Proportional output circuit
Proportional output circuit
(OP)
I am working on a project of electronic interface circuit design. I describ it as following:
We can get a TTL level sensor output(0.5-4.5V), depends on the percentage of this output to 5V, we want to output a proportional output to battery voltage(chnage in vehicle application), such as 0.5V from sensor then 25%Vbatt+, 2.5V then 50%Vbatt+, 4.5V then 75%Vbatt+. As battery voltage chang, even if sesnor output doesn't change, the output voltage have to change to obtain the desired percentage.
I am beginner in electonic design, anybody could give me a suggestion or idea on how to do it?
Thanks
We can get a TTL level sensor output(0.5-4.5V), depends on the percentage of this output to 5V, we want to output a proportional output to battery voltage(chnage in vehicle application), such as 0.5V from sensor then 25%Vbatt+, 2.5V then 50%Vbatt+, 4.5V then 75%Vbatt+. As battery voltage chang, even if sesnor output doesn't change, the output voltage have to change to obtain the desired percentage.
I am beginner in electonic design, anybody could give me a suggestion or idea on how to do it?
Thanks





RE: Proportional output circuit
TTFN
RE: Proportional output circuit
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However, I would use a PIC processor, A/D the analog signals and scale/multiply in code.
RE: Proportional output circuit
The original posting is less than clear.
RE: Proportional output circuit
an open collector buffer (e.g. 7407) with a pull-up R
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: Proportional output circuit
RE: Proportional output circuit
RE: Proportional output circuit
Actually we are trying to make our own signal conditioning circuit to amplify the Joystick's analog output signal(hall effect sensor output0.5-4.5V) and control a propotional solenoid.
The propotional solenoid has three terminals, two of them are connected to vehicle battery+ and battery-, the third one is an analog signal used to determine how much the valve will be opened. The driver module integrated inside the valve will compare this analog signal with the vehicle battery voltage in another terminal, if it is equal to 50% vehicle battery voltage, then valve is in neutral, if it is equal to 25% battery voltage then valve fully open in one direction and if it is 75% battery voltage then valve fully open in another direction. So the above percetage(not the absolute voltage value) determine the valve openess.
So our signal conditioning circuit should implement following function:
Mapping TTL analog signal(0.5V~4.5V)from Joystick to another analog signal range(25%BatteryVoltge ~ 75%Battery Voltage) linearly, and then output this signal to proportional valve driver module.
That means if 0.5V from Joystick, the circuit outputs 25%BatteryVoltage and 4.5V relates a 75%BatteryVolatge.
Again to the same analog input value from joystick, if the vehicle battery voltage changed, the circuit's output voltage value varied too, but the ratio between circuit out and battery voltage should be approximately constant so long as the input isn't change.
Maybe this is very easy to some people, especially to Mr. IRStuff. I hope I didn't piss you off by posting so easy question.
Anyway I appeciate any help and will think about all your suggestions.
To Sreid:
RE: Proportional output circuit
TTFN
RE: Proportional output circuit
I have a pretty simple solution. Use a switching regulator chip like the TL494. Tie the two outputs together with a pull up and average the output with a simple filter. A voltage fed to the control circuit will give a % duty cycle (5-95%) and the output will follow the 12V of the vehicle. This should be quite stable and cheap.
RE: Proportional output circuit