Pre-charging circuit and energy storage power supply

Abstract

The utility model relates to a pre-charging circuit and an energy storage power supply, in the pre-charging circuit, a control module samples an input voltage of an input power supply and outputs a first control signal to a second switch module and a pre-charging protection module when the input voltage is within a preset range; the second switch module is switched on when receiving the first control signal to control the first switch module to be switched on, so that the input power supply supplies power to the load through the first switch module and the pre-charging resistor; when the pre-charging protection module receives the first control signal, the pre-charging protection module transmits the first control signal to the third switch module after delaying a preset time; and the third switch module is switched on when receiving the first control signal to control the power supply on-off module to be switched on, so that the input power supply supplies power to the load through the power supply on-off module, and meanwhile, the input power supply does not supply power to the load through the first switch module and the pre-charging resistor. According to the invention, the circuit can be prevented from being damaged due to overvoltage during pre-charging, and the safety of the circuit is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage power supplies, and in particular to a pre-charging circuit and an energy storage power supply. Background Art

[0002] With the development of photovoltaic energy storage, photovoltaic charging is widely used in a series of new energy products. More and more products support photovoltaic charging (PV). In response to the photovoltaic charging needs of different products, photovoltaic solar panels with different powers have also been spawned. Different photovoltaic solar panels have different nominal open circuit voltages. Conventional nominal open circuit voltages are: 25.2V, 58.3V, etc. Different nominal open circuit voltages can adapt to the charging needs of different products.

[0003] In the prior art, the terminals of different photovoltaic panels are generally universal, such as XT60 terminals, 7909 terminals, etc. Since the charging terminals are the same, users are likely to plug photovoltaic solar panels with high photovoltaic open circuit voltage levels into machines that only support low voltage levels, resulting in overvoltage and burning of the circuit board. Utility Model Content

[0004] The embodiments of the present application provide a protection circuit and an energy storage power supply, which can prevent the circuit from being damaged due to overvoltage during pre-charging, thereby improving the safety of the circuit.

[0005] In the first aspect, an embodiment of the present application provides a pre-charging circuit, including: a first switch module, a second switch module, a third switch module, a pre-charging resistor, a pre-charging protection module, a power supply on-off module, and a control module; the input power supply is connected to the pre-charging resistor through the first switch module, and the pre-charging resistor is respectively connected to the power supply on-off module and the load, the input power supply is also connected to the load through the power supply on-off module, the second switch module is connected to the control end of the first switch module, the third switch module is connected to the control end of the power supply on-off module, the control module is connected to the input power supply, the control module is connected to the control end of the second switch module, and the control module is also connected to the control end of the third switch module through the pre-charging protection module; the control module is used to sample the input power input voltage, and when the input voltage is within a preset range, outputs a first control signal to the second switch module and the pre-charge protection module; the second switch module is used to be turned on when receiving the first control signal to control the first switch module to be turned on, so that the input power supplies the load through the first switch module and the pre-charge resistor; the pre-charge protection module is used to transmit the first control signal to the third switch module after a preset time delay when receiving the first control signal; the third switch module is used to be turned on when receiving the first control signal to control the power supply on-off module to be turned on, so that the input power supplies the load through the power supply on-off module, and at the same time, the input power does not supply power to the load through the first switch module and the pre-charge resistor.

[0006] In some embodiments, the first switch module includes: a switch tube Q440 and a resistor R440; the first end of the switch tube Q440 is respectively connected to the first end of the resistor R440 and the input power supply, the second end of the switch tube Q440 is connected to the pre-charging resistor, and the control end of the switch tube Q440 is respectively connected to the second end of the resistor R440 and the second switch module.

[0007] In some embodiments, the second switch module includes: a switch tube Q441 and a resistor R441; the first end of the switch tube Q441 is connected to the first switch module through the resistor R441, the second end of the switch tube Q441 is grounded, and the control end of the switch tube Q441 is connected to the control module.

[0008] In some embodiments, the pre-charge protection module includes: a resistor R405, a resistor R408 and a capacitor C110; the first end of the resistor R405 is connected to the control module, the second end of the resistor R405 is connected to the first end of the capacitor C110, the first end of the resistor R408 and the control end of the third switch module, and the second end of the capacitor C110 and the second end of the resistor R408 are both grounded.

[0009] In some embodiments, the third switch module includes: a switch tube Q442; the first end of the switch tube Q442 is connected to the control end of the power supply on-off module, the second end of the switch tube Q442 is grounded, and the control end of the switch tube Q442 is connected to the pre-charging protection module.

[0010] In some embodiments, the switch tube Q442 is a MOS tube.

[0011] In some embodiments, the power supply on-off module includes: a relay RLY400; the first coil end of the relay RLY400 is used to connect to the first power supply, the second coil end of the relay RLY400 is connected to the third switch module, the first connection end of the relay RLY400 is connected to the input power supply, and the second connection end of the relay RLY400 is connected to the pre-charging resistor and the load.

[0012] In some embodiments, the pre-charging circuit further includes: a freewheeling diode; the positive electrode of the freewheeling diode is connected to the third switch module, and the negative electrode of the freewheeling diode is connected to the power supply on-off module.

[0013] In some embodiments, the pre-charging circuit further includes: a filter module; a first end of the filter module is connected to the input power supply, and a second end of the filter module is grounded.

[0014] In a second aspect, an embodiment of the present application provides an energy storage power supply, which includes the pre-charging circuit as described above.

[0015] The embodiment of the present application provides a pre-charging circuit and an energy storage power supply, wherein the pre-charging circuit includes a first switch module, a second switch module, a third switch module, a pre-charging resistor, a pre-charging protection module, a power supply on-off module, and a control module; the control module samples the input voltage of the input power supply, and when the input voltage is within a preset range, the control module outputs a first control signal to control the electric energy of the input power supply to be transmitted to the load, so as to prevent the input power supply from being over-voltage. Due to the setting of the pre-charging protection module, the third switch module is turned on after the first switch module is turned on, so that the load is first powered by the pre-charging resistor, and the load is pre-charged. Moreover, after the third switch module is turned on, the power supply on-off module is turned on, and the first switch module and the pre-charging resistor are bypassed to reduce the loss of electric energy in the pre-charging circuit. Therefore, the present application is implemented to prevent the circuit from being damaged due to overvoltage while pre-charging, thereby improving the safety of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0017] Figure 1 is a structural block diagram of a pre-charging circuit provided in one embodiment of the present application;

[0018] Figure 2 is a structural block diagram of a pre-charging circuit provided by another embodiment of the present application;

[0019] Figure 3 Schematic diagram of the circuit structure of a pre-charging circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0022] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0023] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0024] See also Figure 1 , Figure 1 1 is a structural block diagram of a pre-charging circuit 100 provided in one embodiment of the present application.

[0025] like Figure 1 As shown, the pre-charging circuit 100 includes: a first switch module 10 , a second switch module 40 , a third switch module 60 , a pre-charging resistor 20 , a pre-charging protection module 50 , a power supply on-off module 30 , and a control module 70 .

[0026] Specifically, the input power supply 200 is connected to the pre-charging resistor 20 through the first switch module 10, and the pre-charging resistor 20 is respectively connected to the power supply on-off module 30 and the load 300. The input power supply 200 is also connected to the load 300 through the power supply on-off module 30. The second switch module 40 is connected to the control end of the first switch module 10, and the third switch module 60 is connected to the control end of the power supply on-off module 30. The control module 70 is connected to the input power supply 200, and the control module 70 is connected to the control end of the second switch module 40. The control module 70 is also connected to the control end of the third switch module 60 through the pre-charging protection module 50.

[0027] The control module 70 is used to sample the input voltage of the input power supply 200, and when the input voltage is within a preset range, output a first control signal to the second switch module 40 and the pre-charge protection module 50. The second switch module 40 is used to turn on when receiving the first control signal to control the first switch module 10 to turn on, so that the input power supply 200 supplies power to the load 300 through the first switch module 10 and the pre-charge resistor 20. The pre-charge protection module 50 is used to transmit the first control signal to the third switch module 60 after a preset time delay when receiving the first control signal. The third switch module 60 is used to turn on when receiving the first control signal to control the power supply on-off module 30 to turn on, so that the input power supply 200 supplies power to the load 300 through the power supply on-off module 30, and at the same time, the input power supply 200 does not supply power to the load 300 through the first switch module 10 and the pre-charge resistor 20. The load 300 may be a capacitive load.

[0028] When the input voltage is not within the preset range, the control module 70 outputs a second control signal to the second switch module 40 and the pre-charge protection module 50. The second switch module 40 is used to shut down when receiving the second control signal to control the first switch module 10 to shut down. The pre-charge protection module 50 is used to transmit the second control signal to the third switch module 60 after a preset delay time when receiving the second control signal. The third switch module 60 is used to shut down when receiving the second control signal to control the power supply on-off module 30 to disconnect, so that the input power supply 200 does not supply power to the load 300 through the power supply on-off module 30. Due to the setting of the pre-charge protection module 50, the power supply on-off module 30 is disconnected only after the second switch module 40 is disconnected.

[0029] It should be noted that the preset range can be set according to actual needs and is not specifically limited here. The first control signal is used to control the conduction state of the second switch module 40, and control the pre-charge protection module 50 to transmit the first control signal to the third switch module 60 after a preset delay time. The second control signal is used to control the second switch module 40 to disconnect, and control the pre-charge protection module 50 to transmit the second control signal to the third switch module 60 after a preset delay time. In some embodiments, the first control signal is a high-level signal and the second control signal is a low-level signal. The preset time is determined by the components of the circuit and the connection relationship between the components, and is not specifically limited here.

[0030] In this embodiment, the control module 70 samples the input voltage of the input power supply 200. When the input voltage is within a preset range, the control module 70 outputs a first control signal to control the power supply 200 to transmit the electric energy to the load 300, thereby preventing the input power supply from being over-voltage. Due to the setting of the pre-charging protection module 50, the third switch module 60 is turned on after the first switch module 10 is turned on, so that the load 300 is first powered by the pre-charging resistor 20, thereby pre-charging the load 300. In addition, after the third switch module 60 is turned on, the power supply on-off module 30 is turned on, and the first switch module 10 and the pre-charging resistor 20 are bypassed to reduce the loss of electric energy by the pre-charging circuit 20. Thus, the pre-charging circuit of the present application can prevent the input power supply from being over-voltage while pre-charging, thereby improving the safety of the circuit.

[0031] See also Figure 2 , Figure 2 1 is a structural block diagram of a pre-charging circuit 100 provided in another embodiment of the present application.

[0032] In some embodiments, Figure 2 As shown, the pre-charging circuit 100 further includes a flyback diode 80 . Specifically, the anode of the flyback diode 80 is connected to the third switch module 60 , and the cathode of the flyback diode 80 is connected to the power supply on-off module 30 .

[0033] like Figure 2 As shown, the pre-charging circuit 100 further includes: a filter module 90. Specifically, a first end of the filter module 90 is connected to the input power source 200, and a second end of the filter module 90 is grounded.

[0034] In some embodiments, the control module 70 includes a sampling unit (not shown) and a control unit (not shown). Specifically, the sampling unit is connected to the input power supply 200 and the control unit, and the control unit is connected to the first switch module 40 and the pre-charge protection module 50. The sampling unit collects the input voltage of the input power supply 200, and the control unit outputs a first control signal to the second switch module 40 and the pre-charge protection module 50 when the input voltage is within a preset range. Among them, the control unit may be an MCU (Micro Control Unit) or other control device. The sampling unit may be a voltage sampling device, which is set according to actual needs and is not specifically limited here.

[0035] See also Figure 3 , Figure 3 1 is a schematic diagram of the circuit structure of a pre-charging circuit 100 provided in one embodiment of the present application.

[0036] In some embodiments, Figure 3 As shown, the first switch module 10 includes: a switch tube Q440 and a resistor R440. Specifically, the first end of the switch tube Q440 is connected to the first end of the resistor R440 and the input power supply 200, respectively, the second end of the switch tube Q440 is connected to the pre-charging resistor 20, and the control end of the switch tube Q440 is connected to the second end of the resistor R440 and the second switch module 40, respectively. The switch tube Q440 can be a PNP transistor, the base of the PNP transistor is the control end of the switch tube Q440, the emitter of the PNP transistor is the first end of the switch tube Q440, and the collector of the PNP transistor is the second end of the switch tube Q440.

[0037] The second switch module 40 includes: a switch tube Q441 and a resistor R441. Specifically, the first end of the switch tube Q441 is connected to the first switch module 10 through the resistor R441, the second end of the switch tube Q441 is grounded, and the control end of the switch tube Q441 is connected to the control module 70. The switch tube Q441 is an NPN transistor, the base of the NPN transistor is the control end of the switch tube Q441, the collector of the NPN transistor is the first end of the switch tube Q441, and the emitter of the NPN transistor is the second end of the switch tube Q441.

[0038] The pre-charge protection module 50 includes: a resistor R405, a resistor R408 and a capacitor C110. Specifically, the first end of the resistor R405 is connected to the control module 70, the second end of the resistor R405 is connected to the first end of the capacitor C110, the first end of the resistor R408 and the control end of the third switch module 60, and the second end of the capacitor C110 and the second end of the resistor R408 are grounded.

[0039] The third switch module 60 includes: a switch tube Q442. Specifically, the first end of the switch tube Q442 is connected to the control end of the power supply on-off module 30, the second end of the switch tube Q442 is grounded, and the control end of the switch tube Q442 is connected to the pre-charge protection module 50. The switch tube Q442 is a MOS tube. In some embodiments, the switch tube Q442 is an NMOS tube, the gate of the NMOS tube is the control end of the switch tube Q442, the drain of the NMOS tube is the first end of the switch tube Q442, and the source of the NMOS tube is the second end of the switch tube Q442.

[0040] The power supply on-off module 30 includes: a relay RLY400. Specifically, the first coil end of the relay RLY400 is used to connect to the first power source, the second coil end of the relay RLY400 is connected to the third switch module 60, the first connection end of the relay RLY400 is connected to the input power source 200, and the second connection end of the relay RLY400 is connected to the pre-charging resistor 20 and the load 300. In some embodiments, the relay RLY400 includes a normally open contact and a coil. When there is no current in the coil or the current is too small, the normally open contact is disconnected, and when the current in the coil is sufficient, the normally open contact is closed.

[0041] The load includes a capacitor EC400 and a subsequent circuit. The positive electrode of the capacitor EC400 is connected to the pre-charging resistor RT400, the relay RLY400 and the subsequent circuit, and the negative electrode of the capacitor EC400 is grounded.

[0042] In this embodiment, if Figure 3As shown, when the input power PV supplies power to the pre-charging circuit, the control module (not shown) collects the input voltage, and when the input voltage is within the preset range, the output terminal PV_EN of the control module 70 inputs a first control signal to the switch tube Q441 and the resistor R405. Then, the switch tube Q441 is turned on when receiving the first control signal at the PV_EN terminal, and then the switch tube Q440 is turned on, and the input power PV supplies power to the capacitor EC400 through the switch tube Q440 and the pre-charging resistor RT400 for pre-charging. Since the capacitor C110, the resistor R405 and the resistor R408 form a delay circuit, the switch tube Q442 is turned on when the first control signal is input for a preset time. When the switch tube Q442 is turned on, the coil of the relay RLY400 is energized, so that the normally open contact of the relay RLY400 is closed. At this time, the input power supply PV supplies power to the load through the relay PLY400. At the same time, the relay RLY400 bypasses the switch tube Q440 and the resistor RT400. The input power supply PV does not supply power to the load through the switch tube Q440 and the resistor RT400, so as to reduce the loss of electric energy by the resistor RT400.

[0043] In this embodiment, the control module 70 samples the input voltage of the input power supply 200. When the input voltage is within a preset range, the control module 70 outputs a first control signal to control the power supply 200 to transmit the electric energy to the load 300, thereby preventing the input power supply from being over-voltage. Due to the setting of the pre-charging protection module 50, the third switch module 60 is turned on after the first switch module 10 is turned on, so that the load 300 is first powered by the pre-charging resistor 20, thereby pre-charging the load 300. In addition, after the third switch module 60 is turned on, the power supply on-off module 30 is turned on, and the first switch module 10 and the pre-charging resistor 20 are bypassed to reduce the loss of electric energy by the pre-charging circuit 20. Thus, the pre-charging circuit of the present application can prevent the input power supply from being over-voltage while pre-charging, thereby improving the safety of the circuit.

[0044] An embodiment of the present application provides an energy storage power supply, which includes the pre-charging circuit 100 as described above.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the idea of ​​the present application, the technical features in the above embodiments or different embodiments may also be combined, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pre-charging circuit, It is characterized in that include: A first switch module, a second switch module, a third switch module, a pre-charging resistor, a pre-charging protection module, a power supply on-off module, and a control module; The input power supply is connected to the pre-charging resistor through the first switch module, the pre-charging resistor is respectively connected to the power supply on-off module and the load, the input power supply is also connected to the load through the power supply on-off module, the second switch module is connected to the control end of the first switch module, the third switch module is connected to the control end of the power supply on-off module, the control module is connected to the input power supply, the control module is connected to the control end of the second switch module, and the control module is also connected to the control end of the third switch module through the pre-charging protection module; The control module is used to sample the input voltage of the input power supply, and when the input voltage is within a preset range, output a first control signal to the second switch module and the pre-charge protection module; The second switch module is used to be turned on when receiving the first control signal to control the first switch module to be turned on, so that the input power supplies power to the load through the first switch module and the pre-charging resistor; The pre-charge protection module is used for transmitting the first control signal to the third switch module after a preset delay time upon receiving the first control signal; The third switch module is used to be turned on when receiving the first control signal to control the power supply on-off module to be turned on, so that the input power supplies power to the load through the power supply on-off module, and at the same time, the input power supplies power to the load not through the first switch module and the pre-charging resistor.

2. precharge circuit according to claim 1, It is characterized in that The first switch module includes: a switch tube Q440 and a resistor R440; The first end of the switch tube Q440 is respectively connected to the first end of the resistor R440 and the input power supply, the second end of the switch tube Q440 is connected to the pre-charging resistor, and the control end of the switch tube Q440 is respectively connected to the second end of the resistor R440 and the second switch module.

3. precharge circuit according to claim 1, It is characterized in that The second switch module includes: a switch tube Q441 and a resistor R441; The first end of the switch tube Q441 is connected to the first switch module through the resistor R441, the second end of the switch tube Q441 is grounded, and the control end of the switch tube Q441 is connected to the control module.

4. precharge circuit according to claim 1, It is characterized in that The pre-charge protection module includes: a resistor R405, a resistor R408 and a capacitor C110; The first end of the resistor R405 is connected to the control module, the second end of the resistor R405 is connected to the first end of the capacitor C110, the first end of the resistor R408 and the control end of the third switch module, and the second end of the capacitor C110 and the second end of the resistor R408 are grounded.

5. precharge circuit according to claim 1, It is characterized in that The third switch module includes: a switch tube Q442; The first end of the switch tube Q442 is connected to the control end of the power supply on-off module, the second end of the switch tube Q442 is grounded, and the control end of the switch tube Q442 is connected to the pre-charge protection module.

6. precharge circuit according to claim 5, It is characterized in that The switch tube Q442 is a MOS tube.

7. precharge circuit according to claim 1, It is characterized in that The power supply on-off module includes: a relay RLY400; The first coil end of the relay RLY400 is used to connect to the first power supply, the second coil end of the relay RLY400 is connected to the third switch module, the first connection end of the relay RLY400 is connected to the input power supply, and the second connection end of the relay RLY400 is connected to the pre-charging resistor and the load.

8. A precharge circuit according to any one of claims 1 to 7, It is characterized in that The pre-charging circuit further includes: a freewheeling diode; The positive electrode of the freewheeling diode is connected to the third switch module, and the negative electrode of the freewheeling diode is connected to the power supply on-off module.

9. The precharge circuit according to claim 8, It is characterized in that The pre-charging circuit further includes: a filtering module; A first end of the filter module is connected to the input power supply, and a second end of the filter module is grounded.

10. An energy storage power source, It is characterized in that The energy storage power supply comprises a pre-charging circuit as described in any one of claims 1-9.

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