CN211406351U - Time-sharing multiplexing LED dimming device and circuit - Google Patents
Time-sharing multiplexing LED dimming device and circuit Download PDFInfo
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- CN211406351U CN211406351U CN202020236124.0U CN202020236124U CN211406351U CN 211406351 U CN211406351 U CN 211406351U CN 202020236124 U CN202020236124 U CN 202020236124U CN 211406351 U CN211406351 U CN 211406351U
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Abstract
The utility model discloses a time-sharing multiplexing LED dimming device and circuit, wherein the dimming circuit comprises a control module, a voltage generation module, a multi-path maintaining module and a light-emitting module, and the light-emitting module comprises a plurality of LED lamp strings and a constant current source unit; the control module converts multi-path dimming data into a voltage selection signal according to a preset period and outputs the voltage selection signal to the voltage generation module, so that the voltage generation module selects dimming voltage and outputs the dimming voltage to the multi-path maintaining module; the control module also outputs a plurality of paths of control signals corresponding to the dimming voltage to the plurality of paths of maintaining modules according to a preset period; the multi-path maintaining module selects a conductive path according to the control signal to output the dimming voltage to the corresponding constant current source unit and control the brightness of each LED lamp string, so that the brightness adjustment of the multi-path LED lamp strings is realized through a simple circuit structure, and the problems of current mutation, conduction radiation and flash are also avoided.
Description
Technical Field
The utility model relates to a LED technical field, in particular to multiplexing LED of timesharing device, circuit of adjusting luminance.
Background
In the application of LED dimming, high-power dimming generally uses a single chip to drive a single-path LED lamp string to realize dimming, and multi-path dimming needs a plurality of driving chips to be matched for use; in low-power dimming applications, such as RGBW four-way dimming of a bulb lamp or a filament lamp, the method of driving a single-way LED light string by using a single chip is large in size and high in cost due to the small size of the RGBW four-way dimming application, and is not suitable for such applications. In the application of dimming by driving multiple paths of LED lamp strings by a single chip, a PWM dimming signal is generally used for controlling the on or off time of an MOS (metal oxide semiconductor) tube below the LED lamp strings to realize dimming, and the mode can generate the problems of excessive conducted radiation and stroboscopic along with sudden current change.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art, an object of the present invention is to provide a time-division multiplexing LED light modulation device and circuit, which can effectively solve the problem of excessive conducted radiation and flash in the existing LED light modulation method.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a time-sharing multiplexing LED dimming circuit comprises a control module, a voltage generation module, a multi-path maintaining module and a light emitting module, wherein the light emitting module comprises a plurality of LED lamp strings connected in parallel and constant current source units the number of which corresponds to that of the LED lamp strings; the control module is used for converting multi-path dimming data into a voltage selection signal according to a preset period and outputting the voltage selection signal to the voltage generation module; the voltage generating module is used for selecting dimming voltage according to the voltage selection signal and outputting the dimming voltage to the multi-path maintaining module; the control module is also used for outputting a plurality of paths of control signals corresponding to the dimming voltage to the plurality of paths of maintaining modules according to a preset period; the multi-path maintaining module is used for selecting a conductive path according to the control signal to output the dimming voltage to the corresponding constant current source unit, and controlling the brightness of each LED lamp string.
In the time-division multiplexing LED dimming circuit, the voltage generation module comprises a voltage division unit and a multi-path selection unit; the voltage division unit is used for dividing the reference voltage and outputting the dimming voltage with the corresponding amplitude to the multi-path selection unit through different taps; the multi-path selection unit is used for outputting the dimming voltage output by the tap corresponding to the voltage division unit to the multi-path maintenance module according to the voltage selection signal.
