This is my first post and i have done a lot of research, however im still at the brick wall I hit weeks ago. I have lost count of how many nights ive stayed up until 7:30am the next morning trying to get this sorted. So i thought maybe someone on here could help me. Ive read the data sheets for the L298, browsed the web and had a look in some books for absolutley ages trying to find out what the problem is.
Basically, im currently building a project that is used for detecting and classifying underwater targets on board an AUV. Im using the Proteus ISIS package to simulate my design. I have a 24V DC supply, 7805 5V voltage regulator this allowing the logic inputs to the L298 H-bridge to operate at lower voltage levels. A L298 H-bridge in which the outputs from the h-bridge are connected to the primary windings of the transformer, with a turns ratio of 1:12.5. The outputs of the h-bridge should be 24V and then be 'boosted' (multiplied by 12.5) to give me my high voltage output readings.
Im having difficulty with the outputs of the L298. I have connected my 24V supply to VS and the 5V from the voltage regulator into Vcc of the L298. In1 & In4, In2 & In3 are connected in parallel to reduce the stress on each channel, and so are out1 & 4, out2 and out 3 of the l298. When i apply a logic HIGH (5v from regulator) to the Enable line and In1, 1n4, and a LOW (0V) to in2 and in3, the outputs of the h-bridge show 23.9V on out1,out4 (which are connected together in parallel) and also on out2 and out3 . My thought was that out1,out4 should be putting out +24V and out2,out3 showing -24V. The other problem i am encountering is, on the secondary winding of the transformer, i have placed 2 voltage probes and the voltages im getting are so rediculously small, 1.9x10^-13 .
They should be about +/-300V on the secondary side of the transformer. I have missed out the rectifer stage of the circuit in this description.
If anyone could give me a hand or even some advice. I really have honestly spent so much time on this and everything/test i try just doesnt seem to solve anything. Im not one to give up but this is my last resort. Any advic/tips would be very much appreciated. I can included a diagram later on if needed. Thanks again for taking time to read.
Fergie.
Basically, im currently building a project that is used for detecting and classifying underwater targets on board an AUV. Im using the Proteus ISIS package to simulate my design. I have a 24V DC supply, 7805 5V voltage regulator this allowing the logic inputs to the L298 H-bridge to operate at lower voltage levels. A L298 H-bridge in which the outputs from the h-bridge are connected to the primary windings of the transformer, with a turns ratio of 1:12.5. The outputs of the h-bridge should be 24V and then be 'boosted' (multiplied by 12.5) to give me my high voltage output readings.
Im having difficulty with the outputs of the L298. I have connected my 24V supply to VS and the 5V from the voltage regulator into Vcc of the L298. In1 & In4, In2 & In3 are connected in parallel to reduce the stress on each channel, and so are out1 & 4, out2 and out 3 of the l298. When i apply a logic HIGH (5v from regulator) to the Enable line and In1, 1n4, and a LOW (0V) to in2 and in3, the outputs of the h-bridge show 23.9V on out1,out4 (which are connected together in parallel) and also on out2 and out3 . My thought was that out1,out4 should be putting out +24V and out2,out3 showing -24V. The other problem i am encountering is, on the secondary winding of the transformer, i have placed 2 voltage probes and the voltages im getting are so rediculously small, 1.9x10^-13 .
They should be about +/-300V on the secondary side of the transformer. I have missed out the rectifer stage of the circuit in this description.
If anyone could give me a hand or even some advice. I really have honestly spent so much time on this and everything/test i try just doesnt seem to solve anything. Im not one to give up but this is my last resort. Any advic/tips would be very much appreciated. I can included a diagram later on if needed. Thanks again for taking time to read.
Fergie.