback voltage corresponding to the feedback winding 101 supplies power to the second component. Therefore, activation of the second component causes the feedback voltage to drop. Furthermore, the first component is activated earlier than the second component. The first component includes, but is not limited to, the relay in the inverter circuit described above. The second component includes, but is not limited to, the fan described above.

[0083] The driving signal of the first element is used to control the first element to start or stop working. Optionally, the driving signal of the first element includes a first level or a second level. When the driving signal of the first element is the first level, it is a driving signal for controlling the first element to stop working. When the driving signal of the first element is the second level, it is a driving signal for controlling the first element to start. The first level and the second level can be set as required. For example, 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 element is used to control the second element to start or stop working. Optionally, the drive signal of the second element includes a third level or a fourth level. When the drive signal of the second element is the third level, it is a drive signal that controls the second element to stop working. When the drive signal of the second element is the fourth level, it is a drive signal that controls the second element to start working. The third level and the fourth level can be set as required. For example, the third level can be a low level and the fourth level can be a high level.

[0085] Optionally, the time during which the first energy storage subunit maintains its maximum voltage is at least greater than or equal to a first preset time duration, which is the time duration from the time when the driving signal of the first element is activated to the time when the driving signal of the second element is activated.

[0086] In the above embodiment, since 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 winding 102 is used to power the first element, and the feedback winding is used to power the second element. The start-up time of the first element is earlier than the start-up time of the second element. Therefore, before the second element is started, the locking unit 2022 will maintain the power balancing module 202 to work, further improving the working reliability of the energy storage power supply.

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

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

[0089] Furthermore, when the secondary side voltage is lower 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. Then, according to the voltage of the second energy storage sub-unit, the power balancing module 202 can be controlled by the locking unit 2022 to maintain operation.

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

[0091] In the above embodiment, 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 a 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, therefore, 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, so as to control the power balancing 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, the power balancing module 202 optionally includes an optical coupling unit U1. The optical coupling unit U1 integrates a diode sub-unit (such as Figure 5 between pins 1 and 2 of U1) and the transistor subunit (as shown in Figure 5 As shown between pins 3 and 4 of U1 in FIG, the diode sub-unit is connected to the first control module 201, and the transistor sub-unit is connected to the feedback winding 101.

[0093] When the secondary voltage is greater than or equal to the reference voltage, the first control module 201 controls the diode sub-unit to be in the off state. When the secondary voltage is less than the reference voltage, the first control module 201 controls the diode sub-unit to be in the on state. Furthermore, when the diode sub-unit is in the on state, the transistor sub-unit is controlled to be in the on state according to the first current of the diode sub-unit. After the transistor sub-unit is in the on state, the load power of the feedback winding 101 can be increased according to the second current of the transistor sub-unit.

[0094] The first current is the current flowing through the diode sub-unit, and the second current is the collector current flowing through the transistor sub-unit. Figure 6 FIG. 1 is a schematic diagram of current variation of an optocoupler unit in an embodiment. Figure 6 As shown, within a certain range, the second current Ic of the transistor sub-unit in the optical coupling unit U1 increases as the first current IF of the diode sub-unit increases.

[0095] Please continue to refer to Figure 5If the secondary voltage is greater than or equal to the reference voltage, optocoupler unit U1 does not operate, and there is no current loop on resistor R7. If the secondary voltage is less than the reference voltage, the diode subunit in optocoupler unit U1 is turned on, forming a first current IF flowing through the diode subunit. In this case, the transistor subunit begins to conduct, forming a second current Ic flowing through the internal transistor subunit, creating a current loop on resistor R7, thereby increasing the load power of feedback winding 12V_P.

[0096] In one embodiment, the increased load power is determined according to the second current of the triode subunit and the resistance value of the resistor R7. For example, the increased load power may be equal to .

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

[0098] Figure 7 FIG. 1 is a schematic diagram of another power balancing circuit in an embodiment, Figure 7 As shown, in an exemplary embodiment, the power balancing circuit 200 optionally further includes a second control module 203. The second control module 203 is configured to receive a target control signal of the second element and control the power balancing module 202 to stop working when the target control signal is used to instruct the second element to start.

