CN105163434B - Anti-jitter phase-controlled dimmer is without frequent flashing control method - Google Patents

Abstract

The present invention provides a flicker-free controller for an anti-jitter phase control dimmer: a no-jitter DC component processing function circuit is set between the output voltage of the low-pass filter and the current control signal in the LED drive power supply, including the following functional blocks: Instantaneous low-pass filter output signal extraction function block, incremental size judgment function block, step output change function block and minimum output judgment function block; the above function blocks are sequentially connected with signals, and have signal feedback between corresponding modules. The present invention also simultaneously provides a flicker-free control method for the anti-jitter phase control dimmer by using the above-mentioned controller. The technology of the present invention is based on shaping the conduction angle output by the phase control dimmer into a corresponding pulse width PWM waveform, and extracting the corresponding low-pass filtered DC component Vin of the pulse width PWM waveform, and increasing the corresponding no The jittering DC component processing function circuit is used to effectively extract the jitter-free DC component corresponding to the output of the phase control dimmer.

Description

No flicker control method for anti-jitter phase control dimmer

technical field

The invention relates to a flicker-free control scheme for a compatible phase control dimmer.

Background technique

In the application field of dimming power supply, there are many dimming methods. Among them, the phase control dimming method is the most popular. Because the phase control dimmer not only provides dimming power, but also provides dimming information. Compared with other dimming solutions, the implementation cost is much lower. And because the phase control dimmer has been popular for more than ten years, it is well compatible with the incandescent lamp used in the existing general lighting and occupies most of the dimming lighting market. Phase-controlled dimmers are divided into leading-cut and trailing-cut phase-controlled dimmers. The thyristor dimmer belongs to the front cut phase control dimmer; the phase control dimmer composed of IGBT or MOSFET belongs to the back cut phase control dimmer.

According to the working principle of the phase control dimmer, when the phase control dimmer is off, the input power is zero; when the phase control dimmer is on, the input power is determined by the output power of the LED drive power supply. In the half cycle of the mains power supply, since the input power is controlled by the phase control dimmer on and off, the output current of the LED dimming power supply has 100Hz or 120Hz ripple; this makes the light emitted by the LED with 100Hz or 120Hz The strobe. This 100Hz or 120Hz strobe has an impact on human health. For this reason, it is hoped that the output of the phase control dimming power supply is a direct current so that the LED output light does not flicker.

In order to achieve the output of the phase-controlled dimming power supply is a direct current so that the LED output light does not flicker, it is necessary to shape the conduction angle of the phase-controlled dimmer output into a corresponding pulse width PWM waveform, and adjust the pulse width PWM waveform Perform corresponding DC component extraction. Due to the asymmetric characteristics of the components in the internal control circuit of the phase control dimmer, the output usually has some jitter, and the corresponding DC component will also produce corresponding jitter, so the DC component without jitter cannot be obtained only through low-pass filtering. How to effectively extract the jitter-free DC component corresponding to the output of the phase control dimmer is a problem that people expect to be solved.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flicker-free control method for an anti-jitter phase control dimmer and a corresponding controller.

In order to solve the above technical problems, the present invention provides a flicker-free controller for an anti-jitter phase control dimmer:

A jitter-free DC component processing function circuit (as shown in Figure 1) is set between the output voltage of the low-pass filter and the current control signal in the LED drive power supply, and the jitter-free DC component processing function circuit includes the following functional blocks: instantaneous low Pass filter output signal extraction function block, incremental size judgment function block, step output volume change function block and minimum output volume judgment function block; described instantaneous low-pass filter output signal extraction function block, incremental size judgment function block, step The input and output volume change function block and the minimum output volume judgment function block are sequentially connected with signals (with signal feedback between corresponding modules).

The present invention also provides a flicker-free control method for the anti-jitter phase control dimmer by using the above-mentioned controller:

The instantaneous low-pass filter output signal extraction function block is to the low-pass filter output voltage Vin when the enabling signal Vsam of the low-pass filter output voltage Vin (instantaneous low-pass filter output signal extraction function block 1) is "1" level condition, in the regulation of the sampling pulse Ft Carry out extraction and sampling at all times; In the incremental size determination function block, the output Va of the instantaneous low-pass filter output signal extraction function block is compared with the output Vb (the output Vb of the actual current jitter-free DC component processing function circuit) , that is, determine the incremental size; if this incremental value is greater than a predetermined set value (this "predetermined set value" is set in the incremental size determination function block), the incremental size determination function block output start control signal Vo is "1" level, thereby starting the stepping output change function block to carry out step refreshment on the output Vb of the actual current non-jittering DC component processing function circuit; if the increment is less than the predetermined set value, the increment size judgment function block outputs the start control signal Vo It is "0" level, and it is not necessary to start the stepping output change function block to maintain the actual current output Vb of the jitter-free DC component processing function circuit;

When the incremental size judgment function block output start control signal Vo was "1" level to start the step output change function block, the step output change function block according to the increment (that is, the difference between Va and Vb) Positive or negative, it will change the increase or decrease of the actual output step (for the output of the step output change function block), and the slope of its increase and decrease is according to the predetermined slope (set in the step output change function block This "predetermined slope") changes; when this actual output Vb step refreshes finally reaches the difference with the instantaneous low-pass filter output signal extraction function block output Va less than the predetermined error value (in the step output change function block When the "predetermined error value" is set), the step output change operation ends; during the step output change operation, the step output change function block output-enable control signal Vsam is "0 "Level keeps the output of the instantaneous low-pass filter output signal extraction function block unchanged; the output of the instantaneous low-pass filter output signal extraction function block Va only after the step output change operation is completed, the step output change function block output ----Enabling the control signal Vsam to be "1" level is one of the prerequisites for updating the output of the instantaneous low-pass filter output signal extraction function block when the sampling pulse Ft arrives (another prerequisite is that there is a sampling pulse Ft , That is, above-mentioned 2 preconditions must possess simultaneously and could make instantaneous low-pass filtering output signal extract function block output update); The minimum output quantity judgment function block constantly monitors the output Vb of the step output quantity change function block; When the step output When the output Vb of the quantity changes function block is less than the minimum threshold in the minimum output determination function block (this "minimum threshold" is set in the minimum output determination function block), the minimum output determination function block outputs "0" level; The minimum output judgment function block has a hysteresis function to ensure the determination of the output level VDr of the minimum output judgment function block.

As an improvement of the flicker-free control method of the anti-jitter phase control dimmer of the present invention:

Due to the operating characteristics of the jitter-free DC component processing functional circuit, the actual DC control value Vb output by the step output change function block is only when the gap between it and the output Va of the instantaneous low-pass filter output signal extraction function block exceeds a predetermined gap (preset fixed value), the stepping output changes the output Vb of the functional block to refresh and refresh the actual output Vb to the output Va of the instantaneous low-pass filter output signal extraction function block with a predetermined step speed (predetermined slope); obviously As long as the difference between the output Va of the instantaneous low-pass filter output signal extraction function block and the step output change function block output Vb is less than the predetermined gap (predetermined set value), although the output value of the low-pass filter output signal extraction function block Va has a change, and the output Vb of the step output change function block remains unchanged; this can ensure that the step output change function block output Vb can effectively suppress the asymmetry of the components in the internal control circuit of the phase control dimmer Some jitter due to characteristics.

As a further improvement of the flicker-free control method of the anti-jitter phase control dimmer of the present invention:

The extraction function block of the instantaneous low-pass filter output signal includes a logic AND gate, a monostable flip-flop and a sample-and-hold device;

The output of the sampling pulse Ft and the enabling control signal Vsam after the logical processing of the logic AND gate generates a sampling enable signal, and the sampling enabling signal generates a sampling pulse (10us pulse width) through a monostable trigger, and the sampling pulse controls the sampling and holding The device samples; the sample-and-hold device samples the output voltage Vin of the low-pass filter so that the output voltage is Va.

Remarks: The sample-and-hold device can be an analog circuit, or an analog + digital circuit, which is a conventional technology.

As a further improvement of the flicker-free control method of the anti-jitter phase control dimmer of the present invention:

The incremental size determination function block is a window comparator, including a resistor divider network, a three-resistor divider network, a comparator, and an output resistor;

The output voltage Va of the instantaneous low-pass filter output signal extraction function block is divided by the voltage divider resistor network to obtain Vaa; the output voltage Vb of the step output change function block is obtained by the three-resistor voltage divider network to obtain two window voltages V _CH and V _CL , the above two window voltages V _CH and V _CL are compared with Vaa in their corresponding comparators. The outputs generated by the two comparators are combined by a diode and then enter the output resistor. The voltage on the output resistor is the window The output voltage Vo of the comparator; when the value of Vaa is between two window voltages V _CH and V _CL , the output voltage Vo of the incremental size judgment function block is "0"; otherwise, the output of the incremental size judgment function block The voltage Vo is "1".

Remarks: The difference between the two window voltages VCH and VCL is the "predetermined set value" set in the increment size judgment function block.

As a further improvement of the flicker-free control method of the anti-jitter phase control dimmer of the present invention:

The step output variable change function block includes positive and negative increment determiner (for: comparator), status register (for: R-S flip-flop), add-subtract counter, digital-to-analog converter, step pulse source Fs and window comparator ( 35);

Remarks: the step output change function block also includes a logic inverter; the window comparator is the same as the window comparator described in the increment size determination function block;

Divided into the following two situations:

Case 1: When the output voltage Vo of the incremental size determination function block is "1", when the state register is set to "1", the logic AND gate is opened; at the same time, Vsam is set to "0" level; this makes the instantaneous low The output of the filter output signal extraction function block maintains the original value;

Case 2: When the output voltage Vo of the incremental size determination function block is "0", the state register maintains the original state "0"; the step output change operation is not performed; the output voltage Vb of the step output change function block maintains constant.

As a further improvement of the flicker-free control method of the anti-jitter phase control dimmer of the present invention:

The minimum output judgment function block is a comparator with hysteresis; two resistors are connected in series with the comparator to form a comparator with hysteresis; the hysteresis is determined by the ratio of the resistance values of the above two resistors; the minimum threshold is determined by Vmin decision;

When the Vb value is less than Vmin (that is, the minimum threshold), the output VDr of the comparator is "0" level;

When the Vb value is greater than Vmin+hysteresis voltage, the output VDr of the comparator is "1" level.

The technology of the present invention is based on shaping the conduction angle output by the phase control dimmer into a corresponding pulse width PWM waveform, and extracting the corresponding low-pass filtered DC component Vin of the pulse width PWM waveform, and increasing the corresponding no The jittering DC component processing function circuit is used to effectively extract the jitter-free DC component corresponding to the output of the phase control dimmer.

Description of drawings

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the schematic diagram of the instantaneous low-pass filter output signal extraction function block 1 in Fig. 1;;

Vin is the output voltage of the low-pass filter, Va is the output voltage, Ft is the sampling pulse, and Vsam is the enable control signal;

Fig. 3 is the schematic diagram of the increment size judging function block 2 among Fig. 1;

Va and Vb are two comparison signal voltages, and Vo is a comparator output start signal;

Fig. 4 is the implementation circuit diagram of the step output variable function block 3 among Fig. 1;

Fig. 5 is the schematic diagram of the minimum output judging function block 4 among Fig. 1;

Vb and Vmin are compared with the return difference, and the output VDr controls whether the system has an output.

detailed description

Embodiment 1,

A jitter-free DC component processing function circuit as shown in Figure 1 is set between the output voltage of the low-pass filter and the current control signal in the LED drive power supply. The jitter-free DC component processing function circuit includes the following functional blocks: instantaneous low-pass Filter output signal extraction function block 1, increment size judgment function block 2, step output change function block 3 and minimum output judgment function block 4. The instantaneous low-pass filter output signal extraction function block 1, the incremental size judgment function block 2, the step output change function block 3 and the minimum output judgment function block 4 are sequentially connected by signals. And with signal feedback between corresponding modules.

Instantaneous low-pass filter output signal extraction function block 1 pairs of low-pass filter output voltage Vin under its (instantaneous low-pass filter output signal extraction function block 1) enabling signal Vsam is "1" level condition, at the sampling pulse Ft Extraction and sampling are carried out at the specified time; in the incremental size judgment function block 2, the output Va of the instantaneous low-pass filter output signal extraction function block 1 and the output Vb (for the output Vb of the actual current jitter-free DC component processing function circuit) are carried out Difference compares, promptly judges increment size; If this increment is greater than predetermined setting value (this " preset setting value " is set in increment size judging function block 2), increment size judging function block 2 outputs start control signal Vo is "1" level, thereby starting the step output change function block 3 to perform step refresh on the output Vb of the actual current jitter-free DC component processing function circuit; if the increment is less than the predetermined set value, the increment size is judged The function block 2 outputs the start control signal Vo as "0" level, and does not need to start the step output change function block 3 to maintain the actual current output Vb of the jitter-free DC component processing function circuit. When the incremental size judgment function block 2 outputs the start control signal Vo to be "1" level to start the step output change function block 3, the step output change function block 3 according to this increment (that is, the difference between Va and Vb value) will change the increase or decrease of the actual output step (for the output of the step output change function block 3), and the slope of its increase and decrease is according to the predetermined slope (in the step output change This "predetermined slope" is set in the function block 3) changes; when this actual output Vb step refreshes and finally reaches the difference with the instantaneous low-pass filter output signal extraction function block 1 output Va, it is less than the predetermined error value (in step When the "predetermined error value" is set in the output volume change function block 3), the step output volume change operation ends; during the step output volume change operation process, the step output volume change function block 3 outputs---- The enable control signal Vsam is at "0" level so that the output of the instantaneous low-pass filter output signal extraction function block 1 remains unchanged. Instantaneous low-pass filter output signal extraction function block 1 output Va only after the step output change operation is completed, the step output change function block 3 output----enable control signal Vsam is "1" level is in When the sampling pulse Ft arrives, it will make the instantaneous low-pass filter output signal extract one of the prerequisites for the output update of the functional block 1 (the other prerequisite is that there is the sampling pulse Ft, that is, the above two prerequisites must be met simultaneously to make the instantaneous low-pass Filtered output signal extraction function block 1 output update). The minimum output quantity judgment function block 4 constantly monitors the output Vb of the step output quantity changing function block 3; When the "minimum threshold value" is set in the volume judgment function block 4), the minimum output volume judgment function block 4 outputs a "0" level. The minimum output judging function block 4 has a hysteresis function to ensure that the output level VDr of the minimum output judging function block 4 is determined.

Due to the operating characteristics of the jitter-free DC component processing functional circuit, the actual DC control value Vb output by the step output change function block 3 is only when the difference between it and the output Va of the instantaneous low-pass filter output signal extraction function block 1 exceeds a predetermined gap ( Predetermined setting value), the step output change function block 3 output Vb will be refreshed and the actual output Vb will be refreshed to the output of the instantaneous low-pass filter output signal extraction function block 1 at a predetermined step speed (predetermined slope) Amount Va; obviously as long as the difference between the output Va of the instantaneous low-pass filter output signal extraction function block 1 and the step output change function block 3 output Vb is less than the predetermined gap (predetermined set value), although the low-pass filter output signal The output Va of the extraction function block 1 changes, and the output Vb of the step output change function block 3 remains unchanged; this can ensure that the output Vb of the step output change function block 3 can effectively suppress the output due to the phase control dimmer Some jitter generated by the asymmetrical characteristics of the components in the internal control circuit.

The implementation circuit structure of the instantaneous low-pass filter output signal extraction function block 1 can be composed of a sample-and-hold circuit and an additional circuit, as shown in FIG. 2 .

In Figure 2, Vin is the output voltage of the low-pass filter, Va is the output voltage used, Ft is the sampling pulse, and Vsam is the enable control signal;

The output of the sampling pulse Ft and the enabling control signal Vsam after the logical processing of the logic AND gate 11 generates a sampling enabling signal, and the sampling enabling signal generates a sampling pulse with a pulse width of 10us through the monostable trigger 12, and the sampling pulse controls sampling Holder 13 performs sampling. The sample-and-hold unit 13 samples the output voltage Vin of the low-pass filter as Va.

The sample-and-hold device 13 can be an analog circuit, or an analog+digital circuit, which is conventional technology.

Increment size judgment function block 2 is a window comparator, and the composition of the window comparator is shown in Figure 3. The output of the instantaneous low-pass filter output signal extraction function block 1 is Va, and the output of the step output change function block 3 is Vb.

Figure 3Va and Vb are two comparison signal voltages, Vo is the comparator output start signal;

Specifically:

The output voltage Va of the instantaneous low-pass filter output signal extraction function block 1 is divided by the voltage dividing resistor network to obtain Vaa;

The stepping output changes the output voltage Vb of the functional block 3 through a 3-resistor voltage divider network to obtain two window voltages V _CH and V _CL , and the above two window voltages are compared with Vaa in their respective comparators, and the two comparators The generated output enters the output resistor after being merged by a diode, and the voltage on the output resistor is the output voltage Vo of the window comparator. When the value of Vaa is between the two window voltages V _CH and V _CL , the output voltage Vo of the incremental judgment function block 2 is 0; otherwise, the output voltage Vo of the incremental judgment functional block 2 is 1. The difference between the two window voltages VCH and VCL is the "predetermined set value" set in the increment judgment function block 2 .

The implementation circuit of the step output change function block 3 is shown in Fig. 4 . It consists of a positive and negative increment determiner 31 (comparator), a state register 32 (R-S flip-flop), an addition and subtraction counter 33, a digital-to-analog converter 34, a stepping pulse source Fs and a window comparator 35. The window comparator 35 is the same as the window comparator described in the increment size judging function block 2 .

details as follows:

Divided into the following two situations:

1. When the output voltage Vo of the incremental size determination function block 2 is "1", when the status register 32 (R-S flip-flop) is set to "1", the logic AND gate is opened; simultaneously Vsam is set to "0" level; this makes the output of the instantaneous low-pass filter output signal extraction function block 1 maintain the original value.

The stepping output changes the output voltage Vb of the functional block 3 through the voltage divider resistor network to obtain _Vbb ; in the positive and negative increment determiner 31, Vbb is compared with Vaa, and when Vaa is greater than Vbb, the addition and subtraction counter 33 is carried out Addition counting; when Vaa is less than Vbb, the addition and subtraction counter 33 is made to perform subtraction counting; the stepping pulse source Fs performs addition and subtraction step counting on the addition and subtraction counter 33 through a logic AND gate. The frequency of the step pulse source Fs determines the "predetermined slope" set in the step output change function block 3 . The digital quantity of the addition and subtraction counter 33 is output analog voltage Vb by the digital-to-analog converter 34 , and the output analog voltage Vb is compared with the output voltage Va of the instantaneous low-pass filter output signal extraction function block 1 in the window comparator 35 . When the difference between the output voltage Va of the instantaneous low-pass filter output signal extraction function block 1 and the output analog voltage Vb is less than the "predetermined error value" of the window comparator 35, the window comparator 35 outputs "0"; The phaser 36 outputs "1"level; the "1" level makes the status register 32 (RS flip-flop) set to "0", and the status register 32 (RS flip-flop) output Vsam is "1"level; This step output amount changing operation ends.

2. When the output voltage Vo of the incremental judgment function block 2 is "0", the state register 32 (R-S flip-flop) maintains the original state "0". Do not change the step output value. The output voltage Vb of the step output change function block 3 remains unchanged.

The output enable control signal Vsam is used to control whether the instantaneous low-pass filter output signal extraction function block 1 implements the adopting function; the enable control signal Vsam="0" stops the instantaneous low-pass filter output signal extraction function block 1 function and keeps the original sampling value Va. The output of the step output change function block 3 is Vb. The output of the instantaneous low-pass filter output signal extraction function block 1 is Va. The stepping speed is determined by the frequency of the stepping pulse source Fs. Wherein the window comparator 35 is used for judging whether the output Vb of the stepping output change function block 3 has been refreshed to the output Va of the instantaneous low-pass filter output signal extraction function block 1 . When judging that the output Vb of the step output change function block 3 has been refreshed to the instantaneous low-pass filter output signal extraction function block 1 output Va, the refresh operation of the step output change function block 3 is terminated and the enabling control signal Vsam is The "1" level turns on the sampling and holding function of the instantaneous low-pass filter output signal extraction function block 1.

The minimum output judging function block 4 is composed of a comparator with a return difference as shown in Figure 5 .

Figure 5 Vb and Vmin bring back difference comparison, the output VDr controls whether the system has output.

Specifically:

The two resistors are connected in series with the comparator to form a comparator with hysteresis; the magnitude of the hysteresis is determined by the ratio of the resistance values of the above two resistors. The minimum threshold is determined by Vmin.

When the Vb value is less than Vmin (that is, the minimum threshold), the output VDr of the comparator is "0" level;

When the Vb value is greater than Vmin+hysteresis voltage, the output VDr of the comparator is "1" level.

Finally, it should be noted that the above examples are only some specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention should be considered as the protection scope of the present invention.

Claims (5)

1. using the anti-jitter phase-controlled dimmer of controller progress without frequent flashing control method, it is characterized in that：

Set between current controling signal in the output voltage and LED drive power of LPF at non-jitter DC component Functional circuit is managed, the non-jitter DC component treatment functional circuit includes following functional block：Instantaneous LPF output signal Abstraction function block (1), increment size determine the function block (2), stepping output quantity change functional block (3) and minimum output quantity judges work( Can block (4)；The instantaneous LPF output signal abstraction function block (1), increment size determine the function block (2), stepping output Amount changes functional block (3) and is connected with minimum output quantity determine the function block (4) successively signal；

Instantaneous LPF output signal abstraction function block (1) is to low pass filter output voltage Vin in its enable signal Vsam Under the conditions of level"1", extracted and sampled at the sampling pulse Ft regulation moment；In increment size determine the function block (2) The middle output Va by instantaneous LPF output signal abstraction function block (1) carries out difference comparsion with output Vb, that is, judges increment Size；If this increment is more than predetermined set value, it is " 1 " electricity that increment size determine the function block (2) output, which starts control signal Vo, It is flat, change output of the functional block (3) by actual current non-jitter DC component treatment functional circuit so as to start stepping output quantity Vb carries out stepping refreshing；If increment is less than predetermined set value, increment size determine the function block (2) output starts control signal Vo For level "0", it is not necessary to start stepping output quantity and change functional block (3) and maintain actual current non-jitter DC component treatment work( The output Vb of energy circuit；

Start control signal Vo when increment size determine the function block (2) exports as level"1" startup stepping output quantity change function During block (3), stepping output quantity changes functional block (3) according to the positive and negative of this increment, by change reality output amount stepping increase or Reduce, and the slope of its increase and reduction is by predetermined slope variation；Finally reached when this reality output amount Vb steppings refresh To when being less than with instantaneous LPF output signal abstraction function block (1) output quantity Va difference in predictive error value, stepping is defeated Output changes operation and terminated；In this stepping output quantity changes operating process, stepping output quantity changes making for functional block (3) output Energy control signal Vsam is that level "0" causes instantaneous LPF output signal abstraction function block (1) output quantity to keep constant；Wink When LPF output signal abstraction function block (1) output quantity Va；Only after stepping output quantity, which changes operation, to be terminated, stepping The enabled control signal Vsam that output quantity changes functional block (3) output is that level"1" is to make wink when sampling pulse Ft arrives When LPF output signal abstraction function block (1) output renewal one of precondition；Minimum output quantity determine the function block (4) Constantly monitor the output Vb that stepping output quantity changes functional block (3)；The output Vb for changing functional block (3) when stepping output quantity is small In minimum output quantity determine the function block (4) during minimum threshold values, minimum output quantity determine the function block (4) exports level "0"；It is minimum Output quantity determine the function block (4) carries return difference function to ensure minimum output quantity determine the function block (4) output level VDr really It is fixed.

2. anti-jitter phase-controlled dimmer according to claim 1 is without frequent flashing control method, it is characterized in that：

The instantaneous LPF output signal abstraction function block (1) includes logical AND gate (11), monostable trigger (12) and adopted Sample retainer (13)；

It is enabled that the output of sampling pulse Ft and enabled control signal Vsam after the logical process of logical AND gate (11) produces sampling Signal, the sampling enable signal produce sampling pulse, sampling pulse control sampling holder (13) through monostable trigger (12) Sampled；Sampling holder (13) is to low pass filter output voltage Vin samplings so as to which output voltage is Va.

3. anti-jitter phase-controlled dimmer according to claim 2 is without frequent flashing control method, it is characterized in that：

Increment size determine the function block (2) is window comparator, including resistance pressure-dividing network, three resistance pressure-dividing networks, comparator, Output resistance；

The output voltage Va of instantaneous LPF output signal abstraction function block (1) obtains Vaa through resistor voltage divider network partial pressure； Stepping output quantity changes the output voltage Vb of functional block (3) through three resistance pressure-dividing networks, obtains two window-voltage V_CHAnd V_CL, on State 2 window-voltage V_CHAnd V_CLIn each self-corresponding comparator compared with Vaa, output caused by 2 comparators is respectively hung oneself Cross after 1 diode merges and enter output resistance, the voltage on output resistance is the output voltage Vo of window comparator；Work as Vaa Value in two window-voltage V_CHAnd V_CLBetween when, the output voltage Vo of increment size determine the function block (2) is " 0 "；Conversely, increase The output voltage Vo for measuring size determine the function block (2) is " 1 ".

4. anti-jitter phase-controlled dimmer according to claim 3 is without frequent flashing control method, it is characterized in that：

Stepping output quantity, which changes functional block (3), includes positive negative increment determinant (31), status register (32), forward-backward counter (33), digital-to-analog converter (34), step-by-step impulse source Fs and window comparator (35)；

It is divided into the following two kinds situation：

When situation one, the output voltage Vo of increment size determine the function block (2) are " 1 ", status register (32) set is " 1 " When, logical AND gate (11) is opened；Simultaneously by Vsam set level "0"s；This causes instantaneous LPF output signal extraction work( The output of energy block (1) maintains initial value；

When situation two, the output voltage Vo of increment size determine the function block (2) are " 0 ", status register (32) is remained stationary state “0”；Operated without the change of stepping output quantity；The output voltage Vb that stepping output quantity changes functional block (3) remains unchanged.

5. anti-jitter phase-controlled dimmer according to claim 4 is without frequent flashing control method, it is characterized in that：

Minimum output quantity determine the function block (4) is the comparator with return difference；It is connected after two resistant series with comparator and forms band The comparator of return difference；Return difference size is determined by the ratio between resistance of above-mentioned 2 resistance；Minimum threshold values is determined by Vmin；

When Vb values are less than Vmin, the output VDr of comparator is level "0"；

When Vb values are more than Vmin+ hysteresis voltages, the output VDr of comparator is level"1".