How to modify this H-bridge motor drive circuit so that the MOS tubes of the upper and lower bridge arms will not be turned on at the same time

天天1

How to modify this H-bridge motor drive circuit so that the MOS tubes of the upper and lower bridge arms will not be turned on at the same time [Copy link]

 

J2 in the figure is the motor. Currently, the two MOS tubes rotating forward have burned out. I suspect that the program timing is not written correctly. I want to modify the hardware so that Q11 and Q3, Q4 and Q5 of the MOS tubes will not be turned on at the same time. How should I modify it?

天天1

This is the H-bridge driver circuit

天天1

天天1

Is there any way to add a delay link in the hardware circuit?

elvike

Add interlock, add dead time

天天1

elvike posted on 2018-7-23 15:54 Add interlock, add dead time

How do I add interlock? I have seen a circuit that requires four AND gates and two NOT gates. It seems too complicated. I would like to ask if there is a simpler one.

maychang

In your circuit, the four-tube drive is completely controlled by the program, and the software is much easier to modify than the hardware. If you want to use hardware to generate dead zones (that is, what you said, "to make Q11 and Q3, Q4 and Q5 of the MOS tube not turn on at the same time"), you do need some gate circuit chips. If you think using gate circuit chips is too complicated, you have to use a special switching power supply control chip instead, and the whole circuit has to be modified, which is more troublesome.

S3S4S5S6

The hardware needs to add gate circuits to coordinate, which will increase the cost and introduce risk points. This is obviously a matter of software optimization, so why must hardware be used to do it?

天天1

S3S4S5S6 posted on 2018-7-23 17:25 Hardware needs to increase gate circuits to cooperate, which will increase costs and introduce risk points. This is obviously a matter of software optimization, why must hardware be used to do it?

Because the person who wrote the software burned the MOS tube when adjusting the circuit, saying that the hardware needs to be optimized, so I can only think of a solution

elvike

天天1 posted on 2018-7-23 17:30 Because the person who wrote the software burned the MOS tube when adjusting the circuit, and said that the hardware needs to be optimized, I can only think of a way

Such software, just open it directly

freebsder

For reference, this is a copy of the Freescale reference design.

天天1

freebsder posted on 2018-7-23 20:31 For reference, this is copied from the freescale reference design.

I will build one later to see the effect

S3S4S5S6

elvike posted on 2018-7-23 20:08 Just open this kind of software

I guess what kind of relationship does it have with the boss?

elvike

天天1 posted on 2018-7-23 16:51 How do I add interlocking? I have seen a circuit that requires four AND gates and two NOT gates. It seems too complicated. I would like to ask if there is a simpler one.

A few gate circuits are already very simple. Add a few resistors and capacitors to achieve the control of dead time. If this is still too troublesome, then fight with the software and have a drink together and let the software implement it for you

topwon

天天1 posted on 2018-7-23 17:30 Because the person who wrote the software burned the MOS tube when adjusting the circuit, and said that the hardware needs to be optimized, I can only think of a way

When the software adjusts the dead zone protection interval, the hardware first disconnects the MOS tube circuit behind it, and hangs up an oscilloscope to observe the drive waveform. In this way, there is no psychological pressure when debugging the software. Of course, you both software and hardware need to know what the correct waveform is first, and then connect the MOS tube to measure the effect when it meets the target.