CN110035584B - LED dimming circuit, dimming device and dimming method for improving dimming precision - Google Patents
LED dimming circuit, dimming device and dimming method for improving dimming precision Download PDFInfo
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Abstract
The invention discloses an LED dimming circuit, a dimming device and a dimming method for improving dimming precision, wherein the LED dimming circuit for improving dimming precision comprises a voltage division module, a multi-path selection module, an adjusting module and a constant current source module, wherein the voltage division module divides reference voltage output by a direct current stabilized power supply and then outputs corresponding voltage signals to the multi-path selection module through different taps; the multipath selection module outputs a control signal to the adjustment module according to the received dimming data, and outputs a voltage signal output by a tap corresponding to the voltage division module to the constant current source module; and the constant current source module controls the current flowing through the LED lamp string according to the currently received voltage signal. The invention can effectively improve the light modulation precision of the LED through the design of a simple circuit structure, simplifies the circuit structure and reduces the realization cost.
Description
Technical Field
The present invention relates to the field of LED technologies, and in particular, to an LED dimming circuit, a dimming device, and a dimming method for improving dimming accuracy.
Background
The output of the LED driving power supply is a constant current source, different power supply values correspond to different light source brightness, as shown in fig. 1, the LED dimming is realized by changing the reference voltage Vset of the constant current source, the reference voltage Vset is tapped from different taps of the resistor string, when the dimming precision is increased by 1bit, the number of resistors, the number of switches and the decoding circuit are doubled, namely, the original dimming precision of 2 system 6 bits is assumed, the dimming circuit has 64 brightness levels in total, 63 resistors with R1-R63 connected in series are needed, and 64 switches K0-K63 are needed, if the precision is increased to 8 bits, 255 resistors and 256 switches are needed in the traditional method, so that the circuit structure is complex, and the realization cost is greatly increased.
There is thus a need for improvements and improvements in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an LED dimming circuit, a dimming device and a dimming method for improving dimming accuracy, which can greatly improve the dimming accuracy of an LED by a simple circuit structure design, simplify the circuit structure, and reduce the implementation cost.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The LED dimming circuit for improving dimming precision comprises a voltage division module, a multi-path selection module, an adjusting module and a constant current source module, wherein the voltage division module divides reference voltage output by a direct current stabilized power supply and outputs corresponding voltage signals to the multi-path selection module through different taps; the multipath selection module outputs a control signal to the adjustment module according to the received dimming data, and outputs a voltage signal output by a tap corresponding to the voltage division module to the constant current source module; and the constant current source module controls the current flowing through the LED lamp string according to the currently received voltage signal.
In the LED dimming circuit for improving the dimming precision, the voltage dividing module comprises a resistor string, the resistor string is formed by connecting a plurality of voltage dividing resistors in series, the upper end of the resistor string is connected with a direct-current stabilized power supply or is connected with the direct-current stabilized power supply through the regulating module, and the lower end of the resistor string is grounded through the regulating module; and the lower end tap of each voltage dividing resistor is respectively led out and connected with the multi-path selection module.
In the LED dimming circuit for improving the dimming precision, the adjusting module is specifically configured to adjust the voltage dividing ratio of the voltage dividing module according to the control signal, so as to adjust the magnitude of the voltage signal output by the corresponding tap.
In the LED dimming circuit for improving dimming precision, the adjusting module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch; one end of the first resistor and a first connecting end of the first switch are connected with a direct-current voltage-stabilizing power supply, the other end of the first resistor and a second connecting end of the first switch are connected with one end of the second resistor and a first connecting end of the second switch, the other end of the second resistor and a second connecting end of the second switch are connected with one end of the third resistor and a first connecting end of the third switch, the other end of the third resistor and a second connecting end of the third switch are connected with the voltage-dividing module, and a control end of the first switch, a control end of the second switch and a control end of the third switch are connected with a multiplexing module; one end of the fourth resistor and a first connecting end of the fourth switch are connected with the voltage dividing module, the other end of the fourth resistor and a second connecting end of the fourth switch are both connected with one end of the fifth resistor and the first connecting end of the fifth switch, the other end of the fifth resistor and the second connecting end of the fifth switch are both connected with one end of the sixth resistor and the first connecting end of the sixth switch, and the other end of the sixth resistor and the second connecting end of the sixth switch are both grounded; the control end of the fourth switch, the control end of the fifth switch and the control end of the sixth switch are all connected with the multi-path selection module.
In the LED dimming circuit for improving dimming precision, the adjusting module includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch; one end of the seventh resistor, the first connecting end of the seventh switch, the first connecting end of the eighth switch and the first connecting end of the ninth switch are all connected with a direct-current stabilized voltage supply, the other end of the seventh resistor and the second connecting end of the seventh switch are all connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the ninth resistor and the second connecting end of the eighth switch, the other end of the ninth resistor is connected with the second connecting end of the ninth switch and the voltage dividing module, and the control end of the seventh switch, the control end of the eighth switch and the control end of the ninth switch are all connected with the multiplexing module; one end of a tenth resistor and a first connecting end of a tenth switch are connected with the voltage dividing module, the other end of the tenth resistor is connected with one end of an eleventh resistor and the first connecting end of the eleventh switch, the other end of the eleventh resistor is connected with one end of the twelfth resistor and the first connecting end of the twelfth switch, and the other end of the twelfth resistor, a second connecting end of the tenth switch, a second connecting end of the eleventh switch and a connecting end of the twelfth switch are all grounded; the control end of the tenth switch, the control end of the eleventh switch and the control end of the twelfth switch are all connected with the multi-path selection module.
In the LED dimming circuit for improving dimming precision, the adjusting module includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a thirteenth switch, a fourteenth switch, a fifteenth switch and a sixteenth switch; one end of the thirteenth resistor and a first connecting end of the thirteenth switch are connected with a direct-current stabilized power supply, the other end of the thirteenth resistor and a second connecting end of the thirteenth switch are connected with one end of the fourteenth resistor and a first connecting end of the fourteenth switch, the other end of the fourteenth resistor and a second connecting end of the fourteenth switch are connected with the voltage division module, and a control end of the thirteenth switch and a control end of the fourteenth switch are connected with a multiplexing selection module; one end of the fifteenth resistor and a first connecting end of the fifteenth switch are connected with the voltage dividing module, the other end of the fifteenth resistor and a second connecting end of the fifteenth switch are both connected with one end of the sixteenth resistor and the first connecting end of the sixteenth switch, and the other end of the sixteenth resistor and the second connecting end of the sixteenth switch are both grounded; the control end of the fifteenth switch and the control end of the sixteenth switch are both connected with the multipath selection module.
