CN201878372U - Circuit for inhibiting zero drift of backlight input - Google Patents
Circuit for inhibiting zero drift of backlight input Download PDFInfo
- Publication number
- CN201878372U CN201878372U CN2010205325609U CN201020532560U CN201878372U CN 201878372 U CN201878372 U CN 201878372U CN 2010205325609 U CN2010205325609 U CN 2010205325609U CN 201020532560 U CN201020532560 U CN 201020532560U CN 201878372 U CN201878372 U CN 201878372U
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- triode
- resistance
- circuit
- backlight
- zero drift
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- 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.)
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Abstract
The utility model discloses a circuit for inhibiting zero drift of backlight input; a pulse-width modulation (PWM) signal end is connected with a base electrode of a triode by a divider resistor; a collector electrode of the triode is connected with a power supply end by a resistor, and is also connected with a micro-programmed control unit (MCU) processing end; an emitting electrode of the triode is in ground connection; and the base electrode of the triode is connected with the emitting electrode by the resistor. The circuit for inhibiting zero drift of backlight input is capable of effectively avoiding the zero drift, is simple and easy to realize, and ensures backlight adjustment to be normal and accurate.
Description
Technical field
The utility model relates to the circuit that suppresses input null offset backlight in a kind of automobile instrument.
Background technology
Current vehicle complete vehicle electronic system is more and more huger, and the car load harness wiring also becomes increasingly complex, and causes the drift on car load ground.And most of Combined Instrument on Passenger Vehicles outside input pwm signal (pulse width modulating signal) that all adopts backlight is controlled, no matter be that MCU (single-chip microcomputer) directly monitors the pwm signal change in duty cycle and controls backlight or the MCU monitoring voltage, wherein pwm signal is changed by the RC integrating circuit and is controlled backlightly, and drift all can cause adjustable range backlight to diminish even can not regulate.Generally, can't effectively avoid the car load drift.
The utility model content
The technical problems to be solved in the utility model is to realize that a kind of circuit can reach the effect that inhibition null offset makes normal regulating backlight.
To achieve these goals, the technical solution adopted in the utility model is: a kind of inhibition input null offset backlight circuit, the pwm signal end connects transistor base through divider resistance, the collector electrode of triode connects power end through resistance, its collector electrode also is connected with the MCU end for process, the grounded emitter of triode, the base stage of triode connects its emitter through resistance.
It is 5V that described power end inserts supply voltage, and the resistance between transistor base and the pwm signal end is 100K Ω, and resistance is 16K Ω between the resistance between base stage and the emitter.
The resistance of the resistance between described power end and transistor collector is 100K Ω.
Advantage of the present utility model is to suppress input null offset circuit backlight can effectively avoid null offset, and circuit is simple, easily realizes, makes adjusting backlight normal and accurate.
Description of drawings
Below the content of each width of cloth accompanying drawing expression of the utility model specification and the mark among the figure are made brief description:
Fig. 1 is the utility model circuit theory diagrams;
Mark among the above-mentioned figure is: 1, triode; 2, pwm signal end; 3, MCU end for process; 4, power end; 5, resistance; 6, resistance; 7, resistance.
Embodiment
The input null offset backlight of inhibition as shown in Figure 1 circuit, its circuit structure is: pwm signal end 2 connects triode 1 base stage through divider resistance 5, the collector electrode of triode 1 connects power end 4 through resistance 7, its collector electrode also is connected with MCU end for process 3, the grounded emitter of triode 1, the base stage of triode 1 connects its emitter through resistance 6.When input pwm signal backlight is only controlled the break-make of triode 1, pwm signal is not directly handled by MCU, even null offset this moment is bigger, the MCU that also can not disturb handles the pwm signal duty ratio, for two resistance 5 are used in the null offset that adapts in various degree, 6 bleeder circuits of forming, can shield in various degree drift by disposing different resistances, concrete numerical value is that power end 4 access supply voltages are 5V, resistance 5 between triode 1 base stage and the pwm signal end 2 is 100K Ω, resistance is 16K Ω between the resistance 6 between base stage and the emitter, power end 4 is 100K Ω with the resistance of the resistance 7 of triode 1 inter-collector, can suppress maximum null offset this moment and reach 4.3V.
