CN-120389610-B - Low-loss conversion circuit and energy storage system

CN120389610BCN 120389610 BCN120389610 BCN 120389610BCN-120389610-B

Abstract

The application relates to a low-loss conversion circuit and an energy storage system. The power supply control system comprises a voltage reducing module, a bypass module, an adjusting module and a control module, wherein the voltage reducing module is connected with a power supply, the bypass module is connected with the voltage reducing module in parallel, the adjusting module is used for detecting the input voltage of the power supply, outputting a dynamic adjusting signal to a feedback pin of the control module based on the input voltage, outputting a first control signal to the bypass module when the input voltage is larger than or equal to a reference voltage, outputting a second control signal to the bypass module when the input voltage is smaller than the reference voltage, the bypass module is used for working under the action of the second control signal to bypass the voltage reducing module, and stopping working under the action of the first control signal, the control module is used for adjusting the duty ratio of a first driving signal output to the voltage reducing module to be in a preset range based on the dynamic adjusting signal, and the voltage reducing module is used for outputting the power supply voltage after the voltage is reduced based on the first driving signal. The method can improve the utilization rate of the electric quantity of the battery.

Inventors

YOU YONGLIANG
CHEN ZHIBIN
YANG JINCHANG
YU PAN

Assignees

深圳市德兰明海新能源股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250630

Claims (8)

1. The low-loss conversion circuit is characterized by comprising a voltage reduction module connected with a power supply, a bypass module connected with the voltage reduction module in parallel, an adjusting module and a control module; The adjusting module is used for detecting the input voltage of the power supply; outputting a dynamic adjustment signal to a feedback pin of the control module based on the input voltage, and outputting a first control signal to the bypass module when the input voltage is greater than or equal to a reference voltage; the control module comprises a feedback regulation unit, an enabling control subunit and an adjustable voltage dividing unit, wherein the feedback regulation unit is used for outputting the dynamic regulation signal to a feedback pin of the control module based on the input voltage, the enabling control subunit is used for outputting a first enabling signal to an enabling pin of the control module under the action of the first control signal and outputting a second enabling signal to an enabling pin of the control module under the action of the second control signal, the adjustable resistance corresponding to the adjustable voltage dividing unit is reduced along with the increase of the input voltage, and the adjustable voltage dividing unit is used for dividing the input voltage through the adjustable resistance to obtain the dynamic regulation signal; The bypass module is used for working under the action of the second control signal so as to bypass the step-down module, and stopping working under the action of the first control signal; The control module is used for adjusting the duty ratio of the first driving signal output to the voltage reduction module to be in a preset range based on the dynamic adjusting signal; the voltage reducing module is used for reducing the input voltage based on the first driving signal and then outputting a power supply voltage.
2. The low-loss switching circuit according to claim 1, wherein the bypass module comprises a switching unit and a driver; The first end of the switch unit is connected with a power supply, the second end of the switch unit is connected with the output end of the circuit, and the control end of the switch unit is connected with the output end of the driver; The input end of the driver is connected with the adjusting module, and the output end of the driver is connected with the control end of the switch unit; the switch unit is used for being conducted under the action of the second control signal and being turned off under the action of the first control signal.
3. The low-loss switching circuit according to claim 1 or 2, wherein the adjusting module is further configured to output a first enable signal to the enable terminal of the control module when the input voltage is greater than or equal to a reference voltage, so that the control module adjusts the duty ratio of the first driving signal output to the step-down module to be within a preset range based on the dynamic adjusting signal, and output a second enable signal to the enable terminal of the control module when the input voltage is less than the reference voltage, so that the control module stops operating.
4. The low-loss switching circuit of claim 1, wherein the conditioning module further comprises: The voltage sampling unit is used for collecting the input voltage; A comparison unit configured to output the second control signal when the input voltage is less than the reference voltage, and output the first control signal when the input voltage is greater than or equal to the reference voltage; The input end of the enabling control subunit is connected with the output end of the comparing unit, and the input end of the adjustable voltage dividing unit is connected with the voltage sampling unit.
5. The low-loss switching circuit according to claim 4, wherein the voltage sampling unit comprises a fifth resistor, a seventh resistor, and a voltage follower; The first end of the fifth resistor is connected with a power supply, the second end of the fifth resistor is connected with the first end of the seventh resistor and the non-inverting input end of the voltage follower, the second end of the seventh resistor is grounded, and the inverting input end of the voltage follower is connected with the output end of the voltage follower.
6. The low-loss switching circuit according to claim 4, wherein the second control signal is a high level signal and the first control signal is a low level signal, the comparing unit comprising: The inverting input end of the comparator is connected with the voltage sampling unit, the non-inverting input end of the comparator is connected with a reference power supply, the output end of the comparator is connected with the bypass module, and the comparator is used for outputting the high-level signal when the input voltage is smaller than the reference voltage and outputting the low-level signal when the input voltage is larger than or equal to the reference voltage.
7. The low-loss switching circuit according to claim 1, wherein, The control module is used for adjusting the duty ratio of the first driving signal output to the voltage reduction module to be in the preset range when the voltage of the dynamic adjustment signal is smaller than a preset value.
8. An energy storage system, wherein the energy storage system comprises the low-loss conversion circuit as claimed in any one of claims 1 to 7, and the circuit output end of the low-loss conversion circuit is connected with a plurality of direct current output interfaces of the energy storage system.

Description

Low-loss conversion circuit and energy storage system Technical Field The application relates to the technical field of energy storage power supplies, in particular to a low-loss conversion circuit and an energy storage system. Background At present, for an energy storage power supply with A wider input voltage range, for example, the input voltage range is between 24V and 43V, in order to meet the requirements of direct current output function control modules such as USB-C (universal serial bus-C Type interface, universal Serial Bus-Type C), USB-A (universal serial bus-A Type interface, universal Serial Bus-Type A), cigar lighter and the like with A withstand voltage of maximum 40V, A one-stage BUCK circuit (BUCK Type switching regulator circuit, buck Switching Regulator Circuit) is added between A battery and the direct current output functions, and the output voltage of the BUCK circuit is fixed, for example, 22V. However, in the BUCK circuit, when the input voltage is higher (e.g. 43V), the current generates larger loss through the first diode, and when the input voltage is lower (24-29V), although the BUCK circuit voltage-reducing loss can be avoided by directly supplying power to the battery theoretically, the traditional working mode cannot avoid the unnecessary loss, so that the energy storage power supply has larger loss or unnecessary loss in the BUCK circuit part, and the battery power utilization rate is reduced. Disclosure of Invention In view of the foregoing, it is desirable to provide a low-loss conversion circuit and an energy storage system. In a first aspect, the present application provides a low-loss conversion circuit comprising: the system comprises a voltage reducing module connected with a power supply, a bypass module connected with the voltage reducing module in parallel, an adjusting module and a control module; The control module is used for detecting the input voltage of the power supply, outputting a dynamic adjustment signal to a feedback pin of the control module based on the input voltage, and outputting a first control signal to the bypass module when the input voltage is greater than or equal to a reference voltage; The bypass module is used for working under the action of the second control signal so as to bypass the step-down module, and stopping working under the action of the first control signal; The control module is used for adjusting the duty ratio of the first driving signal output to the voltage reduction module to be in a preset range based on the dynamic adjusting signal; the voltage reducing module is used for reducing the input voltage based on the first driving signal and then outputting a power supply voltage. In one embodiment, the bypass module includes a switching unit and a driver; The first end of the switch unit is connected with a power supply, the second end of the switch unit is connected with the output end of the circuit, and the control end of the switch unit is connected with the output end of the driver; The input end of the driver is connected with the adjusting module, and the output end of the driver is connected with the control end of the switch unit; the switch unit is used for being conducted under the action of the second control signal and being turned off under the action of the first control signal. In one embodiment, the adjusting module is further configured to output a first enable signal to the enable end of the control module when the input voltage is greater than or equal to a reference voltage, so that the control module adjusts the duty ratio of the first driving signal output to the voltage reducing module to be in a preset range based on the dynamic adjusting signal, and output a second enable signal to the enable end of the control module when the input voltage is less than the reference voltage, so that the control module stops working. In one embodiment, the adjustment module comprises: The voltage sampling unit is used for collecting the input voltage; A comparison unit configured to output the second control signal when the input voltage is less than the reference voltage, and output the first control signal when the input voltage is greater than or equal to the reference voltage; And the feedback regulation unit is used for outputting the dynamic regulation signal to a feedback pin of the control module based on the input voltage. In one embodiment, the voltage sampling unit comprises a fifth resistor, a seventh resistor and a voltage follower; The first end of the fifth resistor is connected with a power supply, the second end of the fifth resistor is connected with the first end of the seventh resistor and the non-inverting input end of the voltage follower, the second end of the seventh resistor is grounded, and the inverting input end of the voltage follower is connected with the output end of the voltage follower. In one embodiment, the second control signal is a high level signal, the first control signal is a