Date：2025-03-18 Categories：Industry News Hits：854 From：Guangdong Youfeng Microelectronics Co., Ltd(YFW)
The three-phase bridge rect circuit is a common power electronic circuit, mainly used in the scenario of converting alternating current into direct current. This circuit uses three-phase power supply, which can provide a more stable efficient direct current power supply than the single-phase rectifier circuit. The basic components of the three-phase bridge rectifier circuit include 6 diodes, a three- alternating current power supply, and a load. These 6 diodes are connected in a bridge structure, hence the name three-phase bridge rectifier circuit. During each cycle, will always be two diodes conducting, converting the alternating current power supply voltage into direct current voltage to supply the load. The specific working principle is as follows: When the sequence of the alternating current power supply voltage is A-B-C, assuming that the A-phase voltage is the highest, the diode from A phase to the load will, and at the same time, since the C-phase voltage is the lowest, the diode from C phase to the load will also conduct. In this way, the voltage A phase will be supplied to the load through these two conducting diodes. When the phase sequence of the alternating current power supply voltage changes, such as B-C-A, at this time, the other two different diodes will conduct, to ensure the continuous supply of electricity. In this way, through the alternate conduction of the six diodes, the-phase bridge rectifier circuit can continuously and stably convert the alternating current power supply voltage into direct current voltage. In the bridge rectifier circuit, the alternating current of the phases is connected to the three phase inputs of the bridge, and the load resistor is connected to the output end of the bridge. When the A phase of the alternating current is the positive half cycle, the B and C phases are in the negative half cycle. At this time, the diode at the A phase input will work, and the current will through it to the load resistor. The diodes at the B and C phase inputs are in the off state and no current will flow through them. When the B phase of alternating current is in the positive half cycle, the A and C phases are in the negative half cycle. At this time, the diode at the B phase input will work, the current will flow through it to the load resistor. The diodes at the A and C phase inputs are in the off state. The same principle also applies to the C. In this way, the bridge rectifier circuit can achieve rectification of alternating current, that is, convert it into direct current. In each half cycle, only the current one phase can flow through the load resistor, and its direction is consistent with the alternating current. In this way, the current direction can switch between the positive half cycle and the half cycle, forming a stable direct current power supply. So let's discuss why the bridge rectifier circuit needs four diodes. We need to understand the following aspects:1. Bipolar voltage and unipolar voltage: Alternating current is a bipolar voltage, that is, the polarity of the voltage changes between positive and negative. Direct current is anipolar voltage, and the polarity of the voltage is fixed. Therefore, the process of rectification is to convert bipolar alternating current into unipolar direct current. 2. Half- rectification and full-wave rectification: Half-wave rectification only uses half of the cycle of alternating current, which is simple but has low efficiency. Full-wave rect uses the entire cycle of alternating current, which has high efficiency. However, to achieve full-wave rectification, we need to use a bridge rectifier circuit. 3 Working principle of the bridge rectifier circuit: In the bridge rectifier circuit, the four diodes are connected to form a bridge structure. When the positive half cycle of the alternating comes, the diodes D1 and D2 conduct, D3
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