DIRECT-CURRENT UNINTERRUPTIBLE POWER SUPPLY SYSTEM AND DEVICE

摘要

A DC uninterruptible power supply system includes plural uninterruptible power supply devices, each of which includes a power cord, a battery module, a voltage detecting circuit, a current detecting circuit, and a control unit. When the voltage detecting circuit detects that a voltage at the power cord is lower than a first preset value, the control unit controls the battery module to output electrical power to the power cord. When the current detecting circuit detects that current of another uninterruptible power supply device is smaller than a second preset value, the control unit controls a switch to permit current flow to the another uninterruptible power supply device.

主权项

1. A direct-current (DC) uninterruptible power supply system, comprising a plurality of uninterruptible power supply devices, each of which is disposed to receive input from a DC power source for supply of electrical power to a load, and includes:
a power cord to be coupled between the load and the DC power source for transmitting a first current from the DC power source to the load; a battery module coupled to said power cord for receiving and storing electrical power from the DC power source; a voltage detecting circuit coupled to said power cord and configured to generate a first trigger signal upon detecting that a voltage of the DC power source is lower than a first preset value; a current detecting circuit coupled to said power cord of another one of said uninterruptible power supply devices, and configured to generate a second trigger signal upon detecting that the first current flowing in said power cord of said another one of said uninterruptible power supply devices is smaller than a second preset value; a switch coupled between said power cord and said current detecting circuit, and configured to make or break electrical connection between said power cord and said current detecting circuit; and a control unit coupled to said battery module, said voltage detecting circuit, said current detecting circuit and said switch, and configured to control said battery module to output electrical power to said power cord according to the first trigger signal, and to control said switch to make electrical connection between said power cord and said current detecting circuit according to the second trigger signal.