Conversion circuit and energy storage power supply applied to flyback circuit

Abstract

The present application relates to a conversion circuit and energy storage power supply for a flyback circuit. The conversion circuit includes a first control module and a voltage conversion module. The voltage conversion module includes a first conversion unit and a second conversion unit. The conversion efficiency of the second conversion unit is lower than the conversion efficiency of the first conversion unit. The first control module is used to control the conduction of a first path between the feedback winding and the first conversion unit when the flyback circuit does not meet the switching conditions, and to control the conduction of a second path between the feedback winding and the second conversion unit when the flyback circuit meets the switching conditions. The voltage conversion module is used to convert the feedback voltage of the feedback winding to a preset voltage via the first conversion unit or the second conversion unit. The switching conditions include the power of the secondary winding of the flyback circuit being greater than the power of the feedback winding, and the difference between the power of the secondary winding and the power of the feedback winding being greater than a preset difference. This conversion circuit can improve the reliability of the energy storage power supply.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a conversion circuit and an energy storage power supply applied to a flyback circuit. Background Art

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

[0003] In the related art, a flyback circuit is generally used to output different supply voltages, so that the supply voltage output by the flyback circuit is used to power the above-mentioned components.

[0004] However, due to the transformer leakage inductance in the flyback circuit, the flyback circuit has a cross-regulation rate, and therefore, the reliability of the current energy storage power supply is not high. Summary of the Invention

[0005] Based on this, it is necessary to provide a conversion circuit and energy storage power supply that can be more reliably applied to a flyback circuit in order to address the above technical problems.

[0006] In a first aspect, the present application provides a conversion circuit for a flyback circuit, comprising a first control module and a voltage conversion module, wherein the first control module is connected to the voltage conversion module and a feedback winding of the flyback circuit, respectively; the voltage conversion module comprises a first conversion unit and a second conversion unit, wherein the conversion efficiency of the second conversion unit is lower than the conversion efficiency of the first conversion unit;

[0007] a first control module, configured to control a first path between the feedback winding and the first conversion unit to be conductive if the flyback circuit does not meet a switching condition, and to control a second path between the feedback winding and the second conversion unit to be conductive if the flyback circuit meets a switching condition; the switching condition including that the power of the secondary winding of the flyback circuit is greater than the power of the feedback winding, and the difference between the power of the secondary winding and the power of the feedback winding is greater than a preset difference;

[0008] The voltage conversion module is used to convert the feedback voltage of the feedback winding into a preset voltage through the first conversion unit or the second conversion unit.

[0009] In one embodiment, the first control module is further configured to receive a first control signal of the first component, and when the first control signal is at a first level for controlling the first component to stop working, determine that the flyback circuit does not meet the switching condition, so as to control the first path to be turned on; and when the first control signal is at a second level for controlling the first component to start working, determine that the flyback circuit meets the switching condition, so as to control the second path to be turned on;

[0010] The secondary winding is used to supply power to the first element.

[0011] In one embodiment, the first control module includes a relay control unit and a relay switching unit, the relay switching unit is respectively connected to the relay control unit, the input end of the voltage conversion module and the feedback winding of the flyback circuit, and the relay control unit is also connected to the feedback winding;

[0012] a relay control unit, configured to receive a first control signal, output a first switching signal to the relay switching unit when the first control signal is at a first level, and output a second switching signal to the relay switching unit when the first control signal is at a second level;

[0013] The relay switching unit is configured to control the first path to be conductive when a first switching signal is received, and to control the second path to be conductive when a second switching signal is received.

[0014] In one embodiment, the relay control unit includes a first subunit and a second subunit connected to each other; the first subunit is used to receive a first control signal, and the second subunit is connected to the relay switching unit;

[0015] The first subunit is configured to be in an off state when the first control signal is at a first level, and control the second subunit to be in an off state so that the second subunit outputs a first switching signal to the relay switching unit; and to be in an on state when the first control signal is at a second level, and control the second subunit to be in an on state so that the second subunit outputs a second switching signal to the relay switching unit.

[0016] In one embodiment, the first subunit includes a first transistor, and the second subunit includes a second transistor;

[0017] The base of the first transistor is used to receive the first control signal, the collector of the first transistor is connected to the base of the second transistor, and the emitter of the first transistor is grounded;

[0018] The base of the second transistor is also connected to the feedback winding, the emitter of the second transistor is connected to the feedback winding through the relay switching unit, and the collector of the second transistor is grounded.

[0019] In one embodiment, the relay switching unit includes a coil, a first contact, a second contact, and a third contact; the first end of the coil is connected to the feedback winding, and the second end of the coil is connected to the relay control unit; the first contact is connected to the feedback winding, the second contact is connected to the input end of the first conversion unit, and the third contact is connected to the input end of the second conversion unit;

[0020] The relay switching unit is used to control the feedback winding to stop energizing the coil and connect the first contact and the second contact to conduct the first path when receiving the first switching signal; and to control the feedback winding to energize the coil and connect the first contact and the third contact to switch to conduction of the second path when receiving the second switching signal.

[0021] In one embodiment, the first control module includes a first switch unit, a second switch unit, and a third switch unit; the first switch unit is connected to the second switch unit and the third switch unit respectively, the second switch unit is connected to the feedback winding and the first conversion unit respectively, and the third switch unit is connected to the feedback winding and the second conversion unit respectively;

[0022] a first switch unit, configured to receive a first control signal, and be in an off state when the first control signal is at a first level, and be in an on state when the first control signal is at a second level;

[0023] a second switch unit, configured to be in an on state when the first switch unit is in an off state and control the first path to be on, and to be in an off state when the first switch unit is in an on state and control the first path to be off;

[0024] The third switch unit is configured to be in an off state when the first switch unit is in an off state and control the second path to be disconnected, and to be in an on state when the first switch unit is in an on state and control the second path to be connected.

[0025] In one embodiment, the first switch unit includes a third transistor, the second switch unit includes a fourth transistor, and the third switch unit includes a fifth transistor;

[0026] The gate of the third transistor is used to receive the first control signal, the source of the third transistor is grounded, and the drain of the third transistor is connected to the base of the fourth transistor and the base of the fifth transistor respectively;

[0027] The emitter of the fourth transistor is grounded, the collector of the fourth transistor is connected to the first conversion unit, and the base of the fourth transistor is also connected to the feedback winding;

[0028] An emitter of the fifth transistor is connected to the feedback winding, and a collector of the fifth transistor is connected to the second conversion unit.

