CN217037515U

CN217037515U - Circuit for silicon controlled rectifier dimming

Info

Publication number: CN217037515U
Application number: CN202220504417.1U
Authority: CN
Inventors: 朱莉莉
Original assignee: Taizhou Jiaoguang Lighting Co ltd
Current assignee: Taizhou Jiaoguang Lighting Co ltd
Priority date: 2022-03-08
Filing date: 2022-03-08
Publication date: 2022-07-22
Anticipated expiration: 2032-03-08

Abstract

The utility model provides a circuit for silicon controlled rectifier dimming, and belongs to the technical field of electronics. It has solved the problem that current silicon controlled rectifier dimming technology has the scintillation. The circuit for silicon controlled rectifier dimming comprises a resistor R4, a resistor R1 and a resistor R6 which are connected with a driving module and a power module, the other end of the resistor R4 is respectively connected with a pin 2 and a resistor R5 of a first switching element Q1, a pin 1 of the first switching element Q1 is connected with the resistor R1, a pin 1 and a pin 3 of the first switching element Q1 are connected through the resistor R8, a pin 3 of the first switching element Q1 is connected with the driving module, a pin 1 of a second switching element Q1 is connected with a pin 2 of the first switching element Q1, a pin 2 of the second switching element Q2 is connected with a positive electrode of a resistor R6 and a positive electrode of a photosensitive diode D2, and a negative electrode of the photosensitive diode D2 and a pin 3 of the second switching element are all grounded. The utility model can eliminate the flicker problem of silicon controlled rectifier dimming under the condition of not reducing power factors.

Description

Circuit for silicon controlled rectifier dimming

Technical Field

The utility model belongs to the technical field of electronics, and relates to a circuit for silicon controlled rectifier dimming.

Background

An LED is a semiconductor device capable of directly converting electric energy into optical energy, and the LED is used as a light source more and more widely due to its advantages of small size, long service life, high luminous efficiency, no radiation, low power consumption, and the like. And with the improvement of the living quality requirements of people, more and more LED lamps are required to have a dimming function.

At present, the dimming function of the LED lamp is usually realized by adopting a thyristor dimming technology. The silicon controlled light modulation technology is characterized in that a silicon controlled light modulator is connected in series between commercial power and a light driving power supply, and the commercial power is subjected to phase cutting processing by the silicon controlled light modulator and then is output to the light driving power supply, so that a light emitting module is driven to work. However, the thyristor dimming technology is easy to generate stroboflash due to low compatibility, and in order to eliminate the stroboflash, an additional electrolytic capacitor is usually adopted, and the electrolytic capacitor is connected in parallel to the input end of the light driving power supply, so as to eliminate the stroboflash.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a circuit for silicon controlled rectifier dimming, which aims to solve the technical problems that: the flicker problem of the silicon controlled rectifier dimming is eliminated under the condition of not reducing the power factor.

The purpose of the utility model can be realized by the following technical scheme: a circuit for silicon controlled dimming comprises a power supply module, a driving module, a resistor R1, a resistor R8, a resistor R4, a resistor R5, a resistor R6, a photodiode D2, a first switching element Q1 and a second switching element Q2 which are connected with a mains supply, one end of the resistor R4, one end of the resistor R1, one end of the resistor R6 and the driving module are connected with the power supply module, the other end of the resistor R4 is respectively connected with a pin 2 of a first switching element Q1 and one end of a resistor R5, the other end of a resistor R5 is grounded, a pin 1 of the first switching element Q1 is connected with the other end of the resistor R1, a pin 1 and a pin 3 of the first switching element Q1 are connected through a resistor R6, a pin 3 of the first switching element Q1 is connected with the driving module, a pin 1 of the second switching element Q1 is connected with a pin 2 of a first switching element Q8, the other end of a pin 2 of a second switching element Q2 is connected with a positive pole 2 of a photodiode R2, the cathode of the photodiode D2 and the pin 3 of the second switching element are both grounded.

When the circuit is used, a power module of the circuit is connected with a mains supply and a silicon controlled dimmer, a driving module is connected with a load lamp bead, the power module supplies power to a first switch element Q1 through a resistor R4 and a resistor R5, the power module supplies power to a second switch element Q2 through a resistor R6, when the silicon controlled dimmer is dimmed to a high section, the load lamp bead is brighter, a photodiode D2 is conducted, the second switch element Q2 is not conducted at the moment, a pin 2 of the first switch element Q1 is in a high level, the first switch element Q1 is conducted, the driving module normally works, the load lamp bead realizes brightness adjustment according to the silicon controlled dimmer, when the silicon controlled dimmer is dimmed to a low section, the load lamp bead is darker, the photodiode D2 is in a large resistance value and is not conducted at the moment, a pin 2 of the second switch element Q2 is in a high level, the second switch element Q2 is conducted, a pin 2 of the first switch element Q1 is in a low level when the second switch element Q2 is conducted, first switch element Q1 ends, and drive module is because the current-limiting resistor of this great resistance of access resistor R8, and drive module stop work, and load lamp pearl is also closed thereupon, through the application of this circuit, has avoided load lamp pearl to appear the problem of scintillation when adjusting luminance to the low section, when the scintillation problem that the elimination silicon controlled rectifier was adjusted luminance and is existed, and can not cause the decline of power factor.

In the above-mentioned circuit for thyristor dimming, a resistor R7 is further connected in series between the resistor R6 and the 2-pin of the second switching element Q2. The resistor R7 and the resistor R6 are added together to the 2 nd pin of the second switching element Q2 as a dc voltage of the 2 nd pin of the switching element.

In the above-mentioned circuit for triac dimming, the first switching element Q1 and the second switching element Q2 both employ a triode. The base of the triode corresponds to pin 2, the collector of the triode corresponds to pin 1, and the emitter of the triode corresponds to pin 3.

In the circuit for thyristor dimming described above, MOS transistors are used for the first switching element Q1 and the second switching element Q2. When the MOS tube is adopted, the grid of the MOS tube corresponds to 2 pins, the source of the MOS tube corresponds to 1 pin, and the drain of the MOS tube corresponds to 3 pins.

In the above-mentioned circuit for silicon controlled rectifier dimming, the driving module includes a driving chip U1, a resistor RS1, a resistor RS2, a resistor R2, a resistor R3, and a diode D1, an anode of the diode D1 is connected to the power module, one end of the resistor R2 is connected to the power module, the other end of the resistor R2 is connected to a VIN pin of the driving chip U1, a cathode of the diode D1 is connected to an HV pin of the driving chip U1, a TRIAC pin of the driving chip U1 is connected to a pin 3 of the first switching element Q1, a CS1 pin of the driving chip U1 is sequentially connected in series to the resistor RS1 and the resistor RS2 and then grounded, a CS2 pin of the driving chip U1 is connected to a connection point of the resistor RS1 and the resistor RS2, a VD pin of the driving chip U1 is connected to the resistor R3, and an RTH pin of the driving chip U1 is grounded. When the LED dimming lamp is used, the load lamp bead is connected between the cathode of the diode D1 and the DRAIN pin of the driving chip U1, and is used for realizing brightness adjustment of the load lamp bead under the action of the driving chip U1 and the silicon controlled rectifier dimmer.

In the above-mentioned circuit for silicon controlled rectifier is adjusted luminance, the power module includes rectifier bridge B1, fuse F1, piezo-resistor RV1 and piezo-resistor RV2, the one end of piezo-resistor RV1 and the one end of fuse F1 are connected respectively to rectifier bridge B1's first input end, the other end and the live wire of alternating current of fuse F1 are connected, the other end and the zero line of alternating current of piezo-resistor RV1 are connected to rectifier bridge B1's second input end, the positive output end of rectifier bridge B1 is connected the one end of piezo-resistor RV2 and the positive pole of diode D1 in the drive module, rectifier bridge B1's negative output end and the other end of piezo-resistor RV2 are connected and ground connection. After external alternating current passes through rectifier bridge B1 rectification, can export and provide the required stable direct current of work for load lamp pearl and drive module. The fuse F1 is used for fusing when the current is too large, and other electric elements in the circuit are protected from being burnt out; the voltage dependent resistor RV1 can absorb surge voltage of an external alternating current access end, and the voltage dependent resistor RV2 can absorb surge voltage of a positive output end of the rectifier bridge B1, so that the reliability of direct current output is improved.

Compared with the prior art, this a circuit for silicon controlled rectifier adjusts luminance can realize the bright detection to load lamp pearl through photodiode D2, when load lamp pearl is darker, photodiode D2 presents the big resistance, second switch element Q2 switches on this moment, first switch element Q1 does not switch on, thereby make driver chip U1 automatic shutoff, the problem of scintillation appears when avoiding adjusting luminance to the low section, and the application of this circuit, when the scintillation problem that the solution silicon controlled rectifier was adjusted luminance and is existed, can not reduce power factor.

Drawings

Fig. 1 is a circuit schematic of the present invention.

In the figure, 1, a power supply module; 2. a drive module; 3. and (4) loading the lamp beads.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

as shown in fig. 1, the circuit for silicon controlled rectifier dimming includes a power module 1 and a driving module 2, wherein the power module 1 is connected with an ac power and a silicon controlled rectifier dimmer, and is used for converting ac power into dc power and adjusting the magnitude of current input to the circuit for silicon controlled rectifier dimming by the silicon controlled rectifier dimmer. The power module 1 comprises a rectifier bridge B1, a fuse F1, a varistor RV1 and a varistor RV2, the drive module 2 comprises a drive chip U1, a resistor RS1, a resistor RS2, a resistor R2, a resistor R3 and a diode D1, when the drive module is connected, a first input end of the rectifier bridge B1 is connected with one end of the varistor RV1 and one end of the fuse F1 respectively, an interface ACL is led out from the other end of the fuse F1 and used for being connected with a live wire of alternating current, a second input end of the rectifier bridge B1 is connected with the other end of the varistor RV1, an interface CAN is led out from a second input end of the rectifier bridge B1 and used for being connected with a zero line of alternating current, a positive output end of the rectifier bridge B1 is connected with one end of the varistor RV2 and a positive electrode of the diode D1 in the drive module 2, and a negative output end of the rectifier bridge B1 is connected with the other end of the varistor 2 and grounded. One end of a resistor R2 is connected with the positive output end of a rectifier bridge B1, the other end of the resistor R2 is connected with the VIN pin of a driving chip U1, the cathode of a diode D1 is connected with the HV pin of the driving chip U1 and the anode of a load lamp bead 3, the cathode of the load lamp bead 3 is connected with the DRAIN pin of the driving chip U1, the CS1 pin of the driving chip U1 is sequentially connected with a resistor RS1 and a resistor RS2 in series and then grounded, the CS2 pin of the driving chip U1 is connected with the connection point of a resistor RS1 and a resistor RS2, the VD pin and the DRAIN pin of the driving chip U1 are connected through a resistor R1, the RTH pin of the driving chip U1 is grounded, the TRIAC pin of the driving chip U1 is respectively connected with the pin 3 of a first switching element Q1 and one end of the resistor R1, the other end of the resistor R1 is connected with the pin 1 of the first switching element Q1 and one end of the resistor R1, the other end of the rectifying bridge B1, the second pin of the rectifying bridge B1 is connected with the positive output end of the first switching element Q1, and the second pin of the second switching element Q6852 is connected with the second switching element Q1 is connected with the second switching element U1, One end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected with the positive output end of a rectifier bridge B1, the other end of the resistor R5 is grounded, a pin 3 of a second switching element Q2 is grounded, a pin 2 of the second switching element Q2 is connected with the positive electrode of a photosensitive diode D2 and one end of the resistor R7, the other end of the resistor R7 is connected with the positive output end of a rectifier bridge B1 after being connected with a resistor R6, and the negative electrode of the photosensitive diode D2 is grounded.

In the present embodiment, the first switching element Q1 and the second switching element Q2 both employ transistors. The base of the triode corresponds to pin 2, the collector of the triode corresponds to pin 1, and the emitter of the triode corresponds to pin 3.

When the circuit for silicon controlled rectifier dimming is used, an interface ACL is connected with a live wire of alternating current and a silicon controlled rectifier dimmer, an interface ACN is connected with a zero line of alternating current, the alternating current enters a rectifier bridge B1 through the interface ACL and the ACN, the rectifier bridge B1 converts the alternating current into direct current and provides driving electric energy for a driving chip U1, power is supplied to a first switching element Q1 through a resistor R4 and a resistor R5, power is supplied to a second switching element Q2 through a resistor R6, when the silicon controlled rectifier dimmer dims to a high section, a TRIAC pin of the driving chip U1 obtains larger current through the resistor R1 and the resistor R8, so that the driving chip U1 starts to work, a load lamp bead 3 is lightened, a photosensitive diode D2 is conducted, a pin 2 of a second switching element Q2 is in a low level state, the second switching element Q2 is not conducted, and at the pin 2 of the first switching element Q1 is under the action of the resistor R4 and the resistor R5, the pin 2 of the first switch element Q1 presents a high level, the first switch element Q1 is turned on, the driving module 2 works normally, the load lamp bead 3 realizes brightness adjustment according to the silicon controlled dimmer, when the silicon controlled dimmer dims to a low section, the load lamp bead 3 is darker, the photodiode D2 presents a large resistance value at this time, the pin 2 of the second switch element Q2 is in a high level state at this time, the second switch element Q2 is turned on, the pin 2 of the first switch element Q1 presents a low level under the condition that the second switch element Q2 is turned on, the first switch element Q1 is turned off, the direct current is transmitted to the TRIAC pin of the driving chip U1 through the resistor R1 and the resistor R8, at this time, because of being in the dimming low section, the input current is small, the driving module 2 cannot continue to start to work, and simultaneously drive the load lamp bead 3 to be turned off, through the application of the circuit for silicon controlled dimming, the problem that the load lamp bead 3 flickers when dimming to the low section is avoided, and does not cause the reduction of power factor.

Example two:

the technical solution in this embodiment is basically the same as that in the first embodiment, except that MOS transistors are used for the first switching element Q1 and the second switching element Q2. When the MOS tube is adopted, the grid of the MOS tube corresponds to 2 pins, the source of the MOS tube corresponds to 1 pin, and the drain of the MOS tube corresponds to 3 pins.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. The circuit for silicon controlled rectifier dimming comprises a power module (1) connected with a mains supply, and is characterized by further comprising a driving module (2), a resistor R1, a resistor R8, a resistor R4, a resistor R5, a resistor R6, a photodiode D2, a first switching element Q1 and a second switching element Q2, wherein one end of the resistor R4, one end of the resistor R1, one end of the resistor R6 and the driving module (2) are connected with the power module (1), the other end of the resistor R4 is respectively connected with a pin 2 of the first switching element Q1 and one end of the resistor R5, the other end of the resistor R5 is grounded, a pin 1 of the first switching element Q1 is connected with the other end of the resistor R1, a pin 1 and a pin 3 of the first switching element Q1 are connected through the resistor R8, a pin 3 of the first switching element Q1 is connected with the driving module (2), the pin 1 of the second switch element Q2 is connected with the pin 2 of the first switch element Q1, the pin 2 of the second switch element Q2 is connected with the other end of the resistor R6 and the anode of the photodiode D2, and the cathode of the photodiode D2 and the pin 3 of the second switch element are both grounded.

2. The circuit of claim 1, wherein a resistor R7 is further connected in series between the resistor R6 and the 2-pin of the second switching element Q2.

3. The triac dimming circuit according to claim 1 or 2, wherein the first switching element Q1 and the second switching element Q2 are both transistors.

4. The circuit for silicon controlled rectifier dimming according to claim 1 or 2, wherein the driving module (2) comprises a driving chip U1, a resistor RS1, a resistor RS2, a resistor R2, a resistor R3 and a diode D1, the anode of the diode D1 is connected with the power module (1), one end of the resistor R2 is connected with the power module (1), the other end of the resistor R2 is connected with the VIN pin of the driving chip U1, the cathode of the diode D1 is connected with the HV pin of the driving chip U1, the TRIAC pin of the driving chip U1 is connected with the 3 pin of the first switching element Q1, the CS1 pin of the driving chip U1 is connected with the resistor RS1 and the resistor RS2 in series and then grounded, the CS2 pin of the driving chip U6 is connected with the connection point of the resistor RS1 and the resistor RS2, the VD pin and the DRAIN pin of the driving chip 1 are connected with the DRAIN pin through the resistor R3, and the rtcs 464 pin of the driving chip is grounded.

5. The circuit for silicon controlled rectifier dimming according to claim 4, wherein the power module (1) comprises a rectifier bridge B1, a fuse F1, a voltage dependent resistor RV1 and a voltage dependent resistor RV2, a first input end of the rectifier bridge B1 is respectively connected with one end of a voltage dependent resistor RV1 and one end of the fuse F1, the other end of the fuse F1 is connected with a live wire of alternating current, a second input end of the rectifier bridge B1 is connected with the other end of the voltage dependent resistor RV1 and a neutral wire of alternating current, a positive output end of the rectifier bridge B1 is connected with one end of a voltage dependent resistor RV2 and a positive electrode of a diode D1 in the drive module (2), and a negative output end of the rectifier bridge B1 is connected with the other end of the voltage dependent resistor RV2 and grounded.