CN210629922U - LED dimming circuit and dimming device - Google Patents
LED dimming circuit and dimming device Download PDFInfo
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- CN210629922U CN210629922U CN201920758165.3U CN201920758165U CN210629922U CN 210629922 U CN210629922 U CN 210629922U CN 201920758165 U CN201920758165 U CN 201920758165U CN 210629922 U CN210629922 U CN 210629922U
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Abstract
The utility model discloses a light-emitting diode (LED) dimming circuit and a dimming device, wherein the LED dimming circuit comprises a reference voltage source, a line voltage compensation module, a dimming module and a constant current source module; the line voltage compensation module outputs compensation information to a reference voltage source according to the current line voltage, the reference voltage source modulates reference voltage according to the compensation information and then outputs reference voltage with the compensation information to the dimming module, the dimming module outputs corresponding dimming voltage to the constant current source module according to the reference voltage with the compensation information and externally input dimming signals, and the constant current source module controls the working current of the LED lamp string according to the dimming voltage. The utility model discloses an input has compensation information's reference voltage to the module of adjusting luminance adjusts luminance for the synchronous adjustment line voltage compensation degree of depth that corresponds under the different degree of depth of adjusting luminance, the homoenergetic satisfies the requirement of constant power under every degree of depth of adjusting luminance, does not influence the linearity of adjusting luminance again, improves the job stabilization nature of product.
Description
Technical Field
The utility model relates to a LED technical field, in particular to LED dimmer circuit and dimming device.
Background
The linear constant current drives the LED lamp, and the fluctuation of the voltage of the city network can cause the lamp beads to flicker, so that the linear dimming driving chip needs to realize constant power to improve the whole lighting effect. However, in the conventional dimming circuit, since the line voltage compensation coefficient cannot be adjusted, constant power cannot be realized at each dimming depth, for example, when the dimming depth is 100%, constant power is realized by adjusting the line voltage compensation coefficient, when the dimming depth is 10%, since the line voltage compensation coefficient is not changed, the line compensation is too deep at this time, which may cause the output voltage to be 0, which seriously affects the dimming depth, and in addition, a single line voltage compensation coefficient may cause that constant power cannot be realized at a part of the dimming depth, and may also affect the linearity of dimming.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art's weak point, the utility model aims to provide a LED dimming circuit and device of adjusting luminance has compensation information's reference voltage to the module of adjusting luminance through the input and adjusts luminance for the synchronous adjustment line voltage compensation degree of depth that corresponds under the different degree of depth of adjusting luminance, the requirement of homoenergetic meeting the constant power under every degree of depth of adjusting luminance does not influence the linearity of adjusting luminance again, effectively improves the job stabilization nature of product.
In order to achieve the purpose, the utility model adopts the following technical proposal:
an LED dimming circuit comprises a reference voltage source, a line voltage compensation module, a dimming module and a constant current source module; the line voltage compensation module outputs compensation information to a reference voltage source according to the current line voltage, the reference voltage source modulates reference voltage according to the compensation information and then outputs reference voltage with the compensation information to the dimming module, the dimming module outputs corresponding dimming voltage to the constant current source module according to the reference voltage with the compensation information and externally input dimming signals, and the constant current source module controls working current of the LED lamp string according to the dimming voltage.
In the LED dimming circuit, the dimming module comprises a voltage division unit, a multi-path selection unit and a dimming decoding unit; the voltage division unit divides the reference voltage and outputs voltage signals with corresponding amplitudes to the multi-path selection unit through different taps, the dimming decoding unit outputs brightness data to the multi-path selection unit according to externally input dimming signals, and the multi-path selection unit outputs the voltage signals output by the corresponding taps to the constant current source module as current dimming voltages according to the brightness data.
In the LED dimming circuit, the voltage division unit comprises a first operational amplifier and a resistor string, wherein the non-inverting input end of the first operational amplifier is connected with the reference voltage source, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is also connected with one end of the resistor string, and the other end of the resistor string is grounded; the resistor string comprises a plurality of divider resistors connected in series, and a lower end tap of each divider resistor is connected with the multi-path selection unit respectively.
In the LED dimming circuit, the multi-path selection unit comprises a plurality of switches, the number of the switches corresponds 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 dimming decoding unit.
In the LED dimming circuit, the multi-path selection unit further comprises an encoder, the input end of the encoder is connected with the dimming decoding unit, and the output ends of the encoder are correspondingly connected with the control end of each switch.
