Energy storage converter

Abstract

The invention discloses an energy storage converter, which comprises a bidirectional conversion circuit and a first control circuit for controlling the bidirectional conversion circuit, and further comprises an auxiliary power supply module, the auxiliary power supply module supplies power to the first control circuit, the auxiliary power supply module comprises a rectification circuit unit, and an alternating current end of the rectification circuit unit is electrically connected to an alternating current source; the power supply conversion unit comprises an input port and an output port, the input port is electrically connected to the direct current port of the rectification circuit unit, the input port is coupled with a direct current source, and the output port is electrically connected with the first control circuit; the power supply conversion unit is configured to convert the voltage of at least one of the alternating current source and the direct current source into the voltage matched with the first control circuit; and the power supply selection unit is arranged between the input port of the power supply conversion unit and the direct current source and is used for controlling connection and disconnection between the input port and the direct current source. Power supply of the alternating current source and the direct current source to the first control circuit can be regulated, waste of electric energy of the direct current source is avoided, and standby power consumption of the direct current source is reduced.

Description

Technical Field

[0001] The present application relates to the field of electric power supply regulation, and in particular to an energy storage converter. Background Art

[0002] In the prior art, the auxiliary power supply of the energy storage converter adopts a dual power supply architecture, using both DC and AC power supplies for power supply. Although this design can provide stable power support, it lacks an effective auxiliary power management mechanism.

[0003] Specifically, when the auxiliary power supply is provided by an AC source, the auxiliary power supply circuit will continue to consume DC source power. When the energy storage inverter needs DC source power supply, the DC source power has been reduced due to standby consumption, which not only reduces the efficiency of the energy storage inverter, but also increases energy loss, affecting the overall performance and reliability of the energy storage inverter.

[0004] Therefore, how to improve the auxiliary power management mechanism of the energy storage inverter, reduce the power loss of the DC source when the AC source is powered, and improve the energy utilization efficiency of the energy storage inverter is also a technical problem that needs to be solved at present. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, this application adopts the following technical solutions: The present application provides an energy storage converter, the energy storage converter includes a bidirectional conversion circuit and a first control circuit at least for controlling the bidirectional conversion circuit, the energy storage converter also includes an auxiliary power supply module, the auxiliary power supply module is at least used to supply power to the first control circuit, and the auxiliary power supply module includes: A rectifier circuit unit, wherein an AC end of the rectifier circuit unit is electrically connected to an AC source; A power conversion unit, the power conversion unit includes an input port and an output port, the input port is electrically connected to the DC port of the rectifier circuit unit, and the input port is coupled to the DC source, the output port is used to be electrically connected to the first control circuit, and the power conversion unit is configured to convert a voltage of at least one of the AC source and the DC source into a voltage matching the first control circuit; The power selection unit is arranged between the input port of the power conversion unit and the DC source, and is used to control the on-off between the input port and the DC source.

[0006] According to the above description, the present application provides an energy storage inverter, which adjusts the power supply of the AC source and the DC source to the first control circuit by setting an auxiliary power supply module for controlling the bidirectional conversion circuit, so that when the AC source is normal, the AC source supplies power to the power conversion unit, and at the same time cuts off the power supply of the DC source, thereby reducing the power loss of the DC source and improving the utilization efficiency of the DC source power; it also realizes that when the AC source is abnormal or disconnected, the DC source is switched to supply power to the power conversion unit, thereby improving the stability and reliability of the energy storage inverter.

[0007] Further, the power selection unit includes a first switch tube, a first end of the first switch tube is electrically connected to the input port of the power conversion unit; a second end of the first switch tube is electrically connected to the DC source; The energy storage converter further includes a control unit, which is electrically connected to a control end of the first switch tube, and is used to control the on and off of the first switch tube according to a state of the AC source.

[0008] Furthermore, when the state of the AC source is normal, the first switch tube is controlled to be disconnected, and the power supply of the power conversion unit comes from the AC source; When the state of the AC source is abnormal, the first switch tube is controlled to be closed, and the power supply of the power conversion unit comes from the DC source.

[0009] Furthermore, the power selection unit also includes a first resistor, a second resistor and a third resistor, the first switch tube is arranged between the first end of the DC source and the first input end of the power conversion unit, the control end of the first switch tube is electrically connected to the first end of the DC source through the third resistor, and the control end is electrically connected to the second end of the DC source through the first resistor and the second resistor.

[0010] Furthermore, the power selection unit also includes a capacitor and a Zener diode, the first end of the capacitor is electrically connected to the first end of the DC source, the second end of the capacitor is electrically connected to the connection node between the first resistor and the second resistor; the Zener diode is connected in parallel with the capacitor.

