CN201821539U - Lamp switching circuit of battery charger - Google Patents
Lamp switching circuit of battery charger Download PDFInfo
- Publication number
- CN201821539U CN201821539U CN2010202876578U CN201020287657U CN201821539U CN 201821539 U CN201821539 U CN 201821539U CN 2010202876578 U CN2010202876578 U CN 2010202876578U CN 201020287657 U CN201020287657 U CN 201020287657U CN 201821539 U CN201821539 U CN 201821539U
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- lamp
- circuit
- led
- triode
- battery charger
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to a lamp switching circuit of a battery charger. The circuit comprises a lamp switching triode Q1 of a high frequency transformer TR and current detection circuits D2 and R1, wherein a power supply circuit consists of a secondary winding (III) of the high frequency transformer TR, a rectification diode D1 and a filter capacitor C1; one end of the secondary winding (III) of the high frequency transformer TR is connected with a positive electrode of the rectification diode D1, and the other end and a negative electrode of the filter capacitor C1 are connected to the ground (GND); and the positive electrode of the current detection circuit D2 is connected with one end of the R1, and the negative electrode of D2 is connected with the other end of the R1. As an operation amplifier and a reference voltage component are saved, the lamp switching circuit of the battery charger is greatly simplified, and the production cost and the cost of components and parts are reduced. The lamp switching circuit of the battery charger is mainly applied in switching lamp circuits of the battery chargers with medium and low power lamp, such as electronic toy products.
Description
Technical field: the utility model relates to a kind of circuit, and especially a kind of battery charger changes circuit for lamp, relates to the battery boosting technology field.
Background technology: in, in the small power electric electrolytic battery charger family, it is a safe and reliable importance of battery charge that battery charge is changeed the lamp indication, its directly reaction prevent battery overcharge and cause that battery fills personal safety bad, that explode, jeopardize us to user's indicating status that charges.
At present, existing charging commentaries on classics lamp typical circuit is generally selected for use operational amplifier to compare device and is realized changeing the lamp function.This typical circuit comprises: operational amplifier, current detection circuit, reference voltage device are formed.
As shown in Figure 1, R4, R5, R6, ZD1, C11 form reference voltage and are connected to amplifier 2 pin, and R7, R8 form current detection circuit.When charger charges the battery, become level and smooth direct current by D1 rectification, C1 filtering and supply with battery charge, have electric current to flow through on the R7 this moment, the R7 two ends form voltage, and this voltage is compared with 2 pin reference voltages by 3 pin of current-limiting resistance R8 to IC1A, and this moment, 3 pin voltages were greater than 2 pin, it is luminous that comparator 1 pin output high level is lighted LED2, indication user this state is for charging, and while Q2 base stage obtains high level and conducting drags down LED1 voltage it can not be lighted.
When battery is full of, cell voltage raises, electric current on the R7 reduces, and the R7 both end voltage reduces, and this voltage is compared with 2 pin to amplifier 3 pin by R8,3 pin are less than 2 pin voltages, amplifier is overturn at this moment and is output as low level, and LED2 can not light, and simultaneously Q2 can not conducting, Vcc powers to LED1 by divider resistance R1 and lights, and this state of indication user is that battery is full of.
Adopt the weak point of above-mentioned commentaries on classics circuit for lamp to be: used components and parts are more, circuit more complicated, production failure rate height, components and parts cost height.
Summary of the invention: at above-mentioned the deficiencies in the prior art, the utility model provides a kind of circuit simple, and the battery charger that cost is low changes circuit for lamp.
For achieving the above object, the technical solution adopted in the utility model is: a kind of battery charger changes circuit for lamp, comprise high frequency transformer TR, change lamp triode Q1, current detection circuit D2, R1, power supply circuits are made up of TR level of high frequency transformer III, rectifier diode D1, filter capacitor C1, high frequency transformer TR secondary winding III one end is connected with rectifier diode D1 positive pole, its other end and filter capacitor C1 negative pole are connected to GND, it is characterized in that: described current detection circuit D2 is anodal to be connected with R1 one end, and the D2 negative pole is connected with the R1 other end.Changeing circuit for lamp is made up of triode Q1, current-limiting resistance R2, divider resistance R3, LED 1, LED 2.Triode Q1 emitter is connected with filter capacitor C1 positive pole, D2 negative pole, and triode Q1 base stage and current-limiting resistance R2 one end join, and triode Q1 collector electrode is connected with LED 1 positive pole.The current-limiting resistance R2 other end is connected with the D2 negative pole, and LED 2 positive poles link to each other with the D2 negative pole, and LED 1 negative pole links to each other with LED 2 negative poles, and node links to each other with R3 one end, another termination of R3 GND.
The utility model has been simplified battery charger greatly and has been changeed circuit for lamp owing to saved an operational amplifier and reference voltage assembly, and production cost and components and parts cost have all reduced.During the utility model is mainly used in, in the small power electric electrolytic battery charger commentaries on classics circuit for lamp, in the electronic toy series products.
Description of drawings:
Fig. 1 is the schematic diagram of the existing battery charger commentaries on classics circuit for lamp of being made up of operational amplifier etc.
Fig. 2 is the schematic diagram that the battery charger of utility model changes circuit for lamp.
Embodiment:
As shown in Figure 2: high-frequency alternating current obtains level and smooth DC power supply after rectifier diode D1 rectification, C1 filtering.When charging the battery, the D2 two ends have electric current to flow through and form voltage makes the Q1 conducting, and LED1 lights.Can not light owing to LED2 is under-voltage this moment, and this state of indication user is that battery charges.Cell voltage rises when battery is full of, and flowing through D2 two ends electric current is zero, and the D2 both end voltage equates, Q1 does not have bias voltage to end LED1 can not be lighted, and LED2 forms the loop with R3 and makes it to light simultaneously, and indicating this state of user is that battery is full of.
Claims (1)
1. a battery charger changes circuit for lamp, it is characterized in that: comprise high frequency transformer TR, change lamp triode Q1, current detection circuit D2, R1, power supply circuits are by TR level of high frequency transformer III, rectifier diode D1, filter capacitor C1 forms, high frequency transformer TR secondary winding III one end is connected with rectifier diode D1 positive pole, its other end and filter capacitor C1 negative pole are connected to GND, described current detection circuit D2 is anodal to be connected with R1 one end, the D2 negative pole is connected with the R1 other end, change circuit for lamp by triode Q1, current-limiting resistance R2, divider resistance R3, LED 1, LED 2 is formed, triode Q1 emitter and filter capacitor C1 positive pole, the D2 negative pole is connected, triode Q1 base stage and current-limiting resistance R2 one end join, triode Q1 collector electrode is connected with LED 1 positive pole, the current-limiting resistance R2 other end is connected with the D2 negative pole, LED 2 positive poles link to each other with the D2 negative pole, LED 1 negative pole links to each other with LED 2 negative poles, node links to each other with R3 one end, another termination of R3 GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202876578U CN201821539U (en) | 2010-08-10 | 2010-08-10 | Lamp switching circuit of battery charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202876578U CN201821539U (en) | 2010-08-10 | 2010-08-10 | Lamp switching circuit of battery charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201821539U true CN201821539U (en) | 2011-05-04 |
Family
ID=43919480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202876578U Expired - Lifetime CN201821539U (en) | 2010-08-10 | 2010-08-10 | Lamp switching circuit of battery charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201821539U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969707A (en) * | 2010-08-10 | 2011-02-09 | 佛山市顺德区瑞德电子实业有限公司 | Revolving light circuit of battery charger |
-
2010
- 2010-08-10 CN CN2010202876578U patent/CN201821539U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969707A (en) * | 2010-08-10 | 2011-02-09 | 佛山市顺德区瑞德电子实业有限公司 | Revolving light circuit of battery charger |
| CN101969707B (en) * | 2010-08-10 | 2015-12-30 | 广东瑞德智能科技股份有限公司 | A kind of lamp switching circuit of battery charger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., Free format text: FORMER NAME: FOSHAN SHUNDE REALDESIGN ELECTRONICS INDUSTRY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528200, No. 1, Rui Xiang Road, Daliang Industrial Park, Shunde District, Guangdong, Foshan, Fengxiang Patentee after: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., LTD. Address before: 528200 Guangdong province Foshan city Shunde District Daliang Industrial Park Fengxiang Huaye Road No. 1 Patentee before: Foshan Shunde Realdesign Electronics Industry Co., Ltd. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20110504 Effective date of abandoning: 20151230 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |