Auxiliary power supply circuit, auxiliary power supply device and energy storage equipment

Abstract

The utility model relates to the technical field of auxiliary power supplies, and discloses an auxiliary power supply circuit, an auxiliary power supply device and energy storage equipment, and the auxiliary power supply circuit comprises a voltage conversion circuit which is used for receiving an input voltage signal, carrying out the voltage conversion processing of the input voltage signal, and generating a power supply signal; the driving circuit is connected with the voltage conversion circuit and the main control circuit and is used for receiving the switch enable signal sent by the main control circuit, generating a switch driving signal according to the switch enable signal and sending the switch driving signal to the voltage conversion circuit; the voltage conversion circuit is also used for controlling the voltage of the power supply signal according to the switch driving signal; the sampling circuit is connected with the output end of the voltage conversion circuit and is used for sampling the output end of the voltage conversion circuit and generating a sampling signal; and the main control circuit is connected with the driving circuit and the sampling circuit and is used for receiving the sampling signal and adjusting the working state of the switch enable signal according to the sampling signal. According to the utility model, the reliability of the energy storage inverter system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to auxiliary power supply technical field, concretely relates to an auxiliary power supply circuit, auxiliary power supply device and energy storage equipment. BACKGROUND

[0002] The auxiliary power supply in the energy storage grid-connected inverter system is mainly used for supplying power for the control circuit and other low-voltage components inside the inverter, providing stable power supply for the control unit, microprocessor and signal processing circuit of the inverter, providing driving voltage for power switch devices such as IGBT or MOSFET, supporting voltage and current monitoring circuit to ensure safe operation of the equipment, and providing overvoltage, undervoltage and short circuit protection functions. Generally, the auxiliary power supply in the energy storage grid-connected inverter system is designed as a high-efficiency switching power supply to reduce energy loss and improve the overall efficiency of the system. The requirements of the auxiliary power supply in the energy storage grid-connected inverter system are: stable output, continuous and stable power supply within a wide input voltage range to ensure reliable operation of the system; electrical isolation between input and output to improve safety and reduce interference; adapt to different input voltage ranges to adapt to various grid environments and energy storage system configurations. In the energy storage grid-connected inverter system, the auxiliary power supply is one of the key components to ensure normal operation of the equipment, which supports the control and monitoring functions of the inverter by providing necessary auxiliary power.

[0003] However, the existing auxiliary power supply in the energy storage grid-connected inverter system also has some disadvantages in design and application. The auxiliary power supply in the grid-connected inverter is usually controlled by an analog control chip, and the common solution is flyback. When the energy storage grid-connected inverter system has an overvoltage fault, the control chip in the auxiliary power supply cannot respond in time, causing the auxiliary power supply to output a large voltage to the energy storage grid-connected inverter, so that the energy storage grid-connected inverter receives a large voltage, thereby causing the risk of damage to the energy storage grid-connected inverter. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of auxiliary power supply circuit, auxiliary power supply device and energy storage equipment to solve above-mentioned problems.

[0005] The utility model realizes by the following technical scheme:

[0006] An auxiliary power supply circuit comprises:

[0007] A voltage conversion circuit is used to receive an input voltage signal and perform voltage conversion processing on the input voltage signal to generate a power supply signal.

[0008] The driving circuit is connected with the voltage conversion circuit and the master control circuit, used for receiving the switch enable signal sent by the master control circuit, and generating a switch driving signal according to the switch enable signal and sending it to the voltage conversion circuit; the voltage conversion circuit is also used for controlling the voltage of the power supply signal according to the switch driving signal.

[0009] The sampling circuit is connected with the output end of the voltage conversion circuit, used for sampling the output end of the voltage conversion circuit to generate a sampling signal.

[0010] The master control circuit is connected with the driving circuit and the sampling circuit, used for receiving the sampling signal and adjusting the working state of the switch enable signal according to the sampling signal.

[0011] As an optimization, the voltage conversion circuit comprises:

[0012] The primary full-bridge unit is used for receiving the input voltage signal and inverting the input voltage signal to generate a first alternating current signal.

[0013] The secondary full-bridge unit is connected with the primary full-bridge unit, used for receiving the first alternating current signal and performing voltage conversion processing on the first alternating current signal to generate the power supply signal.

[0014] As an optimization, the driving circuit comprises:

[0015] The primary driving unit is connected with the master control circuit and the primary full-bridge unit, used for generating a first driving signal and a second driving signal to drive the primary full-bridge unit.

[0016] The secondary driving unit is connected with the master control circuit and the secondary full-bridge unit, used for generating a third driving signal and a fourth driving signal to drive the secondary full-bridge unit.

[0017] As optimization, the primary side full-bridge unit comprises field effect tube Q1, field effect tube Q2, field effect tube Q3, field effect tube Q4, resistance R2, resistance R4, resistance R6 and resistance R8, wherein the gates of the field effect tube Q1, the field effect tube Q2, the field effect tube Q3 and the field effect tube Q4 are connected with the primary side and secondary side driving unit respectively, the source of the field effect tube Q1 is connected with the drain of the field effect tube Q2 and the first end of the primary coil of the transformer T2 respectively, a temperature sensor is installed on the transformer T2, the temperature sensor is connected with the main control unit, the source of the field effect tube Q3 is connected with the drain of the field effect tube Q4 and the second end of the primary coil of the transformer T2 respectively, the drains of the field effect tube Q1 and the field effect tube Q3 are connected with the input end +VBUS, the drains of the field effect tube Q2 and the field effect tube Q4 are grounded, the resistance R8 is arranged between the source and the base of the field effect tube Q1, the resistance R6 is arranged between the source and the base of the field effect tube Q2, the resistance R4 is arranged between the source and the base of the field effect tube Q3, and the resistance R2 is arranged between the source and the base of the field effect tube Q4.

[0018] As optimization, the secondary side full-bridge unit comprises field effect tube Q5, field effect tube Q6, field effect tube Q7, field effect tube Q8, resistance R9, resistance R10, resistance R11, resistance R15, capacitor C11, capacitor C12, capacitor C13 and capacitor C14; wherein the gates of the field effect tube Q5, the field effect tube Q6, the field effect tube Q7 and the field effect tube Q8 are connected with the primary side and secondary side driving unit respectively, the source of the field effect tube Q5 is connected with the source of the field effect tube Q7 and the first end of the secondary coil of the transformer T2 respectively, the source of the field effect tube Q6 is connected with the source of the field effect tube Q8 and the second end of the secondary coil of the transformer T2 respectively, the drains of the field effect tube Q5 and the field effect tube Q6 are connected, the drains of the field effect tube Q7 and the field effect tube Q8 are connected, the resistance R9 is arranged between the source and the base of the field effect tube Q5, the resistance R10 is arranged between the source and the base of the field effect tube Q7, the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are arranged in parallel, the first end of the capacitor C11 is connected with the drain of the field effect tube Q6, the second end of the capacitor C11 is connected with the common connection end of the resistance R15 and the resistance R5, the two ends of the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are respectively used as the positive voltage output end and the negative voltage output end of the voltage conversion circuit output power supply signal, and the positive voltage output end and the negative voltage output end are respectively connected with the sampling circuit.

[0019] As optimization, the primary side driving unit comprises a chip U1, a chip U2 and a chip U4, a first power supply pin and a second power supply pin of the chip U1 are connected with the power supply circuit respectively, a first power supply pin of the chip U4 is also grounded through a series capacitor C22, a second power supply pin of the chip U4 is also grounded through a series capacitor C21, a first ground pin and a second ground pin of the chip U4 are grounded, a first enable pin and a second enable pin of the chip U4 are connected with the master control circuit respectively, a first output pin of the chip U4 is connected with a high level valid pin of the chip U1 and a low level valid pin of the chip U2 respectively, and a second output pin of the chip U4 is connected with a low level valid pin of the chip U1 and a high level valid pin of the chip U2 respectively.

[0020] A working voltage pin of the chip U1 and a working voltage pin of the chip U2 are connected with the power supply circuit respectively, the working voltage pin of the chip U1 is grounded through a series capacitor C8, the working voltage pin of the chip U2 is grounded through a series capacitor C9, a high side driving pin, a high end output pin and a low end output pin of the chip U1 are connected with a source electrode, a base electrode of the field effect transistor Q1 and a base electrode of the field effect transistor Q2 respectively, an output end of the high side driving pin of the chip U1 is connected with a capacitor C7 in series, a high side driving pin, a high end output pin and a low end output pin of the chip U2 are connected with a source electrode, a base electrode of the field effect transistor Q3 and a base electrode of the field effect transistor Q4 respectively, an output end of the high side driving pin of the chip U2 is connected with a capacitor C10 in series, and a common ground end voltage pin and a heat dissipation ground pin of the chip U1 and the chip U2 are grounded.