[0011] Furthermore, the first switch tube is an N-MOS; the first end of the first switch tube is the drain of the N-MOS; the second end of the first switch tube is the source of the N-MOS; the control end of the first switch tube is the gate of the N-MOS; the source is electrically connected to the negative end of the DC source, and the drain is electrically connected to the low potential port of the input port.

[0012] Furthermore, the first end of the DC source is a positive end of the DC source or a negative end of the DC source.

[0013] Furthermore, the energy storage converter also includes a control unit, which is electrically connected to the control end of the first switch tube, and is used to control the on and off of the first switch tube.

[0014] Furthermore, the control unit includes an optical coupler and a second switch tube, an input end of the optical coupler is electrically connected to the second switch tube, and the second switch tube is used to control the on and off of the input diode of the optical coupler; The first output end of the optical coupler is electrically connected to the control end of the first switch tube, and the second output end of the optical coupler is electrically connected to the first input end of the power conversion unit.

[0015] Furthermore, the energy storage converter further includes a sampling unit, which is used to collect the voltage of the AC source, and the sampling unit is coupled to the control end of the second switch tube.

[0016] Furthermore, the control unit includes a relay or a digital isolation chip, and the control end of the first switch tube is electrically connected to the first input end of the power conversion unit through the relay or the digital isolation chip; Alternatively, the power conversion unit includes a first flyback circuit and a second flyback circuit, an input port of the first flyback circuit is coupled to the AC source through the rectifier circuit unit, and the first flyback circuit is configured to convert a voltage of the AC source into a voltage matching the first control circuit; An input port of the second flyback circuit is coupled to the DC source, and the second flyback circuit is configured to convert a voltage of the DC source into a voltage matching the first control circuit.

[0017] Further, the power conversion unit includes a flyback circuit, and the flyback circuit is configured to convert the voltage of at least one of the AC source and the DC source into a voltage matching the first control circuit; The power selection circuit also includes a first diode and a second diode, the anode of the first diode is electrically connected to the positive end of the DC source, the cathode of the first diode is electrically connected to the positive input end of the flyback circuit, the anode of the second diode is electrically connected to the negative input end of the flyback circuit, and the cathode of the second diode is electrically connected to the negative end of the DC source. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of an energy storage converter provided in an embodiment of the present application; Figure 2 A circuit diagram of an energy storage converter provided in one embodiment of the present application; Figure 3 A circuit diagram of a control unit in an energy storage converter provided in an embodiment of the present application; Figure 4A circuit diagram of an energy storage converter provided in another embodiment of the present application; Figure 5 A schematic diagram of the connection between a first flyback circuit and a rectifier circuit unit in an energy storage converter provided in an embodiment of the present application; Figure 6 A schematic diagram of the connection between a second flyback circuit and a power selection unit in an energy storage converter provided in an embodiment of the present application; Figure 7 A connection diagram of a single flyback circuit in an energy storage converter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The present application will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings, but these embodiments do not limit the present application, and any structural, methodological, or functional changes made by a person of ordinary skill in the art based on these embodiments are included in the protection scope of the present application. (Electrical) connection includes direct (electrical) connection and indirect (electrical) connection.

[0020] In order to address the deficiencies in the prior art, the purpose of the present application is to provide an energy storage inverter, including a bidirectional conversion circuit and a first control circuit that can be used to control the bidirectional conversion circuit. In the energy storage inverter of the present application, an auxiliary power supply module configured to power the first control circuit is used to adjust the power supply of the AC source and the DC source to the first control circuit, so that the DC source is cut off when the AC source supplies power to the first control circuit, thereby reducing the power loss of the DC source and improving the energy utilization efficiency; it is also achieved that when the AC source is disconnected from supplying power to the first control circuit, the DC source is switched to supply power to the first control circuit, thereby improving the stability and reliability of the energy storage inverter.

[0021] like Figure 1 As shown, it shows an energy storage converter 100 provided by an embodiment of the present application, the energy storage converter 100 includes a bidirectional conversion circuit 11 and a first control circuit 12 at least for controlling the bidirectional conversion circuit 11, the energy storage converter 100 also includes an auxiliary power supply module 13, the auxiliary power supply module 13 is at least used to supply power to the first control circuit 12, and the auxiliary power supply module 13 includes: A rectifier circuit unit 131, wherein an AC end of the rectifier circuit unit 131 is electrically connected to an AC source 201; The power conversion unit 132 includes an input port and an output port. The input port is electrically connected to the DC port of the rectifier circuit unit 131, and the input port is coupled to the DC source 202. The output port is used to be electrically connected to the first control circuit 12. The power conversion unit 132 is configured to convert the voltage of at least one of the AC source 201 and the DC source 202 into a voltage that matches the first control circuit 12, and to supply power to the first control circuit 12; the matching voltage refers to the same voltage level; for example, the output voltages of the AC source and the DC source are both high voltage, and the voltage is generally greater than 200V; and the voltage that matches the first control circuit 12 is low voltage DC, generally 3.3-24V. Of course, in order to adapt the voltage of the first control circuit, a voltage stabilizing circuit or a voltage reducing circuit can also be set between the power conversion unit 132 and the first control circuit 12 to provide a stable power supply for the first control circuit.

[0022] The power selection unit 133 is disposed between the input port of the power conversion unit 132 and the DC source 202 , and is used to control the on / off between the input port and the DC source 202 .

[0023] Specifically, in the energy storage inverter 100 provided in the embodiment of the present application, the first control circuit 12 is used to control the bidirectional conversion circuit 11 to work, wherein the first control circuit 12 has at least two control modes. In the first control mode, the first control circuit 12 controls the bidirectional conversion circuit 11 to convert the direct current in the energy storage system into alternating current; in the second control mode, the first control circuit 12 controls the bidirectional conversion circuit 11 to convert the alternating current in the power grid into direct current.

[0024] Furthermore, the energy storage converter 100 provided in the embodiment of the present application also includes an auxiliary power module 13, which can be used to supply power to the first control circuit 12. Specifically, the auxiliary power module 13 can include: a rectifier circuit unit 131, a power conversion unit 132, and a power selection unit 133. Among them, the AC end of the rectifier circuit unit 131 is electrically connected to the AC source 201. In this embodiment, the AC source 201 can be a power grid. The rectifier circuit unit 131 obtains power from the AC source 201 to convert AC power into DC power, providing input for the subsequent voltage conversion of the power conversion unit 132.

[0025] Further, the power conversion unit 132 may include an input port and an output port, wherein the input port of the power conversion unit 132 is connected to the DC port of the rectifier circuit unit 131, and the input port of the power conversion unit 132 is also coupled to the DC source 202, and the output port of the power conversion unit 132 is connected to the first control circuit 12. The power conversion unit 132 may include a flyback circuit, through which the voltage from the AC source 201 or the DC source 202 is converted into a voltage matching the first control circuit 12, so as to supply power to the first control circuit 12.

[0026] Furthermore, a power selection unit 133 is provided between the input port of the power conversion unit 132 and the DC source 202. In the energy storage converter 100 of the embodiment of the present application, the power selection unit 133 is used to control the on-off between the input port of the power conversion unit 132 and the DC source 202, so as to realize that when the AC power supply normally supplies power to the power conversion unit 132, the DC source 202 cuts off the power supply to the power conversion unit 132, thereby reducing the power loss of the DC source 202; in addition, when the AC power supply to the power conversion unit 132 fails or is disconnected, the power selection unit 133 controls the DC source 202 to form a loop with the power conversion unit 132, and the DC source 202 can supply power to the power conversion unit 132, thereby ensuring the normal operation of the first control circuit 12 and improving the reliability and stability of the auxiliary power module 13.

[0027] According to the above description, the energy storage inverter 100 of the embodiment of the present application, by regulating the power supply of the AC source 201 and the DC source 202 to the power conversion unit 132, avoids the power loss caused by the DC source 202 not being disconnected when the AC source 201 supplies power to the power conversion unit 132, thereby achieving effective reduction of the power loss of the energy storage inverter 100 and improving the energy utilization rate.

[0028] As an optional implementation, in the energy storage inverter 100 of the embodiment of the present application, the power selection unit 133 includes a first switch tube, a first resistor, a second resistor and a third resistor. The first switch tube is arranged between the first end of the DC source 202 and the first input end of the power conversion unit 132. The control end of the first switch tube is electrically connected to the first end of the DC source 202 through the third resistor, and the control end is electrically connected to the second end of the DC source 202 through the first resistor and the second resistor.

[0029] Specifically, Figure 2As shown, the AC power supply is the power supply connected to the AC side of the energy storage converter 100, A, B, and C represent the three phases of the AC source 201, and the DC power supply is the power supply connected to the DC side of the energy storage converter 100, BAT+ represents the positive pole of the DC power, and BAT- represents the negative pole of the DC power. The input port of the power conversion unit 132 includes a first input terminal BUS- and a second input terminal BUS+.

