CPC H03K 17/56 (2013.01) | 5 Claims |
1. A voltage isolation circuit, electrically connected between a first power supply and a second power supply, comprising:
a first transistor electrically connected to a negative terminal of the first power supply and a positive terminal of the second power supply;
a second transistor electrically connected to a positive terminal of the first power supply and a positive terminal of the second power supply;
a third transistor electrically connected to the negative terminal of the first power supply and the negative terminal of the second power supply;
a first high impedance element, electrically connected to the first transistor in parallel, having a measurement terminal;
a first end, connected to the positive terminal of the first power supply;
a second end, connected to the negative terminal of the second power supply, wherein the first end and the second end are electrically connected to a load device;
a switch unit, selectively conducted the first end and the second end to first power supply and the second power supply; and
a reverse connection detection loop, wherein when the first power supply and the second power supply are operated in a measurement mode, the reverse connection detection loop is used to determine whether the load device is reversely connected, and when the load device is reversely connected, the switch unit does not conduct the first end and the second end to the first power supply and the second power supply;
wherein impedance values measured from the negative terminal of the first power supply to the measurement terminal and measured from the measurement terminal to the positive terminal of the second power supply are the same;
wherein the first transistor is controlled by a first control signal, when the first transistor is conducted, the first power supply and the second power supply are electrically connected in series in a first current loop;
wherein the second transistor and the third transistor are controlled by a second control signal, when the second transistor and the third transistor are conducted, the first power supply and the second power supply are electrically connected in parallel in a second current loop.
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