Patent ID: 8130524

Claim:
A bi-directional DC to DC power converter comprising: a first DC power circuit consisting of a first DC source, a first inductor, a first switch and a first capacitor being connected sequentially, wherein the first DC source has a positive terminal and a negative terminal; the first inductor has two terminals respectively connected to the positive terminal of the first DC source and the first switch; and the first switch is controlled to selectively turn on or off, has a first end and a second end and is further connected reversely with a first diode in parallel; a second DC power circuit consisting of a second DC source, a second inductor, a second switch and a second capacitor being connected sequentially, wherein the second DC source has a positive terminal and a negative terminal; the second inductor has two terminals respectively connected to the negative terminal of the second DC source and the second switch; and the second switch is controlled to selectively turn on or off, has a first end and a second end and is further connected reversely with a second diode in parallel; and a third switch having two ends with a first end directly connected to the first end of the first switch at which the first inductor and the first switch are connected together, and a second end directly connected to the first end of the second switch at which the second inductor and the second switch are connected together, the third switch being controlled to selectively turn on or off and further connected reversely with a third diode in parallel; wherein the negative terminal of the first DC source is connected to the positive terminal of the second DC source at a first node, the first capacitor and the second capacitor are connected at a second node, and the first node and the second node are connected together to form a neutral terminal.