Claims
- 1. A switching power source, comprising:
- a DC voltage source;
- a first switch element connected to said DC voltage source;
- low-pass filter means having an output end for connection to a load and an input end selectively connectable to said DC voltage source through said first switch element;
- a second switch element connected in parallel relative to the input end of said low-pass filter means, said first and second switch elements each comprising a MOS-FET having parasitic capacitors and being turned on and off so that an output signal of desired frequency is produced at the output end of said low-pass filer means;
- a reactor connected in parallel with said second switch element for charging and discharging said parasitic capacitors during a switching operation hen said first switch element is switched off and said seconds witch element is switched on, and vice versa, said reactor including a saturable core for giving a non-linear property to said reactor; and
- a capacitor connected in series with said reactor so that the series connection of said reactor and said capacitor is in parallel with said second switch element, wherein said first and second switch elements are directly connected together at a common connection point, and the series connection of said reactor and said capacitor is connected directly to said common connection point.
- 2. A switching power source as defined in claim 1, wherein said first switch element has an electrode connected to a positive plea of said DC voltage source and said second switch element has an electrode connected to a negative pole of said DC voltage source.
- 3. A switching power source as claimed in claim 1, wherein said saturable core provided in said reactor is provided with an additional winding through which a load current flows for applying a bias current in response to the load current on said saturable core.
- 4. A switching power source as claimed in claim 1 wherein the output regulation of said switching power source is accomplished by pulse-width modulation.
- 5. A switching power source, comprising:
- a DC voltage source;
- a first switch element connected to said DC voltage source;
- low-pass filter means having an output end for connection to a load and an input end selectively connectable to said DC voltage source through said first switch element;
- a second switch element connected in parallel relative to the input end of said low-pass filter means, said first and second switch elements each comprising a MOS-FET having parasitic capacitors and being turned on and off so that an output signal of desired frequency is produced at the output end of said low-pass filter means;
- a reactor connected in parallel with said second switch element for charging and discharging said parasitic capacitors during a switching operation when said first switch element is switched off and said seconds witch element is switched on, and vice versa, said reactor including a saturable core for giving a non-linear property to said reactor; and
- a transformer connected between said first switch element and said low-pass filer means.
- 6. A switching power source as defined in claim 5, wherein said transformer has a primary circuit and a secondary circuit, said DC voltage source and said first switch element being connected in said primary circuit, and said second switch element and said reactor being connected in said secondary circuit.
- 7. A switching power source as defined in claim 5, and further comprising: a third switch element connected in series with both said second switch element and said reactor, said third switch element being controlled to turn on and off substantially simultaneously with said first switch element, and said third switch element and said transformer having parasitic capacitors which are charged and discharged by said reactor.
- 8. A switching power source as defined in claim 5, and further comprising: a capacitor connected in series with said reactor so that the series connection of said reactor and said capacitor is in parallel with said second switch element; wherein said transformer has a primary circuit and a secondary circuit, and said DC voltage source, first and second switch elements and series connection of said capacitor and reactor are all connected in said primary circuit, and said secondary circuit includes diode means for rectifying the output signal to produce a DC output.
- 9. A switching power source as defined in claim 5, and further comprising: a first capacitor connected in series with said reactor so that the series connection of said reactor and said first capacitor is in parallel with said second switch element; and wherein said first and second switch elements having a common connection point and further comprising a second capacitor connected between said common connection point and said transformer.
- 10. A switching power source as defined in claim 5, wherein said transformer has a primary circuit including a primary winding and said first and second switch elements having a common connection point connected at one end of said primary winding, and further comprising third and fourth switch elements having a common connection point connected at the other end of said primary winding and a second reactor, having a saturable core for giving a non-linear property to said second reactor, connected to said common connection point so as to be n parallel with said fourth switch element, said third switch element being connected to said DC voltage source, wherein said third and fourth switch elements and said second reactor operate similarly to said first and second switch elements and said reactor, respectively, to produce a full bridge inverter circuit.
- 11. A switching power source as defined in claim 10, and further comprising a first capacitor connected in series with said reactor so that the series connection of said first capacitor and said reactor is in parallel with said second switch; and a second capacitor connected in series with said second reactor, the series connection of said second capacitor and said second reactor being in parallel with said fourth switch element.
- 12. A switching power source as claimed in claim 10, wherein said saturable core provided in said reactor is provided with an additional winding through which a load current flows for applying a bias current in response to the load current on said saturable core.
- 13. A switching power source as claimed in claim 10, wherein the output regulation of said switching power source is accomplished by pulse-width modulation.
- 14. A switching power source, comprising:
- a DC voltage source;
- a first switch element connected to said DC voltage source;
- low-pass filter means having an output end for connection to a load and an input end selectively connectable to said DC voltage source through said first switch element;
- a second switch element connected in parallel relative to the input end of said low-pass filter means, said first and second switch elements having parasitic capacitors and being turned on and off so that an output signal of desired frequency is produced at the output end of said low-pass filter means;
- a reactor connected in parallel with said second switch element for charging and discharging said parasitic capacitors during a switching operation when said first switch element is switched off and said second switch element is switched on, and vice versa; and
- a capacitor connected in series with said reactor so that the series connection of said reactor and said capacitor is in parallel with said second switch element, wherein said first and second switch elements have a common connection point, and the series connection of said reactor and said capacitor is connected to said common connection point, wherein the output regulation of said switching power source is accomplished by pulse-width modulation.
Priority Claims (2)
Number |
Date |
Country |
Kind |
63-230133 |
Sep 1988 |
JPX |
|
1-234577 |
Sep 1989 |
JPX |
|
Parent Case Info
CROSS-REFERENCE TO RELATED APPLICATION
This application is a Continuation-in-part of copending U.S. Pat. application Ser. No. 07/323,381 filed Mar. 14, 1989.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
52-32525 |
Nov 1977 |
JPX |
56-35679 |
Apr 1981 |
JPX |
Continuation in Parts (1)
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Number |
Date |
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Parent |
323381 |
Mar 1989 |
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