CN210868222U - Digital dimming control chip, digital dimming control circuit and control system - Google Patents
Digital dimming control chip, digital dimming control circuit and control system Download PDFInfo
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- CN210868222U CN210868222U CN201921220913.9U CN201921220913U CN210868222U CN 210868222 U CN210868222 U CN 210868222U CN 201921220913 U CN201921220913 U CN 201921220913U CN 210868222 U CN210868222 U CN 210868222U
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Abstract
A digital dimming control chip, a digital dimming control circuit and a digital dimming control system are provided, the digital dimming control chip includes: the device 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 a 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 of the output current of the LED lamp to the reference output current according to the dimming control signal 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 controllability, and the control response speed is high, so that the light emitting effect of the LED lamp can completely meet the actual visual demand of technicians.
Description
Technical Field
The utility model belongs to the technical field of electronic circuit, especially, relate to a digital dimming control chip, digital dimming control circuit and digital dimming control system.
Background
Along 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 the electronic components, and the electronic components can realize corresponding circuit functions according to operation instructions of technicians; therefore, the digital control mode is favorable for improving the signal processing speed and the signal processing precision of the electronic components, and the electronic components can completely realize the complete automatic control.
However, in the practical application process, when the digital control mode is applied to the electronic component process, more complicated steps are required, and the flexibility of the digital control mode is also lower; for example, when the LED lamp is digitally controlled, not only a complex electronic circuit needs to be used, but also the conventional technology can only implement a simpler control function for the LED lamp in the process of digitally controlling electronic components, for example, the conventional digital control circuit can not accurately change the brightness of the LED lamp according to the actual circuit function requirements of a user, which leads to lower flexibility of the digital adjustment mode of the LED lamp, and can not meet different visual requirements of technicians, thereby reducing the flexibility and compatibility of dimming control of the LED lamp, 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.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a digital dimming control chip, digital dimming control circuit and digital dimming control system aims at solving traditional technical scheme and carries out digital control's in-process to the LED lamp, can't make the luminous effect of LED lamp change according to technical staff's actual demand, and the digital control mode flexibility that leads to the LED lamp is lower, is difficult to the problem of generally being suitable for.
The utility model discloses a first aspect of the embodiment provides a digital dimming control chip, is connected with a LED lamp electricity, digital dimming control chip includes:
the signal access module is used for receiving a path of digital control signal;
the processing module is connected with the signal access module and is used for performing shift processing on the digital control signal and latching and outputting a gain control signal and a dimming control signal;
and the current control module is connected with the processing module and the LED lamp, and is used for adjusting a reference current according to the gain control signal to obtain a reference output current and adjusting the ratio of the output current of the LED lamp to 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 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
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 of the output current of the LED lamp to 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 comprises:
the gain control circuit comprises a first operational amplifier, a first switch tube, a second switch tube, a plurality of reference current sources and a plurality of gain control switch tubes;
each reference current source 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 plurality of reference current sources are connected with a first direct current power supply, the second ends of the plurality of reference current sources are respectively connected with the first conduction ends of the plurality of gain control switch tubes in a one-to-one correspondence manner, and the second ends of the plurality of gain control switch tubes, the first conduction ends of the first switch tubes and the control ends of the second switch tubes are connected in common 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 connected to the first conducting end of the second switching tube in common, 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, a plurality of third switching tubes and a plurality of dimming control switching tubes;
the first conducting ends of the dimming control switch tubes are connected to the gain control unit, the control ends of the dimming control switch tubes are connected to 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;
a first input end of the second operational amplifier and a first conducting end of the plurality of third switching tubes are commonly connected to a first conducting end of the fourth switching tube;
the second conducting ends of the plurality of third switching tubes are all grounded;
and a first input end of the second operational amplifier is connected with a second reference voltage, an output end of the second operational amplifier is connected with a control end of the fourth switching tube, and a first conduction end of the fourth switching tube is connected with the LED lamp.
In one embodiment, the processing module comprises: the signal access unit, the signal processing unit and the data forwarding unit are sequentially connected, and 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 performing shift processing and latch processing on the digital control signal and outputting the gain control signal and the dimming control signal;
the data forwarding unit is used for forwarding the digital control signal 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 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 shifting the digital control signal according to the counting result; and
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 the embodiments of the present invention provides a digital dimming control circuit, connected to at least two LED lamps, wherein the digital dimming control circuit includes at least two cascaded digital dimming control chips as described above; the at least two 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 light source parameters of the corresponding 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 of the at least two digital dimming control chips and is used for generating the digital control signal;
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 the standby control data.
A third aspect of the embodiments of the present invention provides a digital dimming control system, including:
the digital dimming control circuit as described above; and
at least two LED lamps;
the digital dimming control circuit is connected with the LED lamp.
The digital dimming control chip can perform synchronous digital regulation on the light emitting state of the LED lamp, so that the LED lamp can realize various different light emitting effects according to the actual requirements of technicians, the actual visual requirements of the technicians are met, and the control flexibility is high; the digital dimming control chip has a relatively simplified circuit module structure, a path of digital control signal is accessed through the signal receiving module, and the gain control signal and the dimming control signal are output after the digital control signal is processed, so that multifunctional dimming of the LED lamp is realized, the digital control efficiency and the digital control precision of the LED lamp are greatly improved, and the controllability is relatively strong; therefore, in the embodiment of the present invention, the digital dimming control chip can realize the parallel conversion output of the digital control signal, the output current of the LED lamp is changed in real time through the dimming control signal, and the ratio between the output current of the LED lamp and the reference output current is equal to the preset current ratio, so that the light source parameter of the LED lamp is changed in a self-adaptive manner, and further the light emitting state of the LED lamp can meet the actual visual demand of the technician, and the light emitting state control effect of the LED lamp is better; the digital dimming control chip can perform self-adaption and comprehensive adjustment on the light emitting state of the LED lamp according to the actual requirements of technicians, and can be compatibly suitable for different industrial technical fields; therefore, the defects that the flexibility of digital dimming control on the LED lamp is low and the light-emitting effect of the LED lamp cannot meet the actual visual requirements of technicians in the traditional technology are overcome.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
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 structural diagram of a current output module according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a gain control unit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a dimming control unit according to an embodiment of the present invention;
fig. 5 is a schematic structural 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 structural diagram of a digital dimming control chip according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a digital dimming control chip according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a digital dimming control circuit according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a connection relationship between circuit modules in a digital dimming control circuit according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a digital dimming control circuit according to an embodiment of the present invention;
fig. 12 is a schematic view of a specific flow chart 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
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the "LED lamp" referred to herein includes various different types of LED lamps in the art, and the type of LED lamp is not limited herein; therefore the embodiment of the utility model provides an in digital dimming control chip 10 can carry out multi-functional digital control to the luminous effect of various types of LED lamps, the flexibility is higher, and compatibility is stronger.
Referring to fig. 1, an embodiment of the present invention provides a schematic structural diagram of a digital dimming control chip 10, in which the digital dimming control chip 10 is electrically connected to an LED lamp 20, and the digital dimming control chip 10 can flexibly adjust the light emitting state of the LED lamp 20, so that the light emitting state of the LED lamp 20 can be adaptively changed according to the actual requirement of a technician, and then the LED lamp 20 can be widely applied to different industrial technologies, and the optimal dimming control effect is achieved; the digital dimming control chip 10 in this embodiment can implement a flexible and complete digital dimming control function for the LED lamp 20; for convenience of explanation, only the parts related to the present embodiment are shown, and detailed 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.
Illustratively, the digital control signal is generated by an external electronic device, and the digital control signal includes digital control information, so the digital dimming control chip 10 in this embodiment is compatible for use in different circuit systems, and the digital dimming control chip 10 can change the operating state of each circuit module in the digital dimming control chip 10 in real time through the digital control signal, and 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 step of the digital dimming control chip 10 is 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 to the signal access module 101, and the processing module 102 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 processing module 102 has functions of signal transmission and signal forwarding, the processing module 102 receives a 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 a path of digital information; therefore, in this embodiment, the processing module 102 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 the conversion rate of the digital control signal; therefore, after the digital control signal is subjected to shift processing and latch processing by the processing module 102, 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 to 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 as to change a light source parameter of the LED lamp 20.
The current control module 103 can accurately obtain 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 to obtain a reference output current with a specific amplitude; the reference output current provides current reference information in the digital dimming control process of the LED lamp so as to change the electric energy running state in the LED lamp; therefore, the current control module 103 in this embodiment adjusts the reference current according to the gain control signal to output reference output currents with different preset amplitudes, and the current control module 103 can implement a flexible signal conversion function for the light emitting state of the LED lamp; therefore, the present embodiment implements a multifunctional digital control function according to the reference output current, so that the lighting state of the LED lamp can be adaptively adjusted, and the flexibility and stability of signal processing of the digital dimming control chip 10 are guaranteed.
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 the preset current ratio, and for example, the ratio between the output current of the LED lamp 20 and the reference output current is 500 by the dimming control signal: 1, 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 demand of the technician; the current control module 103 can change the output current of the LED lamp 20 according to the dimming control signal.
In the structural schematic of the digital dimming control chip 10 shown in fig. 1, the digital dimming control chip 10 can implement a flexible adjustment function for the light emitting state of an LED lamp, and further, the structural schematic of the digital dimming control chip 10 has a flexible and compatible circuit structure, can implement adaptive adjustment for the light emitting state of the LED lamp, and has strong expandability; the digital dimming control chip 10 in this embodiment can realize a multifunctional digital adjustment function for the light emitting effect of the LED lamp 20, and the gain control signal and the dimming control signal are obtained in sequence by processing and converting the digital control signal, so that the light emitting state of the LED lamp is flexibly adjusted by the dimming control signal, and the operation and control are simple and convenient; therefore, the digital dimming control chip 10 realizes a flexible digital control function on the light emitting state of the LED lamp, so that the light emitting effect of the LED lamp can meet the actual circuit function requirements of technicians; the problem of digital control mode single to the dimming function of LED lamp among the traditional art, digital control mode's flexibility is lower, leads to the dimming control effect of LED lamp can't satisfy technical staff's actual visual demand is effectively solved.
As an optional implementation manner, fig. 2 shows a schematic structure of the current control module 103 provided in this embodiment, please refer to fig. 2, where 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 so 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 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 used as the current reference information, so that the ratio of the output current of the LED lamp 20 to the reference output current presents a specific proportional relationship, and the digital dimming function for the LED lamp 20 is realized.
Therefore, the present embodiment, in combination with the gain control unit 1031 and the dimming control unit 1032, can precisely adjust the power operation condition of the LED lamp 20.
As an alternative implementation, fig. 3 shows a specific circuit structure of the gain control unit 1031 provided in this embodiment, please refer to fig. 3, the gain control unit 1031 includes: the amplifier comprises a first operational amplifier Op1, a first switch tube M1, a second switch tube M2, a plurality of reference current sources (represented by Ir1, … IrN in FIG. 3, wherein N is a positive integer greater than 1) and a plurality of gain control switch tubes (represented by D1, … DN in FIG. 3).
Each reference current source is used for outputting a 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 switch tube M1.
The first ends of the multiple reference current sources are all connected with a first direct current power source VCC1, the second ends of the multiple reference current sources are respectively connected with the first conduction ends of the multiple gain control switch tubes in a one-to-one correspondence manner, and the second ends of the multiple gain control switch tubes, the first conduction end of the first switch tube M1 and the control end of the second switch tube M2 are connected in common to form a current output end of the gain control unit 1031; the control ends of the gain control switch tubes are all connected with the processing module 102; furthermore, the gain control signal output by the processing module 102 can enable a plurality of gain control switching tubes to be turned on or off, and illustratively, the level state of the gain control signal is changed to enable the corresponding gain control switching tube to be turned on or off; only when the gain control switch tube is conducted, the reference current source correspondingly connected with the gain control switch tube can output the reference current with the preset amplitude.
The second conducting terminal of the first switch transistor M1 and the second input terminal of the first operational amplifier Op1 are commonly connected to the first conducting terminal of the second switch transistor M2, and the second conducting terminal of the second switch transistor M2 is grounded to GND.
The current output terminal of the gain control unit 1031 is connected to the dimming control unit 1032.
Optionally, the first switching tube M1 is an MOS tube or an audion, and the second switching tube M2 is an MOS tube or an audion; illustratively, the first switch transistor M1 is a PMOS transistor, a drain of the PMOS transistor is a first conducting terminal of the first switch transistor M1, a gate of the PMOS transistor is a control terminal of the first switch transistor M1, and a source of the PMOS transistor is a second conducting terminal of the first switch transistor M1, so that the gain control unit 1031 has a simplified and compatible circuit structure.
Optionally, the first input terminal of the first operational amplifier Op1 is a positive phase input terminal or a negative phase input terminal 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 configuration of the gain control unit 1031 shown in fig. 3, a voltage clamping function can be implemented by combining the first operational amplifier Op1, the first switch tube M1 and the second switch 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 present embodiment respectively controls the on or off of the gain control switch tubes through the gain control signal, 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 present embodiment can change the current output states of a plurality of reference current sources in real time; the currents which can be output by directly combining the plurality of reference current sources with each other have any amplitude, so that the digital control precision and the control stability of the LED lamp are guaranteed. As an alternative implementation, fig. 4 shows a specific circuit structure schematic of the dimming control unit 1032 provided in this embodiment, please refer to fig. 4, where the dimming control unit 1032 includes: the second operational amplifier Op2, a fourth switching tube M2, a plurality of third switching tubes (fig. 4 is represented by D21, D22, … D2P, wherein P is a positive integer greater than or equal to 2), and a plurality of dimming control switching tubes (fig. 4 is represented by M31, M32, … M3P).
The first conduction ends of the dimming control switch tubes are all connected to the gain control unit 1031, the control ends of the dimming control switch tubes are all 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 then the dimming control signal output by the processing module 102 can change the on or off state of the corresponding dimming control switch tube.
A first input terminal of the second operational amplifier Op2 and a first conductive terminal of the plurality of third switching tubes are commonly connected to a first conductive terminal of the fourth switching tube M4.
The second conducting terminals of the plurality of third switching tubes M3 are all connected to the ground 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 transistor or a triode, wherein 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 of the dimming control unit 1032 shown in fig. 4, when the control end of the dimming control switch tube receives the dimming control signal, the level state of the dimming control signal can control the corresponding dimming control switch tube to be turned on or off, so that the corresponding third switch tube can be turned on or off; for example, when 3 third switching tubes in the dimming control unit 1032 are turned on, the total current output by the dimming control unit 1032 is equal to 3 times of the reference output current, and the ratio between the output current of the LED lamp and the reference output current is 3: 1; therefore, in the present embodiment, the on/off of the plurality of third switching tubes is controlled to flexibly adjust the ratio between the output current of the LED lamp 20 and the reference output current, and the output current of the LED lamp 20 has simpler operation steps.
As an alternative implementation, fig. 5 shows a schematic structure of the processing module 102 provided in this embodiment, please refer to fig. 5, where the processing module 102 includes: the signal access unit 1021, the signal processing unit 1022 and the data forwarding unit 1023 are connected in sequence, the signal processing unit 102 is connected with the current control module 103, and the signal processing unit 102 can output the gain control signal and the dimming control signal to the current control module 103 so as to change the working state of the current control module 103.
The signal access unit 1021 is used for accessing the 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 forwarding unit 1023 is used for forwarding the digital control signals after the shift processing and the latch processing.
Optionally, the data forwarding unit 1023 is connected to the next chip, and then the data forwarding unit 1023 can change the digital control signal to the next chip, so the processing module 102 in this embodiment has higher communication compatibility and signal transmission stability.
Therefore, in this embodiment, when the digital dimming control chip 10 performs digital control on the light emitting states of the LED lamps 20, the signal access unit 1021 and the data forwarding unit 1023 are combined to achieve cascade transmission of digital control signals, and then the processing module 102 can generate corresponding gain control signals and dimming control signals according to the digital control signals, so as to achieve flexible adjustment on 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, fig. 6 shows a schematic structure of the signal processing unit 1022 provided in this embodiment, please refer to fig. 6, where 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 accessing unit 1021, and the bit counter 601 is used for accessing the 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 real-time counting function 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 obtained 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 analyze the control information in the digital control signal more comprehensively, and improve the processing accuracy and the 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 configured to access the digital control signal and perform 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 digital control signal after the shift 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 this embodiment can implement data shift on the digital control signal, so that the digital control signal output by the shift register 602 contains specific digital control information to implement a 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 forwarding unit 1023, and the current control module 103, and the data latch 603 is used for latching the digital control signal after the shift processing.
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, thereby avoiding a phenomenon that the digital information is lost in the internal transmission process of the digital dimming control chip 10, and the digital dimming control chip 10 in this embodiment can realize a safer and more stable digital control function according to the gain control signal and the dimming control signal, has a wider application range, and is beneficial to improving the digital control response accuracy 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 complexity of transmission and processing steps of the digital control signal is reduced.
As an optional implementation manner, fig. 7 shows another structural schematic of the digital dimming control chip 10 provided in this embodiment, and compared with the structural schematic 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, 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 analyze 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, the standby control signal is not generated.
The digital control signal includes state control information, and the processing module 102 can output the digital control signal to the codeword detection module 104, and then the codeword detection module 104 can analyze byte data in the digital control signal, and if the byte data is 0, it indicates that the digital dimming control chip 10 is controlled by the digital control signal to enter the standby mode.
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 the standby control signal.
In the standby mode, the processing module 102 and the current control module 103 are both in a stop state, and cannot access an external power signal, and the digital dimming control chip 10 cannot digitally adjust the light emitting state of the LED lamp 20; on the contrary, if the processing module 102 and the current control module 103 do not receive the standby control signal, the processing module 102 and the current control module 103 do not enter the standby mode, and the light emitting state of the LED lamp 20 can be flexibly adjusted by the gain control signal and the dimming control signal output by the processing module 102, so as to meet the digital control requirement of the technician.
As an alternative implementation, fig. 8 shows another structural schematic of the digital dimming control chip 10 provided in this embodiment, and compared with the structural schematic 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, each processing module 102 can realize a power-on reset function through the power-on reset signal, a higher signal serial input and output function can be maintained between the processing modules 102, a control function of a digital control signal is realized, and the processing module 102 outputs stable digital information, so that not only are transmission steps and control steps of the digital control signal simplified, but also the control efficiency of the LED lamp 20 is higher; therefore, the digital dimming control chip 10 in this embodiment has higher safety and anti-interference performance, and prevents the digital control signal from being in a transmission failure state for a long time in the internal transmission process of the digital dimming control chip 10, which results in a problem that the physical safety level of the digital dimming control chip 10 is low.
Referring to fig. 9 and fig. 10 in combination, fig. 9 shows a structural schematic diagram of the digital dimming control circuit 90 provided in this embodiment, and fig. 10 shows a connection schematic diagram of each circuit module inside the digital dimming control circuit, wherein the digital dimming control circuit 90 includes at least two cascaded digital dimming control chips as above; the LED lamp comprises at least two LED lamps, at least two digital dimming control chips and a power supply, wherein the at least two digital dimming control chips are respectively connected with the at least two LED lamps in a one-to-one correspondence manner, and each digital dimming control chip is used for adjusting the light source parameters of the corresponding LED lamp.
With reference to the embodiments of fig. 1 to fig. 8, the digital dimming control circuit 90 can synchronously adjust the light emitting states of a plurality of LED lamps, thereby greatly improving the digital dimming efficiency of the LED lamps and saving the digital dimming cost of the LED lamps.
In the cascaded digital dimming control chips, the processing modules in the digital dimming control chips sequentially perform shift processing and latch processing on the digital control signals and output gain control signals and dimming control signals so as to realize the flexible control function of 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 processing modules are connected to each other, and signal interaction between adjacent processing modules can be realized; therefore, when the signal access module 101 outputs the digital control signal to the first processing module 102, the digital control signal is rapidly transmitted between the cascaded processing modules 102; each digital signal is generated by each processing module 102 and has a specific data frame, so that the data frame in the data signal can be matched with the corresponding LED lamp 20, and the lighting state of the LED lamp 20 can be controlled by the data signal; therefore, when the digital control signal is output between the cascaded processing modules 102, the processing modules 102 set a corresponding data frame for each data signal to realize accurate control of the LED lamp 20; if the processing module in the previous digital dimming control chip performs the shift processing and the latch processing on the digital control signal, the processing module in the previous 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 the gain control signal and the dimming control signal matched with the processing module in the previous digital dimming control chip respectively, so as to complete the forwarding transmission and digital control signal access functions of the digital control signals in the plurality of processing modules 102, and the digital dimming control chip 10 has higher signal transmission efficiency inside; 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 realize higher signal conversion efficiency and signal serial transmission efficiency, and realize a digital control function with higher precision according to the digital signals, thereby simplifying the transmission steps and the signal processing steps of the digital control signals among a plurality of cascaded digital dimming control chips, and the internal circuit structure and the signal transmission steps of the digital dimming control circuit 90 are simpler.
As an alternative implementation, fig. 11 shows another structural schematic of the digital dimming control circuit 110 provided in this embodiment, and compared with fig. 9 and fig. 10, the digital dimming control circuit 110 in fig. 11 further includes: the digital control module 1101, the digital control module 1101 is connected to a first digital dimming control chip of the at least two digital dimming control chips, and the digital control module 1101 is configured to generate a digital control signal.
Therefore, in the present embodiment, a digital control signal is generated by the digital control module 1101, and the digital control signal can be cascade-transmitted between the cascade-connected digital dimming control chips, and the light emitting state of each LED lamp is controlled respectively; the present embodiment can implement a precise 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 the standby control data.
In the embodiment, the digital control module 1101 generates standby control data, and each digital dimming control chip can be controlled to enter the standby mode through 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 the LED lamp, and then 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 to enter 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, which can implement an efficient digital control function for an LED lamp, and implement a flexible control effect of the LED lamp, thereby greatly simplifying an adjustment step of a light emitting state of the LED lamp and a signal transmission flow; referring to fig. 12, the digital dimming control method includes:
step S1202: receiving a digital control signal; the digital control signal contains corresponding digital control information, and the digital control function of the LED lamp can be realized.
Step S1202: the digital control signal is subjected to shift processing and latch processing and then a gain control signal and a dimming control signal are output; illustratively, a path of digital control signal is subjected to shift processing and latch processing to obtain gain control information and dimming control information, wherein the gain control information and the dimming control information are combined to meet the circuit function control requirements of technicians, so that the synchronous digital control function of the LED lamp is realized, and the digital control efficiency is improved.
Step S1203: adjusting the reference current according to the gain control signal to obtain a reference output current, and adjusting the ratio of the output current of the LED lamp to the reference output current according to the dimming control signal to change the light source parameters of the LED lamp; the luminous state of the LED lamp can be controlled in real time through the dimming control signal, the LED lamp can change the running current of the LED lamp according to the corresponding dimming control signal, so that the ratio between the output current of the LED lamp and the reference output current is equal to a preset current ratio, and the digital dimming response speed and the digital dimming application range of the LED lamp are greatly improved.
It should be noted that, the operation steps of the digital dimming control method in fig. 12 correspond to those of the digital dimming control chip 10 in fig. 1, and thus, reference may be made to the embodiments of fig. 1 to fig. 8 for specific implementation of the digital dimming control method in fig. 10, and details will not be repeated here.
In the embodiment, a gain control signal and a dimming control signal are obtained after a path of digital control signal is synchronously processed, so that the rapid input and output function of digital control information is realized, wherein the digital signal comprises corresponding circuit control information, so that the synchronous digital control function of the LED lamp can be realized according to the gain control signal and the dimming control signal, 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, the signal compatibility is strong, the transmission cost and the application cost of the digital control signal are reduced, the digital signal has higher signal conversion precision and signal conversion efficiency, the flexibility and the controllability of the digital control process of the LED lamp are ensured, the practical value is higher, the LED lamp realizes a better light-emitting effect under the control of the dimming control signal, various visual requirements of technicians are met, and the compatibility is stronger; the problems that the digital control steps of the LED lamp in the traditional technology are too complicated, the digital dimming function is single, the dimming control effect of the LED lamp is poor, and the digital dimming control flexibility is low are effectively solved.
Fig. 13 shows a structural schematic diagram of the digital dimming control system 130 provided in this embodiment, and the digital dimming control system 130 can be universally applied to various different industrial technical fields to achieve corresponding digital dimming control effects; referring to fig. 11, the digital dimming control system 130 includes: the digital dimming control circuit 90 and the at least two LED lamps as described above; wherein, 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 a digital control signal; the digital dimming control chip 10 can directly perform accurate digital control on the light emitting effect of the plurality of LED lamps 20, so that the LED lamps 20 can realize the digital control effect according to the actual operation requirement of technicians, and good visual experience is brought to the technicians.
Therefore, referring to the embodiments of fig. 9 to fig. 11, the digital dimming control system 130 in this embodiment has a relatively simplified module structure, and the digital dimming control circuit 90 can adjust the light emitting state of the LED lamp in real time only after processing and converting one path of digital control signal, so that the response accuracy and efficiency of digital control are high, and the application range is wide; further, the digital dimming control system 130 can realize serial input and output of one path of digital control signal, transmission steps of the digital control signal and digital dimming control steps of the LED lamps are greatly simplified, the running state of the LED lamps has higher adjustability and flexibility, the digital dimming control circuit 90 realizes a cascade control effect on a plurality of LED lamps according to digital control information, the digital dimming control circuit 90 can perform self-adaptive adjustment on the electric energy running state of each LED lamp, the light emitting effect of the LED lamps can completely meet the actual visual demand of technicians, 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 a great positive significance for improving the digital dimming effect of the LED lamp, and has a great practical production value; 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 are effectively solved.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated 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 description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown 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 the 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, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in 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 illustrated 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 presuming that such combination is not an illogical or 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. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do 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 interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the 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 the disclosure.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A digital dimming control chip electrically connected to an LED lamp, said digital dimming control chip comprising:
the signal access module is used for receiving a path of digital control signal;
the processing module is connected with the signal access module and is used for performing shift processing on the digital control signal and latching and outputting a gain control signal and a dimming control signal;
and the current control module is connected with the processing module and the LED lamp, and is used for adjusting a reference current according to the gain control signal to obtain a reference output current and adjusting the ratio of the output current of the LED lamp to 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
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 of the output current of the LED lamp to 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 gain control circuit comprises a first operational amplifier, a first switch tube, a second switch tube, a plurality of reference current sources and a plurality of gain control switch tubes;
each reference current source 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 plurality of reference current sources are connected with a first direct current power supply, the second ends of the plurality of reference current sources are respectively connected with the first conduction ends of the plurality of gain control switch tubes in a one-to-one correspondence manner, and the second ends of the plurality of gain control switch tubes, the first conduction ends of the first switch tubes and the control ends of the second switch tubes are connected in common 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 connected to the first conducting end of the second switching tube in common, 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, a plurality of third switching tubes and a plurality of dimming control switching tubes;
the first conducting ends of the dimming control switch tubes are connected to the gain control unit, the control ends of the dimming control switch tubes are connected to 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;
a first input end of the second operational amplifier and a first conducting end of the plurality of third switching tubes are commonly connected to a first conducting end of the fourth switching tube;
the second conducting ends of the plurality of third switching tubes are all grounded;
and a first input end of the second operational amplifier is connected with a second reference voltage, an output end of the second operational amplifier is connected with a control end of the fourth switching tube, and a 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 access unit, the signal processing unit and the data forwarding unit are sequentially connected, and 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 performing shift processing and latch processing on the digital control signal and outputting the gain control signal and the dimming control signal;
the data forwarding unit is used for forwarding the digital control signal 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 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 shifting the digital control signal according to the counting result; and
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 one of claims 1 to 6; the at least two 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 light source parameters of the corresponding LED lamp.
9. The digital dimming control circuit of claim 8, further comprising:
the digital control module is connected with a first digital dimming control chip of the at least two digital dimming control chips and is used for generating the digital control signal;
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 the standby control data.
10. A digital dimming control system, comprising:
the digital dimming control circuit of any of claims 8-9; and
at least two LED lamps;
the digital dimming control circuit is connected with the LED lamp.
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| CN201921220913.9U CN210868222U (en) | 2019-07-29 | 2019-07-29 | Digital dimming control chip, digital dimming control circuit and control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461059A (en) * | 2019-07-29 | 2019-11-15 | 深圳市明微电子股份有限公司 | A kind of digital dimming control chip, digital dimming control circuit and control method |
| CN114863887A (en) * | 2022-07-06 | 2022-08-05 | 北京显芯科技有限公司 | Dimming device, method, system and storage medium |
-
2019
- 2019-07-29 CN CN201921220913.9U patent/CN210868222U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461059A (en) * | 2019-07-29 | 2019-11-15 | 深圳市明微电子股份有限公司 | A kind of digital dimming control chip, digital dimming control circuit and control method |
| CN114863887A (en) * | 2022-07-06 | 2022-08-05 | 北京显芯科技有限公司 | Dimming device, method, system and storage medium |
| CN114863887B (en) * | 2022-07-06 | 2022-11-01 | 北京显芯科技有限公司 | Dimming device, method, system and storage medium |
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