[0021] As optimization, the secondary side driving unit comprises a chip U3, a first enable pin and a second enable pin of the chip U3 are connected with the master control circuit respectively, a working voltage pin of the chip U3 is connected with the power supply circuit, the working voltage pin of the chip U3 is also grounded through a series capacitor C19, a first output pin of the chip U3 is connected with a base electrode of the field effect transistor Q5 and a base electrode of the field effect transistor Q8 respectively, and a second output pin of the chip U3 is connected with a base electrode of the field effect transistor Q7 and a base electrode of the field effect transistor Q6 respectively.

[0022] As optimization, the sampling circuit comprises resistors R3, R5, a capacitor C6, a resistor R7, a resistor R24, a capacitor C34, a capacitor C37, a resistor R11, a resistor R40 and a comparator U5, first ends of the resistors R3 and R5 are connected with a drain of the field effect transistor Q8, a second end of the resistor R3 is connected with an inverting input end of the comparator U5, the second end of the resistor R3 is also connected with a non-inverting input end of the comparator U5 through the capacitor C6 in series, a second end of the resistor R15 is connected with the non-inverting input end of the comparator U5 through the resistor R5 in series, the second end of the resistor R15 is grounded through the resistor R24 in series, meanwhile, common connection ends of the resistors R15 and R24 are grounded, an output end of the comparator U5 is used as a current output end of the voltage reduction circuit, and a parallel link formed by the resistor R7 and the capacitor C34 is connected between the output end of the comparator U5 and the inverting input end of the comparator U5, a positive power supply end of the comparator U5 is grounded, and a negative power supply end of the comparator U5 is grounded through the capacitor C37 in series.

[0023] The application further discloses an auxiliary power supply device comprising the auxiliary power supply circuit.

[0024] The application further discloses an energy storage device comprising the auxiliary power supply device.

[0025] Compared with the prior art, the application has the following advantages and beneficial effects:

[0026] The auxiliary power supply circuit adjusts the output voltage of the voltage conversion circuit by adjusting the switching driving signal output by the driving circuit, so that the output of the auxiliary power supply device (also referred to as an auxiliary power supply) is kept stable, thereby improving the reliability of the energy storage inverter system. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate embodiments of the application and are used to explain the application. In the drawings:

[0028] Figure 1 The auxiliary power supply circuit provided in the application Figure 1 ;

[0029] Figure 2A specific circuit diagram of an auxiliary power supply circuit provided for an embodiment of the present application is provided.

[0030] Figure 3 A specific circuit diagram of a main control circuit provided for an embodiment of the present application is provided.

[0031] Figure 4 A specific circuit diagram of a primary side driving unit provided for an embodiment of the present application is provided.

[0032] Figure 5 A specific circuit diagram of a secondary side driving unit provided for an embodiment of the present application is provided.

[0033] Markings in the drawings and corresponding names of parts:

[0034] 1-voltage conversion circuit, 2-driving circuit, 3-sampling circuit, 4-main control circuit, 5-power supply circuit, 6-energy storage inverter. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application more clear, specific embodiments and drawings are used to make a further detailed description of the present application, the schematic embodiments and the description thereof are used to explain the present application, and are not used to limit the present application.

[0036] The present embodiment 1 provides an auxiliary power supply circuit, as shown in the figure, the auxiliary power supply circuit comprises: a voltage conversion circuit 1, a driving circuit 2, a sampling circuit 3 and a main control circuit 4. Figure 1

[0037] Specifically, the voltage conversion circuit 1 is used to receive an input voltage signal and perform voltage conversion processing on the input voltage signal to generate a power supply signal; the driving circuit 2 is connected with the voltage conversion circuit 1 and the main control circuit 4, and is used to receive a switch enable signal sent by the main control circuit 4 and generate a switch driving signal according to the switch enable signal, and send the switch driving signal to the voltage conversion circuit 1; the voltage conversion circuit 1 is further used to control the voltage of the power supply signal according to the switch driving signal; the driving circuit 2 amplifies the switch enable signal (DPWM0A, DPWM1A wave introduced later) and outputs it to the voltage conversion circuit 1 to drive the voltage conversion circuit 1 to output the power supply signal to the energy storage grid-connected inverter.

[0038] The sampling circuit 3 is connected with the output end of the voltage conversion circuit 1, and is used to sample the output end of the voltage conversion circuit 1 to generate a sampling signal.

[0039] The main control circuit 4 is connected with the driving circuit 2 and the sampling circuit 3, and is used to receive the sampling signal and adjust the working state of the switch enable signal according to the sampling signal.

