A power supply device includes: a rectifier having a full-wave rectification circuit whose low side elements are made of MOSFETs; an electrical load supplied with DC power from the rectifier; and a control circuit having a load voltage detector and an AC voltage detector for detecting an input termi
A power supply device includes: a rectifier having a full-wave rectification circuit whose low side elements are made of MOSFETs; an electrical load supplied with DC power from the rectifier; and a control circuit having a load voltage detector and an AC voltage detector for detecting an input terminal voltage from a permanent-magnet generator; wherein when a terminal voltage across the electrical load is lower than a predetermined value, the control circuit operates the rectifier in full-wave rectification mode, whereas when the terminal voltage across the electrical load is higher than the predetermined value, the control circuit short-circuits input terminals of the permanent-magnet generator with each other, and when power for driving the control circuit is not secured, the control circuit retains the full-wave rectification mode even if the terminal voltage across the electrical load is higher than the predetermined value.
대표청구항▼
1. A power supply device, comprising: a permanent-magnet generator including a rotor having a magnet for forming a magnetic field and a stator having a stator winding;a rectifier including a full-wave rectification circuit, for rectifying an AC current generated by the permanent-magnet generator int
1. A power supply device, comprising: a permanent-magnet generator including a rotor having a magnet for forming a magnetic field and a stator having a stator winding;a rectifier including a full-wave rectification circuit, for rectifying an AC current generated by the permanent-magnet generator into a DC current, whose low side elements are made of MOSFETs;an electrical load supplied with DC power output from the rectifier; anda control circuit including a load voltage detector for detecting a terminal voltage across the electrical load and an AC voltage detector for detecting an input terminal voltage from the permanent-magnet generator; whereinwhen the terminal voltage across the electrical load is lower than a predetermined value, if the input terminal voltage from the permanent-magnet generator connected to each MOSFET is positive, the control circuit turns off the each MOSFET, whereas if the input terminal voltage negative, the control circuit turns on the each MOSFET, thereby supplying power to the electrical load (full-wave rectification mode); meanwhile, when the terminal voltage across the electrical load is higher than the predetermined value, the control circuit turns on the MOSFETs, thereby short-circuiting input terminals of the permanent-magnet generator with each other, furthermore, the control circuit includes a power supply unit supplied with power from the permanent-magnet generator for driving the control circuit, and when the power for driving the control circuit is not secured, the power supply unit retains the full-wave rectification mode even if the terminal voltage across the electrical load is higher than the predetermined value. 2. A power supply device according to claim 1, wherein when each MOSFET is turned on, the each MOSFET retains an ON state, and is turned off at a time when the input terminal voltage from the permanent-magnet generator connected to the each MOSFET changes from negative to positive. 3. A power supply device according to claim 1, wherein when each MOSFET is turned on, the each MOSFET retains an ON state, and is turned off at every time when the input terminal voltage from the permanent-magnet generator connected to the each MOSFET changes from negative to positive. 4. A power supply device, comprising: a permanent-magnet generator including a rotor having a magnet for forming a magnetic field and a stator having a stator winding;a rectifier including a full-wave rectification circuit, for rectifying an AC current generated in the permanent-magnet generator into a DC current, whose low side elements are made of MOSFETs;an electrical load supplied with DC power output from the rectifier; anda control circuit including a load voltage detector for detecting a terminal voltage across the electrical load and an AC voltage detector for detecting an input terminal voltage from the permanent-magnet generator; whereinwhen the terminal voltage across the electrical load is lower than a first predetermined value, if the input terminal voltage from the permanent-magnet generator connected to each MOSFET is positive, the control circuit turns off the each MOSFET, whereas if the input terminal voltage negative, the control circuit turns on the each MOSFET, thereby supplying power to the electrical load, furthermore, the control circuit includes a power supply unit supplied with power from the permanent-magnet generator for driving the control circuit, and when the terminal voltage across the electrical load is higher than the first predetermined value and the input terminal voltage from the permanent-magnet generator connected to each MOSFET is lower than the first predetermined value but higher than a voltage set to a second predetermined value that allows power enough for driving the control circuit to be secured, the power supply unit turns on the each MOSFET. 5. A power supply device according to claim 4, wherein when each MOSFET is turned on, the each MOSFET retains an ON state, and is turned off at a time when the input terminal voltage from the permanent-magnet generator connected to the each MOSFET changes from negative to positive. 6. A power supply device according to claim 4, wherein when each MOSFET is turned on, the each MOSFET retains an ON state, and is turned off at every time when the input terminal voltage from the permanent-magnet generator connected to the each MOSFET changes from negative to positive. 7. A power supply device according to claim 4, wherein when the input terminal voltage from the permanent-magnet generator connected to each MOSFET is the second predetermined value and the terminal voltage across the electrical load is higher than the first predetermined value, the each MOSFET is turned on, retains an ON state, and is turned off at every time when the input terminal voltage from the permanent-magnet generator connected to the each MOSFET changes from negative to positive. 8. A power supply device according to claim 4, further comprising: an electrical load terminal voltage comparator for determining whether or not the terminal voltage across the electrical load is higher than the first predetermined value (a first comparator);an AC input terminal predetermined voltage comparator for determining whether or not the input terminal voltage from the permanent-magnet generator is higher than the second predetermined value (a second comparator); andan AC input terminal negative voltage comparator for determining whether or not the input terminal voltage from the permanent-magnet generator is negative (a third comparator); whereinA flip-flop circuit is provided, a determination signal from the first comparator is applied to an input of an AND gate and a determination signal from the second comparator is applied via a differentiator to the other input of the AND gate, an output signal from the AND gate is applied to SET input of the flip-flop circuit and a determination signal from the third comparator is applied to RESET input of the flip-flop circuit, an output signal from the flip-flop circuit is applied to an input of an OR gate and the determination signal from the third comparator is applied to the other input of the OR gate, and an output signal from the OR gate is made a control signal for each MOSFET. 9. A power supply device according to claim 4, the permanent-magnet generator being a three-phase AC generator, the power supply device further comprising: an electrical load terminal voltage comparator for determining whether or not the terminal voltage across the electrical load is higher than the first predetermined value (a first comparator);an AC input terminal predetermined voltage comparator for determining whether or not an input terminal voltage at one of phases from the permanent-magnet generator is higher than the second predetermined value (a second comparator);an AC input terminal negative voltage comparator for determining whether or not the input terminal voltage from the permanent-magnet generator is negative (a third comparator); andan other-phase input terminal positive voltage comparator A and an other-phase input terminal positive voltage comparator B both for determining whether or not input voltages at the other two phases from the three-phase AC generator are positive; whereina flip-flop circuit is provided, a determination signal from the first comparator is applied to an input of an first AND gate and a determination signal from the second comparator is applied via a differentiator to the other input of the first AND gate, an output signal from the first AND gate is applied to SET input of the flip-flop circuit, a determination signal from the other-phase input terminal positive voltage comparator A is applied to an input of a second AND gate and a determination signal from the other-phase input terminal positive voltage comparator B is applied to the other input of the second AND gate, an output signal from the second AND gate is applied to RESET input of the flip-flop circuit, an output signal from the flip-flop circuit is applied to an input of an OR gate and an determination signal from the third comparator is applied to the other input of the OR gate, and an output signal from the OR gate is made a control signal for each MOSFET.
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이 특허에 인용된 특허 (1)
Chung Seung-Myun,KRX ; Kim Ho-Kyoung,KRX ; Whang Juhn-Sub,KRX ; Na Jae-Ho,KRX, Control system of auxiliary power system for a hybrid electric vehicle.
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