CN111010767B - Hybrid dimming driving circuit and method for detecting LED current and dimming by using same - Google Patents
Hybrid dimming driving circuit and method for detecting LED current and dimming by using same Download PDFInfo
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- CN111010767B CN111010767B CN201911217010.XA CN201911217010A CN111010767B CN 111010767 B CN111010767 B CN 111010767B CN 201911217010 A CN201911217010 A CN 201911217010A CN 111010767 B CN111010767 B CN 111010767B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 81
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 81
- 239000010703 silicon Substances 0.000 claims abstract description 81
- 238000001514 detection method Methods 0.000 claims abstract description 62
- 238000005070 sampling Methods 0.000 claims description 77
- 238000004891 communication Methods 0.000 claims description 24
- 238000002955 isolation Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 1
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a mixed dimming driving circuit and a method for detecting and dimming LED current by using the same, wherein the driving circuit comprises a silicon controlled rectifier dimmer, a rectifying circuit, a silicon controlled rectifier dimmer detection circuit, a silicon controlled rectifier dimming constant current circuit, a wireless control circuit and an LED current detection circuit which are connected on the input end or the output end of the rectifying circuit, wherein the output end of the silicon controlled rectifier dimmer is connected with the input end of the rectifying circuit, one path of the output end of the rectifying circuit is connected with the input end of the silicon controlled rectifier dimming constant current circuit, the other path of the output end of the rectifying circuit is connected with the input end of the wireless control circuit, the output end of the silicon controlled rectifier dimming constant current circuit is connected with the input end of an LED load, and the wireless control circuit is respectively connected with the silicon controlled rectifier dimming constant current circuit, the silicon controlled rectifier dimmer detection circuit and the LED current detection circuit; the intelligent dimming lamp has the advantage that the brightness condition of the whole lamp can be truly reflected all the time when the silicon controlled rectifier dimming and the wireless intelligent dimming are compatible.
Description
Technical Field
The invention relates to a driving circuit of an LED lighting product, in particular to a mixed dimming driving circuit and a method for detecting and dimming an LED current by using the same.
Background
Conventionally, a silicon controlled dimmer is generally used for dimming in most families in the united states, and the voltage phase angle is adjusted by manually adjusting the silicon controlled dimmer to conduct dimming. In recent years, with the rapid development of wireless communication technology and internet technology, wireless communication technology and internet technology are increasingly applied to LED lighting products and wireless switching and dimming and toning of the LED lighting products are performed. Due to the addition of wireless communication technology, the LED lighting product can be dimmed by using a silicon controlled rectifier dimmer or a wireless communication device.
When the LED lighting product is compatible with the silicon controlled rectifier dimming and the wireless intelligent dimming, when the silicon controlled rectifier dimming is performed to the middle and low ends, the current value of the LED after the silicon controlled rectifier dimming is not input into the wireless intelligent dimming system, so that when the wireless communication equipment is used for dimming at the moment, the dimming range in the wireless intelligent dimming system cannot truly reflect the brightness condition of the whole lamp, and a user cannot know the brightness adjustment change condition of the whole lamp.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hybrid dimming driving circuit and a method for detecting and dimming an LED current by using the same, which can always truly reflect the brightness condition of a whole lamp when being compatible with silicon controlled dimming and wireless intelligent dimming.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a hybrid dimming drive circuit, includes silicon controlled rectifier dimmer, rectifier circuit, silicon controlled rectifier dimmer detection circuitry, silicon controlled rectifier dimming constant current circuit, wireless control circuit, the input of silicon controlled rectifier dimmer be connected with the commercial power, the output of silicon controlled rectifier dimmer with rectifier circuit's input be connected, another way is connected with the input of silicon controlled rectifier dimming constant current circuit, the output of silicon controlled rectifier dimming constant current circuit be connected with the input of LED load, silicon controlled rectifier dimming constant current circuit adopt analog dimming control mode to adjust luminance to the LED load, silicon controlled rectifier dimmer detection circuitry connect on rectifier circuit's input or the output on be used for detecting the phase variation or the voltage variation of silicon controlled rectifier dimmer, wireless control circuit's output with silicon controlled rectifier constant current circuit be connected, wireless control circuit with silicon controlled rectifier dimmer detection circuitry's input connection, its characterized in that: the mixed dimming driving circuit further comprises an LED current detection circuit, wherein the LED current detection circuit detects voltage values at two ends of a sampling resistor connected with an LED load in series in real time to obtain a current value flowing through the LED load, and the current value is fed back to the wireless control circuit to truly reflect dimming change conditions of the whole lamp on wireless communication equipment.