In the LED dimming circuit for improving dimming precision, the adjusting module includes a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a seventeenth switch, an eighteenth switch and a nineteenth switch; one end of the seventeenth resistor and a first connecting end of the seventeenth switch are connected with the voltage dividing module, the other end of the seventeenth resistor and a second connecting end of the seventeenth switch are connected with one end of the eighteenth resistor and a first connecting end of the eighteenth switch, the other end of the eighteenth resistor and the second connecting end of the eighteenth switch are connected with one end of the nineteenth resistor and the first connecting end of the nineteenth switch, and the other end of the nineteenth resistor and the second connecting end of the nineteenth switch are grounded; the control end of the seventeenth switch, the control end of the eighteenth switch and the control end of the nineteenth switch are all connected with the multi-path selection module.
In the LED dimming circuit for improving the dimming precision, the multipath selection module comprises a plurality of switches with the number corresponding to that of the divider resistors, one end of each switch is correspondingly connected with a lower end tap of one divider resistor, the other end of each switch is connected with the constant current source module, and the control end of each switch is connected with the input end of dimming data.
An LED dimming method for improving dimming precision comprises the following steps:
the voltage dividing module divides the reference voltage output by the direct-current stabilized power supply and outputs corresponding voltage signals to the multiple-path selection module through different taps;
the multipath selection module outputs a control signal to the adjustment module according to the received dimming data, and outputs a voltage signal output by a tap corresponding to the voltage division module to the constant current source module;
the voltage signal output by the corresponding tap is adjusted by the adjusting module according to the control signal;
the constant current source module controls the current flowing through the LED lamp string according to the current received voltage signal.
The LED dimming device comprises a shell, wherein a PCB is arranged in the shell, and the LED dimming circuit for improving the LED dimming precision is arranged on the PCB.
Compared with the prior art, the LED dimming circuit, the dimming device and the dimming method for improving the dimming precision provided by the invention have the advantages that the LED dimming circuit for improving the dimming precision comprises a voltage division module, a multi-path selection module, an adjusting module and a constant current source module, and the voltage division module divides the reference voltage output by the direct-current stabilized power supply and outputs corresponding voltage signals to the multi-path selection module through different taps; the multipath selection module outputs a control signal to the adjustment module according to the received dimming data, and outputs a voltage signal output by a tap corresponding to the voltage division module to the constant current source module; and the constant current source module controls the current flowing through the LED lamp string according to the currently received voltage signal. The invention can effectively improve the light modulation precision of the LED through the design of a simple circuit structure, simplifies the circuit structure and reduces the realization cost.
Drawings
Fig. 1 is a circuit diagram of an LED dimming circuit in the prior art.
Fig. 2 is a block diagram of an LED dimming circuit for improving LED dimming accuracy according to the present invention.
Fig. 3 is a circuit diagram of a first preferred embodiment of an LED dimming circuit for improving LED dimming accuracy according to the present invention.
Fig. 4 is a circuit diagram of a second preferred embodiment of the LED dimming circuit for improving LED dimming accuracy according to the present invention.
Fig. 5 is a circuit diagram of a third preferred embodiment of the LED dimming circuit for improving LED dimming accuracy according to the present invention.
Fig. 6 is a circuit diagram of a fourth preferred embodiment of the LED dimming circuit for improving LED dimming accuracy according to the present invention.
Fig. 7 is a flowchart of an LED dimming method for improving LED dimming accuracy.
Detailed Description
The invention aims to provide an LED dimming circuit, a dimming device and a dimming method for improving dimming precision, which can greatly improve the LED dimming precision through the design of a simple circuit structure, simplify the circuit structure and reduce the implementation cost.
In order to make the objects, technical solutions and effects of the present invention clearer and more specific, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 2, the LED dimming circuit for improving dimming precision provided by the present invention is connected to an LED string, and includes a dc stabilized power supply 100, a rectifying module 200, a voltage dividing module 300, a multiplexing module 400, an adjusting module 500, and a constant current source module 600, wherein an input end of the rectifying module 200 inputs ac, the dc stabilized power supply 100 outputs a reference voltage, the dc stabilized power supply 100 is connected to the voltage dividing module 300 through the adjusting module 500, the rectifying module 200 is connected to the LED string, the voltage dividing module 300 respectively leads out a plurality of taps to be connected to the multiplexing module 400, and the multiplexing module 400 is also connected to a control end and a dimming data input end of the constant current source module 600.
The invention outputs the reference voltage through the direct-current stabilized power supply 100, the voltage division module 300 divides the reference voltage output by the direct-current stabilized power supply 100 and outputs corresponding voltage signals to the multi-path selection module 400 through different taps; the multiplexing module 400 outputs a control signal to the adjusting module 500 according to the received dimming data, and outputs a voltage signal output by the tap corresponding to the voltage dividing module 300 to the constant current source module 600; the adjusting module 500 adjusts the voltage signal output by the corresponding tap according to the control signal, the constant current source module 600 controls the current flowing through the LED string light according to the currently received voltage signal, that is, the multi-path selecting module 400 selects the voltage of one path of tap according to the dimming data to output to the constant current source module 600 as the reference voltage of the dimming, wherein the adjusting module 500 can flexibly adjust the voltage signal output by the corresponding tap according to the control signal, thereby controlling the current flowing through the LED string light, so as to realize accurate adjustment of the brightness of the LED string light, and the circuit has simple structural design, convenient operation and less realization cost.
