How to use a cheap solution to electronically cut off the 800V, 15A power line?

q65050728

20 40V batteries are connected in series to provide power. How can we receive a signal to controllably cut it off (only for emergency use)? And ensure that there is no energy loss during normal use. I found a 1000V, 15A power IGBT. Not to mention the price of 18 yuan, the 5 ohm resistance after it is turned on is unacceptable. I found several 1000V 10A relays, but they are also very expensive.

dwwzl

Let's adopt the solution of small control and large control. The power plant uses recloser

maychang

IGBT does not seem to have a parameter called on-resistance. Power MOS tubes do have this parameter, but the on-resistance of a 1000V MOS tube is not as large as 5 ohms.

bqgup

You can consider using relays. They are small but can control big things. They can be easily controlled by sending high and low levels using a single-chip microcomputer. You can also use wireless or Bluetooth remote control.

PowerAnts

If you want to "ensure that no energy is consumed during normal use", I'm afraid you can only use a pulse-driven mechanical trip circuit breaker. However, the OP seems to be bothered by the 18 yuan, so I'm afraid I can only DIY it.

PowerAnts

There is usually a leakage switch when the mains electricity enters the house. There is an electromagnetic release inside that thing, which does not consume electricity at ordinary times. However, the price of an electromagnetic release with a breaking capacity of 800V and XXXXA is not cheap.

maychang

A trip device is the most suitable. However, if the voltage is above 800V and the DC is to be cut off, this trip device cannot be cheap.

q65050728

Then use the pulse tripper. Thank you for your enthusiastic responses.

q65050728

Why can't I send out more of the 10 core coins after sending out 3 of them? It says "The number of ratings in 24 hours exceeds the limit"

xujian2000

Recommendation: Use two power MOS tubes in series.

qwqwqw2088

Power relays are used for this purpose. It is basically enough to select the maximum on-off voltage and the minimum on-off current. Do not pursue low cost when doing this kind of thing. Safety and reliability are the first priority.

star_66666

It seems very complicated

q65050728

qwqwqw2088 posted on 2018-8-26 19:25 Power relays do this kind of thing. It is basically enough to choose the maximum on-off voltage and the minimum on-off current. Do not pursue low cost and safety when doing this kind of thing...

I feel really popular. I will come here to hang out in the future. Moderator, can't the points I offer for the reward be given out in one post like CSDN?

bqgup

bqgup posted on 2018-8-26 12:05 You can consider using relays. They are small but can control large things. They can be easily controlled by sending a high or low level with a single-chip microcomputer. Wireless or Bluetooth remote control is also possible.

Are you using this solution? ? ? ? ? ?

maychang

"I found several 1000V 10A relays, but they were also very expensive." Is the 1000V 10A relay you found AC or DC? The contact capacity of the relay (the voltage and current allowed to be cut off) is very different for AC and DC. The AC capacity is much larger than the DC capacity. A relay that is allowed to be used in AC 250V 2A may only be 48V 1A in DC. You must pay attention to whether it is AC or DC.