The controllable silicon dimming constant current circuit is composed of a first isolation diode used for enabling the controllable silicon dimming constant current circuit to be isolated from the rectifying circuit and the controllable silicon dimmer detection circuit connected to the input end of the rectifying circuit, a bleeder circuit used for providing maintenance current for the controllable silicon dimmer when the controllable silicon is dimmed, and a constant current circuit used for providing constant current for the LED load and dimming the LED load in an analog dimming control mode so that flickering does not occur in the LED load in the dimming process, wherein the positive electrode of the first isolation diode is connected with the output end of the rectifying circuit, the negative electrode of the first isolation diode is connected with the input end of the bleeder circuit, the bleeder circuit is connected with the constant current circuit, and the output end of the constant current circuit is connected with the input end of the LED load. Here, the bleeder circuit does not operate when there is no thyristor dimmer, to improve the operating efficiency.
The wireless control circuit is composed of a second isolation diode used for enabling the wireless control circuit to be isolated from the rectifying circuit and the silicon controlled rectifier dimmer detection circuit connected to the input end or the output end of the rectifying circuit, a wireless control module used for dimming an LED load through wireless communication equipment, and a constant voltage power supply circuit used for providing constant voltage for the wireless control module to enable the wireless control module to work normally, the anode of the second isolation diode is connected with the output end of the rectifying circuit, the cathode of the second isolation diode is connected with the input end of the constant voltage power supply circuit, the output end of the constant voltage power supply circuit is connected with the power supply end of the wireless control module, the output end of the wireless control module is connected with the constant current circuit, the wireless control module is respectively connected with the silicon controlled rectifier dimmer detection circuit and the output end of the LED current detection circuit, and the LED current detection circuit feeds back acquired current flowing through the LED load to the wireless control module in real time.
The LED current detection circuit is composed of the sampling resistor, a first operational amplifier, a second operational amplifier and a third operational amplifier, wherein the sampling resistor is an eleventh resistor, one end of the sampling resistor is connected with the in-phase input end of the first operational amplifier through a twelfth resistor, the other end of the sampling resistor is connected with the output end of an LED load, the other end of the sampling resistor is connected with the in-phase input end of the second operational amplifier through a fourteenth resistor, the common end connected with the in-phase input end of the first operational amplifier through a thirteenth resistor and a second capacitor which are connected in parallel, the common end connected with the in-phase input end of the second operational amplifier is grounded through a fifteenth resistor and a third capacitor which are connected in parallel, the power end of the first operational amplifier is grounded through a fourth capacitor, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the common end of the thirteenth resistor is connected with the common end of the third operational amplifier through a seventeenth resistor, the common end of the common amplifier is connected with the eighteenth resistor is connected with the common end of the third operational amplifier, the output end of the third operational amplifier is the output end of the LED current detection circuit and is connected with the wireless control module. The voltage difference between the two ends of the sampling resistor connected in series with the LED load and the ground can be detected, the voltage value on the sampling resistor is obtained according to the voltage difference between the two ends of the sampling resistor and the ground, the voltage value divided by the resistance value of the sampling resistor can obtain the current value flowing through the LED load, the detected voltage at one end of the sampling resistor is concretely divided and then output to the first operational amplifier, the voltage at the other end of the sampling resistor is output to the second operational amplifier after being divided, the first operational amplifier and the second operational amplifier play a role in voltage following, signal isolation is carried out on the first operational amplifier and the second operational amplifier, the voltage output by the output ends of the first operational amplifier and the second operational amplifier is input to the third operational amplifier, the difference between the two voltages is obtained through the third operational amplifier, the difference can reflect the voltage value at the two ends of the sampling resistor, and then the current on the sampling resistor, namely the current value flowing through the LED load, the difference is output to the wireless control module, and brightness change situation after the wireless communication equipment truly reflects on the wireless communication equipment truly.
