DC controllable transient response isolation switch

Abstract

The invention discloses a DC controllable transient response isolation switch. The DC controllable transient response isolation switch comprises an optocoupler, an isolation power source module, and a bilateral control MOS tube; the input end of the optocoupler is provided with a first pin for receiving a level signal, the second pin of the optocoupler input end is grounded, the isolation power source module is connected with the fourth pin of the optocoupler output end to supply power for the optocoupler; the bilateral control MOS tube comprises a MOS tube 1 and a MOS tube 2, the source electrode of the MOS tube 1 is connected with the source electrode of the MOS tube 2, the third pin of the optocoupler output end is connected with the grid electrode of the MOS tube 1 and the grid electrode of the MOS tube 2, the drain electrode of the MOS tube 1 and the drain electrode of the MOS tube 2 are respectively connected with two ends of an external circuit, the isolation power source module is externally connected with a DC power source through a power supply pin. The isolation switch disclosed by the invention is fast in response speed, capable of realizing bilateral shutoff, free from bounce and free from current leakage, and hardly needs drive power consumption; and the MOS tube can be flexibly configured according to use demand so that the switch is suitable for an AC or DC circuit.

Description

technical field [0001] The invention belongs to the technical field of switch control, and in particular relates to a DC controllable instantaneous response isolating switch. Background technique [0002] At present, in the field of switch control, optocouplers, relays, contactors, and load switches are commonly used. Among them, the optocoupler switch is suitable for signal circuits. It uses light as a medium to transmit electrical signals. When the input terminal is powered on, the light emitter emits light, and the light receiver generates photocurrent after receiving the light, which flows out from the output terminal. It realizes the "electrical-optical-electrical" conversion, and uses light as a medium to couple the input signal to the output. The optocoupler has a short break time, which can reach the microsecond level, small size, long life, and no contact , strong anti-interference ability, insulation between output and input, one-way signal transmission and other ...

AI Technical Summary

Problems solved by technology

[0003] However, although the response time of the optocoupler is short, which can reach the microsecond level, its current transmission capacity is not strong, the order of magnitude is basically in the milliampere level, and it can only conduct electricity in one direction, and the general output has a voltage drop; the relay is realized by hardware wiring. There are many and complex connections, large volume, high power consumption, low flexibility and scalability, long switching time, the order of magnitude is in the order of ten milliseconds, and the current carrying capacity can reach several amperes, or even a dozen amperes, but it is usually for 220V For AC applications, for DC, the maximum is two or three amperes, and the withstand voltage does not exceed 30V; the current capacity of the contactor can reach several hundred amperes, and the DC voltage can also reach several hundred volts, but it is expensive and bulky , the channel time is long, and the order of magnitude has reached the level of ten milliseconds; although the load switch has a simple structure, it lacks overheating protection and cannot turn off the short-circuit current. Devices and systems do not work properly

The above-mentioned types of switches have limitations on the scope of application and occasions, some cannot be used in tens of volts, and some are not suitable for hundreds of volts of direct current or the current is very low to a few amperes, and most of them need to be driven power switch to operate using the

[0004] Therefore, several traditional switches have relatively large limitations, not only have a single function, but also have limited application range and high cost.

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