A self-excited flyback circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supply mainly provides self -excitation type flyback circuit and energy storage system, and this circuit includes transformer, and the self -excitation module and energy storage module connected with transformer respectively, and the voltage stabilizing module connected with energy storage module, and the voltage stabilizing module still connects with self -excitation module. Self -excitation module controls transformer to start according to power supply to enter first working condition;Self -excitation module receives feedback signal and enters second working condition when transformer works, makes transformer stop;With the disappearance of feedback signal, self -excitation module starts transformer again, based on this, can realize the purpose of self -excitation type flyback, and then saves the cost of energy storage system. And after transformer starts, transformer charges energy storage module while power supply of electrical equipment;When transformer stops, energy storage module discharges and supplies power, realizes uninterrupted power supply. Voltage stabilizing module is used for detecting energy storage module electric quantity, and when exceeding preset threshold value, works through self -excitation module control transformer, thereby realizes stable power supply.

Description

[Technical Field] This utility model relates to the technical field of energy storage power supply, and in particular to a self-excited flyback circuit and energy storage system. [Background Technology] In the power supply system of power electronic equipment, the auxiliary power supply plays an important role in providing stable low-voltage DC power to key modules such as control circuits and drive circuits. Its performance directly affects the reliability and stability of the entire equipment.

[0001] Currently, conventional auxiliary power circuits generally adopt a flyback topology. Although this structure can achieve efficient power conversion and electrical isolation, meeting basic power supply requirements, it has significant limitations in practical applications: To maintain the stable operation of the flyback topology, such circuits require a dedicated driver chip to achieve precise pulse width modulation (PWM) control, switching transistor drive, and protection functions. This not only leads to a complex circuit structure and an increased number of components, but also directly increases the overall hardware cost. At the same time, the complex circuit design makes troubleshooting more difficult during later maintenance, requiring the driver chip and its peripheral circuits to be tested one by one, increasing maintenance time and costs. [Utility Model Content] This utility model provides a self-excited flyback circuit and energy storage system, aiming to solve the technical problem of high cost of self-excited circuits in the prior art.

[0002] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a self-excited flyback circuit, wherein the self-excited flyback circuit includes a self-excited module, a transformer, an energy storage module, and a voltage regulator module. The self-excited module is connected to the primary side of the transformer, the secondary side of the transformer is connected to the energy storage module, the energy storage module is connected to the voltage stabilizing module, the voltage stabilizing module is also connected to the self-excited module, the self-excited module and the primary side of the transformer are also used to connect to the power supply, and the energy storage module is also used to connect to the electrical equipment. The self-excitation module is used to, upon receiving the output voltage of the power supply but not receiving a feedback signal, enter a first operating state based on the output voltage, thereby controlling the transformer to start working, and thus causing the transformer to output a current signal and a feedback signal; and Upon receiving the output voltage and the feedback signal, the transformer enters a second working state based on the feedback signal, thereby stopping the transformer from working and thus stopping the output current signal and the feedback signal. The energy storage module is configured to, upon receiving the current signal, begin charging based on the current signal and output the current signal to the electrical device to supply power to the electrical device; and Discharge begins when no current signal is received, thereby continuously supplying power to the electrical equipment; The voltage regulator module is used to detect the voltage stored in the energy storage module in real time, and outputs a control signal to the self-excited module when the stored voltage exceeds a preset threshold, so that the self-excited module enters the second working state, thereby stopping the energy storage module from charging and stabilizing the voltage stored in the energy storage module within a preset range.

[0003] Optionally, the primary side of the transformer includes a main winding and a feedback winding, and the secondary side of the transformer includes an auxiliary winding; The self-excitation module includes a switching unit and a control unit; The switching unit is connected to the main winding and the feedback winding of the transformer respectively. The control unit is connected to the switching unit. The switching unit is also used to connect to the power supply. The auxiliary winding of the transformer is connected to the energy storage module. The switching unit receives the output voltage of the power supply and enters an amplified conduction state based on the output voltage, thereby enabling the transformer to start working. This causes the feedback winding of the transformer to output a feedback signal, and the auxiliary winding of the transformer to output a current signal. When the feedback signal is received, the system enters a saturated conduction state based on the feedback signal, thereby outputting a first drive signal to the control unit. The control unit is used to control the switching unit to turn off according to the first driving signal when it receives the first driving signal, thereby causing the transformer to stop working, and then controlling the feedback winding of the transformer to stop outputting feedback signals, and the auxiliary winding of the transformer to stop outputting current signals.

