CN209882155U - Silicon controlled rectifier LED drive circuit of adjusting luminance - Google Patents
Silicon controlled rectifier LED drive circuit of adjusting luminance Download PDFInfo
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- CN209882155U CN209882155U CN201822132585.9U CN201822132585U CN209882155U CN 209882155 U CN209882155 U CN 209882155U CN 201822132585 U CN201822132585 U CN 201822132585U CN 209882155 U CN209882155 U CN 209882155U
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Abstract
The utility model provides a silicon controlled rectifier LED drive circuit of adjusting luminance, including rectifier circuit (10), control circuit (20), switch tube M, LED work branch circuit (40), electric capacity C and sampling resistance R2, LED work branch circuit (40) include LED lamp cluster, switch tube M; wherein, the rectification circuit (10) is connected with an external alternating current power supply; the LED working branch circuit (40) is connected with a capacitor C in parallel, one end of the LED working branch circuit is connected with the rectifying circuit (10), the other end of the LED working branch circuit is grounded, and the grounding end of the LED working branch circuit is connected with the negative end of the rectifying circuit (10) after passing through the sampling resistor R2; the control circuit (20) is connected with one end of the switching tube M and one end of the sampling resistor R2 for sampling and driving control. The LED lamp can eliminate stroboflash in silicon controlled rectifier dimming, and meets the requirement of the market on LED illumination.
Description
Technical Field
The utility model relates to an electronic circuit field, concretely relates to silicon controlled rectifier LED drive circuit that adjusts luminance.
Background
The intelligent dimming of LED illumination products is the development trend in future market, and silicon controlled rectifier dimming is the commonly used technological means, changes conduction angle size through adjusting silicon controlled rectifier dimmer's chopping phase place, realizes adjusting luminance. However, in the dimming process, as the cut angle of the thyristor is increased, that is, the conduction angle is reduced, the charging time of the capacitor is shorter and shorter, and the discharging time is longer and longer, so that the average charging current of the capacitor is smaller than the discharging current, and finally, the capacitor energy storage cannot meet the LED follow current in one period, so that the stroboscopic phenomenon occurs; meanwhile, in the discharging process of the capacitor, the insufficient energy storage cannot provide enough current for the LED light string, which also causes the occurrence of stroboflash.
Therefore, based on the thyristor dimming technology, a set of driving method and circuit for LED lighting needs to be designed to solve the above problems.
Novel content
This neotype main objective provides a silicon controlled rectifier LED drive circuit of adjusting luminance, aims at solving stroboscopic problem among the prior art.
The technical scheme is as follows:
a silicon controlled dimming LED driving circuit comprises a rectifying circuit (10), a control circuit (20), a switching tube M, LED working branch (40), a capacitor C and a sampling resistor R2, wherein the LED working branch (40) comprises an LED lamp string and a switching tube M; wherein, the rectification circuit (10) is connected with an external alternating current power supply; the LED working branch circuit (40) is connected with a capacitor C in parallel, one end of the LED working branch circuit is connected with the positive end of the rectifying circuit (10), the other end of the LED working branch circuit is grounded, and the grounding end of the LED working branch circuit is connected with the negative end of the rectifying circuit (10) after passing through the sampling resistor R2; the control circuit (20) is connected with one end of the switching tube M and one end of the sampling resistor R2 for sampling and driving control.
Preferably, the LED working branch (40) further includes a sampling resistor R1, one end of the sampling resistor R1 is connected to the source of the switching tube M and the control circuit, and the other end is grounded.
Preferably, the control circuit (20) includes an LED current control circuit (202), the LED current control circuit (202) includes terminals B4, B5, and B6, the terminal B4 is connected to the gate of the switch tube M, the terminal B5 is connected to one terminal of the sampling resistor R1 and the source of the switch tube M, and the terminal B6 is connected to the negative terminal of the rectification circuit (10) and one terminal of the sampling resistor R2.
Preferably, the control circuit (20) includes a charging current control circuit (201), the charging current control circuit (201) includes a terminal B1 and a terminal B2, the terminal B1 is connected to the positive terminal of the rectifying circuit (10), and the terminal B2 is connected to the positive terminal of the LED string and the positive terminal of the capacitor.
Preferably, the control circuit (20) is further provided with a voltage feedback control circuit (203) and a logic control circuit (204), the voltage feedback control circuit (203) has a terminal B3, and the terminal B3 is connected with the negative terminal of the LED string and the drain of the switching tube M; the voltage feedback control circuit (203), the logic control circuit (204) and the charging current control circuit (201) are connected in sequence.
Preferably, the logic control circuit (204) is integrated inside the voltage feedback control circuit (203).
