- #1

electricalguy

Gold Member

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Hi, I would like some assistance with a DC to DC boost converter that isn't powering the load I require. The boost converter is one I purchased online. It is a DROK numerical control regulator, 900 watt boost converter.

Input voltage DC 8-60 volts

Input current DC 0-15 amps

Output voltage DC 10-120 volts

Output current DC 0-15 amps

Conversion efficiency 85%

Working frequency 150khz

The inductor value is 53uHenry

The input capacitor is 470 uFarad

The output capacitor is 0.1uFarad

There are 3 smoothing caps on the output which are 330uFarad each

The mosfet part number is:

1638AJ FDH 055N15AE

There was a part number on the diode but it is really small and hard to read, I will put down the number that I think it is but could be wrong:

5TP520J30CT

It has a forward voltage drop of 0.247 volts

The issue I am having is the boosting circuit isn't working for the load I have and with my limited expertise in electrical circuits I am hoping one of the experts can let me know how to adjust the components to make it work. So I took some measurements across the various components during the testing. My load has a resistance of 2 ohms and what I am trying to achieve is a voltage of 8 to 9 volts and an amperage of 0.4 to 0.7 amps if that is at all possible with the value of the load resistance.

The inductor voltage is 0.618 volts AC

The frequency across the components is 16.51khz

The voltage across the 470uF cap is 20.89 volts DC, the voltage across the output caps is 20.97 volts DC, the voltage across the mosfet is 20.80 volts DC, the voltage across the diode is 0.235 volts DC. The power supply I am using is a sky toppower STP3010 300 watt DC variable power unit. I was putting 21.3 volts at roughly 9 amps into the circuit. Across the load there was 19.7 volts DC at 7.2 amps DC.

I know the voltage is higher than what I am looking for but was trying to get the system to work by putting a high amount of power in the circuit. If anyone can give me some suggestions it would be very much appreciated.

**Boost converter specs**Input voltage DC 8-60 volts

Input current DC 0-15 amps

Output voltage DC 10-120 volts

Output current DC 0-15 amps

Conversion efficiency 85%

Working frequency 150khz

The inductor value is 53uHenry

The input capacitor is 470 uFarad

The output capacitor is 0.1uFarad

There are 3 smoothing caps on the output which are 330uFarad each

The mosfet part number is:

1638AJ FDH 055N15AE

There was a part number on the diode but it is really small and hard to read, I will put down the number that I think it is but could be wrong:

5TP520J30CT

It has a forward voltage drop of 0.247 volts

The issue I am having is the boosting circuit isn't working for the load I have and with my limited expertise in electrical circuits I am hoping one of the experts can let me know how to adjust the components to make it work. So I took some measurements across the various components during the testing. My load has a resistance of 2 ohms and what I am trying to achieve is a voltage of 8 to 9 volts and an amperage of 0.4 to 0.7 amps if that is at all possible with the value of the load resistance.

The inductor voltage is 0.618 volts AC

The frequency across the components is 16.51khz

The voltage across the 470uF cap is 20.89 volts DC, the voltage across the output caps is 20.97 volts DC, the voltage across the mosfet is 20.80 volts DC, the voltage across the diode is 0.235 volts DC. The power supply I am using is a sky toppower STP3010 300 watt DC variable power unit. I was putting 21.3 volts at roughly 9 amps into the circuit. Across the load there was 19.7 volts DC at 7.2 amps DC.

I know the voltage is higher than what I am looking for but was trying to get the system to work by putting a high amount of power in the circuit. If anyone can give me some suggestions it would be very much appreciated.

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