[0030] In this embodiment, the negative electrode of the DC source 202 is defined as the first end of the DC source 202, and the positive electrode of the DC source 202 is defined as the second end of the DC source 202. The first switch tube Q1 is arranged between the DC source 202 and the input end of the power conversion unit 132, and the first switch tube Q1 is an N-MOS tube. The drain of the first switch tube Q1 is electrically connected to the first input end BUS- of the power conversion unit 132, and the source of the first switch tube Q1 is electrically connected to BAT-. In addition, the gate of the first switch tube Q1 is electrically connected to the negative electrode of the DC source 202 through the third resistor R3 as a control end, and at the same time, the control end of the first switch tube Q1 is also electrically connected to the positive electrode of the DC power through the first resistor R1 and the second resistor R2. When the gate-source voltage Vgs of the first switch tube Q1 reaches a preset threshold voltage, the first switch tube Q1 is turned on, and the DC source 202 can supply power to the power conversion unit 132; when the gate-source voltage Vgs of the first switch tube Q1 is less than the preset threshold voltage, the first switch tube Q1 is turned off, and the DC source 202 stops supplying power to the power conversion unit 132.

[0031] According to the above description, by setting the first switch tube, the power selection unit 133 can control the on and off of the power supply circuit of the DC source 202 to the power conversion unit 132, so that when the AC source 201 supplies power to the power conversion unit 132, the power supply circuit of the DC source 202 can be cut off, thereby avoiding the waste of electric energy of the DC source 202 and improving the energy utilization efficiency.

[0032] As an optional implementation, in the energy storage inverter 100 of the embodiment of the present application, the power selection unit 133 also includes a capacitor and a Zener diode, the first end of the capacitor is electrically connected to the first end of the DC source 202, and the second end of the capacitor is electrically connected to the connection node between the first resistor and the second resistor; the Zener diode is connected in parallel with the capacitor.

[0033] Specifically, Figure 2As shown, one end of the capacitor C1 is electrically connected to the negative electrode of the DC source 202, and the other end is electrically connected to the connection node between the first resistor R1 and the second resistor R2, forming a filter circuit. The capacitor C1 can store charge and release it when the voltage fluctuates, reducing voltage ripple, ensuring that the driving voltage of the first switch tube Q1 is more stable, and reducing the miscontrol caused by power supply fluctuations on the drive; in addition, when DC power is supplied, the DC source can charge the capacitor C1 through the first resistor R1, and D2 is a voltage regulator tube, so that the maximum voltage on the capacitor C1 is clamped at a fixed value, preventing the Vgs voltage from exceeding the maximum voltage value that the gate and source of the Q1 tube can withstand, thereby protecting Q1; when the capacitor C1 exceeds the threshold voltage of the Q1 tube, the Q1 tube is turned on, the power conversion circuit starts to work, and the output voltage provides auxiliary power for other active low-voltage circuits.

[0034] Furthermore, the energy storage converter 100 further includes a control unit, which is electrically connected to the control end of the first switch tube Q1, and the control unit is used to control the on and off of the first switch tube Q1 according to the state of the AC source 201. In one embodiment, the control unit can reuse the first control circuit 12. In another embodiment, the control unit can be additionally configured. For example, Figure 3 As shown, the control unit 134 provided in the embodiment of the present application may include an optocoupler and a second switch tube, an input end of the optocoupler is electrically connected to the second switch tube, and the second switch tube is used to control the on and off of the input diode of the optocoupler; the first output end of the optocoupler is electrically connected to the control end of the first switch tube, and the second output end of the optocoupler is electrically connected to the first input end of the power conversion unit 132.

[0035] Among them, the optocoupler can be composed of an input diode and an output transistor, which are packaged in the same tube shell. The input diode can be a light emitting diode, which serves as the light source at the input end of the optocoupler, and the output transistor can serve as a light receiving device at the output end of the optocoupler.

[0036] Combination Figure 2 and Figure 3 An input end of the optocoupler U1 is electrically connected to the second switch tube Q2, and the on-off of the input diode of the optocoupler U1 is controlled by controlling the on-off of the second switch tube Q2. In addition, an optocoupler output end shut_down is electrically connected to the control end of the first switch tube Q1, and another optocoupler output end is electrically connected to the first input end BUS- of the power conversion unit 132.

[0037] When the AC source 201 is normally powered, the control terminal Aux_pwroff of the second switch tube Q2 is controlled to output a high level, the second switch tube Q2 is turned on, and the input diode of the optocoupler U1 is forward-conducted, and the output transistor of the optocoupler U1 is turned on. At this time, the shut_down terminal of the output transistor of the optocoupler U1 is equivalent to being electrically connected to the first input terminal BUS- of the power conversion unit 132. At this time, the potential of the control terminal of the first switch tube Q1 is pulled down, thereby causing the gate-source voltage Vgs of the first switch tube Q1 to be less than the preset threshold voltage, and the first switch tube Q1 is disconnected, cutting off the power supply circuit of the DC source 202, and the AC side alone supplies power to the power conversion unit 132.

[0038] When the AC source 201 is abnormally powered or disconnected, the control terminal Aux_pwroff of the second switch tube Q2 is controlled to output a low level, the second switch tube Q2 is disconnected, the input diode of the optocoupler U1 is disconnected, and the output transistor of the optocoupler U1 is disconnected. At this time, the shut_down terminal of the output transistor of the optocoupler U1 is disconnected from the first input terminal BUS- of the power conversion unit 132, and the DC source can charge the capacitor C1 through the first resistor R1, so that the gate-source voltage Vgs of the first switch tube Q1 increases until the voltage is greater than or equal to the threshold voltage, the first switch tube Q1 is turned on, the DC source 202 supplies power to form a loop, and the DC source supplies power to the power conversion unit 132 alone.

[0039] In order to detect the state of the AC source 201, a sampling circuit can be set to collect the output voltage or output current of the AC source, and determine whether the AC source is abnormal based on the collected output voltage or output current. For example, when the output voltage of the AC source is 0, it is determined that the AC source is disconnected and that the AC source is in an abnormal state.

[0040] According to the above description, the control unit 134 realizes the control of the on-off of the first switch tube, and further controls the on-off of the power supply circuit from the DC source 202 to the power conversion unit 132, so that when the AC source 201 supplies power to the power conversion unit 132, the control unit 134 can disconnect the first switch tube, and further cut off the power supply circuit from the DC source 202 to the power conversion unit 132, thereby avoiding the waste of electric energy of the DC source 202. In addition, the optocoupler setting of the control unit 134 realizes the isolation of electrical signals, avoiding the interference and safety risks that may be caused by the direct electrical connection between high and low voltage circuits, and also improves the transmission speed and stability of the control signal through optical signal transmission.

[0041] As another optional implementation, in the energy storage inverter 100 of the embodiment of the present application, the control unit 134 includes a relay or a digital isolation chip. When the relay or the digital isolation chip is turned on, the potential of the control terminal of the first switch tube is pulled down, so that the first switch tube is disconnected, thereby isolating the DC source from the power conversion unit, and the DC source stops supplying power to the power conversion unit, thereby reducing the energy consumption of the DC source.

[0042] like Figure 4 As shown, as another optional implementation, the positive pole of the DC source 202 is defined as the first end of the DC source 202, the negative pole of the DC source 202 is defined as the second end of the DC source 202, the AC power supply is the power supply connected to the AC side of the energy storage converter 100 shown in the figure, A, B, and C represent the three phases of the AC source 201, the DC power supply is the power supply connected to the DC side of the energy storage converter 100 shown in the figure, BAT+ represents the positive pole of DC power, BAT- represents the negative pole of DC power, the first input end of the power conversion unit 132 is defined as BUS+, and the second input end of the power conversion unit 132 is defined as BUS-. One end of the first switch tube Q1 is electrically connected to the first input end BUS+ of the power conversion unit 132, the other end of the first switch tube Q1 is electrically connected to the positive end BAT+ of the DC source 202, and the control end of the first switch tube Q1 is electrically connected to the control unit. When the AC source is abnormal or disconnected, the control unit generates a driving voltage for the first switch tube Q1, controls the first switch tube Q1 to be turned on, and the DC source 202 can supply power to the power conversion unit 132; when the AC source is normal, the control unit generates a control signal to control the first switch tube Q1 to be disconnected, the first switch tube is disconnected, and the DC source 202 stops supplying power to the power conversion unit 132.

[0043] Exemplarily, the first switch tube can be a MOS tube, IGBT, triode, relay, etc., and the control of the first switch tube is achieved by setting an appropriate driving circuit in the control unit to cooperate with the control signal generated by the control unit, thereby realizing the selection of the input voltage source of the power conversion unit.

[0044] According to the above description, through the first switch tube, the power selection unit 133 can control the on and off of the power supply circuit of the DC source 202 to the power conversion unit 132, so that when the AC source 201 supplies power to the power conversion unit 132, the power supply circuit of the DC source 202 can be cut off, thereby avoiding the waste of electric energy of the DC source 202 and improving the energy utilization efficiency. As an optional implementation method, the energy storage converter 100 of the embodiment of the present application also includes a control unit 134, the control unit 134 is electrically connected to the control end of the first switch tube, and the control unit 134 is used to control the on and off of the first switch tube.

