Conversion circuit applied to flyback circuit and energy storage power supply

Abstract

The invention relates to a conversion circuit applied to a flyback circuit and an energy storage power supply. The conversion circuit comprises a first control module and a voltage conversion module, the voltage conversion module comprises a first conversion unit and a second conversion unit, and the conversion efficiency of the second conversion unit is smaller than that of the first conversion unit. The first control module is used for controlling a first path between the feedback winding and the first conversion unit to be conducted under the condition that the flyback circuit does not meet the switching condition, and controlling a second path between the feedback winding and the second conversion unit to be conducted under the condition that the flyback circuit meets the switching condition; and the voltage conversion module is used for converting the feedback voltage of the feedback winding into a preset voltage through the first conversion unit or the second conversion unit. The switching condition comprises that the power of the secondary winding of the flyback circuit is greater than the power of the feedback winding, and the difference value between the power of the secondary winding and the power of the feedback winding is greater than a preset difference value. The conversion circuit can improve the reliability of the energy storage power supply.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, 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 widely used in various scenarios. The auxiliary power supply of an energy storage power supply is an important part of the energy storage power supply, which powers components such as fans, relays of inverter circuits, switch tube drivers, current transformers (CTs), display screens, and control chips in the energy storage power supply.

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

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

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

[0006] In a first aspect, the present application provides a conversion circuit applied to a flyback circuit, including 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, and the conversion efficiency of the second conversion unit is less than that of the first conversion unit;

[0007] The first control module is configured to control the first path between the feedback winding and the first conversion unit to conduct when the flyback circuit does not meet the switching condition, and control the second path between the feedback winding and the second conversion unit to conduct when the flyback circuit meets the 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;

[0008] 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.

[0009] In one embodiment, the first control module is further configured to receive a first control signal of a first component, and when the first control signal is 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 conduct; and when the first control signal is a second level for controlling the first component to start, determine that the flyback circuit meets the switching condition, so as to control the second path to conduct;

[0010] Wherein, the secondary winding is used to supply power to the first component.

[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. The relay control unit is also connected to the feedback winding;

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

[0013] The relay switching unit is configured to control the first path to conduct when receiving the first switching signal, and control the second path to conduct when receiving the second switching signal.

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

[0015] The first sub-unit is configured to be in a cut-off state when the first control signal is the first level, and control the second sub-unit to be in a cut-off state, so that the second sub-unit outputs the first switching signal to the relay switching unit, and be in a conducting state when the first control signal is the second level, and control the second sub-unit to be in a conducting state, so that the second sub-unit outputs the second switching signal to the relay switching unit.

[0016] In one embodiment, the first sub-unit includes a first transistor, and the second sub-unit includes a second transistor;

[0017] The base of the first transistor is configured 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; a first end of the coil is connected to the feedback winding, and a 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 configured to control the feedback winding to stop powering 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 power the coil and connect the first contact and the third contact to switch to the second path to conduct 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 respectively connected to the second switch unit and the third switch unit, the second switch unit is respectively connected to the feedback winding and the first conversion unit, and the third switch unit is respectively connected to the feedback winding and the second conversion unit;

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

[0023] The second switch unit is configured to be in a conducting state when the first switch unit is in a cut-off state and control the first path to conduct, and be in a cut-off state when the first switch unit is in a conducting state and control the first path to disconnect;

[0024] The third switch unit is configured to be in a cut-off state when the first switch unit is in a cut-off state and control the second path to disconnect, and be in a conducting state when the first switch unit is in a conducting state and control the second path to conduct.

[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 configured to receive the first control signal, the source of the third transistor is grounded, and the drain of the third transistor is respectively connected to the bases of the fourth transistor and the fifth transistor;

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

[0029] In one embodiment, the first control module further includes a first unidirectional conduction unit and a second unidirectional conduction unit;

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

[0031] The positive electrode of the second unidirectional conduction unit is connected to the base of the fifth transistor, and the negative electrode of the second unidirectional conduction unit is connected to the drain of the third transistor.

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

[0033] The emitter of the sixth transistor is connected to the feedback winding, the collector of the sixth transistor is connected to the first conversion unit, and the 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 the second control signal of the second element and control the first control module to turn on the first path when the second control signal is used to indicate the start of the second element.

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

[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 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. Since the first control module can control the conduction of the first path between the feedback winding and the first conversion unit when the flyback circuit does not meet the switching condition, and control the conduction of the second path between the feedback winding and the second conversion unit when the flyback circuit meets the switching condition, so that the voltage conversion module can convert 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 less than that of the first conversion unit. Therefore, when the start of the first component causes the secondary voltage to drop, resulting in the power of the secondary winding being much greater than the power of the feedback winding, that is, the feedback winding is lightly loaded and the secondary winding is heavily loaded, the second conversion unit with low conversion efficiency can increase the load of the feedback winding, balance the power between the feedback winding and the secondary winding, avoid the situation of the energy storage power supply failing to operate due to the start of the first component, make the energy storage power supply operate more stably, and improve the reliability of the energy storage power supply. 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 will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic diagram of a flyback circuit in related technologies;

[0040] Figure 2 It is one of the schematic diagrams of a conversion circuit in an embodiment;

[0041] Figure 3 It is one of the schematic diagrams of a first control module in an embodiment;

[0042] Figure 4 It is another schematic diagram of a conversion circuit in an embodiment;

[0043] Figure 5 It is another schematic diagram of a first control module in an embodiment;

[0044] Figure 6 It is yet another schematic diagram of a conversion circuit in an embodiment;

[0045] Figure 7 It is the fourth schematic diagram of a conversion circuit in an embodiment;

[0046] Figure 8 It is the fifth schematic diagram of a conversion circuit in an embodiment;

[0047] Figure 9 It is the schematic diagram of an energy storage power supply in an embodiment. Detailed implementation manners

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] Figure 1 It is the schematic diagram of a flyback circuit in the related art. As Figure 1 shown, the flyback circuit 100 includes a battery voltage BAT+, a feedback winding 101 (i.e., Figure 1 12V_P in Figure 1 ), a diode D1, a resistor R1, a capacitor C1, a transformer T1, a resistor R2, a diode D2, a secondary winding 102 (i.e.,

[0050] 12V_S in

[0051] ), a capacitor C2, a transistor Q1, a resistor R3, a resistor R4, a control integrated circuit (Control Integrated Circuit, Control IC) 103, a capacitor C3, a resistor R5, a resistor R6 and a transistor Q2. Among them, the input (IN) pin of the control integrated circuit 103 is connected to the battery voltage BAT+, the feedback (FB) pin of the control integrated circuit 103 is connected to the collector of the transistor Q2, and the gate drive (GATE) pin of the control integrated circuit 103 is connected to the gate of the transistor Q1 through the resistor R3. GND and GND1 represent different ground terminals.

[0050] Among them, the feedback winding 12V_P can supply power to the fan, low-voltage side switch tube drive, display screen and control chip in the energy storage power supply, and the secondary winding 12V_S can supply power to the relay, high-voltage side switch tube drive, and CT in the inverter circuit. Specifically, the display screen and the control chip can be powered by the feedback winding 12V_P after being converted to a 5-volt (V) voltage through a buck module. Exemplarily, the power of the fan is about 3 watts (W); the power of the low-voltage side switch tube drive is about 1W; the power of the display screen and the control chip is about 1W; the power of the relay in the inverter circuit is about 3W; the power of the CT is about 1W; the power of the high-voltage side switch tube drive is about 1W.

[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 is driven, the high-voltage side switch tube is driven, the CT, the display screen and the control chip start to work; Working process 2, the relay of the inverter circuit is closed; Working process 3: After the charging or discharging power of the energy storage power supply is stable, the fan starts to work.

[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 is relatively balanced with the power of the secondary winding 12V_S. That is, the energy coupling between the feedback winding and the secondary winding is balanced, and the secondary voltage of the secondary winding 12V_S does not change, which does not affect the normal operation of the energy storage power supply.

[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 larger than the power of the feedback winding 12V_P. Then the secondary voltage of the secondary winding 12V_S will drop, and may even drop below the minimum pull-in voltage of the relay, resulting in the failure of the relay of the inverter circuit to pull in, and causing the charging or discharging of the energy storage power supply to fail.

[0054] It can be seen that due to the cross regulation rate of the flyback circuit, if the energy coupling between the feedback winding and the secondary winding is unbalanced, resulting in a drop in the secondary voltage and the failure of the energy storage power supply to operate, the reliability of the energy storage power supply is affected. Based on this, the present application provides a conversion circuit applied to the flyback circuit, which will be introduced below.

