CN205564255U - Ordinary DC -DC steps up and LCD compatible circuit who controls in a poor light - Google Patents
Ordinary DC -DC steps up and LCD compatible circuit who controls in a poor light Download PDFInfo
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- CN205564255U CN205564255U CN201620338281.6U CN201620338281U CN205564255U CN 205564255 U CN205564255 U CN 205564255U CN 201620338281 U CN201620338281 U CN 201620338281U CN 205564255 U CN205564255 U CN 205564255U
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Abstract
The utility model provides an ordinary DC DC steps up and the LCD compatible circuit who controls in a poor light, and it includes: control chip, a switch resistance, the 2nd switch resistance and pull down resistor, a switch resistance the 2nd switch resistance with the one end of pull down resistor is connected to control chip's messenger can the pin, the 3rd switch resistance, fourth switch resistance and the 5th switch resistance one end are connected to control chip's voltage feedback pin, the 3rd switch resistance's other end ground connection, fourth switch resistance's the other end is connected to control chip's voltage output pin, the 5th switch resistance's the other end is connected to current -limiting resistor and current feedback in a poor light end, current -limiting resistor's other end ground connection, supply electrical output. The utility model provides a have DC concurrently DC boost circuit and LCD back of the body light controlling circuit's circuit structure, easy operation practices thrift manufacturing cost.
Description
Technical field
This utility model belongs to LCD boosting and backlight control circuit field, common particularly to one
The compatible circuit that DC-DC boosting and LCD backlight control.
Background technology
LCD display mainly includes two big classes, and the first kind is to be provided with backlight control circuit on LCD, the
Two classes are to be not provided with backlight control circuit on LCD.Therefore, first kind LCD operationally, needs
PCB main board provides it a stable voltage；And during Equations of The Second Kind LCD work, then need PCB master
Plate carries out backlight control to it.
Along with the kind of smart electronics terminal on the market gets more and more, its developers are in order to carry further
Its competitiveness of product in market high and shortening construction cycle, often apply mechanically many on one piece of PCB main board of appearance
Nested structure ID profile.As it is shown in figure 1, in order to make PCB main board disclosure satisfy that above-mentioned two in prior art
The use demand of class LCD, the most general way is to reserve two on its PCB main board 1
Circuit, a circuit is the backlight drive circuit 100 of LCD, and another circuit is to provide stable voltage
DC-DC booster circuit 200, then select patch logical according to the practical situation of the LCD of required coupling
Corresponding circuit.
In prior art, two circuit structures of reserved design on PCB main board, so increase PCB's
Cloth member space, PCB main board area increases, and production cost increases.
Utility model content
In order to solve the problems referred to above, this utility model has designed and developed a kind of common DC-DC boosting and LCD
The compatible circuit of backlight control, ties common DC-DC boost chip and backlight control chip in same encapsulation
Make pin to pin form under structure, utilize switch resistance to be boosted by similar for operation principle common DC-DC
Circuit and LCD backlight control circuit are combined into the compatible electricity of common DC-DC boosting and LCD backlight control
Road, and arranged by the disconnection of switch resistance/connection, common DC-DC boosting and LCD backlight are controlled
Compatible circuit be arranged to common DC-DC booster circuit or LCD backlight control circuit.
This utility model provides the compatible circuit that a kind of common DC-DC boosting and LCD backlight control, its
Including: the power inductance of series connection and Schottky diode；
Control chip；
First switch resistance, second switch resistance and pull down resistor, described first switch resistance, described
Two switch resistances and described pull down resistor one end are connected to the enable pin of described control chip；
3rd switch resistance, the 4th switch resistance and the 5th switch resistance one end are connected to described control chip
Feedback pin；The other end ground connection of described 3rd switch resistance；The other end of described 4th switch resistance
It is connected to the voltage output pin of described control chip；The other end of described 5th switch resistance is connected to the back of the body
Photoelectric current feedback end；
Current-limiting resistance, its one end is connected to the other end of described 5th switch resistance, described current-limiting resistance
Other end ground connection；
Power supply outfan；
Wherein, described voltage output pin, the other end of described 4th switch resistance and described Schottky two
The outfan of pole pipe is connected to described power supply outfan.
When being provided with backlight control circuit on LCD, then need an offer burning voltage on PCB main board
Booster circuit, then in the compatible circuit above-mentioned common DC-DC boosting and LCD backlight controlled,
Arranging when the first switch resistance, Schottky diode and the 5th switch resistance disconnect, described current-limiting resistance pastes
It is set to 0 ohm, the compatible circuit that the most above-mentioned common DC-DC boosting and LCD backlight control realizes LCD
The circuit of backlight control is off, and arranges control in the region of the control chip of PCB main board
The control chip of DC-DC booster circuit, DC-DC booster circuit connects, when second switch resistance terminal is defeated
Entering GPIO or one and enable signal when drawing high, DC-DC booster circuit is started working, according to LCD
The actual voltage value that display backlight circuit needs, adjusts between the 3rd switch resistance, the 4th switch resistance
Resistance, control chip control power supply outfan output can make this LCD backlight normal circuit operation
Voltage.
Otherwise, when setting does not has backlight control circuit on LCD, then need an offer on PCB main board
Backlight control circuit, then in the compatible circuit above-mentioned common DC-DC boosting and LCD backlight controlled,
When second switch resistance, the 3rd switch resistance and the 4th switch resistance disconnect arrange, the most above-mentioned commonly
The compatible circuit that DC-DC boosting and LCD backlight control provides the DC-DC booster circuit of burning voltage
It is off, control LCD backlight control circuit is set in the region of the control chip of PCB main board
Control chip, LCD backlight control circuit connect, when first switch resistance input input a PWM
Signal, the backlight illumination needed according to LCD display, control chip controls power supply outfan output and electricity
Stream feedback end provides its electric current normally worked to LCD display.
Wherein in an embodiment, the compatibility that described common DC-DC boosting and LCD backlight control
In circuit, between described 4th switch resistance and described voltage output pin, connect one the 6th switch resistance.
In the compatible circuit that above-mentioned common DC-DC boosting and LCD backlight control, when this circuit communication system
When LCD backlight control circuit or common DC-DC booster circuit, the resistance value of the 6th switch resistance is equal
It is set to zero ohm.
Wherein in an embodiment, the compatibility that described common DC-DC boosting and LCD backlight control
In circuit, also include the first filter capacitor and the second filter capacitor；
Described first filter capacitor and described second filter capacitor are connected in parallel to described power supply outfan；
The pressure voltage of described first filter capacitor and described second filter capacitor is 50V.
Two the first filter capacitors in parallel and the second filter capacitor are set at power supply outfan, to ensure to supply
The voltage that electricity outfan output is stable.
Wherein in an embodiment, the compatibility that described common DC-DC boosting and LCD backlight control
In circuit, also include the 3rd filter capacitor；
One end of described 3rd filter capacitor is connected to described common DC-DC boosting and LCD backlight controls
The energization input of compatible circuit, the other end ground connection of described 3rd filter capacitor；
The pressure voltage of the other end of described 3rd filter capacitor is more than 6.3V.
At energization input, the voltage that the 3rd filter capacitor is stable to ensure input input is set.
Wherein in an embodiment, the compatibility that described common DC-DC boosting and LCD backlight control
In circuit, the grounding pin ground connection of described control chip.
Wherein in an embodiment, the compatibility that described common DC-DC boosting and LCD backlight control
In circuit, described second switch resistance, the 3rd switch resistance and described 4th switch resistance disconnect, and institute
State the 5th switch resistance and be set to zero ohm, connect LCD backlight control circuit.
Wherein in an embodiment, the compatibility that described common DC-DC boosting and LCD backlight control
In circuit, described first switch resistance, the 5th switch resistance and described Schottky diode disconnect, institute
Stating current-limiting resistance and being sticked is 0 ohm, connects DC-DC booster circuit.
The beneficial effects of the utility model are:
1, in the compatible circuit that described common DC-DC boosting and LCD backlight control, original
Build the while of one compatible common in the region of DC-DC booster circuit or LCD backlight control circuit
DC-DC booster circuit and the compatible circuit of LCD backlight control circuit, need optionally according to using
Connection DC-DC booster circuit or LCD backlight control circuit, by this circuit arrangement on a printed circuit,
Need not arrange DC-DC booster circuit and LCD backlight control circuit, joint the most simultaneously
Save the cloth member space of PCB, save production cost.
2, in the compatible circuit that described common DC-DC boosting and LCD backlight control, this circuit makes
During with, by being disconnected by switch resistance corresponding in circuit, and select suitable control chip,
Select the most in the circuit to connect common DC-DC booster circuit or connection LCD backlight control circuit, can
Strong operability.
Accompanying drawing explanation
Fig. 1 is for arranging DC-DC boosting and LCD backlight control simultaneously on a kind of prior art PCB main board
The schematic diagram of circuit；
Fig. 2 is the common DC-DC boosting described in one of them embodiment of this utility model and LCD backlight
The electrical block diagram of the compatible circuit controlled；
Fig. 3 is the common DC-DC boosting described in one of them embodiment of this utility model and LCD backlight
The electrical block diagram of the compatible circuit controlled；
Fig. 4 is the common DC-DC boosting described in one of them embodiment of this utility model and LCD backlight
The electrical block diagram of the compatible circuit controlled；
Fig. 5 is the common DC-DC boosting described in one of them embodiment of this utility model and LCD backlight
The electrical block diagram of the compatible circuit controlled.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in further detail, to make those skilled in the art
Can implement according to this with reference to description word.
As in figure 2 it is shown, a kind of common DC-DC boosting described in one of them embodiment of this utility model and
The compatible circuit that LCD backlight controls, comprising: the power inductance L1 and Schottky diode CR1 of series connection；
Control chip U1；The grounding pin GND ground connection of described control chip U1；
First switch resistance R1, second switch resistance R2 and pull down resistor R6, described first switch resistance
R1, described second switch resistance R2 and described pull down resistor R6 one end are connected to making of described control chip
Can pin EN；
3rd switch resistance R3, the 4th switch resistance R4 and the 5th switch resistance R5 one end are connected to institute
State feedback pin FB of control chip；The other end ground connection of described 3rd switch resistance R3；Described 4th
The other end of switch resistance R4 is connected to the voltage output pin VOUT of described control chip；Described 5th
The other end of switch resistance R5 is connected to photoelectric current feedback end+VBKLT_FB；
Current-limiting resistance R7, its one end is connected to current limliting electricity described in the other end of described 5th switch resistance R5
The other end ground connection of resistance R7；
Power supply outfan+BKLT；
Wherein, described voltage output pin+BKLT, the other end of described 4th switch resistance R4 and institute
The outfan stating Schottky diode CR1 is connected to described power supply outfan+BKLT.
First switch resistance R1, second switch resistance R2 and the 5th switch resistance R5 are in foregoing circuit
Disconnect and arrange or its resistance value is set to zero ohm；3rd switch resistance R3 and the 4th switch resistance
R4 foregoing circuit break setting or its resistance value is set to DC-DC booster circuit need output
The appropriate ratio of voltage.
Arrange when the first switch resistance R1, Schottky diode CR1 and the 5th switch resistance R5 disconnect,
And second switch resistance R2 is set to zero ohm, the 3rd switch resistance R3 and the 4th switch resistance R4 sets
Being set to suitable ratio, it is 0 ohm that described current-limiting resistance R7 is sticked；U1 pastes DC-DC boost chip,
In the circuit of the compatible circuit that the most above-mentioned common DC-DC boosting and LCD backlight control, LCD backlight control
Circuit processed disconnects, and DC-DC booster circuit connects, then foregoing circuit provides stable electricity for LCD display
The function of pressure.Otherwise, as second switch resistance R2, the 3rd switch resistance R3 and the 4th switch resistance R4
Disconnect and arranging, and the first switch resistance R1 and the 5th switch resistance R5 is set to zero ohm, Schottky two
Pole pipe CR1 is sticked in circuit, and U1 pastes backlight control chip, the most above-mentioned common DC-DC boosting and
In the circuit of the compatible circuit that LCD backlight controls, DC-DC booster circuit disconnects, and LCD backlight controls
Circuit communication, then foregoing circuit provides LCD backlight to control function for LCD display.
As it is shown on figure 3, a kind of common DC-DC boosting described in one of them embodiment of this utility model and
The compatible circuit that LCD backlight controls, on the basis of the embodiment shown in Fig. 2, at its outfan of powering
+ BKLT connects two the first filter capacitor C1 being arranged in parallel and the second filter capacitor C2；Meanwhile, exist
The power input of the compatible circuit that described common DC-DC boosting and LCD backlight control arranges one the
Three filter capacitor C3.In the present embodiment, utilize the voltage of the 3rd filter capacitor C3 stabilized power source input,
The the first filter capacitor C1 and the second filter capacitor C2 simultaneously utilizing parallel connection stablizes the voltage of outfan.
As shown in Figure 4, a kind of common DC-DC boosting described in one of them embodiment of this utility model and
In the compatible circuit that LCD backlight controls, on the basis of the embodiment shown in Fig. 2, open the described 4th
Close and between resistance R4 and described voltage output pin VOUT, connect one the 6th switch resistance R8, other electricity
Line structure is identical with the circuit structure shown in Fig. 2.
When the first switch resistance R1, Schottky diode CR1 and the 5th switch resistance in the present embodiment
R5 disconnects setting, and second switch resistance R2, the 6th switch resistance R6 and the 6th switch resistance R8 are arranged
Being zero ohm, the resistance of the 3rd switch resistance R3 and the 4th switch resistance R4 is set to suitable ratio,
It is 0 ohm that described current-limiting resistance R7 changes patch, and U1 pastes common DC-DC boost chip, the most above-mentioned commonly
In the circuit of the compatible circuit that DC-DC boosting and LCD backlight control, LCD backlight control circuit disconnects,
DC-DC booster circuit connects, then foregoing circuit provides the function of burning voltage for LCD display.Instead
It, arranged when second switch resistance R2, the 3rd switch resistance R3 and the 4th switch resistance R4 disconnect, and
First switch resistance R1, the 5th switch resistance R5 and the 6th switch resistance R8 are set to zero ohm, Xiao
On special based diode CR1 is sticked in foregoing circuit, U1 pastes backlight control chip, the most above-mentioned commonly
In the circuit of the compatible circuit that DC-DC boosting and LCD backlight control, DC-DC booster circuit disconnects,
LCD backlight control circuit connects, then foregoing circuit provides LCD backlight to control function for LCD display.
As it is shown in figure 5, a kind of common DC-DC boosting described in one of them embodiment of this utility model and
The compatible circuit that LCD backlight controls, on the basis of the embodiment shown in Fig. 4, at its outfan of powering
+ BKLT connects two the first filter capacitor C1 being arranged in parallel and the second filter capacitor C2；Meanwhile, exist
The power input of the compatible circuit that described common DC-DC boosting and LCD backlight control arranges one the 3rd
Filter capacitor C3.In the present embodiment, utilize the voltage of the 3rd filter capacitor C3 stabilized power source input,
The the first filter capacitor C1 and the second filter capacitor C2 simultaneously utilizing parallel connection stablizes the voltage of outfan.
Although embodiment of the present utility model is disclosed as above, but it is not restricted to description and reality
Executing listed in mode utilization, it can be applied to various applicable field of the present utility model completely, for
For those skilled in the art, it is easily achieved other amendment, therefore without departing substantially from claim
And under the general concept that limited of equivalency range, this utility model is not limited to specific details and shows here
The legend gone out and describe.
Claims (8)
1. the compatible circuit that common DC-DC boosting and LCD backlight control, it includes the merit of series connection
Rate inductance and Schottky diode, it is characterised in that also include:
Control chip；
First switch resistance, second switch resistance and pull down resistor, described first switch resistance, described
Two switch resistances and described pull down resistor one end are connected to the enable pin of described control chip；
3rd switch resistance, the 4th switch resistance and the 5th switch resistance one end are connected to described control chip
Feedback pin；The other end ground connection of described 3rd switch resistance；The other end of described 4th switch resistance
It is connected to the voltage output pin of described control chip；The other end of described 5th switch resistance is connected to the back of the body
Photoelectric current feedback end；
Current-limiting resistance, its one end is connected to the other end of described 5th switch resistance, described current-limiting resistance
Other end ground connection；
Power supply outfan；
Wherein, described voltage output pin, the other end of described 4th switch resistance and described Schottky two
The outfan of pole pipe is connected to described power supply outfan.
