Output device and power source system
An output device outputs a DC voltage applied between a first terminal and a second terminal via the drain and the source of a semiconductor switch. The output device includes a conversion circuit configured to convert the DC voltage into a voltage of a predetermined polarity, irrespective of the polarity of the DC voltage. A booster circuit boosts the voltage that was converted by the conversion circuit and applies the boosted voltage to the gate of the semiconductor switch. The semiconductor switch is on if the voltage of the control terminal with respect to the potential of the first terminal is at least a predetermined voltage.
1. An output device configured to output a DC voltage, which is applied between two terminals of a battery, via a first terminal and a second terminal of a semiconductor switch, the output device comprising:
a conversion circuit configured to convert the DC voltage from the battery into a voltage of a predetermined polarity, irrespective of a polarity of the DC voltage;
a booster circuit configured to boost the voltage converted by the conversion circuit and apply the boosted voltage to a control terminal of the semiconductor switch and
wherein the conversion circuit is interposed between the battery and the booster circuit, so as to be interposed between a first terminal of the battery and the booster circuit and a second terminal of the battery and the booster circuit,
wherein the semiconductor switch is on if the voltage at the control terminal with respect to a potential of the first terminal is at least a predetermined voltage, so as to protect the semiconductor switch in the event of a reverse polarity connection.
2. The output device according to claim 1 , wherein the booster circuit is configured to start boosting if the DC voltage is applied between the two terminals.
3. A power source system, comprising:
the output device according to claim 1 ; and
a load to which the DC voltage output by the output device is applied.
4. The power source system according to claim 3 , further comprising:
a fuse element that is configured to melt if a current flows there through that is at least a predetermined current,
wherein the DC voltage is applied to the load via the semiconductor switch and the fuse element.
5. The power source system as set forth in claim 3 , wherein the booster circuit is configured to start boosting if the DC voltage is applied between the two terminals.
6. The power source system according to claim 5 , further comprising:
a fuse element that is configured to melt if a current flows there through that is at least a predetermined current,
wherein the DC voltage is applied to the load via the semiconductor switch and the fuse element.
7. The power source system according to claim 5 , further comprising:
a fuse element that is configured to melt if a current flows there through that is at least a predetermined current,
wherein the DC voltage is applied to the load via the semiconductor switch and the fuse element and wherein the booster circuit is configured to start boosting if the DC voltage is applied between the two terminals.
8. The output device according to claim 1 , wherein the conversion circuit includes a first diode, a second diode, a third diode and a fourth diode each having an anode and a cathode, wherein the anode of the first diode and the cathode of the second diode are connected to the second terminal of the semiconductor switch, and the anode of the third diode and the cathode of the fourth diode are connected to the first terminal of the semiconductor switch, and wherein the cathode of the first diode and the cathode of the third diode are connected to a first connection node interposed between the first diode and the third diode, and the anode of the second diode and the anode of the fourth diode are connected to a second connection node interposed between the second diode and the fourth diode, and a first conductive line connects the booster circuit to the first connection node and a second conductive line connects the booster circuit to the second connection node.
9. The power source system according to claim 3 , wherein the conversion circuit includes a first diode, a second diode, a third diode and a fourth diode each having an anode and a cathode, wherein the anode of the first diode and the cathode of the second diode are connected to the second terminal of the semiconductor switch, and the anode of the third diode and the cathode of the fourth diode are connected to the first terminal of the semiconductor switch, and wherein the cathode of the first diode and the cathode of the third diode are connected to a first connection node interposed between the first diode and the third diode, and the anode of the second diode and the anode of the fourth diode are connected to a second connection node interposed between the second diode and the fourth diode, and a first conductive line connects the booster circuit to the first connection node and a second conductive line connects the booster circuit to the second connection node.