Power module half-bus power-taking auxiliary power supply circuit

Abstract

The utility model discloses a power module half-bus power-taking auxiliary power supply circuit comprising an inversion module, one end of the inversion module is connected with an AC source, and the other end of the inversion module is sequentially connected with a DC conversion module and a DC source through a DC bus unit. The direct-current bus unit is connected with a positive bus capacitor, a bus capacitor and a voltage-sharing resistor in the direction from the inversion module to the direct-current source. The power module half-bus power-taking auxiliary power supply circuit disclosed by the utility model solves the problem of high power supply input voltage caused by a conventional circuit in an energy taking process in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, specifically relating to an auxiliary power supply circuit for power module half-bus power extraction. Background Technology

[0002] Currently, in high-voltage power electronic device systems, such as cascaded energy storage devices and power electronic transformers, the power modules require switching power supplies. The most convenient and popular method is to draw power from the full bus capacitors in the power module using a switching power supply with a higher input voltage. These switching power supplies typically have a wide input voltage range of 200V to 1500V, a power output of no more than 50W, and isolation capabilities. They usually employ a flyback isolation topology. To meet the higher input voltage requirements, the switching transistors in these power supplies are often connected in series with a multi-tap isolation transformer, or high-voltage switching transistors are used. This results in a high input voltage during power extraction. Furthermore, these switching power supplies are complex in structure, expensive, and inefficient. Utility Model Content

[0003] The purpose of this invention is to provide an auxiliary power supply circuit for power module half-bus power extraction, which solves the problem of high power input voltage caused by conventional circuits in the prior art during the power extraction process.

[0004] The technical solution adopted by this utility model is a power module half-bus auxiliary power supply circuit, including an inverter module. One end of the inverter module is connected to an AC source, and the other end of the inverter module is connected to a DC conversion module connected to a DC source through a DC bus unit. The DC bus unit is connected to a positive bus capacitor, a bus capacitor and a voltage equalization resistor along the direction from the inverter module to the DC source.

[0005] The feature of this utility model is that,

[0006] The DC bus unit includes a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus, respectively. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are all connected to the DC-DC converter module. A positive bus capacitor is connected between the BUS+ DC bus and the BUSN DC bus, and a negative bus capacitor is connected between the BUSN DC bus and the BUS- DC bus.

[0007] A voltage equalization resistor is also connected between the BUS+ DC bus and the BUSN DC bus. The voltage equalization resistor is located between the positive bus capacitor and the DC-DC converter module.

[0008] It also includes a switching power supply, one end of which is connected to the BUSN DC bus and the other end to the BUS-DC bus.

[0009] The switching power supply has an input voltage of 100V~750V, an output DC voltage of 15V, and an output power of 50W.

[0010] The inverter module has a rated input voltage of AC650V~900V and an output voltage of DC900V~1300V.

[0011] The DC-DC converter module adopts a Buck-Boost topology, with an input voltage of DC900V~1300V and an output voltage of DC100V~1500V.

[0012] A 500KΩ power resistor is selected as the voltage equalization resistor.

[0013] The beneficial effects of this utility model are:

[0014] The auxiliary power supply circuit for power module half-bus power extraction provided by this utility model can reduce the input voltage, select lower power MOSFETs, reduce the size of the flyback transformer, improve the conversion efficiency of the switching power supply, and reduce the heat generation of the device. It solves the shortcomings of conventional power extraction power supplies such as high input voltage, complex structure, high price, and low efficiency. At the same time, the presence of voltage equalization resistors ensures that the voltage difference between the positive and negative buses is controlled within a small range during power-on, preventing abnormal shutdowns caused by uneven voltage between the positive and negative buses. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the auxiliary power supply circuit for the power module half-busbar power draw of this utility model.

[0016] In the diagram, 1. Inverter module, 2. Positive bus capacitor, 3. Negative bus capacitor, 4. Equalizing resistor, 5. Switching power supply, 6. DC-DC converter module, 7. DC source, 8. AC source. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1As shown, the system includes an inverter module 1, one end of which is connected to an AC source 8. The other end of the inverter module 1 is connected to a DC-DC converter module 6 via a DC bus unit, which in turn connects to a DC source 7. The DC bus unit is connected along the direction from the inverter module 1 to the DC source 7, including a positive bus capacitor 2, a bus capacitor 3, and a voltage equalization resistor 4. The DC bus unit includes a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module 1 is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are all connected to the DC-DC converter module 6. A positive bus capacitor 2 is connected between the BUS+ DC bus and the BUSN DC bus. A negative bus capacitor 3 is connected between the BUSN DC bus and the BUS- DC bus. A voltage equalization resistor 4 is also connected between the BUS+ DC bus and the BUSN DC bus, and the voltage equalization resistor 4 is located between the positive bus capacitor 2 and the DC-DC converter module 6.

[0019] It also includes a switching power supply 5, one end of which is connected to the BUSN DC bus and the other end is connected to the BUS- DC bus. The switching power supply 5 has an input voltage of 100V~750V, an output DC voltage of 15V, and an output power of 50W.

[0020] The inverter module 1 has a rated input voltage of AC650V~900V and an output voltage of DC900V~1300V.

[0021] Among them, the DC-DC converter module 6 adopts a Buck-Boost topology, with an input voltage of DC900V~1300V and an output voltage of DC100V~1500V.

[0022] Among them, the equalizing resistor 4 is selected as a 500KΩ power resistor.

[0023] The working principle of the auxiliary power supply circuit for the power module half-busbar power intake of this utility model is as follows:

[0024] First, AC power is input from AC source 8 and rectified into DC through the H-bridge topology inside inverter module 1. Positive bus capacitor 2 and negative bus capacitor 3 function to store energy and filter the DC output from inverter module 1. The bus capacitor is generally selected as 1.5mF, and the voltage equalization resistor 4 is selected as a 500kΩ power resistor, mainly to balance the voltage of the bus capacitor. Switching power supply 5 is connected in parallel on the negative bus. Switching power supply 5 adopts a flyback converter topology to provide switching power for the entire circuit. DC-DC converter module 6 adopts a Buck-Boost topology to convert the voltage on the DC bus into the required DC voltage for output. Its input voltage is DC900V~1300V and its output voltage is DC100V~1500V. It is connected to DC source 7 for power exchange. The overall power of the module is 50kW.

[0025] Example 1

[0026] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1 As shown, it includes an inverter module 1, one end of which is connected to an AC source 8, and the other end of the inverter module 1 is connected to a DC conversion module 6 and a DC source 7 via a DC bus unit. The DC bus unit is connected to a positive bus capacitor 2, a bus capacitor 3 and an equalizing resistor 4 along the direction from the inverter module 1 to the DC source 7.

[0027] Example 2

[0028] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1 As shown, the system includes an inverter module 1, one end of which is connected to an AC source 8. The other end of the inverter module 1 is connected to a DC-DC converter module 6 and a DC source 7 via a DC bus unit. The DC bus unit is connected to a positive bus capacitor 2, a bus capacitor 3, and a voltage equalization resistor 4 along the direction from the inverter module 1 to the DC source 7. The DC bus unit includes a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module 1 is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are all connected to the DC-DC converter module 6. A positive bus capacitor 2 is connected between the BUS+ DC bus and the BUSN DC bus, and a negative bus capacitor 3 is connected between the BUSN DC bus and the BUS- DC bus.

[0029] Example 3

[0030] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1 As shown, the system includes an inverter module 1, one end of which is connected to an AC source 8. The other end of the inverter module 1 is connected to a DC-DC converter module 6 via a DC bus unit, which in turn connects to a DC source 7. The DC bus unit is connected along the direction from the inverter module 1 to the DC source 7, including a positive bus capacitor 2, a bus capacitor 3, and a voltage equalization resistor 4. The DC bus unit includes a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module 1 is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are all connected to the DC-DC converter module 6. A positive bus capacitor 2 is connected between the BUS+ DC bus and the BUSN DC bus. A negative bus capacitor 3 is connected between the BUSN DC bus and the BUS- DC bus. A voltage equalization resistor 4 is also connected between the BUS+ DC bus and the BUSN DC bus, and the voltage equalization resistor 4 is located between the positive bus capacitor 2 and the DC-DC converter module 6.

[0031] Example 4

[0032] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1 As shown, the system includes an inverter module 1, with one end connected to an AC source 8. The other end of the inverter module 1 is connected to a DC-DC converter module 6 via a DC bus unit, which in turn connects to a DC source 7. The DC bus unit, along the direction from the inverter module 1 to the DC source 7, includes a positive bus capacitor 2, a bus capacitor 3, and a voltage equalization resistor 4. The DC bus unit comprises a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module 1 is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are connected to each other. The busbars are all connected to the DC-DC converter module 6. A positive bus capacitor 2 is connected between the BUS+ DC bus and the BUSN DC bus. A negative bus capacitor 3 is connected between the BUSN DC bus and the BUS- DC bus. A voltage equalizing resistor 4 is also connected between the BUS+ DC bus and the BUSN DC bus. The voltage equalizing resistor 4 is located between the positive bus capacitor 2 and the DC-DC converter module 6. The system also includes a switching power supply 5. One end of the switching power supply 5 is connected to the BUSN DC bus, and the other end is connected to the BUS- DC bus. The input voltage of the switching power supply 5 is 100V~750V, the output DC voltage is 15V, and the output power is 50W.

[0033] Example 5

[0034] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1 As shown, the system includes an inverter module 1, with one end connected to an AC source 8. The other end of the inverter module 1 is connected to a DC-DC converter module 6 via a DC bus unit, which in turn connects to a DC source 7. The DC bus unit, along the direction from the inverter module 1 to the DC source 7, includes a positive bus capacitor 2, a bus capacitor 3, and a voltage equalization resistor 4. The DC bus unit comprises a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module 1 is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are connected to each other. The busbars are all connected to the DC-DC converter module 6. A positive bus capacitor 2 is connected between the BUS+ DC bus and the BUSN DC bus. A negative bus capacitor 3 is connected between the BUSN DC bus and the BUS- DC bus. A voltage equalizing resistor 4 is also connected between the BUS+ DC bus and the BUSN DC bus. The voltage equalizing resistor 4 is located between the positive bus capacitor 2 and the DC-DC converter module 6. The system also includes a switching power supply 5. One end of the switching power supply 5 is connected to the BUSN DC bus, and the other end is connected to the BUS- DC bus. The input voltage of the switching power supply 5 is 100V~750V, the output DC voltage is 15V, and the output power is 50W.

[0035] The inverter module 1 has a rated input voltage of AC650V~900V and an output voltage of DC900V~1300V.

[0036] Example 6

[0037] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1 As shown, the system includes an inverter module 1, with one end connected to an AC source 8. The other end of the inverter module 1 is connected to a DC-DC converter module 6 via a DC bus unit, which in turn connects to a DC source 7. The DC bus unit, along the direction from the inverter module 1 to the DC source 7, includes a positive bus capacitor 2, a bus capacitor 3, and a voltage equalization resistor 4. The DC bus unit comprises a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module 1 is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are connected to each other. The busbars are all connected to the DC-DC converter module 6. A positive bus capacitor 2 is connected between the BUS+ DC bus and the BUSN DC bus. A negative bus capacitor 3 is connected between the BUSN DC bus and the BUS- DC bus. A voltage equalizing resistor 4 is also connected between the BUS+ DC bus and the BUSN DC bus. The voltage equalizing resistor 4 is located between the positive bus capacitor 2 and the DC-DC converter module 6. The system also includes a switching power supply 5. One end of the switching power supply 5 is connected to the BUSN DC bus, and the other end is connected to the BUS- DC bus. The input voltage of the switching power supply 5 is 100V~750V, the output DC voltage is 15V, and the output power is 50W.

[0038] The inverter module 1 has a rated input voltage of AC650V~900V and an output voltage of DC900V~1300V. The DC-DC converter module 6 adopts a Buck-Boost topology with an input voltage of DC900V~1300V and an output voltage of DC100V~1500V.

[0039] Example 7

[0040] This utility model provides an auxiliary power supply circuit for power module half-bus power extraction, such as... Figure 1As shown, the system includes an inverter module 1, with one end connected to an AC source 8. The other end of the inverter module 1 is connected to a DC-DC converter module 6 via a DC bus unit, which in turn connects to a DC source 7. The DC bus unit, along the direction from the inverter module 1 to the DC source 7, includes a positive bus capacitor 2, a bus capacitor 3, and a voltage equalization resistor 4. The DC bus unit comprises a BUS+ DC bus, a BUSN DC bus, and a BUS- DC bus. One end of the inverter module 1 is connected to the BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus. The BUS+ DC bus, the BUSN DC bus, and the BUS- DC bus are connected to each other. The busbars are all connected to the DC-DC converter module 6. A positive bus capacitor 2 is connected between the BUS+ DC bus and the BUSN DC bus. A negative bus capacitor 3 is connected between the BUSN DC bus and the BUS- DC bus. A voltage equalizing resistor 4 is also connected between the BUS+ DC bus and the BUSN DC bus. The voltage equalizing resistor 4 is located between the positive bus capacitor 2 and the DC-DC converter module 6. The system also includes a switching power supply 5. One end of the switching power supply 5 is connected to the BUSN DC bus, and the other end is connected to the BUS- DC bus. The input voltage of the switching power supply 5 is 100V~750V, the output DC voltage is 15V, and the output power is 50W.

[0041] The inverter module 1 has a rated input voltage of AC650V~900V and an output voltage of DC900V~1300V. The DC-DC converter module 6 adopts a Buck-Boost topology with an input voltage of DC900V~1300V and an output voltage of DC100V~1500V. The voltage equalization resistor 4 is a 500KΩ power resistor.

[0042] The auxiliary power supply circuit for power module half-bus provided by this utility model connects the switching power supply 5 only to the positive half-bus. At the same time, in order to solve the problem of uneven voltage between the positive and negative buses during power-up, an appropriate resistor is connected in parallel on the negative half-bus. This allows the input voltage of the switching power supply to be 100V~750V. Lowering the input voltage allows for the selection of lower power MOSFETs, reduces the size of the flyback transformer, improves the conversion efficiency of the switching power supply, and reduces the heat generation of the devices.

Claims

1. A power module half bus power supply circuit, characterized in that, The application relates to an inverter module (1) connected with an AC power source (8) at one end and connected with a DC power source (7) through a DC bus unit and a DC conversion module (6) in sequence at the other end, wherein the DC bus unit is connected with a positive bus capacitor (2), a bus capacitor (3) and a voltage-sharing resistor (4) in sequence from the inverter module (1) to the DC power source (7).

2. The power module half bus power take-off auxiliary power supply circuit of claim 1, wherein, The DC bus unit comprises a BUS+ DC bus, a BUSN DC bus and a BUS- DC bus, the inverter module (1) is connected with the BUS+ DC bus, the BUSN DC bus and the BUS- DC bus at one end, the BUS+ DC bus, the BUSN DC bus and the BUS- DC bus are connected with the DC conversion module (6) in common, the positive bus capacitor (2) is connected between the BUS+ DC bus and the BUSN DC bus, and the negative bus capacitor (3) is connected between the BUSN DC bus and the BUS- DC bus.

3. The power module half bus power take-off auxiliary power supply circuit of claim 2, wherein, The voltage-sharing resistor (4) is further connected between the BUS+ DC bus and the BUSN DC bus and is located between the positive bus capacitor (2) and the DC conversion module (6).

4. The power module half bus power take-off auxiliary power supply circuit of claim 1, wherein, The application further comprises a switching power source (5) connected with the BUSN DC bus at one end and connected with the BUS- DC bus at the other end.

5. The power module half bus power take-off auxiliary power supply circuit of claim 4, wherein, The switching power source (5) has an input voltage of 100V-750V and an output DC voltage of 15V and an output power of 50W.

6. The power module half bus power take-off auxiliary power supply circuit of claim 1, wherein, The inverter module (1) has a rated input voltage of AC 650V-900V and an output voltage of DC 900V-1300V.

7. The power module half bus power take-off auxiliary power supply circuit of claim 1, wherein, The DC conversion module (6) adopts a Buck-Boost topology structure, has an input voltage of DC 900V-1300V and an output voltage of DC 100V-1500V.

8. The power module half bus power take-off auxiliary power supply circuit of claim 1, wherein, The voltage-sharing resistor (4) is a 500K Omega power resistor.

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