Need help with coupled inductor

M

me_shaurya

New Member
Hi, I'm new to electronics but have some prior experience with robotics. I'm currently working on a project that involves creating a TENS unit and a shock generator, all within the compact form factor of a wristwatch.

I've selected the following components for the design:

1. LPR6235-752SMR – Coupled Inductor


2. 470µF 450V Ceramic Capacitor


3. UF4007 – Diode


4. SL5N50D, AO3434A, or IRLR7843 – MOSFET options



I'll be using the XIAO ESP32-S3, which provides a PWM signal with a voltage range of 0–3.3V.

However, I'm facing challenges in finalizing the most efficient and safe circuit to achieve a variable output of 0 to 300V. I've attached an example circuit from the coupled inductor's datasheet.

Could someone also help me theoretically calculate the output voltage and component behavior before I test it physically?
 

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(1) What power source are you using? If battery, which specific battery?

(2) how long is a TENS session (what's the pattern of a TENS session? E.g, 5 seconds of shocks and sleep for 10 seconds. Or, 10 minutes continuous, then off for 50 minutes, ....?

(3) How long do you want the battery to last?
 
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ZipZapOuch said:
(1) What power source are you using? If battery, which specific battery?
Click to expand...
Lipo battery 3.7v 450mah 1C
ZipZapOuch said:
(2) how long is a TENS session (what's the pattern of a TENS session? E.g, 5 seconds of shocks and sleep for 10 seconds. Or, 10 minutes continuous, then off for 50 minutes, ....?
Click to expand...
I will be using it mainly for alarm and also some other tens functionality for 5 sec
ZipZapOuch said:
(3) How long do you want the battery to last?
Click to expand...
May be a day so it will also power my watch(esp32s3 xiao , oled , buzzer and a small vibration motor)
 
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If you look at one of my patents on image 3 ... the oscillator section 406, uses a "pump and dump" in combination with an SCR to dump the capacitor charge into the coil .... The transformer was a 1:10 ratio transformer we had specially made at the time. The "trick" when I was developing this circuit was not a direct drive from the power source into the coil, but to dump a charged capacitor into the coil instead.

Patent Reference:

US6500210B1 - System and method for providing a sense of feel in a prosthetic or sensory impaired limb - Google Patents

An apparatus for providing a person with stimuli corresponding to an external operation on a sensor of a prosthetic device used in conjunction with a prosthetic or sensory impaired limb. A lower limb prosthesis includes sensors located in a prosthetic foot, contacts in the socket producing...
patents.google.com
 
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Can you also please suggest a simple circuit for my project
 
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