Switch-mode DC power supply, monolithic IC and hybrid IC for the same
First Claim
1. A switch-mode dc power supply comprising:
- (a) a series circuit comprising a primary winding of a HF transformer, a semiconductor switching element and a current detection unit connected between two output terminals of a rectifier/smoothing circuit;
(b) a rectifier, connected to a end of a secondary winding of said HF transformer;
(c) an output smoothing circuit connected between said rectifier and other end of said HF transformer;
(d) a detection circuit connected to a connection point between said rectifier and said output smoothing circuit;
(e) an adding circuit connected between said detection circuit and a connection point between said semiconductor switching element and said current detection unit;
(f) a triangular wave generator connected to said adding circuit; and
(g) a control signal generator connected between said adding circuit and a control electrode of said semiconductor switching element, and further connected to said triangular wave generator.
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Accused Products
Abstract
The switch-mode dc power supply includes a series circuit, a rectifier, an output smoothing circuit, detection circuit, an adding circuit, a triangular wave generator and a control signal generator. The series circuit includes a primary winding of a HF transformer, a semiconductor switching element and a current detection unit connected between two output terminals of a rectifier/smoothing circuit. The rectifier is connected to an end of a secondary winding of the HF transformer. The output smoothing circuit is connected between the rectifier and other end of the secondary winding. The detection circuit is connected to a connection point between the rectifier and the output smoothing circuit. The adding circuit is connected between the detection circuit and a connection point between the semiconductor switching element and the current detection unit. The adding circuit has a current mirror and a current detector. The triangular wave generator is connected to the adding circuit. And the control signal generator is connected between the adding circuit and a control electrode of the semiconductor switching element, and further is connected to the triangular wave generator. The adding circuit adds a voltage corresponding to a dc output signal at the secondary winding to a voltage corresponding to a current flowing in the semiconductor switching element so as to obtain an augmented voltage signal. The gate electrode is supplied with a drive signal keeping the "H" level until the augmented voltage signal reaches the triangular wave signal. Then, the power supply operates with good stability.
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Citations
20 Claims
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1. A switch-mode dc power supply comprising:
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(a) a series circuit comprising a primary winding of a HF transformer, a semiconductor switching element and a current detection unit connected between two output terminals of a rectifier/smoothing circuit; (b) a rectifier, connected to a end of a secondary winding of said HF transformer; (c) an output smoothing circuit connected between said rectifier and other end of said HF transformer; (d) a detection circuit connected to a connection point between said rectifier and said output smoothing circuit; (e) an adding circuit connected between said detection circuit and a connection point between said semiconductor switching element and said current detection unit; (f) a triangular wave generator connected to said adding circuit; and (g) a control signal generator connected between said adding circuit and a control electrode of said semiconductor switching element, and further connected to said triangular wave generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A monolithic integrated circuit for a switch-mode dc power supply, the integrated circuit comprising:
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(a) a semiconductor chip; (b) first, second and third input terminals, each comprising a thin metallic film, disposed at periphery of the semiconductor chip; (c) first and second output terminals, each comprising the thin metallic film, disposed at periphery of the semiconductor chip; (d) a regulator merged in a surface of the semiconductor chip, the regulator connected to the first input terminal; (e) an adding circuit merged in the surface of the semiconductor chip, the adding circuit connected to the regulator, the second and third input terminals; (f) a triangular wave generator merged in the surface of the semiconductor chip, the triangular wave generator connected to said adding circuit; and (g) a control signal generator connected between the adding circuit and the first output terminal, and further connected to said triangular wave generator. - View Dependent Claims (12, 13)
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14. A hybrid integrated circuit for a switch-mode dc power supply, the integrated circuit comprising:
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(a) a conductive base substrate; (b) an insulating plate disposed on a part of the conductive base substrate; (c) a first semiconductor chip disposed on another part of the conductive base substrate, the first semiconductor chip merging a semiconductor switching element; and (d) a second semiconductor chip disposed on the insulating plate, the second semiconductor chip having an integrated circuit comprising; a regulator merged in a surface of the second semiconductor chip; an adding circuit merged in the surface of the second semiconductor chip, the adding circuit connected to the regulator; a triangular wave generator merged in the surface of the second semiconductor chip, the triangular wave generator connected to said adding circuit; and a control signal generator connected to the adding circuit and to said triangular wave generator. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification