81001-450-53-R | MITSUBISHI | Device using photoelectric isolation method

Description

81001-450-53-R | MITSUBISHI | Device using photoelectric isolation method

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The power switching 81001-450-53-R adopts an isolated driving method, which isolates the multi-channel driving circuit, control circuit, and main circuit from each other. The main purpose of this design is to avoid catastrophic consequences. Although isolation driving can be divided into two methods: electromagnetic isolation and photoelectric isolation. Due to the low frequency of excitation required in this article being around 4Hz and the high frequency being around 100Hz, the poor common mode suppression ability and slow transmission speed of optoelectronic isolation are not important; Meanwhile, due to the advantages of small size, simple structure, and the ability to reduce interference, photoelectric isolation is adopted in this device. The isolation element uses TLP521 optocoupler (see Figure 2). The PWM waveforms of the RC0 and RC1 pins of the microcontroller are connected to two optocouplers through two 470 ohm resistors. When the 81001-450-53-R high level arrives (RCl is the bottom level), the optocoupler connected to RC0 conducts (the optocoupler connected to RC1 does not conduct).

Thus, the excitation coil is energized through the main circuit; Similarly, when RC1 reaches a high level (RC0 is the bottom level), the optocoupler connected to RC1 conducts (the optocoupler connected to 81001-450-53-R does not conduct). Thus, the excitation coil is energized in the opposite direction through the main circuit. Repeat the cycle. Generate a waveform on the excitation coil with the same frequency as the corresponding pin on the microcontroller. It’s just that the amplitude is different. At the same time, on the basis of IR2110 hardware ensuring dead time voltage. At the high level falling edge and the low level rising edge of the low frequency. A program segment with a dead time voltage delay of 0.01ms is specifically designed in the lower computer program for software delay. The 81001-450-53-R is to further ensure that the power transistor does not experience overlapping conduction during operation, which may cause damage. Increase reliability. An example of dead time is shown in Figure 1.

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