Charging control circuit, charging control device and energy storage equipment

Abstract

The utility model belongs to the technical field of energy storage, and provides a charging control circuit, a charging control device and energy storage equipment, a charging switch module is connected between a power supply input end and an energy storage module, and the charging switch module controls the energy storage process of the energy storage module according to on or off of a charging control signal. The freewheeling switch module is switched on or switched off according to the freewheeling pulse signal to control the energy storage module to charge the energy storage battery, and the main control module detects electrical parameters of the power input end and the energy storage battery and adjusts the charging control signal and the freewheeling pulse signal according to a detection result. The voltage difference between the power input end and the energy storage battery is controlled to be kept within the preset voltage threshold range, so that the voltage of the power input end is larger than that of the energy storage battery, the charging process is adjusted in real time by adjusting the charging control signal and the follow current pulse signal, and the charging efficiency and the charging power of the energy storage battery are improved.

Description

Technical Field

[0001] This application belongs to the technical field of energy storage, and particularly relates to a charging control circuit, a charging control device, and an energy storage device. Background Art

[0002] Outdoor mobile power supplies are becoming more and more popular among the public. Outdoor mobile power supplies have a wide range of application fields. Outdoor mobile power supplies can provide temporary power supply for emergency treatment. Outdoor mobile power supplies are very useful in scenarios such as outdoor camping, self-driving tourism, outdoor fishing, vehicle-mounted emergency, medical devices, and rescue construction, and can supply power to various electronic devices and tools. During the use of existing energy storage power supplies, the charging, power supply, and solar power generation of the energy storage power supply are relatively independent. When using a solar cell to charge a battery, when the voltage of the battery deviates greatly from the set value, the charging power or efficiency of the battery is relatively low, resulting in a long charging time. Summary of the Utility Model

[0003] In order to solve the above technical problems, the embodiments of this application provide a charging control circuit, a charging control device, and an energy storage device, which can solve the problem of relatively low charging power or efficiency of the battery in the existing energy storage power supply system.

[0004] The first aspect of the embodiments of this application provides a charging control circuit, which is connected to an energy storage battery. The charging control circuit includes:

[0005] A power input terminal for connecting to an external power supply;

[0006] An energy storage module connected to the energy storage battery;

[0007] A charging switch module connected between the power input terminal and the energy storage module, for conducting or turning off according to a charging control signal to control the energy storage process of the energy storage module;

[0008] A freewheeling switch module connected to the energy storage module, for conducting or turning off according to a freewheeling pulse signal to control the process of the energy storage module charging the energy storage battery;

[0009] A main control module for detecting the electrical parameters of the power input terminal and the energy storage battery, and adjusting the charging control signal and the freewheeling pulse signal according to the detection results to control the voltage difference between the power input terminal and the energy storage battery to be maintained within a preset voltage threshold range, and the main control module controls the charging switch module and the freewheeling switch module to conduct alternately.

[0010] In some embodiments, the charging switch module includes:

[0011] A push-pull drive unit, configured to receive a charging control signal and generate a corresponding push-pull drive signal according to the charging control signal;

[0012] A first switch unit, connected to the push-pull drive unit, configured to conduct or cut off according to the push-pull drive signal to control the connection state between the power input terminal and the energy storage module.

[0013] In some embodiments, the freewheeling switch module includes:

[0014] A freewheeling drive unit, configured to receive a freewheeling pulse signal and generate a corresponding freewheeling drive signal according to the freewheeling pulse signal;

[0015] A second switch unit, connected to the freewheeling drive unit, configured to conduct or cut off according to the freewheeling drive signal to control the charging process of the energy storage module to the energy storage battery.

[0016] In some embodiments, the main control module includes:

[0017] An input voltage sampling unit, connected to the power input terminal, configured to sample the voltage of the power input terminal to obtain an input terminal voltage sampling signal;

[0018] A battery voltage detection unit, configured to sample the voltage of the energy storage battery to obtain a battery voltage sampling signal;

[0019] A battery current detection unit, configured to sample the current flowing through the energy storage battery to obtain a battery current sampling signal;

[0020] A control unit, respectively connected to the input voltage sampling unit, the battery voltage detection unit, and the battery current detection unit, configured to adjust the charging control signal and the freewheeling pulse signal according to the input terminal voltage sampling signal, the battery voltage sampling signal, and the battery current sampling signal.

[0021] In some embodiments, the push-pull drive unit is a push-pull drive circuit, and the push-pull drive circuit amplifies the charging control signal to obtain the corresponding push-pull drive signal.

[0022] In some embodiments, the freewheeling drive unit is a triode drive circuit, and the triode drive circuit is configured to amplify the freewheeling pulse signal to obtain the corresponding freewheeling drive signal.

[0023] In some embodiments, the energy storage module includes at least one inductor and at least one capacitor, the inductor and the capacitor are connected in parallel, and the charging switch module is connected to the energy storage battery through at least one of the inductors.

[0024] In some embodiments, the battery current detection unit includes:

[0025] A current sampling sub-unit, connected to the energy storage battery, for converting the current flowing through the energy storage battery into a corresponding sampled voltage signal;

[0026] A sampling and amplifying sub-unit, connected to the current sampling sub-unit, for amplifying the sampled voltage signal to obtain a sampled and amplified signal;

[0027] A signal processing sub-unit, connected to the sampling and amplifying sub-unit and the control unit, for filtering the sampled and amplified signal to obtain a battery current sampling signal and outputting it to the control unit.

[0028] The second aspect of the embodiments of the present application further provides a charging control device, and the charging control device includes the charging control circuit as described in any one of the above embodiments.

[0029] The third aspect of the embodiments of the present application further provides an energy storage device, and the energy storage device includes: a photovoltaic array, an energy storage battery, and the charging control circuit as described in any one of the above embodiments; the power input end is connected to the photovoltaic array.

[0030] The beneficial effects of the embodiments of the present application: The charging switch module is connected between the power input end and the energy storage module, and the charging switch module is turned on or off according to the charging control signal to control the energy storage process of the energy storage module. The freewheeling switch module is turned on or off according to the freewheeling pulse signal to control the energy storage module to charge the energy storage battery. The main control module detects the electrical parameters of the power input end and the energy storage battery, and adjusts the charging control signal and the freewheeling pulse signal according to the detection results to control the voltage difference between the power input end and the energy storage battery to be maintained within a preset voltage threshold range, so that the voltage of the power input end is greater than the voltage of the energy storage battery. By adjusting the charging control signal and the freewheeling pulse signal, the charging process is adjusted in real time, and the charging efficiency and charging power of the energy storage battery are improved. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of a charging control circuit provided by an embodiment of the present application;

[0032] Figure 2 is a schematic structural diagram of a charging control circuit provided by another embodiment of the present application;

[0033] Figure 3 is a schematic structural diagram of a charging control circuit provided by another embodiment of the present application;

[0034] Figure 4 is a schematic structural diagram of a charging control circuit provided by another embodiment of the present application;

[0035] Figure 5 It is a schematic structural diagram of a battery current detection unit provided by an embodiment of the present application;

[0036] Figure 6 It is a schematic structural diagram of a battery voltage detection unit provided by an embodiment of the present application;

[0037] 400: Energy storage module; 200: Charging switch module; 300: Freewheeling switch module; 500: Main control module; 110: Energy storage battery; 120: Power input terminal; 210: Push-pull drive unit; 220: First switch unit; 310: Freewheeling drive unit; 320: Second switch unit; 510: Input voltage sampling unit; 520: Battery voltage detection unit; 530: Battery current detection unit; 540: Control unit; 531: Current sampling sub-unit; 532: Sampling and amplification sub-unit; 533: Signal processing sub-unit. Detailed implementation manners

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and 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.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means one or more than one, unless otherwise specifically defined.

[0042] During the use of existing energy storage power supplies, the charging, power supply, and solar power generation of the energy storage power supply are relatively independent. When using a solar cell to charge the battery, if the voltage of the battery deviates greatly from the set value, the charging power or efficiency of the battery is relatively low, resulting in a longer charging time.

[0043] To solve the above technical problems, an embodiment of the present application provides a charging control circuit. Refer to Figure 1 As shown, the charging control circuit in the embodiment of the present application is connected to the energy storage battery 110. The charging control circuit includes: a power input terminal 120, an energy storage module 400, a charging switch module 200, a freewheeling switch module 300, and a main control module 500. Specifically, the power input terminal 120 is connected to an external power source, and the energy storage module 400 is connected to the energy storage battery 110; the charging switch module 200 is connected between the power input terminal 120 and the energy storage module 400, and the charging switch module 200 is turned on or off according to a charging control signal to control the energy storage process of the energy storage module 400. The freewheeling switch module 300 is connected to the energy storage module 400, and the freewheeling switch module 300 is turned on or off according to a freewheeling pulse signal to control the process of the energy storage module 400 charging the energy storage battery 110. The main control module 500 is used to control the charging switch module 200 and the freewheeling switch module 300 to conduct alternately, and detect the electrical parameters of the power input terminal 120 and the energy storage battery 110, and adjust the charging control signal and the freewheeling pulse signal according to the detection results to control the voltage difference between the power input terminal 120 and the energy storage battery 110 to be maintained within a preset voltage threshold range.

[0044] In this embodiment, the voltage of the power input terminal 120 is greater than the voltage of the energy storage battery 110, and the charging switch module 200 and the freewheeling switch module 300 conduct alternately. The charging switch module 200 is turned on or off according to a charging control signal to control the energy storage process of the energy storage module 400. The freewheeling switch module 300 is turned on or off according to a freewheeling pulse signal to control the energy storage module 400 to charge the energy storage battery 110. The main control module 500 detects the electrical parameters of the power input terminal 120 and the energy storage battery 110, and adjusts the charging control signal and the freewheeling pulse signal according to the detection results to control the voltage difference between the power input terminal 120 and the energy storage battery 110 to be maintained within a preset voltage threshold range, so that the voltage of the power input terminal 120 is always higher than the voltage of the positive terminal of the energy storage battery 110, and the voltage of the power input terminal 120 is always higher than the voltage of the positive terminal of the energy storage battery 110, and the voltage difference between the power input terminal 120 and the positive terminal of the energy storage battery 110 is maintained within a preset voltage threshold range, achieving the purpose of improving the charging efficiency and charging power of the energy storage battery 110.

[0045] In some embodiments, refer to Figure 2As shown, the charging switch module 200 includes a push-pull driving unit 210 and a first switch unit 220. The push-pull driving unit 210 is configured to receive a charging control signal and generate a corresponding push-pull driving signal according to the charging control signal. The first switch unit 220 is connected to the push-pull driving unit 210, and the first switch unit 220 is connected between the power input terminal 120 and the energy storage module 400. The first switch unit 220 is turned on or off according to the push-pull driving signal to control the connection state between the power input terminal 120 and the energy storage module 400.

[0046] In this embodiment, the push-pull driving unit 210 generates a push-pull driving signal for driving the first switch unit 220 according to the charging control signal. The first switch unit 220 is controlled by the push-pull driving signal. When the first switch unit 220 is turned on, the current of the power input terminal 120 is output to the energy storage module 400 through the first switch unit 220, and is stored in the inductor of the energy storage module 400 in the form of electric energy.

[0047] In some embodiments, as shown in Figure 2 As shown, the freewheeling switch module 300 includes a freewheeling driving unit 310 and a second switch unit 320. The freewheeling driving unit 310 is configured to receive a freewheeling pulse signal and generate a corresponding freewheeling driving signal according to the freewheeling pulse signal. The second switch unit 320 is connected to the freewheeling driving unit 310. The second switch unit 320 is configured to be turned on or off according to the freewheeling driving signal, and can control the charging process of the energy storage module 400 to the energy storage battery 110.

[0048] In this embodiment, the freewheeling driving unit 310 generates a freewheeling driving signal for driving the second switch unit 320 according to the freewheeling pulse signal. The second switch unit 320 is controlled by the freewheeling driving signal. When the second switch unit 320 is turned on and the first switch unit 220 is turned off, the electric energy stored in the inductor of the energy storage module 400 is released, thereby charging the energy storage battery 110.

[0049] In some embodiments, the charging switch module 200 and the freewheeling switch module 300 are alternately turned on. At this time, the first switch unit 220 and the second switch unit 320 are not turned on simultaneously. The charging control signal and the freewheeling pulse signal always maintain the form of "one is turned on by a high level and the other is not turned on by a low level". The first switch unit 220 and the second switch unit 320 are alternately turned on and off, so that the inductor in the energy storage module 400 can continuously charge and release electric energy, achieving the purpose of charging the energy storage battery 110.

[0050] In some embodiments, the sum of the duty cycles of the charging control signal and the freewheeling pulse signal is equal to 1. For example, if the duty cycle of the charging control signal is 30%, then the duty cycle of the freewheeling pulse signal is 70%. The specific duty cycles of the charging control signal and the freewheeling pulse signal can be determined according to the voltage of the power input terminal 120 and the voltage across the energy storage battery 110, so that the voltage input to the energy storage battery 110 is always higher than the voltage of the energy storage battery 110, and the voltage of the power input terminal 120 is always higher than the positive terminal voltage of the energy storage battery 110, and the voltage difference between the power input terminal 120 and the positive terminal of the energy storage battery 110 is maintained within a preset voltage threshold range, achieving the purpose of improving the charging efficiency and charging power of the energy storage battery 110.

[0051] In some embodiments, the sum of the duty cycles of the charging control signal and the freewheeling pulse signal can be less than 1. After the high-level charging control signal ends, the charging control signal is set to low level, and the freewheeling pulse signal is set to high level. And when the high-level signal of the freewheeling pulse signal ends, the charging control signal and the freewheeling pulse signal can be simultaneously set to low-level signals. The duty cycle of the charging control signal and the freewheeling pulse signal being simultaneously set to low-level signals can be determined according to the detection result of the main control module 500. For example, if the duty cycle of the charging control signal is 30%, then the duty cycle of the freewheeling pulse signal is 40%. When the charging control signal is high level and the high level ends, the freewheeling pulse signal can be set to high level, and when the high-level signal of the freewheeling pulse signal ends, the charging control signal and the freewheeling pulse signal can be simultaneously set to low-level signals, and the duty cycle of this low-level signal is 30%.

[0052] In some embodiments, the sum of the duty cycles of the charging control signal and the freewheeling pulse signal can be less than 1. After the high-level charging control signal ends, the charging control signal and the freewheeling pulse signal can be simultaneously set to low-level signals. The duty cycle of the charging control signal and the freewheeling pulse signal being simultaneously set to low-level signals can be determined according to the detection result of the main control module 500. After this part of the low-level signal ends, the charging control signal remains low level, and the freewheeling pulse signal is set to high level. For example, if the duty cycle of the charging control signal is 30%, then the duty cycle of the freewheeling pulse signal is 40%. When the charging control signal is high level and the high level ends, the charging control signal and the freewheeling pulse signal are simultaneously set to low-level signals. After this part of the low-level signal ends, the charging control signal remains low level, and the freewheeling pulse signal is set to high level, and the duty cycle of this low-level signal is 30%.

[0053] In some embodiments, refer to Figure 3As shown in the figure, the main control module 500 includes an input voltage sampling unit 510, a battery voltage detection unit 520, a battery current detection unit 530, and a control unit 540. The input voltage sampling unit 510 is connected to the power input terminal 120 and is used to sample the voltage of the power input terminal 120 to obtain an input terminal voltage sampling signal; the battery voltage detection unit 520 is used to sample the voltage of the energy storage battery 110 to obtain a battery voltage sampling signal; the battery current detection unit 530 is used to sample the current flowing through the energy storage battery 110 to obtain a battery current sampling signal. The control unit 540 is respectively connected to the input voltage sampling unit 510, the battery voltage detection unit 520, and the battery current detection unit 530, and the control unit 540 is used to adjust the charging control signal and the freewheeling pulse signal according to the input terminal voltage sampling signal, the battery voltage sampling signal, and the battery current sampling signal.

[0054] In this embodiment, the battery current detection unit 530 is used to detect the current value of the energy storage battery 110, and transmit the obtained battery current sampling signal to the control unit 540, and then adjust the duty cycle of the charging control signal and the freewheeling pulse signal through the control unit 540 to make the charging current stable. In order to ensure that the charging power of the energy storage battery 110 is within the high-efficiency charging range, when the electric energy input by the photovoltaic array is determined, the input charging power P can be regarded as stable, P = UI. By detecting the current value of the energy storage battery 110 and adjusting the charging current by adjusting the duty cycle of the charging control signal and the freewheeling pulse signal, the voltage U1 of the photovoltaic array is always 0.1V - 0.2V higher than the voltage U2 of the energy storage battery 110.

[0055] In some embodiments, the power input terminal 120 can be connected to a photovoltaic array. For example, the photovoltaic array is connected to the power input terminal 120 via a connection terminal. When the first switch unit 220 is turned on, the photovoltaic array inputs electric energy to the energy storage module 400 via the first switch unit 220.

[0056] In this embodiment, the input voltage sampling unit 510 can be used to detect the voltage of the photovoltaic array, and generate an input terminal sampling signal based on the voltage of the photovoltaic array and output it to the control unit 540. The battery voltage detection unit 520 is used to detect the voltage of the energy storage battery 110, and the battery current detection unit 530 is used to detect the current flowing through the energy storage battery 110. In order to ensure that the energy storage battery 110 is charged under a relatively efficient working condition, the control unit 540 makes the detected voltage of the photovoltaic array always higher than the voltage of the energy storage battery 110 by a threshold voltage by adjusting the duty cycle of the charging control signal and the freewheeling pulse signal, and the threshold voltage is within a preset voltage threshold range.

[0057] In some embodiments, the preset voltage threshold range can be 0.1V - 0.2V, that is, the lower voltage limit of the preset voltage threshold range is 0.1V, and the upper voltage limit of the preset voltage threshold range is 0.2V.

[0058] In some embodiments, the push - pull driving unit 210 can be a push - pull driving circuit. The push - pull driving circuit amplifies the charging control signal to obtain a corresponding push - pull driving signal. The push - pull driving signal obtained by amplifying the charging control signal has a strong driving ability and can drive high - power switching devices such as Metal - Oxide - Semiconductor Field - Effect Transistor (MOSFET) and Insulate - Gate Bipolar Transistor (IGBT).

[0059] In some embodiments, referring to Figure 4 As shown, the push - pull driving unit 210 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a first diode D1, and a first capacitor C1; The first end of the third resistor R3 is connected to the main control module 500, the second end of the third resistor R3, the first end of the fourth resistor R4, and the control end of the second switching tube Q2 are commonly connected, the second end of the fourth resistor R4 is grounded, the first end of the first resistor R1 is connected to the first power supply terminal, the second end of the first resistor R1 is connected to the anode of the first diode D1, the cathode of the first diode D1, the first end of the second resistor R2, the first end of the first switching tube Q1, the first end of the third switching tube Q3, and the first end of the first capacitor C1 are commonly connected, the second end of the second resistor R2, the control end of the first switching tube Q1, and the first end of the second switching tube Q2 are commonly connected, and the second end of the second switching tube Q2 is grounded through the fifth resistor R5; The second end of the first switching tube Q1 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6, the first end of the seventh resistor R7, the control end of the third switching tube Q3, and the control end of the fourth switching tube Q4 are commonly connected, the second end of the third switching tube Q3, the first end of the fourth switching tube Q4, and the first end of the eighth resistor R8 are commonly connected, the second end of the seventh resistor R7, the first end of the ninth resistor R9, and the second end of the fourth switching tube Q4 are commonly connected to the second end of the first capacitor C1, and the second end of the ninth resistor R9 is grounded; The second end of the eighth resistor R8 is connected to the first switching unit 220.

[0060] In this embodiment, the first end of the third resistor R3 receives the charging control signal MCU_CHARGER. When the first end of the third resistor R3 receives a high-level charging control signal MCU_CHARGER, the second switching transistor Q2, the first switching transistor Q1, and the third switching transistor Q3 are turned on in sequence. At this time, the first switching unit 220 connected to the third switching transistor Q3 is turned on. After the first switching unit 220 is turned on, the current at the power input terminal 120 inputs electrical energy to the energy storage module 400 via the first switching unit 220. When the first end of the third resistor R3 receives a low-level charging control signal MCU_CHARGER, the first switching unit 220 is turned off.

[0061] In some embodiments, the first switching unit 220 includes a sixteenth resistor R16 and a seventh switching transistor Q7. The first end of the sixteenth resistor R16 and the control end of the seventh switching transistor Q7 are commonly connected to the push-pull driving unit 210. The first end of the seventh switching transistor Q7 is connected to the power input terminal 120. The second end of the seventh switching transistor Q7 and the second end of the sixteenth resistor R16 are commonly connected to the energy storage module 400.

[0062] In some embodiments, the second switching transistor Q2 can be an NPN triode.

[0063] In some embodiments, the first switching transistor Q1 can be a PNP triode.

[0064] In some embodiments, the third switching transistor Q3 can be an NPN triode, and the fourth switching transistor Q4 can be a PNP triode.

[0065] In some embodiments, the seventh switching transistor Q7 can be an N-type MOS transistor or an IGBT transistor.

[0066] In some embodiments, the freewheeling driving unit 310 is a triode driving circuit, and the triode driving circuit is used to amplify the freewheeling pulse signal to obtain a corresponding freewheeling driving signal. The freewheeling driving signal obtained by amplifying the freewheeling pulse signal has a strong driving ability and can drive high-power switching devices such as Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and Insulate-Gate Bipolar Transistor (IGBT).

[0067] In some embodiments, refer to Figure 4As shown in the figure, the freewheeling drive unit 310 includes: the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the fifth switching transistor Q5, and the sixth switching transistor Q6; the first end of the twelfth resistor R12 is connected to the main control module 500, the second end of the twelfth resistor R12, the first end of the thirteenth resistor R13, and the control end of the sixth switching transistor Q6 are commonly connected, the first end of the sixth switching transistor Q6 is connected to the first end of the eleventh resistor R11, the second end of the eleventh resistor R11 and the first end of the tenth resistor R10 are commonly connected to the control end of the fifth switching transistor Q5, the first end of the fifth switching transistor Q5 and the first end of the tenth resistor R10 are commonly connected to the first power supply terminal, the second end of the thirteenth resistor R13 and the second end of the sixth switching transistor Q6 are grounded, the second end of the fifth switching transistor Q5, the first end of the fifteenth resistor R15, and the first end of the fourteenth resistor R14 are commonly connected, the second end of the fourteenth resistor R14 is grounded, and the second end of the fifteenth resistor R15 is connected to the second switching unit 320.

[0068] In this embodiment, the first end of the twelfth resistor R12 is used to receive the freewheeling pulse signal MCU_FLOW. When the first end of the third resistor R3 receives a low-level charging control signal MCU_CHARGER, the first switching unit 220 is disconnected. At this time, the freewheeling pulse signal MCU_FLOW can be at a high level, the sixth switching transistor Q6 and the fifth switching transistor Q5 are turned on in sequence, the second switching unit 320 is turned on, and the electric energy stored in the inductor in the energy storage module 400 is released, achieving the purpose of charging the energy storage battery 110.

[0069] In some embodiments, the second switching unit 320 includes an eighth switching transistor Q8 and a seventeenth resistor R17. The control end of the eighth switching transistor Q8 and the first end of the seventeenth resistor R17 are commonly connected to the freewheeling drive unit 310. The first end of the eighth switching transistor Q8 is connected to the first switching unit 220, and the second end of the eighth switching transistor Q8 and the second end of the seventeenth resistor R17 are grounded.

[0070] In some embodiments, the sixth switching transistor Q6 can be an NPN triode.

[0071] In some embodiments, the fifth switching transistor Q5 can be a PNP triode.

[0072] In some embodiments, the eighth switching transistor Q8 can be an N-type MOS transistor or an IGBT transistor.

[0073] In some embodiments, the energy storage module 400 includes at least one inductor and at least one capacitor. The inductor and the capacitor are connected in parallel, and the at least one inductor and the at least one capacitor form an LC energy storage circuit. The charging switch module 200 is connected to the energy storage battery 110 via at least one inductor. When the charging switch module 200 is turned on, the power input terminal 120 charges the LC energy storage circuit composed of the at least one inductor and the at least one capacitor via the charging switch module 200. When the charging switch module 200 is turned off, the LC energy storage circuit releases electrical energy to charge the energy storage battery 110.

[0074] In some embodiments, referring to Figure 4 as shown, the energy storage module 400 includes a first inductor L1 and a second capacitor C2; the first end of the first inductor L1 is connected to the common node of the charging switch module 200 and the freewheeling switch module 300, the second end of the first inductor L1 and the first end of the second capacitor C2 are commonly connected to the energy storage battery 110, and the second end of the second capacitor C2 is grounded.

[0075] In some embodiments, referring to Figure 4 as shown, the energy storage module 400 may further include a third capacitor C3. The third capacitor C3 is connected in parallel with the second capacitor C2. By setting multiple capacitors, the energy buffer of the energy storage module 400 can be increased, and a large impact on the energy storage battery 110 caused by the input current pulse can be avoided.

[0076] In some embodiments, referring to Figure 5 as shown, the battery current detection unit 530 includes a current sampling sub-unit 531, a sampling amplification sub-unit 532, and a signal processing sub-unit 533. The current sampling sub-unit 531 is connected to the energy storage battery 110. The current sampling sub-unit 531 is configured to convert the current flowing through the energy storage battery 110 into a corresponding sampling voltage signal; the sampling amplification sub-unit 532 is connected to the current sampling sub-unit 531. The sampling amplification sub-unit 532 is configured to perform amplification processing on the sampling voltage signal to obtain a sampling amplified signal. The signal processing sub-unit 533 is connected to the sampling amplification sub-unit 532 and the control unit 540. The signal processing sub-unit 533 is configured to perform filtering processing on the sampling amplified signal to obtain a battery current sampling signal and output it to the control unit 540.

[0077] In some embodiments, referring to Figure 5 as shown, the current sampling sub-unit 531 includes a twentieth resistor R20. The twentieth resistor R20 is connected between the negative electrode VBAT- of the energy storage battery 110 and the ground. By detecting the voltage across the twentieth resistor R20, the current flowing through the energy storage battery 110 can be detected. In this way, the current flowing through the energy storage battery 110 can be converted into a corresponding sampling voltage signal.

[0078] In some embodiments, referring to Figure 5As shown, the sampling and amplifying subunit 532 includes a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, and an operational amplifier U0. The first end of the twenty-first resistor R21 is connected to the first end of the twentieth resistor R20. The second end of the twenty-first resistor R21 and the first end of the twenty-third resistor R23 are commonly connected to the non-inverting input pin of the operational amplifier U0. The second end of the twenty-third resistor R23 is connected to the reference voltage terminal VREF. The first end of the twenty-second resistor R22 is connected to the second end of the twentieth resistor R20. The second end of the twenty-second resistor R22 and the first end of the twenty-fourth resistor R24 are commonly connected to the inverting input pin of the operational amplifier U0. The output pin of the operational amplifier U0 and the second end of the twenty-fourth resistor R24 are commonly connected.

[0079] In this embodiment, the twenty-first resistor R21, the twenty-second resistor R22, the twenty-third resistor R23, the twenty-fourth resistor R24, and the operational amplifier U0 form an inverting amplifier circuit. The inverting amplifier circuit has the function of amplifying the input signal and outputting it in an inverted manner, and its gain coefficient is related to the ratio of the twenty-fourth resistor R24 to the twenty-second resistor R22.

[0080] In some embodiments, the twenty-fourth resistor R24 and the twenty-second resistor R22 can be adjustable resistors.

[0081] In some embodiments, refer to Figure 5 As shown, the signal processing subunit 533 includes a twenty-fifth resistor R25 and a fourth capacitor C4. The first end of the twenty-fifth resistor R25 is connected to the output end of the sampling and amplifying subunit 532. The second end of the twenty-fifth resistor R25 and the first end of the fourth capacitor C4 are commonly connected to the control unit 540. The second end of the fourth capacitor C4 is grounded.

[0082] In this embodiment, the twenty-fifth resistor R25 and the fourth capacitor C4 form an RC filter circuit. The RC filter circuit is used to filter the voltage signal output by the sampling and amplifying subunit 532.

[0083] In some embodiments, refer to Figure 5 As shown, the input voltage sampling unit 510 includes an eighteenth resistor R18 and a nineteenth resistor R19. The power input terminal 120 is grounded via the eighteenth resistor R18 and the nineteenth resistor R19. The common terminal of the eighteenth resistor R18 and the nineteenth resistor R19 is connected to the control unit 540 for providing an input terminal voltage sampling signal MCU_SPC to the control unit 540.

[0084] In some embodiments, refer to Figure 6As shown in the figure, the battery voltage detection unit 520 includes a twenty-sixth resistor R26, a twenty-seventh resistor R27, and a twenty-eighth resistor R28. The positive terminal of the energy storage battery 110 is grounded via the twenty-sixth resistor R26 and the twenty-seventh resistor R27. The common terminal of the twenty-sixth resistor R26 and the twenty-seventh resistor R27 is connected to the control unit 540 via the twenty-eighth resistor R28, and provides a battery voltage sampling signal MCU_VD to the control unit 540 via the twenty-eighth resistor R28.

[0085] The embodiment of the present application also provides a charging control device, and the charging control device includes the charging control circuit of any one of the above embodiments.

[0086] The embodiment of the present application also provides an energy storage device, and the energy storage device includes: a photovoltaic array, an energy storage battery 110, and the charging control circuit of any one of the above embodiments; a power input terminal 120 is connected to the photovoltaic array.

[0087] Specifically, the photovoltaic array is connected to the power input terminal 120 in the charging control circuit. The photovoltaic array is used to output a voltage to the power input terminal 120 after performing photoelectric conversion. The energy storage device is connected to the output terminal of the charging control circuit as a load.

[0088] By applying the charging control circuit in this embodiment to the energy storage system, the charging efficiency of the energy storage battery 110 in the energy storage system can be improved. For example, the main control module 500 in the charging control circuit can adjust the charging control signal and the freewheeling pulse signal so that the voltage difference between the voltage of the power input terminal 120 and the positive terminal voltage of the energy storage battery 110 is maintained within a preset voltage threshold range, and control the voltage of the power input terminal 120 to be greater than the voltage of the energy storage battery 110, avoiding the problem that the charging power is low when the voltage of the battery deviates greatly from the set value during the charging process of the energy storage battery 110.

[0089] The beneficial effects of the embodiment of the present application: The charging switch module is connected between the power input terminal and the energy storage module. The charging switch module is turned on or off according to the charging control signal to control the energy storage process of the energy storage module. The freewheeling switch module is turned on or off according to the freewheeling pulse signal to control the energy storage module to charge the energy storage battery. The main control module detects the electrical parameters of the power input terminal and the energy storage battery, and adjusts the charging control signal and the freewheeling pulse signal according to the detection results to control the voltage difference between the power input terminal and the energy storage battery to be maintained within a preset voltage threshold range, so that the voltage of the power input terminal is greater than the voltage of the energy storage battery. By adjusting the charging control signal and the freewheeling pulse signal, the charging process is adjusted in real time, and the charging efficiency and charging power of the energy storage battery are improved.

[0090] In the above embodiments, the descriptions of the respective embodiments each have their own emphasis. For parts not described in detail or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0091] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A charging control circuit connected to an energy storage battery, characterized in that: The charging control circuit comprises: Power input terminal, used to connect to external power supply; An energy storage module connected to the energy storage battery; A charging switch module, connected between the power input terminal and the energy storage module, and used to switch on or off according to a charging control signal to control the charging process of the energy storage module by the external power supply; A freewheeling switch module, connected to the energy storage module, and used to be turned on or off according to a freewheeling pulse signal, so as to control the process of the energy storage module charging the energy storage battery; The main control module is used to detect the electrical parameters of the power input terminal and the energy storage battery, and adjust the charging control signal and the freewheeling pulse signal according to the detection results to control the voltage difference between the power input terminal and the energy storage battery to remain within a preset voltage threshold range, and the main control module controls the charging switch module and the freewheeling switch module to be alternately turned on.

2. The charging control circuit according to claim 1, characterized in that: The charging switch module comprises: A push-pull driving unit, configured to receive a charging control signal and generate a corresponding push-pull driving signal according to the charging control signal; The first switch unit is connected to the push-pull driving unit and is used to be turned on or off according to the push-pull driving signal to control the connection state between the power input terminal and the energy storage module.

3. The charging control circuit according to claim 1, characterized in that: The freewheeling switch module comprises: A freewheeling driving unit, configured to receive a freewheeling pulse signal and generate a corresponding freewheeling driving signal according to the freewheeling pulse signal; The second switch unit is connected to the freewheeling drive unit and is used to be turned on or off according to the freewheeling drive signal to control the charging process of the energy storage module on the energy storage battery.

4. The charging control circuit according to any one of claims 1 to 3, characterized in that: The main control module comprises: An input voltage sampling unit, connected to the power input terminal, and used to sample the voltage of the power input terminal to obtain an input terminal voltage sampling signal; A battery voltage detection unit, used to sample the voltage of the energy storage battery to obtain a battery voltage sampling signal; A battery current detection unit, used to sample the current flowing through the energy storage battery to obtain a battery current sampling signal; A control unit is connected to the input voltage sampling unit, the battery voltage detection unit and the battery current detection unit respectively, and is used to adjust the charging control signal and the freewheeling pulse signal according to the input terminal voltage sampling signal, the battery voltage sampling signal and the battery current sampling signal.

5. The charging control circuit according to claim 2, characterized in that: The push-pull driving unit is a push-pull driving circuit, and the push-pull driving circuit amplifies the charging control signal to obtain the corresponding push-pull driving signal.

6. The charging control circuit according to claim 3, characterized in that: The freewheeling drive unit is a transistor drive circuit, and the transistor drive circuit is used to amplify the freewheeling pulse signal to obtain the corresponding freewheeling drive signal.

7. The charging control circuit according to any one of claims 1 to 3, characterized in that: The energy storage module includes at least one inductor and at least one capacitor, the inductor and the capacitor are arranged in parallel, and the charging switch module is connected to the energy storage battery via at least one inductor.

8. The charging control circuit according to claim 4, characterized in that: The battery current detection unit comprises: A current sampling subunit, connected to the energy storage battery, for converting the current flowing through the energy storage battery into a corresponding sampling voltage signal; A sampling and amplifying subunit, connected to the current sampling subunit, and used to amplify the sampled voltage signal to obtain a sampled and amplified signal; The signal processing subunit is connected to the sampling and amplifying subunit and the control unit, and is used to filter the sampling and amplifying signal to obtain a battery current sampling signal and output it to the control unit.

9. A charging control device, characterized in that: The charging control device comprises the charging control circuit according to any one of claims 1 to 8.

10. An energy storage device, characterized in that: The energy storage device comprises: a photovoltaic array, an energy storage battery and a charging control circuit as described in any one of claims 1 to 8; the power input terminal is connected to the photovoltaic array.

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