In specific implementation, the voltage dividing module 300 includes a resistor string, where the resistor string is formed by connecting a plurality of voltage dividing resistors in series, as shown in R1, R2, and Rn, where the number of specific voltage dividing resistors can be selected according to the actual dimming requirement, and the invention is not limited thereto, and the upper end of the resistor string is connected to the dc regulated power supply 100 or connected to the dc regulated power supply 100 through the adjusting module 500, and the lower end of the resistor string is grounded through the adjusting module 500; the lower end tap of each voltage dividing resistor is led out and connected with the multi-path selection module 400 respectively, namely the invention divides the reference voltage of the direct current stabilized power supply 100 through a plurality of voltage dividing resistors, the lower end tap of each voltage dividing resistor outputs different voltage signals, and the multi-path selection module 400 selects the voltage signals output to the constant current source module 600 by controlling the on and off of each path of tap, thereby realizing dimming control.
Further, the adjusting module 500 is specifically configured to adjust the voltage division ratio of the voltage division module 300 according to the control signal, so as to adjust the magnitude of the voltage signal output by the corresponding tap, the adjusting module 500 is connected with the voltage division module 300 and the multiple selection module 400, and the multiple selection module 400 controls the adjusting module 500 to adjust the voltage division ratio of the voltage division module 300 according to the dimming data, so as to flexibly adjust the magnitude of the voltage signal, and improve the dimming precision of the LED.
Referring to fig. 3, in a first preferred embodiment of the present invention, the adjusting module 500 includes a first resistor Rh1, a second resistor Rh2, a third resistor Rh3, a fourth resistor Rl1, a fifth resistor Rl2, a sixth resistor Rl3, a first switch Kh1, a second switch Kh2, a third switch Kh3, a fourth switch Kl1, a fifth switch Kl2, a sixth switch Kl3, a first inverter U1, a second inverter U2, and a third inverter U3; one end of the first resistor Rh1 and a first connection end of the first switch Kh1 are both connected with the direct-current stabilized power supply 100, the other end of the first resistor Rh1 and a second connection end of the first switch Kh1 are connected with one end of the second resistor Rh2 and a first connection end of the second switch Kh2, the other end of the second resistor Rh2 and a second connection end of the second switch Kh2 are both connected with one end of the third resistor Rh3 and a first connection end of the third switch Kh3, the other end of the third resistor Rh3 and a second connection end of the third switch Kh3 are both connected with the voltage division module 300, a control end of the first switch Kh1 is connected with an output end of the first inverter U1, a control end of the second switch Kh2 is connected with an output end of the second inverter U2, a control end of the third switch Kh3 is connected with an output end of the third inverter U3, and an input end of the first inverter U1, a second inverter U2 and an input end of the third inverter U3 are both connected with a multi-channel selection module 400; one end of the fourth resistor Rl1 and the first connection end of the fourth switch Kl1 are connected with the voltage dividing module 300, the other end of the fourth resistor Rl1 and the second connection end of the fourth switch Kl1 are both connected with one end of the fifth resistor Rl2 and the first connection end of the fifth switch Kl2, the other end of the fifth resistor Rl2 and the second connection end of the fifth switch Kl2 are both connected with one end of the sixth resistor Rl3 and the first connection end of the sixth switch Kl3, and the other end of the sixth resistor Rl3 and the second connection end of the sixth switch Kl3 are both grounded; the control end of the fourth switch Kl1, the control end of the fifth switch Kl2 and the control end of the sixth switch Kl3 are all connected with the multi-path selection module 400; preferably, an inverter is connected between the first switch Kh1 and the fourth switch Kl1 and the second switch Kh2 and the fifth switch Kl2, and between the third switch Kh3 and the sixth switch Kl3, respectively, so that the control signals of the first switch Kh1, the second switch Kh2 and the third switch Kh3 are the inverse of the control signals of the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3, although in other embodiments, circuit devices with the same function may be used, which is not limited by the present invention.
In this embodiment, the adjustment of the brightness of the LED is explained by using 63 voltage dividing resistors, and the number of the voltage dividing resistors can be adjusted as required in other embodiments. In this embodiment, on the basis of 64 switches of the original 63 resistors, only 3 fine tuning resistors with resistance value of 1/4R are added, namely, a fourth resistor Rl1, a fifth resistor Rl2 and a sixth resistor Rl3,3 compensation resistors with resistance value of 1/4R are respectively a first resistor Rh1, a second resistor Rh2 and a third resistor Rh3, and 6 switches which are respectively connected in parallel with the resistors, namely, a fourth switch Kl1, a fifth switch Kl2, a sixth switch Kl3, a first switch Kh1, a second switch Kh2 and a third switch Kh3, so that 69 resistors are generally used, and 70 switches can realize 8bit dimming precision. Wherein R refers to the resistance of a single voltage dividing resistor in the resistor string.
Further, in this embodiment, the multiplexing module 400 includes a plurality of switches corresponding to the voltage dividing resistors, as shown in K0, K1, i.e., K62, K63 in fig. 3, one end of each switch is correspondingly connected to a lower end tap of one voltage dividing resistor, the other end of each switch is connected to the constant current source module 600, the control end of each switch is connected to the input end of the dimming data, and the switches may be implemented by a relay, a triode, a MOSFET, a transmission gate, and the like.
Still further, the multiple-path selection module 400 further includes a switch encoder 410, wherein an input end of the switch encoder 410 is connected to an input end of the dimming data, and a plurality of output ends of the switch encoder 410 are correspondingly connected to a control end of each switch. That is, the switch encoder 410 receives the dimming data and converts the dimming data into control signals for controlling the switches to be turned on so as to realize dimming, and meanwhile, outputs the control signals to the adjusting module 500 to control the switches in the adjusting module 500 to be turned on so as to improve the dimming precision of the LED.
In particular, the dimming data is typically a binary code, but may also be a PWM signal or other signal, and typically the brightness of the LED increases as the current flowing through the LED increases, decreases as the current flowing through the LED decreases, and approaches a linear relationship. In this embodiment, the dimming data is explained as a binary code. If 8bit dimming accuracy is to be achieved, the brightness is typically represented by 0xFF (decimal number 255) of 100%, i.e. the current through the LED is the maximum value set by the system; 0x00 represents 0% brightness, and the LED has no current path, namely is extinguished; 0x01 represents a 1/255 brightness of about 0.39%, and the current through the LED is 0.39% of the maximum current; 0x02 represents a 2/255 brightness of about 0.78%; and so on, 0.39% of the current is increased every 1 stage.
