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Controllable silicon dimming circuit with nondestructive leakage circuit and method thereof

A bleeder circuit and silicon dimming technology, applied in the field of power electronics, can solve the problems of high energy consumption and complex bleeder circuit structure, and achieve the effect of improving utilization efficiency and simple circuit structure

Active Publication Date: 2014-06-18
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a thyristor dimming circuit with a lossless discharge circuit, which effectively solves the problems of complex structure and high energy consumption of the discharge circuit in the prior art

Method used

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  • Controllable silicon dimming circuit with nondestructive leakage circuit and method thereof
  • Controllable silicon dimming circuit with nondestructive leakage circuit and method thereof
  • Controllable silicon dimming circuit with nondestructive leakage circuit and method thereof

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Effect test

Embodiment 1

[0041] see figure 1 , is a schematic diagram of a discharge circuit commonly used in the prior art. Taking the power stage circuit as a single-stage flyback converter circuit as an example, since it is necessary to provide a charging current loop for the thyristor circuit to ensure the normal operation of the circuit , whose bleeder circuit consists of a resistor R D , capacitance C D , Diode D D and switch tube Q AD wait, from figure 1 It is not difficult to see that its circuit structure is complex, and the corresponding circuit cost is relatively high. In addition, the bleeder circuit can also be figure 2 way, a resistor R is connected in series between the bus voltage and the ground B and capacitance C B , the circuit structure is simple, but because it is connected to the bus voltage, it needs to consume electricity all the time.

[0042] In view of the above technical problems, the present invention provides a thyristor dimming circuit with a lossless discharge ...

Embodiment 2

[0051] On the basis of Embodiment 1, the present invention also provides an enable signal generating circuit 40, please refer to Figure 4 , so as to output an enable signal to the control circuit 30 and the discharge circuit 20 . The dimming circuit in this embodiment still takes the flyback topology composed of the thyristor 101, the rectifier bridge 102 and the power stage circuit 103 as an example. The enabling signal generating circuit 40 includes: a comparison circuit 401 and a single pulse generating circuit 402 .

[0052] The comparison circuit 401 receives and compares the phase-missing input voltage V in and a threshold signal V th , outputting a pulse signal according to the comparison result, the single pulse generating circuit 402 receives the pulse signal, and accordingly outputs the enable signal EN which remains valid in the second time interval.

[0053] It should be noted that the comparison circuit 401 may be a comparator U1, the non-inverting input termi...

Embodiment 3

[0060] When the comparator U1 is used in the comparison circuit 401, the Figure 5 It is not difficult to find that the comparator will output a high level during the period from point M to point N. In order to shield this part of the signal, it is ensured that the enable signal EN remains valid only within the second preset time interval. The enabling signal generating circuit further includes a phase angle detection circuit 4011 and a first switch tube S1, such as Figure 6 shown, aims at the phase loss of the input voltage V in When the angle is between 90° and 180°, the comparison circuit is controlled to output a high level.

[0061] Specifically, the first switching tube S1 can be connected to the threshold signal V th and the non-inverting input terminal of the comparator U1, correspondingly, the input terminal of the phase angle detection circuit receives the input voltage V of the phase loss in , the output terminal is connected to the control terminal of the first...

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Abstract

Thyristor dimming circuits and methods are disclosed herein. In one embodiment, a thyristor dimming circuit can include: (i) a thyristor and a rectifier bridge configured to receive a sinusoidal AC voltage, and to generate a phase-loss input voltage; (ii) a power stage circuit configured to have the phase-loss input voltage applied thereto, the power stage circuit having a main switch and being configured to drive a lamp load through electrical conversion; and (iii) a discharging circuit configured, during a first predetermined time interval, to control the main switch to operate with a fixed duty cycle at a fixed frequency, where the first predetermined time interval begins prior to an absolute value of the sinusoidal AC voltage being reduced to zero, the first predetermined time interval ending when the phase-loss input voltage is again applied to the power stage circuit.

Description

technical field [0001] The invention relates to the field of power electronics, and more specifically relates to a thyristor dimming circuit with a non-destructive discharge circuit and a method thereof. Background technique [0002] In the prior art, in order to ensure the normal operation of the thyristor circuit, it is generally necessary to set a discharge circuit in the circuit to provide a charging current loop for the thyristor circuit, please refer to figure 1 , is an active discharge circuit commonly used in the prior art, specifically including multiple components such as resistors, capacitors, diodes, and switch tubes, from figure 1 It is not difficult to see that the circuit structure is complex, the corresponding circuit cost is relatively high, and at the same time, power loss is unavoidable. [0003] In addition, the bleeder circuit can also be figure 2 way, a resistor R is connected in series between the bus voltage and the ground B and capacitance C B ,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B33/0815H05B45/10Y02B20/30H05B45/385H05B45/3725
Inventor 余峰黄晓冬
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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