[0004] Optionally, the switching unit includes a switching transistor Q1, a resistor Rm, and a resistor R5; The control terminal of the switch Q1 is connected to the feedback winding of the transformer and the power supply, respectively. The control terminal of the switch Q1 is also connected to the control unit. The first terminal of the switch Q1 is connected to the main winding of the transformer, and the second terminal of the switch Q1 is connected to the control unit. The second terminal of the switch Q1 is also grounded through the resistor Rm.

[0005] Optionally, the control unit includes a switching transistor Q2 and a resistor R13; The control terminal of the switch Q2 is connected to the second terminal of the switch Q1 through the resistor R13, the first terminal of the switch Q2 is connected to the resistor R5, and the second terminal of the switch Q2 is used for grounding.

[0006] Optionally, the energy storage module includes a diode D1, a capacitor CE1, and a capacitor C3; The anode of diode D1 is connected to the auxiliary winding of the transformer, the cathode of diode D1 is connected to capacitor CE1 and the electrical equipment respectively, capacitor EC1 is also used for grounding, and capacitor C3 is connected in parallel with capacitor CE1.

[0007] Optionally, the voltage regulator module includes a detection unit and an isolation unit; The detection unit is connected to the energy storage module and the isolation unit respectively, and the isolation unit is connected to the control unit; The detection unit is used to detect the voltage stored in the energy storage module, and when the stored voltage exceeds a preset threshold, it outputs a control signal to the control unit through the isolation unit, so that the control unit controls the switching unit to turn off, thereby causing the transformer to stop working.

[0008] Optionally, the detection unit includes resistor R8, resistor R14, and voltage regulator U2; The resistor R8 is connected to the energy storage module, and the resistor R8 is also grounded through the resistor R14. The reference input terminal of the voltage regulator U2 is connected to the resistor R8. The cathode of the voltage regulator U2 is connected to the isolation unit, and the anode of the voltage regulator U2 is used for grounding.

[0009] Optionally, the self-excited flyback circuit further includes an overcurrent detection module; The overcurrent detection module is connected to the cathode of the diode D1 and the control unit respectively, and the overcurrent detection module is also used to connect to the electrical equipment. The overcurrent detection module is used to detect the current signal output by the diode D1, and when the current signal is greater than the current threshold, it outputs a second drive signal to the control unit to turn off the switching unit.

[0010] Optionally, the overcurrent detection module includes a switch Q3, a diode D3, a resistor Rn, and a resistor R16; The control terminal of the switch Q3 is connected to the first terminal of the switch Q3 through the resistor Rn. The resistor Rn is also connected to the cathode of the diode D1. The control terminal of the switch Q3 is also used to connect to the electrical equipment. The second terminal of the switch Q3 is connected to the anode of the diode D3 through the resistor R16. The cathode of the diode D3 is connected to the control unit.

[0011] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is: to provide an energy storage system, the energy storage system comprising: Power supply; Electrical equipment; and The self-excited flyback circuit described above.

