CN110461059B - Digital dimming control chip, digital dimming control circuit and digital dimming control method - Google Patents
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Abstract
A digital dimming control chip, a digital dimming control circuit and a digital dimming control method, wherein the digital dimming control chip comprises: the system comprises a signal access module, a processing module, a current control module and a current output module; the signal access module is used for receiving one path of digital control signal; the processing module is used for carrying out shift processing and latch processing on the digital control signal to output a gain control signal and a dimming control signal; the current control module is used for adjusting the reference current according to the gain control signal to obtain a reference output current, and adjusting the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp; the digital dimming control circuit can realize the flexible dimming control function of the LED lamp, the electric energy running state of the LED lamp has good adjustability and high control response speed, so that the luminous effect of the LED lamp can completely meet the actual visual demands of technicians.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a digital dimming control chip, a digital dimming control circuit and a digital dimming control method.
Background
With the rapid development of electronic circuit control technology, technicians usually adopt two modes of analog control and digital control to control the working state of electronic components; compared with an analog control mode, the digital control mode has higher control response speed, so that the digital control mode can greatly improve the working performance of electronic components, and the electronic components can realize corresponding circuit functions according to operation instructions of technicians; therefore, the signal processing speed and the signal processing precision of the electronic components are improved in a digital control mode, and the electronic components can be completely and automatically controlled.
However, in the practical application process, a digital control mode needs to adopt more complicated steps when being applied to the process of electronic components, and the flexibility of the digital control mode is low; taking an LED (LIGHT EMITTING Diode) lamp as an example, when the traditional technology is used for carrying out digital control on the LED lamp, a more complex electronic circuit is needed, and the traditional technology can only realize a simpler control function on the LED lamp in the process of carrying out digital control on electronic components, for example, the traditional digital control circuit can not accurately change the brightness of the LED lamp according to the actual circuit function requirement of a user, so that the digital adjustment mode flexibility of the LED lamp is lower, the different visual requirements of technicians can not be met, the dimming control flexibility and compatibility of the LED lamp are reduced, and the application range is limited.
In summary, in the process of digitally controlling the LED lamp in the conventional technology, the control function of the light emitting state of the LED lamp is single, and the compatibility is low.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a digital dimming control chip, a digital dimming control circuit and a digital dimming control method, which aim to solve the problems that in the process of digitally controlling an LED lamp by a traditional technical scheme, the luminous effect of the LED lamp cannot be changed according to the actual demands of technicians, so that the digital control mode of the LED lamp is low in flexibility and difficult to be universally applied.
A first aspect of an embodiment of the present invention provides a digital dimming control chip electrically connected to an LED lamp, the digital dimming control chip including:
The signal access module is used for receiving one path of digital control signals;
the processing module is connected with the signal access module and is used for carrying out shift processing on the digital control signal and latching an output gain control signal and a dimming control signal;
the current control module is connected with the processing module and the LED lamp and is used for adjusting the reference current according to the gain control signal to obtain a reference output current and adjusting the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp.
In one embodiment, the current control module includes:
the gain control unit is connected with the processing module and is used for adjusting the reference current according to the gain control signal so as to generate the reference output current; and
And the dimming control unit is connected with the processing module, the gain control unit and the LED lamp and is used for adjusting the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp.
In one embodiment, the gain control unit includes:
The first operational amplifier, the first switching tube, the second switching tube, the plurality of reference current sources and the plurality of gain control switching tubes;
Each of the reference current sources is used for outputting the reference current;
A first input end of the first operational amplifier is connected with a first reference voltage, and an output end of the first operational amplifier is connected with a control end of the first switching tube;
The first ends of the reference current sources are respectively connected with a first direct current power supply, the second ends of the reference current sources are respectively connected with the first conducting ends of the gain control switching tubes in a one-to-one correspondence manner, and the second ends of the gain control switching tubes, the first conducting ends of the first switching tubes and the control ends of the second switching tubes are commonly connected to form a current output end of the gain control unit; the control ends of the gain control switch tubes are connected with the processing module;
The second conducting end of the first switching tube and the second input end of the first operational amplifier are commonly connected to the first conducting end of the second switching tube, and the second conducting end of the second switching tube is grounded;
And the current output end of the gain control unit is connected with the dimming control unit.
In one embodiment, the dimming control unit includes:
The second operational amplifier, the fourth switching tube, the third switching tubes and the dimming control switching tubes;
The first conducting ends of the dimming control switch tubes are connected with the gain control unit, the control ends of the dimming control switch tubes are connected with the processing module, and the second ends of the dimming control switch tubes are respectively connected with the control ends of the third switch tubes in a one-to-one correspondence manner;
the first input end of the second operational amplifier and the first conducting ends of the plurality of third switching tubes are commonly connected with the first conducting end of the fourth switching tube;
The second conducting ends of the third switching tubes are grounded;
the first input end of the second operational amplifier is connected with a second reference voltage, the output end of the second operational amplifier is connected with the control end of the fourth switching tube, and the first conduction end of the fourth switching tube is connected with the LED lamp.
In one embodiment, the processing module includes: the signal processing unit is connected with the current control module;
the signal access unit is used for accessing the digital control signal;
The signal processing unit is used for carrying out shift processing and latch processing on the digital control signal to output the gain control signal and the dimming control signal;
the data forwarding unit is used for forwarding the digital control signals after the shift processing and the latch processing.
In one embodiment, the signal processing unit includes:
the bit counter is connected with the signal access unit and is used for accessing a digital control signal and counting pulses in the digital control signal to obtain a counting result;
The shift register is connected with the bit counter and the signal access unit, and is used for accessing the digital control signal and carrying out shift processing on the digital control signal according to the counting result; and
The data latch is connected with the bit counter, the shift register, the data forwarding unit and the current control module and is used for latching the digital control signal after the shift processing.
In one embodiment, the digital dimming control chip further comprises:
The code word detection module is connected with the processing module and the current control module and is used for analyzing the digital control signal to obtain byte data and generating a standby control signal when detecting that the byte data is 0;
the processing module is also used for entering a standby mode according to the standby control signal;
The current control module is also used for entering a standby mode according to the standby control signal.
A second aspect of an embodiment of the present invention provides a digital dimming control circuit connected to at least two LED lamps, the digital dimming control circuit comprising at least two cascaded digital dimming control chips as described above; the digital dimming control chips are respectively connected with the LED lamps in a one-to-one correspondence mode, and each digital dimming control chip is used for adjusting the corresponding light source parameters of the LED lamp.
In one embodiment, the digital dimming control circuit further comprises:
The digital control module is connected with a first digital dimming control chip in at least two digital dimming control chips and is used for generating the digital control signals;
wherein the digital control signal further comprises standby control data;
Each digital dimming control chip is further used for entering a standby mode according to the standby control data.
A third aspect of an embodiment of the present invention provides a digital dimming control method, including:
Receiving a digital control signal;
the digital control signal is subjected to shift processing and latching processing and then a gain control signal and a dimming control signal are output;
And regulating the reference current according to the gain control signal to obtain a reference output current, and regulating the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp.
The digital dimming control chip can carry out synchronous digital adjustment on the luminous state of the LED lamp, so that the LED lamp can realize various luminous effects according to the actual demands of technicians, the actual visual demands of the technicians are met, and the control flexibility is high; the digital dimming control chip has a simplified circuit module structure, is connected with one path of digital control signal through the signal receiving module, and outputs a gain control signal and a dimming control signal after processing the digital control signal so as to realize the multifunctional dimming of the LED lamp, greatly improve the digital control efficiency and the digital control precision of the LED lamp and have stronger operability; therefore, the digital dimming control chip can realize parallel conversion output of digital control signals, the output current of the LED lamp is changed in real time through the dimming control signals, the ratio of the output current of the LED lamp to the reference output current is equal to the preset current ratio, so that the light source parameters of the LED lamp are adaptively changed, the light-emitting state of the LED lamp can meet the actual visual demands of technicians, and the light-emitting state control effect of the LED lamp is good; the digital dimming control chip can adaptively and comprehensively adjust the luminous state of the LED lamp according to the actual demands of technicians, and can be compatibly applied to various different industrial technical fields; therefore, the defect that the traditional technology has lower flexibility in digital dimming control of the LED lamp and the luminous effect of the LED lamp cannot meet the actual visual demands of technicians is overcome.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a digital dimming control chip according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a current output module according to an embodiment of the invention;
fig. 3 is a schematic circuit diagram of a gain control unit according to an embodiment of the invention;
Fig. 4 is a schematic circuit diagram of a dimming control unit according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a processing module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a signal processing unit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another structure of a digital dimming control chip according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another structure of a digital dimming control chip according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a digital dimming control circuit according to an embodiment of the present invention;
Fig. 10 is a schematic diagram illustrating connection relationships between circuit modules in a digital dimming control circuit according to an embodiment of the present invention;
FIG. 11 is a schematic diagram illustrating another configuration of a digital dimming control circuit according to an embodiment of the present invention;
fig. 12 is a specific flowchart of a digital dimming control method according to an embodiment of the present invention.
Fig. 13 is a schematic structural diagram of a digital dimming control system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. 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.
It should be noted that, the "LED lamp" referred to herein includes various types of LED lamps in the art, and no limitation is made herein on the type of LED lamp; therefore, the digital dimming control chip 10 in the embodiment of the invention can perform multifunctional digital adjustment on the luminous effects of various types of LED lamps, and has higher flexibility and compatibility.
Referring to fig. 1, a schematic structural diagram of a digital dimming control chip 10 provided in an embodiment of the present invention, the digital dimming control chip 10 is electrically connected with one LED lamp 20, and the light emitting state of the LED lamp 20 can be flexibly adjusted by the digital dimming control chip 10, so that the light emitting state of the LED lamp 20 can be adaptively changed according to the actual needs of technicians, and the LED lamp 20 can be generally suitable for various different industrial technical fields, and the best dimming control effect is achieved; the digital dimming control chip 10 in the embodiment can realize a flexible and complete digital dimming control function for the LED lamp 20; for convenience of explanation, only the portions related to the present embodiment are shown, and the detailed description is as follows:
the digital dimming control chip 10 includes: signal access module 101, to processing module 102 and current control module 103.
The signal access module 101 accesses a digital control signal.
The digital dimming control chip 10 in this embodiment is compatible and applicable to various different circuit systems, and the working state of each circuit module in the digital dimming control chip 10 can be changed in real time by the digital control signal, so that the digital dimming control chip 10 has higher digital control efficiency; the digital control function of the LED lamp 20 can be realized by one path of digital control signal accessed by the signal access module 101, so that the control steps of the digital dimming control chip 10 are further simplified, and the transmission cost of the digital control signal in the digital dimming control chip 10 is reduced;
The processing module 102 is connected with the signal access module 101, and the processing module 102 is used for performing shift processing and latch processing on the digital control signal to output a gain control signal and a dimming control signal.
The processing module 102 has the functions of signal transmission and signal forwarding, the processing module 102 is connected with one path of digital control signal, and the processing module 102 performs shift processing and latch processing on the digital control signal so that the processing module 102 outputs one path of digital information; therefore, the processing module 102 in this embodiment can implement shift processing and latch processing of the digital control signal, simplify the control steps of the digital control signal, and improve the transmission efficiency and conversion rate of the digital control signal; therefore, after the processing module 102 performs shift processing and latch processing on the digital control signal, the control information in the digital control signal can be completely analyzed, and the multifunctional dimming control effect on the LED lamp is realized by combining the gain control signal and the dimming control signal, so that the efficiency of digital control is extremely high.
The current control module 103 is connected with the processing module 102 and the LED lamp 20, and the current control module 103 is configured to adjust the reference current according to the gain control signal to obtain a reference output current, and adjust a ratio between the output current of the LED lamp 20 and the reference output current according to the dimming control signal, so that the light source parameter of the LED lamp 20 is changed.
The current control module 103 can accurately acquire control information in the gain control signal and the dimming control signal, and the current control module 103 adjusts the reference current according to the gain control signal so as to obtain a reference output current with a specific amplitude; providing current reference information by reference output current in the digital dimming control process of the LED lamp so as to change the electric energy running state of the LED lamp; therefore, after the current control module 103 in this embodiment adjusts the reference current according to the gain control signal, the reference output current with different preset amplitudes is output, and the current control module 103 can implement a flexible signal conversion function for the light emitting state of the LED lamp; therefore, the embodiment realizes the multifunctional digital control function according to the reference output current, so that the light emitting state of the LED lamp can be adaptively adjusted, and the signal processing flexibility and stability of the digital dimming control chip 10 are ensured.
Optionally, the current control module 103 can adjust the output current of the LED lamp 20 according to the dimming control information in the dimming control signal, so that the ratio between the output current of the LED lamp 20 and the reference output current is equal to a preset current ratio, and illustratively, the ratio between the output current of the LED lamp 20 and the reference output current by the dimming control signal is 500:1, then if the reference output current is 0.01A, the actual output current of the LED lamp 20 is: 5A; the current control module 103 can change the electric energy input state of the LED lamp 20 according to the dimming control signal, so that the light source effect of the LED lamp 20 can completely meet the actual visual requirement of technicians; the current control module 103 may change the output current of the LED lamp 20 according to the dimming control signal.
In the schematic structure of the digital dimming control chip 10 shown in fig. 1, the digital dimming control chip 10 can realize a flexible adjustment function for the light emitting state of one LED lamp, and further the schematic structure of the digital dimming control chip 10 has a flexible and compatible circuit structure, can realize the self-adaptive adjustment for the light emitting state of the LED lamp, and has strong expandability; the digital dimming control chip 10 in the embodiment can realize a multifunctional digital adjusting function for the luminous effect of the LED lamp 20, and gain control signals and dimming control signals are sequentially obtained after the digital control signals are processed and converted, so that the luminous state of the LED lamp is flexibly adjusted through the dimming control signals, and the control is simple and convenient; therefore, the digital dimming control chip 10 realizes a flexible digital control function on the luminous state of the LED lamp, so that the luminous effect of the LED lamp can meet the actual circuit function requirement of technicians; the problem that the dimming control effect of the LED lamp cannot meet the actual visual demands of technicians due to the fact that the dimming function of the digital control mode on the LED lamp is single and the flexibility of the digital control mode is low in the traditional technology is effectively solved.
As an alternative implementation manner, fig. 2 shows a schematic structural diagram of the current control module 103 provided in this embodiment, referring to fig. 2, the current control module 103 further includes: a gain control unit 1031 and a dimming control unit 1032.
The gain control unit 1031 is connected to the processing module 102, and the gain control unit 1031 is configured to adjust the reference current according to the gain control signal to generate the reference output current.
Wherein the gain control unit 1031 in the present embodiment matches the digital dimming function of the LED lamp 20 by changing the current transmission state of the reference current such that the reference output current has a specific magnitude.
The dimming control unit 1032 is connected to the gain control unit 1031 and the LED lamp 20, and the dimming control unit is configured to adjust a ratio between an output current of the LED lamp 20 and a reference output current according to the dimming control signal, so as to change a light source parameter of the LED lamp 20.
When the processing module 102 outputs the dimming control signal to the dimming control unit 1032, the current output state of the dimming control unit 1032 can be changed by the dimming control signal, and the reference output current is made to be current reference information, so that the ratio of the output current of the LED lamp 20 to the reference output current exhibits a specific proportional relationship, and the digital dimming function for the LED and the like 20 is realized.
The present embodiment can precisely adjust the power operation of the LED lamp 20 in combination with the gain control unit 1031 and the dimming control unit 1032.
As an alternative implementation manner, fig. 3 shows a specific circuit structure of the gain control unit 1031 provided in this embodiment, referring to fig. 3, the gain control unit 1031 includes: the first operational amplifier Op1, the first switching tube M1', the second switching tube M2, a plurality of reference current sources (denoted by Ir1, … IrN in fig. 3, where N is a positive integer greater than 1), and a plurality of gain control switching tubes (denoted by D1, … DN in fig. 3).
Each reference current source is used for outputting reference current;
the first input end of the first operational amplifier is connected to the first reference voltage Vref1, and the output end of the first operational amplifier Op1 is connected to the control end of the first switching tube M1.
The first ends of the reference current sources are connected with a first direct current power supply VCC1, the second ends of the reference current sources are respectively connected with the first conducting ends of the gain control switching tubes in a one-to-one correspondence manner, and the second ends of the gain control switching tubes, the first conducting ends of the first switching tubes M1 and the control ends of the second switching tubes M2 are commonly connected to form a current output end of a gain control unit 1031; the control ends of the gain control switch tubes are connected with the processing module 102; the gain control signals output by the processing module 102 can further enable the plurality of gain control switching tubes to be turned on or turned off, and by changing the level state of the gain control signals, the corresponding gain control switching tubes can be enabled to be turned on or turned off for an exemplary purpose; only when the gain control switching tube is conducted, the reference current source correspondingly connected with the gain control switching tube can output the reference current with preset amplitude.
The second conducting end of the first switching tube M1 and the second input end of the first operational amplifier Op1 are commonly connected to the first conducting end of the second switching tube M2, and the second conducting end of the second switching tube M2 is grounded GND.
The current output of the gain control unit 1031 is connected to the dimming control unit 1032.
Optionally, the first switch tube M1 is a MOS tube or a triode, and the second switch tube M2 is a MOS tube or a triode; the first switch tube M1 is a PMOS tube, the drain electrode of the PMOS tube is a first conducting end of the first switch tube M1, the gate electrode of the PMOS tube is a control end of the first switch tube M1, and the source electrode of the PMOS tube is a second conducting end of the first switch tube M1, so that the gain control unit 1031 has a simplified and compatible circuit structure.
Optionally, the first input end of the first operational amplifier Op1 is a positive phase input end or a negative phase input end of the first operational amplifier Op 1; illustratively, the first input of the first operational amplifier Op1 is a positive phase input and the second input of the first operational amplifier Op1 is a negative phase input.
In the circuit structure of the gain control unit 1031 shown in fig. 3, the voltage clamping function can be realized by combining the first operational amplifier Op1, the first switching tube M1 and the second switching tube M2, so that the current output terminal of the gain control unit 1031 safely outputs the reference output current to the dimming control unit 1032.
Therefore, the embodiment controls the on or off of the plurality of gain control switching tubes respectively through the gain control signals, so that the reference output current is equal to the sum of the reference currents output by the plurality of reference current sources, and the reference output current has a specific amplitude; the embodiment can change the current output states of a plurality of reference current sources in real time; and then the currents which can be output by the direct mutual combination of the reference current sources have any amplitude, so that the digital control precision and the control stability of the LED lamp are ensured. As an alternative implementation manner, fig. 4 shows a specific circuit schematic of the dimming control unit 1032 provided in this embodiment, referring to fig. 4, the dimming control unit 1032 includes: the second operational amplifier Op2, the fourth switching tube M2, a plurality of third switching tubes (denoted by D21, D22, … D2P in fig. 4, where P is a positive integer greater than or equal to 2) and a plurality of dimming control switching tubes (denoted by M31, M32, … M3P in fig. 4).
The first conducting ends of the dimming control switch tubes are connected to the gain control unit 1031, the control ends of the dimming control switch tubes are connected to the processing module 102, and the second ends of the dimming control switch tubes are respectively connected with the control ends of the third switch tubes in a one-to-one correspondence manner; and the dimming control signal output by the processing module 102 can change the on or off state of the corresponding dimming control switch tube.
The first input terminal of the second operational amplifier Op2 and the first conducting terminals of the plurality of third switching tubes are commonly connected to the first conducting terminal of the fourth switching tube M4.
The second conducting ends of the third switching tubes M3 are all grounded to GND.
The first input end of the second operational amplifier OP2 is connected to the second reference voltage Vref, the output end of the second operational amplifier OP2 is connected to the control end of the fourth switching tube M4, and the first conducting end of the fourth switching tube M4 is connected to the LED lamp 20.
Optionally, the fourth switching tube M4 is a MOS tube or a triode, where the fourth switching tube M4 and the second operational amplifier OP2 are combined to play a role of voltage clamping, so as to ensure the stability and safety of the dimming control unit 1032 for the dimming control of the LED lamp 20.
In the structural schematic diagram of the dimming control unit 1032 shown in fig. 4, when the control terminal of the dimming control switching tube receives the dimming control signal, the corresponding dimming control switching tube can be controlled to be turned on or off by the level state of the dimming control signal, so that the corresponding third switching tube can be turned on or off; for example, when 3 third switching transistors in the dimming control unit 1032 are turned on, the total current output by the dimming control unit 1032 is equal to 3 times the reference output current, and the ratio between the output current of the LED lamp and the reference output current is 3:1, a step of; therefore, the ratio between the output current of the LED lamp 20 and the reference output current is flexibly adjusted by controlling the on/off states of the plurality of third switching tubes, and the output current of the LED lamp 20 has simpler operation steps.
As an alternative implementation manner, fig. 5 shows a schematic structural diagram of the processing module 102 provided in this embodiment, referring to fig. 5, the processing module 102 includes: the signal access unit 1021, the signal processing unit 1022 and the data forwarding unit 1023 are sequentially connected, the signal processing unit 102 is connected with the current control module 103, and further the gain control signal and the dimming control signal can be output to the current control module 103 through the signal processing unit 102 so as to change the working state of the current control module 103.
The signal access unit 1021 is used for accessing a digital control signal.
The signal processing unit 1022 is configured to perform shift processing and latch processing on the digital control signal to output a gain control signal and a dimming control signal.
The data transfer unit 1023 is used for transferring the digital control signal after the shift processing and the latch processing.
Optionally, the data forwarding unit 1023 is connected to the next chip, so that the next chip can be treated by converting the digital control signal through the data forwarding unit 1023, so that the processing module 102 in this embodiment has higher communication compatibility and signal transmission stability.
Therefore, in the present embodiment, in the process of digitally controlling the light emitting states of the LED lamps 20 by the digital dimming control chip 10, the cascade transmission of the digital control signals can be realized by combining the signal access unit 1021 and the data forwarding unit 1023, and the processing module 102 can generate corresponding gain control signals and dimming control signals according to the digital control signals, so as to realize flexible adjustment of the light emitting states of the LED lamps 20, and greatly ensure the digital control efficiency and accuracy of the digital dimming control chip 10 on the light emitting states of the LED lamps 20.
As an alternative implementation manner, fig. 6 shows a schematic structural diagram of a signal processing unit 1022 provided in this embodiment, referring to fig. 6, the signal processing unit 1022 includes: a bit counter 601, a shift register 602, and a data latch 603.
The bit counter 601 is connected to the signal access unit 1021, and the bit counter 601 is used for accessing a digital control signal and counting pulses in the digital control signal to obtain a counting result.
Optionally, the pulse in the digital control signal is a rising edge or a falling edge; the bit counter 601 can realize the function of real-time counting for the pulse in the digital control signal, the counting result obtained by the bit counter 601 truly reflects the waveform change in the digital control signal, and the digital control information can be completely known through the counting result, so that the real-time processing function for the digital control signal is facilitated; therefore, the bit counter 601 in this embodiment can more comprehensively analyze the control information in the digital control signal, and improves the processing precision and processing efficiency of the digital control signal.
The shift register 602 is connected to the bit counter 601 and the signal access unit 1021, and the shift register 602 is used for accessing a digital control signal and performing shift processing on the digital control signal according to a counting result.
The shift register 602 has a shift function for the digital control signal, and the shifted digital control information has different signal forms, so that the digital control signal has different level change rules; therefore, the bit counter 601 outputs the data shift reference to the shift register 602, and the shift register 602 in the present embodiment can implement data shift for the digital control signal, so that the digital control signal output by the shift register 602 contains specific digital control information, so as to implement the digital control function for the LED lamp 20; the digital control signal output by the shift register 602 has higher precision and accuracy, and the inside of the processing module 102 has higher signal transmission and conversion efficiency.
The data latch 603 is connected to the bit counter 601, the shift register 602, the data transfer unit 1023, and the current control module 103, and the data latch 603 is used for latching the digital control signal after the shift process.
The data latch 603 can retain control information in the digital control signal, so that each processing module 102 outputs the gain control signal and the dimming control signal to the current control module 103, and a phenomenon that the digital information is lost in the internal transmission process of the digital dimming control chip 10 is avoided, and the digital dimming control chip 10 in the embodiment can realize safer and more stable digital control functions according to the gain control signal and the dimming control signal, has wider application range, and is beneficial to improving the digital control response precision of the LED lamp 20; the gain control signal and the dimming control signal output by the data latch 603 can completely meet the digital control requirement of technicians; therefore, the processing modules 102 in this embodiment have higher precision cascade control performance, and the complexity of transmission and processing steps of the digital control signal is reduced.
As an alternative implementation manner, fig. 7 shows another schematic structure of the digital dimming control chip 10 provided in this embodiment, compared to the schematic structure of the digital dimming control chip 10 in fig. 1, the digital dimming control chip 10 in fig. 7 further includes a codeword detection module 104, where the codeword detection module 104 is connected to the processing module 102 and the current control module 103, and the codeword detection module 104 is configured to parse the digital control signal to obtain byte data, and generate a standby control signal when detecting that the byte data is 0.
If the codeword detection module 104 detects that the byte data is not 0, then no standby control signal is generated.
The digital control signal includes status control information, the digital control signal can be output to the codeword detection module 104 through the processing module 102, and then the codeword detection module 104 can analyze and obtain byte data in the digital control signal, and if the byte data is 0, it is indicated that the digital dimming control chip 10 is controlled to enter the standby mode through the digital control signal.
The processing module 102 is further configured to enter a standby mode according to the standby control signal.
The current control module 103 is further configured to enter a standby mode according to a standby control signal.
In the standby mode, the processing module 102 and the current control module 103 are in a stop state, and cannot be connected to external power signals, and the digital dimming control chip 10 cannot digitally adjust the light emitting state of the LED lamp 20; in contrast, if the processing module 102 and the current control module 103 do not receive the standby control signal, neither the processing module 102 nor the current control module 103 enters the standby mode, and the gain control signal and the dimming control signal output by the processing module 102 can flexibly adjust the light emitting state of the LED lamp 20 to meet the digital control requirement of the technician.
As an alternative implementation manner, fig. 8 shows another schematic structure of the digital dimming control chip 10 provided in this embodiment, and, compared to the schematic structure of the digital dimming control chip 10 in fig. 1, the digital dimming control chip 10 in fig. 8 further includes a power-on reset module 105.
The power-on reset module 105 is connected to the processing module 102, and the power-on reset module 105 is configured to perform a reset operation on the processing module 102.
The power-on reset module 105 generates a power-on reset signal, and each processing module 102 can realize a power-on reset function through the power-on reset signal, so that a higher signal serial input and output function can be kept between the processing modules 102, and a control function of a digital control signal is realized, and the processing modules 102 output stable digital information, so that the transmission step and the control step of the digital control signal are simplified, and the control efficiency of the LED lamp 20 is higher; therefore, the digital dimming control chip 10 in this embodiment has higher security and anti-interference performance, so as to prevent the problem that the physical security level of the digital dimming control chip 10 is low because the digital control signal is in a transmission failure state for a long time in the internal transmission process of the digital dimming control chip 10.
Referring to fig. 9 and fig. 10 in combination, fig. 9 shows a schematic structure of a digital dimming control circuit 90 provided in this embodiment, and fig. 10 shows a schematic connection of each circuit module inside the digital dimming control circuit, where the digital dimming control circuit 90 includes at least two cascaded digital dimming control chips as above; the digital dimming control chips are respectively connected with the at least two LED lamps in a one-to-one correspondence mode, and each digital dimming control chip is used for adjusting the light source parameters of the corresponding LED lamp.
Please combine the embodiments of fig. 1 to 8, the light emitting states of the LED lamps can be adjusted synchronously by the digital dimming control circuit 90, so that the digital dimming efficiency of the LED lamps is greatly improved, and the digital dimming cost of the LED lamps is saved.
In the plurality of cascaded digital dimming control chips, the processing modules in the plurality of digital dimming control chips sequentially perform shift processing, latch processing and output gain control signals and dimming control signals on the digital control signals so as to realize a flexible control function on the output current of the corresponding LED lamp.
Specifically, in the digital dimming control circuit 90, since each processing module outputs one path of digital information, the plurality of processing modules are connected to each other, and signal interaction between adjacent processing modules can be achieved; therefore, when the signal access module 101 outputs the digital control signal to the first processing module 102, the digital control signal is rapidly transferred between the cascaded processing modules 102; each digital signal is generated by each processing module 102 and has a specific data frame, then a matching with the corresponding LED lamp 20 can be achieved by the data frame in the data signal, and the light emitting state of the LED lamp 20 can be manipulated by the data signal; therefore, when the digital control signals are output between the cascaded processing modules 102, the processing modules 102 set corresponding data frames for each path of data signals so as to realize accurate control of the LED lamp 20; if the processing module in the last digital dimming control chip performs shift processing and latching processing on the digital control signal, the processing module in the last digital dimming control chip transmits the digital control signal to the signal access module in the next adjacent digital dimming control chip until the processing module in each digital dimming control chip outputs a gain control signal and a dimming control signal matched with the processing module in each digital dimming control chip respectively, so as to complete the forwarding transmission of the digital control signal and the access function of the digital control signal in the plurality of processing modules 102, wherein the digital dimming control chip 10 has higher signal transmission efficiency; each processing module 102 sequentially performs synchronous processing on the digital control information to obtain a corresponding gain control signal and a corresponding dimming control signal, so that the processing module 102 can achieve higher signal conversion efficiency and higher signal serial transmission efficiency, achieve a digital control function with higher precision according to the digital signal, simplify the transmission step and the signal processing step of the digital control signal among a plurality of cascaded digital dimming control chips, and simplify the internal circuit structure and the signal transmission step of the digital dimming control circuit 90.
As an alternative implementation manner, fig. 11 shows another schematic structure of the digital dimming control circuit 110 provided in this embodiment, and compared to fig. 9 and 10, the digital dimming control circuit 110 in fig. 11 further includes: the digital control module 1101, the digital control module 1101 is connected with a first digital dimming control chip in at least two digital dimming control chips, and the digital control module 1101 is used for generating digital control signals.
Therefore, in this embodiment, a digital control signal is generated by the digital control module 1101, and the digital control signal can be transmitted in cascade between cascaded digital dimming control chips, and the light emitting state of each LED lamp is controlled respectively; the present embodiment can implement an accurate digital control function for a plurality of LED lamps through the digital control module 1101.
Wherein the digital control signal further comprises standby control data.
Each digital dimming control chip is also used for entering a standby mode according to standby control data.
In this embodiment, the digital control module 1101 generates standby control data, and each digital dimming control chip can be controlled to enter a standby mode by the standby control data, so that each digital dimming control chip is in a stop state, at this time, the digital dimming control circuit 110 cannot realize a digital dimming function for an LED lamp, and the digital dimming control circuit 110 enters the standby mode; therefore, the digital control module 1101 in this embodiment can directly drive all the digital dimming control chips into the standby mode through the standby control data.
Fig. 12 shows a specific implementation flow of the digital dimming control method provided in this embodiment, by which a high-efficiency digital control function can be implemented for an LED lamp, and a flexible control effect of the LED lamp is implemented, so that a step of adjusting a light emitting state of the LED lamp and a signal transmission flow are greatly simplified; referring to fig. 12, the digital dimming control method includes:
Step S1202: receiving a digital control signal; the digital control signals contain corresponding digital control information, so that the digital control function of the LED lamp can be realized.
Step S1202: the digital control signal is subjected to shift processing and latching processing and then a gain control signal and a dimming control signal are output; by way of example, the gain control information and the dimming control information are obtained by performing shift processing and latch processing on one path of digital control signal, wherein the combination of the gain control information and the dimming control information can meet the circuit function control requirement of technicians, so that the synchronous digital control function of the LED lamp is realized, and the efficiency of digital control is improved.
Step S1203: adjusting the reference current according to the gain control signal to obtain a reference output current, and adjusting the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp; the light-emitting state of the LED lamp can be controlled in real time through the light-adjusting control signal, the running current of the LED lamp can be changed according to the corresponding light-adjusting control signal, so that the ratio between the output current of the LED lamp and the reference output current is equal to the preset current ratio, and the digital light-adjusting response speed and the digital light-adjusting application range of the LED lamp are greatly improved.
It should be noted that, each operation step of the digital dimming control method in fig. 12 corresponds to the digital dimming control chip 10 in fig. 1, so the specific implementation of the digital dimming control method in fig. 10 can refer to the embodiments in fig. 1 to 8, and will not be repeated here.
In the embodiment, gain control signals and dimming control signals are obtained after synchronous processing is performed on one path of digital control signals, so that a rapid input and output function of digital control information is realized, wherein the digital signals contain corresponding circuit control information, so that the synchronous digital control function of the LED lamp can be realized according to the gain control signals and the dimming control signals, the digital dimming control efficiency and the digital dimming control precision of the LED lamp are ensured, and the application range is extremely wide; therefore, the digital dimming control method in the embodiment has an excellent signal conversion function for the digital control signal, has stronger signal compatibility, reduces the transmission cost and the application cost of the digital control signal, has higher signal conversion precision and signal conversion efficiency, ensures the flexibility and the operability of the digital control process of the LED lamp, has higher practical value, realizes better luminous effect under the control of the dimming control signal, meets various visual demands of technicians, and has stronger compatibility; the problems that the digital control steps of the LED lamp are too complicated, the digital dimming function is single, the dimming control effect presented by the LED lamp is poor, and the digital dimming control flexibility is low in the traditional technology are effectively solved.
Fig. 13 shows a schematic structure of the digital dimming control system 130 provided in this embodiment, where the digital dimming control system 130 can be universally applied to various different industrial technical fields to achieve a corresponding digital dimming control effect; referring to fig. 11, the digital dimming control system 130 includes: a digital dimming control circuit 90 and at least two LED lamps as described above; the LED lamp 20 is connected with the digital dimming control chip 10; the digital dimming control chip 10 respectively adjusts the output current of each LED lamp 20 according to one path of digital control signal; the digital dimming control chip 10 can directly perform accurate digital control on the luminous effect of the plurality of LED lamps 20, so that the LED lamps 20 can achieve the digital control effect according to the actual operation demands of technicians, and good visual experience is brought to the technicians.
Therefore, referring to the embodiments of fig. 9 to 11, the digital dimming control system 130 in this embodiment has a simplified module structure, and the digital dimming control circuit 90 can adjust the light emitting state of the LED lamp in real time only by processing and converting one digital control signal, so that the response accuracy and efficiency of digital control are high, and the application range is wide; the digital dimming control system 130 can realize serial input and output of one path of digital control signals, the transmission step of the digital control signals and the digital dimming control step of the LED lamps are greatly simplified, the running states of the LED lamps have higher adjustability and flexibility, the digital dimming control circuit 90 realizes cascade control effects on a plurality of LED lamps according to the digital control information, the digital dimming control circuit 90 can adaptively adjust the electric energy running state of each LED lamp, the luminous effect of the LED lamps can completely meet the actual visual demands of technicians, and the digital dimming control system 130 has higher digital control response performance and higher compatibility; the digital dimming control system 130 in the embodiment has great positive significance for improving the digital dimming effect of the LED lamp, and has great practical production value; the digital dimming control system effectively solves the problems that in the prior art, the digital control steps of a digital dimming control system are complex, the digital dimming function is single, and the digital control precision of an LED lamp is low.
Various embodiments are described herein for various devices, circuits, apparatuses, systems and/or methods. Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and shown in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the specification. It will be appreciated by persons skilled in the art that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
Reference throughout this specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic shown or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without assuming that such combination is not an undue or non-functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Connection references (e.g., attached, coupled, connected, etc.) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, a connective reference does not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be construed broadly and used to provide non-limiting examples of embodiments of the present disclosure, and the present disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from this disclosure.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A digital dimming control chip electrically connected to an LED lamp, the digital dimming control chip comprising:
the signal access module is used for receiving one path of digital control signals; wherein the digital control signal is generated by an external electronic device, and the digital control signal contains digital control information;
the processing module is connected with the signal access module and is used for carrying out shift processing on the digital control signal and latching an output gain control signal and a dimming control signal;
the current control module is connected with the processing module and the LED lamp and is used for adjusting the reference current according to the gain control signal to obtain a reference output current and adjusting the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp.
2. The digital dimming control chip of claim 1, wherein the current control module comprises:
the gain control unit is connected with the processing module and is used for adjusting the reference current according to the gain control signal so as to generate the reference output current; and
And the dimming control unit is connected with the processing module, the gain control unit and the LED lamp and is used for adjusting the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp.
3. The digital dimming control chip of claim 2, wherein the gain control unit comprises:
The first operational amplifier, the first switching tube, the second switching tube, the plurality of reference current sources and the plurality of gain control switching tubes;
Each of the reference current sources is used for outputting the reference current;
A first input end of the first operational amplifier is connected with a first reference voltage, and an output end of the first operational amplifier is connected with a control end of the first switching tube;
The first ends of the reference current sources are respectively connected with a first direct current power supply, the second ends of the reference current sources are respectively connected with the first conducting ends of the gain control switching tubes in a one-to-one correspondence manner, and the second ends of the gain control switching tubes, the first conducting ends of the first switching tubes and the control ends of the second switching tubes are commonly connected to form a current output end of the gain control unit; the control ends of the gain control switch tubes are connected with the processing module;
The second conducting end of the first switching tube and the second input end of the first operational amplifier are commonly connected to the first conducting end of the second switching tube, and the second conducting end of the second switching tube is grounded;
And the current output end of the gain control unit is connected with the dimming control unit.
4. The digital dimming control chip of claim 2, wherein the dimming control unit comprises:
The second operational amplifier, the fourth switching tube, the third switching tubes and the dimming control switching tubes;
The first conducting ends of the dimming control switch tubes are connected with the gain control unit, the control ends of the dimming control switch tubes are connected with the processing module, and the second ends of the dimming control switch tubes are respectively connected with the control ends of the third switch tubes in a one-to-one correspondence manner;
the first input end of the second operational amplifier and the first conducting ends of the plurality of third switching tubes are commonly connected with the first conducting end of the fourth switching tube;
The second conducting ends of the third switching tubes are grounded;
the first input end of the second operational amplifier is connected with a second reference voltage, the output end of the second operational amplifier is connected with the control end of the fourth switching tube, and the first conduction end of the fourth switching tube is connected with the LED lamp.
5. The digital dimming control chip of claim 1, wherein the processing module comprises: the signal processing unit is connected with the current control module;
the signal access unit is used for accessing the digital control signal;
The signal processing unit is used for carrying out shift processing and latch processing on the digital control signal to output the gain control signal and the dimming control signal;
the data forwarding unit is used for forwarding the digital control signals after the shift processing and the latch processing.
6. The digital dimming control chip of claim 5, wherein the signal processing unit comprises:
the bit counter is connected with the signal access unit and is used for accessing a digital control signal and counting pulses in the digital control signal to obtain a counting result;
The shift register is connected with the bit counter and the signal access unit, and is used for accessing the digital control signal and carrying out shift processing on the digital control signal according to the counting result; and
The data latch is connected with the bit counter, the shift register, the data forwarding unit and the current control module and is used for latching the digital control signal after the shift processing.
7. The digital dimming control chip of claim 1, further comprising:
The code word detection module is connected with the processing module and the current control module and is used for analyzing the digital control signal to obtain byte data and generating a standby control signal when detecting that the byte data is 0;
the processing module is also used for entering a standby mode according to the standby control signal;
The current control module is also used for entering a standby mode according to the standby control signal.
8. A digital dimming control circuit connected to at least two LED lamps, wherein the digital dimming control circuit comprises at least two cascaded digital dimming control chips according to any of claims 1-6; the digital dimming control chips are respectively connected with the LED lamps in a one-to-one correspondence mode, and each digital dimming control chip is used for adjusting the corresponding light source parameters of the LED lamp.
9. The digital dimming control circuit of claim 8, wherein the digital dimming control circuit further comprises:
The digital control module is connected with a first digital dimming control chip in at least two digital dimming control chips and is used for generating the digital control signals;
wherein the digital control signal further comprises standby control data;
Each digital dimming control chip is further used for entering a standby mode according to the standby control data.
10. A digital dimming control method, comprising:
Receiving a digital control signal;
the digital control signal is subjected to shift processing and latching processing and then a gain control signal and a dimming control signal are output;
And regulating the reference current according to the gain control signal to obtain a reference output current, and regulating the ratio between the output current of the LED lamp and the reference output current according to the dimming control signal so as to change the light source parameters of the LED lamp.
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| CN112954845A (en) * | 2021-02-04 | 2021-06-11 | 上海晶丰明源半导体股份有限公司 | LED dimming control circuit, method, chip and lighting device |
| CN113870772B (en) * | 2021-10-19 | 2023-05-26 | 中科芯集成电路有限公司 | Light intensity control and trimming circuit and control method for transparent flexible screen lamp beads |
| CN114363421A (en) * | 2021-12-03 | 2022-04-15 | 深圳市明微电子股份有限公司 | Communication method, communication system and storage medium for LED dimming |
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