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Module cascade high-voltage direct-current chopper

A high-voltage DC and chopper technology, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, and can solve problems such as complex control, high cost, and fixed ratio

Inactive Publication Date: 2020-05-01
HANGZHOU E ENERGY ELECTRIC POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Constrained by the withstand voltage level of a single fully-controlled power transistor and the inability to effectively balance the voltage drop of multiple direct-connected fully-controlled power transistors, for the voltage up-down conversion of high-voltage DC, multiple "H-bridge DC-AC conversion, The series-parallel combination of ferromagnetic double-winding transformer transformation and H-bridge AC-DC conversion can realize the up-down conversion of DC voltage
[0003] The existing high-voltage DC voltage up-down conversion device has the problems of fixed ratio, complicated control and high cost

Method used

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  • Module cascade high-voltage direct-current chopper

Examples

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Embodiment 1

[0035] This embodiment provides a module cascaded high-voltage DC BUCK (step-down) chopper, which is composed of a DC power supply, an input inductor, an output diode, an output inductor, an output capacitor, and a load resistor, between the DC input end and the DC output end There are multiple cascaded incomplete half-bridge modules between them.

[0036] Each incomplete half-bridge module includes a first switch and a second switch that conduct complementary conduction, the emitter of the first switch IGBT is connected to the collector of the second switch IGBT, the first switch IGBT is anti-parallel diode, and the second switch IGBT is not anti-parallel diode.

[0037] The anode of the DC input terminal is connected to the circuit between the first switch IGBT emitter of the first incomplete half-bridge module and the IGBT collector in the second switch, and the IGBT in the second switch of the last incomplete half-bridge module emits pole is connected to the positive pole...

Embodiment 2

[0052] This embodiment provides a module cascaded high-voltage DC BOOST (boost) chopper, which is composed of a DC power supply, an input inductor, an input diode, an output diode, an output inductor, an output capacitor, and a load resistor. There are multiple cascaded incomplete half-bridge modules between the terminals.

[0053] Each incomplete half-bridge module includes a first switch and a second switch that conduct complementary conduction, the emitter of the first switch IGBT is connected to the collector of the second switch IGBT, the first switch IGBT is anti-parallel diode, and the second switch IGBT is not anti-parallel diode.

[0054] The anode of the DC input terminal is connected to the circuit between the first switch IGBT emitter of the first incomplete half-bridge module and the IGBT collector in the second switch, and the IGBT in the second switch of the last incomplete half-bridge module emits The pole is connected to the negative pole of the DC output ter...

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Abstract

The invention discloses a module cascade high-voltage direct-current chopper. An existing high-voltage direct-current voltage lifting conversion device has the problems of being fixed in transformation ratio, complex in control and high in cost. Based on the existing BUCK and BOOST chopper circuits, series operation of a plurality of fully-controlled power transistors is achieved through module cascading, energy in a cascading module capacitor can be fed back to a circuit in a lossless mode (neglecting resistance of non-resistance elements in the circuit) by adding an input (or output) inductor, high-voltage direct current can be chopped like low-voltage direct current, and therefore control over voltage or current is achieved. In application to a BUCK chopper circuit, the inductance valueof the output inductor and the capacitance of the output capacitor can be reduced by improving the working frequency of the circuit under the condition that the input inductance is relatively small.In application to a BOOST chopper circuit, the inductance value of the input inductor and the capacitance of the output capacitor can be reduced by improving the working frequency of the circuit.

Description

technical field [0001] The invention relates to a high-voltage direct current voltage up-down conversion device, in particular to a module cascaded high-voltage direct current chopper. Background technique [0002] Low-voltage DC: DC with a voltage equal to or lower than 2kV. High-voltage direct current: a direct current whose voltage is higher than the long-term operating voltage (greater than 2kV) of a single transistor of the current mainstream fully-controlled power transistor (for example: Insulated Gate Bipolar Transistor, insulated gate bipolar transistor, referred to as IGBT). At present, the voltage up-down conversion of low-voltage DC can be completed by a BUCK (step-down) and BOOST (boost) chopper circuit composed of a single fully-controlled power transistor. Constrained by the withstand voltage level of a single fully-controlled power transistor and the inability to effectively balance the voltage drop of multiple direct-connected fully-controlled power transis...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 虞海泓
Owner HANGZHOU E ENERGY ELECTRIC POWER TECH