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There is actually a chip by Maxim that enables an ideal diode MAX16914, MAX16915. These ICs control 2 FETs so that the voltage lost is I x Rds-on, realistically a few millivolts with the right FET.
I can maybe help but need more information.
Are you using a board that's already made or do you have a circuit diagram?
Are you using MPASM assembly language or some sort of compiler (BASIC, C, etc.)
Have you done any programming before?
Have you chosen your LCD yet? If not I can suggest...
MosFET Driver Problem
Need help in best way to drive MosFETs as shown in the attachment.
The supply varies from +30 to +100V and -30 to -100V. It varies in balance so that the + and - voltages are always the same.
The supplies are around ground and the drive is also reference to ground.
I...
Please help me by suggesting the best (most efficient) topology for my design. I'm hoping for 70%+ efficiency.
I need to generate +100v and -100v from a single 8v battery. Max load on the 100v rails will be 180 mA pulsed and 5 mA average.
I have considered a boost and buck-boost for the +100...
± 150 V pulses are referenced to ground, actually they are ±xxx mA pulses where xxx ranges from 10 to 300 mA. The output needs to be controlled constant current because the load can vary up to 1000 ohms.
First there will be a (up to) 300 uS + pulse and then a small (200uS) gap and then a (up...
Thanks for the quick response Karesz, that chip looks useful but it's just one of many SMPS switcher control ICs out there.
What I'm still struggling with is which topology offers the best solution in terms of generating the high voltage I need with reasonable efficiency.
My requirement is to step up from 5 to 9 V to ± 100 to 150 V with a PIC controlling the voltages. I can do the PIC bit but I'm unsure on which SMPS topologies would be best.
The ±100 to 150 V supplies will be required to deliver up to 300 mA pulses into a load that will be in the range of 500...
Re: CB0703-PCB for "PICkit 2" DIY(Do It Yourself)
I've ordered the BB0703+ 128 and intend to use it with MPLAB 8.5
I have a project that uses a 16F690 and I've designed in a 6 pin ICSP connector (only 5 used) that brings all the necessary pins out. I've been programming this on a PICstart+...
OK, I know I'm a masochist for using the 16F690 but I was limited to chips that have a timer 1 gate. I have the chip running for real but I'm stuck in the simulator in trying to get C2 to gate T1 and generate interrupts.
The problem is that it doesn't work on the simulator. I set up a toggle...
The coax I'm thinking of using is easily able to carry 10A; at 12 V DC that's only 120W. It has the advantage that the DC power noise and the signal on the coax center will be screened by the coax shield.
Using one of the protocols supported by the PIC family will allow bi-directional data to...
I want to have 2 PICs communicating with each other over a DC power line that's running at 12V and maybe carrying 10A. It will be driving motors so there will me some noise. Max distance is probably around 50m. The attachment shows the basic approach but I'm not sure how best to approach putting...
rfzheng
You are right, the circuit I created was only so I could look at the FET drive; as I said before, V2 is replaced by a PIC that will sense the output voltage and adjust the PWA accordingly.
Right now I'm looking at a SEPIC system that uses a coupled inductor and only needs a low-side...
driving fet
I'm designing a SMPS and have looked at various circuits. This is actually going to be a battery charger. See attachment; V1 is a 15 V dc supply and V2 is a 200 kHz 5v pp square wave. The load is connected across C2. In the final version, a PIC will replace V2 to drive the FET...
esc design sensorless
I'm looking for information on how to drive a model brushless 3 phase motor. There are many electronic speed controllers (ESCs) available that convert a radio control (RC) servo PWM signal into a motor drive but I want to design my own. I need to know how the ESC senses...
vk3bhr
I've adapted the front end for this frequency counter (see diagram) from a design byPhil Rice VK3BHR and it works well. Now I want to put in some front end protection for the AT-41533-TR1 emitter follower front end transistor, it's rated at a max of 1.5V Vbe and the 74AC161 is good for...
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