For a small square wave quality problem-CodePudding

I set up a 24 volt drive circuit of electromagnetic valve, gets the oscilloscope measurement, found 24 FuFang wave quality is not very good, have a curve, this how to solve? (driving circuit P3.4 square wave signal quality is good, with an oscilloscope measurement, waveform is very neat,)

CodePudding user response:

Electromagnetic valve parallel reverse fly-wheel diode, pay attention to when selecting diode maximum current parameters,

CodePudding user response:

reference 1st floor yishumei response:

, electromagnetic valve, reverse fly-wheel diode in parallel diode when pay attention to the maximum current parameter,

Should choose how much current

CodePudding user response:

refer to the second floor weixin_43619829 response:

Quote: refer to 1st floor yishumei response:

Electromagnetic valve parallel reverse fly-wheel diode, pay attention to when selecting diode maximum current parameters,

Should choose how much current?

Also consider diode reverse voltage

CodePudding user response:

refer to the second floor weixin_43619829 response:

Quote: refer to 1st floor yishumei response:

Electromagnetic valve parallel reverse fly-wheel diode, pay attention to when selecting diode maximum current parameters,

Should choose how much current?

Diode parameters according to your choice of solenoid valve to determine the electrical parameters,
My experience: peak current starting current of solenoid valve is 1.5 ~ 2 times, reverse pressure more than five times as much as in electromagnetic valve power supply voltage,
The original poster can find 1 n400x series diode,

CodePudding user response:

Your oscilloscope signal reversed phase? Solenoid valve should be a voltage drop to zero quickly, back to the high level there are excessive

CodePudding user response:

reference 5 floor worldy reply:

your oscilloscope signal reversed phase? Solenoid valve should be a voltage drop to zero quickly, back to the high level have excessive

Well, I tried, in turn, probe and under ground, oscilloscope waveform is messy, I don't know how to return a responsibility

CodePudding user response:

reference 4 floor yishumei response:

Quote: refer to the second floor weixin_43619829 response:

Quote: refer to 1st floor yishumei response:

Electromagnetic valve parallel reverse fly-wheel diode, pay attention to when selecting diode maximum current parameters,

Should choose how much current?

Diode parameters according to your choice of solenoid valve to determine the electrical parameters,
My experience: peak current starting current of solenoid valve is 1.5 ~ 2 times, reverse pressure more than five times as much as in electromagnetic valve power supply voltage,
The original poster can find 1 n400x series diode,

The specific function of parallel rectifier diode is what

CodePudding user response:

Q1 with NMOS, Q2 for PMOS

CodePudding user response:

refer to 6th floor weixin_43619829 response:

Quote: refer to the fifth floor worldy reply:

Your oscilloscope signal reversed phase? Solenoid valve should be a voltage drop to zero quickly, back to the high level have excessive

Well, I tried, in turn, probe and under ground, oscilloscope waveform is messy, I don't know what's going on

Not allow you to reverse connection wiring, is some oscilloscope have polarity switch, click on the waveform will all show, you will oscilloscope ground wiring your earthed, probe can be received Q2_C

Reverse wave clutter estimation is your contact no good