DC-to-DC voltage-increasing power source

Details DC-to-DC voltage-increasing power source DC-to-DC voltage-increasing power source

1989-03-24

1990-03-13

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 61, 363 63, 363 49, 323908, H02M 3335

Patent

active

049087525

ABSTRACT:
A DC-to-DC voltage-increasing power source suitable for use in an audio device mounted on an automobile or a portable type audio device includes a DC power source, a drive pulse generation circuit for generating drive pulses which are in 180 degree phase relationship, a switching circuit of a push-pull connection supplied with operating voltage from the DC power source and driven between an on-state and an off-state in response to the drive pulses, a charge and discharge circuit including capacitors charged by being connected in parallel to the DC power source and discharging a sum voltage by being connected in series to the DC power source and an output takeout circuit for taking out this sum voltage as a voltage-increasing DC output. The switching circuit is constructed of voltage-controlled type elements whose on-state is changed in response to the level of an on-pulse in the drive pulses and the drive pulse generation circuit includes a pulse level changing circuit for changing the level of the on-pulse. in one aspect of the invention, the switching circuit includes a variable time constant circuit for transmitting an on-pulse with a relatively large time constant and an off-pulse with a relatively small time constant.

REFERENCES:
patent: 3986085 (1976-10-01), Weber
patent: 4092712 (1978-05-01), Harrigill, Jr. et al.
patent: 4259600 (1981-03-01), Fellrath et al.
patent: 4298926 (1981-11-01), Black

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