[0040] ​When the voltage of the sampling signal becomes large or the current becomes large, the main control circuit determines that overvoltage or overcurrent occurs at the output end of the voltage conversion circuit, at this time, the voltage of the switch enable signal output by the adjustment main control chip in the main control circuit is adjusted, thereby adjusting the duty cycle of the field effect tube in the voltage conversion circuit, and then the output duty cycle of the field effect tube is reduced, and then the proportion of the voltage +VBUS at the input end converted into the switch driving signal is reduced, so that the switch driving signal remains stable.

[0041] In one embodiment, the main control circuit is powered by a separate power supply circuit and is sampled in real time. When the power grid returns to normal, the output duty cycle of the field effect tube is still small at the previous sampling point, and the voltage or current of the sampling signal becomes small. When the voltage of the sampling signal becomes small or the current becomes small, the main control circuit determines that the input end +VBUS returns to normal, the voltage of the switch enable signal output by the main control chip in the main control circuit becomes high, thereby the voltage of the switch driving signal becomes large, the gate voltage of the field effect tube in the voltage conversion circuit becomes large, the output duty cycle of the field effect tube becomes large, and then the proportion of the voltage +VBUS at the input end converted into the switch driving signal becomes large, so as to improve the voltage and current value of the switch driving signal. In the technical solution, the voltage conversion circuit 1 is used to receive the processed power grid voltage, and the processed power grid voltage is converted to generate a power supply signal, and then the power supply signal is output to the energy storage grid-connected inverter;

[0042] Since the energy storage grid-connected inverter system also receives the power grid voltage, when the energy storage grid-connected inverter system has an overvoltage fault, the processed power grid voltage received by the voltage conversion circuit 1 will also become large, thereby causing the power supply signal to become large. After the sampling circuit 3 samples the large sampling signal of the power supply signal and sends it to the main control circuit 4, the main control circuit 4 will timely adjust the working state of the switch enable signal and send the changed switch enable signal to the driving circuit 2, thereby changing the switch driving signal of the driving circuit 2, and then making the voltage of the power supply signal generated by the voltage conversion circuit tend to the preset value, meeting the requirements.

[0043] In this embodiment, by setting the sampling circuit to sample the output end of the voltage conversion circuit in real time, when the output power supply signal of the voltage conversion circuit does not meet the requirements, the duty cycle of the switch tube in the voltage conversion circuit is adjusted in time through the main control circuit, so that the voltage of the power supply signal generated by the voltage conversion circuit tends to the preset value (for example, the voltage of the power supply signal is set to 12V), meeting the requirements.

[0044] In one embodiment, the driving circuit 2 amplifies the switch enable control signal (DPWM0A, DPWM1A wave introduced later) to generate a switch driving signal output to the voltage conversion circuit 1 to drive the voltage conversion output current to the energy storage inverter 6. Next, the structure of the utility model is introduced in detail.

[0045] In some embodiments, the voltage conversion circuit includes a primary full-bridge unit and a secondary full-bridge unit.

[0046] Specifically, the primary full-bridge unit is used to receive an input voltage signal and perform inverter processing on the input voltage signal to generate a first alternating current signal; the secondary full-bridge unit is connected with the primary full-bridge unit and is used to receive the first alternating current signal and perform voltage conversion processing on the first alternating current signal to generate a power supply signal.

[0047] As shown in Figure 2 The primary full-bridge unit includes field effect tube Q1, field effect tube Q2, field effect tube Q3, field effect tube Q4, resistor R2, resistor R4, resistor R6 and resistor R8, wherein the gates of the field effect tube Q1, field effect tube Q2, field effect tube Q3 and field effect tube Q4 are connected with the primary and secondary driving units respectively, the source of the field effect tube Q1 is connected with the drain of the field effect tube Q2 and the first end of the primary coil of the transformer T2 respectively, the source of the field effect tube Q3 is connected with the drain of the field effect tube Q4 and the second end of the primary coil of the transformer T2 respectively, the drains of the field effect tube Q1 and field effect tube Q3 are connected with the input terminal +VBUS, the drains of the field effect tube Q2 and field effect tube Q4 are grounded, and the resistor R8 is arranged between the source and the base of the field effect tube Q1, the resistor R6 is arranged between the source and the base of the field effect tube Q2, the resistor R4 is arranged between the source and the base of the field effect tube Q3, and the resistor R2 is arranged between the source and the base of the field effect tube Q4.

