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Dongguan Jiuqi Industrial Co., Ltd.
Contact: Mr.liang
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Tel: 0769-81818179
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Input/output isolated power adapter
| Input/output isolated power adapter |
| This type of power adapter is characterized by the isolation of the output voltage from the input voltage and the high resistance between I/O, and the isolation of the circuit is achieved through the primary/secondary of the pulse transformer. Therefore, also known as pulse transformer coupled power adapter or parallel switch voltage regulator. However, this kind of power adapter is not called parallel power adapter in theory, as the power adapter directly parallel on the load, so it is more appropriate to call the isolated power adapter. The circuit of this kind of power adapter varies greatly, which can be divided into the following categories: Single-ended self-excited type. The power adapter is a self-excited oscillation tube, which can complete on/off control in the process of intermittent oscillation. The power adapter and the secondary rectifying circuit actually constitute the DC/DC converter, which is controlled by the output voltage of the DC/DC converter. Therefore, also known as dc converter type power adapter. Single-ended shunt. There are independent pulse generator and control circuit, output controllable pulse, control power adapter on/off, constitute the process of dc conversion. After sampling the output voltage, it is used as the control driving pulse to realize the stability of output voltage. Isolated type power adapter composed of half-bridge type and bridge type converter. Either self - excited or other - excited, two half - bridge power adapters are connected in series to the power supply circuit. The two tubes are controlled by different driving pulses in different time series and turn on/off in turn to form pulse with different phase in the pulse transformer. The bi-directional symmetrical pulse provides stable voltage to the load in the form of full wave rectification. The four power adaptors of the bridge circuit are connected to the indirect pulse transformer (load circuit) at the two midpoints of the arm, and the four power adaptors are driven respectively, so that the two power adaptors of the arm turn on/off in turn, and form a bi-directional symmetric pulse in the pulse transformer, and supply power to the load after full wave rectification. The maximum output power of the half-bridge circuit can reach 500W, and the bridge circuit can reach over 500W. If a power adapter is used in parallel, a more powerful power adapter can be formed. 1.3.3 integrated/modular power adapters This does not refer to a part of the power adapter or an integrated or modular product of a function, but to the entire circuit (except for the pulse transformer). At present, there is a small power TOP type shunt integrated circuit power adapter, the maximum output power can be more than 100W. Peripheral components are very few, except the secondary rectifier circuit, all integrated in a chip. Both types of power adapters adopt input/output isolation circuit structure. The modularized power adapter is a thick-film process, and the pulse transformer is also a thick-film process. This kind of power adapter works at a high frequency, and the output power can reach over 300W. As long as the input end is connected with 300V dc (high-voltage battery power supply, dc generator power supply, or dc voltage generated by the local power supply through the rectifier), the secondary can output the stabilized low-voltage dc power, 1.3.4 special type of power adapter Aperiodic RCC type small power adapter, the original translated as oscillating blocking type converter power adapter. The power supply is used for small power supply, not only the circuit is simple, but also can adapt to the large change of load. Resonant power adapter, using LC resonance principle to change the waveform of the power adapter, so that it becomes a quasi sine wave. At present, the practical circuit is series resonant, which can use pulse width control and frequency control to achieve voltage stabilization. This is a type that is growing very fast and has potential. The principle, circuit variation, performance and selection range of the above power adapter will be introduced in detail in the forward power supply. |
| | release time：2019.10.14 Source： |
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Contact: Mr.liangTel:+86-13122876672Tel:0769-81818179Fax:0769-81806179 E-mail:haulwee@vip.163.com
Address: Kongwu District, Guxia, Shipai town, Dongguan city, China Zipcose:523,339
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