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Hi all, I'm using HIP4082 for a Full Bridge DC motor control circuit. I've constructed the simple inverter circuit which is given in the datasheet of the device and changed it's logic inputs to use the device for motor control. Gate connections of the 4 IRF540 MOSFET's are given below: Top side of the H-bridge: T1 -> BHI; T2 -> AHI; Bottom side of the H-bridge: T3 -> BLI; T4 -> ALI; For motoring in one direction, the input signals I've applied to the HIP4082 are given below; These inputs should switch T1 and T4, while keeping T3 off. The reason for applying an inverse PWM to BLI is to charge the bootstrap capacitor which makes the MOSFET T1 conduct.

ALI -> PWM; BLI -> Inverse PWM; AHI -> logic low; BHI -> PWM; According to the truth table which is given in the datasheet, these input signals should lead to these outputs at the gates of the MOSFETs: T1 -> PWM; T2 -> off; T3 -> inverse PWM; T4 -> PWM While the outputs are exactly like this when the circuit is operating without o load, they change when the motor is connected. Even though I apply logic low to the input AHI, T2 goes to conduction mode as soon as the PWM signal goes to low and stops conducting before the PWM signal again goes to high. This leads to a decrease in the average output voltage level by applying a negative voltage to the motor. What is the reason of this behaviour? Am I applying wrong logic signals? The pictures taken from the oscilloscope screen are given in the attached word document.

Article Library > An Introduction to Brushless DC Motor Control An Introduction to Brushless DC Motor Control. And a three-phase inverter comprising six IGBTs.

The switching freq is 15kHz, bootstrap capacitors are 47nF and values of the delay resistor and gate resistors are 36Kohm and 10ohm, respectively. I changed every component many times with new ones. So it shouldn't be a problem related to a faulty component but i'll do what you said.

Other than that, i tried to connect a 1V power supply across C2 in order to eliminate the probability for that capacitor to charge to Vdd. The result was same.

Can the bootstrap diodes lead to a problem like this? In Intersil's web page it recommends using bootstrap diodes which have a rating of trr. The ground of the scope was connected to the circuit ground and the motor was connected as the load when i took the measurements. The amplitudes of the gate signals were normal. I just shifted the scope channel positions on the y axis and changed the volts/div settings for the second channel (the channel which i connect to upper gates) to make it possible to see both signals at the same time on the screen.

Waveforms are the only things you should look in these images. Ignore the relative positions of the signals on the y axis. In other words, the amplitude of the gate signal of Q2 ( > 60V since the supply voltage for the motor is 60V) was much higher than the amplitude of the voltage at the gate of Q3 (12V), as it should. The pictures i've attached show just the gate voltages of the MOSFETs since i haven't taken any picture of bootstrap voltages yet. To prevent any confusion, i put a picture to show what i'm trying to achieve. I should somehow prevent the capacitor C2 from charging, since i don't want Q2 to conduct.

The same thing applies to C1, if i change the direction of rotation of the motor. Can you tell me, which logic signals should i apply to HIP4082 for a behaviour like in the picture below? The ones that i apply are here: ALI -> PWM; AHI -> logic low; BLI -> Inverse PWM; BHI -> PWM; I guess the problem is about these logic signals.