[0012] Unlike related technologies, this utility model provides a self-excited flyback circuit and energy storage system. The circuit includes a self-excited module, a transformer, an energy storage module, and a voltage regulator module. The self-excited module is connected to the primary side of the transformer, the secondary side of the transformer is connected to the energy storage module, the energy storage module is connected to the voltage regulator module, and the voltage regulator module is also connected to the self-excited module. The self-excited module and the primary side of the transformer are also used to connect to a power supply, and the energy storage module is also used to connect to electrical equipment. When the self-excited module receives the output voltage from the power supply, it enters a first operating state based on the output voltage, thereby controlling the transformer to start working. After the transformer starts working, the self-excited module receives a feedback signal and enters a second operating state based on the feedback signal, thereby controlling the transformer to stop working. When the transformer stops working, the self-excited module stops receiving feedback signals, and the self-excited module re-enters the first operating state, thereby controlling the transformer to start working again. This achieves the purpose of self-excited flyback without the need for complex external control signals, thus saving the cost of the energy storage system. When the transformer starts working, it outputs a current signal to charge the energy storage module and simultaneously supplies power to the electrical device. When the transformer stops working, the energy storage module discharges to power the device. This ensures uninterrupted power supply. During the charging process, the voltage regulator module continuously monitors the stored energy level. If the stored energy exceeds a preset threshold, the self-excited module controls the transformer to stop working, stabilizing the supply voltage within a preset range and improving the reliability of the energy storage system. [Attached Image Description] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0013] Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention; Figure 2 This is a structural block diagram of a self-excited flyback circuit provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of a self-excited flyback circuit provided in an embodiment of this utility model.

Detailed Implementation Methods

[0014] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0015] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0016] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0017] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0018] Please see Figure 1 , Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the energy storage system 100 includes a power supply 10, an electrical device 20, and a self-excited flyback circuit 30. The self-excited flyback circuit 30 is connected to both the power supply 10 and the electrical device 20. The self-excited flyback circuit 30 receives the output voltage from the power supply 10 and starts operating based on that output voltage, thereby outputting a stable power supply voltage to the electrical device 20, enabling the electrical device 20 to operate stably. It should be noted that the power supply 10 can be a photovoltaic input source, a battery, or other power supply equipment; the electrical device 20 can be a load or other electrical device, or an energy storage device such as a battery.

[0019] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a self-excited flyback circuit provided in an embodiment of the present invention, as shown below. Figure 2As shown, the self-excited flyback circuit 30 includes a self-excited module 31, a transformer T1, an energy storage module 32, and a voltage regulator module 33; The self-excited module 31 is connected to the primary side of the transformer T1, the secondary side of the transformer T1 is connected to the energy storage module 32, the energy storage module 32 is connected to the voltage stabilizing module 33, the voltage stabilizing module 33 is also connected to the self-excited module 31, the self-excited module 31 and the primary side of the transformer T1 are also used to connect to the power supply 10, and the energy storage module 32 is also used to connect to the electrical equipment 20; The self-excited module 31 is used to enter a first working state based on the output voltage when it receives the output voltage of the power supply 10 but does not receive a feedback signal, thereby controlling the transformer T1 to start working, and causing the transformer T1 to output a current signal and a feedback signal; and When the output voltage is received and the feedback signal is received, the transformer T1 stops working and stops outputting the current signal and the feedback signal. The energy storage module 32 is used to start charging based on the current signal after receiving the current signal, and output the current signal to the electrical device 20 to supply power to the electrical device 20; and Discharge begins when no current signal is received, thereby continuously supplying power to the electrical equipment 20; The voltage regulator module 33 is used to detect the voltage stored in the energy storage module 32 in real time, and outputs a control signal to the self-excited module 31 when the stored voltage exceeds a preset threshold, so that the self-excited module 31 enters the second working state, thereby stopping the energy storage module 32 from charging, and stabilizing the voltage stored in the energy storage module 32 within a preset range.

[0020] Specifically, when the energy storage system 100 starts working, the power supply 10 outputs voltage. At this time, the self-excited module 31 receives the output voltage and enters a first working state based on the output voltage. When the self-excited module 31 enters the first working state, the transformer T1 also operates, thereby outputting a feedback signal and a current signal. When the transformer T1 outputs a feedback signal, the self-excited module 31 receives the feedback signal and enters a second working state based on the output voltage and the feedback signal. When the self-excited module 31 operates in the second working state, the transformer T1 stops working, thereby stopping the output of the feedback signal and the current signal. After the transformer T1 stops outputting the feedback signal, the self-excited module 31 will again enter the first working state based on the output voltage, thereby controlling the transformer T1 to output the feedback signal and the current signal. Based on this, the purpose of self-excited flyback can be achieved.

[0021] Furthermore, when the transformer T1 outputs a current signal, the energy storage module 32 receives the current signal and begins charging based on it. Simultaneously, the energy storage module 32 also outputs the current signal to the electrical device 20 to supply power. When the transformer T1 stops outputting the current signal, the energy storage module 32 exits the charging state and begins discharging based on the stored voltage, thus continuously supplying power to the electrical device 20. Based on this, a stable DC voltage can be output to the electrical device 20, enabling it to operate reliably.

[0022] During the charging process of the energy storage module 32, the voltage regulator module 33 monitors the voltage stored in the energy storage module 32 in real time. When the stored voltage exceeds a preset threshold, it outputs a control signal to the self-excited module 31, causing the self-excited module 31 to enter a second working state according to the control signal, thereby controlling the transformer T1 to stop working. It should be noted that when the voltage regulator module 33 outputs a control signal to the self-excited module 31, regardless of whether the self-excited module 31 receives the feedback signal, the self-excited module 31 will enter the second working state to control the transformer T1 to stop working, thereby causing the transformer T1 to stop outputting current signals and stabilizing the output voltage at the preset threshold, thus avoiding damage to the electrical equipment 20 due to excessive supply voltage.

[0023] In yet another embodiment, such as Figure 2 As shown, the self-excited module 31 includes a switching unit 311 and a control unit 312; the primary side of the transformer T1 includes a main winding (not shown) and a feedback winding (not shown), and the secondary side of the transformer includes an auxiliary winding (not shown). The switching unit 311 is connected to the main winding and the feedback winding of the transformer T1 respectively. The control unit 312 is connected to the switching unit 311. The switching unit 311 is also used to connect to the power supply 10. The auxiliary winding of the transformer T1 is connected to the energy storage module 32. The switching unit 311 is used to receive the output voltage of the power supply 10, and enters an amplified conduction state based on the output voltage, thereby causing the transformer T1 to start working, and thus causing the feedback winding of the transformer T1 to output a feedback signal, and the auxiliary winding of the transformer T1 to output a current signal; and When the feedback signal is received, the system enters a saturated conduction state based on the feedback signal, thereby outputting a first drive signal to the control unit 312; When the control unit 312 receives the first drive signal, it controls the switching unit 311 to turn off according to the first drive signal, thereby causing the transformer T1 to stop working, and then controls the feedback winding of the transformer T1 to stop outputting feedback signals, and the auxiliary winding of the transformer T1 to stop outputting current signals.

[0024] Specifically, when the power supply 10 outputs the output voltage, the switching unit 311 receives the output voltage and enters an amplified conduction state based on it. When the switching unit 311 enters the amplified conduction state, the transformer T1 also operates. At this time, the feedback winding of the transformer T1 outputs a feedback signal, and the auxiliary winding of the transformer T1 outputs a current signal. When the feedback winding of the transformer T1 outputs the feedback signal, the switching unit 311 receives the feedback signal and enters a saturated conduction state based on the output voltage and the feedback signal, thereby outputting a first drive signal to the control unit 312. When the control unit 312 receives the first drive signal, it starts operating according to the first drive signal. After the control unit 312 starts operating, it controls the switching unit 311 to turn off. When the switching unit 311 turns off, the transformer T1 stops operating, thereby causing the feedback winding of the transformer T1 to stop outputting the feedback signal, and the auxiliary winding of the transformer T1 to stop outputting the current signal. It should be noted that when the switching unit 311 is turned off, it will stop outputting the first drive signal to the control unit 312. The control unit 312 will stop working when it does not receive the first drive signal, thereby causing the switching unit 311 to re-enter the amplification and conduction state according to the output voltage. Based on this, the purpose of self-excited flyback can be achieved.

[0025] When the auxiliary winding of the transformer T1 outputs a current signal, the energy storage module 32 charges based on the current signal and outputs the current signal to the electrical device 20 to supply power to the electrical device 20; when the auxiliary winding of the transformer T1 stops outputting a current signal, the energy storage module 32 starts discharging, thereby enabling the electrical device 20 to continue to work.

[0026] In another embodiment, please refer to Figure 3 , Figure 3 This is a circuit diagram of a self-excited flyback circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the switching unit 311 includes a switching transistor Q1, a resistor Rm, and a resistor R5; the control unit 312 includes a switching transistor Q2 and a resistor R13. The control terminal of the switch Q1 is connected to the feedback winding of the transformer T1 and the power supply 10, respectively. The control terminal of the switch Q1 is also connected to the control unit 312. The first end of the switch Q1 is connected to the main winding of the transformer T1, and the second end of the switch Q1 is connected to the control unit 312. The second end of the switch Q1 is also grounded through the resistor Rm.

[0027] The control terminal of the switch Q2 is connected to the second terminal of the switch Q1 through the resistor R13, the first terminal of the switch Q2 is connected to the resistor R5, and the second terminal of the switch Q2 is used for grounding.

[0028] Specifically, when the energy storage system 100 starts working, the control terminal of the switch Q1 receives the output voltage of the power supply 10 through the resistor R5 and enters an amplified conduction state based on the output voltage. When the switch Q1 enters the amplified conduction state, current flows through the main winding of the transformer T1, and the transformer T1 starts working. This causes the feedback winding of the transformer T1 to generate a feedback signal, and the auxiliary winding of the transformer T1 to generate a corresponding current signal. At this time, the switch Q1 receives this feedback signal and enters a saturated conduction state based on the feedback signal. When the switch Q1 enters the saturated conduction state, a corresponding voltage drop occurs across the resistor Rm, causing the switch Q2 to conduct. When the switch Q2 conducts, the voltage at the control terminal of the switch Q1 is pulled low by the switch Q2, at which point the switch Q1 is turned off. When the switch Q1 is turned off, no current flows through the main winding of the transformer T1, the feedback winding of the transformer T1 stops outputting feedback signals, and at the same time, the auxiliary winding of the transformer T1 stops outputting current signals.

[0029] When switch Q1 is turned off, the control terminal of switch Q2 is also turned off because it does not receive voltage. At this time, the control terminal of switch Q1 is pulled high by the output voltage of the power supply 10, causing switch Q1 to re-enter the amplification and conduction state according to the output voltage. Based on this, the purpose of self-excited flyback can be achieved.

[0030] In another embodiment, such as Figure 3 As shown, the energy storage module 32 includes a diode D1, a capacitor CE1, and a capacitor C3; The anode of diode D1 is connected to the auxiliary winding of transformer T1, the cathode of diode D1 is connected to capacitor CE1 and electrical equipment 20 respectively, capacitor EC1 is also used for grounding, and capacitor C3 is connected in parallel with capacitor CE1.

[0031] Specifically, when the switching transistor Q1 is turned on, current flows through the main winding of the transformer T1, causing a corresponding current signal to be generated in the auxiliary winding of the transformer T1. When the auxiliary winding of the transformer T1 outputs the current signal, this current signal is input to capacitors CE1 and C3 through diode D1 to charge them. Simultaneously, this current signal is also output to the electrical device 20 through diode D1 to supply power to the electrical device 20.

[0032] When the switching transistor Q1 is turned off, the auxiliary winding of the transformer T1 will stop outputting current signals. At this time, due to the unidirectional conductivity of the diode D1, the voltage stored in the capacitors CE1 and C3 will be output to the electrical device 20 to continuously supply power to the electrical device 20.

[0033] In some embodiments, such as Figure 2 As shown, the voltage regulator module 33 includes a detection unit 331 and an isolation unit 332; The detection unit 331 is connected to the energy storage module 32 and the isolation unit 332 respectively, and the isolation unit 332 is connected to the control unit 312; The detection unit 331 is used to detect the voltage stored in the energy storage module 32, and when the stored voltage exceeds a preset threshold, the isolation unit 332 outputs a control signal to the control unit 312 so that the control unit 312 controls the switching unit 311 to turn off, thereby causing the transformer T1 to stop working.

