Power distribution circuit and electric equipment

Abstract

The embodiment of the utility model discloses a power distribution circuit and electric equipment, which are used for power distribution between a battery and a direct current module, and comprises a switch connected between the battery and the direct current module; the switching circuit comprises an energy storage unit, and the energy storage unit is connected between the switch and the battery or the direct current module; the switching circuit is provided with a logic input end, the energy storage unit is provided with a signal output end, and the signal output end is connected with the switch. The power distribution circuit provided by the utility model can store energy in advance through the energy storage unit and quickly turn on the switch, and shortens the conduction time of the switch, thereby accelerating the connection rate of the battery and the DC module, and further reducing the loss of the switch.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution, in particular to a power distribution circuit and an electric device. Background Art

[0002] High-current power network generators (PNG) are widely used in fields that require high-current power distribution and management, such as industrial automation, stage lighting, electric vehicles, solar energy systems, etc. High-current power network generators can provide flexible and reliable power distribution solutions to meet the needs of various high-power loads. Currently, high-current power network generators on the market are mainly used to replace traditional high-current fuses, and are prone to excessive losses in switches. Utility Model Content

[0003] The embodiments of the present application provide a power distribution circuit and an electrical device to improve the structure of a high-current power network distributor and reduce switch losses.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In a first aspect, a power distribution circuit is provided for distributing power between a battery and a DC module, comprising:

[0006] A switch connected between the battery and the DC module;

[0007] A switch circuit, wherein the switch circuit comprises an energy storage unit, and the energy storage unit is connected between the switch and the battery or the DC module;

[0008] The switch circuit has a logic input terminal, and the energy storage unit has a signal output terminal, and the signal output terminal is connected to the switch.

[0009] In a second aspect, an electrical device is provided, wherein the electrical device comprises a power distribution circuit as described in any one of the first aspects.

[0010] One of the above technical solutions has the following advantages or beneficial effects:

[0011] The present application provides a power distribution circuit for power distribution between a battery and a DC module, including: a switch connected between the battery and the DC module; a switch circuit, the switch circuit including an energy storage unit connected between the switch and the battery or the DC module; the switch circuit has a logic input terminal, the energy storage unit has a signal output terminal, and the signal output terminal is connected to the switch. The power distribution circuit provided by the present application can store energy in advance through the energy storage unit and quickly open the switch, shortening the conduction time of the switch, thereby accelerating the connection rate between the battery and the DC module, and further reducing the loss of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0013] Figure 1 A schematic diagram of a module of a power distribution circuit provided by an embodiment of the present application;

[0014] Figure 2 A module schematic diagram of a power distribution circuit provided in yet another embodiment of the present application;

[0015] Figure 3 A schematic diagram of component connections of a switch circuit provided in an embodiment of the present application;

[0016] Figure 4 A schematic diagram of connecting components of a driving circuit provided in an embodiment of the present application;

[0017] Figure 5 A schematic diagram of circuit connections of a switch circuit and a switch provided in an embodiment of the present application;

[0018] Figure 6 A schematic diagram of the conduction time of an electrical device provided in an embodiment of the present application;

[0019] Figure 7 A schematic diagram of the shutdown time of an electrical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. In the description of the present application, it is necessary to understand that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0021] The specific implementation methods of the present application are further described below through the examples:

[0022] like Figure 1 As shown, an embodiment of the present application provides a power distribution circuit for distributing power between a battery and a DC module, including: a switch and a switching circuit, the switch being connected between the battery and the DC module; the switching circuit including an energy storage unit, the energy storage unit being connected between the switch and the battery or the DC module; the switching circuit having a logic input terminal, the energy storage unit having a signal output terminal, and the signal output terminal being connected to the switch.

[0023] Working principle: The logic input terminal in the switching circuit is configured to receive a logic signal. In response to the logic signal being at a first level, the energy storage unit in the switching circuit outputs a switching signal. The switch connects the battery and the DC module in response to the received switching signal, thereby achieving rapid connection between the battery and the DC module.

[0024] The logic signal can be taken from the MCU chip or the external circuit, and the logic signal has high and low potentials, wherein the first level is a low level and the second level is a high level.

[0025] In the solution provided in the embodiment of the present application, the main function of the switch is to control the connection between the battery and the DC module. When the DC module side is connected to a load, the battery can be connected to the DC module through the switch to enable the battery to supply power to the load on the DC module side; when the battery is feeding power, a DC power supply is connected to the DC module side, and the switch can connect the battery and the DC module to enable the DC power supply to charge the battery.