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

[0056] Moreover, the conversion efficiency of the second conversion unit 2022 is less than that of the first conversion unit 2021. That is to say, the ratio of the output power to the input power of the second conversion unit 2022 is less 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 circuit, a linear voltage regulator module, a traditional transformer, a load device with a small resistance value, etc. The second conversion unit 2022 includes, but is not limited to, a low dropout regulator (LDO), a direct current - direct current (DC - DC) conversion module, a load device with a high resistance value. The DC - DC conversion module can be an LLC, a buck converter, a boost converter, a buck - boost converter, a forward converter, or a push - pull converter. Taking the first conversion unit 2021 as a buck circuit and the second conversion unit 2022 as an LDO as an example, the conversion efficiency of the buck circuit is about 96%, and the conversion efficiency of the LDO is about 50%.

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

[0059] Among them, 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, which can be set according to requirements.

[0060] Optionally, the first control module 201 may include at least one switching element. In this way, when the flyback circuit 100 does not meet the switching condition, the first path can be turned on through the switching element in the first control module 201, and when the flyback circuit 100 meets the switching condition, the second path can be turned on through the switching element in the first control module 201. Among them, 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). Exemplarily, the switching element in the first control module can be a single - pole double - throw switch.

[0061] Further optionally, the first control module 201 can obtain the power of the secondary winding 102 and the power of the feedback winding 101 of the flyback circuit 100 through sensors 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 the switching element in the first control module through the control element in the first control module, so as to realize the conduction of the first path or the second path. Among them, the control element includes but is not limited to a Central Processing Unit (CPU), a Digital Signal Processing (DSP), a Field-Programmable Gate Array (FPGA), or other programmable logic devices.

[0063] Furthermore, the voltage conversion module 202 is used to convert the feedback voltage of the feedback winding 101 into a preset voltage through 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 works and the second conversion unit 2022 does not work, and the voltage conversion module 202 converts the feedback voltage of the feedback winding 101 into a preset voltage through the first conversion unit 2021; when the flyback circuit 100 meets the switching condition, the first conversion unit 2021 does not work and the second conversion unit 2022 works, and the voltage conversion module 202 converts the feedback voltage of the feedback winding 101 into a preset voltage through the second conversion unit 2022. The preset voltage is set according to requirements, for example, 5V.

[0064] In the above-mentioned conversion circuit 200, the first control module 201 is respectively connected to the voltage conversion module 202 and the feedback winding 101 of the flyback circuit 100. The voltage conversion module 202 includes a first conversion unit 2021 and a second conversion unit 2022. 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. Since the first control module 201 can control the first path between the feedback winding 101 and the first conversion unit 2021 to conduct when the flyback circuit 100 does not meet the switching condition, and control the second path between the feedback winding 101 and the second conversion unit 2022 to conduct when the flyback circuit 100 meets the switching condition, so that the voltage conversion module 202 can convert the feedback voltage of the feedback winding 101 into a preset voltage through the first conversion unit 2021 or the second conversion unit 2022. Moreover, the conversion efficiency of the second conversion unit 2022 is less than that of the first conversion unit 2021. Therefore, when the start of the first component 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, the feedback winding 101 is lightly loaded and the secondary winding 102 is heavily loaded, the second conversion unit 2022 with low conversion efficiency can increase the load of the feedback winding 101, balance the power between the feedback winding 101 and the secondary winding 102, avoid the situation that the energy storage power supply fails to operate due to the start of the first component, enable the energy storage power supply to operate more stably, and improve the reliability of the energy storage power supply.

[0065] In an exemplary embodiment, optionally, the first control module 201 is further configured to receive a first control signal of the first component. Wherein, the secondary winding 102 is used to supply power to the first component. That is to say, the start of the first component will cause 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, so that the energy coupling between the feedback winding and the secondary winding is unbalanced. Exemplarily, the first component includes but is not limited to the relay in the above-mentioned inverter circuit.

[0066] The first control signal is used to control the start or stop of the first component. Wherein, the first control signal includes a first level or a second level. When the first control signal is the first level, the first control signal is used to control the first component to stop working. When the first control signal is the second level, the first control signal is used to control the first component to start. The first level and the second level can be set according to requirements. Exemplarily, the first level can be a low level and the second level can be a high level.

[0067] Furthermore, when the first control signal is at the 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 conduct; when the first control signal is at the second level, the first control module 201 determines that the flyback circuit 100 meets the switching condition and controls the second path to conduct.

[0068] In the above embodiment, since the first control module 201 is further configured to receive the first control signal of the first component, and the secondary winding 102 is used to supply power to the first component, the first control signal can reflect the startup situation of the first component. Further, since the first control module 201 can determine that the flyback circuit 100 does not meet the switching condition to control the first path to conduct when the first control signal is at the first level for controlling the first component to stop working; and can determine that the flyback circuit 100 meets the switching condition to control the second path to conduct when the first control signal is at the second level for controlling the first component to start up. In this way, based on the first control signal, the voltage conversion module 202 can be flexibly and efficiently controlled to perform voltage conversion under the condition of energy balance between the feedback winding 101 and the secondary winding 102.

[0069] Figure 3 FIG. 7 is one of the schematic diagrams of a first control module in an embodiment. In an exemplary embodiment, optionally, 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.

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

[0071] It can be 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 with different levels. For example, the first switching signal is a high level and the second switching signal is a low level. Of course, it can also be that the first switching signal is 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. This embodiment is not limited thereto.

[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 the cut-off state when receiving the first level, and the switching element in the relay control unit 2011 is in the conducting state when receiving the second level.

[0073] Furthermore, the relay switching unit 2012 controls the first path to conduct when receiving the first switching signal, and controls the second path to conduct when receiving the 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 conducts the first path after receiving the first switching signal, and the switching element in the relay switching unit 2012 conducts the second path after receiving the second switching signal. Further optionally, the relay switching unit 2012 controls the first path to conduct when the relay control unit 2011 is in the cut-off state, and controls the second path to conduct when the relay control unit 2011 is in the conducting 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. Since the relay control unit 2011 can receive the first control signal, output the first switching signal to the relay switching unit 2012 when the first control signal is the first level, and output the second switching signal to the relay switching unit 2012 when the first control signal is the second level, therefore, the relay switching unit 2012 can efficiently control the first path to conduct when receiving the first switching signal, and control the second path to conduct when receiving the second switching signal.

[0075] Please continue to refer to Figure 3 , in an exemplary embodiment, optionally, the relay control unit 2011 includes a first sub-unit 2011a and a second sub-unit 2011b that are connected to each other. Among them, the first sub-unit 2011a is used to receive the first control signal, and the second sub-unit 2011b is connected to the relay switching unit 2012.

[0076] Furthermore, the first sub-unit 2011a can be in the cut-off state when the first control signal is the first level, and control the second sub-unit 2011b to be in the cut-off state. Further, when the second sub-unit 2011b is in the cut-off state, the second sub-unit 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 sub-unit 2011a can be in a conducting state and control the second sub-unit 2011b to be in a conducting state. Furthermore, when the second sub-unit 2011b is in a conducting state, the second sub-unit 2011b outputs a second switching signal to the relay switching unit 2012.

[0078] That is to say, the first sub-unit 2011a is in a cut-off state when receiving the first level and in a conducting state when receiving the second level. The second sub-unit 2011b can follow the state of the first sub-unit 2011a. Furthermore, when the second sub-unit 2011b is cut off, it outputs a first switching signal to the relay switching unit 2012, and when the second sub-unit 2011b is conducting, it outputs a second switching signal to the relay switching unit 2012. Exemplarily, both the first sub-unit 2011a and the second sub-unit 2011b can be triodes.

[0079] In the above embodiment, the relay control unit 2011 includes a first sub-unit 2011a and a second sub-unit 2011b connected to each other; the first sub-unit 2011a is used to receive the first control signal, and the second sub-unit 2011b is connected to the relay switching unit 2012. Since the first sub-unit 2011a can be in a cut-off state when the first control signal is at the first level and control the second sub-unit 2011b to be in a cut-off state, so that the second sub-unit 2011b outputs a first switching signal to the relay switching unit 2012, and when the first control signal is at the second level, it is in a conducting state and controls the second sub-unit 2011b to be in a conducting state, so that the second sub-unit 2011b outputs a second switching signal to the relay switching unit 2012. Therefore, through the cooperation of the first sub-unit 2011a and the second sub-unit 2011b, the corresponding first switching signal or second switching signal can be output based on the first control signal, so as to switch to the second conversion unit 2022 for voltage conversion in time when the flyback circuit 100 meets the switching condition.

[0080] Figure 4 Schematic diagram II of a conversion circuit in an embodiment, as Figure 4 shown, in an exemplary embodiment, optionally, the first sub-unit 2011a includes a first transistor Q3, and the second sub-unit 2011b includes a second transistor Q4.

[0081] Wherein, 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 through 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, then the first transistor Q3 is in the cut-off state, making the second transistor Q4 also in the cut-off state. In this case, the first sub-unit 2011a outputs the first switching signal to the second sub-unit 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, then the first transistor Q3 is in the conducting state, making the second transistor Q4 also in the conducting state. In this case, the first sub-unit 2011a outputs the second switching signal to the second sub-unit 2011b.

[0085] In the above embodiment, the first sub-unit 2011a includes the first transistor Q3, and the second sub-unit 2011b includes the 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 through the relay switching unit 2012, and the collector of the second transistor Q4 is grounded. Therefore, 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 the first level, and output the second switching signal to the relay switching unit 2012 when the first control signal is at the second level.

[0086] Please continue to refer to Figure 4 , in an exemplary embodiment, optionally, the relay switching unit 2012 includes a relay RLY1. The relay RLY1 includes a coil, a first contact (i.e., Figure 4 the pin 3 shown in Figure 4 ), a second contact (i.e., Figure 4 the pin 4 shown in

[0087] ), and a third contact (i.e., Figure 4 the pin 5 shown in Figure 4The pin shown in 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 terminal of the first conversion unit 2021, and the third contact is connected to the input terminal of the second conversion unit 2022.

[0088] Furthermore, the relay switching unit 2012 is configured to control the feedback winding 101 to stop energizing the coil upon 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 operates and the second conversion unit 2022 does not operate.

[0089] The relay switching unit 2012 is further configured to control the feedback winding 101 to energize the coil upon receiving the second switching signal, and connect the first contact and the third contact to switch to the conduction of the second path, so that the first conversion unit 2021 does not operate and the second conversion unit 2022 operates.

[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 terminal of the first conversion unit 2021, and the third contact is connected to the input terminal of the second conversion unit 2022. Since the relay switching unit 2012 can control the feedback winding 101 to stop energizing the coil upon receiving the first switching signal, and connect the first contact and the second contact to conduct the first path; and control the feedback winding 101 to energize the coil upon receiving the second switching signal, and connect the first contact and the third contact to switch to the conduction of the second path, therefore, the relay switching unit 2012 can efficiently implement the switching between the first conversion unit 2021 and the second conversion unit 2022 by using the first control signal.

[0091] Figure 5 For a second schematic diagram of a first control module in an embodiment, as Figure 5 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. Among them, the first switch unit 2013 is respectively connected to the second switch unit 2014 and the third switch unit 2015, the second switch unit 2014 is respectively connected to the feedback winding 101 and the first conversion unit 2021, and the third switch unit 2015 is respectively connected to the feedback winding 101 and the second conversion unit 2022. 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] Further, the first switching unit 2013 is configured to receive a first control signal, 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.

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

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

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

[0096] Figure 6 FIG. 3 is a schematic diagram of a conversion circuit in an embodiment. As Figure 6 shown, in an exemplary embodiment, optionally, the first switching unit 2013 includes a third transistor Q5, the second switching unit 2014 includes a fourth transistor Q6, and the third switching unit 2015 includes a fifth transistor Q7.

[0097] Wherein, the gate of the third transistor Q5 is configured 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 respectively connected to the base of the fourth transistor Q6 and the base of the fifth transistor Q7.

[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] 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.

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

[0101] Figure 6 Taking the first unidirectional conduction unit including diode D3 and the second unidirectional conduction unit including diode D4 as an example, as Figure 6 shown, the positive electrode of the first unidirectional conduction unit, that is, the positive electrode of diode D3, is connected to the base of the fourth transistor Q6, and the negative electrode of the first unidirectional conduction unit, that is, the negative electrode of diode D3, is connected to the drain of the third transistor Q5. The positive electrode of the second unidirectional conduction unit, that is, the positive electrode of diode D4, is connected to the base of the fifth transistor Q7, and the negative electrode of the second unidirectional conduction unit, that is, the negative electrode of 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 a cut-off state, so that the fifth transistor Q7 is in a cut-off state and the fourth transistor Q6 is in a conducting state to pull the enable (EN) pin of the first conversion unit 2021 to the ground. At this time, the first path is conducting and the second path is disconnected.

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

[0104] In the above embodiments, 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 base of the fourth transistor Q6 and the base of 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. Therefore, through the third transistor Q5, the fourth transistor Q6, and the fifth transistor Q7, the first conversion unit 2021 and the second conversion unit 2022 can be efficiently switched according to the first control signal. Further, since the first control module 201 further 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 through the first unidirectional conduction unit and the second unidirectional conduction unit.

[0105] Figure 7 FIG. 4 is a schematic diagram of a conversion circuit in an embodiment. As Figure 7 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] Wherein, 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 an off state, the fifth transistor Q7 is in an off state, the fourth transistor Q6 is in an on state, and the sixth transistor Q8 will also be in an on state, the first path is conducting, and the second path is disconnected.