[0034] When the transformer T1 outputs the current signal, the energy storage module 32 begins charging based on the current signal. During the charging process, the detection unit 331 monitors the voltage stored in the energy storage module 32 in real time. If the stored voltage exceeds the preset threshold, the detection unit 331 outputs a control signal to the control unit 312 via the isolation unit 332. This causes the control unit 312 to control the switching unit 311 to turn off, thereby stopping the transformer T1 from operating. When the transformer T1 stops operating, the energy storage module 32 stops charging. Based on this, the output voltage can be stabilized at the preset threshold, thus providing a stable power supply to the electrical device 20. It should be noted that the isolation unit 312 is used to electrically isolate the control signal to improve circuit stability.

[0035] In yet another embodiment, such as Figure 3 As shown, the detection unit includes resistor R8, resistor R14 and voltage regulator U2; the isolation unit 312 includes optocoupler U1, resistor R7 and resistor R10; The resistor R8 is connected to the energy storage module 32. The resistor R8 is also grounded through the resistor R14. The reference input terminal of the voltage regulator U2 is connected to the resistor R8. The cathode of the voltage regulator U2 is connected to the isolation unit 332. The anode of the voltage regulator U2 is used for grounding.

[0036] The first pin of the optocoupler U1 is connected to the energy storage module 32 through the resistor R7. The first pin of the optocoupler U1 is also connected to the resistor R10. The second pin of the optocoupler U1 is connected to the resistor R10 and the cathode of the voltage regulator U2, respectively. The third pin of the optocoupler U1 is connected to the control unit 312. The fourth pin of the optocoupler U1 is connected to the feedback winding of the transformer T1.

[0037] It should be noted that the operating state of the voltage regulator is determined based on the voltage input to the reference input terminal. The voltage regulator only starts working when the voltage input to the reference input terminal is greater than the reference voltage of the voltage regulator.

[0038] When the auxiliary winding of the transformer T1 outputs a current signal to charge the energy storage module 32, resistors R8 and R14 acquire the voltage stored in the energy storage module 32 and divide the stored voltage. If the voltage across resistor R14 is greater than the reference voltage of the voltage regulator U2, the voltage regulator U2 starts operating, causing a corresponding voltage drop across resistor R10, and the optocoupler U1 starts operating. Once the optocoupler U1 starts operating, it outputs a control signal to the control unit 312, causing the control unit 312 to start operating based on the control signal. After the control unit 312 starts operating, the switching unit 311 turns off, causing the transformer T1 to stop outputting a current signal, thus stopping the charging of the energy storage module 32. This prevents the voltage stored in the energy storage module 32 from exceeding a preset threshold, thereby stabilizing the power supply voltage of the electrical equipment 20.

[0039] In yet another embodiment, such as Figure 2 As shown, the self-excited flyback circuit 30 also includes an overcurrent detection module 34; The overcurrent detection module 34 is connected to the cathode of the diode D1 and the control unit 312 respectively, and the overcurrent detection module 34 is also used to connect to the electrical equipment 20; The overcurrent detection module 34 is used to detect the current signal output by the diode D1, and when the current signal is greater than the current threshold, it outputs a second drive signal to the control unit 312 to turn off the switching unit 311.

[0040] Specifically, when the auxiliary winding of the transformer T1 outputs a current signal, the current signal is output to the overcurrent detection module 34 through the diode D1. Upon receiving the current signal, the overcurrent detection module 34 checks whether the current signal exceeds a current threshold. If the current signal exceeds the current threshold, it outputs a second drive signal to the control unit 312, causing the control unit 312 to start operating based on the second drive signal. After the control unit 312 starts operating, the switching unit 311 is turned off, causing the transformer T1 to stop operating, and the auxiliary winding of the transformer T1 to stop outputting a current signal. Based on this, overcurrent protection is achieved, thereby preventing damage to the electrical equipment 20 and improving the reliability of the energy storage system 100.

[0041] It is understood that the first drive signal, the second drive signal, and the control signal are all used to control the control unit 312 to start working. That is, in some embodiments, the first drive signal, the second drive signal, and the control signal can be the same signal.

