CN-224218282-U - High-voltage input series voltage-dividing power supply

Abstract

The utility model discloses a power supply with high-voltage input and series voltage division, which comprises an MCU, a capacitor C1, a capacitor C2, a voltage sampling circuit Vm1, a voltage sampling circuit Vm2, a current sampling circuit Am1, a current sampling circuit Am2, a resistor R1, and two independent isolated DC power supplies DC/DC1 and DC/DC2. According to the utility model, the problem of insufficient withstand voltage of a single module power device under the condition of high-voltage input is solved by adopting a mode of connecting two isolated DC power supplies DC/DC1 and DC/DC2 in series, and under the condition of high-voltage input, a locomotive power supply module can be decomposed into two modules in series, so that the withstand voltage requirement of the power device used in the power supply module is reduced, and the design of the high-voltage input power supply is simplified.

Inventors

• WANG CHUNTIAN
• FU RENDE
• TANG ZHONG

Assignees

• 深圳市福瑞电气有限公司

Dates

Publication Date

20260508

Application Date

20250529

Claims (3)

1. 1. The power supply with high-voltage input and series voltage division is characterized by comprising an MCU, a capacitor C1, a capacitor C2, a voltage sampling circuit Vm1, a voltage sampling circuit Vm2, a current sampling circuit Am1, a current sampling circuit Am2, a resistor R1, and two independent isolated DC power supplies DC/DC1 and DC/DC2; The isolated DC power supply DC/DC1 and the isolated DC power supply DC/DC2 are connected in series to a high-voltage input V_DC, the capacitor C1 is connected in parallel to the positive end and the negative end of the input of the isolated DC power supply DC/DC1, the capacitor C2 is connected in parallel to the positive end and the negative end of the input of the isolated DC power supply DC/DC2, the Vin-of the isolated DC power supply DC/DC1 and the vin+ connection point of the isolated DC power supply DC/DC2 are connected to the positive end and the negative end of the high-voltage input V_DC, the Vin-of the isolated DC power supply DC/DC1 and the connection point of the capacitor C1 and the capacitor C2 are connected in series, the voltage sampling circuit Vm1 is used for detecting the voltage at the two ends of the capacitor C1, the voltage sampling circuit Vm2 is used for detecting the voltage at the two ends of the capacitor C2, the isolated DC power supply DC/DC1 and the isolated DC power supply DC/DC2 are connected in parallel to the R1, the current sampling circuit Am1 detects the output current of the isolated DC power supply DC/DC1, and the current sampling circuit Am2 detects the output current of the isolated DC power supply DC/DC 2. The MCU is respectively connected with the voltage sampling circuit Vm1, the voltage sampling circuit Vm2, the current sampling circuit Am1, the current sampling circuit Am2, and two independent isolated DC power supplies DC/DC1 and DC/DC 2.
2. 2. The high-voltage input series-divided power supply according to claim 1, wherein the voltage sampling circuit Vm1 and the voltage sampling circuit Vm2 employ operational amplifiers.
3. 3. The high-voltage input series-divided power supply according to claim 1, wherein the current sampling circuit Am1 and the current sampling circuit Am2 employ hall.

Description

High-voltage input series voltage-dividing power supply Technical Field The utility model relates to the technical field of power supplies, in particular to a high-voltage input series voltage-dividing power supply. Background In locomotive power supply, the input voltage can reach 2000V at most, and the input voltage is reduced to corresponding bujian for use through DC/DC conversion of the power supply. Such high voltages present significant difficulties in the design of locomotive power supplies. In order to adapt to the high-voltage input, the voltage-resistant requirement of the selection of the power devices in the power supply is very high, so that the number of the power devices which can be selected is very small, and great difficulty is brought to design. In the prior art, the first mode is to adopt a power device with higher withstand voltage, which can bear the voltage stress of 2000V input, but the corresponding devices are fewer and difficult to select. The second approach is to use a three-level circuit topology that reduces the voltage stress of individual power devices, but the modification to the already formed modules can be relatively large. Disclosure of utility model The utility model mainly aims to provide a power supply with high-voltage input and series voltage division, and aims to solve the problem of insufficient withstand voltage of a single module power device under the condition of high-voltage input by using a mode of connecting two DC/DC modules in series, and simplify the design of the high-voltage input power supply. In order to achieve the aim, the utility model provides a power supply with high-voltage input and series voltage division, which comprises an MCU, a capacitor C1, a capacitor C2, a voltage sampling circuit Vm1, a voltage sampling circuit Vm2, a current sampling circuit Am1, a current sampling circuit Am2, a resistor R1, and two independent isolated DC power supplies DC/DC1 and DC/DC2; The isolated DC power supply DC/DC1 and the isolated DC power supply DC/DC2 are connected in series to a high-voltage input V_DC, the capacitor C1 is connected in parallel to the positive end and the negative end of the input of the isolated DC power supply DC/DC1, the capacitor C2 is connected in parallel to the positive end and the negative end of the input of the isolated DC power supply DC/DC2, the Vin-of the isolated DC power supply DC/DC1 and the vin+ connection point of the isolated DC power supply DC/DC2 are connected to the positive end and the negative end of the high-voltage input V_DC, the Vin-of the isolated DC power supply DC/DC1 and the connection point of the capacitor C1 and the capacitor C2 are connected in series, the voltage sampling circuit Vm1 is used for detecting the voltage at the two ends of the capacitor C1, the voltage sampling circuit Vm2 is used for detecting the voltage at the two ends of the capacitor C2, the isolated DC power supply DC/DC1 and the isolated DC power supply DC/DC2 are connected in parallel to the R1, the current sampling circuit Am1 detects the output current of the isolated DC power supply DC/DC1, and the current sampling circuit Am2 detects the output current of the isolated DC power supply DC/DC 2. The MCU is respectively connected with the voltage sampling circuit Vm1, the voltage sampling circuit Vm2, the current sampling circuit Am1, the current sampling circuit Am2, and two independent isolated DC power supplies DC/DC1 and DC/DC 2. The further technical scheme of the utility model is that the voltage sampling circuit Vm1 and the voltage sampling circuit Vm2 adopt operational amplifiers. The utility model further adopts the technical scheme that the current sampling circuit Am1 and the current sampling circuit Am2 adopt Hall. The high-voltage input series voltage-dividing power supply has the beneficial effects that: According to the utility model, the problem of insufficient withstand voltage of a single module power device under the condition of high-voltage input is solved by adopting a mode of connecting two isolated DC power supplies DC/DC1 and DC/DC2 in series, and under the condition of high-voltage input, a locomotive power supply module can be decomposed into two modules in series, so that the withstand voltage requirement of the power device used in the power supply module is reduced, and the design of the high-voltage input power supply is simplified. Drawings In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art. FIG. 1 is a schematic circuit diagram of a power supply with