US 5,396,107 AGranted

Power source system

AssigneeHitachi, Ltd.

InventorJunichi Shoji

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Abstract

A power source system failing to become operable when only a primary A.C. power source is turned on, and made operable by turning on not only the primary A.C. power source but also a secondary power source is disclosed, in which initial-state-of-secondary-source setting means is previously set so that the initial state of the secondary power source at a time when the primary A.C. power source is turned on, is a desired one of an ON-state and an OFF-state, a system control part reads out the state of the initial-state-of-secondary-source setting means immediately after the primary A.C. power source has been turned on, and an ON-OFF control is performed for an ON/OFF switching circuit in accordance with the read-out state, to make the initial state of the secondary power source equal to the desired state. Thus, in a case where a controlled apparatus is required to become operable as soon as the primary A.C. power source is turned on, the initial-state-of-secondary-source setting means is set so that the initial state of the ON/OFF switching circuit is an ON-state, to make the controlled apparatus usable immediately without operating any operation switch, thereby improving the usability of the controlled apparatus.

Claims3

Dependent claims

A power source system comprising:

a firm-output power circuit for outputting a stabilized voltage continually to components located on a secondary side when an A.C. voltage is applied to a primary side;
an ON/OFF switching circuit for controlling an application of a voltage to a controlled apparatus in response to a source control signal, said controlled apparatus comprising a circuit having a main function which is not turned on when the A.C. voltage is applied to the primary side;
a first non-lock type operation switch for designating a change of state of the ON/OFF switching circuit;
a system control part operated by the stabilized output voltage of the firm-output power circuit for selecting an operating state by delivering the source control signal to the ON/OFF switching circuit in response to each operation output of the first non-lock type operation switch to change the operating state of the ON/OFF switching circuit from an OFF-state, to an ON-state, or from the ON-state to the OFF-state to control the application of the voltage to the controllable apparatus;
and
initial-state-of-secondary-source setting means for instructing the system control part to set an initial state of the ON/OFF switching circuit, when the A.C. voltage is applied to the primary side of the firm-output power circuit, the initial-state-of-secondary-source setting means setting the initial state, independent of the previous operating state, to a desired one of the ON-state and the OFF-state.

3 more elements

A power source system comprising:

a firm-output power circuit for outputting a stabilized voltage continually to components located on a secondary side when an A.C. voltage is applied to a primary side;
an ON/OFF switching circuit for controlling an application of a voltage to a controlled apparatus in response to a source control signal, said controlled apparatus comprising a circuit having a main function which is not turned on when the A.C. voltage is applied to the primary side;
a first non-lock type operation switch for designating a change of state of the ON/OFF switching circuit;
a system control part operated by the stabilized output voltage of the firm-output power circuit for selecting an operating state by delivering the source control signal to the ON/OFF switching circuit in response to each operation output of the first non-lock type operation switch to change the operating state of the ON/OFF switching circuit from an OFF-state, to an ON-state, or from the ON-state to the OFF-state to control the application of the voltage to the controllable apparatus;
and
initial-state-of-secondary-source setting means for instructing the system control part to set a desired initial state of the ON/OFF switching circuit, when the A.C. voltage is applied to the primary side of the firm-output power circuit, the initial-state-of-secondary-source setting means setting the desired initial state, independent of the previous operating state, to a selected one of the ON-state and the OFF-state, the initial-state-of-secondary-source setting means further comprises:
an electrically erasable programmable read only memory (EEPROM) for storing the desired initial state of the ON/OFF switching circuit;
an EEPROM initializing switch for selectively setting the desired initial state stored in the electrically erasable programmable read only memory to the OFF-state;
and
a second operation switch for setting said desired initial state stored in the electrically erasable programmable read only memory.

7 more elements

Dependencies are inferred from the claim text.