2. the compatible circuit that common DC-DC boosting as claimed in claim 1 and LCD backlight control,
It is characterized in that, between described 4th switch resistance and described voltage output pin, connect one the 6th switch electricity
Resistance.
3. the compatible circuit that common DC-DC boosting as claimed in claim 2 and LCD backlight control,
It is characterized in that, also include the first filter capacitor and the second filter capacitor；
Described first filter capacitor and described second filter capacitor are connected in parallel to described power supply outfan；
The pressure voltage of described first filter capacitor and described second filter capacitor is 50V.
4. the compatible circuit that common DC-DC boosting as claimed in claim 3 and LCD backlight control,
It is characterized in that, also include the 3rd filter capacitor；
One end of described 3rd filter capacitor is connected to described common DC-DC boosting and LCD backlight controls
The energization input of compatible circuit, the other end ground connection of described 3rd filter capacitor；
The pressure voltage of the other end of described 3rd filter capacitor is more than 6.3V.
5. the compatible circuit that common DC-DC boosting as claimed in claim 4 and LCD backlight control,
It is characterized in that, the grounding pin ground connection of described control chip.
6. the compatible circuit that common DC-DC boosting as claimed in claim 5 and LCD backlight control,
It is characterized in that, described second switch resistance, the 3rd switch resistance and described 4th switch resistance disconnect,
And described 5th switch resistance is set to zero ohm, then connection LCD backlight control circuit.
7. the compatible circuit that common DC-DC boosting as claimed in claim 6 and LCD backlight control,
It is characterized in that, described first switch resistance, the 5th switch resistance and described Schottky diode disconnect,
Described current-limiting resistance is 0 ohm, then connect DC-DC booster circuit.
8. the compatible circuit that common DC-DC boosting as claimed in claim 1 and LCD backlight control,
It is characterized in that, the resistance of described pull down resistor is 22K to 330K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620338281.6U CN205564255U (en) | 2016-04-21 | 2016-04-21 | Ordinary DC -DC steps up and LCD compatible circuit who controls in a poor light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620338281.6U CN205564255U (en) | 2016-04-21 | 2016-04-21 | Ordinary DC -DC steps up and LCD compatible circuit who controls in a poor light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205564255U true CN205564255U (en) | 2016-09-07 |
Family
ID=56810033
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620338281.6U Active CN205564255U (en) | 2016-04-21 | 2016-04-21 | Ordinary DC -DC steps up and LCD compatible circuit who controls in a poor light |
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| CN (1) | CN205564255U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373533A (en) * | 2016-11-23 | 2017-02-01 | 上海传英信息技术有限公司 | Backlight drive circuit and backlight drive current adjustment method |
| CN113012649A (en) * | 2021-02-02 | 2021-06-22 | 深圳市江元科技(集团)有限公司 | Backlight output circuit and terminal equipment |
| WO2022188361A1 (en) * | 2021-03-12 | 2022-09-15 | 威胜集团有限公司 | Mbus host sending circuit, bus system and signal sending method |
-
2016
- 2016-04-21 CN CN201620338281.6U patent/CN205564255U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373533A (en) * | 2016-11-23 | 2017-02-01 | 上海传英信息技术有限公司 | Backlight drive circuit and backlight drive current adjustment method |
| CN113012649A (en) * | 2021-02-02 | 2021-06-22 | 深圳市江元科技(集团)有限公司 | Backlight output circuit and terminal equipment |
| WO2022188361A1 (en) * | 2021-03-12 | 2022-09-15 | 威胜集团有限公司 | Mbus host sending circuit, bus system and signal sending method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No. 16, cuixing Road, Hui Xing street, Yubei District, Chongqing Patentee after: Chongqing Lanan Technology Co.,Ltd. Address before: No. 13-2, Jiangying Road, Nanan District, Chongqing, Chongqing Patentee before: CHONGQING BLUEBANK COMMUNICATION TECHNOLOGY Co.,Ltd. |