Electronic switch with soft starting and protection function for direct current power distribution system
A technology of DC power distribution and protection functions, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high price and high failure rate of mechanical switches, and avoid the risk of inrush current, overcurrent and overvoltage, Effect of improving reliability and service life
Pending Publication Date: 2019-04-23
SHANGHAI HONYO ELECTRIC CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the technical problems of high failure rate and high price of mechanical switches in the prior art, and provide an electronic switch with soft start and protection functions for DC power distribution system, which combines the controllable The switch function, the overcurrent protection function of the circuit breaker, and the soft start function, as well as the monitoring and communication functions, etc., can greatly improve the reliability of the DC power distribution system, reduce the failure rate of the system, and reduce the cost of the system
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Embodiment 1
[0033] Such as figure 2 As shown, the rated voltage of the DC system is 800V, the rated power of the load is 8kW, and the load capacitance is 2000uF; the load is officially started after two seconds of DC power supply.
[0034] The rated current is 10A, and the soft-start resistance Rs=50Ohm is selected, then the peak surge current is 800V / 50Ohm=16A. The starting time constant is 50Ohm×2000uF=0.1sec, and the starting delay can be set as 1 second. The rated power of the soft start resistor Rs can be selected as 500W. The main switch Q1 can be selected as a 1200V silicon carbide MOS tube with a conduction resistance of 100mOhm; the soft start switch Qs can be selected as a 1200V silicon carbide MOS tube with a conduction resistance of 300mOhm; the backup protection can be selected as a fast switch with a rated voltage of 1kV and a rated current of 20A. Fuse F1.
[0035] During the use of this embodiment, when the DC power distribution system is normally opened, the soft star...
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The invention discloses an electronic switch with a soft starting and protection function for a direct current power distribution system. The electronic switch comprises a standby protection circuit (100), a main switching circuit (200), a soft starting circuit (300), a current collection circuit (400) and an intelligent control circuit (500) in sequential connection,,wherein the soft starting circuit (300) is connected in parallel with the main switching circuit (200); the intelligent control circuit (500) is used for monitoring and storing the work state information of the standby protectioncircuit (100), the main switching circuit (200), the soft starting circuit (300) and the current collection circuit (400), and controlling the main switching circuit (200) and the soft starting circuit (300) through the sampling result transmitted by the current collection circuit (400); the main switch circuit (200) comprises a main switch (Q1); the soft starting circuit (300) comprises a soft starting switch (Qs); the main switch (Q1) and the soft starting switch (Qs) are semiconductor switches. The electronic switch provided by the invention can greatly improve the reliability of the direct current power distribution system; the system fault rate is reduced; the system cost is reduced.
Description
technical field [0001] The invention relates to the field of smart grids, in particular to an electronic switch with soft start and protection functions for a DC power distribution system. Background technique [0002] With the popularity of DC power supply system applications, the demand for DC power distribution protection switches is increasing. Currently, mechanical switches are commonly used, such as DC circuit breakers and DC contactors. However, in the actual application process, due to the large capacitance on the power supply side and the load side in the DC system, at the moment the switch is closed, due to the charging and discharging of the capacitor, a very large inrush current will be caused, which is different from the AC system. , the peak value of the inrush current often far exceeds the rated value of the switching element, which seriously affects the service life of the switching element and causes a high failure rate; in addition, unlike the AC system, th...
Claims
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Login to View More IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 叶阳
Owner SHANGHAI HONYO ELECTRIC CO LTD