Uninterruptible power supply input power walk-in
AssigneeExide Electronics Corporation
InventorFrederick Tassitino, Jr.
Life of this patent
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Abstract
An UPS system provides a true input power walk-in. The UPS adjusts the level of power supplied from an input port to a load on an output port as a function of a level of current of a power supplied from a backup power source to the load on the output port.
Claims19
An input power walk-in method for an uninterruptible power supply ("UPS") having an input port for receiving power, a backup power source, and an output port for providing power to a load, the method comprising the steps of:
- (a) determining a level of current of power supplied from the backup power source to the load on the output port;
- and
- (b) controlling a level of power supplied to the load on the output port from the input port as a function of the level of current of the power supplied from the backup power source to the load on the output port so that the level of the power supplied to the load on the output port from the input port is gradually increased over a predetermined interval of time while maintaining the total level of power supplied to the load on the output port substantially constant.
An input power walk-in circuit for an uninterruptible power supply ("UPS") having an input port for receiving power, a backup power source, and an output port for providing power to a load, the circuit comprising:
- current determination means for determining a level of current of power supplied from the backup power source to the load on the output port;
- and
- power controller means for controlling a level of power supplied to the load on the output port from the input port as a function of the level of current of the power supplied from the backup power source to the load on the output port so that the level of the power supplied to the load on the output port from the input port is gradually increased over a predetermined interval of time while maintaining the total level of power supplied to the load on the output port substantially constant.
An input power walk-in method for an uninterruptible power supply ("UPS") having an input port for receiving power, a backup power source, and an output port for providing power to a load, the method comprising the steps of:
- (a) determining a level of current of power supplied from the backup power source to the load on the output port, including the steps of:
- (i) employing a current sensor to generate a current signal whose voltage level is representative of the level of current of the power supplied from the backup power source to the load on the output port, and
- (ii) employing a voltage divider circuit to linearly reduce the voltage level of the current signal generated by the current transformer to a level which is within an operating range of a controller;
- and
- (b) employing the controller to control a level of power supplied to the load on the output port from the input port as a function of the determined level of current of power supplied from the backup power source to the load on the output port so that the level of the power supplied to the load on the output port from the input port is gradually increased over a predetermined interval of time, including the steps of:
- (i) comparing the determined level of current of power supplied from the backup power source to the load on the output port to a desired level of current,
- (ii) increasing a level of power supplied to the load on the output port from the input port if the determined level of current of power supplied from the backup power source to the load on the output port is greater than the desired level of current, and
- (iii) decreasing a level of power supplied to the load on the output port from the input port if the determined level of current of power supplied from the backup power source to the load on the output port is less than the desired level of current.
An input power walk-in circuit for an uninterruptible power supply ("UPS") having an input port for receiving power, a backup power source, and an output port for providing power to a load, the circuit comprising:
- current determination means for determining a level of current of power supplied from the backup power source to the load on the output port, including:
- means including a current sensor for generating a current signal whose voltage level is representative of the level of current of the power supplied from the backup power source to the load on the output port, and
- linear reduction means including a voltage divider circuit for linearly reducing the voltage level of the current signal generated by the current transformer;
- and
- means for controlling a level of power supplied to the load on the output port from the input port as a function of the determined level of current of power supplied from the backup power source to the load on the output port so that the level of the power supplied to the load on the output port from the input port is gradually increased over a predetermined interval of time, including:
- means for comparing the determined level of current of power supplied from the backup power source to the load on the output port to a desired level of current,
- means for increasing a level of power supplied to the load on the output port from the input port if the determined level of current of power supplied from the backup power source to the load on the output port is greater than the desired level of current, and
- means for decreasing a level of power supplied to the load on the output port from the input port if the determined level of current of power supplied from the backup power source to the load on the output port is less than the desired level of current.
Dependencies are inferred from the claim text.