[0029] In one embodiment, the first control module further includes a first one-way conducting unit and a second one-way conducting unit;

[0030] The positive electrode of the first unidirectional conductive unit is connected to the base of the fourth transistor, and the negative electrode of the first unidirectional conductive unit is connected to the drain of the third transistor;

[0031] The anode of the second unidirectional conductive unit is connected to the base of the fifth transistor, and the cathode of the second unidirectional conductive unit is connected to the drain of the third transistor.

[0032] In one embodiment, the first control module further includes a fourth switch unit, and the fourth switch unit includes a sixth transistor;

[0033] An emitter of the sixth transistor is connected to the feedback winding, a collector of the sixth transistor is connected to the first conversion unit, and a base of the sixth transistor is connected to the collector of the fourth transistor.

[0034] In one embodiment, the conversion circuit further includes a second control module; the second control module is connected to the first control module;

[0035] The second control module is configured to respond to a second control signal of the second element and control the first control module to conduct the first path when the second control signal is used to instruct the second element to start.

[0036] In a second aspect, the present application further provides an energy storage power supply, comprising a flyback circuit and a conversion circuit as described in any one of the above items.

[0037] In the above-mentioned conversion circuit and energy storage power supply applied to the flyback circuit, the conversion circuit includes a first control module and a voltage conversion module. The first control module is respectively connected to the voltage conversion module and the feedback winding of the flyback circuit. The voltage conversion module includes a first conversion unit and a second conversion unit. The switching conditions include that the power of the secondary winding of the flyback circuit is greater than the power of the feedback winding, and the difference between the power of the secondary winding and the power of the feedback winding is greater than a preset difference. Since the first control module can control the first path between the feedback winding and the first conversion unit to be conductive when the flyback circuit does not meet the switching conditions, and control the second path between the feedback winding and the second conversion unit to be conductive when the flyback circuit meets the switching conditions, the voltage conversion module converts the feedback voltage of the feedback winding into a preset voltage through the first conversion unit or the second conversion unit. Moreover, the conversion efficiency of the second conversion unit is lower than that of the first conversion unit. Therefore, when the secondary voltage drops due to the startup 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 load of the feedback winding can be increased by the second conversion unit with low conversion efficiency, so that the power of the feedback winding is balanced with the power of the secondary winding, thereby avoiding the failure of the energy storage power supply to operate due to the startup of the first element, allowing the energy storage power supply to operate more stably and improving the reliability of the energy storage power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] Figure 1 Schematic diagram of a flyback circuit in related art;

[0040] Figure 2 FIG1 is a schematic diagram of a conversion circuit in one embodiment;

[0041] Figure 3 FIG1 is a schematic diagram of a first control module according to an embodiment;

[0042] Figure 4 FIG2 is a second schematic diagram of a conversion circuit in one embodiment;

[0043] Figure 5 This is a second schematic diagram of a first control module in one embodiment;

[0044] Figure 6 FIG3 is a third schematic diagram of a conversion circuit in one embodiment;

[0045] Figure 7 FIG4 is a fourth schematic diagram of a conversion circuit in one embodiment;

[0046] Figure 8 FIG5 is a fifth schematic diagram of a conversion circuit in one embodiment;

[0047] Figure 9 Schematic diagram of an energy storage power supply in one embodiment. DETAILED DESCRIPTION

[0048] 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.

[0049] 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 1 12V_S in the battery), capacitor C2, transistor Q1, resistors R3 and R4, control integrated circuit (Control IC) 103, capacitor C3, resistors R5 and R6, and transistor Q2. The input (IN) pin of control integrated circuit 103 is connected to the battery voltage BAT+, the feedback (FB) pin of control integrated circuit 103 is connected to the collector of transistor Q2, and the gate drive (GATE) pin of control integrated circuit 103 is connected to the gate of transistor Q1 through resistor R3. GND and GND1 represent different ground terminals.

[0050] The feedback winding 12V_P powers the fan, low-voltage side switch driver, display, and control chip in the energy storage power supply. The secondary winding 12V_S powers the inverter circuit's relays, high-voltage side switch driver, and CT. Specifically, the display and control chip are powered by the feedback winding 12V_P, which is converted to 5 volts (V) via a step-down module. For example, the fan draws approximately 3 watts (W); the low-voltage side switch driver draws approximately 1 W; the display and control chip draw approximately 1 W; the inverter circuit's relay draws approximately 3 W; the CT draws approximately 1 W; and the high-side switch driver draws approximately 1 W.

[0051] 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 working; Working process 2, the relay of the inverter circuit is energized; Working process 3: the fan starts working after the charging or discharging power of the energy storage power supply is stable.

[0052] 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 and the power of the secondary winding 12V_S are relatively balanced, 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.

[0053] 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 greater than the power of the feedback winding 12V_P. Therefore, the secondary voltage of the secondary winding 12V_S will drop, and may even drop below the minimum pull-in voltage of the relay, causing the relay of the inverter circuit to fail to pull in, resulting in the energy storage power supply failing to charge or discharge.

[0054] 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 conversion circuit for use in a flyback circuit, which will be described in detail below.

[0055] Figure 2 FIG. 1 is a schematic diagram of a conversion circuit in one embodiment, as shown in FIG. Figure 2 As shown, in an exemplary embodiment, the conversion circuit 200 includes a first control module 201 and a voltage conversion module 202. The first control module 201 is connected to the voltage conversion module 202 and the feedback winding 101 of the flyback circuit 100, respectively. The voltage conversion module 202 includes a first conversion unit 2021 and a second conversion unit 2022.

[0056] Furthermore, the conversion efficiency of the second conversion unit 2022 is lower than the conversion efficiency of the first conversion unit 2021. In other words, the ratio of the output power to the input power of the second conversion unit 2022 is lower than the ratio of the output power to the input power of the first conversion unit 2021.

[0057] Optionally, the first conversion unit 2021 includes, but is not limited to, a buck converter (BUCK) circuit, a linear voltage regulator module, a traditional transformer, a low-resistance load device, etc. The second conversion unit 2022 includes, but is not limited to, a linear voltage regulator (LDO), a direct current (DC-DC) conversion module, and a high-resistance load device. The DC-DC conversion module may be an LLC, a buck converter, a boost converter, a buck-boost converter, a forward converter, or a push-pull converter. For example, if the first conversion unit 2021 is a buck circuit and the second conversion unit 2022 is an LDO, the buck circuit has a conversion efficiency of approximately 96%, while the LDO has a conversion efficiency of approximately 50%.

