CN106773452B - Camera light source linkage control digital power supply - Google Patents
Camera light source linkage control digital power supply Download PDFInfo
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- CN106773452B CN106773452B CN201710086381.3A CN201710086381A CN106773452B CN 106773452 B CN106773452 B CN 106773452B CN 201710086381 A CN201710086381 A CN 201710086381A CN 106773452 B CN106773452 B CN 106773452B
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- light source
- signal
- power supply
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- camera
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a camera light source linkage control digital power supply, which comprises a controller: the pulse width modulation circuit is used for outputting a light source level pulse width modulation signal and a power supply level signal; digital control analog switch: the light source level pulse width modulation signal controls the output of the power supply level signal or the grounding level signal at the output end; two-stage RC filter circuit: the input end is connected with the output end of the digital control analog switch, and the output end is used for outputting continuous light source level signals. The camera light source linkage control digital power supply can output continuous light source level signals, and dark areas do not appear during high-speed shooting.
Description
Technical Field
The invention relates to a digital power supply, in particular to a camera light source linkage control digital power supply.
Background
The power supply of existing vision control systems uses PWM (pulse width modulation) control, with the use of a high resolution counter, the duty cycle of the square wave being modulated to encode the level of a particular analog signal. At any given moment, a voltage or current source is applied to the analog load in a repeating pulse sequence of ON (ON) or OFF (OFF), and it may happen that the shot is just in the dark area (OFF) at the time of high-speed shooting, which causes the contrast of the shot image to be inconsistent and affects the imaging quality.
Disclosure of Invention
The invention provides a camera light source linkage control digital power supply, which solves the problem of dark areas in high-speed shooting.
The technical scheme of the invention is as follows: a camera light source coordinated control digital power supply comprises a controller: the pulse width modulation circuit is used for outputting a light source level pulse width modulation signal and a power supply level signal; digital control analog switch: the light source level pulse width modulation signal controls the output of the power supply level signal or the grounding level signal at the output end; two-stage RC filter circuit: the input end of the digital control analog switch is connected with the output end of the digital control analog switch, and the output end of the two-stage RC filter circuit is used for outputting continuous light source level signals.
And further, the controller comprises a signal follower, and a power supply level signal output by the controller is connected to the digital control analog switch through the signal follower.
Further, the light source level pulse width modulation signal is connected to the controller, and is used as a control feedback signal of the light source level pulse width modulation signal output by the controller.
Furthermore, the output end of the two-stage RC filter circuit is connected with a voltage follower, and the output end of the voltage follower is used for outputting continuous light source level signals.
Further, the controller outputs a light source trigger signal, the light source trigger signal is used for switching on and off of the light source switch circuit, the light source trigger signal is used as a camera trigger signal through the timer, and the camera trigger signal is used for triggering the camera to work.
Further, the light source level pulse width modulation signal and the power supply level signal output by the controller are respectively provided with two paths, and the digital control analog switch is CD 4053.
Further, the controller controls a light source trigger signal by a user trigger signal, and the user trigger signal is input to the controller through the optocoupler and the inverter.
The technical scheme provided by the invention has the advantages that: the digital control analog switch utilizes the light source level pulse width modulation signal and the power supply level signal to coordinately control and output the level signal which changes along with the light source level pulse width modulation signal, and continuous light source level signal output controlled by the light source level pulse width modulation signal at any time can be obtained after filtering by the two-stage RC filter circuit, so that the brightness of a light source is continuously controlled, and the dark space phenomenon during high-speed shooting is avoided. Through the time delay processing of the light source trigger signal, the light source can trigger the camera to shoot when reaching stable brightness, and the shooting stability is ensured.
Drawings
Fig. 1 is a schematic circuit diagram of a camera light source linkage control digital power supply.
Fig. 2 is a schematic diagram of a processing circuit structure for controlling the output of the controller in the digital power supply with the camera light source linkage.
FIG. 3 is a graph illustrating a comparison of current output for level PWM and the present invention.
FIG. 4 is a schematic diagram of a light source and camera synchronous trigger circuit in a camera light source linkage control digital power supply.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto.
The circuit structure of the camera light source linkage control digital power supply of the embodiment is shown in fig. 1, and comprises:
triggering input 1 four ways (the user gives input 5-30V), the optocoupler 2 is isolated and enters the controller 4 through the inverter 3(74HC04), the controller 4 model ARM-STM32F103RCT6, hereinafter referred to as STM32, the optocoupler 2 adopts TLP117, can reach 50M input frequency to adapt to the high-speed acquisition requirement, and the inverter 3 enables the input signal to be shaped so as to facilitate accurate identification of STM 32.
Light source luminance control 5: the STM32 outputs two paths of power supply level signals (DA1 and DA2) which pass through the signal follower 51, the two paths of power supply level signals are input into the digital control analog switch 52(CD4053) and then divided into four paths of control signals to be output, and the level values of the four paths of signals are controlled by a light source level Pulse Width Modulation (PWM) signal output by the STM 32. The four paths of control signals are output and then are subjected to operational amplification to control the brightness of the light source, and the two paths of DA signals enter the ARM through the ADC pin to accurately control the magnitude of the DA output value.
Light source trigger signal 6: the light-emitting time and the light-emitting time delay can be set when the rising edge and the falling edge are selected for triggering under the control of the trigger input 1, and four paths of linkage control can be realized.
Camera trigger signal 7: the camera trigger signal is a signal output by the reference light source trigger signal 6, and can be output after the output time, namely time delay, is set in the upper computer software, so that the maximum brightness of the light source when the camera picks the image is ensured. The camera trigger signal 7 adopts a P-channel field effect transistor, the output voltage is ensured to reach 5V, and the output end is connected with a 560R resistor in series, so that the output current is convenient to be butted with other control circuits at about 10 ma.
The data storage 8: with 24LC64, communication mode I2C saves setup content for offline use.
485 and ethernet communication 9: serial port 1 communication is used together, and 74HC08 is used for converting the communication level so that 485 and Ethernet work simultaneously.
AC-DC conversion: the light source uses voltage 24V, STM32 uses voltage 3.3V, and the light source control signal uses 15V, and 485 chip charactron etc. uses 5V.
The nixie tube 10 controls: the nixie tube 10 adopts a 5-bit common type, and the bits and the segments are controlled by STM32 to control the display value.
Referring to fig. 2, the light source brightness control process is that STM32 outputs two paths of signals for controlling the light source through DA, outputs two paths of PWM signals to coordinate and control the output of 256-level precision-changing level signals, and outputs continuous light source level signals after passing through the processing circuit. Specifically, two paths of DA outputs of STM32 are connected with pins 14 and 15 of CD4053 through signal followers, two paths of PWM signals are connected with pins 10 and 11 of CD4053, and pins 1, 2, 12 and 13 of CD4053 are four paths of outputs. STM32 outputs two signals DA1 and DA2 which are fed back to ADC1 and ADC2 of STM32, and STM32 accurately controls DA1 and DA2 output quantity according to the input of the ADC. On the other hand, the signal strength of DA1 and DA2 is increased through the signal follower 51, the load of the controller 4 is reduced, the signals are input into the CD4053 to be divided and converted to output four paths of level signals, the four paths of level signals are adjusted according to different duty ratios of the PWM signal output by the STM32 to output 0-255 levels of level, and the four paths of level signals are filtered by the two-stage RC filter circuit 53 and then output continuous light source level signals through the voltage follower (not shown in the figure) formed by an operational amplifier to control the brightness of the light source. The voltage obtained by performing two-stage RC filtering on the output voltage can be represented by the following formula:
where T is the system-specified clock period, τ is the level pulse period output by CD4053, VMIs the reference voltage of the system.
By using PWM and the dimming current ratio in this embodiment as shown in fig. 3, the first curve is a PWM signal, the second curve is a light source current signal controlled by PWM, and the third curve is a light source current signal output by the circuit in this embodiment. In a conventional circuit with a period t of the PWM signalPWMWhen the current is 0, the brightness of the light source may not meet the requirement of shooting, if the picture brightness is unstable during high-speed shooting, the picture brightness in the scheme is unstable during the period tPWMThe internal light source current signal is always continuous.
For the coordinated control of the light source trigger and the camera trigger, as shown in fig. 4, a switch circuit 11 is provided at the light source ground. After receiving the user trigger signal, the STM32 applies an edge-preserving filter to filter noise pulses without making the edges of the signal quite fuzzy, outputs a light source trigger signal 6 to switch on the switch circuit 11, switches on the light source to emit light, simultaneously starts the timer 12, and outputs a camera trigger signal 7 after a set period of time. After the scheme is processed in such a way, the light source can reach a stable light-emitting state when the camera is triggered, and a dark space can not appear in a shot picture all the time.
Claims (7)
1. The utility model provides a camera light source coordinated control digital power supply which characterized in that includes the controller: the controller is used for outputting a light source level pulse width modulation signal and a power supply level signal, wherein the power supply level signal is input into the controller through the ADC, and the controller controls the power supply level signal according to the input of the ADC; digital control analog switch: the light source level pulse width modulation signal controls the output of the power supply level signal or the ground level signal at the output end, so that continuous light source level signal output is realized; two-stage RC filter circuit: the input end of the digital control analog switch is connected with the output end of the digital control analog switch, and the output end of the two-stage RC filter circuit is used for outputting continuous light source level signals.
2. The camera light source linkage control digital power supply according to claim 1, comprising a signal follower, wherein the power supply level signal output by the controller is connected to the digital control analog switch through the signal follower.
3. The camera light source coordinated control digital power supply of claim 1, wherein the light source level pulse width modulation signal is connected to the controller as a control feedback signal of the controller output light source level pulse width modulation signal.
4. The digital power supply for linkage control of the camera light source according to claim 1, wherein the output end of the two-stage RC filter circuit is connected with a voltage follower, and the output end of the voltage follower is used for outputting continuous light source level signals.
5. The camera light source linkage control digital power supply according to claim 1, wherein the controller outputs a light source trigger signal, the light source trigger signal is used for switching on and off of a light source switch circuit, the light source trigger signal is used as a camera trigger signal through a timer, and the camera trigger signal is used for triggering the camera to work.
6. The digital power supply of claim 1, wherein the light source level pulse width modulation signal and the power level signal output by the controller are two paths, and the digital control analog switch is CD 4053.
7. The camera light source linkage control digital power supply according to claim 5, wherein the controller controls the light source trigger signal by a user trigger signal, and the user trigger signal is input to the controller through an optical coupler and an inverter.
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| CN106773452B true CN106773452B (en) | 2022-06-14 |
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| CN107750077A (en) * | 2017-11-26 | 2018-03-02 | 四川蓝景光电技术有限责任公司 | LED high-voltage alternating current intelligence control system and its implementation based on Bluetooth technology |
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Effective date of registration: 20230629 Address after: Room 112-113, Floor 1, Building 1, Yard 6, Gaoxin Fourth Street, Huilongguan Town, Changping District, Beijing 102206 Patentee after: Boxing Beijing Polygala Technology Co.,Ltd. Address before: Room 504, building 1, Tongji Science and Technology Plaza, No. 333, Hushan Road, Changshu high tech Industrial Development Zone, Suzhou, Jiangsu 215500 Patentee before: CHANGSHU BOXING OPTOELECTRONIC TECHNOLOGY CO.,LTD. |