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AssigneeHitachi, Ltd.
InventorsHiroyuki Shoji, Akihiko Kanouda, Ryuichi Saito, Seigou Yukutake, Katsuhiro Higuchi
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The DC-DC converter connects a first and a second switching circuit for converting power mutually between direct current and alternating current respectively to a first DC power source and a second DC power source and has a transformer between the AC terminals thereof. Here, between the AC terminals of the second switching circuit and the negative pole terminal of the DC power source, a voltage clamp circuit composed of a series unit of switching devices with a reverse parallel diode and a clamp condenser is connected. An isolated bidirectional DC-DC converter which prevents a reduction in a circulating current at time of buck and an occurrence of a surge voltage at time of voltage boost and realizes highly efficiency, low noise, and miniaturization is provided.
An isolated bidirectional DC-DC converter comprising a first DC power source, a first switching circuit connected between said first DC power source and a primary winding of a transformer for converting power mutually between direct current and alternating current, and a second switching circuit connected between a secondary winding of said transformer and a second DC power source for converting power mutually between direct current and alternating current, for transferring power between said first and second DC power sources at different voltages, wherein between an AC terminal of said second switching circuit and one terminal of said second DC power source, a voltage clamp circuit including a series unit of a switching device with a reverse parallel diode and a capacitor is connected.
An isolated bidirectional DC-DC converter comprising a first DC power source, a first switching circuit connected between said first DC power source and a primary winding of a transformer for converting power mutually between direct current and alternating current, and a second switching circuit connected between a secondary winding of said transformer and a second DC power source for converting power mutually between direct current and alternating current, for transferring power between said first and second DC power sources at different voltages, wherein said second switching circuit is a current doubler synchronous rectifier circuit and has two voltage clamp circuits including a series unit of a switching device with a reverse parallel diode and a capacitor which are connected between both AC terminals of said current doubler synchronous rectifier circuit and one terminal of said second DC power source.
An isolated bidirectional DC-DC converter comprising a first DC power source, a first switching circuit connected between said first DC power source and a primary winding of a transformer for converting power mutually between direct current and alternating current, and a second switching circuit connected between a secondary winding of said transformer and a second DC power source for converting power mutually between direct current and alternating current, for transferring power between said first and second DC power sources at different voltages, wherein said secondary winding of said transformer has a center tap, and said second switching circuit has a main switching device forming a full-wave rectifying circuit connected to said center tap of said secondary winding and both ends of said secondary winding via a reactor, and between said center tap and one terminal of said second DC power source, a voltage clamp circuit including a series unit of a switching device with a reverse parallel diode and a capacitor is connected.
Dependencies are inferred from the claim text.