CN204045189U - Small size color screen backlight control circuit - Google Patents
Small size color screen backlight control circuit Download PDFInfo
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- CN204045189U CN204045189U CN201420486560.8U CN201420486560U CN204045189U CN 204045189 U CN204045189 U CN 204045189U CN 201420486560 U CN201420486560 U CN 201420486560U CN 204045189 U CN204045189 U CN 204045189U
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Abstract
The utility model provides small size color screen backlight control circuit, it comprises feed circuit and trigger circuit, feed circuit comprise diode, diode connects filtering circuit, diode connects the VIN input end of MAX5035 DC-DC chip, diode also connects the ON/OFF input end of MAX5035 DC-DC chip, the BST end of MAX5035 DC-DC chip connects electric capacity, electric capacity connects the positive pole of voltage stabilizing diode (D2), the minus earth of this voltage stabilizing diode, the LX end of MAX5035 DC-DC chip is connected to electric capacity, the common port of voltage stabilizing diode and inductance, this inductance is contact resistance respectively, filter capacitor, filter capacitor and LED positive terminal, the FB end of MAX5035 DC-DC chip is connected with resistance, described trigger circuit comprise control end, control end contact resistance, resistance is the base stage of connecting triode and the collector of triode respectively, and the collector of triode has LED negative terminals, the emitter contact resistance of triode, the other end of resistance and the equal ground connection of the emitter of triode.
Description
Technical field
The utility model relates to a kind of colorful display screen, specifically, relate to a kind of small size color screen backlight control circuit.
Background technology
Small size color screen uses professional LED drive chip in conjunction with peripheral hardware circuit usually to control backlight, this adds increased the space that components and parts take PCB, improve the cost of development of hardware, technician is found by research, microprocessor can send control signal by I/O mouth, signal is PWM ripple, signal frequency is set by microprocessor, by the adjustable change signal dutyfactor of software, if send control signal to control small size color screen backlight illumination by microprocessor I/O mouth, so, just can not in the backlight control mode adopting above-mentioned high cost, but, in prior art, there is not the circuit coordinating to realize above-mentioned functions with microprocessor I/O.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, thus provides small size color screen backlight control circuit.
To achieve these goals, the technical scheme that the utility model adopts is: small size color screen backlight control circuit, it comprises feed circuit and trigger circuit, described feed circuit comprise for the positive terminal that connect corresponding to DC power anode, this positive terminal connects thermistor (RT1), described thermistor (RT1) connects the positive pole of diode (D1), the negative pole of this diode (D1) connects filtering circuit, described filtering circuit is by two electric capacity (C1, C2) formation in parallel, one end of this filtering circuit connects the negative pole of described diode (D1) and other end ground connection, the negative pole of described diode (D1) connects the VIN input end of MAX5035 DC-DC chip, the negative pole of described diode also connects the ON/OFF input end of described MAX5035 DC-DC chip by current-limiting resistance (R1), the SGND end of described MAX5035 DC-DC chip holds ground connection with GND and its VD end is connected electric capacity (C3), the other end ground connection of electric capacity (C3), the BST end of described MAX5035 DC-DC chip connects electric capacity (C4), the other end of electric capacity (C4) connects the positive pole of voltage stabilizing diode (D2), the minus earth of this voltage stabilizing diode (D2), the LX end of described MAX5035 DC-DC chip is connected to electric capacity (C4), the common port of voltage stabilizing diode (D2) and inductance (L1), the other end contact resistance (R2) respectively of this inductance (L1), filter capacitor (C5), filter capacitor (C6) and the LED positive terminal for being connected with LED positive pole, the other end contact resistance (R3) of resistance (R2), resistance (R3), the equal ground connection of the other end of filter capacitor (C5) and filter resistance (C6), the FB end of described MAX5035 DC-DC chip is connected with the common port of resistance (R2) and resistance (R3), described trigger circuit comprise the control end for being connected with microprocessor I/O mouth, described control end is contact resistance (R4) and resistance (R5) respectively, the other end base stage of connecting triode (Q1) and the collector of triode (Q2) respectively of described resistance (R4), the collector of triode (Q1) has the LED negative terminals for being connected with LED negative pole, the emitter contact resistance (R6) of triode (Q1), the equal ground connection of emitter of the other end of resistance (R5), the other end of resistance (R6) and triode (Q2).