[0108] If the first control signal is at a high level, the third transistor Q5 is in an on state, the fifth transistor Q7 is in an on state, the fourth transistor Q6 is in an off state, and the sixth transistor Q8 will also be in an off state, the first path is disconnected, and the second path is conducting.

[0109] In the above embodiments, the first control module 201 further includes a fourth switch unit. The fourth switch unit 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, therefore, the conduction of the first path or the second path can also be reliably controlled through the sixth transistor Q8.

[0110] In an exemplary embodiment, optionally, when the first control signal is at the second level, the start 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. Taking the relay in the inverter circuit as an example of the first element, the closing 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, it can be ensured that the first element is started after switching to the second conversion unit 2022 for operation, 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 respectively connected to the emitter of the second transistor Q4 and the second end of the coil. (4) Resistor R10. Resistor R10 is respectively connected to the feedback winding 101 and the base of the second transistor Q4. (5) Resistor R11. Resistor R11 is respectively connected to the collector of the first transistor Q3 and the base of the second transistor Q4. (6) Resistor R12. Resistor R12 is respectively connected to the emitter and the base of the fifth transistor Q7. (7) Resistor R13. Resistor R13 is respectively connected to the positive electrode of the diode D4 and the base of the fifth transistor Q7. (8) Resistor R14. Resistor R14 is respectively connected to the input terminal and the enable terminal of the first conversion unit 2021. (9) Resistor R15. Resistor R15 is respectively connected to the base of the fourth transistor Q6 and the drain of the third transistor Q5. (10) Resistor R16. One end of resistor R16 is connected to the base of the fourth transistor Q6, and the other end of resistor R16 is grounded. (11) Resistor R17. Resistor R17 is respectively connected to the feedback winding 101 and the positive electrode of the diode D3. (12) Resistor R18. Resistor R18 is respectively connected to the emitter and the base of the sixth transistor Q8. (13) Resistor R19. Resistor R19 is respectively connected to the base of the sixth transistor Q8 and the collector of the fourth transistor Q6. (14) Capacitor C4. The first end of capacitor C4 is connected to the output terminal 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 at least one of the above resistors or capacitors, the stability and reliability of the conversion circuit 200 can be further improved.

[0114] Figure 8 It is the fifth schematic diagram of a conversion circuit in an embodiment, as Figure 8 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] Among them, the second control module 203 is used to respond to the second control signal of the second element and control the first control module 201 to turn on the first path when the second control signal is used to indicate the start of the second element.

[0116] Optionally, the feedback winding 101 is used to power the second component. That is, the startup of the second component causes the feedback voltage to drop, resulting in the power of the secondary winding 102 being not greater than the power of the feedback winding 101. Exemplarily, the second component includes but is not limited to the above-mentioned fan.

[0117] The second control signal can be used to control the second component to start or stop working. Among them, 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 component to stop working. When the second control signal is at the fourth level, the second control signal is used to control the second component to start. The third level and the fourth level can be set according to requirements. Exemplarily, the third level can be a low level, and the fourth level can be a high level.

[0118] Optionally, the second control module 203 may include at least one switching element. In this way, when the second control module 203 receives the fourth level, the switching element in the second control module 203 can be used to control the first path to conduct.

[0119] In the above embodiment, since the conversion circuit 200 further includes the first control module 201 and the second control module 203, and the first control module 201 can respond to the second control signal of the second component. When the second control signal is used to indicate the startup of the second component, the first control module 201 is controlled to conduct the first path. In this way, when the startup of the second component may cause the feedback voltage to drop, the first conversion unit 2021 with high conversion efficiency can be switched back in time, so that the energy coupling between the feedback winding 101 and the secondary winding 102 is balanced.

[0120] To more clearly introduce the conversion circuit 200 of the present application, the following will be described in conjunction with the working process of the energy storage power supply.

[0121] Please refer to Figure 4 , in working process 1, the relay in the inverter circuit is not started, the first control signal RLY_Drv is at a low level, the first transistor Q3 is in a cut-off state, the base and emitter of the second transistor Q4 are at the same potential, and the second transistor Q4 is also in a cut-off state. There is no current path in the coil of the relay RLY1, the relay RLY1 does not work, the relay RLY1 keeps the connection between pin 3 and pin 4, the first path is conducted, and the feedback voltage of the feedback winding 12V_P is converted into a preset voltage of 5V through the first conversion unit 2021. At this time, the power of the feedback winding 12V_P is relatively balanced with the power of the secondary winding 12V_S, and the secondary voltage changes little, which does not affect normal operation.