[0045] Combination Figure 3 and Figure 4, the output end shut_down of the optocoupler U1 of the control unit 134 is electrically connected to the control end of the first switch tube Q1, and the other output end of the optocoupler is electrically connected to the input end BUS+ of the power conversion unit 132. In this embodiment, the control principle of the control unit 134 and the power selection unit 133 is similar to the above. In actual use, the switch tube type or driving method can be changed accordingly, which will not be repeated here.

[0046] As an optional implementation, the energy storage converter 100 of the embodiment of the present application further includes a sampling unit 135, which is used to collect the voltage of the AC source 201, and the sampling unit 135 is coupled to the control end of the second switch tube.

[0047] Specifically, the sampling unit 135 can collect voltage information of the AC source 201 in real time, and the sampling unit 135 is connected to the control end of the second switch tube through a control signal generating unit 136. The control signal generating unit 136 can generate a corresponding control signal according to the voltage state of the AC source 201 collected by the sampling unit 135, and input the control signal to the control end of the second switch tube Q2 to adjust the on-off state of the second switch tube Q2, thereby controlling the power supply of the DC power supply; that is, the sampling unit 135 and the control end of the second switch tube Q2 are coupled through the control signal generating unit 136.

[0048] Specifically, when the sampling unit 135 detects that the output voltage of the AC source 201 is a preset normal voltage, the second switch tube Q2 of the control unit 134 is turned on, at this time the input diode of the optocoupler is turned on, and the output end of the optocoupler is turned on. At this time, the control end of the first switch tube is equivalent to being electrically connected to the first input end BUS- of the power conversion unit 132, the potential of the first switch tube Q1 is pulled down and the first switch tube is disconnected, the path between the DC source 202 and the power conversion unit 132 is disconnected, and the DC source 202 stops supplying power to the power conversion unit 132.

[0049] On the contrary, when the sampling unit 135 detects that the output voltage of the AC source 201 is abnormal, the second switch tube Q2 of the control unit 134 is disconnected. At this time, the two output ends of the output transistor of the optocoupler U1 are disconnected, and the potential of the control end of the first switch tube is determined by the DC positive end. The potential of the control end of the first switch tube is high, and the first switch tube is turned on. A path is formed between the DC source 202 and the power conversion unit 132, and the DC source 202 supplies power to the power conversion unit 132.

[0050] The sampling unit 135 can monitor the voltage state of the AC source 201 and adjust the input power selection of the power conversion unit 132 according to the voltage change.

[0051] As an optional implementation, the power conversion unit 132 may be provided with a first flyback circuit and a second flyback circuit. Figure 5 As shown, the input port of the first flyback circuit is coupled to the AC source 201 through the rectifier circuit unit 131, thereby receiving the DC power processed by the rectifier circuit unit 131. In the power conversion unit 132, the first flyback circuit can convert the voltage provided from the AC source 201 to the power conversion unit 132 into a voltage matching the first control circuit 12, so that the AC source 201 supplies power to the first control circuit 12. Figure 6 As shown, in the second flyback circuit, the input port of the second flyback circuit is coupled to the DC source 202 through the power selection unit 133, and the second flyback circuit can convert the voltage supplied by the DC source 202 into a voltage matching the first control circuit 12, thereby enabling the DC source 202 to supply power to the first control circuit 12.

[0052] According to the above description, through the setting of two sets of flyback circuits, the voltage conversion work when the AC source 201 and the DC source 202 supply power to the first control circuit 12 is completed by different flyback circuits respectively, thereby improving the safety of the voltage conversion work of the power conversion unit 132.

[0053] As an optional implementation, Figure 6 As shown, the power selection unit 133 also includes a first diode D2 and a second diode D3, wherein the anode of the first diode D2 is electrically connected to the positive end of the DC source, the cathode of the first diode D2 is electrically connected to the positive input end of the flyback circuit, the anode of the second diode D3 is electrically connected to the negative input end of the flyback circuit, and the cathode of the second diode D3 is electrically connected to the negative end of the DC source. By setting the diodes, both the AC source and the DC source can be converted into voltage through a flyback circuit, and the AC source will not interfere with the DC source and affect the DC source.

