Soft start circuit for a battery and power supply device

Abstract

The application provides a soft start circuit of a battery and a power supply device. The soft start circuit of the battery comprises a battery cell, a step-down circuit based on an inductance energy storage principle, and a soft start switch circuit. The battery cell is connected to a port of the battery through the step-down circuit, and the step-down circuit is used for outputting a battery cell voltage of the battery cell after step-down processing to the port of the battery. The soft start switch circuit is connected between a positive electrode of the battery cell and a positive electrode port of the battery, and is used for turning on or off a connection line between the positive electrode of the battery cell and the positive electrode port of the battery. The application can reduce the use cost of the battery soft start function.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to a soft-start circuit for a battery and a power supply device. Background Technology

[0002] In the field of energy storage systems, batteries, as one of the core components, need to have a soft-start function to ensure successful activation of the energy storage system. In practical applications, when implementing the soft-start function, a step-down circuit is often used to reduce the voltage output by the battery cells.

[0003] However, current step-down modules typically use resistive step-down circuits. When the resistor in a resistive step-down circuit is connected in series with the battery cell, the high voltage output of the battery cell results in a high resistance power, leading to a significant energy loss and a high cost for the battery soft-start function. Utility Model Content

[0004] In view of this, the embodiments of this application aim to provide a soft-start circuit and power supply device for a battery, so as to solve the problem of high usage cost of the battery soft-start function in the related art.

[0005] This application provides a soft-start circuit for a battery, including: a battery cell, a step-down circuit based on the principle of inductor energy storage, and a soft-start switch circuit;

[0006] The battery cell is connected to the battery port through the step-down circuit, which is used to step down the battery cell voltage and output it to the battery port.

[0007] The soft-start switch circuit is connected between the positive terminal of the battery cell and the positive terminal of the battery, and is used to connect or disconnect the connection line between the positive terminal of the battery cell and the positive terminal of the battery.

[0008] Optionally, the step-down circuit includes a first switching unit, a second switching unit, and a step-down unit;

[0009] The first switching unit is connected between the positive terminal of the battery cell and the input terminal of the step-down unit, and is used to connect or disconnect the connection line between the positive terminal of the battery cell and the input terminal of the step-down circuit.

[0010] The output terminal of the step-down unit is connected to the positive terminal of the battery, and the step-down unit is used to step down the input cell voltage.

[0011] The second switching unit is connected between the negative terminal of the battery cell and the negative terminal of the battery, and is used to connect or disconnect the connection line between the negative terminal of the battery cell and the negative terminal of the battery.

[0012] Optionally, the step-down unit includes a switching transistor, an inductor, and a diode;

[0013] The first terminal of the switching transistor is connected to the first switching unit; the second terminal of the switching transistor is connected to the first terminal of the inductor and the negative terminal of the diode respectively; the control terminal of the switching transistor is used to receive the step-down signal.

[0014] The second end of the inductor is connected to the positive terminal of the battery;

[0015] The positive terminal of the diode is connected to the negative terminal of the battery.

[0016] Optionally, the first switching unit includes a first relay, a first terminal of the first relay is connected to the positive terminal of the battery cell, and a second terminal of the first relay is connected to the first terminal of the switching transistor.

[0017] The second switching unit includes a third relay, the first end of which is connected to the negative terminal of the battery cell, and the second end of which is connected to the negative terminal of the battery.

[0018] Optionally, the soft-start circuit further includes a controller, which is connected to the first switching unit and the second switching unit respectively, for controlling the first switching unit to connect or disconnect the connection line between the positive terminal of the battery cell and the first terminal of the switching transistor, and controlling the second switching unit to connect or disconnect the connection line between the negative terminal of the battery cell and the negative terminal port of the battery.

[0019] Optionally, the soft-start circuit further includes a voltage acquisition circuit, and the controller is connected to both the voltage acquisition circuit and the soft-start switch circuit.

[0020] The voltage acquisition circuit is used to acquire the battery voltage at the port of the battery. The controller is used to receive the battery voltage and control the soft start switch circuit to connect or disconnect the connection line between the positive terminal of the cell (110) and the positive terminal port of the battery.

[0021] Optionally, the soft-start switch circuit includes a second relay, the first end of which is connected to the positive terminal of the battery cell, and the second end of which is connected to the positive terminal of the battery.