In this embodiment, after the low-order 2bit of the dimming data is encoded, the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 are controlled to be turned on, and the control signals of the first switch Kh1, the second switch Kh2 and the third switch Kh3 are the reverse directions of the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl 3; the high-order 6bit of the dimming data is coded and then the switches K0-K63 are controlled to be closed, and the high-order 6bit of the dimming data is specifically coded by a single thermal code, for example 000 is coded into 00001;001 and 010 are both encoded to 00010;011 and 100 are both encoded to 00100;101 and 110 are both encoded to 01000;111 is encoded to 10000.
When the low-order 2bit of the dimming data is 00, the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 are all turned on, and the first switch Kh1, the second switch Kh2 and the third switch Kh3 are all turned off; when the low-order 2bit of the dimming data is 01, 2 of the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 are turned on, and correspondingly, 2 of the first switch Kh1, the second switch Kh2 and the third switch Kh3 are turned off; when the low-order 2bit of the dimming data is 10, 1 of the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 is turned on, and correspondingly, 1 of the first switch Kh1, the second switch Kh2 and the third switch Kh3 is turned off; when the low level 2bit of the dimming data is 11, the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 are all turned off, and the first switch Kh1, the second switch Kh2 and the third switch Kh3 are all turned on.
If the dimming data of 8bit dimming precision is 0x00, the high-order 6bit binary number is 000000, the low-order 2bit binary number is 00, so that K0 is on, K1-K63 are off, the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 are all on, the first switch Kh1, the second switch Kh2 and the third switch Kh3 are all off, the reference voltage vset=0v output to the constant current source module 600, the output current iled=vset/rcs=0a, that is, the LED is off. If the dimming data with 8bit dimming precision is 0x7a (the binary number is 01111010, the decimal number is 122), the high-order 6bit binary number is 01110 (the decimal number is 30), the low-order 2bit binary number is 10, and therefore the switch K30 is turned on, the switches K0-K29 and the switches K31-K63 are turned off, the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 have 1 conduction assumption that the fourth switch Kl1 is turned on, the fourth resistor Rl1 is short-circuited, the first switch Kh1, the second switch Kh2 and the third switch Kh3 have 1 disconnection assumption that the first switch Kh1 is turned off, the second resistor Rh2 and the third resistor Rh3 are short-circuited, and the reference voltage output to the constant current source module 600
Output current iled=122 Vref/255Rcs. If the dimming data with 8bit dimming precision is 0xff, the high-order 6bit binary number is 111111, the low-order 2bit binary number is 11, so that the switch K63 is turned on, the switches K0-K62 are turned off, the fourth switch Kl1, the fifth switch Kl2 and the sixth switch Kl3 are all turned off, the first switch Kh1, the second switch Kh2 and the third switch Kh3 are all turned on, the reference voltage Vset=Vref output to the constant current source module 600, the output current Iled=Vref/Rcs, namely the maximum brightness of the LED, namely the connection state of the resistor in the adjusting module 500 is controlled by the control signal, and the voltage dividing proportion of the resistor string in the voltage dividing module 300 can be effectively adjusted, so that the reference voltage of the constant current source module 600 is changed, the current Iled flowing through the LED can be changed, and the dimming precision of the LED dimming circuit is improved.
Further, referring to fig. 4, in a second preferred embodiment of the present invention, the adjusting module 500 includes a seventh resistor Rh10, an eighth resistor Rh20, a ninth resistor Rh30, a tenth resistor Rl10, an eleventh resistor Rl20, a twelfth resistor Rl30, a seventh switch Kh10, an eighth switch Kh20, a ninth switch Kh30, a tenth switch Kl10, an eleventh switch Kl20, and a twelfth switch Kl30; one end of the seventh resistor Rh10, the first connection end of the seventh switch Kh10, the first connection end of the eighth switch Kh20 and the first connection end of the ninth switch Kh30 are all connected with the direct-current stabilized power supply 100, the other end of the seventh resistor Rh10 and the second connection end of the seventh switch Kh10 are all connected with one end of the eighth resistor Rh20, the other end of the eighth resistor Rh20 is connected with one end of the ninth resistor Rh20 and the second connection end of the eighth switch Kh20, the other end of the ninth resistor Rh30 is connected with the second connection end of the ninth switch Kh30 and the voltage division module 300, and the control end of the seventh switch Kh10, the control end of the eighth switch Kh20 and the control end of the ninth switch Kh30 are all connected with the multiplexing module 400; one end of a tenth resistor Rl10 and a first connection end of a tenth switch Kl10 are connected with the voltage dividing module 300, the other end of the tenth resistor Rl10 is connected with one end of an eleventh resistor Rl20 and the first connection end of the eleventh switch Kl20, the other end of the eleventh resistor Rl20 is connected with one end of a twelfth resistor Rl30 and the first connection end of the twelfth switch Kl30, and the other end of the twelfth resistor Rl30, the second connection end of the tenth switch Kl10, the second connection end of the eleventh switch Kl20 and the connection end of the twelfth switch Kl30 are all grounded; the control end of the tenth switch Kl10, the control end of the eleventh switch Kl20 and the control end of the twelfth switch Kl30 are all connected with the multiplexing module 400.
Compared with the first preferred embodiment, the present embodiment also uses 69 resistors and 70 switches to achieve 8-bit dimming precision adjustment, but changes the connection modes of the fine adjustment resistor and the compensation resistor in the adjustment module 500 and the corresponding switches thereof, that is, the seventh resistor Rh10, the eighth resistor Rh20 and the ninth resistor Rh30 are compensation resistors with resistance values of 1/4R, and the tenth resistor Rl10, the eleventh resistor Rl20 and the twelfth resistor Rl30 are compensation resistors with resistance values of 1/4R, so that in this embodiment, no matter how many bits of the fine adjustment resistor are, only 2 switches are connected in series with the resistor string at most. The low-order 2bit of the dimming data is coded and then controls the closing of a seventh switch Kh10, an eighth switch Kh20, a ninth switch Kh30, a tenth switch Kl10, an eleventh switch Kl20 and a twelfth switch Kl 30; and after the high-order 6bit of the dimming data is coded, the switches K0-K63 are controlled to be closed.
Specifically, when the low-order 2bit of the dimming data is 00, the tenth switch Kl10 is turned on, and the seventh switch Kh10, the eighth switch Kh20, the ninth switch Kh30, the eleventh switch Kl20, and the twelfth switch Kl30 are all turned off; when the low-order 2bit of the dimming data is 01, the eleventh resistor Rl20 and the seventh switch Kh10 are turned on, and the tenth switch Kl10, the twelfth switch Kl30, the eighth switch Kh20 and the ninth switch Kh30 are all turned off; when the low-order 2bit of the dimming data is 10, the twelfth switch Kl30 and the eighth switch Kh20 are turned on, and the tenth switch Kl10, the eleventh switch Kl20, the seventh switch Kh10 and the ninth switch Kh30 are all turned off; when the low-order 2bit of the dimming data is 11, the ninth switch Kh30 is turned on, and the tenth switch Kl10, the eleventh switch Kl20, the twelfth switch Kl30, the seventh switch Kh10, and the eighth switch Kh20 are all turned off.
If the dimming data of 8bit dimming precision is 0x00, the high-order 6bit binary number is 000000, the low-order 2bit binary number is 00, so that the switch K0 is turned on, the switches K1-K63 are turned off, the tenth switch Kl10 is turned on, and the seventh switch Kh10, the eighth switch Kh20, the ninth switch Kh30 and the eleventh switch are turned onBoth Kl20 and twelfth switch Kl30 are turned off, the reference voltage vset=0v output to the constant current source module 600, the output current iled=vset/rcs=0a, i.e., LED is turned off; if the dimming data with 8bit dimming precision is 0x7a (the binary number is 01111010, the decimal number is 122), the high-order 6bit binary number is 01110, the low-order 2bit binary number is 10, and therefore the switch K30 is turned on, the switches K0-K29 and the switches K31-K63 are turned off, the twelfth switch Kl30 and the eighth switch Kh20 are turned on, the tenth switch Kl10, the eleventh switch Kl20, the seventh switch Kh10 and the ninth switch Kh30 are all turned off, the twelfth switch Kl30 is shorted by the twelfth switch Kl30, the seventh resistor Rh10 and the eighth resistor Rh20 are shorted by the eighth switch Kh20, and the reference voltage output to the constant current source module 600
Output current iled=122 Vref/255Rcs; if the dimming data with 8bit dimming precision is 0xff, the high-order 6bit binary number is 111111, the low-order 2bit binary number is 11, so that the switch K63 is turned on, the switches K0-K62 are turned off, the tenth switch Kl10, the eleventh switch Kl20, the twelfth switch Kl30, the seventh switch Kh10 and the eighth switch Kh20 are all turned off, the ninth switch Kh30 is turned on, the reference voltage Vset=Vref output to the constant current source module 600, the output current Iled=Vref/Rcs, namely the maximum brightness of the LED, namely the closing state of each switch in the adjusting module is controlled, the brightness of the LED can be flexibly adjusted, and the dimming precision of the LED dimming circuit can be improved.
Still further, referring to fig. 5, in a third preferred embodiment of the present invention, the adjusting module 500 includes a thirteenth resistor Rh11, a fourteenth resistor Rh21, a fifteenth resistor Rl11, a sixteenth resistor Rl21, a fourth inverter U4, a fifth inverter U5, a thirteenth switch Kh11, a fourteenth switch Kh21, a fifteenth switch Kl11 and a sixteenth switch Kl21; one end of the thirteenth resistor Rh11 and the first connection end of the thirteenth switch Kh11 are both connected with the dc voltage-stabilizing power supply 100, the other end of the thirteenth resistor Rh11 and the second connection end of the thirteenth resistor Rh11 are connected with one end of the fourteenth resistor Rh21 and the first connection end of the fourteenth switch Kh21, the other end of the fourteenth resistor Rh21 and the second connection end of the fourteenth switch Kh21 are both connected with the voltage dividing module 300, the control end of the thirteenth switch Kh11 is connected with the output end of the fourth inverter U4, the control end of the fourteenth switch Kh21 is connected with the output end of the fifth inverter U5, and the input end of the fourth inverter U4 and the input end of the fifth inverter U5 are both connected with the multiplexing module 400; one end of the fifteenth resistor Rl11 and the first connection end of the fifteenth switch Kl11 are connected with the voltage dividing module 300, the other end of the fifteenth resistor Rl11 and the second connection end of the fifteenth switch Kl11 are both connected with one end of the sixteenth resistor Rl21 and the first connection end of the sixteenth switch Kl21, and the other end of the sixteenth resistor Rl21 and the second connection end of the sixteenth switch Kl21 are both grounded; the control end of the fifteenth switch Kl11 and the control end of the sixteenth switch Kl21 are both connected with the multi-path selection module 400; preferably, an inverter is connected between the thirteenth resistor Rh11 and the fifteenth switch Kl11 and between the fourteenth switch Kh21 and the sixteenth switch Kl21, respectively, and further, the control signals of the thirteenth resistor Rh11 and the fourteenth switch Kh21 are the inversions of the control signals of the fifteenth switch Kl11 and the sixteenth switch Kl21, however, in other embodiments, circuit devices with the same functions may be used, which is not limited in the present invention.
In the embodiment, on the basis of 64 switches of the original 63 resistors, only a fifteenth resistor Rl11 which is a fine-tuning resistor with the resistance value of 1/4R is needed to be added, a sixteenth resistor Rl21 which is a fine-tuning resistor with the resistance value of 2/4R, a thirteenth resistor Rh11 which is a compensation resistor with the resistance value of 1/4R, and a fourteenth resistor Rh21 which is a compensation resistor with the resistance value of 2/4R can realize 8-bit precision by only 67 resistors and 68 switches. Specifically, when the low-order 2bit of the dimming data is 00, the fifteenth switch Kl11 and the sixteenth switch Kl21 are both turned on, and the thirteenth switch Kh11 and the fourteenth switch Kh21 are both turned off; when the low-order 2bit of the dimming data is 01, the sixteenth switch Kl21 and the thirteenth switch Kh11 are turned on, and the fifteenth switch Kl11 and the fourteenth switch Kh21 are turned off; when the lower 2bit of the dimming data is 10, the fifteenth switch Kl11 and the fourteenth switch Kh21 are turned on, and the sixteenth switch Kl21 and the thirteenth switch Kh11 are turned off; when the lower 2bit of the dimming data is 11, the thirteenth switch Kh11 and the fourteenth switch Kh21 are turned on, and the fifteenth switch Kl11 and the sixteenth switch Kl21 are turned off.
If the dimming data with 8bit dimming precision is 0x00, the high-order 6bit binary number is 000000, the low-order 2bit binary number is 00, so that the switch K0 is turned on, the switches K1-K63 are turned off, the fifteenth switch Kl11 and the sixteenth switch Kl21 are all turned on, the thirteenth switch Kh11 and the fourteenth switch Kh21 are all turned off, the reference voltage vset=0v output to the constant current source module 600, the output current iled=vset/rcs=0a, namely the LED is turned off; if the dimming data with 8bit dimming precision is 0x7a (the binary number is 01111010, the decimal number is 122), the high-order 6bit binary number is 01110, the low-order 2bit binary number is 10, and therefore the switch K30 is turned on, the switches K0-K29 and K31-K63 are turned off, the fifteenth switch Kl11 and the fourteenth switch Kh21 are turned on, the fifteenth resistor Rl11 and the fourteenth resistor Rh21 are short-circuited, and the reference voltage is output to the constant current source module 600
Output current iled=122 Vref/255Rcs; if the dimming data with 8bit dimming precision is 0xff, the high-order 6bit binary number is 111111, the low-order 2bit binary number is 11, so that the switch K63 is turned on, the switches K0-K62 are turned off, the fifteenth switch Kl11 and the sixteenth switch Kl21 are turned off, the thirteenth switch Kh11 and the fourteenth switch Kh21 are turned on, the reference voltage Vset=Vref output to the constant current source module 600, the output current iled=Vref/Rcs, namely the maximum brightness of the LED, is also achieved by reducing the number of fine-tuning resistors and compensation resistors, correspondingly, the LED dimming circuit can achieve the dimming precision of 1/255 by increasing the resistance value of the resistor, and the structure of the LED dimming circuit is enriched due to the diversity of the setting of the adjusting module.
Still further, referring to fig. 6, in a fourth preferred embodiment of the present invention, the adjusting module 500 includes a seventeenth resistor Rl12, an eighteenth resistor Rl22, a nineteenth resistor Rl32, a seventeenth switch Kl12, an eighteenth switch Kl22 and a nineteenth switch Kl32; one end of the seventeenth resistor Rl12 and the first connection end of the seventeenth switch Kl12 are connected with the voltage dividing module 300, the other end of the seventeenth resistor Rl12 and the second connection end of the seventeenth switch Kl12 are connected with one end of the eighteenth resistor Rl22 and the first connection end of the eighteenth switch Kl22, the other end of the eighteenth resistor Rl22 and the second connection end of the eighteenth switch Kl22 are connected with one end of the nineteenth resistor Rl32 and the first connection end of the nineteenth switch Kl32, and the other end of the nineteenth resistor Rl32 and the second connection end of the nineteenth switch Kl32 are grounded; the control terminal of the seventeenth switch Kl12, the control terminal of the eighteenth switch Kl22 and the control terminal of the nineteenth switch Kl32 are all connected to the multiplexing module 400.
Compared with other embodiments, the embodiment has no compensation resistor, only three fine adjustment resistors with the resistance value of 1/4R are added, namely seventeenth resistor Rl12, eighteenth resistor Rl22 and nineteenth resistor Rl32, namely the adjustment module is only connected with the lower end of the resistor string, and the upper end of the resistor string is directly connected with the direct-current regulated power supply 100. Specifically, when the low-order 2bit of the dimming data is 00, the seventeenth switch Kl12, the eighteenth switch Kl22 and the nineteenth switch Kl32 are all turned on; when the low-order 2bit of the dimming data is 01, 2 of the seventeenth switch Kl12, the eighteenth switch Kl22 and the nineteenth switch Kl32 are turned on; when the low-order 2bit of the dimming data is 10, 1 of the seventeenth switch Kl12, the eighteenth switch Kl22 and the nineteenth switch Kl32 is turned on; when the low 2bit of the dimming data is 11, the seventeenth switch Kl12, the eighteenth switch Kl22, and the nineteenth switch Kl32 are all turned off.
If the dimming data with 8bit dimming precision is 0x00, the high-order 6bit binary number is 000000, the low-order 2bit binary number is 00, so that the switch K0 is turned on, the switches K1-K63 are turned off, the seventeenth switch Kl12, the eighteenth switch Kl22 and the nineteenth switch Kl32 are all turned on, the reference voltage Vset=0V output to the constant current source, the output current Iled=Vset/rcs=0A, namely the LED is turned off; if the dimming data with 8bit dimming precision is 0x7a (the binary number is 01111010, the decimal number is 122), the high-order 6bit binary number is 01110, and the low-order 2bit binary number is 10, so that the switch K30 is turned on, and the switches K0-K29 and the switch are turned on The switches K31-K63 are turned off, and 1 of the seventeenth switch Kl12, the eighteenth switch Kl22 and the nineteenth switch Kl32 is turned on, so that the seventeenth resistor Rl12 is short-circuited and outputs the reference voltage to the constant current source module 600
Output current iled=122 Vref/254Rcs; if the dimming data with 8bit dimming precision is 0x7b (the binary number is 01111011, the decimal number is 123), the high-order 6bit binary number is 01110, the low-order 2bit binary number is 11, and therefore the switch K30 is turned on, the switches K0-K29 and the switches K31-K63 are turned off, and the seventeenth switch Kl12, the eighteenth switch Kl22 and the nineteenth switch Kl32 are all turned off to output the reference voltage to the constant current source module 600
Output current iled=123 Vref/255Rcs; if the dimming data with 8bit dimming precision is 0xff, the high-order 6bit binary number is 111111 (the decimal number is 63), the low-order 2bit binary number is 11, so that the switch K63 is turned on, the switches K0-K62 are turned off, the seventeenth switch Kl12, the eighteenth switch Kl22 and the nineteenth switch Kl32 are all turned off, the reference voltage Vset=Vref output to the constant current source module 600, and the output current Iled=Vref/Rcs, namely the maximum brightness of the LED; in the embodiment, only 3 fine-tuning resistors are added, namely, only 66 resistors are needed, and 8-bit dimming precision can be realized by 67 switches, so that the circuit structure is simple in design, and the realization cost is reduced.
Further, the constant current source module 600 includes an operational amplifier A1, a first MOS transistor Q1, and a sampling resistor Rcs; the non-inverting input end of the operational amplifier A1 is a control end of the constant current source module 600 and is connected with the multi-path selection module 400, the inverting input end of the operational amplifier A1 is connected with the source electrode of the first MOS tube Q1 and one end of the sampling resistor Rcs, and the output end of the operational amplifier A1 is connected with the grid electrode of the first MOS tube Q1; the drain electrode of the first MOS tube Q1 is connected with the negative electrode of the LED lamp string; the other end of the sampling resistor Rcs is grounded, and after each switch is controlled to be closed by the switch encoder 410, a voltage signal is correspondingly output to the non-inverting input end of the operational amplifier A1, so as to be used as the reference voltage Vset of the constant current source module 600 to realize the adjustment of the driving current of the LED.
Correspondingly, the invention also provides an LED dimming method for improving the dimming precision, as shown in fig. 7, the LED dimming method for improving the dimming precision comprises the following steps:
s100, dividing the reference voltage output by the direct-current stabilized power supply by a voltage dividing module, and outputting corresponding voltage signals to a multi-path selection module through different taps;
s200, outputting a control signal to an adjusting module by a multi-path selecting module according to the received dimming data, and outputting a voltage signal output by a tap corresponding to a voltage dividing module to a constant current source module;
S300, adjusting the voltage signals output by the corresponding taps by an adjusting module according to the control signals;
s400, controlling the current flowing through the LED lamp string by the constant current source module according to the currently received voltage signal.
The invention also correspondingly provides an LED dimming device, which comprises a shell, wherein a PCB is arranged in the shell, and the PCB is provided with the LED dimming circuit for improving the dimming precision, and the LED dimming circuit for improving the dimming precision is described in detail above and is not described in detail here.
In summary, the LED dimming circuit, the dimming device and the dimming method for improving dimming precision provided by the invention include a voltage division module, a multi-path selection module, an adjustment module and a constant current source module, wherein the voltage division module divides a reference voltage output by a dc stabilized power supply and outputs corresponding voltage signals to the multi-path selection module through different taps; the multipath selection module outputs a control signal to the adjustment module according to the received dimming data, and outputs a voltage signal output by a tap corresponding to the voltage division module to the constant current source module; and the constant current source module controls the current flowing through the LED lamp string according to the currently received voltage signal. The invention can effectively improve the light modulation precision of the LED through the design of a simple circuit structure, simplifies the circuit structure and reduces the realization cost.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (7)
1. The LED dimming circuit is characterized by comprising a voltage division module, a multi-path selection module, an adjusting module and a constant current source module, wherein the voltage division module divides the reference voltage output by a direct current stabilized power supply and outputs corresponding voltage signals to the multi-path selection module through different taps; the multipath selection module outputs a control signal to the adjustment module according to the received dimming data, and outputs a voltage signal output by a tap corresponding to the voltage division module to the constant current source module; the adjusting module adjusts the voltage signal output by the corresponding tap according to the control signal, and the constant current source module controls the current flowing through the LED lamp string according to the currently received voltage signal;
the voltage division module comprises a resistor string, the resistor string is formed by connecting a plurality of voltage division resistors in series, the upper end of the resistor string is connected with a direct-current stabilized voltage supply or is connected with the direct-current stabilized voltage supply through the adjusting module, and the lower end of the resistor string is grounded through the adjusting module; the lower end tap of each voltage dividing resistor is respectively led out and connected with the multi-path selection module;
The adjusting module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch; one end of the first resistor and a first connecting end of the first switch are connected with a direct-current voltage-stabilizing power supply, the other end of the first resistor and a second connecting end of the first switch are connected with one end of the second resistor and a first connecting end of the second switch, the other end of the second resistor and a second connecting end of the second switch are connected with one end of the third resistor and a first connecting end of the third switch, the other end of the third resistor and a second connecting end of the third switch are connected with the voltage-dividing module, and a control end of the first switch, a control end of the second switch and a control end of the third switch are connected with a multi-path selection module; one end of the fourth resistor and a first connecting end of the fourth switch are connected with the voltage dividing module, the other end of the fourth resistor and a second connecting end of the fourth switch are both connected with one end of the fifth resistor and the first connecting end of the fifth switch, the other end of the fifth resistor and the second connecting end of the fifth switch are both connected with one end of the sixth resistor and the first connecting end of the sixth switch, and the other end of the sixth resistor and the second connecting end of the sixth switch are both grounded; the control end of the fourth switch, the control end of the fifth switch and the control end of the sixth switch are all connected with the multi-path selection module;
The dimming data is a binary code, the low-order 2bit of the dimming data is coded and then controls the fourth switch, the fifth switch and the sixth switch to be closed, and control signals of the first switch, the second switch and the third switch are reverse directions of the fourth switch, the fifth switch and the sixth switch; and after the high-order 6bit of the dimming data is coded, the switch of each switch in the multi-path selection module is controlled, and the high-order 6bit of the dimming data is specifically coded by a single thermal code.
2. The LED dimming circuit of claim 1, wherein the adjusting module is specifically configured to adjust the voltage dividing ratio of the voltage dividing module according to the control signal, so as to adjust the magnitude of the voltage signal output by the corresponding tap.
