Peak and hold driver circuit

Peak and hold solenoids, also known as saturated switch solenoids, are utilized in place of constant current solenoids when the application requires any of the following:. The peak and hold drive circuit applies a higher current to the solenoid while it is at its open or maximum air gap condition. Once the solenoid has completed its travel to the closed or minimum air gap position, the current is reduced to the hold current level, which maintains the solenoid in this position until the current is removed.

The current amplitude and time duration of the peak and hold drive signals are application dependent and are modified to match a given application. A typical drive signal profile is shown in the graph. However, the "peak" duration could be as short as 1 or 2 milliseconds based upon the needs of the application.

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This is where it gets the name Peak and Hold. It Peaks with a high opening current, but Holds it with a lower more reasonable current for the duration of the called for pulse width because the injector is already open. Most Peak and Hold drivers drive 2 injectors each. This means drivers provides 2 amps per injector and holds with 0. Peak and Hold systems are typically used in higher horsepower, small displacement engines.

The reason being is it allows for a more dynamic operating range of the injectors allowing a quick response time of the injector which is a huge advantage over a saturated driver. Saturated driver circuits should not use a low impedance injector.

This is not recommended. The additional amperage required to open the injector can overheat and burn out the driver.

In addition, the injector can become unstable causing many other drivability issues. If you must use a low imp injector in a saturated driver circuit, you can add resistors to the system. We have a calculator to help determine what ohms and watts to use to still be able to use a higher flowing Peak and Hold injector in your circuitry.

The amperage required to open the injector is within the specs of a high imp injector.