A charging and discharging circuit and a bidirectional DC-DC converter

Abstract

This invention provides a charging / discharging circuit and a bidirectional DC-DC converter, relating to the field of electronic power technology. The charging / discharging circuit has a power supply terminal, an enable terminal for connection to the output terminal of a mode controller, and a signal input terminal for connection to the output terminal of a signal controller. The charging / discharging circuit includes: a battery module; a control circuit, whose control terminal is connected to the signal input terminal, and the control circuit is used to control the operating parameters during the charging or discharging process according to the PWM signal input at the signal input terminal; a first selection circuit, which is connected between the power supply terminal and the first signal terminal of the control circuit, and whose control terminal is connected to the enable terminal; and a second selection circuit, which is connected between the battery module and the second signal terminal of the control circuit, and whose control terminal is connected to the enable terminal. Both the first and second selection circuits are used to charge or discharge the battery module under the control of the mode control signal input at the enable terminal. This invention simplifies the circuit structure.

Description

Technical Field

[0001] This utility model relates to the field of electronic power technology, and in particular to a charging and discharging circuit and a bidirectional DC-DC converter. Background Technology

[0002] Currently, DC-DC converters achieve charging and discharging by configuring buck and boost chopper circuits. Commonly, the buck and boost chopper circuits operate independently or are integrated into a single circuit. However, when the buck chopper circuit charges the battery energy storage component, constant power charging is required. Constant power mode directly responds to grid commands, ensuring the energy storage system stably outputs or absorbs energy at a specified power, avoiding power fluctuations caused by current control, and thus reducing the impact of load power fluctuations on grid voltage frequency. The constant power charging process consists of four stages: trickle charging, constant current charging, constant voltage charging, and full charge. When the boost chopper circuit discharges the battery energy storage component, constant voltage discharge is essential. This is because the battery output needs to be connected to the grid or load during discharge, and the grid has strict requirements for voltage stability (e.g., ±1% fluctuation). Constant voltage discharge ensures the output voltage remains at a set value (e.g., 48V, 400V), preventing equipment damage or grid connection failure due to voltage fluctuations. Therefore, the circuit structure inside a DC-DC converter is relatively complex. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a charging and discharging circuit and a bidirectional DC-DC converter, which simplifies the circuit structure while meeting the voltage and power requirements of the bidirectional DC-DC converter during charging and discharging.

[0004] In a first aspect, embodiments of this application provide a charging and discharging circuit, the charging and discharging circuit having a power supply terminal for connection to an external power source, an enable terminal for connection to the output terminal of a mode controller, and a signal input terminal for connection to the output terminal of a signal controller; the charging and discharging circuit includes: Battery module; A control circuit, the control terminal of which is connected to the signal input terminal, is used to control the operating parameters during the charging or discharging process according to the PWM signal input to the signal input terminal; A first selection circuit is connected between the power supply terminal and the first signal terminal of the control circuit, and its control terminal is connected to the enable terminal. The second selection circuit is connected between the battery module and the second signal terminal of the control circuit, and its control terminal is connected to the enable terminal. Both the first selection circuit and the second selection circuit are used to charge or discharge the battery module under the control of the mode control signal input at the enable terminal.

[0005] In some embodiments, the control circuit includes: The first signal modulation module has its input terminal connected to the first signal terminal of the control circuit, its output terminal connected to the second signal terminal of the control circuit, and its control terminal connected to the signal input terminal. The second signal modulation module has its input terminal connected to the second signal terminal of the control circuit, its output terminal connected to the first signal terminal of the control circuit, and its control terminal connected to the signal input terminal.

[0006] In some embodiments, the first selection circuit includes: First inverter; The first switching module has its control terminal connected to the enable terminal, its first voltage terminal connected to the high potential terminal of the power supply terminal, and its second voltage terminal connected to the input terminal of the first signal modulation module. The second switching module has its control terminal connected to the enable terminal via the first inverter, its first voltage terminal connected to the low potential terminal of the power supply terminal and the output terminal of the second signal modulation module, and its second voltage terminal connected to the input terminal of the first signal modulation module. The first selection circuit is configured to control the first switching module to turn on when the mode control signal is a charging signal, or to control the second switching module to turn on when the mode control signal is a discharging signal.

[0007] In some embodiments, the second selection circuit includes: Second inverter; The third switch module has its control terminal connected to the enable terminal, its first voltage terminal connected to the second signal terminal of the control circuit, and its second voltage terminal connected to the first voltage terminal of the battery module. The fourth switch module has its control terminal connected to the enable terminal via the second inverter, its first voltage terminal connected to the second signal terminal of the control circuit, and its second voltage terminal connected to the first voltage terminal of the battery module. The second selection circuit is configured to control the third switch module to turn on when the charging signal is input at the enable terminal, or to control the fourth switch module to turn on when the discharging signal is input at the enable terminal.

[0008] In some embodiments, the second selection circuit further includes: The first inductor is connected between the first voltage terminal of the third switching module and the second signal terminal of the control circuit. The second inductor is connected between the first voltage terminal of the fourth switching module and the second signal terminal of the control circuit. A first capacitor is connected in parallel across the two ends of the battery module, and the second voltage terminal of the battery module is connected to the output terminal of the second signal modulation module.

[0009] In some embodiments, the charging and discharging circuit further includes: The load module is connected between the first voltage terminal of the second switching module and the output terminal of the second signal modulation module.

[0010] In some embodiments, the load module includes: A resistor is connected between the first voltage terminal of the second switching module and the output terminal of the second signal modulation module; The second capacitor is connected in parallel across the two ends of the resistor.

[0011] In some embodiments, the first switch module, the second switch module, the third switch module, and the fourth switch module are all silicon controlled diodes.

[0012] In some embodiments, the first signal modulation module and the second signal modulation module are insulated gate bipolar transistors.

[0013] Secondly, embodiments of this application provide a bidirectional DC-DC converter, including: a charging and discharging circuit as described in the above embodiments.

[0014] The charging / discharging circuit and bidirectional DC-DC converter provided in this application embodiment, by configuring a first selection circuit between the power supply terminal and the control circuit, and a second selection circuit between the battery module and the control circuit, charge or discharge the battery module under the control of the mode control signal output by the mode controller. By configuring the control circuit, the operating parameters during the charging or discharging process are controlled according to the PWM signal output by the signal controller, which can meet the voltage and power requirements of the bidirectional DC-DC converter during the charging and discharging process. At the same time, the switching of charging and discharging is realized by controlling the on and off of the circuit elements in the first and second selection circuits, simplifying the circuit structure and improving the flexibility of the circuit structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a charging and discharging circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of a charging and discharging circuit provided for an exemplary embodiment of this application. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Figure 1 This is a schematic diagram of a charging and discharging circuit provided in an embodiment of this application. The charging and discharging circuit 10 has a power supply terminal for connection to an external power source, an enable terminal for connection to the output terminal of a mode controller, and a signal input terminal for connection to the output terminal of a signal controller. The charging and discharging circuit 10 includes: Battery module 14; The control circuit 12 has its control terminal connected to the signal input terminal. The control circuit 12 is used to control the operating parameters during the charging or discharging process according to the PWM signal input to the signal input terminal. The first selection circuit 11 is connected between the power supply terminal and the first signal terminal of the control circuit 12, and its control terminal is connected to the enable terminal. The second selection circuit 13 is connected between the battery module 14 and the second signal terminal of the control circuit 12, and its control terminal is connected to the enable terminal. The first selection circuit 11 and the second selection circuit 13 are both used to charge or discharge the battery module under the control of the mode control signal input at the enable terminal.

[0018] In this application, the mode controller can be an electronic device that controls the operating state (i.e., charging state and discharging state) of the charging and discharging circuit. The enable terminal is the input terminal of the mode control signal, which includes a charging signal and a discharging signal. For example, the mode controller controls the charging and discharging state of the charging and discharging circuit by outputting high and low level signals. For instance, if the mode control signal is a charging signal (set to 1), the charging and discharging circuit is in the charging state to charge the battery module; if the mode control signal is a discharging signal (set to 0), the charging and discharging circuit is in the discharging state to discharge the battery module. Therefore, this application uses the mode control signal to control a first selection circuit and a second selection circuit to achieve the switching between charging and discharging.

[0019] The signal controller can be an electronic device that generates and outputs a PWM (Pulse Width Modulation) signal. This PWM signal controls the average power or voltage of the output signal by adjusting the duty cycle of the pulse signal (i.e., the ratio of the high-level time to the period). Therefore, this application uses PWM (Pulse Width Modulation) signals to control the output power or voltage, achieving efficient and flexible bidirectional switching between buck and boost modes.

[0020] In this application, the first selection circuit 11 is connected between the power supply terminal and the control circuit 12, and the second selection circuit 13 is connected between the battery module 14 and the control circuit 12. This allows the circuit elements in the first and second selection circuits 11 and 13 to be switched on and off under the influence of a mode control signal, changing the current path and thus achieving voltage boosting or bucking to meet different charging and discharging requirements. Simultaneously, this application adjusts the PWM signal through the control circuit to control operating parameters (such as current, voltage, and / or power) to meet charging and discharging requirements, achieving automatic switching of circuit modes.

[0021] On the one hand, when charging the battery module, under the action of the mode control signal being a charging signal, the first selection circuit and the second selection circuit switch to a circuit structure for charging, so that the current path is that the current flows from the external power source through the first selection circuit, the control circuit, and the second selection circuit to the battery module, thus achieving charging. On the other hand, when discharging the battery module, under the action of the mode control signal being a discharging signal, the first selection circuit and the second selection circuit switch to a circuit structure for discharging, so that the current path is that the current flows from the battery module through the second selection circuit, the control circuit, and the first selection circuit to supply power to the outside, thus achieving discharging.

[0022] The charging / discharging circuit and bidirectional DC-DC converter provided in this application embodiment, by configuring a first selection circuit between the power supply terminal and the control circuit, and a second selection circuit between the battery module and the control circuit, charge or discharge the battery module under the control of the mode control signal output by the mode controller. By configuring the control circuit, the operating parameters during the charging or discharging process are controlled according to the PWM signal output by the signal controller, which can meet the voltage and power requirements of the bidirectional DC-DC converter during the charging and discharging process. At the same time, the switching of charging and discharging is realized by controlling the on and off of the circuit elements in the first and second selection circuits, simplifying the circuit structure and improving the flexibility of the circuit structure.

[0023] In some embodiments, Figure 2 This is a schematic diagram of a charging and discharging circuit provided in an exemplary embodiment of this application. The control circuit 12 includes: The first signal modulation module Q1 has its input terminal connected to the first signal terminal of the control circuit 12, its output terminal connected to the second signal terminal of the control circuit 12, and its control terminal connected to the signal input terminal. The second signal modulation module Q2 has its input terminal connected to the second signal terminal of the control circuit 12, its output terminal connected to the first signal terminal of the control circuit 12, and its control terminal connected to the signal input terminal.

[0024] Based on the above embodiments, in some embodiments, the first signal modulation module Q1 and the second signal modulation module Q2 are insulated gate bipolar transistors.

[0025] Specifically, the first signal modulation module Q1 can be an IGBT, and the second signal modulation module Q2 can be an IGBT. In this embodiment, the voltage of the input signal to the control terminal of the first signal modulation module Q1 controls the on and off states of the first signal modulation module Q1, and the voltage of the input signal to the control terminal of the second signal modulation module Q2 controls the on and off states of the second signal modulation module Q2. For example, as... Figure 2 As shown, the first signal modulation module Q1 is an IGBT, with its control terminal being the gate (g), its input terminal being the collector (C), and its output terminal being the emitter (E). The IGBT controls its turn-on and turn-off through the gate voltage. Similarly, the second signal modulation module Q2 is an IGBT, with its control terminal being the gate (g), its input terminal being the collector (C), and its output terminal being the emitter (E).

[0026] More specifically, the control terminals of the first signal modulation module Q1 and the second signal modulation module Q2 are used to input PWM signals to regulate the power and voltage during charging / discharging. Furthermore, the input terminal of the first signal modulation module Q1 and the output terminal of the second signal modulation module Q2 are connected to the first signal terminal of the control circuit 12, and the output terminal of the first signal modulation module Q1 and the input terminal of the second signal modulation module Q2 are connected to the second signal terminal of the control circuit 12. Thus, during charging, by controlling the current paths in the first selection circuit 11 and the second selection circuit 13, the first signal modulation module Q1 is turned on, while the second signal modulation module Q2 is turned off. Current flows from the first signal modulation module Q1 through the first selection circuit 11 to the second selection circuit 13, that is, it flows into the first signal terminal (i.e., the input terminal of the first signal modulation module) of the control circuit 12 and flows out through the second signal terminal (i.e., the output terminal of the first signal modulation module) of the control circuit 12, thereby charging the battery module 14. During discharge, by controlling the current path in the first selection circuit 11 and the second selection circuit 13, the second signal modulation module Q2 is turned on while the first signal modulation module Q1 is turned off. The current flows from the second selection circuit 13 to the first selection circuit 11 through the second signal modulation module Q2, that is, it flows into the second signal terminal of the control circuit 12 (i.e., the input terminal of the second signal modulation module) and flows out at the first signal terminal of the control circuit 12 (i.e., the output terminal of the second signal modulation module), thereby discharging the battery module 14.

[0027] Therefore, this embodiment uses PWM signals input to the first and second signal modulation modules to adjust the power and voltage during charging / discharging to meet the requirements of charging and discharging. Simultaneously, by configuring the connection structure of the first and second signal modulation modules, the current path is changed, thereby achieving voltage boost or buck to adapt to different charging and discharging needs and simplify the circuit structure.

[0028] In some embodiments, such as Figure 2 As shown, the first selection circuit 11 includes: First inverter A1; The first switch module M1 has its control terminal connected to the enable terminal, its first voltage terminal connected to the high potential terminal of the power supply terminal, and its second voltage terminal connected to the input terminal of the first signal modulation module Q1. The second switch module M2 has its control terminal connected to the enable terminal via the first inverter A1, its first voltage terminal connected to the low potential terminal of the power supply terminal and the output terminal of the second signal modulation module Q2, and its second voltage terminal connected to the input terminal of the first signal modulation module Q1. The first selection circuit 11 is configured to control the first switch module M1 to turn on when the mode control signal is a charging signal, or to control the second switch module M2 to turn on when the mode control signal is a discharging signal.

[0029] Optionally, the first switch module M1 and the second switch module M2 are thyristor diodes, and precise control of conduction and turn-off is achieved by controlling the control electrode signal of the thyristor diode. For example, when a forward voltage is applied between the anode and cathode and a forward trigger pulse is input to the control electrode, the thyristor switches from the blocking state to the conducting state, and a reverse voltage is applied to turn it off.

[0030] An inverter inverts the level of an input signal, i.e., a high input level results in a low output level, and a low input level results in a high output level. The control terminals of both the first switch module M1 and the second switch module M2 are connected to the enable terminal to acquire the mode control signal. For example, as shown... Figure 2 As shown, the enable terminal is represented by [A]. The control terminal (g) of the first switch module M1 is connected to the enable terminal ([A]), and the control terminal (g) of the second switch module M2 is also connected to the enable terminal ([A]). Specifically, when the mode control signal is a charging signal, the first switch module M1 is turned on. At this time, the mode control signal is inverted by the first inverter A1, and the second switch module M2 is turned off. When the mode control signal is a discharging signal, the first switch module M1 is turned off. At this time, the mode control signal is inverted by the first inverter A1, and the second switch module M2 is turned on. Therefore, this embodiment, by configuring the first inverter in the first selection circuit, enables the first switch module and the second switch module to be turned on separately, that is, only one switch module is turned on at the same time, while the other switch module is turned off, thereby controlling the current path under charging / discharging.

[0031] In this embodiment, the first voltage terminal of the first switch module M1 is connected to the high-potential terminal of the power supply, and the second voltage terminal (negative terminal) of the battery module 14 is connected to the low-potential terminal of the power supply. This allows the first switch module M1 to conduct during charging, enabling current to flow from the high-potential terminal of the power supply into the circuit, thus charging the battery module 14. The first voltage terminal of the second switch module M2 is connected to the low-potential terminal of the power supply, allowing the second switch module M2 to conduct during discharging, supplying power to the external circuit through its first voltage terminal.

[0032] Therefore, this embodiment configures a first switch module and a second switch module in the first selection circuit, and controls the on / off state after responding to the mode control signal input at the enable terminal. By changing the current path through different switch combinations, the voltage can be boosted or bucked to adapt to different charging and discharging needs, while simplifying the circuit structure.

[0033] In some embodiments, such as Figure 2 As shown, the second selection circuit 13 includes: Second inverter A2; The third switch module M3 has its control terminal connected to the enable terminal, its first voltage terminal connected to the second signal terminal of the control circuit 12, and its second voltage terminal connected to the first voltage terminal of the battery module 14. The fourth switch module M4 has its control terminal connected to the enable terminal via the second inverter A2, its first voltage terminal connected to the second signal terminal of the control circuit 12, and its second voltage terminal connected to the first voltage terminal of the battery module 14. The second selection circuit 13 is configured to control the third switch module M3 to turn on when the charging signal is input at the enable terminal, or to control the fourth switch module M4 to turn on when the discharging signal is input at the enable terminal.

[0034] Optionally, the third switch module M3 and the fourth switch module M4 are thyristor diodes, and precise control of conduction and turn-off is achieved by controlling the control electrode signal of the thyristor diode.

[0035] In this embodiment, the control terminals of the third switch module M3 and the fourth switch module M4 are both connected to the enable terminal to acquire mode control signals. For example,... Figure 2 As shown, the enable terminal is represented as [A]. The control terminal (g) of the third switch module M3 is connected to the enable terminal ([A]), and the control terminal (g) of the fourth switch module M4 is connected to the enable terminal ([A]).

[0036] Specifically, when the mode control signal is a charging signal, the third switch module M3 is turned on. At this time, the mode control signal is inverted by the second inverter A2, and the fourth switch module M4 is turned off. When the mode control signal is a discharging signal, the third switch module M3 is turned off. At this time, the mode control signal is inverted by the second inverter A2, and the fourth switch module M4 is turned on. Therefore, this embodiment, by configuring the second inverter A2 in the second selection circuit 13, enables the third switch module M3 and the fourth switch module M4 to be turned on separately, that is, only one switch module is turned on at any given time, while the other switch module is turned off, thereby controlling the current path during charging / discharging.

[0037] In this embodiment, the first voltage terminal of the third switch module M3 is connected to the second signal terminal of the control circuit 12, and the second voltage terminal of the third switch module M3 is connected to the battery module 14. This allows the third switch module M3 to conduct during charging, enabling current to flow from the control circuit 12 through the third switch module M3 into the battery module 14, thus charging the battery module 14. Similarly, the first voltage terminal of the fourth switch module M4 is connected to the second signal terminal of the control circuit 12, and the second voltage terminal of the fourth switch module M4 is connected to the battery module 14. This allows the fourth switch module M4 to conduct during discharging, enabling current to flow from the fourth switch module M4 through the control circuit 12 to supply power to an external load, thus discharging the battery module 14.

[0038] Therefore, this embodiment configures a third and a fourth switch module in the second selection circuit to control the on / off state after responding to the mode control signal input at the enable terminal. By changing the current path through different switch combinations, it can achieve voltage boosting or bucking to adapt to different charging and discharging needs, while simplifying the circuit structure.

[0039] In this regard, such as Figure 2 As shown, during charging, the first switch module M1 and the third switch module M3 turn on in response to the charging signal, while the second switch module M2 and the fourth switch module M4 turn off. Power is supplied by an external power source, and current flows into the first switch module M1 through the power supply terminal, then through the first signal modulation module Q1 and the third switch module M3 to enter the battery module 14, thus charging the battery module 14. During discharging, the second switch module M2 and the fourth switch module M4 turn on in response to the charging signal, while the first switch module M1 and the third switch module M3 turn off. Power is supplied by the battery module 14, and current flows into the fourth switch module M4, then through the second signal modulation module Q2 and the second switch module M2 to supply power to the external load, thus discharging the battery module 14.

[0040] In some embodiments, the first switch module, the second switch module, the third switch module, and the fourth switch module are all silicon controlled diodes.

[0041] In some embodiments, such as Figure 2 As shown, the second selection circuit 13 further includes: The first inductor L1 is connected between the first voltage terminal of the third switch module M3 and the second signal terminal of the control circuit 12; The second inductor L2 is connected between the first voltage terminal of the fourth switch module M4 and the second signal terminal of the control circuit 12. The first capacitor C1 is connected in parallel across the two ends of the battery module 14, and the second voltage terminal of the battery module 14 is connected to the output terminal of the second signal modulation module Q2.

[0042] In this embodiment, the first inductor L1 and the second inductor L2 serve as energy storage and filtering components in the circuit. Specifically, the first inductor L1 is positioned between the output terminal of the first signal modulation module Q1 and the first voltage terminal of the third switching module M3. That is, during charging, the current flows out of the first signal modulation module Q1 and then into the third switching module M3 via the first inductor L1. The second inductor L2 is positioned between the input terminal of the second signal modulation module Q2 and the first voltage terminal of the fourth switching module M4. That is, during discharging, the current flows out of the fourth switching module M4 and then into the second signal modulation module Q2 via the second inductor L2.

[0043] The first capacitor C1 is connected in parallel across the battery module 14, and it acts as a filter. During charging and discharging, the first capacitor C1 filters the voltage across the battery module 14, reducing voltage ripple and providing a stable voltage for the load and the battery.

[0044] Therefore, this embodiment achieves filtering by configuring a first inductor, a second inductor, and a first capacitor, that is, filtering out ripple in the output voltage and improving the stability, efficiency, and reliability of the circuit.

[0045] In some embodiments, the charging and discharging circuit further includes: The load module is connected between the first voltage terminal of the second switching module and the output terminal of the second signal modulation module.

[0046] In this embodiment, a load module is configured between the second switching module and the second signal modulation module to achieve a simulated load.

[0047] Based on the above embodiments, in some embodiments, such as Figure 2 As shown, the load module includes: Resistor R1 is connected between the first voltage terminal of the second switching module M2 and the output terminal of the second signal modulation module Q2; The second capacitor C2 is connected in parallel across the two ends of the resistor R1.

[0048] In this embodiment, resistor R1 and second capacitor C2 simulate the load to consume energy and simulate the working conditions of an actual load. During circuit debugging and testing, different load conditions are simulated by changing the value of the resistor, and the circuit's performance is observed. The second capacitor C2 performs a filtering function.

[0049] Therefore, this embodiment improves the stability of the circuit structure by simulating the load using a resistor and a second capacitor.

[0050] This application provides a bidirectional DC-DC converter, including a charging and discharging circuit as described in the above embodiments.

[0051] The bidirectional DC-DC converter provided in this application embodiment achieves flexible switching between charging and discharging by configuring the charging and discharging circuit as described in the above embodiment in the bidirectional DC-DC converter, while meeting the voltage and power requirements under charging and discharging, thereby simplifying the circuit structure and improving the flexibility of the circuit structure.

[0052] In the description of embodiments of this utility model, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] In the description of the embodiments of this utility model, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A charge-discharge circuit characterized by comprising: The charging and discharging circuit has a power supply terminal for connection to an external power source, an enable terminal for connection to the output terminal of a mode controller, and a signal input terminal for connection to the output terminal of a signal controller; the charging and discharging circuit includes: Battery module; A control circuit, the control terminal of which is connected to the signal input terminal, is used to control the operating parameters during the charging or discharging process according to the PWM signal input to the signal input terminal; A first selection circuit is connected between the power supply terminal and the first signal terminal of the control circuit, and its control terminal is connected to the enable terminal. The second selection circuit is connected between the battery module and the second signal terminal of the control circuit, and its control terminal is connected to the enable terminal. Both the first selection circuit and the second selection circuit are used to charge or discharge the battery module under the control of the mode control signal input at the enable terminal.

2. The charge and discharge circuit according to claim 1, characterized by, The control circuit includes: The first signal modulation module has its input terminal connected to the first signal terminal of the control circuit, its output terminal connected to the second signal terminal of the control circuit, and its control terminal connected to the signal input terminal. The second signal modulation module has its input terminal connected to the second signal terminal of the control circuit, its output terminal connected to the first signal terminal of the control circuit, and its control terminal connected to the signal input terminal.

3. The charge and discharge circuit according to claim 2, wherein The first selection circuit includes: First inverter; The first switching module has its control terminal connected to the enable terminal, its first voltage terminal connected to the high potential terminal of the power supply terminal, and its second voltage terminal connected to the input terminal of the first signal modulation module. The second switching module has its control terminal connected to the enable terminal via the first inverter, its first voltage terminal connected to the low potential terminal of the power supply terminal and the output terminal of the second signal modulation module, and its second voltage terminal connected to the input terminal of the first signal modulation module. The first selection circuit is configured to control the first switching module to turn on when the mode control signal is a charging signal, or to control the second switching module to turn on when the mode control signal is a discharging signal.

4. The charge and discharge circuit according to claim 3, wherein The second selection circuit includes: Second inverter; The third switch module has its control terminal connected to the enable terminal, its first voltage terminal connected to the second signal terminal of the control circuit, and its second voltage terminal connected to the first voltage terminal of the battery module. The fourth switch module has its control terminal connected to the enable terminal via the second inverter, its first voltage terminal connected to the second signal terminal of the control circuit, and its second voltage terminal connected to the first voltage terminal of the battery module. The second selection circuit is configured to control the third switch module to turn on when the charging signal is input at the enable terminal, or to control the fourth switch module to turn on when the discharging signal is input at the enable terminal.

5. The charge and discharge circuit according to claim 4, wherein The second selection circuit further includes: The first inductor is connected between the first voltage terminal of the third switching module and the second signal terminal of the control circuit. The second inductor is connected between the first voltage terminal of the fourth switching module and the second signal terminal of the control circuit. A first capacitor is connected in parallel across the two ends of the battery module, and the second voltage terminal of the battery module is connected to the output terminal of the second signal modulation module.

6. The charge and discharge circuit according to claim 5, wherein The charging and discharging circuit further includes: The load module is connected between the first voltage terminal of the second switching module and the output terminal of the second signal modulation module.

7. The charge and discharge circuit according to claim 6, wherein The load module includes: A resistor is connected between the first voltage terminal of the second switching module and the output terminal of the second signal modulation module; The second capacitor is connected in parallel across the two ends of the resistor.

8. The charge and discharge circuit according to claim 7, wherein The first switch module, the second switch module, the third switch module, and the fourth switch module are all silicon controlled diodes.

9. The charge and discharge circuit according to claim 8, wherein The first signal modulation module and the second signal modulation module are insulated gate bipolar transistors.

10. A bidirectional DC-DC converter, characterized by include: The charging and discharging circuit as described in any one of claims 1 to 9.

Images