Preferably, a voltage signal acquisition circuit (30) is additionally arranged between the positive end and the negative end of the rectifying circuit (10), and comprises resistors R3 and R4 which are connected in series, and the common end B9 of the resistors R3 and R4 is connected with the logic control circuit (204).
Through above-mentioned technical scheme, this novel following beneficial technological effect that can obtain:
(1) by detecting the charging time of the capacitor, the conduction current of the LED lamp string is correspondingly regulated and controlled, so that the problem of stroboflash caused by the fact that the average charging current of the capacitor is smaller than the discharging current is solved, and no stroboflash is achieved;
(2) continuous adjustment is performed based on the silicon controlled rectifier wave cutting process, so that non-stroboscopic dimming can be realized in the whole silicon controlled rectifier dimming process, and the silicon controlled rectifier dimming device has universality for different silicon controlled rectifiers;
(3) the input current is regulated and controlled through the average voltage of the negative end of the LED lamp string, so that the stroboscopic problem caused by insufficient current of the LED lamp string due to insufficient capacitor energy storage in each power supply period is solved;
(4) the output current waveform is reversely adjusted by detecting the waveform of the input voltage, thereby improving the efficiency.
Drawings
FIG. 1 is a schematic diagram of voltage and LED current for different SCR corner cut types;
fig. 2 is a schematic diagram of an LED driving circuit provided by the present invention;
FIG. 3 is a schematic diagram of a second LED driving circuit provided by the present invention;
FIG. 4 is a schematic diagram of a third LED driving circuit provided by the present invention;
FIG. 5 is a schematic diagram of a fourth LED driving circuit provided by the present invention;
fig. 6 is a schematic diagram of current and voltage in a third LED driving circuit provided by the present invention.
The meaning of the individual reference symbols in the figures is:
10-a rectifier circuit; 20-a control circuit; 201-a charging current control circuit; 202-LED current control circuit; 203-voltage feedback control circuit; 204-logic control circuitry; 30-a voltage signal acquisition circuit; 40-LED working branch.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to fig. 1 to 6 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the utility model provides a silicon controlled rectifier LED drive circuit that adjusts luminance, it acquires the charge time of electric capacity to according to the conduction current of this charge time regulation and control LED lamp cluster.
More specifically, the control of the conduction current is performed according to a set rule within a preset range, the longer the charging time is, the larger the current flowing through the LED string is, and when the charging time is greater than or equal to tmax, the conduction current is controlled to be a preset maximum current value ILEDmax; on the contrary, the shorter the charging time is, the smaller the current flowing through the LED string is controlled, and when the charging time is smaller than or equal to tmin, the conduction current is controlled to be the preset minimum current ILEDmin.
The tmax is a preset maximum charging time threshold value, and is smaller than the charging time of the capacitor without controlled silicon regulation; tmin is a preset minimum charging time threshold, and can be 0; the minimum current ILEDmin is a current value close to 0, preferably 0.
In a more specific example, the regulation process is as follows:
a current detection circuit is arranged in the charging loop and used for detecting the conduction time of the charging loop, and when the capacitor is charged, the current detection circuit detects that current flows; when the capacitor is discharged, no current flows through the current detection circuit. Therefore, the charging time of the capacitor can be obtained by detecting the time when the current flows in the charging loop.
Specifically, the output voltage value of the current control circuit is changed according to the acquired charging time so as to control the conduction size of a switch tube in a conduction loop of the LED lamp string, so that the current in the loop is controlled, and the conduction current of the LED lamp string is accurately adjusted to a desired value through the feedback of the voltage value of the input end of a sampling resistor in the loop. When the charging time is increased, the output voltage of the current control circuit is increased, namely the grid voltage of the switching tube is increased, and the conduction current of the LED lamp string is increased; on the contrary, when the charging time is reduced, the output voltage of the current control circuit is reduced, and the conduction current of the LED lamp string is reduced.
Therefore, the problem of stroboflash caused by the fact that the average charging current of the capacitor is smaller than the discharging current in the silicon controlled rectifier wave cutting process is solved; the adjusting process can be continuously adjusted along with the continuous change of the silicon controlled rectifier wave cutting process, so that no stroboflash is generated in the whole silicon controlled rectifier dimming process, and the silicon controlled rectifier dimming device has universality for different silicon controlled rectifiers.
As shown in fig. 1, when the silicon controlled rectifier has a small cut angle, the capacitor charging time is not affected. As shown in the first type of corner cut voltage waveform diagram in the figure, the charging time is t1, and the current of the LED string is fixed to a preset maximum current value ILEDmax under the action of the current control circuit; when the cut angle of the silicon controlled rectifier is increased to a certain degree, the charging time of the original capacitor is cut off, and the charging time is shorter and shorter along with the further increase of the cut angle; as shown in the second type of corner cut voltage waveform diagram, when t1 > t2 > t3, the current control circuit appropriately reduces ILED according to the detected charging time, when the silicon controlled rectifier corner cut is further increased, so that the charging time is extremely short, even as shown in the third type of corner cut voltage waveform diagram, when the charging time is completely cut off, t3 is 0, the LED string current is fixed to the preset minimum current value ILEDmin under the action of the current control circuit, and ILEDmin is less than or equal to 30% of Imax, and is preferably 0.
In a more specific embodiment, the average value of the input current is regulated and controlled according to the feedback of the average voltage of the negative terminal of the LED lamp string, and the input current comprises the current flowing through the LED lamp string and the capacitor charging current. When the average voltage of the negative terminal of the LED lamp string is greater than the reference voltage Vref1, the average value of the input current is reduced by regulation; when the average voltage of the negative terminal of the LED lamp string is less than the reference voltage Vref1, the average value of the input current is increased by regulation.
Through the feedback regulation and control process, the capacitor can be ensured to have enough energy storage to maintain the constant current state of the LED lamp string when the current is input in each period, and the stroboscopic problem caused by insufficient current of the LED lamp string due to insufficient energy storage of the capacitor in each power supply period is solved, so that stroboscopic prevention is achieved.
In a more specific embodiment, the acquisition of the total input voltage (bus input voltage) is also added, and the input current is controlled together according to the bus input voltage (transient state) of each period and the feedback of the average voltage of the negative terminal of the LED lamp string. The transient input current is reversely regulated and controlled according to the obtained voltage, so that the transient output current is reduced along with the rise of the input voltage of the bus, and the efficiency optimization is realized; meanwhile, the average value of the input current is regulated and controlled according to the feedback of the average voltage at the negative end of the LED lamp string, so that the constant current of the LED lamp string is ensured, and no stroboflash is realized. By the method, efficiency optimization is met, and the problem of LED stroboscopic is solved.
In order to realize the silicon controlled dimming LED driving method, the novel silicon controlled dimming LED driving circuit is further provided.
The LED driving circuit comprises a rectifying circuit 10, a control circuit 20, a switching tube M, LED working branch 40, a capacitor C and a sampling resistor R2, wherein the LED working branch 40 comprises an LED lamp string and a switching tube M; wherein, the rectification circuit 10 is connected with an external alternating current power supply; the LED working branch circuit 40 is connected with a capacitor C in parallel, one end of the LED working branch circuit is connected with the positive end of the rectifying circuit 10, the other end of the LED working branch circuit is grounded, and the grounding end of the LED working branch circuit is connected with the negative end of the rectifying circuit 10 after passing through the sampling resistor R2; the control circuit 20 is connected with one end of the switching tube M and one end of the sampling resistor R2 for sampling and driving control.
Specifically, the rectifier circuit 10 converts the alternating current into a half-wave direct current VB1, and the control circuit 20 is configured to control an input current IB2 and a current ILED flowing through the LED string, where the input current IB2 includes the current ILED flowing through the LED string and a capacitor charging current. The control circuit 20 regulates the magnitude of the input current IB2 according to the input half-wave dc VB1, and regulates the magnitude of the current ILED flowing through the LED string according to the detected capacitor charging time.
Further, the LED working branch 40 further includes a sampling resistor R1, one end of the sampling resistor R1 is connected to the source of the switching tube M and the control circuit, and the other end is grounded.
In an embodiment, as shown in fig. 2, the control circuit 20 includes a charging current control circuit 201, the charging current control circuit 201 includes a terminal B1 and a terminal B2, the terminal B1 is connected to the positive terminal of the rectifying circuit 10, the terminal B2 is connected to the positive terminal of the LED string and the positive terminal of the capacitor, and the magnitude of the input current IB2 is regulated according to the input half-wave direct current VB.
Further, the control circuit 20 further includes an LED current control circuit 202, the LED current control circuit 202 includes terminals B4, B5, and B6, the terminal B4 is connected to the gate of the switching tube M, the terminal B5 is connected to one end of the sampling resistor R1 and the source of the switching tube M, and the terminal B6 is connected to the negative terminal of the rectifying circuit 10 and one end of the sampling resistor R2.
