Bus power-taking auxiliary power supply circuit
By employing dual auxiliary power supplies in high-voltage power electronic devices and combining them with inverter modules and DC-DC converter modules, high input voltage is converted into low-range voltage, solving the problems of complex auxiliary power supply structure and high cost, and achieving efficient power conversion.
Patent Information
- Application Number
- CN202423134973.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In existing high-voltage power electronic devices, the auxiliary power supply structure is complex, expensive and inefficient, especially due to the high cost and low efficiency of the switching transistors caused by high input voltage.
The system employs dual auxiliary power supplies connected to the positive and negative terminals of the DC power supply bus, respectively. The input voltage is converted to a lower range through an inverter module and a DC-DC converter module. Lower power MOSFETs are used, simplifying the circuit structure and improving conversion efficiency.
It effectively reduces input voltage, decreases device heat generation, lowers costs, improves auxiliary power supply conversion efficiency, and simplifies circuit structure.
Smart Images
Figure CN223639174U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to power electronics technical field, especially related to a bus power supply auxiliary power supply circuit. BACKGROUND
[0002] At present in high voltage power electronics device system, such as cascaded energy storage device, power electronic transformer etc., the power module in it needs auxiliary power supply, and the most convenient and most popular at present is through the switching power supply with higher input voltage to take power on the full bus capacitor in the power module, the switching voltage input voltage of this kind of switching power supply is usually 200V~1500V wide range input, the power is not greater than 50W, and has the isolation function simultaneously, usually adopts flyback isolation topology, in order to satisfy higher input voltage, the switching tube of this kind of switching power supply is usually connected with multi-terminal isolation transformer in the form of multiple series, and adopts expensive high voltage switching tube, which leads to the switching power supply with complex structure, high price, low efficiency and other shortcomings. UTILITARY MODEL
[0003] The utility model discloses a bus power supply auxiliary power supply circuit.
[0004] The utility model provides a bus power supply auxiliary power supply circuit, which comprises:
[0005] The power supply DC bus comprises a positive terminal BUS+, a neutral line BUSN and a negative terminal BUS-, and the auxiliary power supply.
[0006] The auxiliary power supply comprises a first auxiliary power supply and a second auxiliary power supply, the first auxiliary power supply is connected with the positive terminal BUS+ and the neutral line BUSN, and the second auxiliary power supply is connected with the negative terminal BUS- and the neutral line BUSN.
[0007] Further, a positive bus capacitor is connected between the positive terminal BUS+ and the neutral line BUSN, and a negative bus capacitor is connected between the negative terminal BUS- and the neutral line BUSN.
[0008] Further, an AC source is connected to one end of the power supply DC bus, an inverter module is connected between the AC source and the power supply DC bus, and the inverter module is used to convert AC power output by the AC source into DC power.
[0009] Further, a DC source is connected to the other end of the power supply DC bus, a DC conversion module is connected between the DC source and the power supply DC bus, and the DC conversion module is used to change the DC voltage output by the DC source.
[0010] Compared with the prior art, the utility model has the advantages that:
[0011] The utility model discloses two auxiliary power supplies are connected to the positive terminal BUS+ of power supply direct current bus and the negative terminal BUS- of power supply direct current bus respectively, can solve the problem of positive and negative bus voltage uneven in the process of power on, and two auxiliary power supplies convert the input voltage of power supply direct current bus from 200V~1500V to 100V~750V, effectively reduce the input voltage, when selecting auxiliary power supply, can select the auxiliary power supply of lower power MOS tube, reduce the volume of flyback transformer, improve the conversion efficiency of auxiliary power supply, reduce the heat output of device, solve the high input voltage, complex structure, low efficiency and other shortcomings of conventional energy extraction power supply. BRIEF DESCRIPTION OF DRAWINGS
[0012] The following drawings only make the illustrative description and explanation of the utility model, and do not use to limit the range of the utility model, wherein:
[0013] Figure 1 The utility model discloses circuit connection schematic diagram;
[0014] In the drawing: 1, inverter module;2, positive bus capacitor;3, negative bus capacitor;4, auxiliary power supply;5, auxiliary power supply;6, direct current conversion module;7, direct current source;8, alternating current source. DETAILED DESCRIPTION
[0015] In order to make the purpose, technical scheme, design method and advantage of the utility model more clear and obvious, the following further detailed description of the utility model is combined with the drawings through specific embodiment. It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.
[0016] As Figure 1 The utility model discloses a bus power extraction auxiliary power supply circuit, including power supply direct current bus, the power supply direct current bus includes positive terminal BUS+, neutral line BUSN, negative terminal BUS-, the auxiliary power supply;
[0017] Auxiliary power supply, the auxiliary power supply includes first auxiliary power supply 4 and second auxiliary power supply 5, the first auxiliary power supply 4 is connected with the positive terminal BUS+ and neutral line BUSN, and the second auxiliary power supply 5 is connected with the negative terminal BUS- and neutral line BUSN.
[0018] In order to stabilize the voltage of power supply direct current bus positive and negative end, the positive bus capacitor 2 is connected between the positive terminal BUS+ and neutral line BUSN, the negative bus capacitor 3 is connected between the negative terminal BUS- and neutral line BUSN, after inverter module 1 converts alternating current into direct current, the direct current output possibly fluctuates, and the positive bus capacitor 2 and the negative bus capacitor 3 can smooth the direct current voltage, reduce voltage ripple, and ensure the stability of direct current bus voltage.
[0019] In the embodiment, in order to realize the bidirectional conduction between the direct current source 7 and the alternating current source 8, the alternating current source 8 is connected to one end of the power supply direct current bus, the alternating current source 8 and the power supply direct current bus are connected with the inverter module 1, and the inverter module 1 is used to convert the alternating current output by the alternating current source 8 into direct current. Specifically, the positive end BUS+ and the negative end BUS- of the power supply direct current bus are connected with the inverter module 1 respectively, the direct current source 7 is connected to the other end of the power supply direct current bus, the direct current source 7 and the power supply direct current bus are connected with the direct current conversion module 6, and the direct current conversion module 6 is used to perform conversion processing on the input direct current voltage. Specifically, the positive end BUS+ and the negative end BUS- of the power supply direct current bus are connected with the direct current conversion module 6 respectively. For example, it can convert one direct current voltage value into another direct current voltage value to meet the voltage requirements of different circuit modules. When the direct current is transmitted between the power supply direct current bus, the first auxiliary power supply 4 and the second auxiliary power supply 5 can take power on the direct current converted by the inverter module 1 or the direct current boosted or reduced by the direct current conversion module 6.
[0020] Since the auxiliary power supply is used to supply power to the rear-stage device of the circuit alone, by connecting the two auxiliary power supplies to the positive end BUS+ of the power supply direct current bus and the negative end BUS- of the power supply direct current bus respectively, the output voltage of the first auxiliary power supply 4 and the second auxiliary power supply 5 can be set alone according to the power consumption requirements of the rear-stage device. For example, in an embodiment, the driving circuit power supply requires +15V voltage, and the control board power supply requires +5V voltage. The first auxiliary power supply 4 can be set to provide +15V for the driving circuit power supply, and the second auxiliary power supply 5 can be set to provide +5V for the control board power supply. In the conventional auxiliary power supply circuit, only one auxiliary power supply is arranged, and the auxiliary power supply is connected with the positive end BUS+ and the negative end BUS-, so that an external DC-DC needs to be arranged to adjust the output voltage of the auxiliary power supply. Moreover, since the first auxiliary power supply 4 is connected with the positive end BUS+ and the neutral line BUSN, and the second auxiliary power supply 5 is connected with the negative end BUS- and the neutral line BUSN, the input voltage of the power supply direct current bus is converted from 200V-1500V to 100V-750V, and a lower-power MOS tube auxiliary power supply can be selected, thereby reducing the circuit cost.
[0021] The above has described various embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements in the technology in the market, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.
Claims
1. A bus power take-off auxiliary power supply circuit, characterized by, Comprise: Power supply DC bus, the power supply DC bus includes positive terminal BUS+, neutral line BUSN, negative terminal BUS-, the auxiliary power supply; The auxiliary power supply includes first auxiliary power supply (4) and second auxiliary power supply (5), the first auxiliary power supply (4) is connected with the positive terminal BUS+ and neutral line BUSN, the second auxiliary power supply (5) is connected with the negative terminal BUS- and neutral line BUSN.
2. The bus power taking auxiliary power supply circuit according to claim 1, characterized in that, The positive terminal BUS+ and neutral line BUSN are connected with positive bus capacitor (2), the negative terminal BUS- and neutral line BUSN are connected with negative bus capacitor (3).
3. The bus power supply auxiliary power supply circuit according to claim 1, characterized in that, One end of the power supply DC bus is connected with AC source (8), and an inverter module (1) is connected between the AC source (8) and the power supply DC bus, and the inverter module (1) is used to convert the AC power output by the AC source (8) into DC power.
4. The bus power supply auxiliary power supply circuit according to claim 1, characterized in that, The other end of the power supply DC bus is connected with DC source (7), and a DC conversion module (6) is connected between the DC source (7) and the power supply DC bus, and the DC conversion module (6) is used to change the DC voltage output by the DC source (7).