CN2781621Y - Desk lamp capable of charging - Google Patents
Desk lamp capable of charging Download PDFInfo
- Publication number
- CN2781621Y CN2781621Y CNU2004201144115U CN200420114411U CN2781621Y CN 2781621 Y CN2781621 Y CN 2781621Y CN U2004201144115 U CNU2004201144115 U CN U2004201144115U CN 200420114411 U CN200420114411 U CN 200420114411U CN 2781621 Y CN2781621 Y CN 2781621Y
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- CN
- China
- Prior art keywords
- circuit
- utility
- desk lamp
- model
- resistance
- 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
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Abstract
The utility model discloses a desk lamp capable of charging. The utility model is characterized in that a voltage shortage protection circuit is arranged on a circuit plate; the voltage shortage protection circuit is respectively connected with a charging circuit, a current limiting circuit and a light source circuit. An internal circuit of the desk lamp capable of charging provided by the utility model adopts the voltage shortage protection circuit and the current limiting circuit, which effectively improves the safe performance and the service life of the utility model. An LED lamp tube is adopted as a light source for lighting, the power consumption is low and the brightness is high. An outer shell of the utility model is made of soft silica gel, which can obtain the insulation effect and prevent the accident of electric shock effectively. The whole appearance is beautiful.
Description
Technical field:
Utility model relates to the technical field of lighting apparatus, a kind of specifically chargeable desk lamp, particularly its internal circuit structure.
Background technology:
Existing desk lamp is generally two kinds; first kind is adopted bulb as light source; and adopt the 220V power supply; bulb is short service time; damage easily, it is very inconvenient to change, and need insert electric wire when using; when put in some place; it is very unbecoming that electric wire seems, second kind is also adopted bulb as light source, and has laid rechargeable battery in lamp body inside; after finishing, charging just can use; be characterized in and lay everywhere, need not be subjected to the restriction of wiring, but existing this type of chargeable desk lamp internal circuit configuration is unreasonable; generally do not establish any voltage protection circuit, poor safety performance; useful life is short; energy consumption is big.
Summary of the invention:
Some shortcomings such as the purpose of this utility model is to provide a kind of chargeable desk lamp, and it can overcome existing chargeable desk lamp poor safety performance, useful life is short, power consumption is big.
To achieve these goals; the technical solution of the utility model is: a kind of chargeable desk lamp; it mainly comprises shell; circuit board in the enclosure is set; it is characterized in that: described circuit board is provided with under-voltage protecting circuit, and under-voltage protecting circuit connects respectively at charging circuit, current-limiting circuit, circuit of light sources.
The utility model provides a kind of chargeable desk lamp; under-voltage protecting circuit, current-limiting circuit have been adopted in its internal circuit design; effectively improve security of products energy and useful life, lighting source adopts LED fluorescent tube, low-power consumption; high brightness; product casing adopts soft silica gel to make, and has insulation effect, can effectively prevent the contact accident; and moulded have an aesthetic feeling, is easy to apply.
Description of drawings:
Fig. 1 is the utility model circuit block diagram
Fig. 2 is the utility model circuit theory diagrams
Embodiment:
The utility model will be further described below in conjunction with drawings and Examples.The utility model mainly comprises shell; circuit board in the enclosure is set; it is different from prior art and is: described circuit board is provided with under-voltage protecting circuit 1; under-voltage protecting circuit respectively with charging circuit 2; current-limiting circuit 3; circuit of light sources 4 connects; the positive pole of voltage-stabiliser tube in the under-voltage protecting circuit (D2) respectively with resistance (R1); one end of resistance (R2) connects; the negative pole of voltage-stabiliser tube (D2) is connected with an end of switch (K); the other end of resistance (R2) connects the base stage of triode (Q1); the other end of resistance (R1) connects the emitter of triode (Q1) respectively; one end of the resistance in the current-limiting circuit (R3); the collector electrode of triode (Q1) is connected with light-emitting diode (LED1) in the circuit of light sources; the other end of resistance in the current-limiting circuit (R3) is connected with the positive pole of diode (D1), and the negative pole of diode (D1) is connected with contact J.Circuit of light sources is formed in parallel by at least 2 light-emitting diodes, and product casing adopts soft silica gel to make, and has insulation effect.
Under-voltage protecting circuit is made up of voltage-stabiliser tube D2, triode Q1, resistance R 1, resistance R 2 elements, and when cell voltage was lower than rated value 82%, voltage-stabiliser tube D2 did not puncture; the no current circulation, triode Q1 ends, and led current flows through; battery is turn-offed, thus protection battery E overdischarge.
The utility model only can be realized charging and the function of not discharging, when with the 4.8VDc power source charges, plug inserts, make D2 and Q1 no-voltage to be disconnected contact J tripping, cut off battery light-emitting diode is powered, the light-emitting diode power supply can only directly be obtained from 4.8VDc by resistance R 4, thereby the assurance battery can only charge into, and can not make battery guarantee to charge normal and do not discharge to the light-emitting diodes tube discharge.
When with the 4.8VDc power source charges, power supply is by battery and diode D1, and resistance R 3 chargings are when electric current is excessive, because the input characteristic of diode, when voltage drop is risen, electric current is reduced automatically, play the autobalance effect, resistance R 3 is big because of the big pressure drop of electric current, also play balanced action, so diode D1, resistance R 3 play current limliting, autobalance effect in the circuit in charging, battery is not damaged because of big electric current.
Claims (4)
1, a kind of chargeable desk lamp, it mainly comprises shell, and circuit board in the enclosure is set, and it is characterized in that: described circuit board is provided with under-voltage protecting circuit, and under-voltage protecting circuit connects respectively at charging circuit, current-limiting circuit, circuit of light sources.
2, by the described a kind of chargeable desk lamp of claim 1; it is characterized in that: the positive pole of voltage-stabiliser tube in the under-voltage protecting circuit (D2) is connected with an end of resistance (R1), resistance (R2) respectively; the negative pole of voltage-stabiliser tube (D2) is connected with an end of switch (K); the other end of resistance (R2) connects the base stage of triode (Q1); the other end of resistance (R1) connects the emitter of triode (Q1), an end of the resistance in the current-limiting circuit (R3) respectively; the collector electrode of triode (Q1) is connected with light-emitting diode (LED1) in the circuit of light sources.
3, by the described a kind of chargeable desk lamp of claim 1, it is characterized in that: the other end of resistance in the current-limiting circuit (R3) is connected with the positive pole of diode (D1), and the negative pole of diode (D1) is connected with contact J-.
4, by the described a kind of chargeable desk lamp of claim 1, it is characterized in that: circuit of light sources is formed in parallel by at least 2 light-emitting diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004201144115U CN2781621Y (en) | 2004-12-17 | 2004-12-17 | Desk lamp capable of charging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004201144115U CN2781621Y (en) | 2004-12-17 | 2004-12-17 | Desk lamp capable of charging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2781621Y true CN2781621Y (en) | 2006-05-17 |
Family
ID=36762819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004201144115U Expired - Fee Related CN2781621Y (en) | 2004-12-17 | 2004-12-17 | Desk lamp capable of charging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2781621Y (en) |
-
2004
- 2004-12-17 CN CNU2004201144115U patent/CN2781621Y/en not_active Expired - Fee Related
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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 |