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

[0100] Optionally, the second control module may include a control element to control the power balancing 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 processor (DSP), a field programmable gate array (FPGA), or other programmable logic devices.

[0101] In the above embodiment, since the second control module 203 is capable of receiving the target control signal of the second element and controlling the power balancing module 202 to stop working when the target control signal is used to instruct the second element to start, when the start-up of the second element causes the secondary voltage to rise, the power balancing module 202 can also be stopped in time to achieve energy balance between the feedback winding 101 and the secondary winding 102.

[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 configured to receive a target control signal. When the target control signal instructs the second element to start, the first switch unit 2031 is in an on state and controls the second switch unit 2032 to also be in an on state. It will be appreciated that when the target control signal instructs the second element to stop, the first switch unit 2031 is in an off state and controls the second switch unit 2032 to also be in an off state. For example, both the first switch element and the second switch element may be transistors.

[0104] Furthermore, when the second switch unit 2032 is in the on state, it controls the power balancing module 202 to stop working through the first control module 201. Optionally, when the second switch unit 2032 is in the on state, it can control the switch element in the first control module 201 to be turned off, so that the power balancing module 202 stops working.

[0105] In the above embodiment, 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. Since the first switch unit 2031 can receive the target control signal and be in the on state when the target control signal is used to instruct the second element to start, and thus control the second switch unit 2032 to be in the on state when in the on state, when the second switch unit 2032 is in the on state, it can efficiently and accurately control the power balancing 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 discharge element, wherein the discharge element is used to discharge the energy stored in the first energy storage subunit, and the discharge element includes but is not limited to a resistor.

[0107] Take the discharge element including resistor R16 as an example, Figure 5 As shown, the gate and source of the first transistor Q5 are both 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 discharge element.

[0108] Furthermore, the first switch unit 2031 is used to control the first transistor Q5 to be in the on state when in the on state, so as to discharge the energy of the first energy storage subunit through the discharge element, so that the power balancing module 202 stops working. Figure 5 After the first switch unit 2031 is turned on, the first transistor Q5 is in the on state, and the charge on the capacitor C6 is discharged through the resistor R16, so that the optical coupling unit U1 stops working.

[0109] In the above embodiment, since the second switch unit 2032 includes the first transistor Q5 and the discharge element, and the gate and source of the first transistor Q5 are both 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 discharge element, the first switch unit 2031 can control the first transistor Q5 to be in the on state when it is in the on state. In this way, the energy of the first energy storage subunit can be discharged through the discharge element, so that the power balancing module 202 stops working.

[0110] In an exemplary embodiment, the first switching unit 2031 optionally 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. The third auxiliary power supply may be any form of current source or voltage source, and may 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 subunit including the operational amplifier U1B and the third energy storage subunit including the capacitor C5 as an example, Figure 5 As 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 on state, the base of the third transistor Q3 is at a low level, and the third transistor Q3 is also in the on 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 FIG. 1 is a schematic diagram of a second component startup process in one embodiment. Figure 8 Figure (a) shows the change of the target control signal FAN_PWM over time. Figure 8 In (a), the horizontal axis represents time, and the vertical axis represents the level of the target control signal FAN_PWM, where 1 represents a high level and 0 represents a low level. Figure 8 As shown in Figure (a), during the soft start process of the second element, the duty cycle of the target control signal FAN_PWM gradually increases. Figure 8 Figure (b) shows how the voltage of capacitor C5 changes with time. Figure 8 The horizontal axis of Figure (b) represents time, and the vertical axis represents the voltage of capacitor C5, as shown in Figure 8 As shown in Figure (b), during the soft start process of the second element, the voltage of capacitor C5 also gradually increases. The relationship diagram is shown in Figure 8When the voltage of capacitor C5 is greater than the turn-on voltage of first transistor Q5, first transistor Q5 is in the on state, and the charge on capacitor C6 is discharged through resistor R16, so that optocoupler unit U1 does not work and there is no current loop on resistor R7, that is, the load power of resistor R7 on feedback winding 12V_P is removed.

[0114] In the above embodiment, since the first switch unit 2031 includes the third auxiliary power supply, the second transistor Q4, the third transistor Q3, the second operational amplifier sub-unit and the 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 switch unit 2032, when the target control signal is used to instruct the second element to start, the energy of the first energy storage sub-unit can be efficiently discharged through the discharge element, so that the power balancing module 202 stops working.

[0115] In an exemplary embodiment, optionally, the power balancing 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 transistor sub-unit in the optocoupler unit U1. (2) Resistor R8. Resistor R8 is connected to the output end of operational amplifier U1A and capacitor C4 respectively. (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 end of 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 end of operational amplifier U1A. (5) Resistor R11. Resistor R11 is connected to the diode sub-unit and capacitor C7 respectively. (6) Resistor R12. Resistor R12 is connected to the inverting input end and output end of operational amplifier U1A respectively. (7) Resistor R13. The first end of resistor R13 is connected to the non-inverting input end of operational amplifier U1A, and the second end of resistor R13 is grounded. (8) Resistor R14. Resistor R14 is connected to the third auxiliary power supply VCC3 and the emitter of the third transistor Q3, respectively. (9) Resistor R15. Resistor R15 is connected to the third auxiliary power supply VCC3 and the base of the third transistor Q3, respectively. (10) Resistor R16. Resistor R16 is connected to capacitor C6 and the drain of the first transistor Q5, respectively. (11) Resistor R17. Resistor R17 is connected to the collector of the third transistor Q3 and the non-inverting input terminal of the operational amplifier U1B, respectively. (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 connected to the output terminal of the operational amplifier U1B and capacitor C5, respectively. (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. The resistor R21 is connected to the gate of the first transistor Q5 and the source of the second transistor Q4, respectively.

[0117] In order to more clearly introduce the power balancing circuit 200 of the present application, Figure 5 The working process of the energy storage power supply is explained.

[0118] 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 balanced with the power of the secondary winding 12V_S, the secondary voltage is maintained at 12V, and the secondary 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, the diode unit and the transistor unit in the optocoupler unit U1 are both in the cut-off state. There is no current loop on the resistor R7, and the power on the feedback winding 12V_P will not be increased.

[0119] In working process 2, the relay of the inverter circuit starts to energize 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 to less than the reference voltage Vref, the output of the operational amplifier U1A starts to output and charges the capacitor C4, and then enters the non-inverting input of the operational amplifier U3A. The output of the operational amplifier U3A follows the non-inverting input 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 of the operational amplifier U3B. Then, the output 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 U1, the diode unit in the coupling unit is in the on state, forming a first current. Based on Figure 6 , then the transistor unit in the optocoupler unit U1 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 load power is .

[0120] It is understandable 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, the greater the first current and the second current, and the greater the load power added to the feedback winding 12V_P. In this way, by adjusting the difference between the secondary voltage and the reference voltage in real time, the operating current of the optocoupler unit U1 can be adjusted, and the load power added to 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 remain relatively balanced, so that the voltage of the secondary winding 12V_S remains at approximately 12V, and the relay of the inverter circuit is completely attracted.

[0121] As resistor R7 increases the load power on feedback winding 12V_P, the secondary voltage slowly returns to 12V. This means the voltage at the output of op amp U1A, and therefore the voltage of capacitor C4, slowly decreases. The power applied to feedback winding 12V_P also slowly decreases, causing the secondary voltage to drop. When the difference between the secondary voltage and the reference voltage begins to increase, the voltage at the output of op amp U1A begins to increase again, increasing the power applied to feedback winding 12V_P by resistor R7, and the voltage on secondary winding 12V_S recovers. This indicates that during this process, resistor R7 repeatedly increases and decreases as the load power on feedback winding 12V_P increases, causing the voltage on secondary winding 12V_S to become unstable, repeatedly increasing and decreasing. This poses a risk of the inverter circuit's relay failing to remain closed after closing due to low voltage.

[0122] In this embodiment, even if the voltage of the secondary winding 102 recovers to a level 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, and the voltage of the capacitor C6 will remain at the maximum value, so that the resistor R7 maintains the power required to balance the power of the feedback winding 12V_P and the power of the secondary winding 12V_S, and the voltage of the secondary winding 12V_S is stabilized at 12V, so as to avoid the risk of the relay failing to remain energized due to low voltage after it is energized during the process of the secondary winding 12V_S voltage recovering to 12V.

[0123] In operation process 3, after the charging or discharging power is established, the fan begins soft-start operation. The fan's power of 3W is applied to the feedback winding 12V_P. Simultaneously, the target control signal FAN_PWM is high, the second transistor Q4 is on, and the base of the third transistor Q3 is low, also on. The third auxiliary power supply is input to the non-inverting input of the operational amplifier U1B via the third transistor Q3. The output voltage of the operational amplifier U1B charges capacitor C5 through the RC circuit formed by resistor R19 and capacitor C5. As the FAN_PWM duty cycle increases, the voltage on capacitor C5 also increases. When the voltage on capacitor C5 exceeds the turn-on voltage of the first transistor Q5, the first transistor Q5 turns on, and the charge on capacitor C6 is discharged through resistor R16, disabling the optocoupler unit U1. This eliminates the current loop on resistor R7, effectively removing the power from the feedback winding 12V_P. At this point, after the upper fan power is increased by 3W, the feedback winding 12V_P and the power on the secondary winding 12V_S are the same at 5W, ensuring a relatively balanced energy coupling between the two sides. The voltage on the secondary winding 12V_S remains at 12V, allowing the energy storage power supply to maintain normal charging and discharging operations.

[0124] It should be noted that the resistance value of resistor R7 must be sufficient to ensure that when the secondary winding 12V_S is fully loaded (that is, when the relay of the inverter circuit is energized), the power on resistor R7 is large enough to maintain a relative balance between the power on the feedback winding 12V_P and the power on the secondary winding 12V_S. This ensures that the relay of the inverter circuit is successfully energized and the energy storage power supply operates normally.

[0125] As can be seen, the power balancing circuit provided in this embodiment can be adjusted based on the power required by the scenario to maintain energy balance and stabilize the secondary voltage at the required voltage. Furthermore, no additional control signals are required, and by referencing the control signals of the related flyback circuit, reusability is improved.

[0126] Figure 9 FIG. 1 is a schematic diagram of an energy storage power supply in one embodiment, as shown in FIG. 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 any one of the above-mentioned power balancing circuits 200 .

[0127] In addition, the power balancing circuit of the present application can also be used in other circuit application scenarios that require maintaining voltage by adjusting power. The power can be increased in real time according to the needs of the current scenario to maintain the required voltage.

[0128] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the 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-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this 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), magnetic 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 take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0129] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, 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, they should be considered to be within the scope of this application.

[0130] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A power balancing circuit applied to a flyback circuit, characterized in that: The flyback circuit includes a feedback winding and a secondary winding, 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; The first control module is configured to receive a reference voltage and a 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; The power balancing module is configured to increase the load power of the feedback winding according to the operating current of the power balancing module when in operation; Wherein, the first control module includes a comparison unit, a locking unit and an energy storage unit; the locking unit is connected to the comparison unit and the power balancing module respectively; the energy storage unit is connected to the locking unit and the power balancing module respectively; The locking unit includes a first auxiliary power supply, a first follower sub-unit, a unidirectional conducting sub-unit, a second follower sub-unit and a first energy storage sub-unit; the first auxiliary power supply is connected to the power pin of the first follower sub-unit, the non-inverting input terminal of the first follower sub-unit is connected to the output terminal of the comparison unit, the reverse input terminal and the output terminal of the first follower sub-unit are both connected to the positive electrode of the unidirectional conducting sub-unit, the negative electrode of the unidirectional conducting sub-unit is connected to the first terminal of the first energy storage sub-unit, the first terminal of the first energy storage sub-unit is also connected to the non-inverting input terminal of the second follower sub-unit, the reverse input terminal and the output terminal of the second follower sub-unit are both connected to the power balancing module, and the second terminal of the first energy storage sub-unit is grounded; The comparison unit is configured to output a first voltage according to a difference between the secondary voltage and the reference voltage when the secondary voltage is lower than the reference voltage; The first follower subunit is configured to control the energy storage unit to charge by using the first voltage; The unidirectional conducting sub-unit is used to maintain the maximum voltage of the first energy storage sub-unit; The second follower subunit is used to control the operating current of the power balancing module according to the voltage of the first energy storage subunit.

2. The power balancing circuit according to claim 1, wherein: The reverse input terminal and the output terminal of the second follower subunit are both connected to the energy storage unit; The second follower subunit is used to control the energy storage unit to charge according to the voltage of the first energy storage subunit.

3. The power balancing circuit according to claim 1, wherein: The energy storage parameters of the first energy storage subunit are determined based on the drive signal used to start the first element and the drive signal used to start the second element. The secondary winding is used to power the first element, and the feedback winding is used to power the second element. The start-up time of the first element is earlier than the start-up time of the second element.

4. The power balancing circuit according to any one of claims 1 to 3, characterized in that: The comparison unit includes a second auxiliary power supply, a first operational amplifier subunit and a second energy storage subunit; The second auxiliary power supply is connected to the power pin of the first operational amplifier subunit, the non-inverting input terminal of the first operational amplifier subunit is used to receive the reference voltage, the inverting input terminal of the first operational amplifier subunit is used to receive the secondary side voltage, the output terminal of the first operational amplifier subunit is connected to the first terminal of the second energy storage subunit, and the second terminal of the second energy storage subunit is connected to the locking unit; The first operational amplifier subunit is configured to control the second energy storage subunit 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 balancing module to maintain operation through the locking unit according to the voltage of the second energy storage subunit.

5. The power balancing circuit according to any one of claims 1 to 3, characterized in that: The power balancing module includes an optical coupling unit, the optical coupling unit integrating 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 configured to control the diode subunit to be in a cut-off state when the secondary voltage is greater than or equal to the reference voltage, and to control the diode subunit to be in a conducting state when the secondary voltage is less than the reference voltage; The diode sub-unit is configured to control the transistor sub-unit to conduct according to the first current of the diode sub-unit when the diode sub-unit 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 on state.

6. The power balancing circuit according to any one of claims 1 to 3, characterized in that: The power balancing circuit further includes a second control module; The second control module is configured to receive a target control signal of the second element, and control the power balancing module to stop working when the target control signal is used to instruct the second element to start.

7. The power balancing circuit according to claim 6, characterized in that: The second control module includes a first switch unit and a second switch unit connected to each other, and the second switch unit is connected to the first control module; The first switch unit is configured to receive the target control signal and be in an on state when the target control signal is used to instruct the second element to start, so as to control the second switch unit to be in an on state when in the on state; The second switch unit is configured to control the power balancing module to stop working through the first control module when in the on state.

8. The power balancing circuit according to claim 7, characterized in that: The second switch unit includes a first transistor and a discharge element; the gate and source of the first transistor are both connected to the output end of the first switch unit, and the drain of the first transistor is connected to the first energy storage subunit through the discharge element; The first switch unit is configured to control the first transistor to be in the on state when in the on state, so as to discharge the energy of the first energy storage subunit through the discharge element, so that the power balancing module stops working.

9. The power balancing circuit according to claim 8, characterized in that: The first switch unit includes a third auxiliary power supply, a second transistor, a third transistor, a second operational amplifier subunit and a third energy storage subunit; The gate of the second transistor is used 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 first terminal of the third energy storage sub-unit, the first terminal of the third energy storage sub-unit is also connected to the gate of the first transistor, and the second terminal of the third energy storage sub-unit is grounded.

10. An energy storage power supply, characterized in that: The energy storage power supply includes a flyback circuit and a power balancing circuit according to any one of claims 1 to 9.

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