In the LED dimming circuit, the line voltage compensation module comprises a first sampling resistor, a first MOS (metal oxide semiconductor) tube and a second MOS tube, one end of the first sampling resistor is connected with a line voltage input end, the other end of the first sampling resistor is connected with a drain electrode of the first MOS tube, a grid electrode of the first MOS tube and the drain electrode of the first MOS tube are both connected with a grid electrode of the second MOS tube, a source electrode of the first MOS tube and a source electrode of the second MOS tube are both grounded, and the drain electrode of the second MOS tube is connected with the reference voltage source.
The constant current source module comprises a second operational amplifier, a third MOS tube and a second sampling resistor; the non-inverting input end of the second operational amplifier is the control end of the constant current source module and is connected with the dimming module, the inverting input end of the second operational amplifier is connected with the source electrode of a third MOS tube and one end of a second sampling resistor, and the output end of the second operational amplifier is connected with the grid electrode of the third MOS tube; the drain electrode of the third MOS tube is connected with the cathode of the LED lamp string; the other end of the second sampling resistor is grounded.
In the LED dimming circuit, the dimming signal is any one of a digital dimming signal, an analog dimming signal and a PWM dimming signal.
The LED dimming device comprises a shell, wherein a PCB is arranged in the shell, and the PCB is provided with the LED dimming circuit.
Compared with the prior art, in the LED dimming circuit and the dimming device provided by the utility model, the LED dimming circuit comprises a reference voltage source, a line voltage compensation module, a dimming module and a constant current source module; the line voltage compensation module outputs compensation information to a reference voltage source according to the current line voltage, the reference voltage source modulates reference voltage according to the compensation information and then outputs reference voltage with the compensation information to the dimming module, the dimming module outputs corresponding dimming voltage to the constant current source module according to the reference voltage with the compensation information and externally input dimming signals, and the constant current source module controls working current of the LED lamp string according to the dimming voltage. The utility model discloses an input has compensation information's reference voltage to the module of adjusting luminance adjusts luminance for the synchronous adjustment line voltage compensation degree of depth that corresponds under the different degree of depth of adjusting luminance, the homoenergetic satisfies the requirement of constant power under every degree of depth of adjusting luminance, does not influence the linearity of adjusting luminance again, effectively improves the job stabilization nature of product.
Drawings
Fig. 1 is a block diagram of a LED dimming circuit according to the present invention.
Fig. 2 is a circuit diagram of a first preferred embodiment of the LED dimming circuit provided by the present invention.
Fig. 3 is a circuit diagram of a second preferred embodiment of the LED dimming circuit provided by the present invention.
Fig. 4 is a circuit diagram of a first application embodiment of the LED dimming circuit provided by the present invention.
Fig. 5 is a circuit diagram of a second application embodiment of the LED dimming circuit provided by the present invention.
Detailed Description
An object of the utility model is to provide a LED dimmer circuit and device of adjusting luminance has compensation information's reference voltage to the module of adjusting luminance through the input and adjusts luminance for the synchronous adjustment line voltage compensation degree of depth that corresponds under the different degree of depth of adjusting luminance, the requirement of homoenergetic satisfaction constant power under every degree of depth of adjusting luminance does not influence the linearity of adjusting luminance again, effectively improves the job stabilization nature of product.
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, the present invention provides an LED dimming circuit connected to an LED string, including a rectifier bridge, a reference voltage source 10, a line voltage compensation module 20, a dimming module 30 and a constant current source module 40, wherein an ac power is input to an input end of the rectifier bridge, an output end of the rectifier bridge is connected to the line voltage compensation module 20, the line voltage compensation module 20 is connected to the dimming module 30 through the reference voltage source 10, the dimming module 30 is further connected to the constant current source module 40, and the constant current source module 40 is connected to the LED string.
