High-power-factor low-harmonic-distortion constant current circuit and device
A high power factor, constant current circuit technology, used in output power conversion devices, DC power input to DC power output, electrical components and other directions, can solve problems such as large ripple current, inapplicability, and stroboscopic
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no. 1 example
[0120] refer to image 3 , image 3 It shows the high power factor low harmonic distortion constant current device of the first embodiment, which includes a high power factor low harmonic distortion constant current circuit and a constant current control driver 301 connected thereto. Among them, the constant current circuit with high power factor and low harmonic distortion includes rectifier bridge BR, pre-stage circuit and post-stage circuit. The pre-stage circuit is a buck-boost circuit, and the post-stage circuit is a step-down circuit. The same switch Q 1 and bus capacitance C b .
[0121] More specifically, the pre-stage circuit in the first embodiment includes: an input capacitor C in , the first diode D 1 , the first inductance L 1 , Bus capacitance C b , the second diode D 2 , switch tube Q 1 ; The post-stage circuit includes: bus capacitor C b , switch tube Q 1 , the third diode D 3 , Sampling resistor R s , the second inductance L 2 , the fourth diode ...
no. 2 example
[0133] refer to Figure 7 , Figure 7 Shown is the high power factor low harmonic distortion constant current device of the second embodiment. The high power factor low harmonic distortion constant current circuit of this embodiment is basically the same as the aforementioned first embodiment, and the working principle is also basically the same, so it will not be described in detail.
[0134] The high power factor low harmonic distortion constant current circuit of this embodiment and image 3 The first embodiment shown is different in that the junction of the constant current control driver 701 and the high power factor low harmonic distortion constant current circuit is changed. In this embodiment, the ground terminal SGND of the constant current control driver 701 is connected to the sampling resistor R s The first terminal of the constant current control driver 701, the current sampling terminal CS is connected to the sampling resistor R s Therefore, the current infor...
no. 3 example
[0136] refer to Figure 8 , Figure 8 Shown is the high power factor low harmonic distortion constant current device of the third embodiment. This embodiment and image 3 The first embodiment shown differs in that the second inductance L 2 The current zero-crossing detection method is different.
[0137] In this embodiment, it also includes the second inductance L 2 Coupled auxiliary winding L 2a , auxiliary winding L 2a used to detect the second inductance L 2 The current zero-crossing information, the second inductance L 2 equivalent and auxiliary winding L 2a coupled to form a transformer, the auxiliary winding L 2a The opposite end of the ground, the auxiliary winding L 2a The terminal with the same name as the resistor divider network 302 is connected to the input terminal. Wherein, the resistor divider network 302 includes resistors R connected in series 1 and resistor R 2 .
[0138] The main circuit of this embodiment and image 3 The first embodiment sho...
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