DC power supply device with constant power output level
First Claim
1. A power supply device for supplying an output voltage from smoothing circuits to a load, comprising:
- a first primary winding and a second primary winding, and a first secondary winding and a second secondary winding magnetically coupled respectively to said first and second primary windings;
a first current supply circuit and a second current supply circuit for respectively supplying electric currents to said first and second primary windings and inducing alternating voltages in said first and second secondary windings by making said electric current flow to said first and second primary windings;
a rectifying circuit for rectifying the respective alternating voltages induced in said first and second secondary windings and being connected to said first and second secondary windings respectively at their ends; and
a smoothing circuit for smoothing the voltage output from said rectifying circuit, other ends of said first and second secondary windings being short circuited, said first and second current supply circuits controlling phases of alternating currents supplied to said first and second primary windings respectively.
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Accused Products
Abstract
A DC power supply device includes transformers that operate with an enhanced efficiency and can reduce the factors that generate ripples in the output voltage to make it possible to downsize the transformers and the smoothing filters of the device, reduce the loss attributable to the switching elements during its constant power output operation and also downsize the heat sink fins so that the overall dimensions of the power supply device may be reduced. The DC power supply device also comprises a pair of switching changers, two output transformers and two rectifying/smoothing sections for rectifying the respective outputs of the switching changers. Each of the two switching changers has the same switching cycle period and the striking phases of the switching elements of one of the switching changers and those of the switching elements of the other switching changer are made variable. Then, a constant power output level is achieved by utilizing the difference of the striking phases of the two switching changers in order to isolate the switching changers from each other for operation and connect them in series or in parallel for operation.
135 Citations
22 Claims
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1. A power supply device for supplying an output voltage from smoothing circuits to a load, comprising:
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a first primary winding and a second primary winding, and a first secondary winding and a second secondary winding magnetically coupled respectively to said first and second primary windings;
a first current supply circuit and a second current supply circuit for respectively supplying electric currents to said first and second primary windings and inducing alternating voltages in said first and second secondary windings by making said electric current flow to said first and second primary windings;
a rectifying circuit for rectifying the respective alternating voltages induced in said first and second secondary windings and being connected to said first and second secondary windings respectively at their ends; and
a smoothing circuit for smoothing the voltage output from said rectifying circuit, other ends of said first and second secondary windings being short circuited, said first and second current supply circuits controlling phases of alternating currents supplied to said first and second primary windings respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power supply device for supplying an output voltage from smoothing circuits to a load, comprising:
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a first primary winding and a second primary winding, and a first secondary winding and a second secondary winding magnetically coupled respectively to said first and second primary windings;
a first current supply circuit and a second current supply circuit for respectively supplying a forwardly flowing electric current and a backwardly flowing electric current to said first and second primary windings and inducing voltages in said first and second secondary windings;
a rectifying circuit for rectifying the respective voltages induced in said first and second secondary windings; and
a smoothing circuit for smoothing the voltage output from said rectifying circuit;
said rectifying circuit having a first series connected circuit, a second series connected circuit, and a third series connected circuit, each being formed by connecting two rectifying elements in series at a connection point, said first through third series connected circuits being short circuited respectively at anode sides and cathode sides and connected to said smoothing circuit;
said first and second secondary windings being connected respectively at their ends thereof to connection middle points of said first and second series connected circuits;
said first and second secondary windings being connected respectively to other ends thereof to a connection middle point of said third series connected circuits. - View Dependent Claims (12, 13, 14, 15, 16, 17, 22)
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18. A power supply device supplying an output voltage from smoothing circuits to a load, comprising:
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a first primary winding and a second primary winding, and a first secondary winding and a second secondary winding magnetically coupled respectively to said first and second primary windings;
a first current supply circuit and a second current supply circuit for respectively and intermittently supplying electric currents to said first and second primary windings and inducing voltages in said first and second secondary windings;
a rectifying circuit for rectifying respective voltages induced in said first and second primary windings; and
a smoothing circuit for smoothing the voltage output from said rectifying circuit, the smoothing circuit being connected to a first common connection point and a second common connection point included in said rectifying circuit, said rectifying circuit having a first rectifying element, a second rectifying element, and a third rectifying element, said first and second secondary windings being connected respectively at their ends thereof to a first common connection point by way of said first and second rectifying elements;
said first and second secondary windings being connected respectively to other ends thereof to a second common connection point, said second common connection point being connected to said first common connection point by way of said third rectifying element. - View Dependent Claims (19, 20, 21)
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Specification