[0058] Furthermore, the first control module 201 is used to control the first path between the feedback winding 101 and the first conversion unit 2021 to be conductive when the flyback circuit 100 does not meet the switching condition, and to control the second path between the feedback winding 101 and the second conversion unit 2022 to be conductive when the flyback circuit 100 meets the switching condition.

[0059] The switching condition includes that the power of the secondary winding 102 of the flyback circuit 100 is greater than the power of the feedback winding 101, and the difference between the power of the secondary winding 102 and the power of the feedback winding 101 is greater than a preset difference. The preset difference is a number greater than 0 and can be set as needed.

[0060] Optionally, the first control module 201 may include at least one switching element. Thus, when the flyback circuit 100 does not meet the switching condition, the first path may be conducted via the switching element in the first control module 201. When the flyback circuit 100 meets the switching condition, the second path may be conducted via the switching element in the first control module 201. The switching element includes, but is not limited to, a manual switch, a relay, an insulated gate bipolar transistor (IGBT), and a metal-oxide-semiconductor field-effect transistor (MOSFET). For example, the switching element in the first control module may be a single-pole double-throw switch.

[0061] Further optionally, the first control module 201 may obtain and determine the power of the secondary winding 102 and the power of the feedback winding 101 of the flyback circuit 100 through a sensor to determine whether the flyback circuit 100 meets the switching condition.

[0062] In some embodiments, the first control module may further include a control element to control a switch element in the first control module through the control element in the first control module to achieve conduction of the first path or the second path. 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.

[0063] Furthermore, the voltage conversion module 202 is configured to convert the feedback voltage of the feedback winding 101 into a preset voltage via the first conversion unit 2021 or the second conversion unit 2022. In other words, when the flyback circuit 100 does not meet the switching condition, the first conversion unit 2021 operates while the second conversion unit 2022 does not operate, and the voltage conversion module 202 converts the feedback voltage of the feedback winding 101 into the preset voltage via the first conversion unit 2021. When the flyback circuit 100 meets the switching condition, the first conversion unit 2021 does not operate while the second conversion unit 2022 operates, and the voltage conversion module 202 converts the feedback voltage of the feedback winding 101 into the preset voltage via the second conversion unit 2022. The preset voltage is set as required, for example, 5V.

[0064] In the conversion circuit 200 described above, the first control module 201 is connected to the voltage conversion module 202 and the feedback winding 101 of the flyback circuit 100, respectively. The voltage conversion module 202 includes a first conversion unit 2021 and a second conversion unit 2022. The switching conditions include the power of the secondary winding 102 of the flyback circuit 100 being greater than the power of the feedback winding 101, and the difference between the power of the secondary winding 102 and the power of the feedback winding 101 being greater than a preset difference. Because the first control module 201 can control the first path between the feedback winding 101 and the first conversion unit 2021 to be conductive when the flyback circuit 100 does not meet the switching conditions, and control the second path between the feedback winding 101 and the second conversion unit 2022 to be conductive when the flyback circuit 100 meets the switching conditions, the voltage conversion module 202 converts the feedback voltage of the feedback winding 101 to a preset voltage through the first conversion unit 2021 or the second conversion unit 2022. In addition, the conversion efficiency of the second conversion unit 2022 is lower than the conversion efficiency of the first conversion unit 2021. Therefore, when the first element is started and causes the secondary voltage to drop, 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 second conversion unit 2022 with low conversion efficiency, so that the power of the feedback winding 101 is balanced with the power of the secondary winding 102, thereby avoiding the failure of the energy storage power supply to operate due to the start-up of the first element, allowing the energy storage power supply to operate more stably and improving the reliability of the energy storage power supply.

[0065] In an exemplary embodiment, the first control module 201 is optionally further configured to receive a first control signal for a first element. The secondary winding 102 is configured to power the first element. That is, activation of the first element causes the secondary voltage to drop, resulting in the power of the secondary winding 102 being greater than the power of the feedback winding 101, and the difference between the power of the secondary winding 102 and the power of the feedback winding 101 being greater than a preset difference, thereby causing an imbalance in the energy coupling between the feedback winding and the secondary winding. Exemplarily, the first element includes, but is not limited to, a relay in the aforementioned inverter circuit.

[0066] The first control signal is used to control the first element to start or stop working. The first control signal includes a first level or a second level. When the first control signal is at the first level, the first control signal is used to control the first element to stop working. When the first control signal is at the second level, the first control signal is used to control the first element to start working. 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.

[0067] Furthermore, when the first control signal is at a first level, the first control module 201 determines that the flyback circuit 100 does not meet the switching condition and controls the first path to be turned on; when the first control signal is at a second level, the first control module 201 determines that the flyback circuit 100 meets the switching condition and controls the second path to be turned on.

[0068] In the above embodiment, since the first control module 201 is also used to receive the first control signal of the first element, and the secondary winding 102 is used to power the first element, the first control signal can reflect the startup status of the first element. Furthermore, since the first control module 201 can determine that the flyback circuit 100 does not meet the switching condition when the first control signal is at a first level for controlling the first element to stop working, thereby controlling the first path to be conductive; and can determine that the flyback circuit 100 meets the switching condition when the first control signal is at a second level for controlling the first element to start working, thereby controlling the second path to be conductive, based on the first control signal, the voltage conversion module 202 can be flexibly and efficiently controlled to perform voltage conversion while maintaining energy balance between the feedback winding 101 and the secondary winding 102.

[0069] Figure 3 FIG1 is a schematic diagram of a first control module in an embodiment. In an exemplary embodiment, the first control module 201 optionally includes a relay control unit 2011 and a relay switching unit 2012. The relay switching unit 2012 is connected to the relay control unit 2011, the input end of the voltage conversion module 202, and the feedback winding 101 of the flyback circuit 100, respectively. The relay control unit 2011 is also connected to the feedback winding 101.

[0070] Furthermore, the relay control unit 2011 is configured to receive a first control signal. When the first control signal is at a first level, the relay control unit 2011 outputs a first switching signal to the relay switching unit 2012. When the first control signal is at a second level, the relay control unit 2011 outputs a second switching signal to the relay switching unit 2012.

[0071] It is understood that the first switching signal and the second switching signal are different. Optionally, the first switching signal and the second switching signal can be signals of different levels. For example, the first switching signal is a high level and the second switching signal is a low level. Of course, the first switching signal can also be a low level and the second switching signal is a high level. In some embodiments, the first switching signal and the second switching signal can also be different digital signals or other forms of electrical signals, and this embodiment is not limited to this.

[0072] Optionally, the relay control unit 2011 may include at least one switching element. The switching element in the relay control unit 2011 is in an off state when receiving a first level, and is in an on state when receiving a second level.