[0042] In yet another embodiment, such as Figure 3 As shown, the overcurrent detection module 34 includes a switch Q3, a diode D3, a resistor Rn, and a resistor R16; The control terminal of the switch Q3 is connected to the first terminal of the switch Q3 through the resistor Rn. The resistor Rn is also connected to the cathode of the diode D1. The control terminal of the switch Q3 is also used to connect to the electrical equipment 20. The second terminal of the switch Q3 is connected to the anode of the diode D3 through the resistor R16. The cathode of the diode D3 is connected to the control unit 312.

[0043] Specifically, when the auxiliary winding of the transformer T1 outputs a current signal, this current signal flows into the resistor Rn through the diode D1. At this time, a corresponding voltage drop is generated across the resistor Rn. If the voltage drop across the resistor Rn is less than the on-state voltage drop of the switch Q3, the current signal flows into the electrical device 20 to supply power to the electrical device 20. If the voltage drop across the resistor Rn is greater than the on-state voltage drop of the switch Q3, the switch Q3 is turned on. When the switch Q3 is turned on, the current signal flows into the control unit 312 through the resistor R16 and the diode D1, thereby controlling the control unit 312 to start working, which in turn controls the switch unit 311 to turn off, and the transformer T1 stops outputting a current signal.

[0044] This utility model embodiment provides a self-excited flyback circuit, which includes a self-excited module, a transformer, an energy storage module, and a voltage regulator module. The self-excited module is connected to the primary side of the transformer, the secondary side of the transformer is connected to the energy storage module, the energy storage module is connected to the voltage regulator module, and the voltage regulator module is also connected to the self-excited module. The self-excited module and the primary side of the transformer are also used to connect to a power supply, and the energy storage module is also used to connect to electrical equipment. When the self-excited module receives the output voltage of the power supply, it enters a first operating state based on the output voltage, thereby controlling the transformer to start working. After the transformer starts working, the self-excited module receives a feedback signal and enters a second operating state based on the feedback signal, thereby controlling the transformer to stop working. When the transformer stops working, the self-excited module stops receiving feedback signals, and the self-excited module re-enters the first operating state, thereby controlling the transformer to start working again. This achieves the purpose of self-excited flyback without the need for complex external control signals, thereby saving the cost of the energy storage system. When the transformer starts working, it outputs a current signal to charge the energy storage module and simultaneously supplies power to the electrical device. When the transformer stops working, the energy storage module discharges to power the device. This ensures uninterrupted power supply. During the charging process, the voltage regulator module continuously monitors the stored energy level. If the stored energy exceeds a preset threshold, the self-excited module controls the transformer to stop working, stabilizing the supply voltage within a preset range and improving the reliability of the energy storage system.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A self-excited flyback circuit, characterized in that, The self-excited flyback circuit includes a self-excited module, a transformer, an energy storage module, and a voltage regulator module; The self-excited module is connected to the primary side of the transformer, the secondary side of the transformer is connected to the energy storage module, the energy storage module is connected to the voltage stabilizing module, the voltage stabilizing module is also connected to the self-excited module, the self-excited module and the primary side of the transformer are also used to connect to the power supply, and the energy storage module is also used to connect to the electrical equipment. The self-excitation module is used to enter a first working state according to the output voltage when it receives the output voltage of the power supply and does not receive a feedback signal, thereby controlling the transformer to start working, and thus causing the transformer to output a current signal and a feedback signal. as well as Upon receiving the output voltage and the feedback signal, the transformer enters a second working state based on the feedback signal, thereby stopping the transformer from working and thus stopping the output current signal and the feedback signal. The energy storage module is used to start charging based on the current signal after receiving the current signal, and output the current signal to the electrical device to supply power to the electrical device; as well as Discharge begins when no current signal is received, thereby continuously supplying power to the electrical equipment; The voltage regulator module is used to detect the voltage stored in the energy storage module in real time, and outputs a control signal to the self-excited module when the stored voltage exceeds a preset threshold, so that the self-excited module enters the second working state, thereby stopping the energy storage module from charging and stabilizing the voltage stored in the energy storage module within a preset range.