[0054] As another optional implementation, in the energy storage converter 100 of the embodiment of the present application, the power conversion unit 132 includes a flyback circuit (such as Figure 7 As shown) and a first diode and a second diode, the input port of the flyback circuit is coupled to the AC source 201 through the rectifier circuit unit 131, and the input port of the flyback circuit is electrically connected to the DC source 202 through the diode, and the flyback circuit is configured to convert the voltage of at least one of the AC source 201 and the DC source 202 into a voltage matching the first control circuit 12.

[0055] Specifically, in this embodiment, the power conversion unit 132 can be provided with only one flyback circuit, which is conducive to reducing costs. The input port of the flyback circuit is coupled to the AC source 201 through the rectifier circuit unit 131. After the power supply of the AC source 201 is converted into DC power by the rectifier circuit unit 131, it enters the above-mentioned flyback circuit for voltage conversion. The flyback circuit converts it into a voltage that matches the voltage of the first control circuit 12. Figure 6 similar, Figure 7 The power selection unit 133 is also provided with a first diode D2 and a second diode D3, wherein the anode of the first diode D2 is electrically connected to the positive end of the DC source, the cathode of the first diode D2 is coupled to the positive input end of the flyback circuit, the anode of the second diode D3 is coupled to the negative input end of the flyback circuit, and the cathode of the second diode D3 is electrically connected to the negative end of the DC source; it should be noted that coupling includes electrical connection or at least electrical connection through the first switch tube. Figure 6 For example, the negative input terminal of the flyback circuit is connected to the negative terminal of the DC source BAT- through the first switch tube Q1 and the second diode D3. At this time, the cathode of the first diode is electrically connected to the positive input terminal of the flyback circuit; and when Figure 4 As shown, when the first switch tube Q1 is set between the positive end of the DC source and the bus BUS+, the anode of the first diode is electrically connected to the positive end of the DC source, the cathode of the first diode is electrically connected to the positive input end of the flyback circuit through the first switch tube Q1, and the anode of the second diode is electrically connected to the negative input end of the flyback circuit. Through the setting of the diode, both the AC source and the DC source can be converted into voltage through a flyback circuit, and the AC source will not interfere with the DC source and affect the DC source. In this embodiment, through the setting of the first diode D2 and the second diode D3, only one flyback circuit needs to be set to achieve the switching of the power supply, which is beneficial to reduce the circuit cost.

[0056] According to the above description, the present application provides an energy storage inverter 100, including a bidirectional conversion circuit 11 and a first control circuit 12 at least for controlling the bidirectional conversion circuit 11. The energy storage inverter 100 includes an auxiliary power supply module 13 for powering the first control circuit 12. The auxiliary power supply module 13 can cut off the power supply of the DC source 202 when the AC source 201 is normal, reduce the power loss of the DC source 202, and improve the energy utilization efficiency; it also realizes that when the AC source 201 is disconnected, the DC source 202 is switched as the input source of the auxiliary power supply module to power the first control circuit 12, thereby improving the stability and reliability of the energy storage inverter 100.

[0057] The energy storage converter provided by the embodiment of the present application has the following beneficial effects: 1. The auxiliary power module of the energy storage converter has controllable AC and DC power supply. When the AC power is cut off, it automatically switches back to the DC side for power supply. In this way, the standby loss of the battery can be reduced and the battery utilization rate can be improved. In addition, the control method of the energy storage converter provided by the present application is simple and the cost is low. The efficiency of the whole PCS (Power Conversion System, energy storage converter) can be improved by simple switch switching. 2. Reduce costs. Higher overall efficiency means less energy loss during the use of the energy storage system, thereby reducing operating costs. 3. Increase revenue. When participating in the electricity market, efficient energy storage systems can respond more accurately to market price fluctuations and achieve higher revenue. 4. The energy storage converter provided in the present application can monitor the input and output status of the power conversion circuit through a sampling circuit, and can switch immediately when a fault occurs, thereby ensuring the reliability of the energy storage converter circuit.

[0058] It will be appreciated that the word "exemplary" as used herein means "serving as an example, instance, or illustration". Any embodiment described as "exemplary" is not necessarily preferred or superior to other embodiments and / or does not exclude the combination of features of other embodiments. It will be appreciated that certain features of the present application described in the context of separate embodiments for the sake of clarity may also be provided in a single embodiment by combination. Conversely, various features of the present application described in the context of a single embodiment for the sake of clarity may also be provided individually or in any suitable combination or as any other described embodiment of the present application.

[0059] The above disclosure is only the preferred embodiment of the present application, but it is not intended to limit the scope of rights of the present application. A person of ordinary skill in the art can understand that without departing from the spirit and scope of the present application and the appended claims, changes, modifications, substitutions, combinations, and simplifications should all be equivalent replacement methods and still fall within the scope of the invention.

