Power supply circuit with auxiliary constant voltage circuit inhibit feature
First Claim
1. A power supply circuit comprising:
- a first power supply line continuously supplied with power;
a second power supply line supplied with power when a power supply switch is closed;
a primary constant voltage circuit connected to the second power supply line for supplying power to a third power supply line at a preset constant primary voltage;
an auxiliary constant voltage circuit connected to the first power supply line for supplying power to the third power supply line at a constant auxiliary voltage set lower than the primary voltage; and
a halt control circuit for halting operation of the auxiliary constant voltage circuit when the power supplied to the second power supply line is interrupted for a period equal to or longer than a preset allowable time.
1 Assignment
0 Petitions
Accused Products
Abstract
A compact power supply circuit which can supply power to various apparatuses and circuits with a high degree of stability. A primary constant voltage circuit is connected to a second power supply line, which is supplied with power from a battery only when a relay is closed. The circuit supplies power to a third power supply line at a constant primary voltage. An auxiliary constant voltage circuit is connected to a first power supply line, which is always supplied with power from the battery for supplying power to the third power supply line at a constant auxiliary voltage lower than the primary voltage. A halt control circuit enables the operation of the auxiliary constant voltage circuit if power is supplied to the second power supply line and disables the operation of the auxiliary constant voltage circuit if the supply of power is interrupted for a period equal to or longer than a predetermined allowable time. The supply of power to the third power supply line is continued by the auxiliary constant voltage circuit if the temporary interruption of the supply of power to the second power supply line is within the allowable time.
13 Citations
30 Claims
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1. A power supply circuit comprising:
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a first power supply line continuously supplied with power; a second power supply line supplied with power when a power supply switch is closed; a primary constant voltage circuit connected to the second power supply line for supplying power to a third power supply line at a preset constant primary voltage; an auxiliary constant voltage circuit connected to the first power supply line for supplying power to the third power supply line at a constant auxiliary voltage set lower than the primary voltage; and a halt control circuit for halting operation of the auxiliary constant voltage circuit when the power supplied to the second power supply line is interrupted for a period equal to or longer than a preset allowable time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17, 18)
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11. A power supply circuit for an electronic controller comprising:
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a first power supply line constantly supplied with power; a second power supply line supplied with power when a power supply switch associated with the second power supply line is closed; a control line over which a power supply command is input to instruct whether power is to be supplied by the second power supply line; and a switch controller for controlling opening and closing of the power source switch in accordance with the power supply command from the control line; a primary constant voltage circuit connected to the second power supply line for supplying power to a third power supply line at a preset constant primary voltage; an auxiliary constant voltage circuit connected to the first power supply line for supplying power to the third power supply line at a constant auxiliary voltage set lower than the primary voltage; and a halt controller for halting operation of the auxiliary constant voltage circuit only while the power supply command indicates the supply of power has been halted for at least a preset allowable time. - View Dependent Claims (12, 13, 19)
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14. A power supply circuit comprising:
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a primary constant voltage circuit, connected to a selectively operated power source, for supplying power to a power supply line at a preset constant primary voltage; an auxiliary constant voltage circuit, connected to a continuous power source, for supplying power to the power supply line at a constant auxiliary voltage set lower than the primary voltage; and a halt control circuit for halting operation of the auxiliary constant voltage circuit when the selectively operated power source is interrupted for a period longer than the preset allowable time, the halt control device including an auxiliary constant voltage circuit enabling device that enables the auxiliary constant voltage circuit when the selectively enabled power source is enabled, and a charge storage device that stores a predetermined charge when the selectively enabled power source is enabled, and that maintains operation of the auxiliary constant voltage circuit enabling device for the preset allowable time when operation of the selectively enabled power source is interrupted. - View Dependent Claims (15, 16)
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20. A power supply circuit comprising:
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a first supply line continuously supplied with power; a second power supply line supplied with power when a power supply switch is closed; a first constant voltage circuit connected to the second power supply line for supplying power to a third power supply line at a preset constant primary voltage; a second constant voltage circuit connected to the first power supply line for supplying power to the third power supply line at a constant auxiliary voltage set to be different than the primary voltage; and a halt control circuit for halting operation of the first and second constant voltage circuits when the power supplied to the second power supply line is interrupted for a period equal to or longer than a preset allowable time. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification