Want to take advantage of the electromagnetic valve of the open and shut off the flow of control (proportional valve price is a little high, the company to control costs, don't want to use,)

Anyway I want to control on-off solenoid valve, is a high speed on-off, switching frequency is around 50-80 times in the 1 s (optional solenoid valve is support, can reach 100 times), I met the question is: now I can't circuit control electromagnetic valve action, can't open, I use the PWM wave to control triode, in turn, control the switch of MOS tube, for electromagnetic valve power supply and power outages, circuit is as follows:


I have some questions so:
(1) general solenoid valve (power for work, this will not work, no special support PWM wave to control electromagnetic valve) can have a PWM wave to control quickly opened and shut off?
(2) whether there is something wrong with my circuit design, resulting in PWM control solenoid valve (opened)?
(3) their access to some data, it was said the size of the PWM wave will eventually be converted into current, my current is too small to open the solenoid valve, oneself also know for motor speed control PWM wave, so that transformed the average high and low voltage, thus realize the fast and slow,
(4) there is a phenomenon is: I board connection solenoid valve, with electricity, electromagnetic valve have no reaction, waveform oscilloscope for testing, no PWM wave output, electricity before take off solenoid valve test waveform is OK, this way the new burning program measurement and waveform, didn't understand why?
(5) have the experience of friends, can you provide a train of thought, or drive circuit?

CodePudding user response:

Such high switch frequency serious affecting the service life of solenoid valve, the noise is also a big problem, or an alternate plan early,

CodePudding user response:

Principle of the circuit itself is no problem, to see whether the electromagnetic valve drive parameters (voltage, current, start time, closing time, delay, etc.) are compound requirements, intuitive feel 100 times/S speed is not low,
With the principle of PWM to control the flow of fluid in theory also what each question,
In the electromagnetic valve can meet the requirements under the premise of experiment to grope for slowly, some Suggestions are as follows:
1: a separate test on and off solenoid valve can be action,
2: reduce the speed, the 1 1 second to switch,
3: speed increases gradually, test the speed of the solenoid valve is the most ideal,
4: adjust the duty ratio, the test liquid flow rate, liquid flow rate to calculate the PWM control the proportion of relations,
I wish you good luck

CodePudding user response:

Now you want to achieve function, life, has given the noise, 150 can also meet, also have a quiet valve,

CodePudding user response:

The building Lord you can put your choice of solenoid valve model, parameter tell you?

CodePudding user response:

reference 4 floor xuyaqi029 response:

you can you choose a solenoid valve model, parameter to tell you,

Clippard E310X - AF12

CodePudding user response:

There are several possible: no impact frequency width is not enough or too fast, support the pulse electromagnetic valve operation frequency should be less than 8 k (external regulation), ordinary should be below 1 k,
In addition, feeling Q1 control should be used in the negative side, rather than the location of the now,

CodePudding user response:

PWM frequency of use is how much, how much is the duty cycle?

CodePudding user response:

Logically speak, if ordinary can achieve proportional valve, that why to produce the proportional valve?

CodePudding user response:

Solenoid valve is essentially a large inductance, said a second can break a 100 times, I doubt it. Lz can receive an oscilloscope on the curve of the electric current measure a small resistance + storage oscilloscope (string), stability test and 90% current need how much time

CodePudding user response:

refer to 7th floor snow-capped mountains strange barbary response:

using the frequency of the PWM is how much, how much is the duty cycle?

Automobile ABS with suggested frequency in 30 to 60 hz, and the width,
In addition, the start current is bigger, so I hope to start the duty ratio greater than 30, 10 milliseconds after reply to value, otherwise it is can't open (or not),

CodePudding user response:

Feeling momentarily off switch valve, fluid caused by instantaneous stamping is very high, so frequently, may cause damage to pipeline,

Suggestions can use parallel multiple switch valve simulation, using multiple scale level simulation proportional valve, in order to reduce the stamping,

CodePudding user response:

But the use of multiple switch valve, the cost is high, and pipeline joints aperture conversion,

CodePudding user response:

As long as the valve and pipe to withstand, use relay control (PMW) is best!

CodePudding user response:

Think this idea is not correct, China can't make bad product for people to use, should improve the quality of products, not others, security products by good quality assurance, to improve well-being, to avoid waste of resources, to enjoy life,

CodePudding user response:

Electromagnetic valve:
1. The solenoid valve can be regarded as an inductance, is actually an electromagnet, startup is takes a lot of charging current to the coil, in order to ensure the quick opening, so the beginning will drive not use small duty cycle, because the current is too small, the coil magnetic flux is not enough, can't open the valve,
2. The flow control should not be used on the design principle of the electromagnetic valve is the Boolean switch (only on or off), not only the product reliability is not high, and high maintenance costs, late (is the life of the solenoid valve and switch frequency related, you switch frequency is 50 times of 1 s, the products you plan to use how long? 1 months? Or two months?)
3. The realization of the high speed on-off solenoid is based on the driving circuit (starting current is very large), including large current start fast, quick release; Burn it drive circuit unreliable, solenoid valve, driving is often the case,
4. Suggest check at home and abroad have such success stories, suggest to buy finished product drive chip, you can refer to auto electromagnetic valve drive,

CodePudding user response:

references to the tenth floor Glen_hsu response:

Quote: refer to 7th floor snow-capped mountains strange barbary response:

PWM frequency of use is how much, how much is the duty cycle?

Automobile ABS with suggested frequency in 30 to 60 hz, and the width,
In addition, the start current is bigger, so I hope to start the duty ratio greater than 30, 10 milliseconds after reply to value, otherwise it is can't open (or not),

Thank you for your reply, I'll give it a try!