[0060] The application fields of the technology of the present invention include but are not limited to pipeline safety. As long as the essence of the technical solution does not deviate from the scope of the technical solution of each embodiment of the present invention, it falls within the protection scope of the present invention.

Claims

1. An energy storage converter, comprising a bidirectional conversion circuit and at least a first control circuit for controlling the bidirectional conversion circuit, characterized in that: The energy storage converter further includes an auxiliary power supply module, which is used at least to supply power to the first control circuit. The auxiliary power supply module includes: A rectifier circuit unit, wherein an AC end of the rectifier circuit unit is electrically connected to an AC source; a power conversion unit, the power conversion unit comprising an input port and an output port, the input port being electrically connected to the DC port of the rectifier circuit unit, and the input port being coupled to a DC source, the output port being used to be electrically connected to the first control circuit, the power conversion unit being configured to convert a voltage of at least one of the AC source and the DC source into a voltage matching the first control circuit; A power selection unit is provided between the input port of the power conversion unit and the DC source, and is used to control the on-off between the input port and the DC source.

2. The energy storage converter according to claim 1, characterized in that: The power selection unit includes a first switch tube, a first end of the first switch tube is electrically connected to the input port of the power conversion unit; and a second end of the first switch tube is electrically connected to the DC source; The energy storage converter further includes a control unit, which is electrically connected to a control end of the first switch tube, and is used to control the on and off of the first switch tube according to a state of the AC source.

3. The energy storage converter according to claim 2, characterized in that: When the state of the AC source is normal, the first switch tube is controlled to be disconnected, and the power supply of the power conversion unit comes from the AC source; When the state of the AC source is abnormal, the first switch tube is controlled to be closed, and the power supply of the power conversion unit comes from the DC source.

4. The energy storage converter according to claim 2, characterized in that: The power selection unit also includes a first resistor, a second resistor and a third resistor. The first switch tube is arranged between the first end of the DC source and the first input end of the power conversion unit. The control end of the first switch tube is electrically connected to the first end of the DC source through the third resistor, and the control end is electrically connected to the second end of the DC source through the first resistor and the second resistor.

5. The energy storage converter according to claim 4, characterized in that: The power selection unit also includes a capacitor and a zener diode, the first end of the capacitor is electrically connected to the first end of the DC source, the second end of the capacitor is electrically connected to the connection node between the first resistor and the second resistor; the zener diode is connected in parallel with the capacitor.

6. The energy storage converter according to claim 5, characterized in that: The first switch tube is an N-MOS; the first end of the first switch tube is the drain of the N-MOS; the second end of the first switch tube is the source of the N-MOS; the control end of the first switch tube is the gate of the N-MOS; the source is electrically connected to the negative end of the DC source, and the drain is electrically connected to the low potential port of the input port.

7. The energy storage converter according to any one of claims 2 to 6, characterized in that: The control unit comprises an optical coupler and a second switch tube, an input end of the optical coupler is electrically connected to the second switch tube, and the second switch tube is used to control the on and off of the input diode of the optical coupler; The first output end of the optical coupler is electrically connected to the control end of the first switch tube, and the second output end of the optical coupler is electrically connected to the first input end of the power conversion unit.

8. The energy storage converter according to claim 7, characterized in that: The energy storage converter further includes a sampling unit, which is used to collect the voltage of the AC source, and the sampling unit is coupled to the control end of the second switch tube.

9. The energy storage converter according to any one of claims 2 to 6, characterized in that: The control unit includes a relay or a digital isolation chip, and the control end of the first switch tube is electrically connected to the first input end of the power conversion unit through the relay or the digital isolation chip; Alternatively, the power conversion unit includes a first flyback circuit and a second flyback circuit, an input port of the first flyback circuit is coupled to the AC source through the rectifier circuit unit, and the first flyback circuit is configured to convert a voltage of the AC source into a voltage matching the first control circuit; An input port of the second flyback circuit is coupled to the DC source, and the second flyback circuit is configured to convert a voltage of the DC source into a voltage matching the first control circuit.

10. The energy storage converter according to any one of claims 1 to 6, characterized in that: The power conversion unit includes a flyback circuit, wherein the flyback circuit is configured to convert a voltage of at least one of the AC source and the DC source into a voltage matching the first control circuit; The power selection circuit also includes a first diode and a second diode, the anode of the first diode is electrically connected to the positive end of the DC source, the cathode of the first diode is coupled to the positive input end of the flyback circuit, the anode of the second diode is coupled to the negative input end of the flyback circuit, and the cathode of the second diode is electrically connected to the negative end of the DC source.

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