Inverter circuit and gate turn-off clamp circuit design

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Probe domestic switch needle KG300B head diameter 3.0 normally closed switch needle total length is 5

Overview:
UPS (Uninterruptible Power System), which is an uninterruptible power supply, is a constant voltage constant frequency uninterruptible power supply that contains an energy storage device and uses an inverter as a main component. Mainly used to provide uninterrupted power supply to a single computer, computer network system or other power electronic equipment. When the mains input is normal, the UPS supplies the mains voltage to the load for use. At this time, the UPS is an AC mains voltage regulator, and it also charges the internal battery; when the mains is interrupted (accident blackout) At the same time, the UPS immediately supplies 220V AC power to the load through the inverter conversion method, so that the load maintains normal operation and protects the load soft and hardware from damage.

Uninterrupted Power Supply (UPS) is a high-quality power supply with stable frequency, voltage regulation, purity and uninterrupted power. With the increasing quality requirements of electronic and electrical equipment, it has become a must for many important occasions. Auxiliary power supply.

1 inverter circuit and its control
The principle of PWM technology is due to the emergence of fully-controlled power semiconductor devices, which not only greatly simplifies the structure of the inverter circuit, but also has fundamental differences in the control strategy compared with the semi-controlled devices of the thyristor type. The control technology is changed to pulse width control technology, referred to as PwM technology. PwM technology can perform harmonic suppression extremely effectively, and has obvious advantages in frequency and efficiency, so that the technical performance and reliability of the inverter circuit are significantly improved. The inverter constructed by PwM mode has a constant DC voltage input, and can realize voltage regulation and frequency modulation in the same inverter through PwM technology. Since the inverter has only one controllable power stage, the structure of the main circuit and the control loop is simplified, so that the size is small, the quality is light, and the reliability is high. Because of the set pressure and frequency modulation, the adjustment speed is fast and the dynamic response of the system is good. In addition, the PwM technology not only provides better inverter output voltage and current waveform, but also improves the power factor of the inverter to the AC grid.

Sinusoidal Pulse Width Modulation (SPWM) technology has been widely used in the control of inverters, and there are many sinusoidal pulse width modulation methods, which are not described here. This circuit uses a frequency doubling modulation method, which is briefly described below.

The basic structure of the full-bridge inverter circuit is shown in Figure 1. In the frequency doubling modulation method, the method of generating the gate pulse signals Vg1 to Vg4 of the four switching transistors is as shown in FIG. 2. The waveforms of the four switch tube gate pulse signals Vg1 to Vg4 and the voltages VAB between the two bridge arms midpoints A and B are also shown in FIG. 2.

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