CN109660143A - A kind of law-enforcing recorder multiple power source conversion circuit - Google Patents
A kind of law-enforcing recorder multiple power source conversion circuit Download PDFInfo
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- CN109660143A CN109660143A CN201910119636.0A CN201910119636A CN109660143A CN 109660143 A CN109660143 A CN 109660143A CN 201910119636 A CN201910119636 A CN 201910119636A CN 109660143 A CN109660143 A CN 109660143A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of law-enforcing recorder multiple power source conversion circuits, it is characterized in that: including signal amplification circuit, signal amplification circuit includes the signal input part 1N, first stage amplifier UB, two pole amplifier UA of analog signal, is connected with adjustable resistance circuit on the anode of the first stage amplifier UB；The output end of the two pole amplifier UA connects the linear optical coupling device for light current and device for power switching to be isolated；Analog signal through being isolated is connected with 2 road PWM waveform conversion circuits; PWM square-wave signal is converted analog signals by A/D converter circuit; and realize the programmable output of pulse frequency control; and it is connected with 4 road PWM waveform transfer zone dead zone protecting circuits; it controls 4 device for power switching to work, switch amplification is carried out to the voltage waveform of -2~+2V of most original；Finally by current rectifying and wave filtering circuit, the voltage of the frequency needed, so that the charging voltage frequency amplitude of output is adjustable, applicability is wider, voltage more good stable.
Description
Technical field
The present invention relates to law-enforcing recorder fields, more particularly to a kind of law-enforcing recorder multiple power source conversion circuit.
Background technique
Currently, law enfrocement official exercises a public function when needing to record field condition, usually using camera shooting or camera installation
Enforcing law is recorded, law-enforcing recorder can be convenient for dynamic, static field condition digitized record is carried out in enforcing law
Public security cadres and police enforce the law use in various environment.Law-enforcing recorder, which passes through, provides effective field image data, commanded for case,
Detection and procuratorial organ's evidence obtaining.It has small in size, the functions such as easy to carry, is very useful novel law enforcement equipment.
Existing law-enforcing recorder, can not be into for collected data typically only only with the function of storing data
Row is timely handled, and can be handled data upload after needing to take back, law-enforcing recorder is usually and acquisition workstation
It is used cooperatively.The electronic evidence shot with video-corder in law-enforcing recorder, after connecting with acquisition workstation, downloading uploads to acquisition workstation
In, but when law-enforcing recorder is transmitted, USB flash disk mode will be entered, charging voltage at this time is not sufficiently stable, or up to not
To regulation charging voltage, causes charging slower, or cause chronic injury to internal battery, reduce the preparation of law-enforcing recorder
Time.
The Chinese patent of Publication No. CN103777147A discloses detection law-enforcing recorder in a kind of acquisition workstation and fills
The method and device of power consumption.Acquisition workstation carries out data downloading, upload and charging, acquisition to the law-enforcing recorder of connection
The model of law-enforcing recorder, each charge mode, charging duration, the correspondence of charge rate of each charging stage are stored in work station
Relationship.But it is not powered the setting of voltage and frequency to the power supply unit of law-enforcing recorder, still there is the above problem；It is public
A kind of anury law-enforcing recorder and system, law-enforcing recorder acquisition workstation and acquisition system that the number of opening is CN205726038U,
The anury law-enforcing recorder includes processing module, ultra wide band (UWB) transmitting module and wireless charging receiving module, the processing
Module is separately connected the ultra wide band transmitting module and the wireless charging receiving module, the ultra wide band transmitting module be used for
Law enforcement record data are wirelessly transmitted to law-enforcing recorder acquisition workstation by ultra wide band near-field communication modes, and the wireless charging connects
Module is received for receiving the wireless signal transmitted from law-enforcing recorder acquisition workstation, and is converted into electric energy and is filled with realizing
Electricity.But the electric energy conversion that wireless charging compares solar recharging has more unstability, if encounter the barriers such as electromagnetism barrier, more
In the presence of charging blind area.
For the law-enforcing recorder of plurality of specifications on the market, some special law-enforcing recorder equipment need the friendship of higher frequency
Galvanic electricity presses or needs the voltage of power supply adjustable at any time with the operating status of equipment, and at this moment, common power-supply device becomes very
Difficulty meets its requirement.Frequency converter can provide the alternating voltage of changeable frequency at present, but it can only provide to its alternating current generator and move
Power, and adjustable dc voltage can not be exported.Therefore, it in addition to conventional USB flash drive power supply mode, more needs one kind that there is adjustability, more extensively fit
With property, the law-enforcing recorder multiple power source conversion circuit conversion circuit of more good stable voltage, can for power in a certain range,
There is the law-enforcing recorder equipment of particular/special requirement to provide power supply frequency and voltage.
Summary of the invention
The object of the present invention is to provide a kind of law-enforcing recorder multiple power source conversion circuit, have frequency amplitude adjustability,
The voltage endurance advantage of wider applicability, more good stable.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of general electricity of law-enforcing recorder
Source conversion circuit, including signal amplification circuit, the signal amplification circuit include that the signal input part 1N of analog signal, level-one are put
Big device UB, two pole amplifier UA, the signal input part 1N are connected with the cathode of first stage amplifier UB, the first stage amplifier UB
Output end be connected with the anode of two pole amplifier UA, be connected with adjustable resistance circuit on the anode of the first stage amplifier UB；
The adjustable resistance circuit includes the sliding variable resistance R8 connecting with first stage amplifier UB anode, and the two of the sliding variable resistance R8
End is connected separately with ground resistance R10, meets level resistance R9；
The output end of the two pole amplifier UA connects the linear optical coupling device for light current and device for power switching to be isolated；
Analog signal by isolation is connected with 2 road PWM waveform conversion circuits, and the 2 road PWM waveform conversion circuit includes 20 pipes
Pin chip U1,20 pipe pin chip U1 convert analog signals into PWM square-wave signal by A/D converter circuit, and realize pulse
Single analog signal is changed into 2 road PWM waveforms by setting register by the programmable output of frequency control；
The 2 road PWM waveform conversion circuit is connected with 4 road PWM waveform transfer zone dead zone protecting circuits, 4 road PWM waveform transfer zones
Dead zone protecting circuit includes two group of 16 pin chip U4B, chip U5B, controls 4 device for power switching and works, to most former
The voltage waveform of -2~+2V to begin carries out switch amplification；
The 4 road PWM waveform transfer zone dead zone protecting circuit is connected with current rectifying and wave filtering circuit, and the current rectifying and wave filtering circuit includes two
Resistance R38, the resistance R39, the resistance R38, resistance R39 that group is connect with output end respectively are in series with resistance R40, resistance respectively
R41 is parallel with ground resistance R13, ground resistance R14, the resistance respectively between the output end and resistance R38, resistance R39
Ground capacity C7, ground capacity C8, the resistance R40, electricity are parallel between R38, resistance R39 and resistance R40, resistance R41 respectively
As final output end is connected separately with after inductance L1, inductance L2, the inductance L1, inductance L2 after resistance R41.
Preferably, the resistance value of the sliding variable resistance R8 of the adjustable resistance circuit is 1k Ω, the resistance R9, resistance R10
Resistance value be respectively 30k Ω, 10k Ω.
Preferably, the resistance value of the resistance R38, resistance R39, resistance R40, resistance R41 are all 250K Ω, the ground connection
Resistance R13, ground resistance R14 resistance value be all 1.5k Ω, the ground capacity C7, ground capacity C8 capacitance be all
1000pF, the inductance L1, inductance L2 sensibility reciprocal be all 0.06MH.
Preferably, 4 device for power switching are respectively triode Q1B, triode Q2B, triode Q3B, three-level
The base stage of pipe Q4B, the triode Q1B and triode Q2B are connect with the pin 8 of 16 pin chip U4B with pin 1 respectively, institute
The base stage for stating triode Q3B and triode Q4B is connect with the pin 8 of 16 pin chip U5B with pin 1 respectively, the triode
Q2B is connect with triode Q4B common emitter.
Preferably, the base stage of the triode Q1B, triode Q2B, triode Q3B, triode Q4B are in series with respectively
Protective resistance R26, protective resistance R27, protective resistance R28, protective resistance R29, the protective resistance R26, protective resistance R27,
Protective resistance R28, protective resistance R29 resistance value be all 15 Ω.
To sum up, the invention has the following advantages:
1, waveform amplifying circuit waveform amplifier section of the invention distortion will not be too serious, if distortion seriously affects the wave of output
Shape also will be unable to perfectly restore original waveform frequency and amplitude dynamic changing process；
2, analog signal turns pwm signal circuit, and 2 road PWM waveforms are converted into 4 power switch devices of four road PWM waveforms and control
Part works and is not in short circuit phenomenon；
3,2 road PWM are turned into 4 roads band dead zone protection pwm circuit, there is more stable output frequency and amplitude；
4, it by the combination of above-mentioned three groups of circuits, realizes the adjustable variable output voltage of stable frequency amplitude, can be less than for power
450W has the equipment of particular/special requirement to provide power, frequency-tuning range 0-2kHz, voltage magnitude supply frequency and voltage
Adjustable range is 0-220V.
Detailed description of the invention
Fig. 1 is the schematic diagram that the present embodiment is used to embody signal amplification circuit；
Fig. 2 is the schematic diagram of linear optical coupler isolation light current and power device in the present embodiment；
Fig. 3 is the schematic diagram that analog signal is converted into 2 road PWM waveforms in the present embodiment；
Fig. 4 is the schematic diagram of 4 road PWM waveform transfer zone dead zone protecting circuits in the present embodiment；
Fig. 5 is the schematic diagram of current rectifying and wave filtering circuit in the present embodiment.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, right combined with specific embodiments below
A specific embodiment of the invention is described in detail.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by the specific embodiments disclosed below.
Secondly, " one embodiment " or " embodiment " referred to herein, which refers to, may be included at least one realization side of the invention
A particular feature, structure, or characteristic in formula." in one embodiment " that different places occur in the present specification not refers both to
The same embodiment, nor the individual or selective embodiment mutually exclusive with other embodiments.
Embodiment: as shown in Figure 1, a kind of law-enforcing recorder multiple power source conversion circuit comprising signal amplification circuit, letter
Number amplifying circuit includes the signal input part 1N, first stage amplifier UB, two pole amplifier UA of analog signal, signal input part 1N with
The cathode of first stage amplifier UB is connected, and the output end of first stage amplifier UB is connected with the anode of two pole amplifier UA.Can will -2~+
The voltage of 2V is amplified its signal by operational amplifier.When
As shown in Figure 1, being connected with adjustable resistance circuit on the anode of first stage amplifier UB.Adjustable resistance circuit includes putting with level-one
The sliding variable resistance R8 of big device UB anode connection, the both ends of sliding variable resistance R8 are connected separately with ground resistance R10, connect level resistance
The resistance value of R9, the sliding variable resistance R8 of adjustable resistance circuit be 1k Ω, resistance R9, resistance R10 resistance value be respectively 30k Ω, 10k
Ω。
As shown in Fig. 2, in order to enable design power-supply device have higher reliability, need light current and power switch device
Part is isolated, so linear optical coupling device is selected to be isolated, the output end of two pole amplifier UA is connected for light current to be isolated
With the linear optical coupling device of device for power switching.It can inhibit the influence that circuit is brought by the variation of external condition, such as temperature noise
Deng.
As shown in figure 3, the analog signal by isolation is connected with 2 road PWM waveform conversion circuits, 2 road PWM waveforms conversion electricity
Road includes that 20 pipe pin chip U1,20 pipe pin chip U1 convert analog signals into PWM square-wave signal by A/D converter circuit,
And realize the programmable output of pulse frequency control, single analog signal is changed by 2 road PWM waveforms by setting register.First
It sets a TOP value and resets a fiducial value, then, counter starts counting, and keeps output 1, count down to the comparison of setting
When value, level becomes 0, and maintains, and then proceedes to count down to TOP, level becomes 1 again, such repetitive cycling.T/C1 can produce
2 tunnels (OC1A, that is, PB1 OC1B, that is, PB2), T/C2 are generated all the way (OC2, that is, PB3), and there are four the registers for needing to set T/C1
TCCR1A TCCR1B (the two registers determine the producing method of two-way pwm signal, frequency and TOP value together) OCR1A
(this value/TOP is exactly duty ratio) OCR1B (duty ratio of the second road PWM of setting), it is described above to generate several fixed frequencies
The pwm signal (duty ratio can be adjusted at will) of rate, and the frequency of preceding two-way be it is the same, want frequency to generate oneself
PWM needs to be set the TOP value of OCR1B with OCR1A, generates PWM by OCR1B.