When adopting the mode of monitoring integral voltage for MCU, only need the collector electrode of triode 1 is connected to 12V by pull-up resistor, add the RC integrating circuit after the collector electrode simultaneously, other components and parts are arranged as above-mentioned inconvenience can reach the effect that suppresses null offset.
Claims (3)
1. one kind is suppressed input null offset circuit backlight, it is characterized in that: the pwm signal end (2) of circuit connects triode (1) base stage through divider resistance (5), the collector electrode of triode (1) connects power end (4) through resistance (7), its collector electrode also is connected with MCU end for process (3), the grounded emitter of triode (1), the base stage of triode (1) connects its emitter through resistance (6).
2. inhibition according to claim 1 input null offset backlight circuit, it is characterized in that: it is 5V that described power end (4) inserts supply voltage, resistance (5) between triode (1) base stage and the pwm signal end (2) is 100K Ω, and resistance is 16K Ω between the resistance between base stage and the emitter (6).
3. inhibition according to claim 1 and 2 input null offset backlight circuit is characterized in that: described power end (4) is 100K Ω with the resistance of the resistance (7) of triode (1) inter-collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205325609U CN201878372U (en) | 2010-09-10 | 2010-09-10 | Circuit for inhibiting zero drift of backlight input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205325609U CN201878372U (en) | 2010-09-10 | 2010-09-10 | Circuit for inhibiting zero drift of backlight input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201878372U true CN201878372U (en) | 2011-06-22 |
Family
ID=44166279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205325609U Expired - Lifetime CN201878372U (en) | 2010-09-10 | 2010-09-10 | Circuit for inhibiting zero drift of backlight input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201878372U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103491395A (en) * | 2013-08-29 | 2014-01-01 | 广州视源电子科技股份有限公司 | Method for expanding peripheral units of smart television and smart television |
| CN109560808A (en) * | 2018-12-28 | 2019-04-02 | 南京康派电子有限公司 | A kind of novel UART interface level conversion and multiplex electronics |
| CN109784499A (en) * | 2018-12-21 | 2019-05-21 | 华南理工大学广州学院 | A kind of learning robot and control method |
-
2010
- 2010-09-10 CN CN2010205325609U patent/CN201878372U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103491395A (en) * | 2013-08-29 | 2014-01-01 | 广州视源电子科技股份有限公司 | Method for expanding peripheral units of smart television and smart television |
| CN103491395B (en) * | 2013-08-29 | 2017-05-10 | 广州视源电子科技股份有限公司 | Method for expanding peripheral units of smart television and smart television |
| CN109784499A (en) * | 2018-12-21 | 2019-05-21 | 华南理工大学广州学院 | A kind of learning robot and control method |
| CN109560808A (en) * | 2018-12-28 | 2019-04-02 | 南京康派电子有限公司 | A kind of novel UART interface level conversion and multiplex electronics |
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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: BOSCH AUTOMOBILE MULTIMEDIA (WUHU) CO., LTD. Free format text: FORMER OWNER: EITAIKE AUTOCAR ELECTRONICS (WUHU) CO., LTD. Effective date: 20131217 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 241000 WUHU, ANHUI PROVINCE TO: 241009 WUHU, ANHUI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131217 Address after: 241009 Anhui city of Wuhu Province Silver Lake Economic and Technological Development Zone No. 48 North Road Patentee after: BOSCH multimedia (Wuhu) Co., Ltd. Address before: 241000 Anhui city of Wuhu Province Silver Lake Economic and Technological Development Zone No. 48 North Road Patentee before: ATECH Automotive (Wuhu) Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 241009 Anhui city of Wuhu Province Silver Lake Economic and Technological Development Zone No. 48 North Road Patentee after: Bertek automotive electronics (Wuhu) Co., Ltd Address before: 241009 Anhui city of Wuhu Province Silver Lake Economic and Technological Development Zone No. 48 North Road Patentee before: Bosch Car Multimedia (Wuhu) Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |
|
| CX01 | Expiry of patent term |