[0048] The auxiliary power supply primary side full-bridge unit includes field effect tube Q5, field effect tube Q6, field effect tube Q7, field effect tube Q8, resistor R9, resistor R10, resistor R11, resistor R15, capacitor C11, capacitor C12, capacitor C13, and capacitor C14. The gates of the field effect tube Q5, the field effect tube Q6, the field effect tube Q7, and the field effect tube Q8 are respectively connected to the primary side driving unit and the auxiliary side driving unit. The source of the field effect tube Q5 is connected to the source of the field effect tube Q7 and the first end of the secondary coil of the transformer T2. The source of the field effect tube Q6 is connected to the source of the field effect tube Q8 and the second end of the secondary coil of the transformer T2. The drains of the field effect tube Q5 and the field effect tube Q6 are connected. The drains of the field effect tube Q7 and the field effect tube Q8 are connected. The resistor R9 is arranged between the source and the base of the field effect tube Q5. The resistor R10 is arranged between the source and the base of the field effect tube Q7. The capacitor C11, the capacitor C12, the capacitor C13, and the capacitor C14 are arranged in parallel. The first end of the capacitor C11 is connected to the drain of the field effect tube Q6. The second end of the capacitor C11 is connected to the common connection end of the resistor R15 and the resistor R5. The two ends of the capacitor C11, the capacitor C12, the capacitor C13, and the capacitor C14 are respectively used as the positive voltage output end and the negative voltage output end of the voltage conversion circuit output power supply signal. The positive voltage output end and the negative voltage output end are respectively connected to the sampling circuit.

[0049] In the embodiment, the auxiliary power supply main circuit (i.e., the voltage conversion circuit) adopts a hard-switching full-bridge circuit. By setting the sizes of the circuit components, the hard-switching full-bridge circuit in the embodiment can have an input power supply of 16V-80V and an output of 12V, and the output power can reach 120W, thereby supplying power to the driving power supply chip and the main power supply control chip in the energy storage grid-connected inverter system (or referred to as the energy storage grid-connected inverter or the PCS or the energy storage inverter).

[0050] Continuing to refer to Figure 2 As shown in the figure, +VBUS is used as the input of the auxiliary power supply main circuit, +VBUS is the voltage at VIN+ obtained by rectifying and step-down processing of the grid voltage, VIN+ is processed to obtain +VBUS, HO1, HO2, HS1, HS2, LO1, and LO2 are used as the primary side driving control signals (the first driving signal includes HO1, HO2, and HS1, and the second driving signal includes HS2, LO1, and LO2, and HS1 and HS2 are used to control the corresponding reference potential), to control the working state of the primary side of the auxiliary power supply main power supply; OUTA (the third driving signal) and OUTB (the fourth driving signal) are used as the secondary side driving control signals, to control the working state of the secondary side, and after processing by the auxiliary power supply main circuit, 12V power supply voltage is output to the control chip of the energy storage inverter through the port VOUT+ to supply power to the control chip of the PCS, and to start the energy storage inverter to work.

[0051] In some embodiments, the driving circuit comprises a primary side driving unit and a secondary side driving unit.

[0052] As shown in Figure 4 , the primary side driving unit comprises chip U1, chip U2 and chip U4, the first power supply pin VCC1 and the second power supply pin VCC2 of chip U1 are connected with the power supply circuit respectively, the first power supply pin VCC1 of chip U4 is also grounded through a series capacitor C22, the second power supply pin VCC2 of chip U4 is also grounded through a series capacitor C21, the first ground pin GND1 and the second ground pin GND2 of chip U4 are grounded, the first enable pin INA and the second enable pin INB of chip U4 are connected with the master control circuit respectively, the first output pin OUTA of chip U4 is connected with the high level effective pin HI of chip U1 and the low level effective pin LI of chip U2 respectively, and the second output pin OUTB of chip U4 is connected with the low level effective pin LI of chip U1 and the high level effective pin HI of chip U2 respectively.

[0053] The working voltage pin VDD of chip U1 and the working voltage pin VDD of chip U2 are connected with the power supply circuit respectively, the working voltage pin VDD of chip U1 is grounded through a series capacitor C8, the working voltage pin VDD of chip U2 is grounded through a series capacitor C9, the high side driving pin HB, the high end output pin HO and the low end output pin LO of chip U1 are connected with the source electrode, the base electrode of field effect transistor Q1 and the base electrode of field effect transistor Q2 respectively, the output end of the HB pin of chip U1 is connected with a capacitor C7 in series, the high side driving pin HB, the high end output pin HO and the low end output pin LO of chip U2 are connected with the source electrode, the base electrode of field effect transistor Q3 and the base electrode of field effect transistor Q4 respectively, the output end of the HB pin of chip U2 is connected with a capacitor C10 in series, and the common ground end voltage pin VSS and the heat dissipation ground pin PWPD of chip U1 and chip U2 are grounded.

[0054] As shown in Figure 5 , the secondary side driving unit comprises chip U3, the first enable pin INA and the second enable pin INB of chip U3 are connected with the master control circuit respectively, the working voltage pin VDD of chip U3 is connected with the power supply circuit, the working voltage pin VDD of chip U3 is also grounded through a series capacitor C19, the first output pin OUTA of chip U3 is connected with the base electrode of field effect transistor Q5 and the base electrode of field effect transistor Q8 respectively, and the second output pin OUTB of chip U3 is connected with the base electrode of field effect transistor Q7 and the base electrode of field effect transistor Q6 respectively.

[0055] The integrated drive chip has high reliability, amplifies the weak signal generated by the control chip to be enough to drive the high-power device, converts the voltage or current level of the control chip to adapt to different subsequent circuits, and provides electrical isolation of the signal to protect the control system (control chip, i.e. chip U6) from high voltage and noise interference.

[0056] Specifically, the DPWM0A and DPWM1A waves (switching enable signals) output by the main control chip U6 of the auxiliary power supply control the outputs HO1, HS1, L01, HO2, HS2 and LO2, and further control the working state of the primary side full-bridge unit. Similarly, the DPWM0B and DPWM1B waves (switching enable signals) output by the main control chip U6 in the main control unit control the outputs OUTA and OUTB, and further control the working state of the secondary side full-bridge circuit.

[0057] In some embodiments, the sampling circuit includes resistors R3, R5, capacitor C6, resistor R7, resistor R24, capacitor C34, capacitor C37, resistor R11, resistor R40 and comparator U5, the first ends of resistors R3 and R5 are connected to the drain of field effect transistor Q8, the second end of resistor R3 is connected to the inverting input terminal of comparator U5, the second end of resistor R3 is also connected to the non-inverting input terminal of comparator U5 through capacitor C6 in series, the second end of resistor R15 is connected to the non-inverting input terminal of comparator U5 through resistor R5 in series, the second end of resistor R15 is grounded through resistor R24 in series, at the same time, the common connection end of resistor R15 and resistor R24 is grounded, the output terminal of comparator U5 is the current output terminal of the voltage reduction circuit, and there is a parallel link formed by resistor R7 and capacitor C34 connected between the output terminal of comparator U5 and the inverting input terminal of comparator U5, the positive power supply terminal of comparator U5 is grounded, and the negative power supply terminal of comparator U5 is grounded through capacitor C37 in series.

[0058] Here, the sampling circuit mainly samples the output current and output voltage in the voltage conversion circuit.

[0059] In some embodiments, as Figure 3As shown, the main control circuit includes chip U6, the EAP1 pin of chip U6 is connected with the output end of comparator U5 through series resistance R41, the EAN1 pin of chip U6 is connected with one end of resistance R41 close to the EAP1 pin of chip U6 through series capacitor C24, the EAN0 pin of chip U6 is connected with one end of resistance R40 away from resistance R24, the EAP0 pin of chip U6 is connected with one end of resistance away from capacitor C14 through series resistance R21, the first PWM signal output pin DPWM0A and the second PWM signal output pin DPWM1A of chip U6 are connected with the second enable pin INB and the first enable pin INA of chip U4 respectively, the third PWM signal output pin DPWM0B and the fourth PWM signal output pin DPWM1B of chip U6 are connected with the first enable pin INA and the second enable pin INB of chip U3 respectively, the third analog input pin AD03 and the thirteenth analog input pin AD13 of chip U6 are connected with the voltage sensor and the current sensor for collecting the voltage and current of the energy storage grid-connected inverter, the first direct current power supply pin V33D and the first alternating current power supply pin V33A of chip U6 are connected with the power supply circuit, and the reset pin RESET of chip U6 is connected with the power supply circuit through series resistance R38.

[0060] In another embodiment, the sixth analog input pin AD06 of chip U6 is connected with the temperature sensor installed on transformer T2, and the fourth analog input pin AD04 of chip U6 is connected with the temperature sensor installed in the energy storage grid-connected inverter. At the same time, when the temperature sensor is arranged on the transformer, the sampling circuit also includes the temperature sensor. The specific position of the temperature sensor arranged on the transformer can be determined according to the actual situation, which is a prior art and will not be described here.

[0061] When any one of the three values (the sampled voltage, current and temperature) exceeds the preset value, the main control chip adjusts the output duty cycle of the field effect tube in the primary full-bridge circuit and the secondary full-bridge circuit of the auxiliary power supply main circuit by controlling the state of the first switch enable signal DPWM0A and the second switch enable signal DPWM1A, and then adjusts the output of the voltage conversion circuit, so that the received voltage of the energy storage inverter is stable.

[0062] In another embodiment, there is another sampling method, the thirteenth analog input pin AD13 of chip U6 samples the current of PCS, the third analog input pin AD03 of chip U6 samples the voltage of the energy storage inverter, and the fourth analog input pin AD04 of chip U6 samples the temperature of the energy storage inverter.

[0063] Similarly, the thirteenth analog input pin AD13 of the chip U6 samples the current of the energy storage inverter, the third analog input pin AD03 of the chip U6 samples the voltage of the energy storage inverter, and the fourth analog input pin AD04 of the chip U6 samples the temperature of the energy storage inverter.

[0064] When any one of the three values exceeds the preset value, the state of the auxiliary power supply main circuit can also be adjusted by controlling the on-off signals DPWM0A and DPWM1A, the output duty cycles of the field effect tubes of the primary side full-bridge circuit and the secondary side full-bridge circuit of the auxiliary power supply main circuit are adjusted, and then the received voltage of the auxiliary power supply is kept stable.

[0065] Specifically, referring to Fig. 1, Figure 3 RS+ and RS- of the chip U6 are used to sample the voltage at the output end of the auxiliary power supply main circuit, i.e., the voltage output at the voltage output end of the voltage conversion circuit, IOUT of the chip U6 is used to sample the current at the output end of the auxiliary power supply main circuit, i.e., the current output at the current output end of the voltage conversion circuit, and temp1 (AD06 pin) of the chip U6 is used to sample the temperature of the transformer T2. Figure 1 Figure 2 Figure 2

[0066] It should be noted that the first threshold value, the second threshold value, and the third threshold value are set according to actual conditions, and the cut-off value can also be set according to actual conditions, which is not the focus of protection of the present application. The model of the chip U6 is UCD3138.

[0067] The chip is a digital power supply controller produced by Texas Instruments, which is widely used in high-performance power management applications. It supports adaptive digital control algorithm, improves system stability and response speed. It has built-in rich protection mechanism to prevent overcurrent, overvoltage and overheating failures. On the one hand, the control chip collects the voltage and current signals of the auxiliary power supply main circuit, and on the other hand, it collects the voltage, current and temperature signals in the energy storage grid-connected inverter system, and communicates with the main DSP of the energy storage grid-connected inverter system through SCI to exchange data. In some embodiments, the driving circuit and the main control circuit are powered by an independent power supply circuit 5. The model of the power supply circuit is UCC25230. Specifically, the power supply circuit mainly supplies power to the chips U1, U2, U3 and U6 in the following content. However, the working voltages of the chips U1, U2, U3 and U6 are different, so the power supply circuit needs to output different voltages to meet the power supply requirements of the chips U1, U2, U3 and U6. The buck circuit is a prior art, and the actual output voltage can be adjusted according to the size of the circuit components in the buck circuit. Therefore, the specific circuit of the power supply circuit will not be described here.

[0068] ​​​It also needs to be explained that the utility model protects the circuit connection structure of the driving unit, the voltage conversion circuit, the main control circuit and the sampling circuit, therefore the setting of parameters is not described again.

[0069] The above detailed description of the utility model has further detailed the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above is only the specific implementation of the utility model and is not used to limit the protection scope of the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An auxiliary power supply circuit, characterized by comprising: The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit.

2. An auxiliary power supply circuit according to claim 1, characterized in that The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit.

3. An auxiliary power supply circuit according to claim 2, wherein The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit.

4. An auxiliary power supply circuit according to claim 3, characterized in that The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit.

5. An auxiliary power supply circuit according to claim 3, wherein The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application relates to a voltage conversion circuit, a driving circuit, a sampling circuit and a main control circuit. The application The gate of the field effect tube Q5, the gate of the field effect tube Q6, the gate of the field effect tube Q7, and the gate of the field effect tube Q8 are connected with the secondary side driving unit respectively, the source of the field effect tube Q5 is connected with the source of the field effect tube Q7 and the first end of the secondary coil of the transformer T2 respectively, the source of the field effect tube Q6 is connected with the source of the field effect tube Q8 and the second end of the secondary coil of the transformer T2 respectively, the drain of the field effect tube Q5 and the drain of the field effect tube Q6 are connected, the drain of the field effect tube Q7 and the drain of the field effect tube Q8 are connected, the resistor R9 is arranged between the source and the base of the field effect tube Q5, the resistor R10 is arranged between the source and the base of the field effect tube Q7, the capacitor C11, the capacitor C12, the capacitor C13, and the capacitor C14 are arranged in parallel, the first end of the capacitor C11 is connected with the drain of the field effect tube Q6, the second end of the capacitor C11 is connected with the common connection end of the resistor R15 and the resistor R5, the two ends of the capacitor C11, the capacitor C12, the capacitor C13, and the capacitor C14 are respectively used as the positive voltage output end and the negative voltage output end of the voltage conversion circuit output power supply signal, and the positive voltage output end and the negative voltage output end are respectively connected with the sampling circuit.

6. An auxiliary power supply circuit according to claim 4, wherein The primary side driving unit comprises a chip U1, a chip U2, and a chip U4, the first power supply pin and the second power supply pin of the chip U1 are connected with the power supply circuit respectively, the first power supply pin of the chip U4 is further connected with the ground through a series capacitor C22, the second power supply pin of the chip U4 is further connected with the ground through a series capacitor C21, the first ground pin and the second ground pin of the chip U4 are grounded, the first enable pin and the second enable pin of the chip U4 are connected with the master control circuit respectively, the first output pin of the chip U4 is connected with the high level effective pin of the chip U1 and the low level effective pin of the chip U2 respectively, and the second output pin of the chip U4 is connected with the low level effective pin of the chip U1 and the high level effective pin of the chip U2 respectively. The working voltage pin of the chip U1 and the working voltage pin of the chip U2 are connected with the power supply circuit respectively, the working voltage pin of the chip U1 is connected with the ground through a series capacitor C8, the working voltage pin of the chip U2 is connected with the ground through a series capacitor C9, the high side driving pin, the high end output pin, and the low end output pin of the chip U1 are connected with the source, the base of the field effect tube Q1, and the base of the field effect tube Q2 respectively, the output end of the high side driving pin of the chip U1 is connected with a capacitor C7 in series, the high side driving pin, the high end output pin, and the low end output pin of the chip U2 are connected with the source, the base of the field effect tube Q3, and the base of the field effect tube Q4 respectively, the output end of the high side driving pin of the chip U2 is connected with a capacitor C10 in series, and the common ground voltage pin and the heat dissipation ground pin of the chip U1 and the chip U2 are grounded.

7. An auxiliary power supply circuit according to claim 5, wherein The auxiliary side driving unit comprises a chip U3, the first and second enable pins of the chip U3 are connected with the master control circuit respectively, the working voltage pin of the chip U3 is connected with the power supply circuit, the working voltage pin of the chip U3 is also grounded through a series capacitor C19, the first output pin of the chip U3 is connected with the base of the field effect tube Q5 and the base of the field effect tube Q8 respectively, and the second output pin of the chip U3 is connected with the base of the field effect tube Q7 and the base of the field effect tube Q6 respectively.

8. An auxiliary power supply circuit according to any one of claims 1-7, characterized in that, The sampling circuit comprises resistors R3, R5, C6, R7, R24, C34, C37, R11, R40 and a comparator U5; wherein, the first ends of the resistors R3 and R5 are connected with the drain of the field effect tube Q8, the second end of the resistor R3 is connected with the inverting input terminal of the comparator U5, the second end of the resistor R3 is also connected with the non-inverting input terminal of the comparator U5 through a series capacitor C6, the second end of the resistor R15 is connected with the non-inverting input terminal of the comparator U5 through a series resistor R5, the second end of the resistor R15 is grounded through a series resistor R24, meanwhile, the common connection end of the resistors R15 and R24 is grounded, the output terminal of the comparator U5 is used as the current output terminal of the voltage reduction circuit, and a parallel link formed by the resistor R7 and the capacitor C34 is connected between the output terminal of the comparator U5 and the inverting input terminal of the comparator U5, the positive power supply terminal of the comparator U5 is grounded, and the negative power supply terminal of the comparator U5 is grounded through a series capacitor C37.

9. An auxiliary power supply device characterized by comprising: The auxiliary power supply circuit as claimed in any one of claims 1-8.

10. An energy storage device, characterized by, The auxiliary power supply device as claimed in claim 9.

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