#82 - How Does an Infinite Switch Work?

Подписаться 2,3 тыс.

Просмотров 3 тыс.

50% 1

In-depth explanation and theory behind how the infinite switch works to regulate power to a cook-top burner. How do infinite switches fail? What are the symptoms? For more information about infinite switches, go to techcircuit.org/how-an-infini...
To donate to The Tech Circuit, click here: techcircuit.org/donate
#infiniteswitch, #appliancerepair, #burnerwontturnoff, #cooktop

Опубликовано:

23 июл 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 13

@jonfreeman9682 Месяц назад

Excellent breakdown of the switch mechanics. I just replaced the switch on my stove but wasn't sure if my old one was working properly or not. Stove is 10 years old and that's the only burner switch I ever use so makes sense it might be worn out but you can't see the inside of the switch if there's soot or carbonization or if maybe the thermal plates are worn.

@vegasbluedevil7328 28 дней назад

I am a kitchen engineer in a big casino and commercial food equipment repair guy by trade. I love infinite switches as opposed to capillary tube thermostats. Much easier to replace, easier to test, more readily available and way less expensive. These should be in everything that doesn't need precision temperature control, of which few things do.

@AgentOffice 5 месяцев назад

Interesting

@Mulakulu 5 месяцев назад

I wonder if a tiny μC with a high voltage mosfet to control PWM would be more cost effective nowadays. It would definitely be more efficient.

@Mulakulu 5 месяцев назад

a tiny single diode rectifier with a capacitor and a voltage divider to power the μC with a stable low DC voltage should be enough for PD to the μC. Not the most efficient, but we're going for low price here

@TheTechCircuit 5 месяцев назад

Triac control is used for microcontroller based systems. The small amount of heat/power used to bend the bi-metal strip is virtually insignificant as compared to the thousand-plus watts of power delivered to the burner. Other than that, when it comes down to it, duty cycle is duty cycle. Also because the high thermal inertia of the elements, the pulse frequency can be extremely low and still be unnoticed (for which traditional infinite switches are ideally suited).

@Mulakulu 5 месяцев назад

@@TheTechCircuit Yeah, you're right about the total power. When I mentioned efficiency, I guess I was referring to the controller. I believe but might be wrong that a small μC will be more efficient than heating up a bimetal strip. It relies on resistive loss, although I guess not that much. Either way, the fast switching of the controller is much more pleasant to the user due to having a seemingly instant power change rather than a noticeable on-off cycle

@petedude2lu3 5 месяцев назад

yes but potentially louder. i had a mercedes that would make a pwm whistle when its lights dimmed

@TheTechCircuit 5 месяцев назад

That was common in some early or not well thought out implementations where the PWM frequency assumingly could have been more well suited for the application.

@freescape08 5 месяцев назад

So what makes it an "infinite" switch?

@TheTechCircuit 5 месяцев назад

There are an infinite number of settings between high and low.

@a.m.1298 3 месяца назад

Thanks. I fucking hate Samsung electric ranges for using these god awful infinite switches

@jonfreeman9682 Месяц назад

To my knowledge all electric ranges use the same type of switches. Not sure but maybe some high end commercial stoves might use different tech instead of pulse modulation. Perhaps variable voltage and current switches but that's not common in home ranges.