The utility model discloses a rectifier bridge carries out output line voltage after the rectification to the input alternating current, later through line voltage compensation module 20 samples line voltage, and according to present line voltage size output compensation information to reference voltage source 10, after obtaining the compensation information, reference voltage source 10 then adjusts its output reference voltage according to this compensation information, outputs reference voltage Vref _ lvc that has compensation information, inputs reference voltage Vref _ lvc to dimming module 30 as new reference signal and regards as the reference dimming voltage, dimming module 30 outputs corresponding dimming voltage Vip to constant current source module 40 according to the dimming signal and reference voltage Vref _ lvc that has compensation information when receiving the dimming signal of external input, by constant current source module 40 according to the operating current of dimming voltage control LED lamp cluster, that is, the utility model provides an among the LED dimmer circuit, the input signal of module 30 of adjusting luminance is for having the reference voltage of compensation information and reference voltage information simultaneously, consequently when adjusting luminance the operation, the regulation that goes on reference voltage has contained and has adjusted reference voltage and to the synchronous control of line voltage compensation coefficient, no longer adopt single line voltage compensation coefficient when the different degree of depth of adjusting luminance promptly for can all can satisfy the constant power requirement under every degree of depth of adjusting luminance, and do not influence the linearity of adjusting luminance, also improve product job stabilization nature when not influencing the product degree of depth of adjusting luminance.
Specifically, as shown in fig. 2 and fig. 3, the line voltage compensation module 20 includes a first sampling resistor Rcs1, a first MOS transistor Q1, and a second MOS transistor Q2, one end of the first sampling resistor Rcs1 is connected to a line voltage input end, the other end of the first sampling resistor Rcs1 is connected to a drain of the first MOS transistor Q1, a gate of the first MOS transistor Q1 and a drain of the first MOS transistor Q1 are both connected to a gate of the second MOS transistor Q2, a source of the first MOS transistor Q1 and a source of the second MOS transistor Q35are both grounded, and a drain of the second MOS transistor Q2 is connected to the reference voltage source 10. In specific implementation, the line voltage compensation module 20 can sample from the output end VAC of the rectifier bridge or sample from the lower side of the LED light string, that is, as shown in fig. 2, in the first preferred embodiment of the present invention, the line voltage input end is the output end VAC of the rectifier bridge, the first sampling resistor Rcs1 samples the line voltage from VAC, and in the second preferred embodiment of the present invention, as shown in fig. 3, the line voltage input end is the negative pole of the LED light string, the first sampling resistor Rcs1 samples the line voltage from the negative pole of the LED light string, the voltage obtained by sampling at this time is the voltage signal obtained after the line voltage is reduced by the LED light string, and the voltage signal also has the characteristic of the current line voltage, so that the line voltage compensation module 20 can also be used as the basis for outputting the subsequent compensation information, and the line voltage compensation module 20 samples the line voltage and outputs the compensation information to the reference voltage source Vref 10, so that the signal output from the reference voltage source 10 to the dimming module When dimming is performed, for example, when the dimming depth is 100%, the dimming voltage Vip output by the dimming module 30 is Vref _ lvc × 100%; when the dimming depth is 50%, the dimming voltage Vip is Vref _ lvc × 50%, and the reference voltage Vref _ lvc includes compensation information, so that Vref _ lvc × 50% means that the degree of line voltage compensation is halved on the basis of halving the reference voltage Vref output by the reference voltage source 10 itself, and similarly, when the dimming depth is 10%, the degree of line voltage compensation is synchronously adjusted to 10%, so that the requirement of constant power is satisfied at each dimming depth, and the dimming linearity is not affected.
Further, the dimming module 30 includes a voltage dividing unit 31, a multiplexing unit 32 and a dimming decoding unit 33, an input end of the voltage dividing unit 31 is connected to the reference voltage source 10, the voltage dividing unit 31 is connected to the multiplexing unit 32 through different taps, and the multiplexing unit 32 is further connected to the dimming decoding unit 33 and the constant current source module 40; the voltage dividing unit 31 divides the reference voltage and outputs voltage signals with corresponding amplitudes to the multiple selecting unit 32 through different taps, the dimming decoding unit 33 outputs brightness data to the multiple selecting unit 32 according to externally input dimming signals, and the multiple selecting unit 32 outputs the voltage signals output by the corresponding taps as current dimming voltages to the constant current source module 40 according to the brightness data.
That is the voltage signal of different amplitude of every tap output of voltage divider unit 31, through the decoding unit 33 of adjusting luminance receives the signal of adjusting luminance and exports corresponding luminance data to multiple choice unit 32, according to luminance data selection wherein the voltage signal of taking a percentage all the way exports to constant current source module 40 as current dimming voltage all the way, the utility model discloses can directly pass through according to the signal of adjusting luminance received multiple choice unit 32 changes voltage divider unit 31's output voltage size to export corresponding dimming voltage to constant current source module 40, by constant current source module 40 basis the operating current of dimming voltage regulation LED lamp cluster realizes the constant power and adjusts luminance, and the accommodation process is simple high-efficient and can not introduce higher harmonic, has further improved product property and can produce the property ability.
Further, the voltage dividing unit 31 includes a first operational amplifier a1 and a resistor string, a non-inverting input terminal of the first operational amplifier a1 is connected to the reference voltage source 10, an inverting input terminal of the first operational amplifier a1 is connected to an output terminal of the first operational amplifier a1, the output terminal of the first operational amplifier a1 is further connected to one end of the resistor string, and the other end of the resistor string is grounded; the resistor string comprises a plurality of voltage dividing resistors connected in series, and a lower end tap of each voltage dividing resistor is connected with the multi-path selection unit 32. In this embodiment, the resistor string is formed by connecting a plurality of voltage dividing resistors in series, as shown in the figures, Rh, R1, R2, Rn-1, and Rn, the number of the specific voltage dividing resistors can be selected according to the actual dimming requirement, the present invention does not limit this, the upper end of the resistor string is connected to the output end of the first operational amplifier a1, and the lower end of the resistor string is grounded; the lower extreme of every divider resistance take a percentage draw respectively with the multiple choice unit 32 is connected, promptly the utility model discloses a reference voltage that has compensation information that first operational amplifier A1 exported reference voltage source 10 carries out the voltage and follows, later carry out the partial pressure to reference voltage through a plurality of divider resistance, the lower extreme of every divider resistance is taken a percentage and will be exported the voltage signal of different amplitude, multiple choice unit 32 is taken a percentage according to the luminance data control that the decoding unit 33 of adjusting luminance exported that switches on and close the dimming voltage that directly changes the selection output to constant current source module 40, and then realizes the dimming control of synchronous control line voltage compensation degree.
Specifically, the dimming signal may be selected in various ways, and is preferably a digital dimming signal, for example, a digital dimming signal transmitted in a wired or wireless manner through SPI, I2C, UART, WiFi, bluetooth, etc., but a PWM dimming signal or an analog dimming signal including an analog voltage and an analog current, etc. may also be used, and the dimming decoding unit 33 and the multiplexer may also have various implementations according to different dimming signals.
In specific implementation, as shown in fig. 4, in the first application embodiment of the present invention, the dimming signal is a digital dimming signal, the dimming decoding unit 33 can be implemented by a bluetooth module, a WiFi module, or a serial interface such as SPI, and is specifically configured to directly receive luminance data through wired or wireless communication and output the luminance data to the multiple selecting unit 32, in this embodiment, the bluetooth signal is used as an example for explanation, the luminance data sent by the external bluetooth controller is directly received through the bluetooth module, and the data is transmitted to the multiple selecting unit 32, it should be explained that, in this embodiment, only 5 levels of luminance adjustment are implemented by 5 voltage dividing resistors for explanation, of course, the number of voltage dividing resistors can be adjusted as required in other embodiments.
Further, in the present embodiment, the multiple-path selection unit 32 includes a plurality of switches, the number of the switches corresponds to the number of the voltage dividing resistors, as shown in K1 to K5 in fig. 4, 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 40, and the control end of each switch is connected to the optical decoding unit. The switch can be realized by a relay, a triode, a MOSFET, a transmission gate and the like.
Further, the constant current source module 40 includes a second operational amplifier a2, a third MOS transistor Q3, and a second sampling resistor Rcs 2; the non-inverting input end of the second operational amplifier a2 is the control end of the constant current source module 40, and is connected to the dimming module 30, the inverting input end of the second operational amplifier a2 is connected to the source of the third MOS transistor Q3 and one end of the second sampling resistor Rcs2, and the output end of the second operational amplifier a2 is connected to the gate of the third MOS transistor Q3; the drain electrode of the third MOS tube Q3 is connected with the negative electrode of the LED lamp string; the other end of the second sampling resistor Rcs2 is grounded.
In specific implementation, the reference voltage is divided by the resistor string of the voltage dividing unit 31 to obtain five voltage signals V1-V5, the bluetooth module directly receives luminance data sent by an external bluetooth controller, the luminance data is preferably a thermal unique code of 5 bits, each bit controls one switch, for example, 00001 represents K5 to turn on and off other switches, and the dimming voltage Vip is V5; 00010 represents that K4 turns on other switches, and the dimming voltage Vip is V4; 00100 represents that K3 switches on other switches and turns off, and dimming voltage Vip is equal to V3 at this moment, and so on, thereby can control the closing and turning off of each switch through digital signals and then realize the output of different dimming voltages, and the implementation mode is efficient and can effectively reduce the power grid interference.
Further, please refer to fig. 5, in a second application embodiment of the present invention, the multiple-path selecting unit 32 further includes an encoder 321, an input end of the encoder 321 is connected to the dimming decoding unit 33, a plurality of output ends of the encoder 321 are correspondingly connected to the control end of each switch, when different from the first application embodiment, the encoder 321 is added to the multiple-path selecting unit 32 in this embodiment, so as to implement a dimming mode of the PWM dimming signal or the analog dimming signal, for example, when an analog voltage or an analog current is adopted, the dimming decoding unit 33 can be implemented by an analog-to-digital converter, which is specifically configured to perform analog-to-digital conversion on the received analog dimming signal and output a digital signal to the encoder 321, encode the digital signal into encoded data adapted to the current dimming level through the encoder 321, assuming that the analog-to-digital converter in this embodiment is 3-bit analog-to-, the analog dimming signal is converted into binary digits of 000, 001., 111 and then transmitted to an encoder 321, the encoder 321 encodes the received 3-bit digital signal and converts the digital signal into a hot unique code of 5 bits, each bit controls a switch, and specifically, the single-hot encoding is adopted, for example, 000 is encoded into 00001; 001 and 010 are both coded to 00010; 011 and 100 are both encoded as 00100; 101 and 110 are both encoded as 01000; 111 is coded into 10000, and then the working state of each switch is controlled to realize dimming control.
When the PWM dimming signal is adopted, the dimming decoding unit 33 may be implemented by a duty ratio judger, which is specifically configured to perform duty ratio judgment on the received PWM signal and output the obtained duty ratio data to the encoder 321, and in the specific implementation, the duty ratio judger is composed of a sampling clock and a counter, and assuming that the PWM signal is sampled N times in one period, the counter counts the number of times that the PWM signal is sampled for a high level in one period, that is, the duty ratio of the current PWM signal may be obtained as luminance data, and the luminance data is transmitted to the encoder 321 to be encoded, so that encoded data for controlling the on or off of each switch may be obtained, thereby implementing dimming control.
Correspondingly, the utility model discloses well LED dimmer circuit's theory of operation specifically does: the line voltage compensation module outputs compensation information to a reference voltage source according to the current line voltage; the reference voltage source modulates the reference voltage according to the compensation information and then outputs the reference voltage with the compensation information to the dimming module; the dimming module outputs corresponding dimming voltage to the constant current source module according to the reference voltage with the compensation information and an externally input dimming signal; and the constant current source module controls the working current of the LED lamp string according to the dimming voltage.
The utility model discloses still correspondingly provide a LED dimming device, which comprises an outer shell, be provided with the PCB board in the shell, be provided with on the PCB board as above the LED dimmer circuit that reduces harmonic distortion, because the above has been right the LED dimmer circuit that reduces harmonic distortion has carried out detailed introduction, and here is no longer detailed.
To sum up, in the LED dimming circuit and the dimming device provided by the present invention, the LED dimming circuit includes a reference voltage source, a line voltage compensation module, a dimming module, and a constant current source module; the line voltage compensation module outputs compensation information to a reference voltage source according to the current line voltage, the reference voltage source modulates reference voltage according to the compensation information and then outputs reference voltage with the compensation information to the dimming module, the dimming module outputs corresponding dimming voltage to the constant current source module according to the reference voltage with the compensation information and externally input dimming signals, and the constant current source module controls working current of the LED lamp string according to the dimming voltage. The utility model discloses an input has compensation information's reference voltage to the module of adjusting luminance adjusts luminance for the synchronous adjustment line voltage compensation degree of depth that corresponds under the different degree of depth of adjusting luminance, the homoenergetic satisfies the requirement of constant power under every degree of depth of adjusting luminance, does not influence the linearity of adjusting luminance again, effectively improves the job stabilization nature of product.
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 (9)
1. An LED dimming circuit is characterized by comprising a reference voltage source, a line voltage compensation module, a dimming module and a constant current source module; the line voltage compensation module outputs compensation information to a reference voltage source according to the current line voltage, the reference voltage source modulates reference voltage according to the compensation information and then outputs reference voltage with the compensation information to the dimming module, the dimming module outputs corresponding dimming voltage to the constant current source module according to the reference voltage with the compensation information and externally input dimming signals, and the constant current source module controls working current of the LED lamp string according to the dimming voltage.
2. The LED dimming circuit of claim 1, wherein the dimming module comprises a voltage division unit, a multiplexing unit and a dimming decoding unit; the voltage division unit divides the reference voltage and outputs voltage signals with corresponding amplitudes to the multi-path selection unit through different taps, the dimming decoding unit outputs brightness data to the multi-path selection unit according to externally input dimming signals, and the multi-path selection unit outputs the voltage signals output by the corresponding taps to the constant current source module as current dimming voltages according to the brightness data.
3. The LED dimming circuit according to claim 2, wherein the voltage dividing unit comprises a first operational amplifier and a resistor string, a non-inverting input terminal of the first operational amplifier is connected to the reference voltage source, an inverting input terminal of the first operational amplifier is connected to an output terminal of the first operational amplifier, the output terminal of the first operational amplifier is further connected to one end of the resistor string, and the other end of the resistor string is grounded; the resistor string comprises a plurality of divider resistors connected in series, and a lower end tap of each divider resistor is connected with the multi-path selection unit respectively.
4. The LED dimming circuit according to claim 3, wherein the multiplexing unit comprises a plurality of switches, the number of the switches corresponds to that of the voltage dividing resistors, 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, and a control end of each switch is connected to the dimming decoding unit.
5. The LED dimming circuit of claim 4, wherein the multiplexing unit further comprises an encoder, an input terminal of the encoder is connected to the dimming decoding unit, and a plurality of output terminals of the encoder are correspondingly connected to the control terminal of each switch.
6. The LED dimming circuit according to claim 1, wherein the line voltage compensation module comprises a first sampling resistor, a first MOS transistor and a second MOS transistor, one end of the first sampling resistor is connected to the line voltage input end, the other end of the first sampling resistor is connected to the drain of the first MOS transistor, the gate of the first MOS transistor and the drain of the first MOS transistor are both connected to the gate of the second MOS transistor, the source of the first MOS transistor and the source of the second MOS transistor are both grounded, and the drain of the second MOS transistor is connected to the reference voltage source.
7. The LED dimming circuit according to claim 1, wherein the constant current source module comprises a second operational amplifier, a third MOS transistor and a second sampling resistor; the non-inverting input end of the second operational amplifier is the control end of the constant current source module and is connected with the dimming module, the inverting input end of the second operational amplifier is connected with the source electrode of a third MOS tube and one end of a second sampling resistor, and the output end of the second operational amplifier is connected with the grid electrode of the third MOS tube; the drain electrode of the third MOS tube is connected with the cathode of the LED lamp string; the other end of the second sampling resistor is grounded.
8. The LED dimming circuit according to any one of claims 1 to 7, wherein the dimming signal is any one of a digital dimming signal, an analog dimming signal and a PWM dimming signal.
9. An LED dimming device, comprising a housing, wherein a PCB is arranged in the housing, and the PCB is provided with the LED dimming circuit as claimed in any one of claims 1 to 8.
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| CN201920758165.3U CN210629922U (en) | 2019-05-24 | 2019-05-24 | LED dimming circuit and dimming device |
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| CN201920758165.3U CN210629922U (en) | 2019-05-24 | 2019-05-24 | LED dimming circuit and dimming device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110177410A (en) * | 2019-05-24 | 2019-08-27 | 深圳市晟碟半导体有限公司 | A kind of LED light adjusting circuit, dimming device and light-dimming method |
| CN112654111A (en) * | 2020-12-30 | 2021-04-13 | 上海新进芯微电子有限公司 | LED dimming circuit, LED driving system and electronic equipment |
| CN114495844A (en) * | 2022-01-26 | 2022-05-13 | 北京奕斯伟计算技术有限公司 | Dimming circuit, backlight control system and display device of LED |
-
2019
- 2019-05-24 CN CN201920758165.3U patent/CN210629922U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110177410A (en) * | 2019-05-24 | 2019-08-27 | 深圳市晟碟半导体有限公司 | A kind of LED light adjusting circuit, dimming device and light-dimming method |
| CN112654111A (en) * | 2020-12-30 | 2021-04-13 | 上海新进芯微电子有限公司 | LED dimming circuit, LED driving system and electronic equipment |
| CN114495844A (en) * | 2022-01-26 | 2022-05-13 | 北京奕斯伟计算技术有限公司 | Dimming circuit, backlight control system and display device of LED |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |