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A quasi-single-stage high power factor constant current circuit and device

A high power factor, constant current circuit technology, applied in output power conversion devices, DC power input conversion to DC power output, high-efficiency power electronic conversion, etc. Application and other issues, to achieve the effect of simple circuit structure, reduced ripple current, and beneficial circuit cost

Active Publication Date: 2015-09-16
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with figure 1 Take the single-stage Buck PFC circuit as an example. Although the circuit structure is simple and the circuit cost is low, the disadvantage is that there is a large ripple current (usually 100Hz ripple current) in the output load, which will cause flicker and cannot be applied to some pairs. Applications with high stroboscopic requirements

Method used

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  • A quasi-single-stage high power factor constant current circuit and device
  • A quasi-single-stage high power factor constant current circuit and device
  • A quasi-single-stage high power factor constant current circuit and device

Examples

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no. 1 example

[0042] refer to figure 2 , figure 2 Shows the quasi-single-stage high power factor constant current device of the first embodiment, including a quasi-single-stage high power factor constant current circuit and a control circuit 200, wherein the quasi-single-stage high power factor constant current circuit includes a rectifier bridge B 1 , input capacitance C in , the first inductance L 1 , Bus capacitance C 1 , the first diode D 1 , switch tube Q 1 , the second diode D 2 , Sampling resistor R sen , the second inductance L 2 , output diode D o and the output capacitor C o .

[0043] Furthermore, the rectifier bridge B 1 The input terminal of the AC power supply signal is connected and rectified, and the rectifier bridge B 1 The positive output terminal is connected to the input capacitor C in The first terminal, the first inductance L 1 The first end of the bridge rectifier B1 The negative output terminal is connected to the input capacitor C in The second end ...

no. 2 example

[0053] refer to Image 6 , Image 6 Shown is a quasi-single-stage high power factor constant current device of the second embodiment. The main circuit of this embodiment is basically the same as that of the aforementioned first embodiment, and the working principle is also basically the same, so it will not be described in detail. The main circuit of this embodiment and figure 2 The first embodiment shown is different in that the contact point between the control circuit 300 and the main circuit changes. In this embodiment, the sampling resistor R sen The first end of the ground, the sampling resistor R sen The second terminal of the control circuit 300 is connected to the current sampling terminal CS, so the current information sent to the control circuit 300 is the negative second inductor current information, which can also be realized after being reversed inside the control circuit 300. figure 2 The basic functions of the first embodiment shown, such as power factor ...

no. 3 example

[0055] refer to Figure 7 , Figure 7 Shown is a quasi-single-stage high power factor constant current device of the third embodiment. The main circuit of this embodiment and figure 2 The first embodiment shown differs in that the second inductance L 2 The current zero-crossing detection method is different. In this embodiment, the second inductance L is added with 2 coupled auxiliary winding W a , auxiliary winding W a used to detect the second inductance L 2 The current zero-crossing information, the second inductance L 2 equivalent and auxiliary winding W a coupled to form a transformer, the second inductor L 2 The auxiliary winding W a The eponymous terminal is grounded, the auxiliary winding W a The different-named terminal is connected to the zero-crossing detection terminal ZCD of the control circuit 200 . The main circuit of this embodiment and figure 2 The first embodiment shown is basically the same, and the working principle is also basically the same...

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Abstract

The invention provides a quasi-single-stage high power factor constant current circuit and device. The quasi-single-stage high power factor constant current circuit comprises a rectifier bridge, an input capacitor, a first inductor, a bus capacitor, a first diode, a switching tube, a second diode, a sampling resistor, a second inductor, an output diode and an output capacitor, wherein the first end of the first inductor is connected with the first end of the input capacitor; the first end of the bus capacitor is connected with the second end of the first inductor; the anode of the first diode is connected with the second end of the bus capacitor, and the cathode of the first diode is connected with the negative output end of the rectifier bridge; the first power end of the switching tube is connected with the second end of the first inductor; the anode of the second diode is connected with the second power end of the switching tube, and the cathode of the second diode is connected with the negative output end of the rectifier bridge; the first end of the sampling resistor is connected with the second power end of the switching tube; the first end of the second inductor is connected with the second end of the sampling resistor; the cathode of the output diode is connected with the second power end of the switching tube, and the anode of the output diode is connected with the second end of the bus capacitor; and the first end of the output capacitor is connected with the second end of the second capacitor, and the second end of the output capacitor is connected with the anode of the output diode. Compared with a two-stage structure, the quasi-single-stage high power factor constant current circuit is simpler, which is beneficial to cost reduction; and compared with a single-stage structure, the quasi-single-stage high power factor constant current circuit is beneficial to reduction of load ripple current.

Description

technical field [0001] The invention relates to switching power supply technology, in particular to a quasi-single-stage high power factor constant current circuit and device. Background technique [0002] Due to the presence of non-linear components and energy storage components in most electrical equipment at present, the input AC current waveform will be severely distorted, and the input power factor of the grid side is very low. In order to meet the harmonic requirements of the international standard IEC61000-3-2, Power factor correction (PFC) devices must be added to these electrical appliances. [0003] Traditional active power factor correction circuits generally adopt boost (Boost) topology, buck-boost (Buck-boost) topology or step-down (Buck) topology. Among them, the Boost topology has the characteristics of easy control, simple driving, switching operation in the entire power frequency cycle, and the power factor of the input current can be close to 1. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M1/42H02M1/14
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 谢小高叶美盼蔡拥军吴建兴
Owner HANGZHOU SILAN MICROELECTRONICS