CN207518048U - A kind of laser diode drive segment light adjusting circuit - Google Patents
A kind of laser diode drive segment light adjusting circuit Download PDFInfo
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- CN207518048U CN207518048U CN201721630139.XU CN201721630139U CN207518048U CN 207518048 U CN207518048 U CN 207518048U CN 201721630139 U CN201721630139 U CN 201721630139U CN 207518048 U CN207518048 U CN 207518048U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a kind of laser diode drive segment light adjusting circuits, are related to circuit engineering, automatic control technology and illumination and field of projection display.It includes synchronous buck type DC/DC chips, chip VIN pins connect input voltage, HG mouthfuls of chip meets high-end metal-oxide-semiconductor M1, LG mouthfuls of chip meets low side metal-oxide-semiconductor M2, output pulse waveform obtains LD driving voltages by inductor L1 and the current sense resistor R1 and capacitance C1, the capacitance C2 of output-parallel that are in series, FB pins feed back foot for the sampling of LD output voltages, it is detected for overvoltage, the pressure drop on wherein detection resistance R1 is input to chip interior comparator by chip SENSE+ and SENSE pin；PWMGH pins, PWMGL pins connect capacitance C1, capacitance C2 respectively again after being connect respectively with metal-oxide-semiconductor M3, metal-oxide-semiconductor M4.The utility model can realize the Fast transforms between the high and low emulation mode of different circuits, horizontal so as to change modulated LD or LED current within the time of several microseconds.
Description
Technical field
The embodiment of the utility model is related to circuit engineering, automatic control technology and illumination and field of projection display, more
Specifically, the embodiment of the utility model is related to a kind of laser diode drive segment light adjusting circuit.
Background technology
LD solid-state laser diode LD and LED semiconductor diode have the long-life, it is efficient, environmentally protective, open
The features such as speed is fast is closed, it is more and more universal in modern times illumination and display field application.It can be seen by its work I-V curve characteristics
Go out, after positive operating voltage is higher than its threshold voltage, it is proportional that positive operating current is similar to same forward voltage.We
Exactly using its this characteristic, different current controls are carried out in illuminating and showing design, to reach different display effects.
It is highly developed at present for the constant current control circuit of LD or LED, for the light modulation electricity of different application
Road is also very universal.Its driving circuit is all the accurate control that electric current is driven by analog or digital PWM mode, reference chart
1, in prior art current adjuster, the voltage at load inductance L both ends is stored in output capacitor C.If load inductance L
Electric current suddenly change, then the voltage in output capacitor C must carry out charge or discharge to match with new modulated current.
Electric current in the transition period, load inductance L does not obtain good control, thus when resulting in the response of slow load current
Between, affect the fast accurate switching for loading different electric currents.Image quality particularly can be directly affected in Projection Display to show
Effect.
Utility model content
The utility model overcomes the deficiencies in the prior art, provides a kind of reality of laser diode drive segment light adjusting circuit
Mode is applied, it is expected to solve the electric current in loading in the prior art because not obtaining good control, causes slowly to load
The current-responsive time, influence different loads electric current fast accurate switching the problem of.
To solve the technical issues of above-mentioned, a kind of embodiment of the utility model uses following technical scheme：One kind swashs
Optical diode drive segment light adjusting circuit, it includes synchronous buck type DC/DC chips, and chip VIN pins connect input voltage, core
HG mouthfuls of piece meets high-end metal-oxide-semiconductor M1, LG mouthfuls of chip meets low side metal-oxide-semiconductor M2, and output pulse waveform is by inductor L1 and is in series
The capacitance C1 of current sense resistor R1 and output-parallel, capacitance C2 obtain LD driving voltages, and FB pins are LD output voltages
Sampling feedback foot, is detected, the pressure drop on wherein detection resistance R1 is inputted by chip SENSE+ and SENSE- pin for overvoltage
To chip interior comparator；Connection is electric respectively again after PWMGH pins, PWMGL pins are connect respectively with metal-oxide-semiconductor M3, MOS pipe M4
Hold C1, capacitance C2；CTRL_H pins and the external resistor voltage divider circuit of CTRL_L pins；PWM pins and CTRL_SEL pins are number
Word controlling switch, wherein PWM pins are used to determine the state of modulated current；CTRL_SEL pins are used to that different capacitances to be controlled to bear
The switching of load controls the conducting of capacitance C1, capacitance C2.
Further technical solution is：CTRL_H the and CTRL_L pins are that there are one 0V to 1.5V full scale models for tool
The simulation input enclosed, for passing through the different output current value limitation of external resistor voltage divider circuit setting height.
Further technical solution is：The FB pins feed back foot for the sampling of LD output voltages, are detected for overvoltage, when
It inputs sampling voltage and is more than 1.3V, chip interior protection circuit starts to control shutdown output.
Further technical solution is：The outer connecting resistance of chip RT pins can be adjusted to ground by adjusting different resistance values
Save switching frequency range 200kHz to 1 MHz.
Further technical solution is：Chip SYNC pins are chip synchronization port, using external sync or internal synchronization,
When chip interior is used to synchronize, need to be grounded.
Further technical solution is：Chip VCL, VCH pin is respectively chip interior low current mode and high current mould
Formula adjusts loop compensation, is compensated with being connected in series to by outer connecting resistance R2 and capacitance C3, the resistance R2 value ranges 15k is arrived
80K, capacitance C3 value ranges 2nF to the 10nF.
Further technical solution is：Chip VCL, VCH pin is respectively chip interior low current mode and high current mould
Formula adjusts loop compensation, is compensated with being connected in series to by outer connecting resistance R2 and capacitance C3, the resistance R2 value ranges 15k is arrived
80K, capacitance C3 value ranges 2nF to the 10nF.
Compared with prior art, one of the beneficial effects of the utility model are：The utility model provides a kind of two pole of laser
Pipe drive segment light adjusting circuit, simple, the operation is stable, reliability height can be achieved between different circuits height and low emulation mode
Fast transforms, so as to change modulated LD or LED levels of current within the time of several microseconds.Suitable high-end DLP projector,
Using the driver of switch output capacitor, high color accuracy is realized.
Description of the drawings
Fig. 1 is current regulation circuit figure in the prior art.
Fig. 2 is a kind of circuit diagram of laser diode drive segment light adjusting circuit of the utility model.
Fig. 3 is a kind of timing control schematic diagram of laser diode drive segment light adjusting circuit of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, with reference to embodiments, to this
Utility model is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain this practicality
It is novel, it is not used to limit the utility model.
Embodiment
With reference to figure 2, a kind of laser diode drive segment light adjusting circuit, including synchronous buck type DC/DC chips, it works
In 450KHZ switching frequencies, averagecurrent mode control, VIN input voltage 10-40V pass through HG mouthfuls of high-end metal-oxide-semiconductors of control of chip
M1 and LG mouthfuls of control low side metal-oxide-semiconductor M2, output pulse waveform are examined by an inductor L1 (about 1.0 μ H) and the electric current being in series
Different capacitance C1, the capacitance C2 of measuring resistance R1 (about 2.5 milliohm) and output-parallel obtain LD driving voltages, wherein detection resistance
Pressure drop on R1 is input to chip interior comparator by chip SENSE+ and SENSE- pin, accurately adjusts inductor L1's
Electric current.In the output voltage range of a 0V to " being less than input voltage rail 2V ", which can be come with ± 6% accuracy
Adjust the electric current in arbitrary load.To realize different current regulation functions, light modulation mouth CTRL_H, CTRL_L can be simulated by chip
The mode being combined with digital PWM mouth realizes accurate, wide scope LED current control.PWM and CTRL_SEL pins are number
Word controlling switch, wherein PWM feet are used to determine the state of modulated current；CTRL_SEL pins control cutting for different capacitive loads
It changes, has both controlled the output of chip PWMGH, PWMGL pin so as to the different loads capacitance that metal-oxide-semiconductor M3 is controlled to be connected with metal-oxide-semiconductor M4
The conducting of C1, capacitance C2；CTRL_H and CTRL_L pins are that there are one 0V to the simulation input of 1.5V full scale ranges for tool, can be led to
Cross the different output current value limitation of external resistor voltage divider circuit setting height.FB pins are anti-for the sampling of LD output voltages
Feed pin detects for overvoltage, and when input sampling voltage is more than 1.3V, chip interior protection circuit starts to control shutdown output.RT pins
It, can be with regulating switch frequency range 200kHz to 1MHz by adjusting different resistance values by outer connecting resistance to ground.SYNC draws
Foot is chip synchronization port, can use external sync, when chip interior is used to synchronize, need to be grounded.VCL pins, VCH draw
Foot is respectively that chip interior low current mode and high current mode adjust loop compensation, is gone here and there by outer connecting resistance R2 and capacitance C3
It compensates with being linked to, wherein resistance R2 value ranges 15k to 80K, capacitance C3 value ranges 2nF to 10nF.Fig. 3 is shown
Corresponding to the timing waveform of the various different conditions of PWM and CTRL_SEL pins.When PWM is low level, all switching manipulations
It will be terminated, and two output capacitance C1, capacitance C2 are with loading disconnecting.
A kind of laser diode drive segment light adjusting circuit provided by the utility model, by using a kind of unique switch
Output capacitor topological structure solves the problems, such as the fast accurate switching for loading different electric currents, which realizes ultrafast
Load current rising and falling time.The basic conception of this topological structure is for some on the basis of constant-current control circuit
Given electric current, the voltage drop for loading both ends are stored in first switch output capacitor.It is a kind of different modulated when needing
During current status, first output capacitor is turned off, and connects second capacitor.This enables each capacitor to store
With it is expected the corresponding load voltage values of modulated current.By using this solely in the external load capacitor for carrying out switching manipulation
Special way is, it can be achieved that Fast transforms between the high and low emulation mode of different circuits, so as within the time of several microseconds
Change modulated LD or LED current is horizontal.
Although reference be made herein to the utility model is described in the explanatory embodiment of the utility model, however, it should
Understand, those skilled in the art can be designed that a lot of other modifications and embodiment, these modifications and embodiment will be fallen
Within spirit disclosed in the present application and spirit.It more specifically, can be to theme group in range disclosed in the present application
The building block and/or layout for closing layout carry out a variety of variations and modifications.In addition to the modification carried out to building block and/or layout
Outer with improving, to those skilled in the art, other purposes also will be apparent.
Claims (6)
1. a kind of laser diode drive segment light adjusting circuit, which is characterized in that it includes synchronous buck type DC/DC chips, core
Piece VIN pins connect input voltage, and HG mouthfuls of chip meets high-end metal-oxide-semiconductor M1, LG mouthfuls of chip connects low side metal-oxide-semiconductor M2, output pulse waveform
LD driving electricity is obtained by inductor L1 and the current sense resistor R1 and capacitance C1, the capacitance C2 of output-parallel that are in series
Pressure, FB pins feed back foot for the sampling of LD output voltages, are detected for overvoltage, and the pressure drop on wherein detection resistance R1 passes through chip
SENSE+ and SENSE- pins are input to chip interior comparator；PWMGH pins, PWMGL pins respectively with metal-oxide-semiconductor M3, metal-oxide-semiconductor
Connect capacitance C1, capacitance C2 after M4 connections respectively again；CTRL_H pins and the external resistor voltage divider circuit of CTRL_L pins；PWM draws
Foot and CTRL_SEL pins are digital control pin, and wherein PWM pins are used to determine the state of modulated current；CTRL_SEL pins
For controlling the switching of different capacitive loads, that is, control the conducting of capacitance C1, capacitance C2.
2. a kind of laser diode drive segment light adjusting circuit according to claim 1, which is characterized in that the CTRL_H and
CTRL_L pins are simulation input of the tool there are one 0V to 1.5V full scale ranges, and the resistor voltage divider circuit for passing through external is set
The different output current value limitation of fixed height.
3. a kind of laser diode drive segment light adjusting circuit according to claim 1, which is characterized in that the FB pins are
The sampling feedback foot of LD output voltages, is detected for overvoltage, and when input sampling voltage is more than 1.3V, chip interior protection circuit rises
Control shutdown output.
4. a kind of laser diode drive segment light adjusting circuit according to claim 1, which is characterized in that outside chip RT pins
Connecting resistance, can be with regulating switch frequency range 200kHz to 1MHz by adjusting different resistance values to ground.
A kind of 5. laser diode drive segment light adjusting circuit according to claim 1, which is characterized in that chip SYNC pins
For chip synchronization port, using external sync or internal synchronization, when chip interior is used to synchronize, need to be grounded.
6. a kind of laser diode drive segment light adjusting circuit according to claim 1, which is characterized in that chip VCL pins,
VCH pins are respectively that chip interior low current mode and high current mode adjust loop compensation, pass through outer connecting resistance R2 and capacitance
C3 is compensated with being connected in series to, resistance R2 value ranges 15k to the 80K, capacitance C3 value ranges 2nF to the 10nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721630139.XU CN207518048U (en) | 2017-11-29 | 2017-11-29 | A kind of laser diode drive segment light adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721630139.XU CN207518048U (en) | 2017-11-29 | 2017-11-29 | A kind of laser diode drive segment light adjusting circuit |
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| Publication Number | Publication Date |
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| CN207518048U true CN207518048U (en) | 2018-06-19 |
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| CN201721630139.XU Active CN207518048U (en) | 2017-11-29 | 2017-11-29 | A kind of laser diode drive segment light adjusting circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111464011A (en) * | 2020-04-24 | 2020-07-28 | 湖南大学 | Variable-load track traffic charger based on PWM capacity regulation and control method |
| CN112086855A (en) * | 2019-06-13 | 2020-12-15 | 海信视像科技股份有限公司 | Laser driving circuit, laser display device and laser driving method |
| CN112116898A (en) * | 2019-06-21 | 2020-12-22 | 厦门雅迅网络股份有限公司 | Power supply circuit of backlight driving module |
-
2017
- 2017-11-29 CN CN201721630139.XU patent/CN207518048U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112086855A (en) * | 2019-06-13 | 2020-12-15 | 海信视像科技股份有限公司 | Laser driving circuit, laser display device and laser driving method |
| CN112116898A (en) * | 2019-06-21 | 2020-12-22 | 厦门雅迅网络股份有限公司 | Power supply circuit of backlight driving module |
| CN111464011A (en) * | 2020-04-24 | 2020-07-28 | 湖南大学 | Variable-load track traffic charger based on PWM capacity regulation and control method |
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