Timeline for How to prevent a short-circuit (not shoot-through) with this half H-bridge?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Feb 15, 2023 at 23:17 | comment | added | Gil | I got about a dozen of the bridges (they have two BTS7960s on each) from china at about $5 US. | |
| Feb 14, 2023 at 22:52 | comment | added | Drakes | @Gil Hi, I do have a BTS7960, but each one is about $25 here in Canada. Also, doing some tests, they can't actually handle the advertised current with the way the heatsink is mounted (the substrate is between the FETs and the heatsink!) Plus the pin count per coil just shot way up. Also, also, opto-coupled modules will still short-circuit, just not though the uC. | |
| Feb 14, 2023 at 22:47 | comment | added | Drakes | @PStechPaul The second diagram is clever, enabling me to use these modules - let me digest and simulate it more to see the the switching speed will work. | |
| Feb 14, 2023 at 2:22 | comment | added | Gil | This is a suggestion: Take a look at the BTS7960, it has all of what you need in one chip. They are also available as bridge modules which has two of these devices. I purchase them that way (about $6US) but use them as two independent 1/2 bridges. You might want to include a link to your Modules. The ones I found: protosupplies.com/product/d4184-mosfet-control-module have an opto isolator on board. You could copy the circuit and modify to your needs. | |
| Feb 14, 2023 at 1:17 | history | edited | PStechPaul | CC BY-SA 4.0 |
Possible circuits
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| Feb 14, 2023 at 0:58 | history | edited | PStechPaul | CC BY-SA 4.0 |
Possible circuit
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| Feb 13, 2023 at 23:29 | comment | added | Drakes | Sure can. I have an electromagnet with 12.2mH and 2.2ohms. I'd like the microcontroller to turn it on with one polarity, then off, then on with the opposite polarity - with full possible current or PWM. I have two 24V/600W supplies, so I'd like to avoid using an H-bridge (requires sourcing all new parts, plus dealing with dead-time logic). The uC takes care of timing and Hall sensors. I have a surplus of these D4184 modules, and the uC, plus power diodes, so I'd love to make a half H-bridge work with these existing parts. Any ideas? (Thanks for being kind; power electronics are new for me) | |
| Feb 13, 2023 at 22:14 | comment | added | PStechPaul | Perhaps you can provide more details on the requirements for your "pulse motor". Is a half-bridge with both positive and negative drive actually needed? And it should not be too much problem to add a floating power supply and opto-isolator to use your existing modules. | |
| Feb 13, 2023 at 21:57 | comment | added | Drakes | Proper half-bridge module or opto makes sense. I have a surplus of these nFET modules and several coils to build, so I am holding out for hope to use them, but if it is doomed, then it is. Thx. | |
| Feb 13, 2023 at 21:38 | history | answered | PStechPaul | CC BY-SA 4.0 |