The method for realizing LED current detection and dimming by using the mixed dimming driving circuit is characterized by comprising a sampling resistor connected in series with an LED load, wherein the voltage value on the sampling resistor is obtained by measuring the difference value between two ends of the sampling resistor and the ground voltage, and the voltage value on the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through the LED load, and the method comprises the following specific steps of:
when the silicon controlled rectifier dimmer is adopted for dimming, the current on the LED load can change along with the change of the voltage input by the silicon controlled rectifier dimmer; the LED current detection circuit divides the voltage at one end of the detected sampling resistor and inputs the voltage to the first operational amplifier, divides the voltage at the other end of the detected sampling resistor and inputs the voltage at the other end of the detected sampling resistor to the second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input to the third operational amplifier, the third operational amplifier outputs the difference value between the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltages at two ends of the sampling resistor, and the voltage at two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through an LED load; the LED current detection circuit outputs a current value flowing through the LED load to the wireless control module, so that the dimming condition of the silicon controlled rectifier dimmer is truly reflected on the wireless communication equipment;
when the wireless intelligent dimming is performed, the wireless control module receives a dimming value through the wireless communication equipment in advance, and outputs a change value with smaller current change to the constant current circuit according to the dimming value, and the constant current circuit changes the current on the LED load after receiving the change value; the LED current detection circuit divides the voltage at one end of the detected sampling resistor and inputs the voltage to the first operational amplifier, divides the voltage at the other end of the detected sampling resistor and inputs the voltage at the other end of the detected sampling resistor to the second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input to the third operational amplifier, the third operational amplifier outputs the difference value between the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltages at two ends of the sampling resistor, and the voltage at two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through an LED load; the wireless control module compares the input current value with the dimming value, if the input current value does not reach the dimming value, the wireless control module outputs a change value with smaller current change to the constant current circuit until the current value output by the LED current detection circuit to the wireless control module is equal to or close to the dimming value, the wireless control module stops outputting to the constant current circuit, and the wireless control module approximates the dimming value by outputting the change value with smaller current change, thereby realizing wireless intelligent dimming. The typical wireless control module will have a dimming time of less than 1 second from receiving the dimming value of the wireless communication device to completing the dimming.
Compared with the prior art, the invention has the advantages that:
1) When the controllable silicon light modulator is compatible with wireless intelligent light modulation, an LED current detection circuit is additionally arranged and connected with the output end of an LED load, and the output end of the LED current detection circuit is connected with a wireless control circuit, so that when the controllable silicon light modulator is adopted for light modulation, the current on the LED load can change along with the voltage change input by the controllable silicon light modulator, and the LED current detection circuit acquires the current value flowing through the LED load in real time and feeds back the current value to the wireless control circuit, thereby truly reflecting the light modulation change condition of the whole lamp on wireless communication equipment; when the wireless intelligent dimming is performed, the wireless control circuit receives a dimming value through the wireless communication equipment in advance, the wireless control circuit outputs a change value with smaller current change to the silicon controlled rectifier dimming constant current circuit, the current on the LED load is changed after the silicon controlled rectifier dimming constant current circuit receives the change value, the LED current detection circuit acquires the current value flowing on the LED load in real time and feeds back the current value to the wireless control circuit, the input current value is compared with the dimming value, if the input current value does not reach the dimming value, the wireless control circuit outputs a change value with smaller current change to the silicon controlled rectifier dimming constant current circuit, and the dimming value is approximated through outputting the change value with smaller current change, so that the wireless intelligent dimming is realized.
2) When the silicon controlled rectifier dimming and the wireless intelligent dimming are compatible, when the silicon controlled rectifier dimming is performed to the middle and low ends, the LED current value after the silicon controlled rectifier dimming is input into the wireless control circuit through the LED current detection circuit, so that the brightness condition of the whole lamp can be truly reflected when the wireless communication equipment is used for dimming.
Drawings
Fig. 1 is a circuit diagram of a hybrid dimming driving circuit according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
The invention provides a hybrid dimming driving circuit, which comprises a silicon controlled rectifier dimmer 1, a rectifying circuit BD1, a silicon controlled rectifier dimmer detection circuit 2, a silicon controlled rectifier dimming constant current circuit 3, a wireless control circuit 4 and an LED current detection circuit 5, wherein the input end of the silicon controlled rectifier dimmer 1 is connected with the mains supply, the output end of the silicon controlled rectifier dimmer 1 is connected with the input end of the rectifying circuit BD1, one path of the output end of the rectifying circuit BD1 is connected with the input end of the silicon controlled rectifier dimming constant current circuit 3, the other path of the output end of the rectifying circuit BD1 is connected with the input end of the wireless control circuit 4, the output end of the silicon controlled rectifier dimming constant current circuit 3 is connected with the input end of an LED load 6, the silicon controlled rectifier dimming constant current circuit 3 adopts an analog dimming control mode to dim the LED load 6, the silicon controlled rectifier dimmer detection circuit 2 is connected on the input end or the output end of the rectifying circuit BD1 for detecting the phase change or voltage change of the silicon controlled rectifier dimmer 1, the wireless control circuit 4 is connected with the silicon controlled rectifier constant current circuit 3, the wireless control circuit 4 is connected with the output end of the LED load 5 in series to obtain the real-time value of the LED current value, and the real-time value of the LED load 6 is controlled by the wireless control device, and the real-time value of the LED load current value is controlled by the LED load 5, and the real-time value is controlled by the LED load 6, and the real-time value is controlled by the LED load and the current value is controlled by the load and the load.
In this embodiment, the triac dimming constant current circuit 3 is composed of a first isolation diode D1 for isolating the triac dimming constant current circuit 3 from the rectifying circuit BD1 and the triac dimmer detection circuit 2 connected to the input terminal of the rectifying circuit BD1, a bleeder circuit 31 for providing a holding current to the triac dimmer 1 when the triac dimmes, and a constant current circuit 32 for providing a constant current to the LED load 6 and dimming the LED load 6 in an analog dimming control manner so that the LED load 6 does not flicker during dimming, wherein the positive electrode of the first isolation diode D1 is connected to the output terminal of the rectifying circuit BD1, the negative electrode of the first isolation diode D1 is connected to the input terminal of the bleeder circuit 31, the bleeder circuit 31 is connected to the constant current circuit 32, and the output terminal of the constant current circuit 32 is connected to the input terminal of the LED load 6. Here, the bleeder circuit 31 does not operate when there is no triac dimmer, to improve the operating efficiency.
In this embodiment, the wireless control circuit 4 is composed of a second isolation diode D3 for isolating the wireless control circuit 4 from the rectifying circuit BD1 and the triac dimmer detection circuit 2 connected to the input end or output end of the rectifying circuit BD1, a wireless control module (model TYWE 3L) M1 for dimming the LED load 6 by a wireless communication device, a constant voltage power supply circuit 41 for supplying a constant voltage to the wireless control module M1 to make the wireless control module M1 work normally, the positive electrode of the second isolation diode D3 is connected to the output end of the rectifying circuit BD1, the negative electrode of the second isolation diode D3 is connected to the input end of the constant voltage power supply circuit 41, the output end of the constant voltage power supply circuit 41 is connected to the power supply end of the wireless control module M1, namely, the 8 th pin, the output end of the wireless control module M1 is connected to the constant current control chip U2 in the constant current circuit 32, the 5 th pin of the wireless control module M1 is connected to the triac dimmer detection circuit 2, the 7 th pin of the wireless control module M1 is connected to the output end of the LED load 5, and the LED load 6 is fed back to the LED load detection circuit 1.
In this embodiment, the LED current detection circuit 5 is composed of a sampling resistor R11, a first operational amplifier 1A, a second operational amplifier 1B, and a third operational amplifier 1C, the sampling resistor R11 is an eleventh resistor R11, one end of the sampling resistor R11 is connected to the non-inverting input terminal of the first operational amplifier 1A through a twelfth resistor R12, the other end of the sampling resistor R11 is connected to the output terminal of the LED load 6, the other end of the sampling resistor R11 is connected to the non-inverting input terminal of the second operational amplifier 1B through a fourteenth resistor R14, the common end of the twelfth resistor R12 connected to the non-inverting input terminal of the first operational amplifier 1A is grounded through a thirteenth resistor R13 and a second capacitor C2 connected in parallel, the common end of the fourteenth resistor R14 connected to the non-inverting input terminal of the second operational amplifier 1B is grounded through a fifteenth resistor R15 and a third capacitor C3 connected in parallel, the power end of the first operational amplifier 1A is grounded through a fourth capacitor C4, the inverting input end of the first operational amplifier 1A is connected with the output end of the first operational amplifier 1A, the output end of the first operational amplifier 1A is connected with the non-inverting input end of the third operational amplifier 1C through a seventeenth resistor R17, the inverting input end of the second operational amplifier 1B is connected with the output end of the second operational amplifier 1B, the output end of the second operational amplifier 1B is connected with the inverting input end of the third operational amplifier 1C through an eighteenth resistor R18, the common end connected with the inverting input end of the third operational amplifier 1C is grounded through a nineteenth resistor R19, the non-inverting input end of the third operational amplifier 1C is connected with the output end of the third operational amplifier 1C through a sixteenth resistor R16, the output end of the third operational amplifier 1C is the output end of the LED current detection circuit 5 and is connected with the wireless control module M1. The voltage difference between two ends of the sampling resistor R11 connected in series with the LED load 6 and the ground can be detected, the voltage value on the sampling resistor R11 can be obtained according to the voltage difference between two ends of the sampling resistor R11 and the ground, the voltage value divided by the resistance value of the sampling resistor R11 can obtain the current value flowing through the LED load 6, the detected voltage at one end of the sampling resistor R11 is concretely divided and then output to the first operational amplifier 1A, the voltage at the other end of the sampling resistor R11 is divided and then output to the second operational amplifier 1B, the first operational amplifier 1A and the second operational amplifier 1B play a role in voltage following, the signals are isolated, the voltages output by the respective output ends of the first operational amplifier 1A and the second operational amplifier 1B are input to the third operational amplifier 1C, the difference between the two voltages can be obtained after passing through the third operational amplifier 1C, the voltage value at two ends of the sampling resistor R11 can be reflected, and then the current value flowing through the sampling resistor R11 can be reflected, the current value of the LED load 6 can be outputted to the wireless control module M, and the real brightness change situation can be reflected after the wireless communication is carried out by the wireless control module M1.
In this embodiment, the scr dimmer detection circuit 2 may detect a phase change or a voltage change of the scr dimmer 1, and transmit the phase change value or the voltage change value to the wireless control module M1, so that the wireless intelligent dimming can be reset to a wireless intelligent non-dimming state through the operation of the scr dimmer 1, specifically, a logic is set in the wireless control module M1, the scr dimmer 1 is used to operate after the wireless intelligent dimming, an output voltage of the scr dimmer 1 is divided by the scr dimmer detection circuit 2 and then output to the wireless control module M1, if a voltage input to the wireless control module M1 accords with a logic set by the wireless control module M1, the wireless control module M1 outputs a specific dimming value (typically a maximum value) to the constant current circuit 32, for example, a voltage of 0.5V or 2V can be set in the wireless control module M1, and when an input voltage of the scr dimmer 1 is divided by the scr detection circuit 2 and then input to the wireless control module M1 is smaller than the maximum value of 0.5V or 2V, the wireless intelligent dimming is reset to the wireless intelligent non-dimming state, and the wireless intelligent dimming is enabled to be output to the wireless intelligent non-dimming state by the wireless control module M32.
In the present embodiment, the rectifying circuit BD1 employs a conventional rectifying stack, that is, is composed of four diodes; the silicon controlled rectifier dimmer detection circuit 2 adopts the prior art, and the circuit diagram is shown in fig. 1; the bleeder circuit 31 adopts the prior art, the circuit diagram is shown in fig. 1, and the model of the control chip U1 in fig. 1 is BP5178; the constant current circuit 32 adopts the prior art, and the circuit diagram is shown in fig. 1, and the model of the constant current control chip U2 in fig. 1 is BP5711EJ; the constant voltage power supply circuit 41 adopts the prior art, the circuit diagram is as shown in fig. 1, the model of the constant voltage chip U3 in fig. 1 is KP15012, and the model of the linear voltage stabilizing chip U4 is ME6118a33M3G.
The method for realizing LED current detection and dimming by the mixed dimming driving circuit comprises the following specific processes:
when the triac dimmer 1 is used for dimming, the current on the LED load 6 will change with the voltage input by the triac dimmer 1; the LED current detection circuit 5 divides the voltage at one end of the detected sampling resistor R11 and inputs the divided voltage to the first operational amplifier 1A, divides the voltage at the other end of the detected sampling resistor R11 and inputs the divided voltage to the second operational amplifier 1B, the voltage output by each of the first operational amplifier 1A and the second operational amplifier 1B is input to the third operational amplifier 1C, the third operational amplifier 1C outputs the difference between the voltage output by the first operational amplifier 1A and the voltage output by the second operational amplifier 1B, the difference reflects the voltages at both ends of the sampling resistor R11, and the voltage at both ends of the sampling resistor R11 is divided by the resistance value of the sampling resistor R11 itself to obtain the current value flowing through the LED load 6; the LED current detection circuit 5 outputs a current flowing through the LED load 6 to the wireless control module M1, thereby truly reflecting the dimming condition of the triac dimmer 1 on the wireless communication device.
When the wireless intelligent dimming is performed, the wireless control module M1 receives a dimming value through the wireless communication equipment in advance, the wireless control module M1 outputs a change value with smaller current change to the constant current circuit 32 according to the dimming value, and the constant current circuit 32 changes the current on the LED load 6 after receiving the change value; the LED current detection circuit 5 divides the voltage at one end of the detected sampling resistor R11 and inputs the divided voltage to the first operational amplifier 1A, divides the voltage at the other end of the detected sampling resistor R11 and inputs the divided voltage to the second operational amplifier 1B, the voltage output by each of the first operational amplifier 1A and the second operational amplifier 1B is input to the third operational amplifier 1C, the third operational amplifier 1C outputs the difference between the voltage output by the first operational amplifier 1A and the voltage output by the second operational amplifier 1B, the difference reflects the voltages at both ends of the sampling resistor R11, and the voltage at both ends of the sampling resistor R11 is divided by the resistance value of the sampling resistor R11 to obtain the current flowing through the LED load 6; the LED current detection circuit 5 outputs the current flowing through the LED load 6 to the wireless control module M1, the wireless control module M1 compares the inputted current value with the dimming value, if the inputted current value does not reach the dimming value, the wireless control module M1 outputs a change value with smaller current change to the constant current circuit 32, until the current value outputted by the LED current detection circuit 5 to the wireless control module M1 is equal to or close to the dimming value, the wireless control module M1 stops outputting to the constant current circuit 32, and the wireless control module M1 approximates the dimming value by outputting the change value with smaller current change, thereby realizing wireless intelligent dimming. The typical wireless control module M1 has a dimming time of less than 1 second from receiving the dimming value of the wireless communication device to completing the dimming.
Claims (4)
1. The utility model provides a hybrid dimming drive circuit, includes silicon controlled rectifier dimmer, rectifier circuit, silicon controlled rectifier dimmer detection circuitry, silicon controlled rectifier dimming constant current circuit, wireless control circuit, the input of silicon controlled rectifier dimmer be connected with the commercial power, the output of silicon controlled rectifier dimmer with rectifier circuit's input be connected, another way is connected with the input of silicon controlled rectifier dimming constant current circuit, the output of silicon controlled rectifier dimming constant current circuit be connected with the input of LED load, silicon controlled rectifier dimming constant current circuit adopt analog dimming control mode to adjust luminance to the LED load, silicon controlled rectifier dimmer detection circuitry connect on rectifier circuit's input or the output on be used for detecting the phase variation or the voltage variation of silicon controlled rectifier dimmer, wireless control circuit's output with silicon controlled rectifier constant current circuit be connected, wireless control circuit with silicon controlled rectifier dimmer detection circuitry's input connection, its characterized in that: the mixed dimming driving circuit further comprises an LED current detection circuit, wherein the LED current detection circuit detects voltage values at two ends of a sampling resistor connected in series with an LED load in real time to obtain a current value flowing through the LED load, and the current value is fed back to the wireless control circuit to truly reflect dimming change conditions of the whole lamp on wireless communication equipment;
the LED current detection circuit is composed of the sampling resistor, a first operational amplifier, a second operational amplifier and a third operational amplifier, wherein the sampling resistor is an eleventh resistor, one end of the sampling resistor is connected with the in-phase input end of the first operational amplifier through a twelfth resistor, the other end of the sampling resistor is connected with the output end of an LED load, the other end of the sampling resistor is connected with the in-phase input end of the second operational amplifier through a fourteenth resistor, the common end connected with the in-phase input end of the first operational amplifier through a thirteenth resistor and a second capacitor which are connected in parallel, the common end connected with the in-phase input end of the second operational amplifier is grounded through a fifteenth resistor and a third capacitor which are connected in parallel, the power end of the first operational amplifier is grounded through a fourth capacitor, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the common end of the thirteenth resistor is connected with the common end of the third operational amplifier through a seventeenth resistor, the common end of the common amplifier is connected with the eighteenth resistor is connected with the common end of the third operational amplifier, the output end of the third operational amplifier is the output end of the LED current detection circuit and is connected with the wireless control module.
2. The hybrid dimming driving circuit according to claim 1, wherein: the controllable silicon dimming constant current circuit is composed of a first isolation diode used for enabling the controllable silicon dimming constant current circuit to be isolated from the rectifying circuit and the controllable silicon dimmer detection circuit connected to the input end of the rectifying circuit, a bleeder circuit used for providing maintenance current for the controllable silicon dimmer when the controllable silicon is dimmed, and a constant current circuit used for providing constant current for the LED load and dimming the LED load in an analog dimming control mode so that flickering does not occur in the LED load in the dimming process, wherein the positive electrode of the first isolation diode is connected with the output end of the rectifying circuit, the negative electrode of the first isolation diode is connected with the input end of the bleeder circuit, the bleeder circuit is connected with the constant current circuit, and the output end of the constant current circuit is connected with the input end of the LED load.
3. The hybrid dimming driving circuit according to claim 2, wherein: the wireless control circuit is composed of a second isolation diode used for enabling the wireless control circuit to be isolated from the rectifying circuit and the silicon controlled rectifier dimmer detection circuit connected to the input end or the output end of the rectifying circuit, a wireless control module used for dimming an LED load through wireless communication equipment, and a constant voltage power supply circuit used for providing constant voltage for the wireless control module to enable the wireless control module to work normally, the anode of the second isolation diode is connected with the output end of the rectifying circuit, the cathode of the second isolation diode is connected with the input end of the constant voltage power supply circuit, the output end of the constant voltage power supply circuit is connected with the power supply end of the wireless control module, the output end of the wireless control module is connected with the constant current circuit, the wireless control module is respectively connected with the silicon controlled rectifier dimmer detection circuit and the output end of the LED current detection circuit, and the LED current detection circuit feeds back acquired current flowing through the LED load to the wireless control module in real time.
4. A method of using the hybrid dimming drive circuit of claim 3 to achieve LED current detection and dimming, characterized by: the method comprises the following specific processes that a sampling resistor connected in series with an LED load exists, the voltage value on the sampling resistor is obtained by measuring the difference value between two ends of the sampling resistor and the ground voltage, and the voltage value on the sampling resistor is divided by the resistance value of the sampling resistor per se to obtain the current value flowing through the LED load:
when the silicon controlled rectifier dimmer is adopted for dimming, the current on the LED load can change along with the change of the voltage input by the silicon controlled rectifier dimmer; the LED current detection circuit divides the voltage at one end of the detected sampling resistor and inputs the voltage to the first operational amplifier, divides the voltage at the other end of the detected sampling resistor and inputs the voltage at the other end of the detected sampling resistor to the second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input to the third operational amplifier, the third operational amplifier outputs the difference value between the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltages at two ends of the sampling resistor, and the voltage at two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through an LED load; the LED current detection circuit outputs a current value flowing through the LED load to the wireless control module, so that the dimming condition of the silicon controlled rectifier dimmer is truly reflected on the wireless communication equipment;
when the wireless intelligent dimming is performed, the wireless control module receives a dimming value through the wireless communication equipment in advance, and outputs a change value with smaller current change to the constant current circuit according to the dimming value, and the constant current circuit changes the current on the LED load after receiving the change value; the LED current detection circuit divides the voltage at one end of the detected sampling resistor and inputs the voltage to the first operational amplifier, divides the voltage at the other end of the detected sampling resistor and inputs the voltage at the other end of the detected sampling resistor to the second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input to the third operational amplifier, the third operational amplifier outputs the difference value between the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltages at two ends of the sampling resistor, and the voltage at two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through an LED load; the wireless control module compares the input current value with the dimming value, if the input current value does not reach the dimming value, the wireless control module outputs a change value with smaller current change to the constant current circuit until the current value output by the LED current detection circuit to the wireless control module is equal to or close to the dimming value, the wireless control module stops outputting to the constant current circuit, and the wireless control module approximates the dimming value by outputting the change value with smaller current change, thereby realizing wireless intelligent dimming.
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