Zero-voltage-transition (ZVT) 3-phase PWM voltage link converters
First Claim
1. A zero-voltage-transition three-phase voltage link converter, comprising:
- a direct current power source;
a main switching circuit connected between said direct current power source and a three-phase alternating current output; and
an auxiliary circuit connected between said direct current power source and said main switching circuit, said auxiliary circuit comprising;
at least one resonant inductor connected to at least one phase of said three-phase output;
auxiliary power supply means for discharging said resonant inductor; and
switch means for switchably connecting said auxiliary circuit to said direct current power source.
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Accused Products
Abstract
An improved zero voltage transition (ZVT) pulse width modulation (PWM) link converter is provided which introduces a space vector modulation scheme and an auxiliary circuit which includes a commutation power supply or special switch arrangement used to discharge resonant inductor currents to zero and to recover commutation energy. In an alternate embodiment, an improved ZVT PWM link converter provides an auxiliary switch for each main switch in the converter to achieve ZVT. The novel ZVT converters provide zero-voltage switching without increasing switching action of the main switches. In this way, the advantages of PWM control is maintained. Conduction loss, turn-off losses, and voltage stress of the main switches are the same as in conventional PWM converters, but the dominant turn-on losses are eliminated, so total power losses are minimized.
69 Citations
7 Claims
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1. A zero-voltage-transition three-phase voltage link converter, comprising:
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a direct current power source; a main switching circuit connected between said direct current power source and a three-phase alternating current output; and an auxiliary circuit connected between said direct current power source and said main switching circuit, said auxiliary circuit comprising; at least one resonant inductor connected to at least one phase of said three-phase output; auxiliary power supply means for discharging said resonant inductor; and switch means for switchably connecting said auxiliary circuit to said direct current power source. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A zero-voltage-transition three-phase voltage link converter, comprising:
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a direct current power source; a main switching circuit having three pairs of power switches connected in parallel with said direct current power source, each of said pairs of power switches corresponding to one phase of a three-phase alternating current output; an auxiliary circuit for achieving zero voltage transition in said main switching circuit, said auxiliary circuit comprising; three pairs of auxiliary switches connected in parallel with said direct current power source, each of said pairs of auxiliary switches corresponding to one phase of said three-phase alternating current output, and each of said pairs of auxiliary switches connected to a corresponding one of said pairs of power switches with a resonant inductor.
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Specification