CN111385934A - Silicon controlled rectifier Bleeder circuit of adjusting luminance - Google Patents
Silicon controlled rectifier Bleeder circuit of adjusting luminance Download PDFInfo
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- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 29
- 239000010703 silicon Substances 0.000 title claims abstract description 29
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- 230000000670 limiting effect Effects 0.000 description 4
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- 230000008859 change Effects 0.000 description 2
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Abstract
The invention discloses a silicon controlled rectifier dimming Bleder circuit, which comprises a rectifying circuit, a filter circuit, a Bleder circuit and a dimming control circuit, wherein the dimming control circuit comprises a driver U31 and a peripheral control circuit electrically connected with pins of a driver U31, the input end of the rectifying circuit is electrically connected with a power supply, the output end of the rectifying circuit is electrically connected with the input end of a recording and broadcasting circuit, the output end of the filter circuit is electrically connected with the input end of the Bleder circuit, and the output end of the Bleder circuit is electrically connected with a pin 5 of a driver U31; and a positive output terminal X + of the peripheral control circuit is electrically connected with the positive end of the LED lamp string, and a positive output terminal X-of the peripheral control circuit is electrically connected with the negative end of the LED lamp string. According to the scheme, the dimming depth can be increased by adding the Bleeder circuit on the silicon controlled dimming scheme circuit, so that flickering is avoided, and the dimming effect is improved.
Description
Technical Field
The invention relates to the technical field of LED dimming, in particular to a silicon controlled dimming Bleeder circuit.
Background
LED dimming is an important part of utilizing light nowadays, and people have not satisfied that the light is only used for illumination for a long time. Through dimming of the LED, the light can generate multiple functions, such as color change, for example, a more comfortable environment is created, such as brightness of the light is adjusted, unnecessary electric light is reduced, and the purpose of energy conservation and emission reduction is further achieved, the functions can be achieved through dimming, most of LED dimming is achieved through controlling a power supply, and the LED dimming method mainly comprises three steps: the first is a PWM dimming power supply; the second is LED 0/1-10V dimming power supply; the third is LED silicon controlled rectifier dimming power supply.
Thyristor dimming is a physical dimming in which the input voltage is chopped starting from the ac phase 0 and no voltage is input until the thyristor is on. The principle is that the conduction angle of each half-wave of alternating current is adjusted to change a sine waveform, so that the effective value of the alternating current is changed, and the aim of dimming is fulfilled; the silicon controlled dimmer used on the LED illuminating lamp has the advantages that: the dimming cost is low, the disadvantage is that the dimming performance of the silicon controlled rectifier is poor, the dimming range is usually reduced, because the property of the silicon controlled rectifier semi-controlled switch only has the function of starting current but can not completely cut off the current, even if the dimming is carried out to the lowest, weak current still passes through, and the characteristic of micro-current light emission of the LED is realized, so that the phenomenon that the LED still has weak light emission after being cut off exists in a large amount by using the silicon controlled rectifier dimming, and the difficulty of popularization of the current LED dimming mode is formed; the silicon controlled dimming scheme in the current market has the defects of poor compatibility, poor dimming effect, insufficient dimming depth and the like.
At present, many silicon controlled rectifier dimming schemes have the defects of poor compatibility, poor dimming effect, insufficient dimming depth and the like. This scheme is through increasing a Bleeder circuit on silicon controlled rectifier dimming scheme circuit, provides the holding current of silicon controlled rectifier light modulator, guarantees that the light modulator keeps the correct opening at whole dimming in-process to increase the degree of depth of adjusting luminance, avoid the scintillation, improve and transfer the effect.
Disclosure of Invention
The invention aims to overcome the defects of poor compatibility, poor dimming effect, insufficient dimming depth and the like of a silicon controlled dimming scheme in the market, and provides a silicon controlled dimming Bleder circuit.
In order to achieve the technical purpose, the invention provides a technical scheme that a silicon controlled dimming Bleder circuit comprises a rectifying circuit, a filtering circuit, a Bleder circuit and a dimming control circuit, wherein the dimming control circuit comprises a driver U31 and a peripheral control circuit electrically connected with pins of a driver U31, the input end of the rectifying circuit is electrically connected with a power supply, the output end of the rectifying circuit is electrically connected with the input end of a recording and broadcasting circuit, the output end of the filtering circuit is electrically connected with the input end of the Bleder circuit, and the output end of the Bleder circuit is electrically connected with a pin 5 of a driver U31; and a positive output terminal X + of the peripheral control circuit is electrically connected with the positive end of the LED lamp string, and a positive output terminal X-of the peripheral control circuit is electrically connected with the negative end of the LED lamp string.
In this scheme, the power connects the silicon controlled rectifier Bleeder circuit of adjusting luminance, obtains drive silicon controlled rectifier Q1's driving voltage through the rectification filtering, and the silicon controlled rectifier switches on and obtains the holding current of Bleeder circuit, and holding current maintains switching on of silicon controlled rectifier Q1, guarantees that the light modulator keeps opening correctly at whole dimming in-process to increase the degree of depth of adjusting luminance, avoid the scintillation, improve and transfer the effect.
The first input end of the rectifying circuit is electrically connected with the positive electrode L end of the power supply through a fuse F11, the second input end of the rectifying circuit is electrically connected with the negative electrode N end of the power supply, the first output end of the rectifying circuit is electrically connected with the input end of the filter circuit, and the second output end of the rectifying circuit is grounded.
In the scheme, the fuse F11 is a safety resistor, has a limiting effect on peak current, can limit the peak value of input current, is favorable for reducing the noise of the inductor L21, and increases the carrying quantity of the light modulator.
The filter circuit comprises an inductor L21, a first end of an inductor L21 is electrically connected with a first output end of the rectifier circuit, a second end of an inductor L21 is electrically connected with a second end of a resistor RS21A, a first end of the resistor RS21A is electrically connected with a first end of an inductor L21, a second end of a resistor RS21A is electrically connected with a first end of a capacitor C22, a second end of the capacitor C22 is electrically connected with a second end of a capacitor C21, a first end of the capacitor C21 is electrically connected with a first end of a resistor RS21A, and a second end of the capacitor C21 is electrically connected with a second output end of the rectifier circuit.
The Bleeder circuit comprises a capacitor C7, a first end of a capacitor C7 is electrically connected with a second end of an inductor L21, a second end of the capacitor C7 is electrically connected with a first end of a resistor R13, a second end of a resistor R13 is grounded, a first end of a resistor R13 is electrically connected with a first end of a resistor R15, a second end of a resistor R15 is electrically connected with a first end of a capacitor C6, a second end of a capacitor C6 is electrically connected with a second end of a resistor R13, a first end of a capacitor C6 is electrically connected with a gate terminal of a thyristor Q1, an element terminal of the thyristor Q1 is electrically connected with a first end of a resistor R14, a second end of a resistor R14 is electrically connected with a second end of a capacitor C6d, a first end of a thyristor Q1 is electrically connected with a second end of a resistor RS A, a first end of a resistor RS12 RS A is electrically connected with a second end of a resistor RS12, and a first.
The peripheral control circuit comprises a resistor RS61A, a first end of the resistor RS61 is electrically connected with a pin 5 of a driver U31, a second end of a resistor RS61 is electrically connected with a first end of a resistor RS61B, a second end of a resistor RS61B is electrically connected with a pin 2 of a driver U31, a pin 2 of the driver U31 is electrically connected with a first end of a resistor RS62, a second end of a resistor RS62 is electrically connected with a second end of a capacitor CS62, a first end of a capacitor CS62 is electrically connected with a first end of a capacitor CS61, a second end of a capacitor CS61 is electrically connected with a first end of a resistor RS62, a second end of a resistor RS62 is electrically connected with a first end of a diode DS41, an anode end of a diode DS41 is electrically connected with a positive end of a capacitor CD41, a cathode end of a capacitor CD41 is used as a cathode end of the LED light string, a cathode end of a capacitor CD41 is electrically connected with an anode end of a diode DS42, a cathode end of the diode DS42 is electrically connected with a first end of an inductor, the second end of the resistor RS34 is electrically connected with the positive terminal of the capacitor CD41, the first end of the inductor L41 is electrically connected with the second end of the resistor RS41B, the first end of the resistor RS41B is respectively electrically connected with the first end of the resistor RS41A and the pin 4 of the resistor driver U31, the second end of the resistor RS41A is electrically connected with the second end of the resistor RS41B, the pin 5 of the driver U31 is communicated with the pin 6 of the driver U31, the pin 4 of the driver U31 is communicated with the pin 1 of the driver U31, the second end of the resistor RS41A is electrically connected with the pin 8 of the driver U31, and the pin 8 of the driver U31 is electrically connected with the first end of the capacitor CS61 and grounded.
In the scheme, the driver U31 adjusts the output current of the LED according to the phase-cut angle of the silicon controlled rectifier.
The peripheral control circuit further comprises a resistor RS42, the first end of the resistor RS42 is electrically connected with the negative end of the LED lamp string, and the second end of the resistor RS42 is electrically connected with the positive end of the LED lamp string.
The driver U31 is an MP4088LED driver. In the scheme, the MP4088LED driver has the advantages of high starting speed, low time delay and no flicker when the ambient temperature is high due to power derating at high temperature.
The controllable silicon Q1 is an enhanced field effect transistor of E47N50F type. In the scheme, the E47N50F type enhanced field effect transistor has the advantages of high input resistance, low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown phenomenon, wide safe working area and the like
The invention has the beneficial effects that: according to the silicon controlled dimming Bleder circuit, the Bleder circuit is added on the circuit of the silicon controlled dimming scheme to provide the maintaining current of the silicon controlled dimming dimmer and ensure that the dimmer keeps correct opening in the whole dimming process, so that the dimming depth is increased, the flicker is avoided, and the dimming effect is improved.
Drawings
Fig. 1 is a schematic diagram of a thyristor dimming Bleeder circuit according to the present invention.
Fig. 2 is a voltage waveform diagram of two ends of a capacitor C22 of the scr dimming Bleeder circuit of the present invention.
Fig. 3 is a voltage waveform diagram across resistor R13 of a scr dimming Bleeder circuit of the present invention.
Fig. 4 is a voltage waveform diagram across resistor RS12 of a scr dimming Bleeder circuit of the present invention.
The notation in the figure is: the dimming circuit comprises a rectifier circuit 1, a filter circuit 2, a Bleeder circuit 3 and a dimming control circuit 4.
Detailed Description
For the purpose of better understanding the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention with reference to the accompanying drawings and examples should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and not for limiting the scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the scope of the present invention.
Example (b): as shown in fig. 1, a schematic diagram of a thyristor dimming Bleeder circuit 3 is composed of a rectifying circuit 1, a filter circuit 2, a Bleeder circuit 3 and a dimming control circuit 4, the dimming control circuit 4 is composed of a driver U31 and a peripheral control circuit electrically connected with each pin of a driver U31, the driver U31 is an MP4088LED driver, the MP4088LED driver has the advantages of high starting speed, low delay, and no flicker when the ambient temperature is high due to power derating at high temperature. The input end of the rectifying circuit 1 is electrically connected with a power supply, the output end of the rectifying circuit 1 is electrically connected with the input end of the recording and broadcasting circuit, the output end of the filter circuit 2 is electrically connected with the input end of the Bleeder circuit 3, and the output end of the Bleeder circuit 3 is electrically connected with a pin 5 of a driver U31; and a positive output terminal X + of the peripheral control circuit is electrically connected with the positive end of the LED lamp string, and a positive output terminal X-of the peripheral control circuit is electrically connected with the negative end of the LED lamp string.
In this embodiment, the power supply is connected to the thyristor dimming Bleeder circuit 3, the driving voltage for driving the thyristor Q1 is obtained after rectification and filtering, the thyristor is conducted to obtain the holding current of the Bleeder circuit 3, and the holding current maintains the conduction of the thyristor Q1, so that the dimmer is ensured to be kept correctly turned on in the whole dimming process, thereby increasing the dimming depth, avoiding flicker, and improving the dimming effect.
The first input end of the rectifying circuit 1 is electrically connected with the positive electrode L end of the power supply through a fuse F11, the second input end of the rectifying circuit 1 is electrically connected with the negative electrode N end of the power supply, the first output end of the rectifying circuit 1 is electrically connected with the input end of the filter circuit 2, and the second output end of the rectifying circuit 1 is grounded.
In this embodiment, the fuse F11 is a safety resistor, which has a limiting effect on the peak current, and can limit the peak value of the input current, thereby being beneficial to reducing the noise of the inductor L21 and increasing the number of loads carried by the dimmer.
The filter circuit 2 comprises an inductor L21, a first end of the inductor L21 is electrically connected with a first output end of the rectifier circuit 1, a second end of the inductor L21 is electrically connected with a second end of a resistor RS21A, a first end of the resistor RS21A is electrically connected with a first end of an inductor L21, a second end of the resistor RS21A is electrically connected with a first end of a capacitor C22, a second end of the capacitor C22 is electrically connected with a second end of a capacitor C21, a first end of the capacitor C21 is electrically connected with a first end of a resistor RS21A, and a second end of the capacitor C21 is electrically connected with a second output end of the rectifier circuit 1.
The Bleeder circuit 3 includes a capacitor C7, a first terminal of the capacitor C7 is electrically connected to a second terminal of the inductor L21, a second terminal of the capacitor C7 is electrically connected to a first terminal of the resistor R13, a second terminal of the resistor R13 is grounded, a first terminal of the resistor R13 is electrically connected to a first terminal of the resistor R15, a second terminal of the resistor R15 is electrically connected to a first terminal of the capacitor C6, a second terminal of the capacitor C6 is electrically connected to a second terminal of the resistor R13, a first terminal of the capacitor C6 is electrically connected to a gate terminal of the thyristor Q1, an element terminal of the thyristor Q1 is electrically connected to a first terminal of the resistor R14, a second terminal of the resistor R14 is electrically connected to a second terminal of the capacitor C6d, a drain terminal of the thyristor Q1 is electrically connected to a second terminal of the resistor RS12A, a first terminal of the resistor RS12A is electrically connected to a second terminal of the resistor RS12, and.
In this embodiment, the thyristor Q1 in the Bleeder circuit 3 is connected in series to the positive terminal of the input, and after the thyristor is triggered and turned on each time, a certain holding current is needed to maintain the conduction; the voltage shown in fig. 2 is obtained through an EMI filter circuit 2 composed of a capacitor C21, an inductor L21, a resistor RS21A, and a capacitor C22; that is, the input voltage of the Bleeder circuit 3 is obtained, the capacitor C7 is charged, the resistor R13 is used for limiting current to obtain the voltage shown in fig. 3, the current is limited through the resistor R15, the driving voltage of the thyristor Q1 is obtained after filtering through the capacitor C6, the maintaining current of the Bleeder circuit 3 is obtained after the thyristor Q1 is conducted and then the current is limited through the resistor RS12, the resistor RS12A and the resistor RS14, the maintaining current can maintain the conduction of the thyristor Q1, and the maintaining current is shown in fig. 4; the controlled silicon Q1 is an enhanced field effect transistor of E47N50F type; the E47N50F model enhanced field effect transistor has the advantages of high input resistance, low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown phenomenon, wide safe working area and the like.
The peripheral control circuit comprises a resistor RS61A, a first end of the resistor RS61 is electrically connected with a pin 5 of a driver U31, a second end of a resistor RS61 is electrically connected with a first end of a resistor RS61B, a second end of the resistor RS61B is electrically connected with a pin 2 of a driver U31, a pin 2 of the driver U31 is electrically connected with a first end of a resistor RS62, a second end of a resistor RS62 is electrically connected with a second end of a capacitor CS62, a first end of a capacitor CS62 is electrically connected with a first end of a capacitor CS61, a second end of a capacitor CS61 is electrically connected with a first end of a resistor RS62, a second end of a resistor RS62 is electrically connected with a first end of a diode DS41, an anode end of a diode DS41 is electrically connected with a positive end of a capacitor CD41, a cathode end of a capacitor CD41 is used as a cathode end of the LED light string, a cathode end of a capacitor CD41 is electrically connected with an anode end of a diode DS42, a cathode end of the diode DS42 is electrically connected with a first end of an, the second end of the resistor RS34 is electrically connected with the positive terminal of the capacitor CD41, the first end of the inductor L41 is electrically connected with the second end of the resistor RS41B, the first end of the resistor RS41B is respectively electrically connected with the first end of the resistor RS41A and the pin 4 of the resistor driver U31, the second end of the resistor RS41A is electrically connected with the second end of the resistor RS41B, the pin 5 of the driver U31 is communicated with the pin 6 of the driver U31, the pin 4 of the driver U31 is communicated with the pin 1 of the driver U31, the second end of the resistor RS41A is electrically connected with the pin 8 of the driver U31, and the pin 8 of the driver U31 is electrically connected with the first end of the capacitor CS61 and grounded.
The above-mentioned embodiments are preferred embodiments of the scr dimming Bleeder circuit of the present invention, and the scope of the present invention is not limited thereto, and the present invention includes and is not limited thereto, and all equivalent changes in shape and structure according to the present invention are within the protection scope of the present invention.
Claims (8)
1. The utility model provides a silicon controlled rectifier Bleeder circuit that adjusts luminance which characterized in that: the dimming control circuit comprises a driver U31 and a peripheral control circuit electrically connected with pins of a driver U31, wherein the input end of the rectifying circuit is electrically connected with a power supply, the output end of the rectifying circuit is electrically connected with the input end of a recording and broadcasting circuit, the output end of the filtering circuit is electrically connected with the input end of the Bleeder circuit, and the output end of the Bleeder circuit is electrically connected with a pin 5 of the driver U31; and a positive output terminal X + of the peripheral control circuit is electrically connected with the positive end of the LED lamp string, and a positive output terminal X-of the peripheral control circuit is electrically connected with the negative end of the LED lamp string.