[0073] Furthermore, the relay switching unit 2012 controls the first path to be conductive upon receiving a first switching signal, and controls the second path to be conductive upon receiving a second switching signal. Optionally, the relay switching unit 2012 may also include at least one switching element. The switching element in the relay switching unit 2012 connects the first path upon receiving the first switching signal, and connects the second path upon receiving the second switching signal. Further, optionally, the relay switching unit 2012 controls the first path to be conductive when the relay control unit 2011 is in the off state, and controls the second path to be conductive when the relay control unit 2011 is in the on state.

[0074] In the above embodiment, the first control module 201 includes a relay control unit 2011 and a relay switching unit 2012. The relay switching unit 2012 is respectively connected to the relay control unit 2011, the input end of the voltage conversion module 202, and the feedback winding 101 of the flyback circuit 100. The relay control unit 2011 is also connected to the feedback winding 101. Because the relay control unit 2011 is capable of receiving a first control signal and outputting a first switching signal to the relay switching unit 2012 when the first control signal is at a first level, and outputting a second switching signal to the relay switching unit 2012 when the first control signal is at a second level, the relay switching unit 2012 can efficiently control the first path to be conductive when it receives the first switching signal, and control the second path to be conductive when it receives the second switching signal.

[0075] Please continue to refer to Figure 3 In an exemplary embodiment, the relay control unit 2011 optionally includes a first subunit 2011a and a second subunit 2011b connected to each other, wherein the first subunit 2011a is used to receive the first control signal, and the second subunit 2011b is connected to the relay switching unit 2012.

[0076] Furthermore, the first subunit 2011a can be in the cut-off state when the first control signal is at the first level, and control the second subunit 2011b to be in the cut-off state. Then, when the second subunit 2011b is in the cut-off state, the second subunit 2011b will output the first switching signal to the relay switching unit 2012.

[0077] When the first control signal is at the second level, the first subunit 2011a can be in the on state and control the second subunit 2011b to be in the on state. Furthermore, when the second subunit 2011b is in the on state, the second subunit 2011b outputs the second switching signal to the relay switching unit 2012.

[0078] That is, the first subunit 2011a is in an off state when receiving a first electrical level, and is in an on state when receiving a second electrical level. The second subunit 2011b can follow the state of the first subunit 2011a. Furthermore, when the second subunit 2011b is off, it outputs a first switching signal to the relay switching unit 2012, and when the second subunit 2011b is on, it outputs a second switching signal to the relay switching unit 2012. For example, both the first subunit 2011a and the second subunit 2011b can be transistors.

[0079] In the above embodiment, the relay control unit 2011 includes a first subunit 2011a and a second subunit 2011b connected to each other; the first subunit 2011a is configured to receive a first control signal, and the second subunit 2011b is connected to the relay switching unit 2012. Since the first subunit 2011a can be in an off-state when the first control signal is at a first level and control the second subunit 2011b to be in an off-state, causing the second subunit 2011b to output the first switching signal to the relay switching unit 2012, and can be in an on-state when the first control signal is at a second level and control the second subunit 2011b to be in an on-state, causing the second subunit 2011b to output the second switching signal to the relay switching unit 2012, the first subunit 2011a and the second subunit 2011b can cooperate to output the corresponding first switching signal or second switching signal based on the first control signal, so that the flyback circuit 100 can promptly switch to the second conversion unit 2022 for voltage conversion when the switching condition is met.

[0080] Figure 4 FIG. 2 is a second schematic diagram of a conversion circuit in one embodiment, as shown in FIG. Figure 4 As shown, in an exemplary embodiment, optionally, the first subunit 2011a includes a first transistor Q3, and the second subunit 2011b includes a second transistor Q4.

[0081] The base of the first transistor Q3 is used to receive the first control signal RLY_Drv, the collector of the first transistor Q3 is connected to the base of the second transistor Q4, and the emitter of the first transistor Q3 is grounded.

[0082] The base of the second transistor Q4 is also connected to the feedback winding 101 , the emitter of the second transistor Q4 is connected to the feedback winding 101 via the relay switching unit 2012 , and the collector of the second transistor Q4 is grounded.

[0083] Please continue to refer to Figure 4 If the first control signal RLY_Drv is at the first level, for example, the first control signal RLY_Drv is at a low level, the first transistor Q3 is in the off state, so that the second transistor Q4 is also in the off state. In this case, the first subunit 2011a outputs the first switching signal to the second subunit 2011b.

[0084] If the first control signal RLY_Drv is at the second level, for example, the first control signal RLY_Drv is at a high level, the first transistor Q3 is turned on, so that the second transistor Q4 is also turned on. In this case, the first subunit 2011a outputs the second switching signal to the second subunit 2011b.

[0085] In the above embodiment, the first subunit 2011a includes a first transistor Q3, and the second subunit 2011b includes a second transistor Q4. Since the base of the first transistor Q3 is used to receive the first control signal, the collector of the first transistor Q3 is connected to the base of the second transistor Q4, and the emitter of the first transistor Q3 is grounded; the base of the second transistor Q4 is also connected to the feedback winding 101, the emitter of the second transistor Q4 is connected to the feedback winding 101 via the relay switching unit 2012, and the collector of the second transistor Q4 is grounded, the relay control unit 2011 can accurately output the first switching signal to the relay switching unit 2012 when the first control signal is at a first level, and can accurately output the second switching signal to the relay switching unit 2012 when the first control signal is at a second level.

[0086] Please continue to refer to Figure 4 In an exemplary embodiment, optionally, the relay switching unit 2012 includes a relay RLY1, and the relay RLY1 includes a coil, a first contact (ie Figure 4 Pin 3 shown in FIG), the second contact (ie Figure 4 Pin 4 shown in the figure) and the third contact (i.e. Figure 4 Pin 5 shown in the figure).

[0087] Among them, the first end of the coil (that is, Figure 4 Pin 1 shown in FIG) is connected to the feedback winding 101, and the second end of the coil (i.e. Figure 4Pin 2 shown in FIG is connected to the relay control unit 2011. The first contact is connected to the feedback winding 101, the second contact is connected to the input end of the first conversion unit 2021, and the third contact is connected to the input end of the second conversion unit 2022.

[0088] Furthermore, the relay switching unit 2012 is used to control the feedback winding 101 to stop energizing the coil when receiving the first switching signal, and connect the first contact and the second contact to conduct the first path, so that the first conversion unit 2021 works and the second conversion unit 2022 does not work.

[0089] The relay switching unit 2012 is also used to control the feedback winding 101 to energize the coil when receiving the second switching signal, and connect the first contact and the third contact to switch to the second path to be conductive, so that the first conversion unit 2021 does not work and the second conversion unit 2022 works.

[0090] In the above embodiment, the relay switching unit 2012 includes a coil, a first contact, a second contact, and a third contact. The first end of the coil is connected to the feedback winding 101, and the second end of the coil is connected to the relay control unit 2011. The first contact is connected to the feedback winding 101, the second contact is connected to the input end of the first conversion unit 2021, and the third contact is connected to the input end of the second conversion unit 2022. Because the relay switching unit 2012 can control the feedback winding 101 to stop energizing the coil and connect the first and second contacts to conduct the first path upon receiving a first switching signal, and can control the feedback winding 101 to energize the coil and connect the first and third contacts to conduct the second path upon receiving a second switching signal, the relay switching unit 2012 can efficiently implement switching between the first conversion unit 2021 and the second conversion unit 2022 using the first control signal.

[0091] Figure 5 This is a second schematic diagram of a first control module in an embodiment, as shown in FIG. Figure 5 As shown, in an exemplary embodiment, optionally, the first control module 201 includes a first switch unit 2013, a second switch unit 2014, and a third switch unit 2015. The first switch unit 2013 is connected to the second switch unit 2014 and the third switch unit 2015, respectively. The second switch unit 2014 is connected to the feedback winding 101 and the first conversion unit 2021, respectively. The third switch unit 2015 is connected to the feedback winding 101 and the second conversion unit 2022, respectively. Optionally, the first switch unit 2013, the second switch unit 2014, and the third switch unit 2015 can all be implemented by at least one switching element.

[0092] Furthermore, the first switch unit 2013 is configured to receive a first control signal, and is in a cut-off state when the first control signal is at a first level, and is in a conducting state when the first control signal is at a second level.

[0093] The second switch unit 2014 is configured to be in the on state when the first switch unit 2013 is in the off state and control the first path to be on, and to be in the off state when the first switch unit 2013 is in the on state and control the first path to be off.

[0094] The third switch unit 2015 is configured to be in the off state when the first switch unit 2013 is in the off state and control the second path to be disconnected, and to be in the on state when the first switch unit 2013 is in the on state and control the second path to be connected.

[0095] In this way, the state of the first switch unit 2013 can be used to control the states of the second switch unit 2014 and the third switch unit 2015, so that the second switch unit 2014 is in the on state when the first switch unit 2013 is in the off state, and controls the first path to be conductive, and the first switch unit 2013 is in the off state when the first switch unit 2013 is in the on state, and controls the first path to be disconnected. The third switch unit 2015 is also in the off state when the first switch unit 2013 is in the off state, and controls the second path to be disconnected, and the first switch unit 2013 is in the on state when the first switch unit 2013 is in the on state, and controls the second path to be conductive. In this way, switching between the first conversion unit 2021 and the second conversion unit 2022 can also be achieved.

[0096] Figure 6 FIG3 is a third schematic diagram of a conversion circuit in one embodiment, as shown in FIG3. Figure 6 As shown, in an exemplary embodiment, optionally, the first switch unit 2013 includes a third transistor Q5, the second switch unit 2014 includes a fourth transistor Q6, and the third switch unit 2015 includes a fifth transistor Q7.

[0097] The gate of the third transistor Q5 is used to receive the first control signal RLY_Drv, the source of the third transistor Q5 is grounded, and the drain of the third transistor Q5 is connected to the base of the fourth transistor Q6 and the base of the fifth transistor Q7 respectively.

[0098] The emitter of the fourth transistor Q6 is grounded, the collector of the fourth transistor Q6 is connected to the first conversion unit 2021, and the base of the fourth transistor Q6 is also connected to the feedback winding 101. Optionally, the collector of the fourth transistor Q6 is connected to the enable pin of the first conversion unit 2021.

[0099] An emitter of the fifth transistor Q7 is connected to the feedback winding 101 , and a collector of the fifth transistor Q7 is connected to the second conversion unit 2022 .

[0100] Further optionally, the first control module 201 further includes a first unidirectional conducting unit and a second unidirectional conducting unit. Optionally, the first unidirectional conducting unit includes but is not limited to at least one diode, and the second unidirectional conducting unit includes but is not limited to at least one diode.

[0101] Figure 6 For example, the first unidirectional conductive unit includes a diode D3 and the second unidirectional conductive unit includes a diode D4. Figure 6 As shown, the anode of the first unidirectional conducting unit, that is, the anode of the diode D3, is connected to the base of the fourth transistor Q6, and the cathode of the first unidirectional conducting unit, that is, the cathode of the diode D3, is connected to the drain of the third transistor Q5. The anode of the second unidirectional conducting unit, that is, the anode of the diode D4, is connected to the base of the fifth transistor Q7, and the cathode of the second unidirectional conducting unit, that is, the cathode of the diode D4, is connected to the drain of the third transistor Q5.

[0102] Please continue to refer to Figure 6 If the first control signal RLY_Drv is at a low level, the third transistor Q5 is in the off state, so that the fifth transistor Q7 is in the off state and the fourth transistor Q6 is in the on state, so as to pull the enable (EN) pin of the first conversion unit 2021 to the ground. At this time, the first path is turned on and the second path is turned off.

[0103] If the first control signal RLY_Drv is at the second level, for example, the first control signal RLY_Drv is at a high level, the third transistor Q5 is turned on, so that the fifth transistor Q7 is turned on. At this time, the first path is disconnected and the second path is turned on.

[0104] In the above embodiment, the first switch unit 2013 includes a third transistor Q5, the second switch unit 2014 includes a fourth transistor Q6, and the third switch unit 2015 includes a fifth transistor Q7. Since the gate of the third transistor Q5 is used to receive the first control signal, the source of the third transistor Q5 is grounded, and the drain of the third transistor Q5 is connected to the bases of the fourth transistor Q6 and the fifth transistor Q7, respectively; the emitter of the fourth transistor Q6 is grounded, the collector of the fourth transistor Q6 is connected to the first conversion unit 2021, and the base of the fourth transistor Q6 is also connected to the feedback winding 101; the emitter of the fifth transistor Q7 is connected to the feedback winding 101, and the collector of the fifth transistor Q7 is connected to the second conversion unit 2022, the first conversion unit 2021 and the second conversion unit 2022 can be efficiently switched according to the first control signal via the third transistor Q5, the fourth transistor Q6, and the fifth transistor Q7. Furthermore, since the first control module 201 also includes a first unidirectional conduction unit and a second unidirectional conduction unit, the positive electrode of the first unidirectional conduction unit is connected to the base of the fourth transistor Q6, and the negative electrode of the first unidirectional conduction unit is connected to the drain of the third transistor Q5; the positive electrode of the second unidirectional conduction unit is connected to the base of the fifth transistor Q7, and the negative electrode of the second unidirectional conduction unit is connected to the drain of the third transistor Q5, therefore, the working reliability of the first control module 201 can be improved by the first unidirectional conduction unit and the second unidirectional conduction unit.