The LED current control circuit 202 obtains the charging time of the capacitor by detecting the time t when the current passes through the sampling resistor R2, and after comparing the charging time with the time t1 when the current passes through the sampling resistor R2 when no thyristor is controlled, the LED current control circuit adjusts and controls the output voltage VB4 at the B4 end according to a set rule within a preset range to change the size of the ILED; at the same time, control circuit 20 accurately adjusts ILED to a desired value by sensing the voltage VB5 at the input of sampling resistor R1. Therefore, the problem of stroboflash caused by the fact that the average charging current of the capacitor is smaller than the discharging current in the silicon controlled rectifier wave cutting process is solved; the adjusting process can be continuously adjusted along with the continuous change of the silicon controlled rectifier wave cutting process, so that no stroboflash is generated in the whole silicon controlled rectifier dimming process, and the silicon controlled rectifier dimming device has universality for different silicon controlled rectifiers.
In a more specific embodiment, as shown in fig. 3, the control circuit 20 is further provided with a voltage feedback control circuit 203 and a logic control circuit 204, the voltage feedback control circuit 203 has a terminal B3, and the terminal B3 is connected to the negative terminal of the LEI) string and the drain of the switch tube M; the voltage feedback control circuit 203, the logic control circuit 204 and the charging current control circuit 201 are connected in sequence; alternatively, as shown in fig. 4, the logic control circuit 204 is integrated inside the voltage feedback control circuit 203, and one end of the voltage feedback control circuit 203 is connected to the negative terminal of the LEI) string light and the drain of the switching tube M; the other end of the voltage feedback control circuit 203 is connected to the charging current control circuit 201.
The voltage feedback control circuit 203 detects LEI) voltage VB3 at the negative end of the string through a terminal B3, so that an average voltage of VB3 is obtained; the logic control circuit 204 converts the average voltage signal of VB3 into a current signal, and feeds the current signal back to the charging current control circuit 201, so as to regulate and control the input current IB2, so that the stored energy in the capacitor C can ensure that sufficient current exists in the LED string when the capacitor C discharges.
Specifically, when the average voltage VB3 of the negative end of the LEI) string is greater than the reference voltage Vref1 in the voltage feedback control circuit, the voltage feedback circuit discharges electricity internally, the signal output to the charging current control circuit 201 decreases, and the charging current control circuit 201 regulates and controls the average value of the input current IB2 to decrease correspondingly; when the average voltage of the negative terminal of the LEI) string is less than the reference voltage Vref1, the voltage feedback circuit is charged internally, the signal output to the charging current control circuit 201 is increased, and the charging current control circuit 201 regulates the average value of the input current IB2 to be increased. Through the feedback regulation and control process, enough energy storage on the capacitor can be ensured to maintain the constant current state of the LEI) lamp string when the current wave valley is input in each period, and the stroboscopic problem caused by unstable current in the capacitor discharging process in each period is solved, so that stroboscopic phenomenon is avoided.
In another more specific embodiment, as shown in fig. 5, the control circuit 20 is additionally provided with a voltage signal collecting circuit 30, which includes resistors R3 and R4 connected in series, and the common terminal B9 of the resistors R3 and R4 is connected to the logic control circuit 204.
The logic control circuit 204 obtains the transient voltage of the bus input voltage VB1 through voltage detection, obtains a voltage feedback signal B7 output by the voltage feedback control circuit 203 according to the average voltage of VB3, outputs a control signal B8 according to the input voltage VB1 and the feedback signal B7, and outputs the charging current IB2 according to the control signal B8.
Specifically, VB9 is a sine wave as the rectified waveform because it is linearly related to the bus input voltage VB 1. The logic control circuit 204 subtracts the detected voltage VB9 from the built-in reference voltage Vref2 by a subtraction unit to invert the waveform into V' B9, adds the signal with a B7 signal by an addition unit, and converts the signal into an input signal B8 of the charging current control circuit, thereby obtaining an output current IB2 inverted to the waveform of the bus input voltage.
The specific working process is shown in fig. 6:
at time t1, VB1 is greater than voltage VB2, capacitor C starts to charge, the voltage of VB3 starts to increase, current control signal B8 output by logic control circuit 204 decreases with the rise of input voltage VB1, output current IB2 at B2 also decreases with the rise of input voltage VB1, and current IB2 is minimum when voltage VB1 is maximum; then, the voltage VB1 decreases, the current control signal B8 increases, and the output current IB2 also increases;
at time t2, when the voltage VB1 is smaller than the voltage VB2, the capacitor C starts to discharge, and the output current IB2 is 0;
at the time t 2-t 3, the voltage VB1 is always smaller than the voltage VB2, and the capacitor C is continuously discharged to consume stored energy. The voltage feedback control circuit 203 senses the average voltage of VB3 to ensure that the stored energy on capacitor C during the discharge phase results in sufficient current in the LED string.