[0026] In the solution provided in the embodiment of the present application, the switch circuit is used to control the conduction of the switch, and the switch is turned on by sending a switch signal to the switch through the energy storage unit in the switch circuit. Therefore, in the power-on stage, the energy storage unit is charged by the DC power supply connected to the battery or DC module side until it is full. At this time, if the logic signal received by the switch circuit is the first level, the path between the energy storage unit and the switch is connected, and the energy storage unit outputs a switch signal. After receiving the switch signal, the switch connects the battery and the DC module. The power distribution circuit provided in the embodiment of the present application can shorten the conduction time of the switch, speed up the connection rate between the battery and the DC module, and thus reduce the loss of the large switch.

[0027] like Figure 1 and Figure 3 As shown, in the embodiment of the present application, the energy storage unit includes a second capacitor C2, and the switching circuit includes a fourth transistor Q4, a first diode D1, a third diode D3, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a fifth transistor Q5; the base of the fourth transistor Q4 is configured to be connected to the logic input end for receiving a logic signal, the collector of the fourth transistor Q4 is connected to the cathode of the first diode D1, the emitter of the fourth transistor Q4 is grounded, the anode of the first diode D1 is connected to one end of the third resistor R3 and the fourth resistor R4, the other end of the third resistor R3 is connected to the base of the fifth transistor Q5, and the other end of the fourth resistor R4 is connected to the fifth transistor Q5. The collector of the transistor Q5 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the cathode of the third diode D3, the anode of the third diode D3 is connected to the positive electrode of the battery or the DC module, one end of the fifth resistor R5 is also connected to one end of the second capacitor C2, the other end of the second capacitor C2 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the emitter of the fifth triode Q5; the fourth triode Q4 is cut off when the received logic signal is at the first level, the battery or the DC module is configured to charge the second capacitor C2, the second capacitor C2 is configured to turn on the fifth triode Q5 after being fully charged, and output a switching signal through the fifth triode Q5 to turn on the switch.

[0028] The specific working process includes: the second capacitor C2 is connected to the positive electrode of the battery through the fifth resistor R5 and the third diode D3. When the circuit is powered on, the battery charges the second capacitor C2, wherein the third diode D3 is used to prevent the current of the second capacitor C2 from flowing back, and the fifth resistor R5 is used to limit the current of the battery to avoid excessive current from damaging the second capacitor C2. When the second capacitor C2 is fully charged and the logic signal is at a low level, the fourth transistor Q4 is cut off, at which time the second capacitor C2 outputs current and reaches the base of the fifth transistor Q5 along the fourth resistor R4 and the third resistor R3 to turn on the fifth transistor Q5. After the fifth transistor Q5 is turned on, the second capacitor C2 outputs a switching signal to the switch through the fifth transistor Q5. The switch is turned on after receiving the switching signal, thereby realizing the connection between the battery and the DC module.

[0029] like Figure 3 As shown, in the scheme provided in the embodiment of the present application, the working principles and processes of each component in the circuit include: the second capacitor C2 is mainly used to charge through the battery when the circuit is powered on, and after being fully charged and the logic signal is at a low level, a switching signal is transmitted to the switch to turn on the switch; the main function of the third diode D3 is to limit the current of the second capacitor C2 and other paths to flow back to the battery; the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 prevent the components from being damaged by excessive current in the circuit through voltage division and current limiting, thereby protecting the components in the circuit; the fifth transistor Q5 mainly plays a switching role. When the second capacitor C2 has no current output, the fifth transistor Q5 is turned off, and when the second capacitor C2 outputs current, the fifth transistor Q5 is turned on. The first diode D1 utilizes the characteristic of unidirectional conduction and reverse cutoff to prevent the current on the collector side of the fourth transistor Q4 from flowing back to the fifth transistor Q5, thereby preventing the fifth transistor Q5 from being mistakenly turned on; it should be noted that the fourth transistor Q4 mainly controls the timing of the second capacitor C2 transmitting the switch signal to the switch according to the level of the logic signal, thereby avoiding the situation where the current of the second capacitor C2 is released too early and the switch cannot be turned on; when the logic signal is at a high level, the fourth transistor Q4 is turned on, and since the emitter of the fourth transistor Q4 is grounded, the voltage of the base of the fifth transistor Q5 is pulled down, thereby making the fifth transistor Q5 turned off; and when the logic signal is at a low level, the fourth transistor Q4 is turned off, and at this time, the current output by the second capacitor C2 pulls up the voltage of the base of the fifth transistor Q5, thereby turning on the fifth transistor Q5 and enabling the second capacitor C2 to turn on the switch. The energy storage unit provided in the embodiment of the present application, namely the second capacitor C2, can quickly output a switching signal according to the logic signal control, shorten the conduction time of the switch, thereby speeding up the connection rate between the battery and the DC module, and further reducing the loss of the switch.