The utility model hinge structure has substantive distinguishing features and progress, specifically, in small size color screen backlight control circuit, direct current carries out after filtering by MAX5035 DC-DC chip by feed circuit, and again after filtering for LED positive pole is powered, these trigger circuit can be controlled the ON time of triode (Q1) by PWM ripple, thus control the electric current flowing through LED in the unit interval, change the brightness of LED, control small size color screen backlight illumination.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment small-medium size color screen backlight control circuit.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1, small size color screen backlight control circuit, it comprises feed circuit and trigger circuit, described feed circuit comprise for the positive terminal B+ that connect corresponding to DC power anode, this positive terminal connects thermistor (RT1), thermistor (RT1) is for surge current suppression, described thermistor (RT1) connects the positive pole of diode (D1), the negative pole of this diode (D1) connects filtering circuit, described filtering circuit is by two electric capacity (C1, C2) formation in parallel, one end of this filtering circuit connects the negative pole of described diode (D1) and other end ground connection, the negative pole of described diode (D1) connects the VIN input end of MAX5035 DC-DC chip, MAX5035 DC-DC chip has under-voltage locking, Cycle by Cycle current limit, pattern of having the hiccups output short circuit protection and Thermal shutdown function.The negative pole of described diode also connects the ON/OFF input end of described MAX5035 DC-DC chip by current-limiting resistance (R1), the SGND end of described MAX5035 DC-DC chip holds ground connection with GND and its VD end is connected electric capacity (C3), the other end ground connection of electric capacity (C3), the BST end of described MAX5035 DC-DC chip connects electric capacity (C4), the other end of electric capacity (C4) connects the positive pole of voltage stabilizing diode (D2), the minus earth of this voltage stabilizing diode (D2), the LX end of described MAX5035 DC-DC chip is connected to electric capacity (C4), the common port of voltage stabilizing diode (D2) and inductance (L1), the other end contact resistance (R2) respectively of this inductance (L1), filter capacitor (C5), filter capacitor (C6) and the LED positive terminal for being connected with LED positive pole, the other end contact resistance (R3) of resistance (R2), resistance (R3), the equal ground connection of the other end of filter capacitor (C5) and filter resistance (C6), the FB end of described MAX5035 DC-DC chip is connected with the common port of resistance (R2) and resistance (R3), described trigger circuit comprise the control end for being connected with microprocessor I/O mouth, described control end is contact resistance (R4) and resistance (R5) respectively, the other end base stage of connecting triode (Q1) and the collector of triode (Q2) respectively of described resistance (R4), the collector of triode (Q1) has the LED negative terminals for being connected with LED negative pole, the emitter contact resistance (R6) of triode (Q1), the equal ground connection of emitter of the other end of resistance (R5), the other end of resistance (R6) and triode (Q2).
The utility model hinge structure has substantive distinguishing features and progress, specifically, in small size color screen backlight control circuit, direct current carries out after filtering by MAX5035 DC-DC chip by feed circuit, and again after filtering for LED positive pole is powered, these trigger circuit can be controlled the ON time of triode (Q1) by PWM ripple, thus control the electric current flowing through LED in the unit interval, change the brightness of LED, control small size color screen backlight illumination.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (1)
1. small size color screen backlight control circuit, it is characterized in that: it comprises feed circuit and trigger circuit, described feed circuit comprise for the positive terminal that connect corresponding to DC power anode, this positive terminal connects thermistor (RT1), described thermistor (RT1) connects the positive pole of diode (D1), the negative pole of this diode (D1) connects filtering circuit, described filtering circuit is by two electric capacity (C1, C2) formation in parallel, one end of this filtering circuit connects the negative pole of described diode (D1) and other end ground connection, the negative pole of described diode (D1) connects the VIN input end of MAX5035 DC-DC chip, the negative pole of described diode also connects the ON/OFF input end of described MAX5035 DC-DC chip by current-limiting resistance (R1), the SGND end of described MAX5035 DC-DC chip holds ground connection with GND and its VD end is connected electric capacity (C3), the other end ground connection of electric capacity (C3), the BST end of described MAX5035 DC-DC chip connects electric capacity (C4), the other end of electric capacity (C4) connects the positive pole of voltage stabilizing diode (D2), the minus earth of this voltage stabilizing diode (D2), the LX end of described MAX5035 DC-DC chip is connected to electric capacity (C4), the common port of voltage stabilizing diode (D2) and inductance (L1), the other end contact resistance (R2) respectively of this inductance (L1), filter capacitor (C5), filter capacitor (C6) and the LED positive terminal for being connected with LED positive pole, the other end contact resistance (R3) of resistance (R2), resistance (R3), the equal ground connection of the other end of filter capacitor (C5) and filter resistance (C6), the FB end of described MAX5035 DC-DC chip is connected with the common port of resistance (R2) and resistance (R3), described trigger circuit comprise the control end for being connected with microprocessor I/O mouth, described control end is contact resistance (R4) and resistance (R5) respectively, the other end base stage of connecting triode (Q1) and the collector of triode (Q2) respectively of described resistance (R4), the collector of triode (Q1) has the LED negative terminals for being connected with LED negative pole, the emitter contact resistance (R6) of triode (Q1), the equal ground connection of emitter of the other end of resistance (R5), the other end of resistance (R6) and triode (Q2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420486560.8U CN204045189U (en) | 2014-08-27 | 2014-08-27 | Small size color screen backlight control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420486560.8U CN204045189U (en) | 2014-08-27 | 2014-08-27 | Small size color screen backlight control circuit |
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| Publication Number | Publication Date |
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| CN204045189U true CN204045189U (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420486560.8U Active CN204045189U (en) | 2014-08-27 | 2014-08-27 | Small size color screen backlight control circuit |
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| Country | Link |
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| CN (1) | CN204045189U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017181493A1 (en) * | 2016-04-20 | 2017-10-26 | 成都艾尔伯特科技有限责任公司 | Power circuit for led light adjusting plate |
| WO2021088253A1 (en) * | 2019-11-04 | 2021-05-14 | 海信视像科技股份有限公司 | Display device |
-
2014
- 2014-08-27 CN CN201420486560.8U patent/CN204045189U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017181493A1 (en) * | 2016-04-20 | 2017-10-26 | 成都艾尔伯特科技有限责任公司 | Power circuit for led light adjusting plate |
| WO2021088253A1 (en) * | 2019-11-04 | 2021-05-14 | 海信视像科技股份有限公司 | Display device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |