Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses
AssigneeRohm Co., Ltd.
InventorsKenichi Fukumoto, Yousuke Aoyagi
Life of this patent
Estimating the term…
Abstract
A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a load is fed back and PWM control of each of the semiconductor switches is performed. Also, snubber circuits are respectively connected between a ground and the center tap of the primary winding, and an abnormal high voltage at the time of switching is reduced. Also, a parallel running of plural inverters is simply performed by disposing PWM comparators corresponding to the first and second semiconductor switches.
Claims11
(canceled)
A controller IC for controlling a semiconductor switch for driving a load, the controller comprising:
- an oscillator block for generating a first triangular wave signal and a second triangular wave signal, said second triangular wave signal being reversed relative to the first triangular wave signal;
- a current detection signal input terminal to which a current detection signal is inputted, said current detection signal being based on a current flowing through the load;
- a PWM control signal generation circuit for generating a PWM control signal for switching the semiconductor switch based on the first triangular wave signal, the second triangular wave signal, and an error signal, said error signal being generated based on the current detection signal;
- a burst signal generation circuit for generating a burst signal in which a first state and a second state are repeated;
- and
- a burst control circuit coupled to the burst signal generation circuit inside the controller IC, wherein the burst control circuit halts a switching operation of the semiconductor switch when the burst signal is in the first state.
An AC-DC converter comprising:
- a transformer having a primary winding with a center tap and at least one secondary winding, the center tap being coupled to a first potential point of a DC power source;
- a first semiconductor switch coupled between one end of the primary winding and a second potential point of the DC power source;
- a second semiconductor switch coupled between the other end of the primary winding and the second potential point;
- a current detection circuit for detecting a current flowing through a load coupled to the secondary winding;
- an oscillator block for generating a first triangular wave signal and a second triangular wave signal, said second triangular wave signal being reversed relative to the first triangular wave signal;
- a current detection signal input terminal to which a current detection signal is inputted, said current detection signal being based on a current flowing through the load;
- a PWM control signal generation circuit for generating a PWM control signal for switching the semiconductor switch based on the first triangular wave signal, the second triangular wave signal, and an error signal, said error signal being generated based on the current detection signal;
- a burst signal generation circuit for generating a burst signal in which a first state and a second state are repeated;
- and
- a burst control circuit coupled to the burst signal generation circuit inside the controller IC, wherein the burst control circuit halts a switching operation of the semiconductor switch when the burst signal is in the first state.
Dependencies are inferred from the claim text.