[0030] like Figure 2As shown, in an embodiment of the present application, the switching circuit also includes a pull-down unit, one end of the pull-down unit is connected to the switch, and the other end is grounded; in response to the logic signal being a second level, the pull-down unit turns off the switch to disconnect the battery from the DC module.

[0031] The specific working process includes: the switch signal turns on the switch by pulling up the potential of the switch control terminal, so the switch can be turned off by pulling down the potential of the switch control terminal. When the logic signal is at a high level, the pull-down unit is grounded, and the switch is turned off after the potential of the switch control terminal is pulled down. The embodiment of the present application uses the pull-down unit to quickly disconnect the connection between the battery and the DC module.

[0032] like Figure 2 and Figure 3 As shown, in the embodiment of the present application, the pull-down unit includes a first capacitor C1 and a sixth resistor R6, the switch circuit includes a first diode D1, a second transistor Q2 and a fourth transistor Q4, the base of the fourth transistor Q4 is configured to receive a logic signal, the collector of the fourth transistor Q4 is connected to the cathode of the first diode, the emitter of the fourth transistor Q4 is grounded, the anode of the first diode D1 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is connected to the base of the second transistor Q2, the collector of the second transistor is connected to one end of the switch, the emitter of the second transistor Q2 is connected to the other end of the switch, one end of the sixth resistor R6 is connected to the emitter of the second transistor Q2, and the other end of the sixth resistor R6 is connected to the collector of the second transistor Q2; the fourth transistor Q4 is turned on in response to the received logic signal being a second level, and pulls down the potential of one end of the switch through the first diode D1, the first capacitor C1 and the second transistor Q2 to turn off the switch.

[0033] The specific working process includes: when the logic signal is at a high level, the fourth transistor Q4 is turned on, and the emitter of the fourth transistor Q4 is grounded, thereby pulling down the base potential of the fifth transistor Q5, so that the fifth transistor Q5 is cut off, and the second capacitor C2 is consumed after being grounded through the fourth resistor R4, the first diode D1 and the fourth transistor Q4; and the potential of the switch control end is also pulled down, and the power of the switch control end is consumed through the sixth resistor R6, thereby turning off the switch. The embodiment of the present application pulls down the potential of the switch control end through the fourth transistor Q4, and consumes the power of the switch control end through the sixth resistor R6, thereby realizing rapid shutdown of the switch, thereby realizing rapid disconnection of the battery and the DC module.

[0034] like Figure 3As shown, in the embodiment of the present application, the switch circuit also includes a drive circuit, which is configured to output a drive signal; the switch circuit includes a first resistor R1, a second resistor R2, a first transistor Q1, a second diode D2, a fifth resistor R5 and a fifth transistor Q5; one end of the first resistor R1 is connected to the drive circuit and is configured to receive the drive signal, the other end of the first resistor R1 is connected to the collector of the first transistor Q1, the second resistor R2 is connected between the base and the collector of the first transistor Q1, the emitter of the first transistor Q1 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the collector of the fifth transistor Q5, and the emitter of the fifth transistor Q5 is connected to the switch; the first transistor Q1 is turned on in response to the received drive signal, and the drive signal is output as a switch signal through the fifth transistor Q5 to turn on the switch.

[0035] The specific working process includes: the driving circuit provided in the embodiment of the present application includes a boost driver Boostdriver, which is a circuit for driving and controlling a boost converter. The boost driver is usually composed of a control part and a drive part. Among them, the control part is responsible for monitoring the input voltage and the output voltage, and accurately controlling the switching elements of the boost converter as needed; the drive part is responsible for driving the switching elements (such as MOSFET or IGBT) in the boost converter to perform switching operations under the control signal.

[0036] In the solution provided in the embodiment of the present application, the driving circuit outputs a 24V driving signal. After the driving signal flows through the first resistor R1, it is shunted through the second resistor R2 and pulls up the potential of the base of the first transistor Q1. At this time, the first transistor Q1 is turned on at a high potential, and the driving signal reaches the collector of the fifth transistor Q5 through the first transistor Q1, the second diode D2 and the fifth resistor R5, and pulls up the potential of the fifth transistor Q5 through the fourth resistor R4 and the third resistor R3. After the fifth transistor Q5 is turned on, part of the current of the driving signal acts on the control end of the switch through the fifth transistor Q5, thereby turning on the switch.

[0037] like Figure 4 As shown, in the embodiment of the present application, the driving circuit includes a driving chip, the driving chip has a driving output terminal GATE, and the driving output terminal GATE is connected to the first resistor.

[0038] The specific working process includes: the model of the driving chip is AUIR3241S, and the driving chip has a first pin IN, a second pin GND, a third pin RS, a fourth pin SW, a fifth pin SOURCE, a sixth pin (driving output terminal GATE), a seventh pin VCC and an eighth pin OUT; wherein, the first pin IN is connected to a working voltage of 3.3V, the second pin GND is connected to the ground, the third pin RS is connected to the eighth pin OUT through the inductor L and the third capacitor C3, the fourth pin SW is connected to the seventh resistor R7 and then to the ground, the fifth pin SOURCE is connected to the eighth resistor R8 and then connected between the third capacitor C3 and the inductor L, and the seventh pin VCC is connected to the battery and the DC module through the Xth diode and the Yth diode, wherein the cathodes of the D4th diode and the D5th diode are connected to the seventh pin VCC, the anode of the D4th diode is connected to the battery, and the anode of the D5th diode is connected to the DC module.

[0039] In the solutions provided in some other embodiments of the present application, the model of the driver chip of the driver circuit can also be any one of LM2577, LTC3780, XL6009, TPS61220 and MAX1771. The above are only a few of the more common driver chip models. In actual selection, the most suitable driver chip model needs to be determined according to specific application requirements, circuit design requirements and performance requirements. Therefore, the embodiments of the present application will not be listed in detail here.

[0040] like Figure 5 As shown, in the embodiment of the present application, the switch includes a first switch tube Q11 and a second switch tube Q12, the gates of the first switch tube Q11 and the second switch tube Q12 are both connected to the switch circuit, the drain of the first switch tube Q11 is connected to the drain of the second switch tube Q12, the source of the first switch tube Q11 is connected to the battery, and the source of the second switch tube Q12 is connected to the DC module.

[0041] The specific working process includes: connecting the drains of the first switch tube Q11 and the second switch tube Q12 to each other and then realizing parallel control of the two switch tubes. Through the parallel control of the first switch tube Q11 and the second switch tube Q12, the load current can be shared, so that the current can be diverted from the first switch tube Q11 to the second switch tube Q12, effectively increasing the current carrying capacity and reducing the load of each switch tube. At the same time, through the parallel connection of the first switch tube Q11 and the second switch tube Q12, the two switch tubes can share the load, reducing the current and heat on a single switch tube, thereby reducing the power consumption and loss of the switch tube. It helps to improve the reliability and stability of the circuit and extend the life of the switch tube.

[0042] like Figure 3 and Figure 5As shown, in the embodiment of the present application, the capacitance of the second capacitor C2 is greater than the sum of the capacitance of the gate and the source of the first switch tube Q11 and the capacitance of the gate and the source of the second switch tube Q12.

[0043] The specific working process includes: the second capacitor C2 releases the corresponding charge after the battery is fully charged to drive the first switch tube Q11 and the second switch tube Q12; since there is a certain inter-electrode capacitance between the gate and the source of the first switch tube Q11 and the second switch tube Q12, if the capacitance of the second capacitor C2 is less than the sum of the inter-electrode capacitance of the first switch tube Q11 and the second switch tube Q12, the second capacitor C2 is insufficient to turn on the first switch tube Q11 and the second switch tube Q12. In order to ensure that the second capacitor C2 can turn on the first switch tube Q11 and the second switch tube Q12, the capacitance of the second capacitor C2 is at least 1.5 times to 2 times the sum of the capacitance of the inter-electrode capacitance of the first switch tube Q11 and the second switch tube Q12. In some other embodiments of the present application, the capacitance of the second capacitor C2 can also be more than 2 times the sum of the capacitance of the inter-electrode capacitance of the first switch tube Q11 and the second switch tube Q12. The capacitance of the second capacitor C2 can be selected according to the actual situation of the circuit, and the embodiments of the present application are not listed in detail here.

[0044] like Figure 3 and Figure 4 As shown, in the embodiment of the present application, when the logic signal is at the second level, the voltage of the logic signal is greater than 2V; when the logic signal is at the first level, the voltage of the logic signal is less than 1V.

[0045] The specific working process includes: the operating voltage of the driving chip in the scheme provided in the embodiment of the present application is 3.3V, so the logic signal with a voltage less than 1V is set as a low-level signal, and the logic signal with a voltage greater than 2V is set as a high-level signal. By setting the model or structure of the fourth transistor Q4, it can be achieved that the voltage of the logic signal is less than 1V and it is turned on when the voltage of the logic signal is greater than 2V. In the schemes provided in some other embodiments of the present application, the low level of the logic signal can also be less than 0.8V or 0.5V, and the high level of the logic signal can also be greater than 2.5V or 3V. How to design the high and low levels of the specific logic signal can be selected according to the connection relationship of the actual circuit or the different components, and the embodiments of the present application will not be listed in detail here.

[0046] like Figure 3 , Figure 4 and Figure 5 As shown, in an embodiment of the present application, there are multiple switches, and the multiple switches are connected in series or in parallel between the battery and the DC module. Each switch is respectively connected to a switching circuit, and the multiple switching circuits are connected to one driving circuit.

[0047] like Figure 4FIG. 1 is a schematic diagram showing the connection of components of a driving circuit provided in an embodiment of the present application; Figure 5 Shown is a circuit connection diagram of a switch circuit and a switch provided in an embodiment of the present application. Figure 4 The driving circuit and Figure 5 The switch circuit and the switch device are connected to form the power distribution circuit provided by the embodiment of the present application. Figure 4 The first connection terminal K1 in the circuit is connected to Figure 5 The third connection terminal K3 in the circuit is connected to, Figure 4 The second connection terminal K2 in the circuit is connected to Figure 5 The fourth connection terminal K4 in the circuit is connected.

[0048] The specific work process includes: Figure 5 There are multiple switches, including a switch No. 1 composed of a first switch tube Q11 and a second switch tube Q12; a switch No. 2 composed of a third switch tube Q13 and a fourth switch tube Q14; a switch No. 3 composed of a fifth switch tube Q15 and a sixth switch tube Q16; and a switch No. 4 composed of a seventh switch tube Q17 and an eighth switch tube Q18. Among them, the structure in which the switch No. 1 and the switch No. 2 are connected in series is connected in parallel with the structure in which the switch No. 3 and the switch No. 4 are connected in series. Each corresponding switch is connected to a switch circuit, wherein the switch No. 1 is connected to the first switch circuit, the switch No. 2 is connected to the second switch circuit, the switch No. 3 is connected to the third switch circuit, and the switch No. 4 is connected to the fourth switch circuit. The layout and connection relationship of components of the first switch circuit, the second switch circuit, the third switch circuit, and the fourth switch circuit are the same. Taking the first switch circuit as an example, it includes a logic signal interface L1, a current interface A1, a drive signal interface A2, a source voltage interface A3 and a gate voltage interface A4, wherein the logic signal interface L1 is used to receive a logic signal; the current interface A1 is used to connect the battery and receive the corresponding current; the drive signal interface A2 is used to connect the drive circuit and receive the drive signal; the source voltage interface A3 is used to connect the source of the first switch tube Q11 and the second switch tube Q12; the gate voltage interface A4 is used to connect the gate of the first switch tube Q11 and the second switch tube Q12. Figure 3 Shown is a schematic diagram of component connections of a switch circuit provided in an embodiment of the present application.

[0049] The present application also provides an electrical device, the electrical device comprising a power distribution circuit as provided in any one of the above embodiments. Figure 6 Shown is a comparison chart of the conduction time of the electrical device provided in the embodiment of the present application compared with the electrical devices provided in some other embodiments of the present application.

[0050] Depend on Figure 6It can be seen that the first gate voltage Vg1 of the switch in the electric device after adopting the power distribution circuit provided by the above embodiment of the present application can reach the conduction node in 30μs, while the second gate voltage Vg2 of the switch in other electric devices needs 40μs. At the same time, the first source voltage Vs1 of the switch of the electric device in the present application also reaches the conduction node faster than the second source voltage Vs2 of the switch in other electric devices. Therefore, the conduction time of the switch of the electric device after adopting the power distribution circuit provided by the above embodiment of the present application is shorter.

[0051] Depend on Figure 7 It can be known that the first gate voltage Vg1 and the first source voltage Vs1 of the switch of the electrical equipment after adopting the power distribution circuit provided by the above embodiment of the present application can reach equality within 0.6μs, so that the switch is cut off, and then the first gate voltage Vg1 and the first source voltage Vs1 slowly decrease, while the second gate voltage Vg2 of the switch in other electrical equipment decreases slowly. Therefore, the switch of the electrical equipment after adopting the power distribution circuit provided by the above embodiment of the present application has a shorter turn-off time. In summary, the switch of the electrical equipment after adopting the power distribution circuit provided by the above embodiment of the present application not only has a shorter turn-on time, but also a shorter turn-off time.

[0052] The above is a detailed introduction to a power distribution circuit and electrical equipment provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power distribution circuit for power distribution between a battery and a DC module, characterized in that: include: A switch connected between the battery and the DC module; A switch circuit, wherein the switch circuit comprises an energy storage unit, and the energy storage unit is connected between the switch and the battery or the DC module; The switch circuit has a logic input terminal, and the energy storage unit has a signal output terminal, and the signal output terminal is connected to the switch.

2. The power distribution circuit according to claim 1, characterized in that: The energy storage unit includes a second capacitor, and the switch circuit includes a fourth transistor, a first diode, a third diode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a fifth transistor; The base of the fourth transistor is configured to be connected to the logic input end, the collector of the fourth transistor is connected to the cathode of the first diode, the emitter of the fourth transistor is grounded, the anode of the first diode is connected to the third resistor and one end of the fourth resistor, the other end of the third resistor is connected to the base of the fifth transistor, the other end of the fourth resistor is connected to the collector of the fifth transistor and one end of the fifth resistor, the other end of the fifth resistor is connected to the cathode of the third diode, the anode of the third diode is connected to the positive electrode of the battery or the DC module, one end of the fifth resistor is also connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the emitter of the fifth transistor.

3. The power distribution circuit according to claim 1, characterized in that: The switch circuit further comprises a pull-down unit, one end of which is connected to the switch and the other end of which is grounded.

4. The power distribution circuit according to claim 3, characterized in that: The pull-down unit includes a first capacitor and a sixth resistor, the switch circuit includes a first diode, a second transistor and a fourth transistor, the base of the fourth transistor is configured to be connected to the logic input end, the collector of the fourth transistor is connected to the cathode of the first diode, the emitter of the fourth transistor is grounded, the anode of the first diode is connected to one end of the first capacitor, the other end of the first capacitor is connected to the base of the second transistor, the collector of the second transistor is connected to one end of the switch, the emitter of the second transistor is connected to the other end of the switch, one end of the sixth resistor is connected to the emitter of the second transistor, and the other end of the sixth resistor is connected to the collector of the second transistor.

5. The power distribution circuit according to claim 1, wherein: The switch circuit further includes a drive circuit, and the switch circuit includes a first resistor, a second resistor, a first transistor, a second diode, a fifth resistor and a fifth transistor; One end of the first resistor is connected to the driving circuit, the other end of the first resistor is connected to the collector of the first transistor, the second resistor is connected between the base and the collector of the first transistor, the emitter of the first transistor is connected to the anode of the second diode, the cathode of the second diode is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the collector of the fifth transistor, and the emitter of the fifth transistor is connected to the switch.

6. The power distribution circuit according to claim 5, characterized in that: The driving circuit includes a driving chip, the driving chip has a driving output terminal, and the driving output terminal is connected to the first resistor.

7. The power distribution circuit according to claim 2, characterized in that: The switch includes a first switch tube and a second switch tube, the gates of the first switch tube and the second switch tube are both connected to the switch circuit, the drain of the first switch tube is connected to the drain of the second switch tube, the source of the first switch tube is connected to the battery, and the source of the second switch tube is connected to the DC module.

8. The power distribution circuit according to claim 7, characterized in that: The capacitance of the second capacitor is greater than the sum of the capacitance of the gate and the source of the first switch tube and the capacitance of the gate and the source of the second switch tube.

9. The power distribution circuit according to claim 5, characterized in that: There are multiple switches, and the multiple switches are connected in series or in parallel between the battery and the DC module. Each of the switches is connected to the switch circuit, and multiple switch circuits are connected to one drive circuit.

10. An electrical device, characterized in that: The electric device comprises a power distribution circuit as claimed in any one of claims 1 to 9.

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