In the time-sharing multiplexing LED dimming circuit, the control module comprises a timer, a multi-path storage unit and a decoding unit; the timer is used for timing according to the preset period and outputting a plurality of paths of control signals to the plurality of paths of storage units and the plurality of paths of maintaining modules according to the preset period; the multi-channel storage unit is used for storing multi-channel dimming data and selectively outputting the dimming data to the decoding unit according to the control signal; the decoding unit is used for decoding and converting the dimming data into the voltage selection signal and outputting the voltage selection signal to the voltage generation module.
In the time-sharing multiplexing LED dimming circuit, the multi-path maintaining module comprises a plurality of selection switches corresponding to the LED lamp strings and a plurality of capacitors corresponding to the selection switches; the control end of each selector switch is connected with the control module, one end of each selector switch is connected with the voltage generation module, and the other end of each selector switch is connected with the light emitting module and grounded through the corresponding capacitor.
In the time-sharing multiplexing LED dimming circuit, the voltage division unit comprises a resistor string, and 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 the reference voltage input end, the lower end of the resistor string is grounded, and a lower end tap of each divider resistor is led out and connected with the multi-path selection unit.
In the time-sharing multiplexing LED dimming circuit, the multi-path selection unit comprises a plurality of control switches corresponding to the voltage-dividing resistors, one end of each control switch is correspondingly connected with a lower end tap of one voltage-dividing resistor, the other end of each control switch is connected with the multi-path maintaining module, and the control end of each control switch is connected with the control module.
In the time-division multiplexing LED dimming circuit, the constant current source unit comprises an operational amplifier, an MOS (metal oxide semiconductor) tube and a sampling resistor; the non-inverting input end of the operational amplifier is connected with the multi-path maintaining module, the inverting input end of the operational amplifier is connected with the source electrode of the MOS tube and one end of the sampling resistor, and the output end of the operational amplifier is connected with the grid electrode of the MOS tube; the drain electrode of the MOS tube is correspondingly connected with the cathode of the LED lamp string; the other end of the sampling resistor is grounded.
The time-sharing multiplexing LED dimming device comprises a shell, wherein a PCB is arranged in the shell, and the PCB is provided with the time-sharing multiplexing LED dimming circuit.
Compared with the prior art, the utility model provides a multiplexing LED dimming device of timesharing, circuit, LED dimming circuit includes control module, voltage generation module, multichannel maintenance module and light emitting module, light emitting module includes a plurality of LED lamp cluster and with the constant current source unit that LED lamp cluster figure corresponds; the control module converts multi-path dimming data into a voltage selection signal according to a preset period and outputs the voltage selection signal to the voltage generation module; the voltage generation module selects dimming voltage according to the voltage selection signal and outputs the dimming voltage to the multi-path maintenance module; the control module also outputs a plurality of paths of control signals corresponding to the dimming voltage to the plurality of paths of maintaining modules according to a preset period; the multi-path maintaining module selects a conductive path according to the control signal to output the dimming voltage to the corresponding constant current source unit and control the brightness of each LED lamp string, so that the brightness adjustment of the multi-path LED lamp strings is realized through a simple circuit structure, and the problems of current mutation, conduction radiation and flash are also avoided.
Drawings
Fig. 1 is a block diagram of a time-division multiplexing LED dimming circuit provided by the present invention;
FIG. 2 is a schematic circuit diagram of a light emitting module and a multi-path maintaining module in the time-sharing multiplexing LED dimming circuit
Fig. 3 is a schematic circuit diagram of a voltage generation module in the time-division multiplexing LED dimming circuit;
fig. 4 is a schematic circuit diagram of a control module in the time-division multiplexing LED dimming circuit provided by the present invention;
fig. 5 is a timing diagram of the timer, the dimming data, the control signal and the selection switch in the time-division multiplexing LED dimming circuit provided by the present invention.
Detailed Description
The utility model provides a pair of multiplexing LED of timesharing device, circuit of adjusting luminance can effectively solve the conduction radiation that exists and exceed standard and the frequency flash problem among the current LED mode of adjusting luminance.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1 and 2, the present invention provides a time-division multiplexing LED dimming circuit, which includes a rectifier bridge 100, a control module 200, a voltage generation module 300, a multi-path maintenance module 400 and a light emitting module 500, wherein the control module 200 is connected to a dimming data input terminal, the voltage generation module 300 and the multi-path maintenance module 400, the voltage generation module 300 is further connected to the multi-path maintenance module 400, and the multi-path maintenance module 400 is further connected to the light emitting module 500.
The light emitting module 500 includes a plurality of LED strings 510 connected in parallel and constant current source units 520 corresponding to the number of the LED strings 510, wherein the anode of each LED string 510 is connected to the rectifier bridge 100, the cathode of each LED string 510 is connected to the constant current source unit 520, and the constant current source unit 520 is connected to the multi-path maintaining module 400; the rectifier bridge 100 is configured to rectify an input ac power and output a line voltage to each of the LED light strings 510, so as to provide a working power for each of the LED light strings 510; the control module 200 is configured to convert the multi-path dimming data into a voltage selection signal according to a preset period and output the voltage selection signal to the voltage generation module 300; the voltage generating module 300 is configured to select a dimming voltage according to the voltage selection signal and output the dimming voltage to the multi-path maintaining module 400; the control module 200 is further configured to output a plurality of control signals ch 1-chN corresponding to the dimming voltage to the plurality of maintaining modules 400 according to a preset period, where N is a positive integer greater than 1; the multi-path maintaining module 400 selects a conductive path according to the control signal to output the dimming voltage to the corresponding constant current source unit 520, so that the constant current source unit 520 correspondingly controls the brightness of each LED string 510 according to the dimming voltage; the utility model can realize the brightness adjustment of the multi-path LED lamp string 510 by controlling the voltage generation module 300 to multiplex in time according to the preset period by the control module 200, thereby reducing the area of the chip and the cost; and the multi-path maintaining module 400 provides the dimming voltage for each path of the LED light string 510 according to the control signal of the control module 200 to implement dimming, and compared with a method of directly turning on or off the MOS transistor below the LED light string 510 to implement dimming in a PWM manner, the current does not change suddenly, there is no problem of conduction radiation, and no additional stroboscopic is generated.
In specific implementation, referring to fig. 3, the voltage generating module 300 includes a voltage dividing unit 310 and a multi-path selecting unit 320, the voltage dividing unit 310 is connected to the reference voltage input terminal and the multi-path selecting unit 320, and the multi-path selecting unit 320 is connected to the multi-path maintaining module 400; the voltage dividing unit 310 is configured to divide a reference voltage and output the dimming voltage with the corresponding amplitude to the multi-path selecting unit 320 through different taps; the multi-path selection unit 320 outputs the dimming voltage output by the tap corresponding to the voltage division unit 310 to the multi-path maintenance module 400 according to the voltage selection signal, and after the reference voltage is divided by the voltage division unit 310, the multi-path selection selects the divided voltage of the tap corresponding to the voltage selection signal as the dimming voltage to be output to the multi-path maintenance module 400 according to the voltage selection signal, so as to complete the subsequent brightness adjustment of each LED light string 510.
Further, referring to fig. 4, the control module 200 includes a timer 210, a multi-path storage unit 220 and a decoding unit 230, the timer 210 is connected to the multi-path storage unit 220 and the multi-path maintaining module 400, and the multi-path storage unit 220 is further connected to the decoding unit 230 and a dimming data input terminal; the timer 210 is configured to time according to the preset period, and output a plurality of paths of the control signals to the plurality of paths of the storage units 220 and the plurality of paths of the maintaining module 400 according to the preset period; the multi-path storage unit 220 is configured to store a plurality of paths of the dimming data, and selectively output the dimming data to the decoding unit 230 according to the control signal; the decoding unit 230 is configured to decode and convert the dimming data into the voltage selection signal, and output the voltage selection signal to the voltage generation module 300, so that the voltage generation module 300 generates the dimming voltage.
In specific implementation, please refer to fig. 2, it should be noted that, in this embodiment, the number of the LED strings 510 is 3 for example, and correspondingly, the dimming data stored in the multi-path storage unit 220 is 3 paths, and the control signal output by the timer 210 is also 3 paths, which can be selected according to actual needs in other embodiments, which is not limited by the present invention. The multi-path storage unit 220 stores the received three paths of dimming data CH1, CH2, and CH3, respectively, where the dimming data CH1, CH2, and CH3 are stored 7-bit dimming data obtained according to externally input dimming data, where the dimming data may be received wireless dimming data, PWM dimming data, or IIC input dimming data, and the present embodiment is not limited thereto. Correspondingly, the timer 210 counts time according to a preset period, and outputs the control signals CH1, CH2 and CH3 to the multiplexing unit 320 in a periodic sequence, respectively, and the multiplexing unit 320 selects the dimming data CH1, CH2 and CH3 to be output to the decoding unit 230 according to the control signals CH1, CH2 and CH3, respectively; specifically, the timings selected by the control signals CH1, CH2, and CH3 and the dimming data CH1, CH2, and CH3 are as shown in fig. 5; the decoding unit 230 decodes the selected dimming data with 7 bits, and enables a corresponding one of the 128 voltage selection signals S1-S128 to be output to the voltage generation module 300, so that the voltage generation module selects the dimming voltage corresponding to the dimming data according to the received voltage selection signals S1-S128 and outputs the dimming voltage to the multi-path maintaining module 400.
Further, the multi-path maintaining module 400 includes a plurality of selection switches corresponding to the LED light string 510 and a plurality of capacitors corresponding to the selection switches, such as the selection switches Key 1-KeyN and the capacitors C1-CN in fig. 1, where N is a positive integer greater than 1; the control end of each selector switch is connected to the control module 200, one end of each selector switch is connected to the voltage generation module 300, and the other end of each selector switch is connected to the light emitting module 500 and grounded through the corresponding capacitor; correspondingly, the number of the selection switches in this embodiment is 3, and the number of the capacitors is also 3, although in other embodiments, the selection can be performed according to actual requirements.
The timer 210 periodically outputs the control signals ch1, ch2, and ch3 to the multi-path memory unit 220 and also outputs the control signals ch1, ch2, and ch3 to the multi-path maintaining module 400, respectively, and after receiving the control signals ch1 to ch3, the multi-path maintaining module 400 correspondingly controls the selection switches key1 to key3 to be turned on or off according to a periodic sequence; when the selection switch is turned on, the corresponding capacitor is charged or discharged to a dimming voltage and is output to the light emitting module 500, so as to control the brightness of the corresponding LED string 510 of the light emitting module 500; when the selection switch is turned off, the corresponding capacitor discharges to the light emitting module 500 to maintain the brightness of the corresponding LED light string 510 of the light emitting module 500 unchanged, thereby effectively preventing the LED light string 510 from stroboscopic.
Specifically, when the timer 210 selects the dimming data CH1 to output to the decoding unit 230, the selection switch key1 corresponding to the dimming data CH1 in the multi-path maintaining module 400 is turned on, the voltage generating module 300 outputs the dimming voltage selected by the dimming data CH1 to the multi-path maintaining module 400, and charges or discharges the capacitor C1 through the turned-on selection switch key1, that is, charges the capacitor C1 when the dimming voltage is higher than the voltage of the capacitor C1, and discharges when the dimming voltage is lower than the voltage of the capacitor C1, and simultaneously outputs the voltage of the capacitor C1 to the light emitting module 500, so as to control the operating current flowing through the LED light string 510, thereby realizing the brightness control of the LED light string 510; similarly, when the counter selects the dimming data CH2 to output to the decoding unit 230, the corresponding selection switch key2 in the multi-path maintaining module 400 is turned on, and the dimming voltage selected by the dimming data CH2 charges or discharges the capacitor C2 through the turned-on selection switch key2, so as to control the brightness of the LED light string 510; when the counter selects the CH3 dimming data, the above process can be obtained in the same way, and details are not described herein, so that the voltage generation module 300 is time-division multiplexed, and an input voltage is provided to the light emitting module 500 through the three-way selection switch and the capacitor for adjusting the working current of each LED string 510.
