pfc circuit, load driving circuit and signal control method

A circuit and compensation signal technology, applied in the field of circuits, can solve problems such as meaninglessness, and achieve the effect of shortening the ineffective adjustment process

Active Publication Date: 2015-08-19
INVENTRONICS HANGZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While the chopper dimmer adjusts the chopping angle α of the chopping voltage from zero to the critical value αx, the output current Io of the PFC circuit remains unchanged, which is meaningless for dimming, and for users, The adjustment process at this stage is an invalid adjustment process

Method used

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  • pfc circuit, load driving circuit and signal control method
  • pfc circuit, load driving circuit and signal control method
  • pfc circuit, load driving circuit and signal control method

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Embodiment Construction

[0058] During the change of the chopping angle α, only when the current control unit is in an open-loop state, the chopping dimmer can realize the dimming function. While the chopper dimmer adjusts the chopping angle α of the chopping voltage from zero to the critical value αx, the output current Io of the PFC circuit remains unchanged, which is meaningless for dimming, and for users, The adjustment process at this stage is an invalid adjustment process.

[0059] After a lot of research, the inventor found that reducing the critical value αx, that is, reducing the maximum chopping angle in the closed-loop state can shorten the time that the current control unit is in the closed-loop state, thereby shortening the ineffective adjustment process. To reduce the critical value αx, that is, to reduce the maximum chopping angle of the closed-loop state, it is necessary to increase the value of the control signal Vr under the same chopping angle condition (because the higher the Vr, t...

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Abstract

A PFC circuit, a load drive circuit and a signal control method. An input end of a PFC circuit (500) receives a chopping voltage; the PFC circuit (500) comprises a main switching tube (S1), a Ton control unit (510), and a detection and compensation unit (520). Within the range of a maximum value, a control signal of the Ton control unit is positively correlated to a chopping angle of the chopping voltage. The detection and compensation unit is used for detecting the chopping angle of the chopping voltage and generating a compensation signal with an amplitude value positively correlated to the chopping angle. A comparison signal of the Ton control unit is controlled according to the compensation signal, so that within the range of the maximum value, the control signal corresponding to an equal chopping angle rises, thereby reducing ineffective regulating process during the dimming process.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a PFC circuit, a load driving circuit and a signal control method. Background technique [0002] In the field of lighting, it is necessary to adjust the brightness or color of the light source in many occasions, which requires the lighting system to have an adjustment function. Currently, the chopper dimming technology is more commonly used, such as figure 1 As shown, the dotted line part is an implementation structure of the existing chopper dimmer. After the grid voltage Vac is acted on by the chopper dimmer, the voltage on the light source load RL is as follows: figure 2 For the chopping voltage shown, the phase angle α corresponding to the triggering conduction time of the transistor TRIAC in the chopping dimmer is the chopping angle of the chopping voltage. The internal resistor R11 of the chopper dimmer is a variable resistor. Adjusting the resistance value of the variable resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42H02M3/335H05B37/02
CPCY02B20/346H05B33/0815H05B45/385Y02B20/30
Inventor 葛良安姚晓莉任丽君
Owner INVENTRONICS HANGZHOU
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