Decreasing current in preload circuit

In summary, the conversation discusses a difficulty with a preload circuit and the objective of applying a specific current at a certain voltage and decreasing it linearly at a higher voltage. The suggestion of using a voltage controlled resistor circuit with a FET is mentioned, but the speaker suggests using a voltage-to-current converter circuit with an opamp and NPN transistor triggered by a comparator circuit with hysteresis. The speaker also asks for a sketch of this proposed solution.
  • #1
rrburkha
1
0
I am working on a preload circuit and am having a difficult time with it. The objective is to apply .15A @ 24V when a control signal reaches 7.5V and decrease current in a somewhat linear fashion to 0A when the control signal reaches 10V.

I was looking into a voltage controlled resistor circuit using a FET.

Any other suggestions or help would be appreciated.
 
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  • #2
rrburkha said:
I am working on a preload circuit and am having a difficult time with it. The objective is to apply .15A @ 24V when a control signal reaches 7.5V and decrease current in a somewhat linear fashion to 0A when the control signal reaches 10V.

I was looking into a voltage controlled resistor circuit using a FET.

Any other suggestions or help would be appreciated.

Sounds like you could use a voltage-to-current converter circuit with an opamp and NPN transistor. You'd gate that circuit with the output of a comparator circuit that tests the input control signal voltage against 7.5V (with a little hysteresis built into the comparator, of course).

Can you sketch something like that up?
 

FAQ: Decreasing current in preload circuit

1. What is a preload circuit?

A preload circuit is a type of electrical circuit that is used to control the amount of current flowing through a system. It typically includes a resistor or other component that can be adjusted to change the amount of current in the circuit.

2. Why would someone want to decrease current in a preload circuit?

There are several reasons why someone might want to decrease current in a preload circuit. One common reason is to reduce power consumption and save energy. Another reason could be to protect sensitive components from damage due to excessive current.

3. How can current be decreased in a preload circuit?

Current can be decreased in a preload circuit by adjusting the resistance in the circuit. This can be done manually by changing a variable resistor or automatically using a feedback control system.

4. What are the potential consequences of decreasing current in a preload circuit?

If the current is decreased too much, the circuit may not function properly. This could result in a loss of power or other issues. Additionally, if the current is decreased too much, the circuit may become unstable and cause oscillations or other unwanted behavior.

5. Are there any safety concerns when working with a preload circuit?

Yes, there are some safety concerns when working with a preload circuit. High voltage and high current can be dangerous, so it is important to take proper precautions and use appropriate equipment when working with a preload circuit. It is also important to follow proper procedures and guidelines to avoid damaging the circuit or causing harm to oneself or others.

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