A remote power supply leakage protection circuit
A technology of leakage protection and remote power supply, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as complex circuits, malfunctions, and insufficient timeliness, and achieve simple maintenance and flexibility Improve the effect of rapid leakage protection function
Active Publication Date: 2018-12-18
SHENZHEN VMAX NEW ENERGY CO LTD
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Problems solved by technology
[0003] At present, the leakage protection in the remote power supply mostly uses the sampling resistor to collect the voltage signal formed by the current, which is used as the input of the subsequent circuit such as the operational amplifier. This method makes the circuit very complicated and increases the probability of device failure risk.
Another problem is that the speed of protection is not flexible enough. Either it is too fast, which may easily cause misoperation in the case of interference such as surge, or it is not timely enough, which will affect the safety of leakage protection.
Method used
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[0015] The structure and principle of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0016] Such as figure 1 As shown, the remote power supply leakage protection circuit provided by the present invention includes a leakage detection unit, a leakage adjustment unit, a leakage feedback unit, a leakage control unit and a leakage protection unit.
[0017] When a leakage occurs, the leakage detection unit can capture the leakage signal at the output end of the remote power supply, and at the same time, the leakage protection unit protects the circuit of the remote power supply against the generated leakage signal to limit further increase of leakage current. The leakage adjustment unit receives the leakage signal detected by the leakage detection unit, controls the magnitude of the current supplied to the leakage feedback unit, thereby adjusting the sensitivity of the leakage signal, and outputs it to the leakage feedback un...
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The invention discloses a remote power supply earth leakage protection circuit, and the circuit comprises an electric leakage detection unit, an electric leakage regulating unit, an electric leakage feedback unit, an electric leakage control unit and an electric leakage protection unit. The electric leakage detection unit acquires an electric leakage signal of a remote power supply; the electric leakage regulating unit receives the electric leakage signal detected by the electric leakage detection unit, the sensitivity of the electric leakage signal is regulated, and the signal is outputted to the electric leakage feedback unit; the electric leakage feedback unit transmits the electric leakage signal to the electric leakage control unit; the electric leakage control unit analyzes if the electric leakage signal has phenomenon of surge or electric leakage, and the corresponding protection action is performed according to the analysis result; and the electric leakage protection unit protects the circuit of the remote power supply according to the generated electric leakage signal. The circuit has few electric components, and the judgment accuracy is improved by combining software, so that the safe operation of the remote power supply can be effectively ensured.
Description
technical field [0001] The invention relates to a power supply protection circuit, in particular to a leakage protection circuit of a remote power supply. Background technique [0002] The remote power supply is to convert the power supply of the central computer room from -48VDC to 208V / 380VDC output, and transmit it to the remote equipment through a special cable, and the remote equipment can use the inverter equipment to convert the DC power into a usable AC power or use the DC power supply to step down to -48V In order to realize remote power supply, as shown in the figure below, the DC remote power supply adopts floating power supply, that is, the voltage output is suspended from the ground, which also increases safety and improves lightning protection capabilities. The remote power supply adopts over-current and over-voltage technology. When the device output over-current or over-voltage is detected, the device will automatically turn off the output to improve the safe...
Claims
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IPC IPC(8): H02H3/32
CPCH02H3/32
Inventor 刘钧杨学锋
Owner SHENZHEN VMAX NEW ENERGY CO LTD