Photovoltaic grid-connected inverter direct current reverse-connection prevention detection system
A detection system and inverter technology, which is applied in the direction of instruments, measuring electronics, and measuring devices, can solve problems such as high cost, reduced system safety features, and inability to safely isolate the main circuit from the control circuit, so as to increase safety and avoid damage effect
Inactive Publication Date: 2013-04-24
江苏宏宝电子有限公司
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Problems solved by technology
[0003] Using a voltage sensor for DC anti-reverse detection, the cost is too high, will reduce the competitive advantage of the enterprise; if the resistance divider is used to detect the DC side voltage, the cost will be reduced, but the main circuit and the control circuit will not be safely isolated, reducing the cost. System Security Features
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[0011] A further detailed description will be given below of a photovoltaic grid-connected inverter DC anti-reverse detection system of the present invention through specific embodiments.
[0012] Such as figure 1 As shown, a photovoltaic grid-connected inverter DC anti-reverse detection system includes an optocoupler and a diode; the diode is connected in series with the light-emitting diode on the primary side of the optocoupler in the same direction, and the negative pole of the diode is connected to the positive bus bar. The anode of the light-emitting diode on the primary side of the optocoupler is connected to the negative bus, and a resistor is connected in series between the diode and the positive bus or between the light-emitting diode and the negative bus; the collector of the secondary side of the optocoupler is connected to the control power supply, and the emitter passes through the The current circuit is connected to the 0V terminal of the control power supply, t...
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The invention discloses a photovoltaic grid-connected inverter direct current reverse-connection prevention detection system. The photovoltaic grid-connected inverter direct current reverse-connection prevention detection system comprises an optical-coupler and a diode. The diode is in series connection with a light-emitting diode on an original edge side of the optical-coupler, a negative pole of the diode is connected with a positive bus-bar, a positive pole of the light-emitting diode on the original edge side of the optical-coupler is connected with a negative bus-bar, and a resistor is in series connection between the diode and the positive bus-bar or between the light-emitting diode and the negative bus-bar. An optical-coupler auxiliary edge side collector is connected with a control power source, an emitter is connected with a 0V end of the control power source through a limited current circuit, and two ends of the light-emitting diode are reversely connected with a bypass diode in a parallel mode. The optical-coupler is used for isolating a main circuit and a control circuit, and therefore safety of the control circuit is improved. When a photovoltaic cell panel is normally connected, voltage of the optical-coupler auxiliary edge side emitter is in low level; and when the photovoltaic cell panel is reversely connected, the voltage of the optical-coupler auxiliary edge side emitter is in high level, and therefore a control system can accurately detect whether the cell panel is connected reversely and display corresponding faults, and damage on equipment or the photovoltaic cell panel because of misoperation of workers can be avoided.
Description
technical field [0001] The invention relates to a DC anti-reverse detection system for a photovoltaic grid-connected inverter. Background technique [0002] At present, the DC anti-reverse detection methods of photovoltaic grid-connected inverters generally use voltage sensors or resistor voltage dividers to detect the DC side voltage, but these methods have the following problems and shortcomings: [0003] Using a voltage sensor for DC anti-reverse detection, the cost is too high, will reduce the competitive advantage of the enterprise; if the resistance divider is used to detect the DC side voltage, the cost will be reduced, but the main circuit and the control circuit will not be safely isolated, reducing the cost. System security features. Combining the above factors, the proposed method can reliably detect whether the DC side is reversed, which can not only reduce the cost, but also improve the safety characteristics of the system. Contents of the invention [0004]...
Claims
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IPC IPC(8): G01R31/02
Inventor 谭理华朱泓
Owner 江苏宏宝电子有限公司