[0122] During the 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 conducting state, 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 conducting state. The coil of the relay RLY1 forms a current loop under the power supply of the feedback winding 12V_P, and the relay RLY1 works. The relay RLY1 switches from connecting pin 3 to pin 4 to connecting pin 3 to pin 5, and the second path conducts. The feedback voltage of the feedback winding 12V_P is converted into a preset voltage of 5V by the second conversion unit 2022. If the working power of the relay RLY1 is 1.5W, the power of the feedback winding 12V_P on the display screen and the control chip is about 2.5W, the total power of the feedback winding 12V_P is 5W, the total power of the secondary winding 12V_S is 2W. The power of the feedback winding 12V_P is much larger than that of the secondary winding 12V_S, and the voltage of the secondary winding 12V_S will rise, which does not affect the normal operation. It should be noted that in order to improve the reliability, the withstand voltage value of the device powered by the voltage of the secondary winding 12V_S should be greater than the voltage after the voltage of the secondary winding 12V_S rises.

[0123] Moreover, the first control signal RLY_Drv is the signal for controlling the suction of the relay in the inverter circuit and for controlling the conduction of the first transistor Q3. Since it takes a certain time for the relay RLY1 to switch, in order to avoid the relay in the inverter circuit being suctioned before the relay RLY1 has completed the switch, resulting in a voltage drop in the secondary winding 12V_S, thus causing the suction failure of the relay in the inverter circuit. Therefore, the suction time of the relay in the inverter circuit controlled by the first control signal RLY_Drv needs to be delayed compared to the conduction time of the first transistor Q3.

[0124] After the delay, the relay in the inverter circuit is suctioned. 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 5W. In this way, the conversion loss of the second conversion unit 2022 can be used to make the energy coupling on both sides relatively balanced.

[0125] Furthermore, the relay in the inverter circuit completes the suction, 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. During working process 1, the first control signal RLY_Drv is at a low level, the third transistor Q5 is in the cut-off state, making the base and emitter of the fifth transistor Q7 at the same potential, and the fifth transistor Q7 is in the cut-off state. Also, at this time, the base of the fourth transistor Q6 is at a high level, the fourth transistor Q6 is in the conducting state, pulling the enable EN pin of the first conversion unit 2021 to the ground, the first path is conducting, and the second path is disconnected.

[0127] During working process 2, the first control signal RLY_Drv is at a high level, the third transistor Q5 is in the conducting state, 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, the fifth transistor Q7 is in the cut-off state, the base of the fourth transistor Q6 is at a low level, the fourth transistor Q6 is in the conducting 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 conducting.

[0128] Similarly, the closing time of the relay in the inverter circuit controlled by the first control signal RLY_Drv needs to be delayed compared to the conduction time of controlling the third transistor Q5.

[0129] Please refer to Figure 7 , and Figure 6 The control principle is similar. During working process 1, the first control signal RLY_Drv is at a low level, the third transistor Q5 is in the cut-off state, the base and emitter of the fifth transistor Q7 are at the same potential, and the fifth transistor Q7 is in the cut-off state. Also, at this time, the base of the fourth transistor Q6 is at a high level, the fourth transistor Q6 is in the conducting state, thereby pulling up the base potential of the sixth transistor Q8, making the sixth transistor Q8 also in the conducting state, the first path is conducting, and the second path is disconnected.

[0130] During working process 2, the first control signal RLY_Drv is at a high level, the third transistor Q5 is in the conducting state, 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, the fifth transistor Q7 is also in the conducting state, while the base of the fourth transistor Q6 is at a low level, the fourth transistor Q6 is in the cut-off state, so that the sixth transistor Q8 is also in the cut-off state, the first path is disconnected, and the second path is conducting.

[0131] Similarly, the closing time of the relay in the inverter circuit controlled by the first control signal RLY_Drv needs to be delayed compared to the conduction time of controlling the third transistor Q5.

[0132] Thus, when operating under no load or just starting to charge and discharge, the display screen and the control chip are powered by a preset voltage converted by the 12V_P voltage through the first conversion unit to operate with low power consumption, reducing the battery power consumption; when the relay of the inverter circuit needs to be pulled in, it is powered by a preset voltage converted by the second conversion unit. By using the conversion loss of the second conversion unit to increase the load on the feedback winding 12V_P, the secondary voltage of the secondary winding 12V_S can be raised, so that when the relay of the inverter circuit is pulled in, there is enough energy on the feedback winding 12V_P to prevent the secondary voltage of the secondary winding 12V_S from dropping below the minimum pull-in voltage of the relay, thus completing the pull-in and ensuring the normal operation of the energy storage power supply. When the charging or discharging power increases and the fan starts to rotate and work, it is switched back to the first conversion unit to operate with low power consumption, reducing the battery power consumption and increasing the operation duration of the energy storage power supply.

