Help for Half Bridge Driver

[ji_yasin]

In my Solenoid driver project I an using IRS2304S half bridge driver to drive solenoid as my input voltage is below 20V and IR2304 works from 10-20V. I have a requirement to operate solenoid from 4V/5V to 25V input. So I am looking for a half bridge driver which can operate from 5V-25V with logic section compatible to IRS2304S. Please help me in finding.. I have searched a lot and went vein so I am seeking professional help. Please help..Datasheet attached for reference

 

[mtwieg]

You have to be more clear about your requirements. What drive voltage does the solenoid need, and what supply voltage do you have available? Why do you think you need a half bridge to drive a solenoid, rather than a simple low side switch with a catch diode?

 

[ji_yasin]

Hi,

The solenoid is driving from an external 105V source as it requires the same. The Supply voltage what I have is buck converted 25V. I am using a two half bridge connected to solenoid to operate as H bridge so it can opened by driving in one direction using a 105V stored in a capacitor and closed by driving in opposite direction using 45V stored in capacitor as closing requires less voltage.

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The currently used half bridge driver IC operating supply voltage specification is between 10-20V. The supply voltage is derived from a capacitor which is charged from battery. When battery power is not there my supply will start reducing from 18V to 10V. I am using a 470uf*2no. of capacitor so as my understanding is the discharge time will be ((470uF*2)*(18-10))/(5mA). 5mA is my discharge current and I am getting only nearly 2 sec. I want to increase this 2 Sec to atleast 5Sec. For that I added one more 470uF capacitor and thinking to raise the 18V battery to 24V and selecting a half bridge driver that can operate from 24V to 4V so that I will get ((470uF*3)*(24-4))/5mA = 5.64Sec. I am not sure I am thinking in the right direction. Please help..

 

[mtwieg]

Hi,
The solenoid is driving from an external 105V source as it requires the same. The Supply voltage what I have is buck converted 25V.

Okay so you have 105VDC and 25VDC...

I am using a two half bridge connected to solenoid to operate as H bridge so it can opened by driving in one direction using a 105V stored in a capacitor and closed by driving in opposite direction using 45V stored in capacitor as closing requires less voltage.

Is this some sort of latched/bistable solenoid? It's common for them to have two coils which can be driven independently to open/close the solenoid with simpler circuitry. Do you have a datasheet for the solenoid?

The currently used half bridge driver IC operating supply voltage specification is between 10-20V. The supply voltage is derived from a capacitor which is charged from battery. When battery power is not there my supply will start reducing from 18V to 10V. I am using a 470uf*2no. of capacitor so as my understanding is the discharge time will be ((470uF*2)*(18-10))/(5mA). 5mA is my discharge current and I am getting only nearly 2 sec. I want to increase this 2 Sec to atleast 5Sec. For that I added one more 470uF capacitor and thinking to raise the 18V battery to 24V and selecting a half bridge driver that can operate from 24V to 4V so that I will get ((470uF*3)*(24-4))/5mA = 5.64Sec. I am not sure I am thinking in the right direction. Please help..

Okay so now there is a removable 18V battery involved... you need to pose some sort of schematic because I can't make sense out of this.

Why not use the 25V supply to step down to 10-20V with a simple linear regulator, then use that for gate drive? Also 5mA of current is a lot for a simple gate driver to consume (unless you are using high frequency PWM).