In the embodiment, the transient input current is reversely regulated and controlled through the obtained voltage, so that the transient output current is reduced along with the increase of the input voltage of the bus, and the efficiency optimization is realized; meanwhile, the average value of the input current is regulated and controlled according to the feedback of the average voltage at the negative end of the LED lamp string, so that the LED lamp string is ensured to be constant, and no stroboflash is caused; the requirement of LED illumination on the market is met.
The above-described embodiments are merely illustrative of the principles of the present disclosure. It is to be understood that modifications and variations of the arrangements and details described herein will be apparent to those skilled in the art. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto, and not by the specific details presented by way of the description and illustration of the embodiments presented herein.
Claims (7)
1. The silicon controlled dimming LED driving circuit is characterized by comprising a rectifying circuit (10), a control circuit (20), a switching tube M, LED working branch (40), a capacitor C and a sampling resistor R2, wherein the LED working branch (40) comprises an LED lamp string and a switching tube M; wherein, the rectification circuit (10) is connected with an external alternating current power supply; the LED working branch circuit (40) is connected with a capacitor C in parallel, one end of the LED working branch circuit is connected with the positive end of the rectifying circuit (10), the other end of the LED working branch circuit is grounded, and the grounding end of the LED working branch circuit is connected with the negative end of the rectifying circuit (10) after passing through the sampling resistor R2; the control circuit (20) is connected with one end of the switching tube M and one end of the sampling resistor R2 for sampling and driving control.
2. The LED driving circuit according to claim 1, wherein the LED working branch (40) further comprises a sampling resistor R1, one end of the sampling resistor R1 is connected to the source of the switching tube M and the control circuit, and the other end is grounded.
3. The LED driving circuit according to claim 2, wherein the control circuit (20) comprises an LED current control circuit (202), the LED current control circuit (202) comprises terminals B4, B5 and B6, the terminal B4 is connected with the gate of the switch tube M, the terminal B5 is connected with one end of the sampling resistor R1 and the source of the switch tube M, and the terminal B6 is connected with the negative terminal of the rectifying circuit (10) and one end of the sampling resistor R2.
4. The LED driving circuit according to any one of claims 1-3, wherein the control circuit (20) comprises a charging current control circuit (201), the charging current control circuit (201) comprises a terminal B1 and a terminal B2, the terminal B1 is connected to the positive terminal of the rectifying circuit (10), and the terminal B2 is connected to the positive terminal of the LED string and the positive terminal of the capacitor.
5. The LED driving circuit according to claim 4, wherein the control circuit (20) is further provided with a voltage feedback control circuit (203) and a logic control circuit (204), the voltage feedback control circuit (203) has a terminal B3, the terminal B3 is connected to the negative terminal of the LED string and the drain of the switch tube M; the voltage feedback control circuit (203), the logic control circuit (204) and the charging current control circuit (201) are connected in sequence.
6. LED drive circuit according to claim 5, wherein the logic control circuit (204) is integrated inside a voltage feedback control circuit (203).
7. The LED driving circuit according to claim 5 or 6, wherein a voltage signal acquisition circuit (30) is added between the positive terminal and the negative terminal of the rectifying circuit (10), and comprises resistors R3 and R4 connected in series, and the common terminal B9 of the resistors R3 and R4 is connected with the logic control circuit (204).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822132585.9U CN209882155U (en) | 2018-12-18 | 2018-12-18 | Silicon controlled rectifier LED drive circuit of adjusting luminance |
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| CN201822132585.9U CN209882155U (en) | 2018-12-18 | 2018-12-18 | Silicon controlled rectifier LED drive circuit of adjusting luminance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587880A (en) * | 2018-12-18 | 2019-04-05 | 陕西亚成微电子股份有限公司 | A kind of controllable silicon light modulation LED driving method and circuit |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587880A (en) * | 2018-12-18 | 2019-04-05 | 陕西亚成微电子股份有限公司 | A kind of controllable silicon light modulation LED driving method and circuit |
| CN109587880B (en) * | 2018-12-18 | 2024-02-20 | 陕西亚成微电子股份有限公司 | Driving method and circuit for silicon controlled rectifier dimming LED |
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Effective date of registration: 20220721 Address after: 710000 Room 201, building 6, No. 15, Shanglinyuan 1st Road, high tech Zone, Xi'an, Shaanxi Province Patentee after: XI'AN YARUN MICRO OPTOELECTRONICS TECHNOLOGY CO.,LTD. Address before: Room 301, block a, Hanyun Pavilion, Xi'an Software Park, No.68, Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710075 Patentee before: SHAANXI REACTOR MICROELECTRONICS Co.,Ltd. |
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