[0133] It can be seen that the conversion circuit of this embodiment only switches the voltage conversion module when the relay of the inverter circuit needs to be pulled in, so as to increase the load on the feedback winding 12V_P to ensure that the relay of the inverter circuit is pulled in and guarantee the normal operation of the energy storage power supply. The rest of the time, it operates with low power consumption. Moreover, no additional control signal is required, and it can be realized by reusing the control signal of the relevant flyback circuit.

[0134] Figure 9 Schematic diagram of an energy storage power supply in an embodiment, as Figure 9 shown, in an embodiment, an energy storage power supply 900 is further provided. The energy storage power supply 900 includes a flyback circuit 100 and the conversion circuit 200 of any one of the above.

[0135] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0136] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope recorded in the present application.

[0137] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to 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 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, and the conversion efficiency of the second conversion unit is less than that of the first conversion unit; The first control module is configured 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 condition, and control the conduction of a second path between the feedback winding and the second conversion unit when the flyback circuit meets the 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, wherein The first control module is further configured to receive a first control signal of a first component, and when the first control signal is 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 conduction of the first path; And when the first control signal is a second level for controlling the first component to start, determine that the flyback circuit meets the switching condition, so as to control the conduction of the second path; Wherein, the secondary winding is used to supply power to the first component.

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. The relay control unit is also connected to the feedback winding; The relay control unit is configured to receive the first control signal, output a first switching signal to the relay switching unit when the first control signal is the first level, and output a second switching signal to the relay switching unit when the first control signal is the second level; The relay switching unit is configured to control the conduction of the first path when receiving the first switching signal, and control the conduction of the second path when receiving the second switching signal.

4. The conversion circuit according to claim 3, wherein The relay control unit includes a first sub-unit and a second sub-unit connected to each other; the first sub-unit is configured to receive the first control signal, and the second sub-unit is connected to the relay switching unit; The first sub-unit is configured to be in a cut-off state when the first control signal is the first level, and control the second sub-unit to be in a cut-off state, so that the second sub-unit outputs the first switching signal to the relay switching unit, and be in a conducting state when the first control signal is the second level, and control the second sub-unit to be in a conducting state, so that the second sub-unit 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 configured 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 further 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.

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

7. The conversion circuit according to claim 2, wherein The first control module includes a first switch unit, a second switch unit, and a third switch unit; the first switch unit is respectively connected to the second switch unit and the third switch unit, the second switch unit is respectively connected to the feedback winding and the first conversion unit, and the third switch unit is respectively connected to the feedback winding and the second conversion unit; The first switch unit is configured to receive the first control signal, be in a cut-off state when the first control signal is the first level, and be in a conducting state when the first control signal is the second level; The second switch unit is configured to be in a conducting state when the first switch unit is in a cut-off state and control the first path to conduct, and be in a cut-off state when the first switch unit is in a conducting state and control the first path to disconnect; The third switch unit is configured to be in a cut-off state when the first switch unit is in a cut-off state and control the second path to disconnect, and be in a conducting state when the first switch unit is in a conducting state and control the second path to conduct.

8. The conversion circuit according to claim 7, wherein 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 configured to receive the first control signal, the source of the third transistor is grounded, and the drain of the third transistor is respectively connected to the base of the fourth transistor and the base of the fifth transistor; 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 further connected to the feedback winding; The emitter of the fifth transistor is connected to the feedback winding, and the collector of the fifth transistor is connected to the second conversion unit.

9. The conversion circuit according to claim 8, wherein, The first control module further 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, and the negative electrode of the first unidirectional conduction unit is connected to the drain of the third transistor; The positive electrode of the second unidirectional conduction unit is connected to the base of the fifth transistor, and the negative electrode of the second unidirectional conduction unit is connected to the drain of the third transistor.

10. The conversion circuit according to claim 9, wherein The first control module further includes a fourth switching unit, and the fourth switching unit includes a sixth transistor; The emitter of the sixth transistor is connected to the feedback winding, the collector of the sixth transistor is connected to the first conversion unit, and the base of the sixth transistor is connected to the collector of the fourth transistor.

11. The conversion circuit according to any one of claims 1-5, 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 turn on the first path when the second control signal is used to indicate the start of the second element.

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

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