Patent ID: 7088595

Claim:
A reversible buck-boost chopper circuit connected between a DC power source and a load, the circuit comprising: a first half-bridge circuit with a first output terminal comprising: a first switching element having a high-side main electrode connected to a positive electrode of the DC power source; and a second switching element connected to the first switching element in series at the first output terminal, the second switching element having a low-side main electrode connected to a negative electrode of the DC power source; a second half-bridge circuit with a second output terminal comprising: a third switching element having a high-side main electrode connected to a high-side terminal of the load and having no connection to the high-side main electrode of the first switching element; and a fourth switching element connected to the third switching element in series at the second output terminal, the fourth switching element having a low-side main electrode connected to a low-side terminal of the load and the negative electrode of the DC power source; and a reactor connected between the first output terminal of the first half-bridge circuit and the second output terminal of the second half-bridge circuit.