Emergency power supply专利检索-施密特触发器电子零件及设备专利检索查询-专利查询网

Emergency power supply

阅读：77发布：2022-01-20

专利汇可以提供Emergency power supply专利检索，专利查询，专利分析的服务。并且The disclosed embodiment of the present invention is an auxiliary power supply which generally includes a battery, a relay for connecting the battery to an output in the absence of line voltage, and a circuit for charging the battery. The charging circuit includes a circuit for providing a relatively low charge rate to the battery and another circuit for providing a relatively high charge rate to the battery. A Schmitt trigger circuit is responsive to the voltage level of the battery for activating and deactivating the low charge rate circuit. A gate compares the voltage level of the battery with a reference voltage level to control the high charge rate circuit. Once the high charge circuit has been rendered inoperative during a particular period between line voltage failures, it remains inoperative. An interrogator circuit periodically draws a relatively small energy current pulse from the battery, thereby placing it under a load condition while the Schmitt trigger is sensing the voltage level of the battery. If, by virtue of the load condition, the voltage level of the battery drops below one of the trigger levels of the Schmitt circuit, the trigger circuit will activate the low charge circuit to charge the battery.，下面是Emergency power supply专利的具体信息内容。

权利要求

1. In an auxiliary power supply for connecting a battery to an output in the absence of line voltage, a circuit for charging the battery comprising a. a source of charging voltage, b. means for connecting said source to the battery, c. means for sensing the voltage level of the battery and energizing said connecting means in response thereto, and d. means for loading the battery for a relatively short time duration during the presence of said line voltage, whereby said sensing means is operative to sense the voltage level of the battery under a loaded condition.

2. A circuit for charging the battery in an auxiliary power supply as defined in claim 1, further comprising means for periodically energizing said loading means.

3. A circuit for charging the battery in an auxiliary power supply as defined in claim 1, wherein said loading means includes means for drawing a pulse of current from the battery.

4. A circuit for charging the battery in an auxiliary power supply as defined in claim 3, wherein said loading means further includes a switching element connecting said current drawing means across said battery.

5. A circuit for charging the battery in an auxiliary power supply as defined in claim 4, further comprising means for periodically energizing said switching element.

6. A circuit for charging the battery in an auxiliary power supply as defined in claim 5, wherein said current drawing means includes a resistor and capacitor connected in series with one another and with said switching element.

7. A circuit for charging the battery in an auxiliary power supply as defined in claim 5, wherein said energizing means includes an oscillator.

8. A circuit for charging the battery in an auxiliary power supply as defined in claim 1, wherein said sensing means includes a trigger circuit responsive to one voltage level for switching from a first output state to a second output state and responsive to another voltage level for switching from the second to the first output state, means responsive to one output state of said trigger circuit for connecting said charging source across the battery and responsive to the other output state of said trigger circuit for disconnecting said charging source from the battery.

9. A circuit for charging the battery in an auxiliary power supply as defined in claim 8, wherein said loading means includes means for drawing a current pulse from the battery and means for periodically energizing said current drawing means.

10. A circuit for charging the battery in an auxiliary power supply as defined in claim 9, wherein said current drawing means includes a first resistor and a capacitor connected in series with one another, a second resistor connected in parallel with said capacitor, and a switching element connecting the series connected first resistor and capacitor across the battery, and wherein said energizing means includes means for producing a pulse output having a predetermined period for periodically energizing said switching element, the time constant of said second resistor and said caPacitor being less than the period of said pulse output and being greater than the time constant of said first resistor and said capacitor.

11. A circuit for charging the battery in an auxiliary power supply as defined in claim 1, wherein said connecting means includes a high charge rate circuit for connecting said source of charging voltage to the battery.

12. A circuit for charging the battery in an auxiliary power supply as defined in claim 11, further comprising means connected to said high charge rate circuit for comparing the voltage level of the battery with a reference voltage and for controlling said high rate circuit in accordance therewith.

13. A circuit for charging the battery in an auxiliary power supply as defined in claim 12, further comprising means for disabling said high charge rate circuit after the voltage of the battery attains a predetermined value.

14. A circuit for charging the battery in an auxiliary power supply as defined in claim 1, wherein said connecting means includes a first impedance element connectable between said source and the battery, and a high charge rate circuit including a second impedance element connectable between said source and the battery and having a value of impedance less than the impedance value of said first impedance element, said high charge rate circuit including a switching element connecting said second impedance element between said source and the battery in one state thereof, said means for sensing the voltage level of the battery providing a control signal when voltage of the battery is less than a predetermined value, said switching element being responsive to said control signal for changing to said one state thereof.

15. A circuit for charging the battery in an auxiliary power supply as defined in claim 14, further comprising memory means connecting said control signal to said switching element, said memory means including means for disabling said high charge circuit after the voltage of the battery attains a certain value higher than said predetermined value.

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Emergency power supply

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