Rectifier-based surge protection circuit

A surge protected DC-DC power converter system comprising:

• a DC-DC converter;
• a bridge rectifier having two input terminals coupled to an input source of DC electricity that is normally DC voltage and DC current for the DC-DC converter that is subject to experience positively or negatively biased over-voltage and/or over-current under a surge condition, and two output terminals, a first output terminal of the two output terminals coupled to a voltage surge blocking stage via a first bus line and a second output terminal of the two output terminals coupled to a return bus;
• a current surge protection stage that is series coupled in the first bus line between the voltage surge blocking stage and a voltage surge detection stage that is coupled between the first bus line and the return bus;
• wherein the voltage surge blocking stage comprises a transistor having a drain terminal, a source terminal, a channel and a gate terminal, wherein the first bus line is coupled across the source terminal and the drain terminal through the channel of the transistor, and the gate terminal of the transistor is coupled to the voltage surge detection stage;
• a holdup capacitor coupled across the first bus line and the return bus, after the voltage surge detection stage;
• a bias converter coupled across the first bus line and the return bus, and comprising a positive bias output and a negative bias output, the positive bias output coupled to the voltage surge blocking stage, the positive bias output and the negative bias output coupled to the voltage surge detection stage;
• after the bias converter, the first output terminal of the two output terminals coupled to the first bus line and the second output terminal of the two output terminals coupled to the return bus and to inputs of the DC-DC converter.

A surge protection circuit comprising:

• a bridge rectifier having two input terminals coupled to an input source of DC electricity that is subject to experience negatively biased over-voltage and/or over-current, and two output terminals, a first output terminal of the two output terminals coupled to a voltage surge blocking stage via a first bus line and a second output terminal of the two output terminals coupled to a return bus;
• a current surge protection stage that is series coupled in the first bus line between the voltage surge blocking stage and a voltage surge detection stage that is coupled between the first bus line and the return bus;
• wherein the voltage surge blocking stage comprises a transistor having a drain terminal, a source terminal, a channel and a gate terminal, wherein the first bus line is coupled across the source terminal and the drain terminal through the channel of the transistor, and the gate terminal of the transistor is coupled to the voltage surge detection stage;
• the first output terminal of the two output terminals coupled to the first bus line and the second output terminal of the two output terminals coupled to the return bus, after the current surge protection stage.