[introduction]Complete bridge circuit applies extensively at domain of electric power electron, wait for a domain like automation of switch power source, transducer, inverter, electric car, industry . In circuit, complete bridge circuit can make dc is changed into alternating current; In electric machinery control, complete bridge circuit can be used at frequency control and sine wave control.

One, introductive

Complete bridge circuit is defined

Complete bridge circuit is a kind of common electron circuit, by 4 switch canal and a laden composition, can be dc changeover alternating current.

The applied domain of complete bridge circuit

Complete bridge circuit applies extensively at domain of electric power electron, wait for a domain like automation of switch power source, transducer, inverter, electric car, industry. In circuit, complete bridge circuit can make dc is changed into alternating current; In electric machinery control, complete bridge circuit can be used at frequency control and sine wave control.

 

2, the principle of complete bridge circuit

Complete bridge circuit is connected through controlling what switch is in charge of will change the voltage polarity between power source and load, realize pair of laden drive. Going up inside half-period, switch is in charge of Q1, Q4 to close, q2, Q3 disconnects, the anode of power source enters load through Q1, laden negative pole returns the negative pole of power source through Q4. Inside next half-period, switch is in charge of Q2, Q3 to close, q1, Q4 disconnects, the anode of power source enters load through Q3, laden negative pole returns the negative pole of power source through Q2. Can realize direct current source to be changed to what communicate load so.

 

3, the demand that complete bridge circuit provides to MOS

(1) main loss forms: ① MOS is in charge of guide a loss is immediate by guide a Rdson decision, the Rdson that requirement MOS is in charge of is lower. The switch loss that ② MOS runs, the Miller that is in charge of by MOS makes the same score the parameter such as the stage to decide, character of switch of requirement MOS canal is good, switch rate is rapid, hand in more loss is small;

(2) back end is perceptual load, need diode is retrorse follow on current, it is better that diode of demand power MOS restores character reversely, have shorter restore time Trr reversely.

4, MOS of complete bridge circuit is in charge of type selecting

According to diverse applied demand, complete bridge circuit still can be divided wait for circuit of circuit of complete bridge inversion, complete bridge commutate, lucky dark semiconductor is multilayer and denotative series of MOS exceeding a written guarantee, in the application that applicable differs at complete bridge circuit.

Lucky dark semiconductor exceeds knot MOS whole set to use multilayer epitaxy technique, have low guide a loss, big shed voltage of charge of ability, low grid, low open, outstanding blame clamp the craft characteristic such as perceptual switch ability. Plus me department undertakes test of 100 percent avalanche energy puncture wait to have a level oneself to the product; Product to mark; of series of Ying Feiling C3, P6, P7 encloses a product to abound, provided huge flexibility for architects.

 

Complete bridge circuit attacks as a kind of common circuit develop structure, have good electricity / voltage controls capacity. Apply setting in the light of what complete bridge circuit differs, lucky dark semiconductor offers solution of integral power semiconductor.

 

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