CN110461055B - Lighting driving circuit and method and lighting system - Google Patents
Lighting driving circuit and method and lighting system Download PDFInfo
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- CN110461055B CN110461055B CN201910547062.7A CN201910547062A CN110461055B CN 110461055 B CN110461055 B CN 110461055B CN 201910547062 A CN201910547062 A CN 201910547062A CN 110461055 B CN110461055 B CN 110461055B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 66
- 239000010703 silicon Substances 0.000 claims abstract description 66
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000005286 illumination Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 12
- 238000012886 linear function Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a lighting driving circuit, a lighting driving method and a lighting system, wherein an alternating current power supply obtains input voltage through a rectifier bridge to supply power to a load, a silicon controlled rectifier dimmer is connected between the alternating current power supply and the rectifier bridge, the driving circuit comprises a silicon controlled rectifier conduction moment detection circuit, a first module, a second module and a current regulating circuit, the silicon controlled rectifier conduction moment detection circuit detects the conduction moment of the silicon controlled rectifier to obtain a conduction moment signal of the silicon controlled rectifier, the first module receives the conduction moment signal of the silicon controlled rectifier to obtain an expected output average current value, the second module receives the expected output average current value and samples the load current, and the current regulating circuit receives the load current reference value according to the expected output average current value and the load current to enable the load current to be equal to the load current reference value. The output average current of the invention can not change along with the input voltage or the load voltage, thereby improving the consistency and the linear adjustment rate.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a lighting driving circuit and method and a lighting system.
Background
In the lighting driving circuit, the LED is a common lighting source, and the LED driving circuit is taken as an example, so that the linear LED driving circuit in the prior art is widely used in a lighting system due to simple circuit and low cost. As shown in fig. 1, which is a schematic diagram of a linear LED driving circuit in the prior art, the negative terminal of the LED is connected to the first end of the adjusting tube M1, the second end of the adjusting tube M1 is connected to one end of the sampling resistor, the other end of the sampling resistor is grounded, the first input end of the operational amplifier is connected to the common end of the adjusting tube and the sampling resistor, the second input end of the operational amplifier receives the reference voltage Vref, the output end of the operational amplifier is connected to the control end of the adjusting tube M1, the sampling resistor R1 samples the current flowing through the LED, the operational amplifier U1 and the adjusting tube M1 form a negative feedback circuit, the operational amplifier U1 compares the voltage on the sampling resistor R1 with the reference voltage Vref, and the gate of the adjusting tube M1 is controlled to make the current sampling value of the LED equal to Vref/R1.
Fig. 2 shows a graph of the LED current with the change of the conduction angle of the triac dimmer when the input voltage is Vin1, and fig. 3 shows a graph of the LED current with the change of the conduction angle of the triac dimmer when the input voltage is Vin2, wherein t1, t2, t3 are three conduction times of the triac dimmerAnd T1 is the LED on time, and T is the input voltage period. As can be seen from fig. 2 and 3, when the input voltage is greater than the LED voltage during the on period of the scr dimmer, the LED is turned on and the output average current is I LED * (T1/T). As can be seen from comparing fig. 2 and 3, after the input voltage is changed, the on time T1 of the LED is changed even though the on angle of the triac dimmer is not changed, so that the output average current is changed. Therefore, the linear LED driving circuit of the prior art has the following technical problems: when the input voltage or the LED voltage changes, the output average current also changes, and the uniformity is poor, i.e., the linear adjustment rate is poor.
Disclosure of Invention
In view of the above, the present invention is directed to a lighting driving circuit and method for improving the linearity adjustment rate and consistency, and a lighting system, which are used for solving the technical problem that the output average current varies with the variation of the input voltage or the load voltage in the prior art.
The invention provides a lighting driving circuit, an alternating current power supply obtains input voltage through a rectifier bridge to supply power to a load, a silicon controlled rectifier dimmer is connected between the alternating current power supply and the rectifier bridge, the driving circuit comprises a silicon controlled rectifier conduction moment detection circuit, a first module, a second module and a current regulating circuit, the silicon controlled rectifier conduction moment detection circuit detects the silicon controlled rectifier conduction moment to obtain a silicon controlled rectifier conduction moment signal, the first module receives the silicon controlled rectifier conduction moment signal to obtain an expected output average current value, the second module receives the expected output average current value and samples the load current, and the current regulating circuit receives the load current reference value according to the expected output average current value and the load current, so that the load current is equal to the load current reference value.
Preferably, a first signal is generated according to an expected output average current value and a load current, the load current reference value is adjusted according to the first signal and a second signal, and the second signal and the input voltage have opposite change trends.
Preferably, the first module sets an expected output average current value according to the conduction time of the silicon controlled rectifier, and when the conduction time of the silicon controlled rectifier is earlier than the first time, the expected output average current value is equal to the first current; when the turn-on time of the silicon controlled rectifier is later than the first time and earlier than the second time, the expected output average current value changes along with the turn-on time of the silicon controlled rectifier; when the conduction time of the silicon controlled rectifier is later than the second time, the expected output average current value is the second current; the first time is later than the time when the input voltage is equal to the load voltage for the first time in one period, and the second time is earlier than the time when the output voltage is equal to the load voltage for the second time in one period.
Preferably, when the turned-on time of the thyristor is later than the first time and earlier than the second time, the expected output average current value is equal to a product of a first coefficient and a first current, and the first coefficient is a difference between the second time and the turned-on time of the thyristor and a difference between the second time and the first time.
Preferably, the second module comprises a first capacitor, the first capacitor being charged with a current source representative of the output average current, the first capacitor being discharged with a current source representative of the load current, the voltage across the first capacitor being representative of the load current reference.
Preferably, the current adjusting circuit is connected in series with a load, the current adjusting circuit comprises a first adjusting tube and an adjusting tube control circuit, the load is connected in series with the first adjusting tube, the adjusting tube control circuit samples load current and adjusts the control end of the first adjusting tube according to the load current and a load current reference value so that the load current is equal to the load current reference value.
Preferably, the illumination driving circuit is an LED driving circuit.
The invention also provides an illumination driving method, which comprises the following steps:
detecting the conduction time of the silicon controlled rectifier to obtain a conduction time signal of the silicon controlled rectifier;
receiving a conduction time signal of the silicon controlled rectifier to obtain an expected output average current value;
receiving an expected output average current value, sampling a load current, and adjusting a load current reference value according to the expected output average current value and the load current;
a load current reference value is received such that the load current is equal to the load current reference value.
Preferably, a first signal is generated according to an expected output average current value and a load current, the load current reference value is adjusted according to the first signal and a second signal, and the second signal and the input voltage have opposite change trends.
Preferably, an expected output average current value is set according to the conduction time of the silicon controlled rectifier, and when the conduction time of the silicon controlled rectifier is earlier than the first time, the expected output average current value is equal to the first current; when the turn-on time of the silicon controlled rectifier is later than the first time and earlier than the second time, the expected output average current value changes along with the turn-on time of the silicon controlled rectifier; when the conduction time of the silicon controlled rectifier is later than the second time, the expected output average current value is the second current; the first time is later than the time when the input voltage is equal to the load voltage for the first time in one period, and the second time is earlier than the time when the output voltage is equal to the load voltage for the second time in one period.
Preferably, when the turned-on time of the thyristor is later than the first time and earlier than the second time, the expected output average current value is equal to a product of a first coefficient and a first current, and the first coefficient is a difference between the second time and the turned-on time of the thyristor and a difference between the second time and the first time.
The invention also provides a lighting system which comprises any one of the lighting driving circuits.
Compared with the prior art, the circuit structure provided by the invention has the following advantages: the current regulating circuit has an instantaneous value current limiting function, so that the load current is equal to a load current reference value, a first module sets an expected output average current value according to the conduction time of the controllable silicon, and a second module regulates the load current reference value according to the expected output average current value and the load current, so that the output average current is the expected output average current value. The invention can not change the output average current along with the input voltage or the load voltage by closed-loop adjustment, thereby improving the consistency and the linear adjustment rate.
Drawings
FIG. 1 is a schematic diagram of a prior art LED driver circuit;
FIG. 2 is a waveform diagram showing the variation of load current with conduction angle when the input voltage is V1 in the prior art;
FIG. 3 is a waveform diagram showing the variation of the load current with the conduction angle when the input voltage is V2 in the prior art;
fig. 4 is a circuit configuration diagram of the illumination driving circuit of the present invention;
FIG. 5 is a schematic diagram of a high efficiency LED driver circuit of the present invention;
FIG. 6 is a waveform diagram showing the variation of load current with conduction angle according to the present invention;
FIG. 7 is a schematic diagram of an embodiment of the expected output average current value setting of the first module of the present invention;
fig. 8 is a schematic diagram of an embodiment of a second module of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present invention.