3. The LED dimming circuit of claim 1, wherein the adjustment module comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch; one end of the seventh resistor, the first connecting end of the seventh switch, the first connecting end of the eighth switch and the first connecting end of the ninth switch are all connected with a direct-current stabilized voltage supply, the other end of the seventh resistor and the second connecting end of the seventh switch are all connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the ninth resistor and the second connecting end of the eighth switch, the other end of the ninth resistor is connected with the second connecting end of the ninth switch and the voltage dividing module, and the control end of the seventh switch, the control end of the eighth switch and the control end of the ninth switch are all connected with the multiplexing module; one end of a tenth resistor and a first connecting end of a tenth switch are connected with the voltage dividing module, the other end of the tenth resistor is connected with one end of an eleventh resistor and the first connecting end of the eleventh switch, the other end of the eleventh resistor is connected with one end of the twelfth resistor and the first connecting end of the twelfth switch, and the other end of the twelfth resistor, a second connecting end of the tenth switch, a second connecting end of the eleventh switch and a connecting end of the twelfth switch are all grounded; the control end of the tenth switch, the control end of the eleventh switch and the control end of the twelfth switch are all connected with the multi-path selection module.
4. The LED dimming circuit of claim 1, wherein the adjustment module comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a thirteenth switch, a fourteenth switch, a fifteenth switch, and a sixteenth switch; one end of the thirteenth resistor and a first connecting end of the thirteenth switch are connected with a direct-current stabilized power supply, the other end of the thirteenth resistor and a second connecting end of the thirteenth switch are connected with one end of the fourteenth resistor and a first connecting end of the fourteenth switch, the other end of the fourteenth resistor and a second connecting end of the fourteenth switch are connected with the voltage division module, and a control end of the thirteenth switch and a control end of the fourteenth switch are connected with a multiplexing selection module; one end of the fifteenth resistor and a first connecting end of the fifteenth switch are connected with the voltage dividing module, the other end of the fifteenth resistor and a second connecting end of the fifteenth switch are both connected with one end of the sixteenth resistor and the first connecting end of the sixteenth switch, and the other end of the sixteenth resistor and the second connecting end of the sixteenth switch are both grounded; the control end of the fifteenth switch and the control end of the sixteenth switch are both connected with the multipath selection module.
5. The LED dimming circuit of claim 1, wherein the adjustment module comprises a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a seventeenth switch, an eighteenth switch, and a nineteenth switch; one end of the seventeenth resistor and a first connecting end of the seventeenth switch are connected with the voltage dividing module, the other end of the seventeenth resistor and a second connecting end of the seventeenth switch are connected with one end of the eighteenth resistor and a first connecting end of the eighteenth switch, the other end of the eighteenth resistor and the second connecting end of the eighteenth switch are connected with one end of the nineteenth resistor and the first connecting end of the nineteenth switch, and the other end of the nineteenth resistor and the second connecting end of the nineteenth switch are grounded; the control end of the seventeenth switch, the control end of the eighteenth switch and the control end of the nineteenth switch are all connected with the multi-path selection module.
6. The LED dimming circuit of claim 1, wherein the multiplexing module comprises a plurality of switches corresponding to the voltage dividing resistors, one end of each switch is correspondingly connected with a lower end tap of one voltage dividing resistor, the other end of each switch is connected with the constant current source module, and the control end of each switch is connected with the input end of the dimming data.
7. An LED dimming device comprising a housing, wherein a PCB is disposed in the housing, and the LED dimming circuit for improving dimming accuracy according to any one of claims 1 to 6 is disposed on the PCB.
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| PCT/CN2020/076692 WO2020220808A1 (en) | 2019-04-28 | 2020-02-26 | Led dimming circuit, dimming apparatus and dimming method for improving dimming precision |
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| CN111343764B (en) * | 2020-03-05 | 2024-12-24 | 深圳市晟碟半导体有限公司 | LED dimming circuit, device and dimming method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2690930A1 (en) * | 2012-07-26 | 2014-01-29 | O2 Micro, Inc. | Circuits and methods for driving light sources |
| CN106804072A (en) * | 2017-01-18 | 2017-06-06 | 深圳创维－Rgb电子有限公司 | A kind of LED constant current drive system and its constant-current control circuit |
| CN107071982A (en) * | 2017-05-19 | 2017-08-18 | 深圳市晟碟半导体有限公司 | LED drive device and its invariable power light adjusting circuit, light-dimming method |
| CN108495419A (en) * | 2018-04-28 | 2018-09-04 | 深圳市晟碟半导体有限公司 | A kind of LED light adjusting circuits, light modulating device and light-dimming method reducing harmonic distortion |
| CN209994590U (en) * | 2019-04-28 | 2020-01-24 | 深圳市晟碟半导体有限公司 | LED dimming circuit and dimming device capable of improving dimming precision |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6384762B2 (en) * | 2000-01-26 | 2002-05-07 | Microchip Technology Incorporated | Digitally switched impedance having improved linearity and settling time |
| US7345611B2 (en) * | 2003-09-10 | 2008-03-18 | Catalyst Semiconductor, Inc. | Digital potentiometer including plural bulk impedance devices |
| CN110035584B (en) * | 2019-04-28 | 2024-03-19 | 深圳市晟碟半导体有限公司 | LED dimming circuit, dimming device and dimming method for improving dimming precision |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2690930A1 (en) * | 2012-07-26 | 2014-01-29 | O2 Micro, Inc. | Circuits and methods for driving light sources |
| CN106804072A (en) * | 2017-01-18 | 2017-06-06 | 深圳创维－Rgb电子有限公司 | A kind of LED constant current drive system and its constant-current control circuit |
| CN107071982A (en) * | 2017-05-19 | 2017-08-18 | 深圳市晟碟半导体有限公司 | LED drive device and its invariable power light adjusting circuit, light-dimming method |
| CN108495419A (en) * | 2018-04-28 | 2018-09-04 | 深圳市晟碟半导体有限公司 | A kind of LED light adjusting circuits, light modulating device and light-dimming method reducing harmonic distortion |
| CN209994590U (en) * | 2019-04-28 | 2020-01-24 | 深圳市晟碟半导体有限公司 | LED dimming circuit and dimming device capable of improving dimming precision |
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