2. A thyristor dimmer circuit as defined in claim 1, wherein: the first input end of the rectifying circuit is electrically connected with the positive electrode L end of the power supply through a fuse F11, the second input end of the rectifying circuit is electrically connected with the negative electrode N end of the power supply, the first output end of the rectifying circuit is electrically connected with the input end of the filter circuit, and the second output end of the rectifying circuit is grounded.
3. A thyristor dimmer circuit as claimed in claim 2, wherein: the filter circuit comprises an inductor L21, a first end of an inductor L21 is electrically connected with a first output end of the rectifier circuit, a second end of an inductor L21 is electrically connected with a second end of a resistor RS21A, a first end of the resistor RS21A is electrically connected with a first end of an inductor L21, a second end of a resistor RS21A is electrically connected with a first end of a capacitor C22, a second end of the capacitor C22 is electrically connected with a second end of a capacitor C21, a first end of the capacitor C21 is electrically connected with a first end of a resistor RS21A, and a second end of the capacitor C21 is electrically connected with a second output end of the rectifier circuit.
4. A thyristor dimmer circuit as defined in claim 3, wherein: the Bleeder circuit comprises a capacitor C7, a first end of a capacitor C7 is electrically connected with a second end of an inductor L21, a second end of the capacitor C7 is electrically connected with a first end of a resistor R13, a second end of a resistor R13 is grounded, a first end of a resistor R13 is electrically connected with a first end of a resistor R15, a second end of a resistor R15 is electrically connected with a first end of a capacitor C6, a second end of a capacitor C6 is electrically connected with a second end of a resistor R13, a first end of a capacitor C6 is electrically connected with a gate terminal of a thyristor Q1, an element terminal of the thyristor Q1 is electrically connected with a first end of a resistor R14, a second end of a resistor R14 is electrically connected with a second end of a capacitor C6d, a first end of a thyristor Q1 is electrically connected with a second end of a resistor RS A, a first end of a resistor RS12 RS A is electrically connected with a second end of a resistor RS12, and a first.
5. A thyristor dimmer circuit as claimed in claim 4, wherein: the peripheral control circuit comprises a resistor RS61A, a first end of the resistor RS61 is electrically connected with a pin 5 of a driver U31, a second end of a resistor RS61 is electrically connected with a first end of a resistor RS61B, a second end of a resistor RS61B is electrically connected with a pin 2 of a driver U31, a pin 2 of the driver U31 is electrically connected with a first end of a resistor RS62, a second end of a resistor RS62 is electrically connected with a second end of a capacitor CS62, a first end of a capacitor CS62 is electrically connected with a first end of a capacitor CS61, a second end of a capacitor CS61 is electrically connected with a first end of a resistor RS62, a second end of a resistor RS62 is electrically connected with a first end of a diode DS41, an anode end of a diode DS41 is electrically connected with a positive end of a capacitor CD41, a cathode end of a capacitor CD41 is used as a cathode end of the LED light string, a cathode end of a capacitor CD41 is electrically connected with an anode end of a diode DS42, a cathode end of the diode DS42 is electrically connected with a first end of an inductor, the second end of the resistor RS34 is electrically connected with the positive terminal of the capacitor CD41, the first end of the inductor L41 is electrically connected with the second end of the resistor RS41B, the first end of the resistor RS41B is respectively electrically connected with the first end of the resistor RS41A and the pin 4 of the resistor driver U31, the second end of the resistor RS41A is electrically connected with the second end of the resistor RS41B, the pin 5 of the driver U31 is communicated with the pin 6 of the driver U31, the pin 4 of the driver U31 is communicated with the pin 1 of the driver U31, the second end of the resistor RS41A is electrically connected with the pin 8 of the driver U31, and the pin 8 of the driver U31 is electrically connected with the first end of the capacitor CS61 and grounded.
6. A thyristor dimmer circuit as claimed in claim 5, wherein: the peripheral control circuit further comprises a resistor RS42, the first end of the resistor RS42 is electrically connected with the negative end of the LED lamp string, and the second end of the resistor RS42 is electrically connected with the positive end of the LED lamp string.
7. A thyristor dimmer circuit as claimed in claim 1 or 5, wherein: the driver U31 is an MP4088LED driver.
8. A thyristor dimmer circuit as claimed in claim 4, wherein: the controllable silicon Q1 is an enhanced field effect transistor of E47N50F type.
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| CN201911369914.4A CN111385934B (en) | 2019-12-26 | 2019-12-26 | Silicon controlled rectifier Bleeder circuit of adjusting luminance |
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| CN201911369914.4A CN111385934B (en) | 2019-12-26 | 2019-12-26 | Silicon controlled rectifier Bleeder circuit of adjusting luminance |
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