CN2534736Y - Low light switch - Google Patents
Low light switch Download PDFInfo
- Publication number
- CN2534736Y CN2534736Y CN 02224444 CN02224444U CN2534736Y CN 2534736 Y CN2534736 Y CN 2534736Y CN 02224444 CN02224444 CN 02224444 CN 02224444 U CN02224444 U CN 02224444U CN 2534736 Y CN2534736 Y CN 2534736Y
- Authority
- CN
- China
- Prior art keywords
- resistance
- logic
- switch
- photocell
- utility
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model relates to a weak light switch, which uses the light as the condition for the switch connection and disconnection. The utility model aims to provide a new proposal to overcome the shortcoming that a prior technical structure is complicated, the cost is high and the power consumption is too large. The technical solution comprises a photocell pile, the negative end of which is grounded and the positive end of which is connected with a logic switch. The logic switch comprises an audion and three resistors. The photocell pile is connected with the base electrode of the audion. The collector of the audion is grounded via a resistor, and the emitter is connected with the joint of two resistors forming a voltage division circuit. The resistors are grounded and connected with a reference voltage. The logic switch is a logic gate. The photocell pile is connected with the logic input end of the logic switch. Working of the utility model is realized by using the voltage output characteristic of the solar cell plate in the case of weak light.
Description
Affiliated technical field:
The utility model relates to and utilizes a kind of Low light switch of light as the switch on and off condition.
Background technology:
The utilization of solar energy is universal day by day, but because of its efficient is low, therefore in use is restricted.This reason wherein, one is that the conversion efficiency of solar cell itself is low, Another reason is exactly the circuit part in the common solar energy application system, in case insert just in running order all the time, power consumption is excessive, present under the situation that the conversion efficiency of solar photocell does not also increase substantially, the circuit power consumption that reduces solar energy system is a kind of mode preferably.And the circuit of solar energy system also exists complex structure, the shortcoming that cost is higher.
Summary of the invention:
The purpose of this utility model is that a kind of Low light switch will be provided, to overcome prior art complex structure, cost height, the excessive shortcoming of power consumption.
For achieving the above object, technical solution of the present utility model is: a kind of Low light switch, comprise photocell group E, and its special character is: the negative pole end ground connection of described photocell group E, its positive terminal is connected with logic switch.
Above-mentioned logic switch comprises triode T, resistance R
1, resistance R
2And resistance R
3, the positive terminal of described photocell group E is connected to the base stage of triode T, and the collector electrode of described triode T is through resistance R
3Ground connection, its emitter is connected to resistance R
1Resistance R with ground connection
2Node, described resistance R
1Be connected on the reference voltage.
Above-mentioned logic switch is a gate, and the positive terminal of described photocell group E is connected with its logic input terminal.
Be connected to earth resistance R between above-mentioned photocell group E and the gate logic input terminal
4
Operation principle of the present utility model is to utilize the voltage output characteristics of solar panel under low light condition to realize.When ambient light weakened, the output voltage of solar photocell reduced, when photronic output voltage can satisfy input that the logic switch state changes and requires, and the similar state input of photocell of this moment, starting to control what make usefulness is the intensity of ambient light.Therefore compared with prior art, the utility model has the advantages that circuit structure is simple, cost is low, low in energy consumption and serviceability good.
Description of drawings:
Fig. 1 is the circuit theory diagrams of an embodiment of the present utility model;
Fig. 2 is the circuit theory diagrams of another embodiment of the present utility model.
Embodiment:
The utility model is described in further detail below in conjunction with drawings and Examples:
Referring to Fig. 1, the utility model comprises a positive-negative-positive triode T, resistance R
1, resistance R
2, resistance R
3And photocell group E, wherein resistance R
1And resistance R
2Constitute bleeder circuit.The negative pole end ground connection of said photocell group E, the positive terminal of photocell group E is connected to the base stage of triode T, and the collector electrode of described triode T is through resistance R
3Ground connection, its emitter is connected to the resistance R of ground connection
2And resistance R
1Node, said resistance R
1Be connected on the reference voltage V cc.
