Power supplying circuit and method
AssigneeSony Corporation
InventorHideaki Shiobara
Life of this patent
Estimating the term…
Abstract
Only the standby transformer supplies a current to a control power source while the operation power is off, and supplies a current to a primary power relay when the primary power relay is activated. After activation of the primary power relay, both of the standby transformer and a main transformer supply currents to the control power source and the primary power relay. This makes it possible to reduce the rated current of the standby transformer as well as the standby power.
Claims9
A power supplying circuit comprising;
- a source of input power;
- a primary power relay for opening and closing an input circuit of a main transformer in circuit with said source of input power;
- a standby transformer in circuit with said source of input power for supplying standby power, the standby transformer having a smaller current capacity than a rated drive current capacity of the primary power relay:
- and
- power supply control means for causing the primary power relay to turn on the main transformer when supplying standby power, and for causing a supply of power from an output of the main transformer to the primary power relay after turning-on of the main transformer.
A power supplying method comprising the steps of:
- turning on a primary power relay that opens and closes an input circuit of a main transformer, by using an output of the standby transformer;
- and
- supplying power to the primary power relay from an output of the main transformer after turning-on of the main transformer.
A power supplying circuit for selectively supplying operation power and continuously supplying standby power to selected circuits, comprising:
- a source of input power;
- a standby transformer having its input in circuit with said source of input power and its output in circuit with a rectifying circuit for supplying standby power to a control power source;
- a main transformer having its input in circuit with said source of input power only when supplying main power, an output of the main transformer being in circuit with a rectifying circuit for supplying main power to said control power source, said main transformer being in parallel with said standby transformer;
- a primary power relay in circuit with the input of said main transformer for interrupting said supply of power to said main transformer when in a standby condition, said standby transformer having a smaller current capacity than a rated drive current capacity of the primary power relay;
- and
- a drive circuit for driving the primary power relay in accordance with a signal that is supplied from a control circuit that includes said control power source and that operates on power that is supplied from the standby transformer;
- and
- a switch for switching an output from which to supply power to the primary power relay from an output of the standby transformer to outputs of both of the standby transformer and the main transformer.
Dependencies are inferred from the claim text.