An energy storage dc conversion circuit

Abstract

The utility model relates to power supply circuit technical field discloses a kind of energy storage direct current conversion circuits, including one input terminal and the DCDC module of input power negative pole connection, another input terminal of the DCDC module is connected with input power positive pole by manual switch, the output of the DCDC module is connected with BMS, the manual switch is connected with the power supply switch component for controlling circuit on-off in parallel, the control end of the power supply switch component is connected with the BMS, the BMS is connected with pre-charging control assembly;The utility model effectively avoids battery energy depletion or overdischarge risk, simultaneously reduces production cost.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, specifically to an energy storage DC-DC conversion circuit. Background Technology

[0002] With the booming energy storage industry, there are more and more home energy storage system products, but there are shortcomings in the product system solutions: In terms of system application, even when the system is turned off, the DC-DC power module continues to consume battery system energy at a low power, resulting in a defect in the system solution. When left unused for a long time, the DC-DC can completely consume the battery energy, and there is even a risk of over-discharging the battery. Utility Model Content

[0003] The purpose of this invention is to provide an energy storage DC-DC converter circuit that effectively avoids the risk of battery depletion or over-discharge while reducing production costs.

[0004] This utility model is implemented as follows:

[0005] An energy storage DC-DC converter circuit includes a DC-DC module whose input terminal is connected to the negative terminal of an input power supply. Another input terminal of the DC-DC module is connected to the positive terminal of the input power supply via a manual switch. The output terminal of the DC-DC module is connected to a BMS. A power supply switch component for controlling the on / off state of the circuit is connected in parallel with the manual switch. The control terminal of the power supply switch component is connected to the BMS. A pre-charge control component is connected to the BMS.

[0006] Furthermore, the power supply switch component is a relay.

[0007] Furthermore, the precharge control component includes a precharge switch component whose control terminal is connected to the BMS. The precharge switch component has a precharge resistor connected in parallel and is connected to one end of the input power supply.

[0008] Furthermore, the precharge switch component is a relay.

[0009] Furthermore, one end of the manual switch connected to the DC-DC module is connected to the negative terminal of the input power supply through two series-connected voltage divider resistors. The two ends of the voltage divider resistors connected to the negative terminal of the input power supply are respectively connected to two control terminals of the status detection switch component. One end of the status detection switch component is connected in series with a sampling resistor and then connected to the positive output terminal of the DC-DC module and the BMS. One end of the sampling resistor connected to the status detection switch component is connected to the BMS, and the other end of the status detection switch component is connected to the negative output terminal of the DC-DC module.

[0010] Furthermore, the DC-DC module is wide voltage, operating in the voltage range of 100-700VDC.

[0011] Furthermore, the output of the DC-DC module is connected to a display screen.

[0012] Furthermore, the output of the DC-DC module is connected to an indicator light to indicate that the manual switch is closed.

[0013] Furthermore, the output of the DC-DC module is connected to a reserved interface.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention allows the DC-DC module to output 24V power to the BMS after the manual switch is pressed (for a duration shorter than the manual shutdown time). The BMS then drives the power supply switch to complete the passive startup power supply, preventing the system from continuously keeping the DC-DC module in low-power mode, which would consume battery energy and lead to the risk of over-discharge. In case of undervoltage, the power supply switch can be disconnected to completely shut down the system and avoid battery over-discharge. Since conventional systems based on DC-DC power circuits require a pre-charge function, integrating the pre-charge control component into the circuit allows for deep integration of the DC-DC power board, eliminating the need for a separate external pre-charge circuit. This effectively reduces manufacturing costs while meeting the requirements. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the circuit structure of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] Please see Figure 1 A DC-DC energy storage circuit includes a DC-DC module whose input terminal is connected to the negative terminal of an input power supply. Another input terminal of the DC-DC module is connected to the positive terminal of the input power supply via a manual switch. The output terminal of the DC-DC module is connected to a BMS. A power supply switch component for controlling the on / off state of the circuit is connected in parallel with the manual switch. The control terminal of the power supply switch component is connected to the BMS. A pre-charge control component is connected to the BMS.

[0020] The power supply switch component is a relay or an optocoupler.

[0021] The precharge control component includes a precharge switch component whose control terminal is connected to the BMS. The precharge switch component has a precharge resistor connected in parallel and is connected to one end of the input power supply.

[0022] The precharge switch component is a relay or an optocoupler.

[0023] The manual switch is connected to the DC-DC module at one end via two series-connected voltage divider resistors to the negative terminal of the input power supply. The two ends of the voltage divider resistors connected to the negative terminal of the input power supply are respectively connected to two control terminals of the status detection switch component. One end of the status detection switch component is connected in series with a sampling resistor to the positive output terminal of the DC-DC module and the BMS. The sampling resistor is connected to the BMS at one end, and the other end of the status detection switch component is connected to the negative output terminal of the DC-DC module.

[0024] When the manual switch is closed, the status detection switch component is powered on and conducts. The BMS obtains the status of the manual switch by detecting the voltage of the sampling resistor. The status detection switch component is an optocoupler or a relay.

[0025] The DC-DC module is wide voltage, operating in the voltage range of 100-700VDC.

[0026] The output of the DC-DC module is connected to a display screen.

[0027] The output of the DC-DC module is connected to an indicator light to indicate that the manual switch is closed, indicating that the manual switch has been pressed effectively.

[0028] The output of the DC-DC module is connected to a reserved interface for connecting a fan or other electronic components.

[0029] In practical applications, manually pressing the manual switch ensures the DC-DC module's input voltage is normal, supplying a 24V output voltage to the BMS. Simultaneously, it supplies power to the display screen, an indicator light to show the manual switch's closure, and a reserved interface. The BMS then starts operating. After completing a pre-check, the BMS controls the power supply switch to close and conduct, completing the low-voltage power supply. Releasing the manual switch disconnects the circuit. When the battery voltage is low, the power supply switch shuts off the circuit, preventing the DC-DC power board from depleting the battery or causing over-discharge. The pre-charge control component is integrated with the conversion circuit, increasing integration and reducing costs. The DC-DC module is wide-voltage, operating within a 100-700VDC range, meeting the needs of most low-voltage power supply systems. The pre-charge control component includes a pre-charge switch and a pre-charge resistor; both can be relays or optocouplers. The manual switch connects to the BMS and has a manual switch status output function, allowing the BMS to recognize when the system needs to be shut down and close the power supply switch, thus powering off the system.

[0030] This invention allows the DC-DC module to output 24V power to the BMS after the manual switch is pressed (for a duration shorter than the manual shutdown time). The BMS then drives the power supply switch to complete the passive startup power supply, preventing the system from continuously keeping the DC-DC module in low-power mode, which would consume battery energy and lead to over-discharge risk. In case of undervoltage, the power supply switch can be disconnected to completely shut down the system and prevent battery over-discharge. Since conventional systems based on DC-DC power circuits require a pre-charge function, the pre-charge control component is integrated into the circuit, resulting in deep integration of the DC-DC power board. There is no need for a separate external pre-charge circuit. The manual switch is connected to the BMS and has a manual switch status output function. When the start switch is active (e.g., 3 seconds), the system knows to shut down, and the BMS controls the power supply switch to turn off, thus shutting down the entire circuit.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy storage DC-DC converter circuit, characterized in that: The device includes a DC-DC module with one input terminal connected to the negative terminal of the input power supply. The other input terminal of the DC-DC module is connected to the positive terminal of the input power supply via a manual switch. The output terminal of the DC-DC module is connected to the BMS. The manual switch is connected in parallel with a power supply switch component for controlling the on / off state of the circuit. The control terminal of the power supply switch component is connected to the BMS. The BMS is connected to a precharge control component.

2. The energy storage DC-DC converter circuit according to claim 1, characterized in that, The power supply switch component is a relay.

3. The energy storage DC-DC converter circuit according to claim 1, characterized in that, The precharge control component includes a precharge switch component whose control terminal is connected to the BMS. The precharge switch component has a precharge resistor connected in parallel and is connected to one end of the input power supply.

4. The energy storage DC-DC converter circuit according to claim 3, characterized in that, The precharge switch component is a relay.

5. The energy storage DC-DC converter circuit according to claim 1, characterized in that, The manual switch is connected to the DC-DC module at one end via two series-connected voltage divider resistors to the negative terminal of the input power supply. The two ends of the voltage divider resistors connected to the negative terminal of the input power supply are respectively connected to two control terminals of the status detection switch component. One end of the status detection switch component is connected in series with a sampling resistor to the positive output terminal of the DC-DC module and the BMS. The sampling resistor is connected to the BMS at one end, and the other end of the status detection switch component is connected to the negative output terminal of the DC-DC module.

6. The energy storage DC-DC converter circuit according to claim 1, characterized in that, The DC-DC module is wide voltage, operating in the voltage range of 100-700VDC.

7. The energy storage DC-DC converter circuit according to claim 1, characterized in that, The output of the DC-DC module is connected to a display screen.

8. The energy storage DC-DC converter circuit according to claim 1, characterized in that, The output of the DC-DC module is connected to an indicator light to indicate that the manual switch is closed.

9. The energy storage DC-DC converter circuit according to claim 1, characterized in that, The output of the DC-DC module is connected to a reserved interface.

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