Output in the circuit connects with actual needs, and the value of Ve is by resistance R
1And resistance R
2Constitute bleeder circuit determined.When solar irradiation was mapped on the solar battery group E, photocell group E output photovoltaic voltage was Vb, when sunlight normally shines on the solar battery group, the value of Vb is much larger than the conducting voltage of triode T, this moment, triode T ended, and Vc is zero, is logic low; When ambient light intensity weakened, the output voltage of solar battery group E reduced, when Vb satisfies the turn-on condition of triode T, and triode T conducting this moment, Vc is a high level, logic state transition is a logic high.By changing R
3Resistance, the voltage of logic high also will change, and select known bleeder circuit R
1, R
2Suitable resistance, the electric current of the utility model circuit will reach purpose low in energy consumption in the uA level.
Referring to Fig. 2, the utility model comprises photocell group E and a 74HC00 chip IC of using as gate, the negative pole end ground connection of said photocell group E, its positive terminal is connected with the 2nd input pin of chip IC, is connected to earth resistance R between the 2nd input pin of photocell group E and chip IC
4, resistance R
4Access can increase the stability of circuit.
When ambient light intensity weakens, when the output voltage of photocell group E was lower than 1V, the 2nd input pin level of 74HC00 chip IC was logic low, controls as needs, can pass through 1 pin (4,9,12) input, corresponding logic output just be arranged at output 3 pin (6,8,11).The condition that this scheme is suitable for is, ambient light intensity weakens the output voltage of time battery pack about 1 volt, and the output voltage of photocell group is not more than the input ceiling voltage of IC.
When ambient light intensity weakens, the photovoltaic property difference of the photocell group E of different structure, various combination, for for the chip IC of logic switch, the quiescent dissipation of COMOS structure is little, the input current maximum is at 1uA, when power supply be+during 5V, the low-voltage of TTL structure is input as 0.8V, high voltage is input as 2V, the low-voltage of COMS structure is input as 1V, high voltage is input as 3.5V.In sum, the utility model when assembling should the corresponding components and parts of supporting as required assembling to satisfy instructions for use.
Claims (4)
1, a kind of Low light switch comprises photocell group E, it is characterized in that: the negative pole end ground connection of described photocell group E, its positive terminal is connected with logic switch.
2, a kind of Low light switch according to claim 1, it is characterized in that: described logic switch comprises triode T, resistance R
1, resistance R
2And resistance R
3, the positive terminal of described photocell group E is connected to the base stage of triode T, and the collector electrode of described triode T is through resistance R
3Ground connection, its emitter is connected to resistance R
1Resistance R with ground connection
2Node, described resistance R
1Be connected on the reference voltage.
3, a kind of Low light switch according to claim 1 is characterized in that: described logic switch is a gate, and the positive terminal of described photocell group E is connected with its logic input terminal.
4, a kind of Low light switch according to claim 3 is characterized in that: be connected to earth resistance R between described photocell group E and the gate logic input terminal
4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224444 CN2534736Y (en) | 2002-01-18 | 2002-01-18 | Low light switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224444 CN2534736Y (en) | 2002-01-18 | 2002-01-18 | Low light switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2534736Y true CN2534736Y (en) | 2003-02-05 |
Family
ID=33701860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02224444 Expired - Fee Related CN2534736Y (en) | 2002-01-18 | 2002-01-18 | Low light switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2534736Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326781A (en) * | 2012-03-19 | 2013-09-25 | 富士通株式会社 | Optical switching apparatus and method |
-
2002
- 2002-01-18 CN CN 02224444 patent/CN2534736Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326781A (en) * | 2012-03-19 | 2013-09-25 | 富士通株式会社 | Optical switching apparatus and method |
| CN103326781B (en) * | 2012-03-19 | 2016-03-16 | 富士通株式会社 | Optical switching device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |