High-voltage input series voltage division power supply

Abstract

The utility model discloses a high-voltage input series voltage division power supply 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, an isolated DC power supply DC / DC1 and an isolated DC power supply DC / DC2, wherein the isolated DC power supply DC / DC1 and the isolated DC power supply DC / DC2 are independent. According to the locomotive power supply module, 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 the two isolated DC power supplies DC / DC1 and DC / DC2 in series, and the locomotive power supply module can be decomposed into a mode of connecting two modules in series under the condition of high-voltage input, so that the withstand voltage requirement of the power device used in the power supply module is reduced, and the cost is reduced. And the design of a high-voltage input power supply is simplified.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a power supply with high-voltage input series voltage division. Background Technology

[0002] In locomotive power supplies, the input voltage can reach up to 2000V. This voltage is stepped down by a DC / DC converter and supplied to the corresponding components. Such high voltage presents significant challenges to the design of locomotive power supplies.

[0003] To accommodate this high-voltage input, the power devices selected for the power supply must also meet very high voltage withstand requirements, which greatly limits the number of power devices that can be used and makes the design very difficult.

[0004] In the existing technology, the first approach is to use power devices with higher voltage resistance, which can withstand the voltage stress of 2000V input. However, there are relatively few such devices available, making selection difficult.

[0005] The second approach is to use a three-level circuit topology, which can reduce the voltage stress on individual power devices, but requires significant modifications to existing modules. Utility Model Content

[0006] The main purpose of this invention is to propose a high-voltage input series voltage divider power supply, which aims to solve the problem of insufficient voltage withstand capability of a single module power device under high-voltage input conditions by using two DC / DC modules connected in series, and to simplify the design of high-voltage input power supplies.

[0007] To achieve the above objectives, this utility model provides a high-voltage input series voltage divider power supply, including: MCU, capacitor C1, capacitor C2, voltage sampling circuit Vm1, voltage sampling circuit Vm2, current sampling circuit Am1, current sampling circuit Am2, resistor R1, and two independent isolated DC power supplies DC / DC1 and DC / DC2.

[0008] The isolated DC power supplies DC / DC1 and DC / DC2 are connected in series to the high-voltage input V_DC. Capacitor C1 is connected in parallel across the positive and negative input terminals of isolated DC power supply DC / DC1, and capacitor C2 is connected in parallel across the input terminals of isolated DC power supply DC / DC2. Capacitors C1 and C2 are connected in series to the positive and negative terminals of the high-voltage input V_DC. The connection point between Vin- of isolated DC power supply DC / DC1 and Vin+ of isolated DC power supply DC / DC2 is connected to the connection point of capacitors C1 and C2. Voltage sampling circuit Vm1 is used to detect the voltage across capacitor C1, and voltage sampling circuit Vm2 is used to detect the voltage across capacitor C2. The outputs of isolated DC power supplies DC / DC1 and DC / DC2 are connected in parallel to R1. Current sampling circuit Am1 detects the output current of isolated DC power supply DC / DC1, and current sampling circuit Am2 detects the output current of isolated DC power supply DC / DC2.

[0009] The MCU is connected to 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 / DC2.

[0010] A further technical solution of this utility model is that the voltage sampling circuit Vm1 and voltage sampling circuit Vm2 are operational amplifiers.

[0011] A further technical solution of this utility model is that the current sampling circuit Am1 and the current sampling circuit Am2 adopt Hall effect sensors.

[0012] The beneficial effects of this high-voltage input series voltage divider power supply are:

[0013] This invention solves the problem of insufficient voltage withstand capability of a single module's power devices under high-voltage input conditions by using two isolated DC power supplies, DC / DC1 and DC / DC2, connected in series. Under high-voltage input conditions, the locomotive power module can be decomposed into two modules connected in series, which reduces the voltage withstand requirement of the power devices used inside the power module and simplifies the design of the high-voltage input power supply. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a circuit structure diagram of a preferred embodiment of the high-voltage input series voltage divider power supply of this utility model.

[0016] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] This utility model proposes a high-voltage input series voltage divider power supply, such as... Figure 1 As shown, the preferred embodiment of the high-voltage input series voltage divider power supply of this utility model includes: MCU, capacitor C1, capacitor C2, voltage sampling circuit Vm1, voltage sampling circuit Vm2, current sampling circuit Am1, current sampling circuit Am2, resistor R1, and two independent isolated DC power supplies DC / DC1 and DC / DC2.

[0019] The isolated DC power supplies DC / DC1 and DC / DC2 are connected in series to the high-voltage input V_DC. Capacitor C1 is connected in parallel across the positive and negative input terminals of isolated DC power supply DC / DC1, and capacitor C2 is connected in parallel across the input terminals of isolated DC power supply DC / DC2. Capacitors C1 and C2 are connected in series to the positive and negative terminals of the high-voltage input V_DC. The connection point between Vin- of isolated DC power supply DC / DC1 and Vin+ of isolated DC power supply DC / DC2 is connected to the connection point of capacitors C1 and C2. Voltage sampling circuit Vm1 is used to detect the voltage across capacitor C1, and voltage sampling circuit Vm2 is used to detect the voltage across capacitor C2. The outputs of isolated DC power supplies DC / DC1 and DC / DC2 are connected in parallel to R1. Current sampling circuit Am1 detects the output current of isolated DC power supply DC / DC1, and current sampling circuit Am2 detects the output current of isolated DC power supply DC / DC2.

[0020] The MCU is connected to the voltage sampling circuit Vm1, voltage sampling circuit Vm2, current sampling circuit Am1, current sampling circuit Am2, and two independent isolated DC power supplies DC / DC1 and DC / DC2. Specifically, the voltage sampling circuit Vm1 is connected to the MCU's ADC pin, the voltage sampling circuit Vm2 is connected to the MCU's ADC1 pin, the current sampling circuit Am1 is connected to the MCU's ADC2 pin, the current sampling circuit Am2 is connected to the MCU's ADC3 pin, the isolated DC power supply DC / DC1 is connected to the MCU's CTR11 pin, and the isolated DC power supply DC / DC2 is connected to the MCU's CTR12 pin.

[0021] In this embodiment, the voltage sampling circuit Vm1, voltage sampling circuit Vm2, current sampling circuit Am1, and current sampling circuit Am2 respectively send the detection signal to the MCU, and the MCU compares the voltage difference between Vm1 and Vm2.

[0022] If Vm1-Vm2>0, the MCU sends an instruction to the isolated DC power supply DC / DC1 to reduce the output of the voltage sampling circuit Vm1. This reduces the energy used by the load of capacitor C1 during the high-frequency cycle, resulting in a higher voltage distribution on capacitor C1 in V_DC.

[0023] If Vm1-Vm2<0, the MCU sends an instruction to the isolated DC power supply DC / DC1 to increase the output of the voltage sampling circuit Vm1. This will increase the energy used by the load of capacitor C1 during the high-frequency cycle, thus reducing the voltage distributed on V_DC by capacitor C1.

[0024] This ensures that the voltages on capacitors C1 and C2 are equal. By changing the capacitance values ​​of capacitors C1 and C2 under different loads and different adjustment cycles, the input voltages of the isolated DC power supply DC / DC1 and the isolated DC power supply DC / DC2 remain basically equivalent, achieving the purpose of high-voltage series voltage division.

[0025] It should be noted that, Figure 1 In the diagram, Vm1 and Vm2 are voltage sampling circuits (such as operational amplifiers) and devices that generate voltage sampling signals, while Am1 and Am2 are current sampling circuits (such as Hall effect sensors) and devices that generate current sampling signals.

[0026] In summary, this utility model solves the problem of insufficient voltage withstand capability of a single module's power devices under high-voltage input conditions by using two isolated DC power supplies, DC / DC1 and DC / DC2, connected in series. Under high-voltage input conditions, the locomotive power module can be decomposed into two modules connected in series, which reduces the voltage withstand requirement of the power devices used inside the power module and simplifies the design of the high-voltage input power supply.

[0027] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A high-voltage input series voltage divider power supply, characterized in that, include: MCU, capacitor C1, capacitor C2, voltage sampling circuit Vm1, voltage sampling circuit Vm2, current sampling circuit Am1, current sampling circuit Am2, resistor R1, and two independent isolated DC power supplies DC / DC1 and DC / DC2. The isolated DC power supplies DC / DC1 and DC / DC2 are connected in series to the high-voltage input V_DC. Capacitor C1 is connected in parallel across the positive and negative input terminals of isolated DC power supply DC / DC1, and capacitor C2 is connected in parallel across the input terminals of isolated DC power supply DC / DC2. Capacitors C1 and C2 are connected in series to the positive and negative terminals of the high-voltage input V_DC. The connection point between Vin- of isolated DC power supply DC / DC1 and Vin+ of isolated DC power supply DC / DC2 is connected to the connection point of capacitors C1 and C2. Voltage sampling circuit Vm1 is used to detect the voltage across capacitor C1, and voltage sampling circuit Vm2 is used to detect the voltage across capacitor C2. The outputs of isolated DC power supplies DC / DC1 and DC / DC2 are connected in parallel to R1. Current sampling circuit Am1 detects the output current of isolated DC power supply DC / DC1, and current sampling circuit Am2 detects the output current of isolated DC power supply DC / DC2. The MCU is connected to 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 / DC2.

2. The high-voltage input series voltage divider power supply according to claim 1, characterized in that, The voltage sampling circuits Vm1 and Vm2 employ operational amplifiers.

3. The high-voltage input series voltage divider power supply according to claim 1, characterized in that, The current sampling circuits Am1 and Am2 employ Hall effect sensors.

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