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Home Electrical and Wave Single-transformer-switching-regulator

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Details
Inventors: Muto, Takanori; Sudou, Teruhisa;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Dougherty; Thomas M.
Assistant Examiner: Nguyen; Matthew V.
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen

A switching regulator comprises a single transformer having a primary winding connected in an input circuit for receiving direct-current energy and a secondary winding connected in an output circuit, and a switching transistor connected in series with the primary winding. A high frequency pulse generator triggers the switching transistor so that it interrupts the direct-current energy at a high frequency. A rectifier is provided for converting high frequency energy developed in the secondary winding into direct-current output energy, which is maintained constant by controlling the high frequency pulse generator. A low voltage detector produces a signal when the direct-current energy in the input circuit falls below a specified value. In response to the signal from the low voltage detector, constant direct-current energy is derived from a battery and applied to the output circuit as backup power.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a switching regulator which is efficient, light-weight and low cost.
According to the present invention, there is provided a switching regulator having an input circuit and an output circuit.
The switching regulator comprises a single transformer having a primary winding connected in the input circuit for receiving direct-current energy and a secondary winding connected in the output circuit, and a switching element connected in series with the primary winding.
A monitor circuit is connected to the output circuit for monitoring the direct-current energy in the output circuit.
A high frequency pulse generator, energized by the direct-current energy in the input circuit, generates a high frequency pulse with a duty ratio inversely variable as a function the monitored direct-current energy in the output circuit.
The switching element is responsive to the high frequency pulse for interrupting the direct-current energy supplied to the primary winding of the transformer.
A rectifier circuit is connected in the output circuit for converting high frequency energy developed in the secondary winding into direct-current energy.
A low voltage detector is provided for producing a low voltage indication signal when the direct-current energy in the input circuit falls below a specified value.
In response to the low voltage indication signal, constant direct-current energy is derived from a battery and supplied to the output circuit as backup power.
According to a first specific aspect of the present invention, the constant direct-current energy is derived by a circuit comprising a second switching element connected in series with the battery across the secondary winding, and a second high frequency pulse generator energized by the direct-current energy in the output circuit for generating a high frequency pulse with a duty ratio inversely variable as a function of the direct-current energy in the output circuit detected by the monitor circuit


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