CN111010767A - Hybrid dimming driving circuit and method for realizing LED current detection and dimming by using same - Google Patents
Hybrid dimming driving circuit and method for realizing LED current detection and dimming by using same Download PDFInfo
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Abstract
The invention discloses a hybrid dimming driving circuit and a method for realizing LED current detection and dimming by using the same, the driving circuit comprises a silicon controlled dimmer, a rectifying circuit, a silicon controlled dimmer detection circuit connected to the input end or the output end of the rectifying circuit, a silicon controlled dimming constant current circuit, a wireless control circuit and an LED current detection circuit, the output end of the silicon controlled 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 dimming constant current circuit, the other path is connected with the input end of the wireless control circuit, the output end of the silicon controlled light-dimming constant current circuit is connected with the input end of the LED load, the wireless control circuit is respectively connected with the silicon controlled light-dimming constant current circuit, the silicon controlled light dimmer detection circuit and the LED current detection circuit, and the LED current detection circuit is connected with the output end of the LED load; the intelligent dimming circuit has the advantages that the brightness condition of the whole lamp can be always and truly reflected when the silicon controlled 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 hybrid dimming driving circuit and a method for realizing LED current detection and dimming by using the same.
Background
Conventionally, most households in the united states use a thyristor dimmer to perform dimming, and the thyristor dimmer is manually adjusted to adjust a voltage phase angle to perform on-state dimming. In recent years, with the rapid development of wireless communication technology and internet technology, the wireless communication technology and the internet technology are gradually applied to LED lighting products and wireless switching, dimming and color mixing are performed on the LED lighting products. Due to the fact that the wireless communication technology is added, the LED lighting product can adopt the silicon controlled rectifier dimmer to conduct dimming and can also adopt the wireless communication equipment to conduct dimming.
When the LED lighting product is compatible with silicon controlled dimming and wireless intelligent dimming, when the silicon controlled dimming is adjusted to a middle-low end, because the LED current value after the silicon controlled dimming is dimmed is not input into the wireless intelligent dimming system, the dimming range in the wireless intelligent dimming system cannot truly reflect the brightness condition of the whole lamp when the wireless communication equipment is adopted for dimming at the moment, and therefore 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 realizing LED current detection and dimming by using the same, which can always and truly reflect the brightness of an adjusted lamp when the dimming of a controlled silicon and wireless intelligent dimming are compatible.
The technical scheme adopted by the invention for solving the technical problems is as follows: a mixed dimming drive circuit comprises a silicon controlled dimmer, a rectifying circuit, a silicon controlled dimmer detection circuit, a silicon controlled dimming constant current circuit and a wireless control circuit, wherein the input end of the silicon controlled dimmer is connected with mains supply, the output end of the silicon controlled 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 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 dimming constant current circuit is connected with the input end of an LED load, the silicon controlled dimming constant current circuit adopts an analog dimming control mode to dim the LED load, the silicon controlled dimmer detection circuit is connected to the input end or the output end of the rectifying circuit and is used for detecting the phase change or the voltage change of the silicon controlled dimmer, the output end of the wireless control circuit is connected with the silicon controlled rectifier dimming constant current circuit, the wireless control circuit is connected with the silicon controlled rectifier dimmer detection circuit, and the wireless control circuit is 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 the LED load in series in real time to obtain a current value flowing through the LED load, and feeds the current value back to the wireless control circuit so as to truly reflect the dimming change condition of the whole lamp on the wireless communication equipment.
The silicon controlled light dimming constant current circuit consists of a first isolating diode used for isolating the silicon controlled light dimming constant current circuit from the rectifying circuit and the silicon controlled light dimmer detection circuit connected to the input end of the rectifying circuit, a bleeder circuit used for providing a maintaining current for the silicon controlled light dimmer when the silicon controlled light is dimmed, and a constant current circuit used for providing a constant current for the LED load and dimming the LED load by adopting an analog dimming control mode so as to ensure that the LED load does not flicker in the light dimming process, the anode of the first isolation diode is connected with the output end of the rectifying circuit, the cathode of the first isolation diode is connected with the input end of the bleeder circuit, the discharge 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 work when there is no thyristor dimmer to improve work efficiency.
The wireless control circuit consists of a second isolating diode used for isolating the wireless control circuit 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 supply circuit used for providing constant voltage for the wireless control module so as to enable the wireless control module to normally work, wherein the anode of the second isolating diode is connected with the output end of the rectifying circuit, the cathode of the second isolating diode is connected with the input end of the constant voltage supply circuit, the output end of the constant voltage supply circuit is connected with the power supply end of the wireless control module, and the output end of the wireless control module is connected with the constant current circuit, the wireless control module is respectively connected with the output ends of the silicon controlled dimmer detection circuit and the LED current detection circuit, and the LED current detection circuit feeds back current which is obtained in real time and flows through the LED load to the wireless control module.
The LED current detection circuit consists 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 non-inverting 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 non-inverting input end of the second operational amplifier through a fourteenth resistor, the common end of the twelfth resistor, which is connected with the non-inverting input end of the first operational amplifier, is grounded through a thirteenth resistor and a second capacitor which are connected in parallel, the common end of the fourteenth resistor, which is connected with the non-inverting 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 output end of the first operational amplifier is connected with the non-inverting input end of the third operational amplifier through a seventeenth resistor, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier is connected with the inverting input end of the third operational amplifier through an eighteenth resistor, the common end of the eighteenth resistor connected with the inverting input end of the third operational amplifier is grounded through a nineteenth resistor, the non-inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier through a sixteenth resistor, and the output end of the third operational amplifier is the output end of the LED current detection circuit and the non-inverting input end of the LED current detection circuit The line control module is connected. The voltage difference between the two ends of a sampling resistor connected with the LED load in series can be detected, the voltage value on the sampling resistor can be obtained according to the voltage difference between the two ends of the sampling resistor and the ground, the voltage value can be divided by the resistance value of the sampling resistor to obtain the current value flowing through the LED load, the detected voltage at one end of the sampling resistor is divided and then output to a first operational amplifier, the voltage at the other end of the sampling resistor is divided and then output to a second operational amplifier, the first operational amplifier and the second operational amplifier play a role in voltage following and carry out signal isolation in front and back of 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 a third operational amplifier, the difference between the two voltages is obtained after the third operational amplifier, the difference can reflect the voltage values at the two ends of the sampling resistor, and further can reflect the current on the, the difference value is output to the wireless control module, and the brightness change condition after dimming is truly reflected on the wireless communication equipment through the wireless control module.
A method for realizing LED current detection and dimming by using the hybrid dimming drive circuit is characterized in that a sampling resistor connected with an LED load in series is arranged, a voltage value on the sampling resistor is obtained by measuring a difference value from two ends of the sampling resistor to a ground voltage, and a current value flowing through the LED load is obtained by dividing the voltage value on the sampling resistor by the resistance value of the sampling resistor, and the method specifically comprises the following steps:
when the silicon controlled dimmer is used for dimming, the current on the LED load can change along with the change of the voltage input by the silicon controlled dimmer; the LED current detection circuit divides the voltage of one end of the detected sampling resistor and then inputs the voltage into a first operational amplifier, divides the voltage of the other end of the detected sampling resistor and then inputs the voltage into a second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input into a third operational amplifier, the third operational amplifier outputs the difference value of the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltage at the two ends of the sampling resistor, and the voltage at the two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through the LED load; the LED current detection circuit outputs the 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 wireless intelligent dimming is carried out, the wireless control module receives a dimming value through wireless communication equipment in advance, the wireless control module outputs a change value with small 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 of one end of the detected sampling resistor and then inputs the voltage into a first operational amplifier, divides the voltage of the other end of the detected sampling resistor and then inputs the voltage into a second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input into a third operational amplifier, the third operational amplifier outputs the difference value of the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltage at the two ends of the sampling resistor, and the voltage at the two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through the LED load; the LED current detection circuit outputs a current value flowing through an LED load to the wireless control module, the wireless control module compares the input current value with a dimming value, if the input current value does not reach the dimming value, the wireless control module outputs a change value with small current change to the constant current circuit, the wireless control module stops outputting the change value to the constant current circuit until the current value output to the wireless control module by the LED current detection circuit is equal to or close to the dimming value, and the wireless control module approaches the dimming value by outputting the change value with small current change, so that wireless intelligent dimming is realized. The time from the reception of the dimming value of the wireless communication device to the completion of the adjustment of the brightness is generally less than 1 second by the wireless control module.
Compared with the prior art, the invention has the advantages that:
1) when the silicon controlled light dimming and the wireless intelligent light dimming are compatible, an LED current detection circuit is additionally arranged and is 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 silicon controlled light dimming is adopted for dimming, the current on the LED load can change along with the change of the voltage input by the silicon controlled light dimming device, the LED current detection circuit obtains the current value flowing through the LED load in real time and feeds the current value back to the wireless control circuit, and the dimming change condition of the whole lamp can be truly reflected on the wireless communication equipment; when wireless intelligent dimming is carried out, the wireless control circuit receives a dimming value through wireless communication equipment in advance, the wireless control circuit outputs a change value with small current change to the silicon controlled dimming constant current circuit, the silicon controlled dimming constant current circuit changes the current on the LED load after receiving the change value, the LED current detection circuit obtains the current value flowing through the LED load in real time and feeds the current value back to the wireless control circuit, the input current value and the dimming value are compared, if the input current value does not reach the dimming value, the wireless control circuit outputs the change value with small current change to the silicon controlled dimming constant current circuit, and the dimming value is approached through the change value with small current change, so that wireless intelligent dimming is realized.
2) When the silicon controlled light modulator and the wireless intelligent light modulator are compatible, when the silicon controlled light modulator is adjusted to a middle-low end, the LED current value after the silicon controlled light modulator is adjusted in light is input into the wireless control circuit through the LED current detection circuit, and therefore when the wireless communication equipment is used for adjusting light, the brightness condition of the whole lamp can still be reflected really.
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 accompanying examples.
The invention provides a hybrid dimming driving circuit, which comprises a silicon controlled dimmer 1, a rectifying circuit BD1, a silicon controlled dimmer detection circuit 2, a silicon controlled 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 dimmer 1 is connected with mains supply, the output end of the silicon controlled dimmer 1 is connected with the input end of a rectifying circuit BD1, one path of the output end of the rectifying circuit BD1 is connected with the input end of the silicon controlled 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 dimming constant current circuit 3 is connected with the input end of an LED load 6, the silicon controlled dimming constant current circuit 3 adopts an analog dimming control mode to dim the LED load 6, the silicon controlled dimmer detection circuit 2 is connected with the input end or the output end of the rectifying circuit BD1, the output end of the wireless control circuit 4 is connected with the silicon controlled light dimming constant current circuit 3, the wireless control circuit 4 is connected with the silicon controlled light dimmer detection circuit 2, the LED current detection circuit 5 is connected with the output end of the LED load 6, the output end of the LED current detection circuit 5 is connected with the wireless control circuit 4, the LED current detection circuit 5 detects the voltage values at two ends of a sampling resistor R11 which is connected with the LED load 6 in series in real time, the current value flowing through the LED load 6 is obtained, and the current value is fed back to the wireless control circuit 4 so as to truly reflect the light dimming change condition of the whole lamp on the wireless communication equipment.
In this embodiment, the scr dimming constant current circuit 3 includes a first isolation diode D1 for isolating the scr dimming constant current circuit 3 from the rectifier circuit BD1 and the scr dimmer detection circuit 2 connected to the input terminal of the rectifier circuit BD1, a drain circuit 31 for supplying a holding current to the scr dimmer 1 during dimming, and a constant current circuit 32 for supplying 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 anode of the first isolation diode D1 is connected to the output terminal of the rectifier circuit BD1, the cathode of the first isolation diode D1 is connected to the input terminal of the drain circuit 31, the drain 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, so as to improve the operation efficiency.
In this embodiment, the wireless control circuit 4 is composed of a second isolating diode D3 for isolating the wireless control circuit 4 from the rectifying circuit BD1 and the thyristor dimmer detecting circuit 2 connected to the input terminal or the output terminal of the rectifying circuit BD1, a wireless control module (model number TYWE3L) M1 for dimming the LED load 6 through the wireless communication device, a constant voltage supply circuit 41 for supplying a constant voltage to the wireless control module M1 to normally operate the wireless control module M1, an anode of the second isolating diode D3 is connected to the output terminal of the rectifying circuit BD1, a cathode of the second isolating diode D3 is connected to the input terminal of the constant voltage supply circuit 41, an output terminal of the constant voltage supply circuit 41 is connected to the power supply terminal of the wireless control module M1, i.e., the 8 th pin, an output terminal of the wireless control module M1, i.e., the 6 th pin is connected to the control chip U2 in the constant current circuit 32, the 5 th pin of the wireless control module M1 is connected to the scr dimmer detection circuit 2, the 7 th pin of the wireless control module M1 is connected to the output terminal of the LED current detection circuit 5, and the LED current detection circuit 5 feeds back the current flowing through the LED load 6 acquired in real time to the wireless control module M1.
In this embodiment, the LED current detection circuit 5 comprises a sampling resistor R11, a first operational amplifier 1A, a second operational amplifier 1B, and a third operational amplifier 1C, wherein 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, a 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, a 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 supply terminal of the first operational amplifier 1A is grounded through a fourth capacitor C4, the inverting input terminal of the first operational amplifier 1A is connected to the output terminal of the first operational amplifier 1A, the output terminal of the first operational amplifier 1A is connected to the non-inverting input terminal of the third operational amplifier 1C through a seventeenth resistor R17, the inverting input terminal of the second operational amplifier 1B is connected to the output terminal of the second operational amplifier 1B, the output terminal of the second operational amplifier 1B is connected to the inverting input terminal of the third operational amplifier 1C through an eighteenth resistor R18, the common terminal of the eighteenth resistor R18 connected to the inverting input terminal of the third operational amplifier 1C is grounded through a nineteenth resistor R19, the non-inverting input terminal of the third operational amplifier 1C is connected to the output terminal of the third operational amplifier 1C through a sixteenth resistor R16, and the output terminal of the third operational amplifier 1C is the output terminal of the LED current detection circuit 5 and is connected to the wireless control module M1. The difference between the voltages from the two ends of the sampling resistor R11 connected in series with the LED load 6 to the ground can be detected, the voltage value on the sampling resistor R11 can be obtained according to the difference between the voltages from the two ends of the sampling resistor R11 to the ground, the voltage value can be divided by the resistance value of the sampling resistor R11 to obtain the current value flowing through the LED load 6, specifically, the detected voltage at one end of the sampling resistor R11 is 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, signal isolation is carried out before and after the voltage is divided, the voltage output by the output ends of the first operational amplifier 1A and the second operational amplifier 1B is input to the third operational amplifier 1C, and the difference between the two voltages can be obtained after the third operational amplifier 1C, the difference value can reflect the voltage value at the two ends of the sampling resistor R11, and further can reflect the current on the sampling resistor R11, that is, the current value flowing through the LED load 6, and the difference value is output to the wireless control module M1, so that the brightness change condition after dimming is truly reflected on the wireless communication device through 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, and the wireless smart dimming may be reset to the wireless smart non-dimming state by 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 smart dimming, the 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 the voltage input to the wireless control module M1 conforms to the logic set by the wireless control module M1, the wireless control module M1 outputs a specific dimming value (generally, a maximum value) to the constant current circuit 32, so that the wireless smart dimming is reset to the wireless smart non-dimming state, if a voltage of 0.5V or 2V can be set in the wireless control module M1, when the voltage input into the wireless control module M1 after the input voltage of the triac dimmer 1 is divided by the triac dimmer detection circuit 2 is less than 0.5V or greater than 2V, the wireless control module M1 outputs a maximum value to the constant current circuit 32, so that the wireless intelligent dimming is reset to the wireless intelligent non-dimming state.
In the present embodiment, the rectifier circuit BD1 employs a conventional rectifier stack, i.e., is composed of four diodes; the silicon controlled dimmer detection circuit 2 adopts the prior art, and a circuit diagram is shown in figure 1; the bleeder circuit 31 adopts the prior art, the circuit diagram is shown in fig. 1, and the model number of the control chip U1 in fig. 1 is BP 5178; the constant current circuit 32 adopts the prior art, the circuit diagram is shown in fig. 1, and the model number of the constant current control chip U2 in fig. 1 is BP5711 EJ; the constant voltage power supply circuit 41 adopts the prior art, the circuit diagram is shown in fig. 1, the model of a constant voltage chip U3 in fig. 1 is KP15012, and the model of a linear voltage regulation chip U4 is ME6118a33M 3G.
A method for realizing LED current detection and dimming by the hybrid dimming driving circuit comprises the following specific processes:
when the silicon controlled dimmer 1 is used for dimming, the current on the LED load 6 can change along with the voltage change input by the silicon controlled dimmer 1; the LED current detection circuit 5 divides the detected voltage at one end of the sampling resistor R11 and inputs the divided voltage to the first operational amplifier 1A, divides the detected voltage at the other end of the sampling resistor R11 and inputs the divided voltage to the second operational amplifier 1B, the voltages output by the first operational amplifier 1A and the second operational amplifier 1B are input to the third operational amplifier 1C, the third operational amplifier 1C outputs a difference value between the voltage output by the first operational amplifier 1A and the voltage output by the second operational amplifier 1B, the difference value reflects the voltage at two ends of the sampling resistor R11, and the voltage at two ends of the sampling resistor R11 is divided by the resistance value of the sampling resistor R11 itself to obtain a current value 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, thereby truly reflecting the dimming condition of the triac dimmer 1 on the wireless communication device.
When wireless intelligent dimming is performed, the wireless control module M1 receives a dimming value through wireless communication equipment in advance, the wireless control module M1 outputs a variation value with small current variation 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 variation value; the LED current detection circuit 5 divides the detected voltage at one end of the sampling resistor R11 and inputs the divided voltage to the first operational amplifier 1A, divides the detected voltage at the other end of the sampling resistor R11 and inputs the divided voltage to the second operational amplifier 1B, the voltages output by the first operational amplifier 1A and the second operational amplifier 1B are input to the third operational amplifier 1C, the third operational amplifier 1C outputs a difference value between the voltage output by the first operational amplifier 1A and the voltage output by the second operational amplifier 1B, the difference value reflects the voltage at two ends of the sampling resistor R11, and the voltage at two ends of the sampling resistor R11 is divided by the resistance value of the sampling resistor R11 itself 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 input current value with the dimming value, if the input current value does not reach the dimming value, the wireless control module M1 outputs a change value with small current change to the constant current circuit 32 again, until the current value output to the wireless control module M1 by the LED current detection circuit 5 is equal to or close to the dimming value, the wireless control module M1 stops outputting to the constant current circuit 32, the wireless control module M1 approaches the dimming value by outputting the change value with small current change, and therefore wireless intelligent dimming is achieved. The time from the reception of the dimming value of the wireless communication apparatus to the completion of the adjustment of the luminance is generally less than 1 second by the wireless control module M1.
Claims (5)
1. A mixed dimming drive circuit comprises a silicon controlled dimmer, a rectifying circuit, a silicon controlled dimmer detection circuit, a silicon controlled dimming constant current circuit and a wireless control circuit, wherein the input end of the silicon controlled dimmer is connected with mains supply, the output end of the silicon controlled 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 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 dimming constant current circuit is connected with the input end of an LED load, the silicon controlled dimming constant current circuit adopts an analog dimming control mode to dim the LED load, the silicon controlled dimmer detection circuit is connected to the input end or the output end of the rectifying circuit and is used for detecting the phase change or the voltage change of the silicon controlled dimmer, the output end of the wireless control circuit is connected with the silicon controlled rectifier dimming constant current circuit, the wireless control circuit is connected with the silicon controlled rectifier dimmer detection circuit, and the wireless control circuit is 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 the LED load in series in real time to obtain a current value flowing through the LED load, and feeds the current value back to the wireless control circuit so as to truly reflect the dimming change condition of the whole lamp on the wireless communication equipment.
2. The hybrid dimming driving circuit of claim 1, wherein: the silicon controlled light dimming constant current circuit consists of a first isolating diode used for isolating the silicon controlled light dimming constant current circuit from the rectifying circuit and the silicon controlled light dimmer detection circuit connected to the input end of the rectifying circuit, a bleeder circuit used for providing a maintaining current for the silicon controlled light dimmer when the silicon controlled light is dimmed, and a constant current circuit used for providing a constant current for the LED load and dimming the LED load by adopting an analog dimming control mode so as to ensure that the LED load does not flicker in the light dimming process, the anode of the first isolation diode is connected with the output end of the rectifying circuit, the cathode of the first isolation diode is connected with the input end of the bleeder circuit, the discharge 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 of claim 2, wherein: the wireless control circuit consists of a second isolating diode used for isolating the wireless control circuit 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 supply circuit used for providing constant voltage for the wireless control module so as to enable the wireless control module to normally work, wherein the anode of the second isolating diode is connected with the output end of the rectifying circuit, the cathode of the second isolating diode is connected with the input end of the constant voltage supply circuit, the output end of the constant voltage supply circuit is connected with the power supply end of the wireless control module, and the output end of the wireless control module is connected with the constant current circuit, the wireless control module is respectively connected with the output ends of the silicon controlled dimmer detection circuit and the LED current detection circuit, and the LED current detection circuit feeds back current which is obtained in real time and flows through the LED load to the wireless control module.
4. The hybrid dimming driving circuit of claim 3, wherein: the LED current detection circuit consists 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 non-inverting 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 non-inverting input end of the second operational amplifier through a fourteenth resistor, the common end of the twelfth resistor, which is connected with the non-inverting input end of the first operational amplifier, is grounded through a thirteenth resistor and a second capacitor which are connected in parallel, the common end of the fourteenth resistor, which is connected with the non-inverting 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 output end of the first operational amplifier is connected with the non-inverting input end of the third operational amplifier through a seventeenth resistor, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier is connected with the inverting input end of the third operational amplifier through an eighteenth resistor, the common end of the eighteenth resistor connected with the inverting input end of the third operational amplifier is grounded through a nineteenth resistor, the non-inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier through a sixteenth resistor, and the output end of the third operational amplifier is the output end of the LED current detection circuit and the non-inverting input end of the LED current detection circuit The line control module is connected.
5. A method for implementing LED current detection and dimming using the hybrid dimming driving circuit of claim 4, wherein there is a sampling resistor connected in series with the LED load, a voltage value across the sampling resistor is obtained by measuring a difference between two ends of the sampling resistor and a ground voltage, and the voltage value across the sampling resistor is divided by a resistance value of the sampling resistor itself to obtain a current value flowing through the LED load, and the method comprises the following specific processes:
when the silicon controlled dimmer is used for dimming, the current on the LED load can change along with the change of the voltage input by the silicon controlled dimmer; the LED current detection circuit divides the voltage of one end of the detected sampling resistor and then inputs the voltage into a first operational amplifier, divides the voltage of the other end of the detected sampling resistor and then inputs the voltage into a second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input into a third operational amplifier, the third operational amplifier outputs the difference value of the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltage at the two ends of the sampling resistor, and the voltage at the two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through the LED load; the LED current detection circuit outputs the 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 wireless intelligent dimming is carried out, the wireless control module receives a dimming value through wireless communication equipment in advance, the wireless control module outputs a change value with small 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 of one end of the detected sampling resistor and then inputs the voltage into a first operational amplifier, divides the voltage of the other end of the detected sampling resistor and then inputs the voltage into a second operational amplifier, the voltages output by the first operational amplifier and the second operational amplifier are respectively input into a third operational amplifier, the third operational amplifier outputs the difference value of the voltage output by the first operational amplifier and the voltage output by the second operational amplifier, the difference value reflects the voltage at the two ends of the sampling resistor, and the voltage at the two ends of the sampling resistor is divided by the resistance value of the sampling resistor to obtain the current value flowing through the LED load; the LED current detection circuit outputs a current value flowing through an LED load to the wireless control module, the wireless control module compares the input current value with a dimming value, if the input current value does not reach the dimming value, the wireless control module outputs a change value with small current change to the constant current circuit, the wireless control module stops outputting the change value to the constant current circuit until the current value output to the wireless control module by the LED current detection circuit is equal to or close to the dimming value, and the wireless control module approaches the dimming value by outputting the change value with small current change, so that wireless intelligent dimming is realized.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112020190A (en) * | 2020-08-07 | 2020-12-01 | 浙江阳光美加照明有限公司 | Intelligent illumination control method |
| CN115734428A (en) * | 2022-12-28 | 2023-03-03 | 威海中远海运重工科技有限公司 | Constant-power stepless dimming control system |
| CN117479371A (en) * | 2023-12-26 | 2024-01-30 | 南昌英诺泰克科技有限公司 | Improved intelligent dimming control device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205883641U (en) * | 2016-07-08 | 2017-01-11 | 深圳市明微电子股份有限公司 | Linear constant current circuit who adjusted luminance in full stroke phase cut angle based on triac dimmer |
| CN109041348A (en) * | 2018-08-31 | 2018-12-18 | 厦门市必易微电子技术有限公司 | Adaptive circuit module, the LED drive circuit with controllable silicon dimmer and method |
| CN110099489A (en) * | 2019-05-14 | 2019-08-06 | 浙江阳光美加照明有限公司 | It is a kind of it is compatible silicon controlled light modulation and Wireless Light modulating driving circuit |
| CN110505733A (en) * | 2019-08-14 | 2019-11-26 | 深圳市晟碟半导体有限公司 | LED control circuit, device and the control method of compatible silicon controlled light modulator |
| CN211321572U (en) * | 2019-12-03 | 2020-08-21 | 浙江阳光美加照明有限公司 | Hybrid dimming driving circuit |
-
2019
- 2019-12-03 CN CN201911217010.XA patent/CN111010767B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205883641U (en) * | 2016-07-08 | 2017-01-11 | 深圳市明微电子股份有限公司 | Linear constant current circuit who adjusted luminance in full stroke phase cut angle based on triac dimmer |
| CN109041348A (en) * | 2018-08-31 | 2018-12-18 | 厦门市必易微电子技术有限公司 | Adaptive circuit module, the LED drive circuit with controllable silicon dimmer and method |
| CN110099489A (en) * | 2019-05-14 | 2019-08-06 | 浙江阳光美加照明有限公司 | It is a kind of it is compatible silicon controlled light modulation and Wireless Light modulating driving circuit |
| CN110505733A (en) * | 2019-08-14 | 2019-11-26 | 深圳市晟碟半导体有限公司 | LED control circuit, device and the control method of compatible silicon controlled light modulator |
| CN211321572U (en) * | 2019-12-03 | 2020-08-21 | 浙江阳光美加照明有限公司 | Hybrid dimming driving circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112020190A (en) * | 2020-08-07 | 2020-12-01 | 浙江阳光美加照明有限公司 | Intelligent illumination control method |
| CN112020190B (en) * | 2020-08-07 | 2023-03-14 | 浙江阳光美加照明有限公司 | Intelligent illumination control method |
| CN115734428A (en) * | 2022-12-28 | 2023-03-03 | 威海中远海运重工科技有限公司 | Constant-power stepless dimming control system |
| CN115734428B (en) * | 2022-12-28 | 2024-05-31 | 威海中远海运重工科技有限公司 | Constant-power electrodeless dimming control system |
| CN117479371A (en) * | 2023-12-26 | 2024-01-30 | 南昌英诺泰克科技有限公司 | Improved intelligent dimming control device |
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