| 摘要 |
A power conversion device includes a full-bridge switch circuit, a converter circuit, and a control circuit. The full-bridge switch circuit is operable to convert a direct current input voltage to a converted voltage. The converter circuit converts the converted voltage into a direct current output voltage. The converter circuit includes a resonant inductor, a transformer, a first converter switch, a second converter switch, an output inductor, and an output capacitor. The direct current output voltage is provided across the output capacitor. The control circuit controls the full-bridge switch circuit, the first converter switch and the second converter switch based on the direct current output voltage and a reference voltage. |
| 主权项 |
1. A power conversion device comprising:
a full-bridge switch circuit disposed to receive a first control signal, a second control signal, a third control signal, a fourth control signal, and a direct current input voltage, the full-bridge switch circuit being operable to convert the direct current input voltage to a converted voltage VAB having a waveform that approximates a square wave, wherein each of the first, second, third, and fourth control signals electrically coupled with a parasitic capacitance, respectively; a converter circuit electrically coupled with the full-bridge switch circuit for receiving the converted voltage and for converting the converted voltage into a direct current output voltage, the converter circuit including:
a resonant inductor having a first terminal electrically coupled with the full-bridge switch circuit and a second terminal;a transformer having a primary winding and a secondary winding, the primary winding having a first terminal electrically coupled with the second terminal of the resonant inductor, and a second terminal electrically coupled with the full-bridge switch circuit, the secondary winding having a first terminal, a second terminal, and a center tap positioned between the first terminal and the second terminal of the secondary winding;a first converter switch having a first terminal electrically coupled to the second terminal of the secondary winding, a second terminal, and a third terminal disposed to receive a fifth control signal that controls the first converter switch to switch between an on state and an off state;a second converter switch having a first terminal electrically coupled to the first terminal of the secondary winding, a second terminal electrically coupled with the second terminal of the first converter switch, and a third terminal disposed to receive a sixth control signal that controls the second converter switch to switch between an on state and an off state; andan output inductor electrically coupled in series between the center tap of the secondary winding, and distinct from it, and an output capacitor, the output capacitor being disposed between the output inductor and the second terminal of the second converter switch, the direct current output voltage being provided across the output capacitor; and a control circuit electrically coupled with the full-bridge switch circuit and the converter circuit and disposed to receive the direct current output voltage and a reference voltage, the control circuit generating the first control signal, the second control signal, the third control signal, the fourth control signal for controlling the full-bridge switch circuit based on the direct current output voltage and the reference voltage, and generating the fifth control signal and the sixth control signal for controlling the first converter switch and the second converter switch based on the direct current output voltage and the reference voltage;
wherein, while the first converter switch is in an on state, the control circuit is configured to control the second converter switch to switch to an on state before magnitude of the converted voltage becomes zero. |