2. The self-excited flyback circuit according to claim 1, characterized in that, The primary side of the transformer includes a main winding and a feedback winding, and the secondary side of the transformer includes an auxiliary winding. The self-excitation module includes a switching unit and a control unit; The switching unit is connected to the main winding and the feedback winding of the transformer respectively. The control unit is connected to the switching unit. The switching unit is also used to connect to the power supply. The auxiliary winding of the transformer is connected to the energy storage module. The switching unit is used to receive the output voltage of the power supply and enter the amplification and conduction state based on the output voltage, thereby enabling the transformer to start working, and then enabling the feedback winding of the transformer to output a feedback signal, and the auxiliary winding of the transformer to output a current signal. as well as When the feedback signal is received, the system enters a saturated conduction state based on the feedback signal, thereby outputting a first drive signal to the control unit. The control unit is used to control the switching unit to turn off according to the first driving signal when it receives the first driving signal, thereby causing the transformer to stop working, and then controlling the feedback winding of the transformer to stop outputting feedback signals, and the auxiliary winding of the transformer to stop outputting current signals.

3. The self-excited flyback circuit according to claim 2, characterized in that, The switching unit includes a switching transistor Q1, a resistor Rm, and a resistor R5; The control terminal of the switch Q1 is connected to the feedback winding of the transformer and the power supply, respectively. The control terminal of the switch Q1 is also connected to the control unit. The first terminal of the switch Q1 is connected to the main winding of the transformer, and the second terminal of the switch Q1 is connected to the control unit. The second terminal of the switch Q1 is also grounded through the resistor Rm.

4. The self-excited flyback circuit according to claim 3, characterized in that, The control unit includes a switching transistor Q2 and a resistor R13; The control terminal of the switch Q2 is connected to the second terminal of the switch Q1 through the resistor R13, the first terminal of the switch Q2 is connected to the resistor R5, and the second terminal of the switch Q2 is used for grounding.

5. The self-excited flyback circuit according to any one of claims 2-4, characterized in that, The energy storage module includes a diode D1, a capacitor CE1, and a capacitor C3. The anode of diode D1 is connected to the auxiliary winding of the transformer, the cathode of diode D1 is connected to capacitor CE1 and the electrical equipment respectively, capacitor EC1 is also used for grounding, and capacitor C3 is connected in parallel with capacitor CE1.

6. The self-excited flyback circuit according to claim 5, characterized in that, The voltage regulator module includes a detection unit and an isolation unit; The detection unit is connected to the energy storage module and the isolation unit respectively, and the isolation unit is connected to the control unit; The detection unit is used to detect the voltage stored in the energy storage module, and when the stored voltage exceeds a preset threshold, it outputs a control signal to the control unit through the isolation unit, so that the control unit controls the switching unit to turn off, thereby causing the transformer to stop working.

7. The self-excited flyback circuit according to claim 6, characterized in that, The detection unit includes resistor R8, resistor R14, and voltage regulator U2; The resistor R8 is connected to the energy storage module, and the resistor R8 is also grounded through the resistor R14. The reference input terminal of the voltage regulator U2 is connected to the resistor R8. The cathode of the voltage regulator U2 is connected to the isolation unit, and the anode of the voltage regulator U2 is used for grounding.

8. The self-excited flyback circuit according to claim 5, characterized in that, The self-excited flyback circuit also includes an overcurrent detection module; The overcurrent detection module is connected to the cathode of the diode D1 and the control unit respectively, and the overcurrent detection module is also used to connect to the electrical equipment. The overcurrent detection module is used to detect the current signal output by the diode D1, and when the current signal is greater than the current threshold, it outputs a second drive signal to the control unit to turn off the switching unit.

9. The self-excited flyback circuit according to claim 8, characterized in that, The overcurrent detection module includes a switch Q3, a diode D3, a resistor Rn, and a resistor R16; The control terminal of the switch Q3 is connected to the first terminal of the switch Q3 through the resistor Rn. The resistor Rn is also connected to the cathode of the diode D1. The control terminal of the switch Q3 is also used to connect to the electrical equipment. The second terminal of the switch Q3 is connected to the anode of the diode D3 through the resistor R16. The cathode of the diode D3 is connected to the control unit.

10. An energy storage system, characterized in that, The energy storage system includes: Power supply; Electrical equipment; and The self-excited flyback circuit as described in any one of claims 1-9.

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