Fig. 4 illustrates a schematic diagram of a lighting driving circuit according to the present invention, in which an LED is taken as an example of a load, an input power source is an ac input, the ac power source obtains an input voltage through a rectifier bridge to supply power to the load, a thyristor dimmer is connected between the ac power source and the rectifier bridge, the ac input is connected to the rectifier bridge through the thyristor dimmer, a positive output terminal of the rectifier bridge is connected to a positive terminal of the load, and a negative terminal of the load is connected to a negative output terminal of the rectifier bridge through a current adjusting circuit.
The driving circuit comprises a silicon controlled rectifier conduction time detection circuit, a first module, a second module and a current regulation circuit, wherein the silicon controlled rectifier conduction time detection circuit detects the conduction time of the silicon controlled rectifier to obtain a silicon controlled rectifier conduction time signal, the first module receives the silicon controlled rectifier conduction time signal to obtain an expected output average current value, the second module receives the expected output average current value and samples load current, a load current reference value is regulated according to the expected output average current value and the load current, and the current regulation circuit receives the load current reference value to enable the load current to be equal to the load current reference value.
The current regulating circuit is connected in series with a load, the current regulating circuit comprises a first regulating tube M1 and a regulating tube control circuit, the load is connected in series with the first regulating tube M1, the regulating tube control circuit samples load current and regulates the control end of the first regulating tube according to the load current and a load current reference value, so that the load current is equal to the load current reference value. The adjusting tube control circuit comprises a first operational amplifier and a sampling resistor R1, wherein a first end of the first adjusting tube M1 is connected with the negative end of the load LED, a second end of the first adjusting tube M1 is connected with one end of the sampling resistor R1, the other end of the sampling resistor R1 is connected with the negative output end of the rectifier bridge, a first input end of the first operational amplifier U1 receives a reference voltage Vref, a second input end of the first operational amplifier is connected with a common end of the sampling resistor R1 and the first adjusting tube M1, and an output end of the first operational amplifier is connected with the control end of the first adjusting tube. The load current reference value is equal to the reference voltage Vref/R1, and when R1 is fixed, the load current reference value is only related to the reference voltage, so that the reference voltage value is actually adjusted by adjusting the load current reference value in the invention.
FIG. 5 illustrates a schematic diagram of a high efficiency lighting driving circuit of the present invention; and generating a first signal according to the expected output average current value and the load current, and adjusting the load current reference value according to the first signal and a second signal, wherein the change trend of the second signal and the change trend of the input voltage are opposite. Because the second signal and the input voltage have opposite trends, the load current is lower and kept constant, thereby achieving the purpose of high efficiency.
The remainder is the same as the illumination driving circuit described in fig. 4.
FIG. 6 is a waveform diagram showing the variation of load current with conduction angle according to the present invention; wherein t_triac refers to the turn-on time of the thyristor, T1 is the first time, T2 is the second time, and Vin is the input voltage. T1 and T2 are two selected moments, wherein the first moment T1 is later than the moment when the input voltage is equal to the load voltage for the first time in one period, and the second moment T2 is earlier than the moment when the output voltage is equal to the load voltage for the second time in one period. It can be seen that when the thyristor conduction time t_triac is earlier than T1, the load is conducted in the whole of the interval T1 to T2, when the thyristor conduction time t_triac is earlier than T2 and later than T1, the load is conducted only in the period t_triac-T2 in the interval T1 to T2, and when the thyristor conduction time t_triac is later than T2, the load is completely non-conducted in the interval T1 to T2.
The first module sets an expected output average current value according to the conduction time of the silicon controlled rectifier, and when the conduction time of the silicon controlled rectifier is earlier than the first time, the expected output average current value is equal to the first current; when the turn-on time of the silicon controlled rectifier is later than the first time and earlier than the second time, the expected output average current value changes along with the turn-on time of the silicon controlled rectifier; when the conduction time of the silicon controlled rectifier is later than the second time, the expected output average current value is the second current; the first time is later than the time when the input voltage is equal to the load voltage for the first time in one period, and the second time is earlier than the time when the output voltage is equal to the load voltage for the second time in one period.
When the conduction time of the controllable silicon is later than the first time and earlier than the second time, the expected output average current value can be set as required and is a linear or nonlinear function of the conduction time of the controllable silicon, and the output average current cannot change along with the change of the input voltage. The first current and the second current are also set as needed.
In the first module expected output average current value setting embodiment illustrated in fig. 7, when the time of the turn-on of the thyristor is later than the first time and earlier than the second time, the expected output average current value may be set as required as a linear function of the time of the turn-on of the thyristor. The second current is 0. Specifically, the silicon controlled rectifier turn-on time detection circuit detects the turn-on time of the silicon controlled rectifier to obtain a turn-on time signal of the silicon controlled rectifier, the first module sets an expected output AVERAGE current value according to the turn-on time of the silicon controlled rectifier, when the TRIAC turn-on time is earlier than T1, iled_average=i1, when the TRIAC turn-on time is later than T2, iled_average=0, when the track turn-on time is between T1 and T2, iled_average=i1 is a first coefficient, wherein the first coefficient is (T2-t_triac)/(T2-T1).
Wherein the expected output average current value is set as a linear function with respect to the thyristor on-time t_triac, and in other embodiments, a non-linear function may be set, the invention only gives one set embodiment, but other related setting of the expected output average current value as a function with respect to the thyristor on-time t_triac is also within the scope of the invention. The first current may be set as desired.
The present invention sets the expected output average current value, adjusts the load current reference value according to the expected output average current value and the load current (or further including the second signal) such that the output average current value is equal to the expected output average current value. Fig. 7 is one embodiment of its arrangement.
The first module calculates a dimming curve of an expected output average current value according to the conduction angle of the controllable silicon, and the second module receives the expected output average current value and simultaneously adjusts a reference voltage according to the expected output average current value and the load current (or further comprises a second signal) by sampling the load current (or further comprises a second signal), so that the output average current is controlled in a closed loop mode to change according to the dimming curve of the expected output average current value.
The second module adjusts the reference voltage according to the expected output average current value and the load current so that the output average current is the expected output average current value. The load current reference value, i.e. the reference voltage, is determined from the difference between the expected output average current value and the load current average value, integrated over the input voltage period, being equal to 0.
Fig. 8 shows an embodiment of a second module comprising a first capacitor C1, the first capacitor C1 being charged with a current source I1 characterizing the output average current, the first capacitor C1 being discharged with a current source I2 characterizing the load current, the voltage Vc1 across the first capacitor C1 being the reference voltage.
The particular circuit described above in fig. 8 is but one implementation, and alternatives and variations are possible, such as by way of a counter.
In addition, although the embodiments are described and illustrated separately above, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and that reference may be made to another embodiment without explicitly recited in one of the embodiments.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (12)
1. An illumination driving circuit, AC power supply obtains input voltage through the rectifier bridge and supplies power to the load, be connected with silicon controlled rectifier light modulator between AC power supply and the rectifier bridge, its characterized in that: the driving circuit comprises a silicon controlled rectifier conduction time detection circuit, a first module, a second module and a current regulation circuit, wherein the silicon controlled rectifier conduction time detection circuit detects the conduction time of the silicon controlled rectifier to obtain a silicon controlled rectifier conduction time signal, the first module receives the silicon controlled rectifier conduction time signal to obtain an expected output average current value, the second module receives the expected output average current value and samples load current, a load current reference value is regulated according to the expected output average current value and the load current, and the current regulation circuit receives the load current reference value to enable the load current to be equal to the load current reference value.
2. A lighting driver circuit as recited in claim 1, wherein: and generating a first signal according to the expected output average current value and the load current, and adjusting the load current reference value according to the first signal and a second signal, wherein the change trend of the second signal and the change trend of the input voltage are opposite.
3. A lighting drive circuit as recited in claim 1 or claim 2, wherein: the first module sets an expected output average current value according to the conduction time of the silicon controlled rectifier, and when the conduction time of the silicon controlled rectifier is earlier than the first time, the expected output average current value is equal to the first current; when the turn-on time of the silicon controlled rectifier is later than the first time and earlier than the second time, the expected output average current value changes along with the turn-on time of the silicon controlled rectifier; when the conduction time of the silicon controlled rectifier is later than the second time, the expected output average current value is the second current; the first time is later than the time when the input voltage is equal to the load voltage for the first time in one period, and the second time is earlier than the time when the output voltage is equal to the load voltage for the second time in one period.
4. A lighting driver circuit as recited in claim 3, wherein: when the conduction time of the silicon controlled rectifier is later than the first time and earlier than the second time, the expected output average current value is equal to the product of a first coefficient and a first current, and the first coefficient is the difference value between the second time and the conduction time of the silicon controlled rectifier and the difference value between the second time and the first time.
5. A lighting drive circuit as recited in claim 1 or claim 2, wherein: the second module comprises a first capacitor, the first capacitor is charged by a current source representing the output average current, the first capacitor is discharged by a current source representing the load current, and the voltage on the first capacitor represents the load current reference value.
6. A lighting drive circuit as recited in claim 1 or claim 2, wherein: the current regulating circuit is connected in series with a load, the current regulating circuit comprises a first regulating tube and a regulating tube control circuit, the load is connected in series with the first regulating tube, the regulating tube control circuit samples load current and regulates the control end of the first regulating tube according to the load current and a load current reference value so that the load current is equal to the load current reference value.
7. A lighting drive circuit as recited in any one of claims 1 or 2, wherein: the illumination driving circuit is an LED driving circuit.
8. A lighting driving method, comprising the steps of:
detecting the conduction time of the silicon controlled rectifier to obtain a conduction time signal of the silicon controlled rectifier;
receiving a conduction time signal of the silicon controlled rectifier to obtain an expected output average current value;
receiving an expected output average current value, sampling a load current, and adjusting a load current reference value according to the expected output average current value and the load current;
a load current reference value is received such that the load current is equal to the load current reference value.
9. A lighting driving method as recited in claim 8, wherein: and generating a first signal according to the expected output average current value and the load current, and adjusting the load current reference value according to the first signal and a second signal, wherein the change trend of the second signal and the change trend of the input voltage are opposite.
10. A lighting driving method as recited in claim 8 or 9, wherein: setting an expected output average current value according to the conduction time of the silicon controlled rectifier, wherein the expected output average current value is equal to the first current when the conduction time of the silicon controlled rectifier is earlier than the first time; when the turn-on time of the silicon controlled rectifier is later than the first time and earlier than the second time, the expected output average current value changes along with the turn-on time of the silicon controlled rectifier; when the conduction time of the silicon controlled rectifier is later than the second time, the expected output average current value is the second current; the first time is later than the time when the input voltage is equal to the load voltage for the first time in one period, and the second time is earlier than the time when the output voltage is equal to the load voltage for the second time in one period.
11. A lighting driving method as recited in claim 10, wherein: when the conduction time of the silicon controlled rectifier is later than the first time and earlier than the second time, the expected output average current value is equal to the product of a first coefficient and a first current, and the first coefficient is the difference value between the second time and the conduction time of the silicon controlled rectifier and the difference value between the second time and the first time.
12. A lighting system, characterized by: comprising the lighting driving circuit of any one of claims 1-7.
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| CN106132030A (en) * | 2016-08-18 | 2016-11-16 | 杰华特微电子（杭州）有限公司 | A kind of illumination driving circuit and illuminator |
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| JP5760184B2 (en) * | 2011-03-16 | 2015-08-05 | パナソニックＩｐマネジメント株式会社 | Lighting device |
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| CN103260321A (en) * | 2013-06-07 | 2013-08-21 | 无锡华润矽科微电子有限公司 | Dimmable LED illumination drive circuit |
| CN106132030A (en) * | 2016-08-18 | 2016-11-16 | 杰华特微电子（杭州）有限公司 | A kind of illumination driving circuit and illuminator |
| CN106304484A (en) * | 2016-08-22 | 2017-01-04 | 上海晶丰明源半导体有限公司 | Controllable silicon light modulation LED drive power and dimming controlling method thereof |
| CN107979888A (en) * | 2017-11-03 | 2018-05-01 | 杰华特微电子（杭州）有限公司 | LED light adjusting circuits and method |
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