As shown in figure 3,2 road PWM waveform conversion circuits are connected with 4 road PWM waveform transfer zone dead zone protecting circuits, 4 road PWM
Waveform transfer zone dead zone protecting circuit includes two group of 16 pin chip U4B, chip U5B, controls 4 device for power switching and carries out work
Make, switch amplification is carried out to the voltage waveform of -2~+2V of most original；4 device for power switching are respectively triode Q1B, three
The base stage of grade pipe Q2B, triode Q3B, triode Q4B, triode Q1B and triode the Q2B pipe with 16 pin chip U4B respectively
Foot 8 is connect with pin 1, and the base stage of triode Q3B and triode Q4B connect with the pin 8 of 16 pin chip U5B and pin 1 respectively
It connects, triode Q2B is connect with triode Q4B common emitter.The base of triode Q1B, triode Q2B, triode Q3B, triode Q4B
Pole is in series with protective resistance R26, protective resistance R27, protective resistance R28, protective resistance R29, protective resistance R26, protection respectively
Resistance R27, protective resistance R28, protective resistance R29 resistance value be all 15 Ω.The resistance of base stage concatenation is protected for protecting base stage
Protect CPU.Four triode base stages and emitter need series resistor, and the effect of the resistance is to make crystal when input is in high-impedance state
The reliable cut-off of pipe, minimum are to can satisfy transistor with after base stage current-limiting resistance partial pressure when prime driving is saturated transistor
Critical saturation, when actual selection can be much higher than this minimum, the resistance value that usually external interference is smaller, load is permitted more again
It is bigger, using 10K magnitude.
As shown in figure 4, the waveform finally output it carries out the voltage that rectifying and wave-filtering becomes the frequency that can be needed.4 tunnels
PWM waveform transfer zone dead zone protecting circuit is connected with current rectifying and wave filtering circuit, current rectifying and wave filtering circuit include two groups respectively with output end
Resistance R38, the resistance R39 of connection, resistance R38, resistance R39 are in series with resistance R40, resistance R41, output end and resistance respectively
Ground resistance R13, ground resistance R14, resistance R38, resistance R39 and resistance R40, resistance are parallel between R38, resistance R39 respectively
Inductance L1, electricity are connected separately with after being parallel with ground capacity C7, ground capacity C8, the resistance R40, resistance R41 between R41 respectively
Feel L2, is final output end after inductance L1, inductance L2.Resistance R38, resistance R39, resistance R40, resistance R41 resistance value be all
250K Ω, ground resistance R13, ground resistance R14 resistance value be all 1.5k Ω, ground capacity C7, ground capacity C8 capacitance all
For 1000pF, inductance L1, inductance L2 sensibility reciprocal be all 0.06MH.Voltage to the frequency needed, different size and type
Number law-enforcing recorder needs the electricity of the passband rate in input -2+2 range according to the normal voltage and power recorded on its shell
Corrugating.+ the 220V of output can be corresponded to by-the 220V of the corresponding output of the circuit -2V ,+2V, median input can be obtained
Intermediate free voltage, to have the advantages that frequency amplitude adjustability, wider applicability, more good stable are voltage endurance.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present invention after reading this specification, but as long as in this hair
All by the protection of Patent Law in bright scope of the claims.
Claims (5)
1. a kind of law-enforcing recorder multiple power source conversion circuit, it is characterised in that: including signal amplification circuit, the signal amplification
Circuit includes the signal input part 1N, first stage amplifier UB, two pole amplifier UA of analog signal, the signal input part 1N and one
The cathode of grade amplifier UB is connected, and the output end of the first stage amplifier UB is connected with the anode of two pole amplifier UA, and described one
Adjustable resistance circuit is connected on the anode of grade amplifier UB；
The adjustable resistance circuit includes the sliding variable resistance R8 connecting with first stage amplifier UB anode, and the two of the sliding variable resistance R8
End is connected separately with ground resistance R10, meets level resistance R9；
The output end of the two pole amplifier UA connects the linear optical coupling device for light current and device for power switching to be isolated；
Analog signal by isolation is connected with 2 road PWM waveform conversion circuits, and the 2 road PWM waveform conversion circuit includes 20 pipes
Pin chip U1,20 pipe pin chip U1 convert analog signals into PWM square-wave signal by A/D converter circuit, and realize pulse
Single analog signal is changed into 2 road PWM waveforms by setting register by the programmable output of frequency control；
The 2 road PWM waveform conversion circuit is connected with 4 road PWM waveform transfer zone dead zone protecting circuits, 4 road PWM waveform transfer zones
Dead zone protecting circuit includes two group of 16 pin chip U4B, chip U5B, controls 4 device for power switching and works, to most former
The voltage waveform of -2~+2V to begin carries out switch amplification；
The 4 road PWM waveform transfer zone dead zone protecting circuit is connected with current rectifying and wave filtering circuit, and the current rectifying and wave filtering circuit includes two
Resistance R38, the resistance R39, the resistance R38, resistance R39 that group is connect with output end respectively are in series with resistance R40, resistance respectively
R41 is parallel with ground resistance R13, ground resistance R14, the resistance respectively between the output end and resistance R38, resistance R39
Ground capacity C7, ground capacity C8, the resistance R40, electricity are parallel between R38, resistance R39 and resistance R40, resistance R41 respectively
As final output end is connected separately with after inductance L1, inductance L2, the inductance L1, inductance L2 after resistance R41.
2. a kind of law-enforcing recorder multiple power source conversion circuit according to claim 1, it is characterised in that: the adjustable electric
The resistance value of the sliding variable resistance R8 of resistance circuit be 1k Ω, the resistance R9, resistance R10 resistance value be respectively 30k Ω, 10k Ω.
3. a kind of law-enforcing recorder multiple power source conversion circuit according to claim 2, it is characterised in that: the resistance
R38, resistance R39, resistance R40, resistance R41 resistance value be all 250K Ω, the resistance value of the ground resistance R13, ground resistance R14
Be all 1.5k Ω, the ground capacity C7, ground capacity C8 capacitance be all 1000pF, the sensibility reciprocal of the inductance L1, inductance L2
It is all 0.06MH.
4. a kind of law-enforcing recorder multiple power source conversion circuit according to claim 1, it is characterised in that: 4 function
Rate switching device is respectively triode Q1B, triode Q2B, triode Q3B, triode Q4B, the triode Q1B and triode
The base stage of Q2B is connect with the pin 8 of 16 pin chip U4B with pin 1 respectively, the base stage of the triode Q3B and triode Q4B
It is connect respectively with the pin 8 of 16 pin chip U5B with pin 1, the triode Q2B is connect with triode Q4B common emitter.
5. a kind of law-enforcing recorder multiple power source conversion circuit according to claim 4, it is characterised in that: the triode
Q1B, triode Q2B, triode Q3B, triode Q4B base stage be in series with respectively protective resistance R26, protective resistance R27, protection
Resistance R28, protective resistance R29, the resistance value of the protective resistance R26, protective resistance R27, protective resistance R28, protective resistance R29
It is all 15 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910119636.0A CN109660143A (en) | 2019-02-18 | 2019-02-18 | A kind of law-enforcing recorder multiple power source conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910119636.0A CN109660143A (en) | 2019-02-18 | 2019-02-18 | A kind of law-enforcing recorder multiple power source conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109660143A true CN109660143A (en) | 2019-04-19 |
Family
ID=66122808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910119636.0A Pending CN109660143A (en) | 2019-02-18 | 2019-02-18 | A kind of law-enforcing recorder multiple power source conversion circuit |
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| Country | Link |
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| CN (1) | CN109660143A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201828264U (en) * | 2010-07-12 | 2011-05-11 | 苏州亿帝电子科技有限公司 | Continuous laser detector |
| CN103167691A (en) * | 2013-03-04 | 2013-06-19 | 江南大学 | Light emitting diode (LED) driving power supply and dimming system |
| CN109525104A (en) * | 2018-10-09 | 2019-03-26 | 三英精控（天津）仪器设备有限公司 | The adjustable AC/DC universal power supply of frequency amplitude |
-
2019
- 2019-02-18 CN CN201910119636.0A patent/CN109660143A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201828264U (en) * | 2010-07-12 | 2011-05-11 | 苏州亿帝电子科技有限公司 | Continuous laser detector |
| CN103167691A (en) * | 2013-03-04 | 2013-06-19 | 江南大学 | Light emitting diode (LED) driving power supply and dimming system |
| CN109525104A (en) * | 2018-10-09 | 2019-03-26 | 三英精控（天津）仪器设备有限公司 | The adjustable AC/DC universal power supply of frequency amplitude |
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