CN204517789U - Two-forty optocoupler integrated chip - Google Patents
Two-forty optocoupler integrated chip Download PDFInfo
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- CN204517789U CN204517789U CN201520349013.XU CN201520349013U CN204517789U CN 204517789 U CN204517789 U CN 204517789U CN 201520349013 U CN201520349013 U CN 201520349013U CN 204517789 U CN204517789 U CN 204517789U
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Abstract
The utility model discloses a kind of two-forty optocoupler integrated chip, optocoupler comprises light radiating portion, light receiving part and signal amplifying part and divides, and the light receiving part of described optocoupler and signal amplifying part are divided increases transistor seconds T2 and diode D; The collector electrode of described transistor seconds T2 is connected with the positive pole of photodiode PD and the base stage of the first transistor T1 respectively, the grounded emitter of transistor seconds T2, and the base stage of transistor seconds T2 connects the emitter of the first transistor T1; The positive pole of described diode D connects the first transistor T1 emitter, the minus earth of diode D.The utility model by increasing transistor seconds T2 and diode D in the output photosensor chip of optocoupler, the first transistor can be made to hightail degree of depth saturation condition, accelerate the junction capacitance electric discharge of the first transistor, when output load resistance is constant, substantially increase the output speed of optocoupler.
Description
Technical field
The utility model relates to technical field of electronic components, particularly a kind of for two-forty optocoupler integrated chip.
Background technology
Optocoupler is the abbreviation of optical coupler, photoisolator, is take light as the media transmission signal of telecommunication, has good buffer action to input electrical signal and the output signal of telecommunication, antijamming capability is strong, and working stability is contactless, long service life, efficiency of transmission is high, is therefore used widely in circuit.Optocoupler is generally made up of three parts: the amplification of the transmitting of light, the reception of light and signal, and input electrical signal drives light-emitting diode, makes it the light sending certain wavelength, is received and produce photoelectric current by photo-detector, then exports after amplifying further.
As shown in Figure 1, EM is input chip to the electrical principle of normal transistor optocoupler, i.e. light radiating portion, and photodiode PD and transistor T1 forms output photosensor chip, and wherein photodiode PD is light receiving part, and transistor T1 is that signal amplifying part is divided, R
lfor output load resistance, Standard resistance range is 100 ~ 5.1k Ω.In the normal transistor optocoupler course of work, because the junction capacitance at the be two ends of transistor T1 amplifies the electric capacity making the generation of the ce of T1 end be greater than be terminal number hundred times by transistor T1, thus be namely in degree of depth saturation condition after making transistor T1 conducting, and the deadline of transistor T1 not only depends on load resistance R
l, also depend on that ce holds the velocity of discharge of electric capacity, therefore as load resistance R
lnecessarily, transistor T1 is when being in degree of depth saturation condition, and ce holds the velocity of discharge of electric capacity then very slow, and the switching speed also just causing transistor T1 is lower.
Summary of the invention
The utility model technical issues that need to address be to provide a kind of when load resistance is constant, improve the optocoupler integrated chip of output speed.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
Two-forty optocoupler integrated chip, optocoupler comprises light radiating portion, light receiving part and signal amplifying part and divides, and the light receiving part of described optocoupler and signal amplifying part are divided increases transistor seconds T2 and diode D; The collector electrode of described transistor seconds T2 is connected with the positive pole of photodiode PD and the base stage of the first transistor T1 respectively, the grounded emitter of transistor seconds T2, and the base stage of transistor seconds T2 connects the emitter of the first transistor T1; The positive pole of described diode D connects the first transistor T1 emitter, the minus earth of diode D.
Owing to have employed above technical scheme, acquired by the utility model, technological progress is as follows.
The utility model by increasing transistor seconds T2 and diode D in the output photosensor chip of optocoupler, the first transistor can be made to hightail degree of depth saturation condition, accelerate the junction capacitance electric discharge of the first transistor, the be reducing the first transistor holds junction capacitance effect, when output load resistance is constant, substantially increase the output speed of optocoupler.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of common optical coupler;
Fig. 2 is circuit diagram of the present utility model.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the utility model is described in detail.It should be noted that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Normal transistor optocoupler comprises light radiating portion, light receiving part and signal amplifying part and divides, and light radiating portion is input chip, and light receiving part and signal amplifying part are divided into output photosensor chip.Output photosensor chip comprises photodiode PD, the first transistor T1 and output load resistance R
l, wherein the positive pole of photodiode PD is connected with the base stage of the first transistor T1, and the negative pole of photodiode PD connects the collector electrode of the first transistor T1, the grounded emitter of the first transistor T1; The collector electrode of the first transistor T1 is also through output load resistance R
lconnect power supply.
In the utility model, be the output speed improving normal transistor optocoupler, divide at the light receiving part of optocoupler and signal amplifying part and set up transistor seconds T2 and diode D, as shown in Figure 2.Wherein the collector electrode of transistor seconds T2 is connected with the positive pole of photodiode PD and the base stage of the first transistor T1 respectively, the grounded emitter of transistor seconds T2, forms diverter branch; The base stage of transistor seconds T2 connects the emitter of the first transistor T1, forms discharge paths; The positive pole of diode D connects the first transistor T1 emitter, the minus earth of diode D, forms pressure limiting branch road.
The present embodiment in the course of the work, when the light radiating portion of general optocoupler is luminous, the light-dependent current of photodiode PD photosensitive generation 10 ~ 30 μ A, the light-dependent current of photodiode PD is while triggering the first transistor T1 base stage makes the first transistor T1 conducting, and transistor seconds T2 also has the electric current I of 5 ~ 20 μ A
c2 flow through.Owing to acting on while the first transistor T1 and diode D, the first transistor T1 can be made to depart from degree of depth saturation condition, and making the be of the first transistor T1 hold junction capacitance electric current by the ce end electric discharge of transistor seconds T2, the be reducing the first transistor T1 holds junction capacitance effect, accelerates output speed.
In the present embodiment, as output load resistance R
lduring value 1.9 k Ω, the operating frequency of optocoupler can reach 100kHz, is much higher than the output speed using the former common optical coupler of the utility model method.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, diverter branch, pressure limiting branch road and discharge paths can also be the circuit structures that other components and parts are formed.Therefore all do within principle of the present utility model and spirit any amendment, equivalent to replace and improvement etc., be all just included within protection range of the present utility model.
Claims (1)
1. two-forty optocoupler integrated chip, described optocoupler comprises light radiating portion, light receiving part and signal amplifying part and divides, and it is characterized in that, the light receiving part of described optocoupler and signal amplifying part are divided increases transistor seconds T2 and diode D; The collector electrode of described transistor seconds T2 is connected with the positive pole of photodiode PD and the base stage of the first transistor T1 respectively, the grounded emitter of transistor seconds T2, and the base stage of transistor seconds T2 connects the emitter of the first transistor T1; The positive pole of described diode D connects the first transistor T1 emitter, the minus earth of diode D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520349013.XU CN204517789U (en) | 2015-05-27 | 2015-05-27 | Two-forty optocoupler integrated chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520349013.XU CN204517789U (en) | 2015-05-27 | 2015-05-27 | Two-forty optocoupler integrated chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204517789U true CN204517789U (en) | 2015-07-29 |
Family
ID=53715717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520349013.XU Active CN204517789U (en) | 2015-05-27 | 2015-05-27 | Two-forty optocoupler integrated chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204517789U (en) |
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2015
- 2015-05-27 CN CN201520349013.XU patent/CN204517789U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: WUXI GIAN MENDA TECHNOLOGY Co.,Ltd. Assignor: Shen Zhenqiang Contract record no.: 2015320010154 Denomination of utility model: High speed opto-coupler NULL Granted publication date: 20150729 License type: Common License Record date: 20151104 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201124 Address after: 315000 factory buildings 23 and 24, No. 68, Yuhai East Road, Hangzhou Bay New District, Ningbo City, Zhejiang Province Patentee after: Ningbo qunzi Microelectronics Co.,Ltd. Address before: 214145, Wuxi strong dream Technology Co., Ltd., 208-9 Tin Road, Hongshan Town, Hongshan District, Wuxi, Jiangsu Patentee before: Shen Zhenqiang |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 315336 plant 23 and 24, No. 68, Yuhai East Road, Hangzhou Bay New Area, Ningbo City, Zhejiang Province Patentee after: Ningbo Qunxin Microelectronics Co.,Ltd. Address before: 315000 workshops 23 and 24, 68 Yuhai East Road, Hangzhou Bay New District, Ningbo City, Zhejiang Province Patentee before: Ningbo qunzi Microelectronics Co.,Ltd. |