Further, with reference to fig. 3, the voltage dividing unit 310 includes a resistor string, and 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 the reference voltage input end, the lower end of the resistor string is grounded, and a lower end tap of each divider resistor is respectively led out to be connected with the multi-path selection unit 320; the resistor string in this embodiment includes voltage dividing resistors R1, R2, R3, … …, R126, R127, and R128, and of course, in other embodiments, the voltage dividing resistors may be selected as needed, which is not limited by the present invention. The multi-path selection unit 320 controls on or off of each path of tap according to the 128 voltage selection signals to select the voltage output to the multi-path maintenance module 400, i.e., the dimming voltage, so as to provide the dimming voltage for the light emitting module 500, thereby implementing dimming control on each LED string 510.
Furthermore, the multi-path selection unit 320 includes a plurality of control switches corresponding to the voltage dividing resistors, one end of each control switch is correspondingly connected to a lower end tap of one voltage dividing resistor, the other end of each control switch is connected to the multi-path maintenance module 400, and a control end of each control switch is connected to the control module 200; in this embodiment, the number of the control switches is 128, the control switches respectively receive the 128 voltage selection signals output from the control module 200, and the selection control signals S1 to S128 respectively control the control switches K1 to K128 to turn on or off, so as to select the dimming voltage, that is, one of the 128 levels of voltages is selected and output according to the voltage selection signals S1 to S128, so as to output to the multi-way maintaining module 400.
Further, with reference to fig. 2, a plurality of constant current source units 520 corresponding to the LED light string 510 in the light emitting module 500 control the working current flowing through the LED light string 510 according to the dimming voltage; the constant current source unit 520 comprises an operational amplifier, an MOS transistor and a sampling resistor; the non-inverting input end of the operational amplifier is connected with the multi-path maintaining module 400, the inverting input end of the operational amplifier is connected with the source electrode of the MOS tube and one end of the sampling resistor, and the output end of the operational amplifier is connected with the grid electrode of the MOS tube; the drain electrode of the MOS tube is correspondingly connected with the cathode of the LED lamp string 510; the other end of the sampling resistor is grounded.
In specific implementation, the light emitting module 500 in this embodiment includes three constant current source units 520, and in this corresponding embodiment, the light emitting module 500 includes three paths of the constant current source modules and three paths of the LED strings 510, each path of the constant current source units 520 is correspondingly connected to one of the selection switches, that is, the other end of the selection switch key1 is correspondingly connected to the non-inverting input terminal of the operational amplifier OP1, the other end of the selection switch key2 is correspondingly connected to the non-inverting input terminal of the operational amplifier OP2, and the other end of the selection switch key3 is correspondingly connected to the non-inverting input terminal of the operational amplifier OP 3; therefore, the dimming voltage outputted by the voltage generating module 300 is inputted to the operational amplifier through each of the selection switches, and the negative electrode of each of the LED strings 510 is correspondingly connected to one of the constant current source units 520, so that the present invention can control the input voltage Vref of the constant current source unit 520 under the LED strings 510 (in this embodiment, the input voltage of each of the constant current source units 520 is Vref1, Vref2 and Vref3), i.e. the brightness of the LED strings 510 can be controlled; the constant current source unit 520 utilizes the characteristics of an operational amplifier, the working current flowing through the sampling resistor is Vref/Rcs, Rcs is the resistance value of the sampling resistor, the LED light string 510 is connected in series with the sampling resistor Rcs (in this embodiment, the sampling resistors Rcs1, Rcs2 and Rcs3 are included), the current flowing through the LED light string 510 is equal to the current flowing through the sampling resistor, and therefore the input voltage of the operational amplifier is changed, the current flowing through the LED light string 510 can be changed, and the brightness of the LED light string 510 is further changed.
The utility model discloses an adjustment LED lamp cluster 510 electric current is adjusted to the input voltage of the constant current source of LED lamp cluster 510 below, and then realizes LED lamp cluster 510's luminance change, compares in the method that uses the direct MOS pipe of opening or closing LED lamp cluster 510 below of PWM mode to realize the brightness modulation, and the electric current can not mutate, does not have the conduction radiation problem, also can not additionally produce the stroboscopic.
The utility model discloses a multiplexing LED dimmer circuit of timesharing's working process specifically does: the control module converts dimming data into a voltage selection signal according to a preset period and outputs the voltage selection signal to the voltage generation module; the voltage generation module selects dimming voltage according to the voltage selection signal and outputs the dimming voltage to the multi-path maintenance module; the control module outputs a control signal corresponding to the dimming voltage to the multi-path maintaining module according to a preset period; and the multi-path maintaining module selects a conductive path according to the control signal to output the dimming voltage to the corresponding constant current source unit so as to control the brightness of each LED lamp string.
Based on the multiplexing LED dimmer circuit of foretell timesharing, the utility model discloses still the correspondence provides a multiplexing LED dimmer circuit of timesharing, which comprises an outer shell, be provided with the PCB board in the shell, be provided with on the PCB board as above the multiplexing LED dimmer circuit of timesharing, because the above has carried out detailed description to this multiplexing LED dimmer circuit of timesharing, no longer repeated here.
To sum up, the utility model provides a time-sharing multiplexing LED dimming device, circuit, time-sharing multiplexing LED dimming circuit includes control module, voltage generation module, multichannel maintenance module and light emitting module, light emitting module includes a plurality of LED lamp cluster that connect in parallel and with the constant current source unit that LED lamp cluster figure corresponds; the control module is used for converting dimming data into a voltage selection signal according to a preset period and outputting the voltage selection signal to the voltage generation module; the voltage generating module is used for selecting dimming voltage according to the voltage selection signal and outputting the dimming voltage to the multi-path maintaining module; the control module is also used for outputting a control signal corresponding to the dimming voltage to the multi-path maintaining module according to a preset period; the multi-path maintaining module is used for selecting a conductive path according to the control signal to output the dimming voltage to the corresponding constant current source unit and controlling the brightness of each LED lamp string, so that the brightness adjustment of the multi-path LED lamp strings is realized, the problems of current mutation, conduction radiation and frequency flash are avoided, the circuit structure is simplified, and the cost is reduced.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (8)
1. The time-sharing multiplexing LED dimming circuit is characterized by comprising a control module, a voltage generation module, a multi-path maintaining module and a light emitting module, wherein the light emitting module comprises a plurality of LED lamp strings connected in parallel and constant current source units the number of which corresponds to that of the LED lamp strings; the control module is used for converting multi-path dimming data into a voltage selection signal according to a preset period and outputting the voltage selection signal to the voltage generation module; the voltage generating module is used for selecting dimming voltage according to the voltage selection signal and outputting the dimming voltage to the multi-path maintaining module; the control module is also used for outputting a plurality of paths of control signals corresponding to the dimming voltage to the plurality of paths of maintaining modules according to a preset period; the multi-path maintaining module is used for selecting a conductive path according to the control signal to output the dimming voltage to the corresponding constant current source unit, and controlling the brightness of each LED lamp string.
2. The time-multiplexed LED dimming circuit of claim 1, wherein the voltage generation module comprises a voltage division unit and a multiplexing unit; the voltage division unit is used for dividing the reference voltage and outputting the dimming voltage with the corresponding amplitude to the multi-path selection unit through different taps; the multi-path selection unit is used for outputting the dimming voltage output by the tap corresponding to the voltage division unit to the multi-path maintenance module according to the voltage selection signal.
3. The time-multiplexed LED dimming circuit of claim 1, wherein the control module comprises a timer, a multi-way storage unit, and a decoding unit; the timer is used for timing according to the preset period and outputting a plurality of paths of control signals to the plurality of paths of storage units and the plurality of paths of maintaining modules according to the preset period; the multi-channel storage unit is used for storing multi-channel dimming data and selectively outputting the dimming data to the decoding unit according to the control signal; the decoding unit is used for decoding and converting the dimming data into the voltage selection signal and outputting the voltage selection signal to the voltage generation module.
4. The time-sharing multiplexing LED dimming circuit of claim 1, wherein the multi-path maintaining module comprises a plurality of selection switches corresponding to the LED light strings and a plurality of capacitors corresponding to the selection switches; the control end of each selector switch is connected with the control module, one end of each selector switch is connected with the voltage generation module, and the other end of each selector switch is connected with the light emitting module and grounded through the corresponding capacitor.
5. The time-division multiplexing LED dimming circuit according to claim 2, wherein the voltage division unit comprises a resistor string, and 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 reference voltage input end, the lower end of the resistor string is grounded, and a lower end tap of each divider resistor is led out and connected with the multi-path selection unit.
6. The time-sharing multiplexing LED dimming circuit according to claim 5, wherein the multiplexing unit comprises a plurality of control switches corresponding to the voltage-dividing resistors, one end of each control switch is correspondingly connected to a lower end tap of one voltage-dividing resistor, the other end of each control switch is connected to the multiplexing maintaining module, and a control end of each control switch is connected to the control module.
7. The time-division multiplexing LED dimming circuit according to claim 1, wherein the constant current source unit comprises an operational amplifier, a MOS tube and a sampling resistor; the non-inverting input end of the operational amplifier is connected with the multi-path maintaining module, the inverting input end of the operational amplifier is connected with the source electrode of the MOS tube and one end of the sampling resistor, and the output end of the operational amplifier is connected with the grid electrode of the MOS tube; the drain electrode of the MOS tube is correspondingly connected with the cathode of the LED lamp string; the other end of the sampling resistor is grounded.
8. A time-division multiplexing LED dimming device, comprising a housing, wherein a PCB is disposed in the housing, and wherein the PCB is disposed with the time-division multiplexing LED dimming circuit according to any one of claims 1 to 7.
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| CN202020236124.0U CN211406351U (en) | 2020-02-28 | 2020-02-28 | Time-sharing multiplexing LED dimming device and circuit |
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| CN202020236124.0U CN211406351U (en) | 2020-02-28 | 2020-02-28 | Time-sharing multiplexing LED dimming device and circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111163549A (en) * | 2020-02-28 | 2020-05-15 | 深圳市晟碟半导体有限公司 | Time-sharing multiplexing LED dimming device, circuit and dimming method thereof |
| CN114567951A (en) * | 2022-03-10 | 2022-05-31 | 四维生态科技（杭州）有限公司 | Method and device for adjusting lighting system and computer storage medium |
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2020
- 2020-02-28 CN CN202020236124.0U patent/CN211406351U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111163549A (en) * | 2020-02-28 | 2020-05-15 | 深圳市晟碟半导体有限公司 | Time-sharing multiplexing LED dimming device, circuit and dimming method thereof |
| CN111163549B (en) * | 2020-02-28 | 2023-09-22 | 深圳市晟碟半导体有限公司 | Time-division multiplexing LED dimming device, circuit and dimming method thereof |
| CN114567951A (en) * | 2022-03-10 | 2022-05-31 | 四维生态科技（杭州）有限公司 | Method and device for adjusting lighting system and computer storage medium |
| CN114567951B (en) * | 2022-03-10 | 2023-12-22 | 四维生态科技（杭州）有限公司 | Method and device for adjusting lighting system and computer storage medium |
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