H-Bridge - Revision history

Adamcolton: /* Microcontroller Driver */

2020-10-13T19:58:04Z

Microcontroller Driver

← Older revision		Revision as of 19:58, 13 October 2020
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	The high side voltage would be a small flyback driver. The PWM provides a driver for a BJT. The input would be driven with a opto-coupler and would go high when the voltage is above the threshold.		The high side voltage would be a small flyback driver. The PWM provides a driver for a BJT. The input would be driven with a opto-coupler and would go high when the voltage is above the threshold.

			The actual bridge controller would be designed to use BJTs to drive the MOSFETS.

	[[Category:Electronics]]		[[Category:Electronics]]

2020-10-13T19:54:01Z

Microcontroller Driver

← Older revision		Revision as of 19:54, 13 October 2020
Line 57:		Line 57:
	* B high		* B high
	* B low		* B low
	* PWM signal for		* PWM signal for high side driver

	Probably accept input over something like SPI. This would allow it some flexibility.		Probably accept input over something like SPI. This would allow it some flexibility.
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	* Hold (A/B)		* Hold (A/B)
	* Direction/Speed		* Direction/Speed
			* High side voltage feedback

	These could also be provided as steps with times. So a whole program could be sent to the controller then a "START" signal could trigger it. This would allow multiple controllers to run in unison.		These could also be provided as steps with times. So a whole program could be sent to the controller then a "START" signal could trigger it. This would allow multiple controllers to run in unison.

			The high side voltage would be a small flyback driver. The PWM provides a driver for a BJT. The input would be driven with a opto-coupler and would go high when the voltage is above the threshold.

	[[Category:Electronics]]		[[Category:Electronics]]

2020-07-15T13:51:20Z

Microcontroller Driver

← Older revision		Revision as of 13:51, 15 July 2020
Line 57:		Line 57:
	* B high		* B high
	* B low		* B low
			* PWM signal for

	Probably accept input over something like SPI. This would allow it some flexibility.		Probably accept input over something like SPI. This would allow it some flexibility.

2020-07-15T13:45:57Z

@@ Line 50: / Line 50: @@
 == VFD ==
 half bridges can be used to create a VFD for a 3 phase induction motor.
 [[Category:Electronics]]

2020-07-15T13:09:21Z

← Older revision		Revision as of 13:09, 15 July 2020
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	Opto-isolators need current regulation. For small voltage ranges, resistors can be used. For wide ranges, two transistors and two resistors can form a current regulator.		Opto-isolators need current regulation. For small voltage ranges, resistors can be used. For wide ranges, two transistors and two resistors can form a current regulator.

	=== Mosfets ==		=== Mosfets ===
	Using a combination of P-channel and N-channel mosfets produces a fairly simple circuit. But the P fets will be more expensive, have a higher resistance and a lower max voltage.		Using a combination of P-channel and N-channel mosfets produces a fairly simple circuit. But the P fets will be more expensive, have a higher resistance and a lower max voltage.

2020-07-15T13:09:11Z

← Older revision		Revision as of 13:09, 15 July 2020
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	For low power, this should be able to directly drive the HB, but I need to look at it to make sure there's not an Emitter/Base path through the circuit. For higher power circuits add a buffer before.		For low power, this should be able to directly drive the HB, but I need to look at it to make sure there's not an Emitter/Base path through the circuit. For higher power circuits add a buffer before.

	=== Voltage Range ==		=== Voltage Range ===
	If a narrow voltage range is used, circuits can be made quite simple. If a wide voltage range is needed, the circuit gets more complex to compensate.		If a narrow voltage range is used, circuits can be made quite simple. If a wide voltage range is needed, the circuit gets more complex to compensate.

2020-06-11T23:23:01Z

Discrete Driver

@@ Line 7: / Line 7: @@
 == Discrete Driver ==
-Low side is fairly easy. At low voltages, a BJT can be used. At higher voltages, we need to raise the gate voltage because it should only be 10-20v lower than the high side.
+=== All ===
-The high side driver is a pain because high side N-Chan driving is always a pain. As long as it will never go high for long periods, a bootstrap cap can be used.
+=== BJT  ===
 == VFD ==
 half bridges can be used to create a VFD for a 3 phase induction motor.
 [[Category:Electronics]]

2019-04-06T00:48:34Z

← Older revision		Revision as of 00:48, 6 April 2019
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	I think DRV8701 allows you to mount your own mosfets, which may allow me to increase the power capacity. look for "Full-Bridge Gate Driver" or "full-bridge pre-driver"		I think DRV8701 allows you to mount your own mosfets, which may allow me to increase the power capacity. look for "Full-Bridge Gate Driver" or "full-bridge pre-driver"

	http://www.modularcircuits.com/blog/articles/h-bridge-secrets/		* http://www.modularcircuits.com/blog/articles/h-bridge-secrets/
			* https://www.youtube.com/watch?v=xbJ0dT-VZIQ

	== Discrete Driver ==		== Discrete Driver ==

2019-04-05T22:09:23Z

← Older revision		Revision as of 22:09, 5 April 2019
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	The high side driver is a pain because high side N-Chan driving is always a pain. As long as it will never go high for long periods, a bootstrap cap can be used.		The high side driver is a pain because high side N-Chan driving is always a pain. As long as it will never go high for long periods, a bootstrap cap can be used.

			== VFD ==
			3 half bridges can be used to create a VFD for a 3 phase induction motor.
	[[Category:Electronics]]		[[Category:Electronics]]

2018-10-09T15:11:12Z

← Older revision		Revision as of 15:11, 9 October 2018
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	http://www.modularcircuits.com/blog/articles/h-bridge-secrets/		http://www.modularcircuits.com/blog/articles/h-bridge-secrets/

			== Discrete Driver ==
			The bridge itself is pretty simple, but driving it is awful.

			Low side is fairly easy. At low voltages, a BJT can be used. At higher voltages, we need to raise the gate voltage because it should only be 10-20v lower than the high side.

			The high side driver is a pain because high side N-Chan driving is always a pain. As long as it will never go high for long periods, a bootstrap cap can be used.

	[[Category:Electronics]]		[[Category:Electronics]]