[0105] Figure 7 FIG4 is a fourth schematic diagram of a conversion circuit in one embodiment, as shown in FIG4. Figure 7 As shown, in an exemplary embodiment, optionally, the first control module 201 further includes a fourth switch unit, and the fourth switch unit includes a sixth transistor Q8.

[0106] The emitter of the sixth transistor Q8 is connected to the feedback winding 101 , the collector of the sixth transistor Q8 is connected to the first conversion unit 2021 , and the base of the sixth transistor Q8 is connected to the collector of the fourth transistor Q6 .

[0107] Please refer to Figure 7 If the first control signal is at a low level, the third transistor Q5 is in the off state, the fifth transistor Q7 is in the off state, the fourth transistor Q6 is in the on state, and the sixth transistor Q8 is also in the on state. The first path is turned on and the second path is turned off.

[0108] If the first control signal is high, the third transistor Q5 is on, the fifth transistor Q7 is on, the fourth transistor Q6 is off, and the sixth transistor Q8 is also off. The first path is disconnected and the second path is on.

[0109] In the above embodiment, the first control module 201 further includes a fourth switch unit, which includes a sixth transistor Q8. Since the emitter of the sixth transistor Q8 is connected to the feedback winding 101, the collector of the sixth transistor Q8 is connected to the first conversion unit 2021, and the base of the sixth transistor Q8 is connected to the collector of the fourth transistor Q6, the conduction of the first path or the second path can also be reliably controlled by the sixth transistor Q8.

[0110] In an exemplary embodiment, optionally, when the first control signal is at the second level, the startup time of the first element needs to be later than the conduction time of the relay control unit 2011 or the first switch unit 2013. For example, if the first element is a relay in an inverter circuit, the energizing time of the relay in the inverter circuit needs to be later than the conduction time of the relay control unit 2011 or the first switch unit 2013. In this way, the first element can be controlled to start after the second conversion unit 2022 is switched on, further improving the reliability of the energy storage power supply.

[0111] In an exemplary embodiment, please refer to Figures 4 to 7 Optionally, the conversion circuit 200 further includes at least one of the following:

[0112] (1) Resistor R7. The first end of resistor R7 is used to receive the first control signal RLY_Drv; the second end of resistor R7 is connected to the base of the first transistor Q3, or the second end of resistor R7 is connected to the gate of the third transistor Q5. (2) Resistor R8. The first end of resistor R8 is connected to the base of the first transistor Q3, or the first end of resistor R8 is connected to the gate of the third transistor Q5; the second end of resistor R8 is grounded. (3) Resistor R9. Resistor R9 is connected to the emitter of the second transistor Q4 and the second end of the coil, respectively. (4) Resistor R10. Resistor R10 is connected to the feedback winding 101 and the base of the second transistor Q4, respectively. (5) Resistor R11. Resistor R11 is connected to the collector of the first transistor Q3 and the base of the second transistor Q4, respectively. (6) Resistor R12. Resistor R12 is connected to the emitter of the fifth transistor Q7 and the base of the fifth transistor Q7, respectively. (7) Resistor R13. Resistor R13 is connected to the anode of diode D4 and the base of fifth transistor Q7, respectively. (8) Resistor R14. Resistor R14 is connected to the input terminal and the enable terminal of first conversion unit 2021, respectively. (9) Resistor R15. Resistor R15 is connected to the base of fourth transistor Q6 and the drain of third transistor Q5, respectively. (10) Resistor R16. One end of resistor R16 is connected to the base of fourth transistor Q6, and the other end of resistor R16 is grounded. (11) Resistor R17. Resistor R17 is connected to feedback winding 101 and the anode of diode D3, respectively. (12) Resistor R18. Resistor R18 is connected to the emitter and base of sixth transistor Q8, respectively. (13) Resistor R19. Resistor R19 is connected to the base of sixth transistor Q8 and the collector of fourth transistor Q6, respectively. (14) Capacitor C4. The first end of capacitor C4 is connected to the output end of the second conversion unit 2022, and the second end of capacitor C4 is grounded. (15) Capacitor C5. The first end of capacitor C5 is connected to the feedback winding 101, and the second end of capacitor C5 is grounded.

[0113] By using at least one of the resistors or capacitors, the stability and reliability of the conversion circuit 200 can be further improved.

[0114] Figure 8 FIG5 is a fifth schematic diagram of a conversion circuit in one embodiment, as shown in FIG. Figure 8 As shown, in an exemplary embodiment, optionally, the conversion circuit 200 further includes a second control module 203 connected to the first control module 201 .

[0115] The second control module 203 is configured to respond to a second control signal of the second element and control the first control module 201 to conduct the first path when the second control signal is used to instruct the second element to start.

[0116] Optionally, the feedback winding 101 is used to power a second component. That is, starting the second component causes the feedback voltage to drop, resulting in the power of the secondary winding 102 being no greater than the power of the feedback winding 101. Exemplarily, the second component includes but is not limited to the aforementioned fan.

[0117] The second control signal can be used to control the second element to start or stop working. The second control signal includes a third level or a fourth level. When the second control signal is at the third level, the second control signal is used to control the second element to stop working. When the second control signal is at the fourth level, the second control signal is used to control 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.

[0118] Optionally, the second control module 203 may include at least one switch element. Thus, when the second control module 203 receives the fourth electrical level, it may control the first path to be turned on through the switch element in the second control module 203 .

[0119] In the above embodiment, since the conversion circuit 200 also includes a second control module 203 connected to the first control module 201, and the first control module 201 is capable of responding to the second control signal of the second element, when the second control signal is used to indicate that the second element is started, the first control module 201 is controlled to turn on the first path. In this way, when the feedback voltage may drop due to the start of the second element, it is possible to switch back to the first conversion unit 2021 with high conversion efficiency in time, so that the energy coupling between the feedback winding 101 and the secondary winding 102 is balanced.

[0120] In order to more clearly introduce the conversion circuit 200 of the present application, the following description will be made in conjunction with the working process of the energy storage power supply.

[0121] Please refer to Figure 4 During operation process 1, the relay in the inverter circuit is not activated, the first control signal RLY_Drv is at a low level, the first transistor Q3 is in the off state, the base and emitter of the second transistor Q4 are at the same potential, and the second transistor Q4 is also in the off state. The coil of relay RLY1 has no current loop, and relay RLY1 does not operate. Relay RLY1 maintains pins 3 and 4 connected, the first path is conductive, and the feedback voltage of feedback winding 12V_P is converted to a preset voltage of 5V by first conversion unit 2021. At this point, the power of feedback winding 12V_P is relatively balanced with the power of secondary winding 12V_S, and the secondary voltage does not change significantly, which does not affect normal operation.

[0122] In working process 2, the relay in the inverter circuit needs to be started, the first control signal RLY_Drv is at a high level, the first transistor Q3 is in the on state, the resistors R11 and R10 divide the feedback voltage of the feedback winding 12V_P, the base potential of the second transistor Q4 is lower than the emitter potential, and the second transistor Q4 is also in the on state. The coil of the relay RLY1 forms a current loop under the power supply of the feedback winding 12V_P, the relay RLY1 works, and the relay RLY1 is switched from being connected between pins 3 and 4 to being connected between pins 3 and 5. The second path is turned on, and the feedback voltage of the feedback winding 12V_P is converted into a preset voltage of 5V by the second conversion unit 2022. If relay RLY1 operates at 1.5W, the power of feedback winding 12V_P on the display and control chip is approximately 2.5W. The total power of feedback winding 12V_P is 5W, and the total power of secondary winding 12V_S is 2W. The power of feedback winding 12V_P is significantly greater than that of secondary winding 12V_S, so the voltage of secondary winding 12V_S will rise, but this will not affect normal operation. It should be noted that to improve reliability, the withstand voltage of devices powered by the secondary winding 12V_S voltage must be greater than the voltage after the secondary winding 12V_S voltage rises.

[0123] In addition, the first control signal RLY_Drv is a signal for controlling the energization of the relay of the inverter circuit and a signal for controlling the conduction of the first transistor Q3. Since a certain amount of time is required for the relay RLY1 to switch, in order to avoid the relay of the inverter circuit being energized before the relay RLY1 completes switching, thereby causing the voltage of the secondary winding 12V_S to drop, thereby causing the relay of the inverter circuit to fail to be energized, therefore, the energization time of the relay of the inverter circuit controlled by the first control signal RLY_Drv needs to be delayed than the conduction time of the first transistor Q3.

[0124] After the delay, the relay of the inverter circuit is energized. At this time, the total power of the secondary winding 12V_S increases to 5W, and the total power of the feedback winding 12V_P remains at 5W. In this way, the conversion loss of the second conversion unit 2022 can make the energy coupling on both sides relatively balanced.

[0125] Furthermore, the relay of the inverter circuit is closed, the energy storage power supply operates normally, and the voltage of the secondary winding 12V_S returns to the original voltage.

[0126] Please refer to Figure 6 ,and Figure 4The control principle is similar to that of FIG. In operation process 1, the first control signal RLY_Drv is at a low level, the third transistor Q5 is in the off state, and the base and emitter of the fifth transistor Q7 are at the same potential, and the fifth transistor Q7 is in the off state. Furthermore, at this time, the base of the fourth transistor Q6 is at a high level, and the fourth transistor Q6 is in the on state, pulling the enable pin EN of the first conversion unit 2021 to ground, turning on the first path and disconnecting the second path.

[0127] In working process 2, the first control signal RLY_Drv is at a high level, the third transistor Q5 is in the on state, the resistor R7 and the resistor R10 divide the feedback voltage of the feedback winding 12V_P, the base potential of the fifth transistor Q7 is lower than the emitter potential, the fifth transistor Q7 is in the off state, the base of the fourth transistor Q6 is at a low level, the fourth transistor Q6 is in the on state, the enable pin of the first conversion unit 2021 is at a high level, the first path is disconnected, and the second path is on.

[0128] Similarly, the first control signal RLY_Drv controls the closing time of the relay in the inverter circuit to be delayed before the turn-on time of the third transistor Q5.

[0129] Please refer to Figure 7 ,and Figure 6 The control principle is similar to that of FIG. In operation process 1, the first control signal RLY_Drv is at a low level, the third transistor Q5 is in the off state, and the base and emitter of the fifth transistor Q7 are at the same potential, so the fifth transistor Q7 is in the off state. Furthermore, at this time, the base of the fourth transistor Q6 is at a high level, and the fourth transistor Q6 is in the on state, which in turn raises the base potential of the sixth transistor Q8, causing the sixth transistor Q8 to also be in the on state. The first path is turned on, and the second path is turned off.

[0130] In working process 2, the first control signal RLY_Drv is at a high level, the third transistor Q5 is in the on state, the resistors R7 and R10 divide the feedback voltage of the feedback winding 12V_P, the base potential of the fifth transistor Q7 is lower than the emitter potential, and the fifth transistor Q7 is also in the on state, while the base of the fourth transistor Q6 is at a low level, and the fourth transistor Q6 is in the off state, so the sixth transistor Q8 is also in the off state, the first path is disconnected, and the second path is connected.

[0131] Similarly, the first control signal RLY_Drv controls the closing time of the relay in the inverter circuit to be delayed before the turn-on time of the third transistor Q5.

[0132] Thus, during no-load operation or the initial stages of charging or discharging, the display and control chip are powered by the 12V_P voltage, converted to a preset voltage by the first conversion unit, to maintain low-power operation and reduce battery consumption. When the inverter circuit's relay needs to be closed, it is powered by the preset voltage converted by the second conversion unit. The conversion loss of the second conversion unit is used to increase the load on the feedback winding 12V_P, thereby raising the secondary voltage of the secondary winding 12V_S. This ensures that when the inverter circuit's relay is closed, sufficient energy is available on the feedback winding 12V_P to prevent the voltage on the secondary winding 12V_S from dropping below the relay's minimum closing voltage, thereby completing closing and ensuring normal operation of the energy storage power supply. When charging or discharging power increases and the fan begins to rotate, the first conversion unit is switched back to operation, maintaining low-power operation, reducing battery consumption, and extending the operating time of the energy storage power supply.

[0133] It can be seen that the conversion circuit of this embodiment switches the voltage conversion module only when the relay of the inverter circuit needs to be energized, thereby increasing the load on the feedback winding 12V_P to ensure that the relay of the inverter circuit is fully energized and the energy storage power supply operates normally. The conversion circuit maintains low power consumption at other times. In addition, no additional control signal is required, and multiplexing can be achieved by referencing the control signal of the related flyback circuit.

[0134] Figure 9 FIG. 1 is a schematic diagram of an energy storage power supply in one embodiment, as shown in FIG. Figure 9 As 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 conversion circuits 200.

[0135] 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.

[0136] 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.

[0137] 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 conversion circuit applied to a flyback circuit, characterized in that: The conversion circuit includes a first control module and a voltage conversion module, the first control module is connected to the voltage conversion module and the feedback winding of the flyback circuit respectively, the voltage conversion module includes a first conversion unit and a second conversion unit, and the conversion efficiency of the second conversion unit is lower than the conversion efficiency of the first conversion unit; The first control module is configured to control a first path between the feedback winding and the first conversion unit to be conductive if the flyback circuit does not meet a switching condition, and to control a second path between the feedback winding and the second conversion unit to be conductive if the flyback circuit meets a switching condition; the switching condition includes that the power of the secondary winding of the flyback circuit is greater than the power of the feedback winding, and the difference between the power of the secondary winding and the power of the feedback winding is greater than a preset difference; The voltage conversion module is configured to convert the feedback voltage of the feedback winding into a preset voltage through the first conversion unit or the second conversion unit.

2. The conversion circuit according to claim 1, characterized in that: The first control module is further configured to receive a first control signal of a first component, and when the first control signal is at a first level for controlling the first component to stop working, determine that the flyback circuit does not meet the switching condition, so as to control the first path to be turned on; and when the first control signal is at a second level for controlling the activation of the first element, determining that the flyback circuit satisfies the switching condition, so as to control the second path to be turned on; The secondary winding is used to supply power to the first element.

3. The conversion circuit according to claim 2, characterized in that: The first control module includes a relay control unit and a relay switching unit, the relay switching unit is respectively connected to the relay control unit, the input end of the voltage conversion module and the feedback winding of the flyback circuit, and the relay control unit is also connected to the feedback winding; the relay control unit being configured to receive the first control signal, output a first switching signal to the relay switching unit when the first control signal is at the first level, and output a second switching signal to the relay switching unit when the first control signal is at the second level; The relay switching unit is configured to control the first path to be conductive when the first switching signal is received, and to control the second path to be conductive when the second switching signal is received.

4. The conversion circuit according to claim 3, characterized in that: The relay control unit includes a first subunit and a second subunit connected to each other; the first subunit is used to receive the first control signal, and the second subunit is connected to the relay switching unit; The first subunit is configured to be in an off state when the first control signal is at the first level, and control the second subunit to be in an off state so that the second subunit outputs the first switching signal to the relay switching unit; and to be in an on state when the first control signal is at the second level, and control the second subunit to be in an on state so that the second subunit outputs the second switching signal to the relay switching unit.

5. The conversion circuit according to claim 4, characterized in that: The first sub-unit includes a first transistor, and the second sub-unit includes a second transistor; The base of the first transistor is used to receive the first control signal, the collector of the first transistor is connected to the base of the second transistor, and the emitter of the first transistor is grounded; The base of the second transistor is also connected to the feedback winding, the emitter of the second transistor is connected to the feedback winding via the relay switching unit, and the collector of the second transistor is grounded.

6. The conversion circuit according to any one of claims 3 to 5, characterized in that: The relay switching unit includes a coil, a first contact, a second contact, and a third contact; the first end of the coil is connected to the feedback winding, and the second end of the coil is connected to the relay control unit; the first contact is connected to the feedback winding, the second contact is connected to the input end of the first conversion unit, and the third contact is connected to the input end of the second conversion unit; The relay switching unit is configured to control the feedback winding to stop energizing the coil and connect the first contact and the second contact to conduct the first path upon receiving the first switching signal; and to control the feedback winding to energize the coil and connect the first contact and the third contact to switch to conducting the second path upon receiving the second switching signal.

7. The conversion circuit according to claim 2, characterized in that: The first control module includes a first switch unit, a second switch unit, and a third switch unit; the first switch unit is connected to the second switch unit and the third switch unit respectively, the second switch unit is connected to the feedback winding and the first conversion unit respectively, and the third switch unit is connected to the feedback winding and the second conversion unit respectively; The first switch unit is configured to receive the first control signal, and is in an off state when the first control signal is at the first level, and is in an on state when the first control signal is at the second level; The second switch unit is configured to be in an on state when the first switch unit is in an off state and control the first path to be on, and to be in an off state when the first switch unit is in an on state and control the first path to be off; The third switch unit is configured to be in an off state when the first switch unit is in an off state and control the second path to be disconnected, and to be in an on state when the first switch unit is in an on state and control the second path to be turned on.

8. The conversion circuit according to claim 7, characterized in that: The first switch unit includes a third transistor, the second switch unit includes a fourth transistor, and the third switch unit includes a fifth transistor; The gate of the third transistor is used to receive the first control signal, the source of the third transistor is grounded, and the drain of the third transistor is connected to the base of the fourth transistor and the base of the fifth transistor respectively; The emitter of the fourth transistor is grounded, the collector of the fourth transistor is connected to the first conversion unit, and the base of the fourth transistor is also connected to the feedback winding; An emitter of the fifth transistor is connected to the feedback winding, and a collector of the fifth transistor is connected to the second conversion unit.

9. The conversion circuit according to claim 8, characterized in that: The first control module further includes a first one-way conducting unit and a second one-way conducting unit; The positive electrode of the first unidirectional conductive unit is connected to the base of the fourth transistor, and the negative electrode of the first unidirectional conductive unit is connected to the drain of the third transistor; An anode of the second unidirectional conductive unit is connected to the base of the fifth transistor, and a cathode of the second unidirectional conductive unit is connected to the drain of the third transistor.

10. The conversion circuit according to claim 9, characterized in that: The first control module further includes a fourth switch unit, and the fourth switch unit includes a sixth transistor; An emitter of the sixth transistor is connected to the feedback winding, a collector of the sixth transistor is connected to the first conversion unit, and a base of the sixth transistor is connected to the collector of the fourth transistor.

11. The conversion circuit according to any one of claims 1 to 5, characterized in that: The conversion circuit further includes a second control module; the second control module is connected to the first control module; The second control module is configured to respond to a second control signal of a second element and control the first control module to conduct the first path when the second control signal is used to instruct the second element to start.

12. An energy storage power supply, characterized in that: The energy storage power supply includes a flyback circuit and a conversion circuit according to any one of claims 1 to 11.

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