[0022] Optionally, the soft-start circuit further includes a first voltage comparator and a second voltage comparator. The first input terminal of the first voltage comparator is connected to the positive terminal of the battery cell to receive the battery cell voltage. The second input terminal of the first voltage comparator is used to receive a reference voltage. The first voltage comparator is used to output a first voltage comparison result based on the battery cell voltage and the reference voltage.

[0023] The first input terminal of the second comparator is connected to the positive terminal of the battery to receive the battery voltage; the second input terminal of the second voltage comparator is used to receive the reference voltage; the second voltage comparator is used to output a second voltage comparison result based on the battery voltage and the reference voltage.

[0024] The first voltage comparison result and the second voltage comparison result are used to indicate whether the soft-start switch circuit connects or disconnects the connection line between the positive terminal of the cell and the positive terminal of the battery.

[0025] Optionally, the soft-start circuit further includes a first voltage comparator and a second voltage comparator. The first input terminal of the first voltage comparator is connected to the positive terminal of the battery cell to receive the battery cell voltage. The second input terminal of the first voltage comparator is used to receive a reference voltage. The first voltage comparator is used to output a first voltage comparison result based on the battery cell voltage and the reference voltage.

[0026] The first input terminal of the second comparator is connected to the positive terminal of the battery to receive the battery voltage; the second input terminal of the second voltage comparator is used to receive the reference voltage; the second voltage comparator is used to output a second voltage comparison result based on the battery voltage and the reference voltage.

[0027] The first voltage comparison result and the second voltage comparison result are used to indicate whether a short circuit has occurred in the battery startup circuit.

[0028] In another aspect, this application provides a power supply device, which includes a soft-start circuit for the battery and an inverter. The soft-start circuit for the battery is connected to a load through the inverter to supply power to the load.

[0029] Compared with related technologies, the soft-start circuit and power supply device for the battery provided in this application have the following advantages:

[0030] The soft-start circuit for a battery provided in this application includes a battery cell, a step-down circuit based on the inductive energy storage principle, and a soft-start switch circuit. The battery cell is connected to the battery port via the step-down circuit, which reduces the cell voltage before outputting it to the battery port. The soft-start switch circuit is connected between the positive terminal of the battery cell and the positive terminal of the battery, used to connect or disconnect the connection between them. Because the step-down circuit reduces the cell voltage based on the inductive energy storage principle before outputting it to the battery port, and the soft-start switch circuit connects the positive terminal of the battery cell to the positive terminal of the battery when the voltage difference between the battery voltage and the cell voltage at the battery port is less than a certain range, the soft-start circuit effectively completes the soft-start of the battery. This avoids the problem of large inrush currents caused by a large voltage difference between the battery voltage and the cell voltage, which could damage the equipment. Furthermore, because a step-down circuit based on the inductive energy storage principle is used, a resistor is not needed to complete the soft-start, avoiding excessive energy consumption and reducing the cost of using the soft-start function. Attached Figure Description

[0031] Figure 1 The diagram shown is a schematic diagram of a soft-start circuit for a battery according to one embodiment.

[0032] Figure 2 The diagram shown is a schematic diagram of the soft-start circuit of another battery provided in one embodiment.

[0033] Figure 3 The diagram shown is a structural schematic of another soft-start circuit for a battery provided in one embodiment.

[0034] Figure 4 The diagram shown is a structural schematic of another soft-start circuit for a battery provided in one embodiment.

[0035] Figure 5 The diagram shown is a schematic diagram of the soft-start circuit of another battery provided in one embodiment.

[0036] Figure 6 The diagram shown is a structural schematic of another soft-start circuit for a battery provided in one embodiment.

[0037] Figure 7 The diagram shown is a structural schematic of a power supply device provided in one embodiment. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] One embodiment of this application provides a soft-start circuit for a battery, such as... Figure 1 As shown, the soft-start circuit 100 of the battery may include: a battery cell 110, a step-down circuit 120 based on the inductor energy storage principle, and a soft-start switch circuit 130. Wherein:

[0041] The battery cell 110 is connected to the battery port through the step-down circuit 120. The step-down circuit 120 is used to step down the cell voltage of the battery cell 110 and output it to the battery port.

[0042] The soft-start switch circuit 130 is connected between the positive terminal a1 of the cell 110 and the positive terminal b1 of the battery, and is used to connect or disconnect the connection line between the positive terminal a1 of the cell 110 and the positive terminal b1 of the battery.

[0043] The step-down circuit 120 based on the inductor energy storage principle can be mainly composed of an inductor and a switching transistor. By controlling the pulse width modulation (PWM) signal with a variable input duty cycle, the switching transistor is switched between on and off states, converting the DC voltage input to the step-down circuit 120 into an adjustable low voltage output.

[0044] It is understood that the soft-start circuit 100 in this embodiment can be equivalent to a battery, with the battery cell 110 providing energy to the battery, and the output terminal of the step-down circuit 120 in the soft-start circuit 100 equivalent to the battery's port. The battery's port can be connected to an external device, through which the battery voltage can be output to power the external device. Specifically, the battery's port can include a positive port and a negative port.

[0045] In practical applications, after the soft-start circuit 100 establishes a connection with the external device, the connection between the positive terminal a1 of the cell 110 and the positive terminal b1 of the battery can be disconnected via the soft-start switch circuit 130 to prepare for the battery soft start. Then, the cell voltage of the cell 110 is stepped down by the step-down circuit 120 based on the inductor energy storage principle and output to the battery port to obtain the battery voltage at the battery port. When the voltage difference between the battery voltage and the cell voltage is less than or equal to the preset voltage difference, the connection between the positive terminal a1 of the cell 110 and the positive terminal b1 of the battery can be reconnected via the soft-start switch circuit 130 to directly output the cell voltage to the external device, thereby completing the battery soft start.

[0046] As can be seen, in this embodiment, the soft-start circuit 100 of the battery includes a battery cell 110, a step-down circuit 120 based on the inductor energy storage principle, and a soft-start switch circuit 130. The battery cell 110 is connected to the battery port through the step-down circuit 120, which is used to step down the battery cell voltage of the battery cell 110 and output it to the battery port. The soft-start switch circuit 130 is connected between the positive terminal a1 of the battery cell 110 and the positive terminal b1 of the battery, and is used to connect or disconnect the connection line between the positive terminal a1 of the battery cell 110 and the positive terminal b1 of the battery. Since the step-down circuit 120 can step down the cell voltage of the battery cell 110 based on the inductive energy storage principle and output it to the battery port, and then the soft-start switch circuit 130 connects the connection line between the positive terminal a1 of the battery cell 110 and the positive terminal b1 of the battery when the voltage difference between the battery voltage and the cell voltage at the battery port is less than a certain range, the soft-start switch circuit 130 effectively completes the soft start of the battery. This avoids the problem of a large inrush current caused by a large voltage difference between the battery voltage and the cell voltage, which could damage the equipment. In addition, since the step-down circuit 120 based on the inductive energy storage principle is used, there is no need to introduce a resistor to complete the soft start of the battery, avoiding the problem of large energy consumption and reducing the cost of using the soft start function.

[0047] In some implementations, such as Figure 2 As shown, the step-down circuit 220 may include a first switching unit 221, a second switching unit 222, and a step-down unit 223. Wherein:

[0048] The first switching unit 221 is connected between the positive terminal a1 of the battery cell 210 and the input terminal of the step-down unit 223, and is used to connect or disconnect the connection line between the positive terminal a1 of the battery cell 210 and the input terminal of the step-down circuit 220.

[0049] The output terminal of the step-down unit 223 is connected to the positive terminal b1 of the battery. The step-down unit 223 is used to step down the input cell voltage.

[0050] The second switch unit 222 is connected between the negative terminal a2 of the cell 210 and the negative terminal b2 of the battery, and is used to connect or disconnect the connection line between the negative terminal a2 of the cell 210 and the negative terminal b2 of the battery.

[0051] Optionally, the first switching unit 221 can be connected between the output terminal of the step-down unit 223 and the positive terminal b1 of the battery, for connecting or disconnecting the connection line between the output terminal of the step-down unit 223 and the positive terminal b1 of the battery.

[0052] Optionally, the step-down unit 223 can be a DC-DC converter (BUCK circuit) based on the principle of inductor energy storage, used to step down the cell voltage input to the input terminal of the step-down unit 223 when the first switch unit 221 is in the ON state, and then output it to the positive terminal b1 of the battery through the output terminal of the step-down unit 223.

[0053] In practical applications, when it is necessary to detect a short circuit in the battery's soft-start circuit 200, the connection between the positive terminal a1 of the cell 210 and the input terminal of the step-down circuit 220 can be connected through the first switch unit 221, and the connection between the negative terminal a2 of the cell 210 and the negative terminal b2 of the battery can be connected through the second switch unit 222. Then, the battery voltage at the battery port is collected, and the battery voltage and cell voltage are used to determine whether the battery's soft-start circuit 200 is short-circuited. For example, when the battery voltage at the battery port is detected to be close to the cell voltage, it can be determined that the battery's soft-start circuit 200 is not short-circuited; when the battery voltage at the battery port is detected to be close to 0, it can be determined that the battery's soft-start circuit 200 has short-circuited.

[0054] When the battery is connected to a load and a soft-start action is required, the connection between the positive terminal a1 of the cell 210 and the input terminal of the step-down circuit 220 can be connected through the first switch unit 221, and the connection between the negative terminal a2 of the cell 210 and the negative terminal b2 of the battery can be connected through the second switch unit 222. Then, the cell voltage is stepped down by the step-down unit 223 and output to the battery port to achieve a soft start.

[0055] When the load does not need to use the battery, the connection between the positive terminal a1 of the cell 210 and the input terminal of the step-down circuit 220 can be disconnected by the first switch unit 221, and the connection between the negative terminal a2 of the cell 210 and the negative terminal b2 of the battery can be disconnected by the second switch unit 222, so that both the positive terminal a1 and the negative terminal of the cell 210 are in a disconnected state, realizing global power off and improving the safety of battery use.

[0056] In some implementations, such as Figure 3 As shown, the step-down unit 300 includes a switching transistor Q1, an inductor L1, and a diode D1. Wherein:

[0057] The first terminal of the switching transistor Q1 is connected to the first switching unit 321; the second terminal of the switching transistor Q1 is connected to the first terminal of the inductor L1 and the negative terminal a2 of the diode D1 respectively; the control terminal of the switching transistor Q1 is used to receive the step-down signal.

[0058] The second terminal of inductor L1 is connected to the positive terminal b1 of the battery.

[0059] The positive terminal a1 of diode D1 is connected to the negative terminal b2 of the battery.

[0060] The step-down signal can be a variable duty cycle PWM signal, used to control the switching transistor Q1 to switch between the on state (i.e., the first terminal of the switching transistor Q1 and the second terminal of the switching transistor Q1 are connected) and the off state, so as to realize the step-down processing of the cell voltage.

[0061] As an example, the buck unit 300 may include the following stages during operation:

[0062] Conduction phase: When the switching transistor Q1 is turned on, the inductor L1 stores electrical energy and the capacitor is charged.

[0063] Turn-off phase: When the switching transistor Q1 is turned off, the current in the inductor L1 still exists and continues to flow to the load.

[0064] Freewheel oscillation stage: After the current flows from inductor L1 to the load, the switching transistor Q1 is turned off. At this time, the current in inductor L1 cannot disappear immediately. Therefore, the energy in inductor L1 will be transferred back to the switching transistor Q1, driving its diode to conduct. This process is called freewheel oscillation.

[0065] Repeating phase: The above three phases are repeated. The duty cycle of the control switch transistor Q1 can be adjusted by the PWM controller to achieve a stable output voltage through buck conversion.

[0066] In some implementations, to ensure a stable output voltage, the buck unit 300 may employ negative feedback control. For example, by sampling the output battery voltage and feeding the battery voltage back to the microcontroller, the microcontroller adjusts the duty cycle of the output PWM signal to control the on-time and off-time of the switching transistor Q1, so that the output voltage is kept within a predetermined range to output a stable voltage.

[0067] In some implementations, the buck signal can be determined based on the load conditions of the battery connected to the load. For example, when the load power is large, the buck power of the buck unit 300 can be increased by adjusting the buck signal, so that the battery can complete the soft start more quickly and improve the soft start efficiency.

[0068] In some implementations, such as Figure 4 As shown, the first switching unit 421 includes a first relay k1, the first end of the first relay k1 is connected to the positive terminal a1 of the battery cell 410, and the second end of the first relay k1 is connected to the first end of the switching transistor Q1.

[0069] The second switching unit 422 includes a third relay k3. The first end of the third relay k3 is connected to the negative terminal a2 of the battery cell 410, and the second end of the third relay k3 is connected to the negative terminal b2 of the battery.

[0070] In some implementations, the soft-start switch circuit 430 includes a second relay k2, the first end of which is connected to the positive terminal a1 of the battery cell 410, and the second end of which is connected to the positive terminal b1 of the battery.

[0071] Optionally, the first switching unit 421, the second switching unit 422, and the soft-start switching circuit 430 can be relays, or they can be transistor switching circuits, such as metal-oxide-semiconductor field-effect transistor (MOSFET) switching circuits, bipolar transistor switching circuits, etc., without limitation.

[0072] The first switch unit 421, the second switch unit 422, and the soft-start switch circuit 430 can be switched by their own integrated controller or by an externally connected controller; no limitation is made here.

[0073] In some implementations, such as Figure 5As shown, the soft-start circuit 500 may further include a controller 540, which is connected to the first switch unit 521 and the second switch unit 522 respectively. The controller 540 is used to control the first switch unit 521 to connect or disconnect the connection line between the positive terminal a1 of the cell 510 and the first terminal of the switching transistor Q1, and to control the second switch unit 522 to connect or disconnect the connection line between the negative terminal a2 of the cell 510 and the negative terminal b2 of the battery.

[0074] Optionally, the controller 540 may be a microcontroller (MCU), a digital signal controller (DSC), a system-on-a-chip (SoC), etc., and there is no limitation here.

[0075] As an example, in practical applications, when the battery is connected to a load, if the controller 540 receives a charging command, it can send a first control signal to the first switching unit 521 and the second switching unit 522 respectively. The first control signal can instruct the first switching unit 521 to connect the connection line between the positive terminal a1 of the battery cell 510 and the first terminal of the switching transistor Q1, and instruct the second switching unit 522 to connect the connection line between the negative terminal a2 of the battery cell 510 and the negative terminal b2 of the battery, so as to continue to perform the soft start action through the step-down circuit and the soft start switch.

[0076] If the controller 540 receives a power-off command, it can send a second control signal to the first switch unit 521 and the second switch unit 522 respectively. The second control signal can instruct the first switch unit 521 to disconnect the connection line between the positive terminal a1 of the cell 510 and the first terminal of the switching transistor Q1, and instruct the second switch unit 522 to disconnect the connection line between the negative terminal a2 of the cell 510 and the negative terminal b2 of the battery, thereby realizing the global power-off of the battery.

[0077] In some embodiments, the soft-start circuit 500 may further include a voltage acquisition circuit, and the controller 540 is connected to both the voltage acquisition circuit and the soft-start switch circuit 530.

[0078] The voltage acquisition circuit is used to acquire the battery voltage at the battery port. The controller 540 is used to receive the battery voltage and control the soft start switch circuit 530 to connect or disconnect the connection line between the positive terminal a1 of the cell 510 and the positive terminal b1 of the battery.

[0079] Optionally, the voltage acquisition circuit can be a resistor divider voltage acquisition circuit, for example, using two resistors to divide the battery voltage to a suitable low voltage range before acquiring the voltage. Optionally, the voltage acquisition circuit can also be an operational amplifier isolated voltage acquisition circuit, specifically, an operational amplifier (such as OP07) can be used to amplify or attenuate the battery voltage before acquisition.

[0080] In practical applications, the controller 540 can calculate the voltage difference between the battery voltage and the cell voltage. If the voltage difference is within a specified range, such as less than or equal to a voltage difference threshold, the controller can control the soft-start switch circuit 530 to connect the connection line between the positive terminal a1 of the cell 510 and the positive terminal b1 of the battery, thereby completing the battery soft start. If the voltage difference is greater than the voltage difference threshold, the controller can control the soft-start switch circuit 530 to disconnect the connection line between the positive terminal a1 of the cell 510 and the positive terminal b1 of the battery. This is to avoid a large inrush current that could damage the equipment if the connection line between the positive terminal a1 of the cell 510 and the positive terminal b1 of the battery is connected when there is a large voltage difference between the battery port and the cell 510, thus ensuring the safety of battery use.

[0081] In some implementations, such as Figure 6 As shown, the soft-start circuit 600 may also include a first voltage comparator 650 and a second voltage comparator 660. The first input terminal of the first voltage comparator 650 is connected to the positive terminal a1 of the battery cell 610 to receive the battery cell voltage. The second input terminal of the first voltage comparator 650 is used to receive a reference voltage. The first voltage comparator 650 is used to output a first voltage comparison result based on the battery cell voltage and the reference voltage.

[0082] The first input terminal of the second comparator is connected to the positive terminal b1 of the battery to receive the battery voltage; the second input terminal of the second voltage comparator 660 is used to receive the reference voltage; the second voltage comparator 660 is used to output the second voltage comparison result based on the battery voltage and the reference voltage.

[0083] The first voltage comparison result and the second voltage comparison result are used to indicate whether the soft-start switch circuit connects or disconnects the connection line between the positive terminal a1 of cell 610 and the positive terminal b1 of the battery.

[0084] The reference voltage can be customized according to actual needs, and is not limited here.

[0085] As an example, in practical applications, the first voltage comparator 650 can compare the cell voltage V1 with the reference voltage V0 to obtain a first voltage comparison result; the second voltage comparator 660 can compare the battery voltage V2 with the reference voltage V0 to obtain a second voltage comparison result. Since neither the battery voltage V2 nor the cell voltage V1 can exceed the rated voltage of the cell 610, if the first voltage comparison result indicates that the cell voltage V1 is greater than the reference voltage V0, and the second voltage comparison result indicates that the battery voltage V2 is greater than the reference voltage V0, it indicates that the voltage difference between the cell voltage V1 and the battery voltage V2 is within the specified voltage difference range, thereby instructing the soft-start switch circuit to connect the connection line between the positive terminal a1 of the cell 610 and the positive terminal b1 of the battery.

[0086] If either the cell voltage V1 or the battery voltage V2 is less than the reference voltage V0, it indicates that the voltage difference between the cell voltage V1 and the battery voltage V2 is not within the specified voltage difference range, thereby instructing the soft-start switch circuit to disconnect the connection line between the positive terminal a1 of the cell 610 and the positive terminal b1 of the battery.

[0087] In some implementations, such as Figure 6 As shown, the soft-start circuit 600 also includes a first voltage comparator 650 and a second voltage comparator 660. The first input terminal of the first voltage comparator 650 is connected to the positive terminal a1 of the battery cell 610 and is used to receive the battery cell voltage. The second input terminal of the first voltage comparator 650 is used to receive a reference voltage. The first voltage comparator 650 is used to output a first voltage comparison result based on the battery cell voltage and the reference voltage.

[0088] The first input terminal of the second comparator is connected to the positive terminal b1 of the battery to receive the battery voltage; the second input terminal of the second voltage comparator 660 is used to receive the reference voltage; the second voltage comparator 660 is used to output the second voltage comparison result based on the battery voltage and the reference voltage.

[0089] The first voltage comparison result and the second voltage comparison result are used to indicate whether a short circuit has occurred in the battery startup circuit.

[0090] As an example, in practical applications, if both the cell voltage V1 and the battery voltage V2 are greater than the reference voltage V0, it indicates that the voltage difference between the cell voltage V1 and the battery voltage V2 is small, thus confirming that there is no short circuit in the battery starting circuit.

[0091] As can be seen, in this embodiment, the soft-start function and short-circuit detection of the soft-start circuit are realized by using a simple voltage comparator, which can effectively reduce the cost of the soft-start circuit.

[0092] One embodiment of this application provides a power supply device, such as... Figure 7 As shown, the power supply device may include a soft-start circuit 700 for the battery provided in any of the above embodiments and an inverter 800. The soft-start circuit 700 for the battery is connected to the load through the inverter 800 to supply power to the load.

[0093] The power supply device provided in this embodiment can prevent a voltage difference between the battery port and the cell voltage during battery soft-start via the soft-start circuit 700. This avoids the possibility of a large inrush current being generated when the second relay k2 is closed, which could potentially damage the internal semiconductors of the inverter 800, thus ensuring equipment safety. Furthermore, the step-down circuit in the soft-start circuit 700 uses inductive energy storage to reduce voltage, eliminating the need for resistors, avoiding energy loss, and reducing operating costs.

[0094] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A soft-start circuit for a battery, characterized in that, include: Battery cells, step-down circuits based on inductor energy storage principle, and soft-start switch circuits; The battery cell is connected to the battery port through the step-down circuit, which is used to step down the battery cell voltage and output it to the battery port. The soft-start switch circuit is connected between the positive terminal of the battery cell and the positive terminal of the battery, and is used to connect or disconnect the connection line between the positive terminal of the battery cell and the positive terminal of the battery.

2. The soft-start circuit for the battery according to claim 1, characterized in that, The step-down circuit includes a first switching unit, a second switching unit, and a step-down unit; The first switching unit is connected between the positive terminal of the battery cell and the input terminal of the step-down unit, and is used to connect or disconnect the connection line between the positive terminal of the battery cell and the input terminal of the step-down circuit. The output terminal of the step-down unit is connected to the positive terminal of the battery, and the step-down unit is used to step down the input cell voltage. The second switching unit is connected between the negative terminal of the battery cell and the negative terminal of the battery, and is used to connect or disconnect the connection line between the negative terminal of the battery cell and the negative terminal of the battery.

3. The soft-start circuit for the battery according to claim 2, characterized in that, The step-down unit includes a switching transistor, an inductor, and a diode; The first terminal of the switching transistor is connected to the first switching unit; the second terminal of the switching transistor is connected to the first terminal of the inductor and the negative terminal of the diode, respectively; the control terminal of the switching transistor is used to receive a step-down signal. The second end of the inductor is connected to the positive terminal of the battery; The positive terminal of the diode is connected to the negative terminal of the battery.

4. The soft-start circuit for the battery according to claim 3, characterized in that, The first switching unit includes a first relay, a first terminal of which is connected to the positive terminal of the battery cell, and a second terminal of which is connected to the first terminal of the switching transistor. The second switching unit includes a third relay, the first end of which is connected to the negative terminal of the battery cell, and the second end of which is connected to the negative terminal of the battery.

5. The soft-start circuit for the battery according to claim 2, characterized in that, It also includes a controller, which is connected to the first switching unit and the second switching unit respectively, for controlling the first switching unit to connect or disconnect the connection line between the positive terminal of the battery cell and the first terminal of the switching transistor, and controlling the second switching unit to connect or disconnect the connection line between the negative terminal of the battery cell and the negative terminal port of the battery.

6. The soft-start circuit for a battery according to claim 5, characterized in that, It also includes a voltage acquisition circuit, and the controller is connected to the voltage acquisition circuit and the soft-start switch circuit respectively; The voltage acquisition circuit is used to acquire the battery voltage at the battery port, and the controller is used to receive the battery voltage and control the soft-start switch circuit to connect or disconnect the connection line between the positive terminal of the cell and the positive terminal of the battery.

7. The soft-start circuit for a battery according to claim 1, characterized in that, The soft-start switch circuit includes a second relay, the first end of which is connected to the positive terminal of the battery cell, and the second end of which is connected to the positive terminal of the battery.

8. The soft-start circuit for a battery according to any one of claims 1 to 7, characterized in that, It also includes a first voltage comparator and a second voltage comparator. The first input terminal of the first voltage comparator is connected to the positive terminal of the battery cell to receive the battery cell voltage. The second input terminal of the first voltage comparator is used to receive a reference voltage. The first voltage comparator is used to output a first voltage comparison result based on the battery cell voltage and the reference voltage. The first input terminal of the second comparator is connected to the positive terminal of the battery to receive the battery voltage; the second input terminal of the second voltage comparator is used to receive the reference voltage. The second voltage comparator is used to output a second voltage comparison result based on the battery voltage and the reference voltage; The first voltage comparison result and the second voltage comparison result are used to indicate whether the soft-start switch circuit connects or disconnects the connection line between the positive terminal of the cell and the positive terminal of the battery.

9. The soft-start circuit for a battery according to any one of claims 1 to 7, characterized in that, It also includes a first voltage comparator and a second voltage comparator. The first input terminal of the first voltage comparator is connected to the positive terminal of the battery cell to receive the battery cell voltage. The second input terminal of the first voltage comparator is used to receive a reference voltage. The first voltage comparator is used to output a first voltage comparison result based on the battery cell voltage and the reference voltage. The first input terminal of the second comparator is connected to the positive terminal of the battery to receive the battery voltage; the second input terminal of the second voltage comparator is used to receive the reference voltage. The second voltage comparator is used to output a second voltage comparison result based on the battery voltage and the reference voltage; The first voltage comparison result and the second voltage comparison result are used to indicate whether a short circuit has occurred in the battery startup circuit.

10. A power supply device, characterized in that, The power supply device includes a soft-start circuit for the battery as described in any one of claims 1 to 9 and an inverter, wherein the soft-start circuit for the battery is connected to the load through the inverter to supply power to the load.

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