I / O isolated power adapter

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I / O isolated power adapter

The characteristic of this kind of power adapter is that the output voltage and the input voltage are isolated, at the same time, the I / O has high electrical strength, and the circuit isolation is realized by the primary / secondary of the pulse transformer. Therefore, it is also called pulse transformer coupling power adapter or parallel switching voltage regulator. However, at present, this kind of power adapter is not the same as the parallel power adapter in theory. The power adapter is directly connected to the load, so it is more appropriate to call it the isolated power adapter. This kind of power adapter circuit changes greatly. It can be simply divided into the following categories:

Single ended self excitation type. The power adapter is a self-excited oscillation tube, which completes on / off control in the process of intermittent oscillation. The power adapter and the secondary rectifying circuit actually constitute the DC / DC converter, and the output voltage of the DC / DC converter controlled by the output voltage constitutes the power adapter. Therefore, it is also called DC converter power adapter.

Single ended allodyne type. There are independent pulse generator and control circuit, output controllable pulse, control the on / off of power adapter, constitute the DC converter process of other excitation. The output voltage is sampled as the control driving pulse to achieve the stability of the output voltage.

The isolated power adapter consists of half bridge and bridge converter. Whether self excitation or other excitation, two half bridge power adapters are connected in series in the power supply circuit, and the neutral point is connected with the pulse transformer. The two tubes are controlled by different driving pulses of different time sequence, turn on / off in turn, and form different phase pulses in the pulse transformer. Bidirectional symmetrical pulses provide stable voltage to the load by full wave rectification. The four power adapters of the bridge circuit are connected by the bridge, and the pulse transformer (load circuit) is connected between the two midpoint of the opposite arm. The four power adapters are driven respectively to make the two power adapters of the opposite arm turn on / off in turn, forming bidirectional symmetrical pulse in the pulse transformer, and supplying power to the load after full wave rectification. The maximum output power of half bridge circuit can reach 500W, and the bridge circuit can reach above 500W. If the power adapter is used in parallel, a higher power power adapter can be formed. 1.3.3 integrated / modular power adapter

This is not a part of the power adapter or an integrated or modular product of a function, but all circuit parts (except for pulse transformer) At present, there is a small power top type of other excitation integrated circuit power adapter, with the maximum output power of more than 100W. There are few peripheral components, all of which are integrated on one chip except the secondary rectifier. The two types of power supply adapters adopt the circuit structure of input / output isolation.

The modular power adapter is of thick film process structure, and the pulse transformer is also of thick film process. This kind of power adapter has high working frequency and output power of more than 300W. As long as the input terminal is connected with 300V DC (high-voltage battery power, DC generator power, or DC voltage formed by mains power through rectifier), the secondary can output stabilized low-voltage DC, 1.3.4 special type of power adapter

The aperiodic small power adapter of RCC type is translated as the power adapter of oscillatory blocking converter. The power supply is used for small power supply, not only the circuit is simple, but also can adapt to the large changes of load.

Resonant power adapter, using LC resonance principle to change the waveform of power adapter, making it a quasi sine wave. At present, the practical circuit is series resonant type, which can be controlled by pulse width or frequency. This is a type with rapid development and potential.