CN203015212U - Large-dynamic temperature-compensation type high-precision constant-current source circuit device - Google Patents
Large-dynamic temperature-compensation type high-precision constant-current source circuit device Download PDFInfo
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- CN203015212U CN203015212U CN 201220701491 CN201220701491U CN203015212U CN 203015212 U CN203015212 U CN 203015212U CN 201220701491 CN201220701491 CN 201220701491 CN 201220701491 U CN201220701491 U CN 201220701491U CN 203015212 U CN203015212 U CN 203015212U
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- photoelectric coupler
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Abstract
The utility model relates to a large-dynamic temperature-compensation type high-precision constant-current source circuit device. The large-dynamic temperature-compensation type high-precision constant-current source circuit device is characterized in that the device comprises an adjusting tube (1), a sampling resistor R0 and a feedback circuit (3), the adjusting tube (1) and the sampling resistor R0 are connected in series, the feedback circuit (3) is a photoelectric coupler, both ends of the sampling resistor R0 and an input end of the photoelectric coupler form a loop, an output end of the photoelectric coupler and a thermistor (4) are connected in series, the thermistor (4) is a thermal-sensitive resistor, the series connection connecting point of the thermistor and an output end of the photoelectric coupler is electrically connected with a control end of the adjusting tube (1), the adjusting tube (1) is an npn triode, and a load (2), a sampling resistor R0, and a collector and an emitter of the triode are connected in series at a positive end and a negative end of a second voltage source E2. The circuit has the characteristics of wide voltage range, low cost, good reliability, high precision and the like.
Description
Technical field
The utility model relates to a kind of constant current primary circuit, particularly a kind of large dynamic temp compensation formula high precision constant current primary circuit device.
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.
The utility model content
The purpose of this utility model is to provide that a kind of voltage range is wide, cost is low, good reliability, a kind of large dynamic temp compensation formula high precision constant current primary circuit device that precision is high.
The purpose of this utility model is to realize like this, a kind of large dynamic temp compensation formula high precision constant current primary circuit device, 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, photoelectric coupler output end and thermistor are connected in series, thermistor is thermistor, and thermistor is connected in series a little with photoelectric coupler output end and is electrically connected to the control end of adjusting pipe; Adjusting pipe is the npn triode, and the collector and emitter of load, sample resistance R0, 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 thermistor 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.
The utility model has the advantages that: 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 output of the light of LED will not change with factors vary such as input voltage and temperature.Integrated circuit is simple and reliable.
Description of drawings
The utility model is described in further detail below in conjunction with the embodiment accompanying drawing:
Fig. 1 is the utility model embodiment circuit theory diagrams.
In figure, 1, adjust pipe; 2, load; 3, feedback circuit; 4, thermistor.
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 thermistor 4 are connected in series, and photoelectric coupler output end is connected in series a little with thermistor 4 and is 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 thermistor 4 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.
Rise when adjusting pipe 1 temperature, running parameter changes, and the design basis electric current is increased, and at this moment, thermistor 4 increases (thermistor 4 adopts positive temperature coefficient),
Sample resistance R0 two ends form the loop by current-limiting resistance R2 and photoelectrical coupler input.Sample resistance R0 two ends form the loop by current-limiting resistance R2 and photoelectrical coupler input.
When table 1 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 utility model 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 (3)
1. large dynamic temp compensation formula high precision constant current primary circuit device, it is characterized in that: comprising: 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 thermistor (4) are connected in series, thermistor (4) is thermistor, and thermistor is connected in series a little with photoelectric coupler output end and is electrically connected to the control end of adjusting pipe (1); Adjusting pipe (1) is the npn triode, and the collector and emitter of load (2), sample resistance R0, triode is serially connected in the positive and negative two ends of second voltage source E2 successively.
2. large dynamic temp compensation formula high precision constant current primary circuit device 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.
3. large dynamic temp compensation formula high precision constant current primary circuit device according to claim 1, it is characterized in that: described photoelectric coupler output end and thermistor (4) 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220701491 CN203015212U (en) | 2012-12-18 | 2012-12-18 | Large-dynamic temperature-compensation type high-precision constant-current source circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220701491 CN203015212U (en) | 2012-12-18 | 2012-12-18 | Large-dynamic temperature-compensation type high-precision constant-current source circuit device |
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| Publication Number | Publication Date |
|---|---|
| CN203015212U true CN203015212U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220701491 Expired - Fee Related CN203015212U (en) | 2012-12-18 | 2012-12-18 | Large-dynamic temperature-compensation type high-precision constant-current source circuit device |
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| CN (1) | CN203015212U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108448A (en) * | 2012-12-18 | 2013-05-15 | 刘珉恺 | Large-dynamic temperature-compensation type high-precision constant-current primary circuit |
| CN105527473A (en) * | 2015-09-24 | 2016-04-27 | 北京东方计量测试研究所 | High-stability DC large current source |
-
2012
- 2012-12-18 CN CN 201220701491 patent/CN203015212U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108448A (en) * | 2012-12-18 | 2013-05-15 | 刘珉恺 | Large-dynamic temperature-compensation type high-precision constant-current primary circuit |
| CN105527473A (en) * | 2015-09-24 | 2016-04-27 | 北京东方计量测试研究所 | High-stability DC large current source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20140523 |
|
| 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 |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140523 Address after: 710065 No. four, No. 209, science and Technology Development Zone, Xi'an hi tech Development Zone, Shaanxi Patentee 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 Patentee before: Liu Minkai |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20151218 |
|
| EXPY | Termination of patent right or utility model |