Patent ID: 6960901
Filing Date: 2005-11-01
Classification: H02M

Abstract:
1. A bi-directional dc/dc power converter, comprising: a first dc voltage terminal set consisting of a positive terminal and a negative terminal; a second dc voltage terminal set consisting of a positive terminal, a negative terminal and a neutral terminal; an inductor acted as an energy buffer; a first power electronic device connected in series with an inductor, the combination of the first power electronic device and the inductor is connected between the positive terminal and the negative terminal of the first dc voltage terminal set, turning on/off the first power electronic device is used to perform the step-up power conversion; a second power electronic device connected between a connected point of the first power electronic device and the inductor, and the positive terminal of the second dc voltage terminal set, turning on/off the second power electronic device is used to perform the step-down power conversion; a first diode connected parallel with the first power electronic device; a second diode connected parallel with the second power electronic device; a capacitor connected between the two positive terminals of the first dc voltage terminal set and the second dc voltage terminal set; and a controller connected to two power electronic devices to turn on/off; wherein the bi-directional dc/dc power converter can carry out the bi-directional power flow; when a power flow direction is from the first dc voltage terminal set to the second dc voltage terminal set, the output voltage of the bi-directional dc/dc power converter is double of the voltage at the first dc voltage terminal set; and alternatively, when the power flow direction is in reverse from the second dc voltage terminal set to the first dc voltage terminal set, the output voltage of the bi-directional dc/dc power converter is half of a voltage at the second dc voltage terminal set.