CN103108447A - Large-dynamic high-precision constant-current primary circuit - Google Patents
Large-dynamic high-precision constant-current primary circuit Download PDFInfo
- Publication number
- CN103108447A CN103108447A CN2012105507456A CN201210550745A CN103108447A CN 103108447 A CN103108447 A CN 103108447A CN 2012105507456 A CN2012105507456 A CN 2012105507456A CN 201210550745 A CN201210550745 A CN 201210550745A CN 103108447 A CN103108447 A CN 103108447A
- Authority
- CN
- China
- Prior art keywords
- series
- resistance
- pipe
- sample resistance
- primary circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to a large-dynamic high-precision constant-current primary circuit. The large-dynamic high-precision constant-current primary circuit comprises a regulation tube, a sampling resistor R0 and a feedback circuit, wherein the regulation tube is connected with the sampling resistor R0 in series, the feedback circuit is a photoelectrical coupler, two ends of the sampling resistor R0 and the input end of the photoelectrical coupler form a loop, the output end of the photoelectrical coupler is connected a resistor R1 in series, and the series connection point is in electric connection with the control end of the regulation tube. The large-dynamic high-precision constant-current primary circuit is wide in voltage range, low in cost, good in reliability and high in accuracy.
Description
Technical field
The present invention relates to a kind of constant current primary circuit, particularly a kind of large dynamic high precision constant current primary circuit.
Background technology
The performance parameter of three producers of existing constant-current source circuit free list 1, table 2, table 3 describes: table 1 is
ON company,Table 2 is
Science and technology is built up in Taiwan,Table 3 is
Texas Instruments.
) ON company
| Model | Operating voltage | Operating current | Constant current accuracy | Purposes |
| NSI50350AD | 50 V | 350 mA | ±10% | LED drives |
| NSI50350AS | 50 V | 350 mA | ±10% | LED drives |
| NSI45025Z | 45 V | 25 mA | ±15% | LED drives |
| NSI45030 | 45 V | 30 mA | ±15% | LED drives |
| NSI45025A | 45 V | 25 mA | ±10% | LED drives |
| NSI45025 | 45 V | 25 mA | ±15% | LED drives |
| NSI45020 | 45 V | 20 mA | ±15% | LED drives |
2) science and technology (Mcroblock) is built up in Taiwan
| Model | Operating voltage | Operating current | Constant current accuracy | Purposes |
| MBI5016 | 0-7V | 90 mA | ±10% | LED drives |
| MBI5025? | 3-3.5 V | 3-50 mA | ±6% | LED drives |
| MBI5026 | 5 V | 5-90 mA | ±6% | LED drives |
| MBI5028 | 5 V | 5-90 mA | ±6% | LED drives |
| MBI5030 | 5 V | 8-90mA | ±10% | LED drives |
| MBI5031 | 5.5 V | 5-80 mA | ±10% | LED drives |
| MBI5168 | 5 V | 5-120 mA | ±6% | LED drives |
3) Texas Instruments (TI)
| Model | Operating voltage | Operating current | Constant current accuracy | Purposes |
| LM3492 | 4.5-65V | 200 mA | ±10% | LED drives |
| LM3401 | 4.5-35 V | 1A | ±6% | LED drives |
| LM3444 | 62 V | 130 mA | ±10% | LED drives |
| LM3445 | 80-277 V | 100 mA | ±15% | LED drives |
| LM3448 | 85-265 V | 350 mA | ±10% | LED drives |
| TPS92210 | 85-265 V | 350 mA | ±10% | LED drives |
The product of three above-mentioned producers all exists
The problem that constant current accuracy is low please be spent large voltage in the situation that needs are high, can not reliably use.
Summary of the invention
The purpose of this invention is to provide that a kind of voltage range is wide, cost is low, good reliability, large dynamic high precision constant current primary circuit that precision is high.
The object of the present invention is achieved like this, large dynamic high precision constant current primary circuit, comprise: adjust pipe, sample resistance R0 and feedback circuit, adjusting pipe and sample resistance R0 is connected in series, feedback circuit is photoelectrical coupler, sample resistance R0 two ends and photoelectrical coupler input form the loop, and photoelectric coupler output end and resistance R 1 are connected in series, and are connected in series a little to be electrically connected to the control end of adjusting pipe.During work, load, adjustment pipe and sample resistance R0 are connected in series in the positive and negative two ends of second voltage source E2 successively, photoelectric coupler output end and resistance R 1 are connected in series in the first voltage source E1 positive and negative two ends, at this moment, adjust the pipe conducting, second voltage source E2 is to load, sample resistance R0, the power supply of adjustment pipe, when increasing to sample resistance R0 both end voltage, the load circuit electric current makes, when photoelectric coupler output end voltage control adjustment pipe is equilibrated at a certain electric current, circuit is in stable state, and electric current will be in very little spatial variations.
Described adjustment pipe is N raceway groove mos pipe, and drain electrode and the source electrode of load, sample resistance R0, adjustment pipe are serially connected in the positive and negative two ends of second voltage source E2 successively.
Described adjustment pipe is the npn triode, and the collector and emitter of load, sample resistance R0, npn triode is serially connected in the positive and negative two ends of second voltage source E2 successively.
Described sample resistance R0 two ends form the loop by current-limiting resistance R2 and photoelectrical coupler input.
Described photoelectric coupler output end and resistance R 1 are connected in series, and are connected in series a little to be electrically connected to the control end of adjusting pipe by current-limiting resistance R3.
Advantage of the present invention is: owing to having sealed in sample resistance R0 and adjust pipe in load circuit, voltage on sample resistance R0 is controlled voltage feedback circuit by photoelectrical coupler, the resistance value of readjusting load circuit by voltage feedback circuit makes the current status of load circuit work design, therefore,, the light output of LED will not change with factors vary such as input voltage and temperature.Integrated circuit is simple and reliable.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing:
Fig. 1 is the embodiment of the present invention 1 circuit theory diagrams;
Fig. 2 is the embodiment of the present invention 2 circuit theory diagrams;
Fig. 3 is the embodiment of the present invention 3 circuit theory diagrams.
In figure, 1, adjust pipe; 2, load; 3, feedback circuit.
Embodiment
As shown in Figure 1, comprise: adjust pipe 1, sample resistance R0 and feedback circuit 3, adjusting pipe 1 and sample resistance R0 is connected in series, feedback circuit 3 is photoelectrical coupler, sample resistance R0 two ends and photoelectrical coupler input form the loop, photoelectric coupler output end and resistance R 1 are connected in series, and are connected in series a little to be electrically connected to the control end of adjusting pipe 1.During work, load 2, adjustment pipe 1 and sample resistance R0 are connected in series in the positive and negative two ends of second voltage source E2 successively, photoelectric coupler output end and resistance R 1 are connected in series in the first voltage source E1 positive and negative two ends, at this moment, adjust pipe 1 conducting, second voltage source E2 is to load 2, sample resistance R0,1 power supply of adjustment pipe, when increasing to sample resistance R0 both end voltage, the load circuit electric current makes, when photoelectric coupler output end voltage control adjustment pipe 1 is equilibrated at a certain electric current, circuit is in stable state, and electric current will be in very little spatial variations; Adjusting pipe 1 is N raceway groove mos pipe, and drain electrode and the source electrode of load 2, sample resistance R0, adjustment pipe 1 are serially connected in the positive and negative two ends of second voltage source E2 successively.
As shown in Figure 2, adjusting pipe 1 is the npn triode, and the collector and emitter of load 2, sample resistance R0, npn triode is serially connected in the positive and negative two ends of second voltage source E2 successively; Sample resistance R0 two ends form the loop by current-limiting resistance R2 and photoelectrical coupler input.
As shown in Figure 3, adjusting pipe 1 is the npn triode, and the collector and emitter of load 2, sample resistance R0, npn triode is serially connected in the positive and negative two ends of second voltage source E2 successively; Sample resistance R0 two ends form the loop by current-limiting resistance R2 and photoelectrical coupler input.Photoelectric coupler output end and resistance R 1 are connected in series, and are connected in series a little to be electrically connected to the control end of adjusting pipe 1 by current-limiting resistance R3.
When table 4 provided the fixed voltage load, during the change in voltage of second voltage source, the constant current output result can get from measured data, and the present invention all is stabilized in 20mA ± 1mA. constant current accuracy at the output voltage of 180-240V and reaches ± and 3%.
In fact adjusting pipe 1 can be also pnp triode and p channel MOS tube.
Claims (5)
1. large dynamic high precision constant current primary circuit, it is characterized in that: comprising: adjust pipe, sample resistance R0 and feedback circuit, adjusting pipe and sample resistance R0 is connected in series, feedback circuit is photoelectrical coupler, sample resistance R0 two ends and photoelectrical coupler input form the loop, photoelectric coupler output end and resistance R 1 are connected in series, and are connected in series a little to be electrically connected to the control end of adjusting pipe; During work, load, adjustment pipe and sample resistance R0 are connected in series in the positive and negative two ends of second voltage source E2 successively, photoelectric coupler output end and resistance R 1 are connected in series in the first voltage source E1 positive and negative two ends, at this moment, adjust the pipe conducting, second voltage source E2 is to load, sample resistance R0, the power supply of adjustment pipe, when increasing to sample resistance R0 both end voltage, the load circuit electric current makes, when photoelectric coupler output end voltage control adjustment pipe is equilibrated at a certain electric current, circuit is in stable state, and electric current will be in very little spatial variations.
2. large dynamic high precision constant current primary circuit according to claim 1 is characterized in that: described adjustment pipe is N raceway groove mos pipe, and load, sample resistance R0, drain electrode and the source electrode of adjusting pipe are serially connected in the positive and negative two ends of second voltage source E2 successively.
3. large dynamic high precision constant current primary circuit according to claim 1, it is characterized in that: described adjustment pipe is the npn triode, the collector and emitter of load, sample resistance R0, npn triode is serially connected in the positive and negative two ends of second voltage source E2 successively.
4. large dynamic high precision constant current primary circuit according to claim 1 is characterized in that: described sample resistance R0 two ends are by current-limiting resistance R2 and photoelectrical coupler input formation loop.
5. large dynamic high precision constant current primary circuit according to claim 1, it is characterized in that: described photoelectric coupler output end and resistance R 1 are connected in series, and are connected in series a little to be electrically connected to the control end of adjustment pipe by current-limiting resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105507456A CN103108447A (en) | 2012-12-18 | 2012-12-18 | Large-dynamic high-precision constant-current primary circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105507456A CN103108447A (en) | 2012-12-18 | 2012-12-18 | Large-dynamic high-precision constant-current primary circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103108447A true CN103108447A (en) | 2013-05-15 |
Family
ID=48315926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105507456A Pending CN103108447A (en) | 2012-12-18 | 2012-12-18 | Large-dynamic high-precision constant-current primary circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103108447A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937896U (en) * | 2010-12-08 | 2011-08-17 | 西安福安创意咨询有限责任公司 | 3W LED lamp circuit with current fluctuation control |
| CN201937894U (en) * | 2010-12-08 | 2011-08-17 | 西安福安创意咨询有限责任公司 | Light emitting diode (LED) lamp circuit |
| CN102238784A (en) * | 2011-08-08 | 2011-11-09 | 张晓华 | Light-emitting diode (LED) power supply driving circuit |
-
2012
- 2012-12-18 CN CN2012105507456A patent/CN103108447A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201937896U (en) * | 2010-12-08 | 2011-08-17 | 西安福安创意咨询有限责任公司 | 3W LED lamp circuit with current fluctuation control |
| CN201937894U (en) * | 2010-12-08 | 2011-08-17 | 西安福安创意咨询有限责任公司 | Light emitting diode (LED) lamp circuit |
| CN102238784A (en) * | 2011-08-08 | 2011-11-09 | 张晓华 | Light-emitting diode (LED) power supply driving circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203552115U (en) | Output circuit of program-control current source | |
| CN204631666U (en) | The current source of zero-temperature coefficient | |
| CN103424580A (en) | Electronic load | |
| CN104080225A (en) | Constant current source circuit and illumination device | |
| CN203015212U (en) | Large-dynamic temperature-compensation type high-precision constant-current source circuit device | |
| CN102364569B (en) | A kind of linear constant current Drive and Control Circuit and light-emitting diode display thereof | |
| CN203870501U (en) | Temperature-independent integrated circuit current reference | |
| CN203015213U (en) | Large-dynamic high-precision constant-current source circuit device | |
| CN103049033B (en) | Constant current source circuit and sampling circuit | |
| CN103108447A (en) | Large-dynamic high-precision constant-current primary circuit | |
| CN104104057A (en) | Power supply protection circuit | |
| CN104009503A (en) | Charging circuit and control circuit and control method | |
| CN202475387U (en) | Power-on reset POR circuit with variable reset voltage point, based on band gap reference source | |
| CN103108448A (en) | Large-dynamic temperature-compensation type high-precision constant-current primary circuit | |
| CN204559983U (en) | A kind of LED drive chip | |
| CN104656724A (en) | Electronic device | |
| CN204425314U (en) | A kind of opto-coupled feedback isolator | |
| CN204741605U (en) | Elevator LED lamp plate constant current control circuit | |
| CN202268150U (en) | Digital voltage-regulating circuit and display device with same | |
| CN201780313U (en) | Adjustable resistor type testing device | |
| CN206759413U (en) | Current mode analog input interface circuit | |
| CN204302846U (en) | Tandem type constant current adjustable voltage-stabilized source | |
| CN206759414U (en) | Single-ended analog input interface circuit | |
| CN203661017U (en) | Comparator realization circuit | |
| CN204425716U (en) | Light adjusting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: LEIYI PHOTOELECTRIC TECHNOLOGY (XI'AN) CO., LTD. Free format text: FORMER OWNER: LIU MINKAI Effective date: 20140612 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 710300 XI'AN, SHAANXI PROVINCE TO: 710065 XI'AN, SHAANXI PROVINCE |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20140612 Address after: 710065 No. four, No. 209, science and Technology Development Zone, Xi'an hi tech Development Zone, Shaanxi Applicant after: Lei Yi photoelectric technology (Xi'an) Co., Ltd. Address before: Huxian Station Road 710300 Shaanxi city of Xi'an province No. 68 Spring Hotel Applicant before: Liu Minkai |
|
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130515 |
|
| RJ01 | Rejection of invention patent application after publication |