CN217157675U - Universal LED drive circuit of liquid crystal screen - Google Patents

Universal LED drive circuit of liquid crystal screen Download PDF

Info

Publication number
CN217157675U
CN217157675U CN202123082394.4U CN202123082394U CN217157675U CN 217157675 U CN217157675 U CN 217157675U CN 202123082394 U CN202123082394 U CN 202123082394U CN 217157675 U CN217157675 U CN 217157675U
Authority
CN
China
Prior art keywords
circuit
sub
voltage
boost
liquid crystal
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.)
Active
Application number
CN202123082394.4U
Other languages
Chinese (zh)
Inventor
王洪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING DWIN TECHNOLOGY CO LTD
Original Assignee
BEIJING DWIN TECHNOLOGY CO LTD
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BEIJING DWIN TECHNOLOGY CO LTD filed Critical BEIJING DWIN TECHNOLOGY CO LTD
Priority to CN202123082394.4U priority Critical patent/CN217157675U/en
Application granted granted Critical
Publication of CN217157675U publication Critical patent/CN217157675U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Liquid Crystal Display Device Control (AREA)

Abstract

The utility model relates to a general LED drive circuit of LCD screen, including boost sub-circuit, RC absorb sub-circuit, boost filter sub-circuit, boost protection sub-circuit, FB voltage filter sub-circuit and feedback sub-circuit; the booster sub-circuit is provided with a voltage input end, a grounding end, a pulse absorption end and a voltage output end; the voltage input end of the boost sub-circuit is connected with a voltage VCC, the grounding end of the boost sub-circuit is grounded, the pulse absorption end of the boost sub-circuit is grounded through an RC absorption sub-circuit, the voltage output end of the boost sub-circuit is grounded through a boost filter sub-circuit, the voltage output end of the boost sub-circuit is grounded through a boost protection sub-circuit and a feedback sub-circuit in sequence, and the boost protection sub-circuit is grounded through an FB voltage filter sub-circuit; and two ends of an LED of the liquid crystal screen are respectively connected to the voltage output end of the boost sub-circuit and the boost protection sub-circuit. The utility model discloses simple structure, low cost, reliability are high and the superior performance, improve the liquid crystal display effect.

Description

Universal LED drive circuit of liquid crystal screen
Technical Field
The utility model relates to a drive circuit, concretely relates to general LED drive circuit of LCD screen.
Background
Most of the liquid crystal display devices in the existing market are backlight liquid crystal display devices, which include a liquid crystal panel and a backlight module. The liquid crystal panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, a plurality of vertical and horizontal fine electric wires are arranged between the two glass substrates, the liquid crystal molecules are controlled to change directions by electrifying or not, and light rays of the backlight module are refracted out to generate pictures. Since the lcd panel does not emit light, the backlight module is one of the key components of the lcd device because the backlight module needs to provide a light source to normally display images. In the backlight module, an LED lamp and an LED drive circuit are basic components; the LED lamp number and the drive quantity in the unit area are more, and different drive voltages are possibly adopted for different color lamp beads of the LEDs, so that the LED lamps can generate voltage drop in the actual working process, the LED performance is unstable, meanwhile, in order to guarantee constant current, a constant current circuit is additionally added, the LED drive circuit structure is complex and high in cost, and meanwhile, the liquid crystal display quality can be reduced due to the unstable performance of the LED drive circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a general LED drive circuit of LCD screen is provided, its simple structure, low cost, assurance constant current that steps up improve the liquid crystal display effect.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a general LED drive circuit of a liquid crystal display comprises a boosting sub-circuit, an RC absorption sub-circuit, a boosting filter sub-circuit, a boosting protection sub-circuit, an FB voltage filter sub-circuit and a feedback sub-circuit; the booster sub-circuit is provided with a voltage input end, a grounding end, a pulse absorption end and a voltage output end; the voltage input end of the boosting sub-circuit is connected with a voltage VCC, the grounding end of the boosting sub-circuit is grounded, the pulse absorption end of the boosting sub-circuit is grounded through the RC absorption sub-circuit, the voltage output end of the boosting sub-circuit is grounded through the boosting filter sub-circuit, the voltage output end of the boosting sub-circuit is grounded through the boosting protection sub-circuit and the feedback sub-circuit in sequence, and the boosting protection sub-circuit is grounded through the FB voltage filter sub-circuit; and two ends of an LED of the liquid crystal screen are respectively connected to the voltage output end of the boosting sub-circuit and the boosting protection sub-circuit.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the boost sub-circuit comprises an inductor L1, a MOS transistor Q1 and a diode D1; inductor L1's one end does voltage input end connects in parallel voltage VCC, inductor L1's the other end respectively with diode D1's positive pole and MOS pipe Q1's drain connection, diode D1's negative pole does boost sub-circuit's voltage output end, MOS pipe Q1's source does boost sub-circuit's earthing terminal and ground connection.
Further, a PWM signal input terminal for receiving a PWM signal is further disposed on the boost sub-circuit, a gate of the MOS transistor Q1 is the PWM signal input terminal of the boost sub-circuit, and a gate of the MOS transistor Q1 is grounded through a resistor R1.
Further, the MOS transistor Q1 is specifically an N-MOS transistor, and a drain of the MOS transistor Q1 is a pulse absorption end of the boost sub-circuit;
the beneficial effect of adopting the steps is that: the PWM technology of the MOS tube is adopted as the booster circuit, so that a large amount of current power consumption is saved, the heat productivity of the whole circuit is reduced, the booster circuit is easier to drive, and the booster circuit is small in size and easier to integrate.
Further, the RC absorption sub-circuit comprises a capacitor C1 and a resistor R2, one end of the capacitor C1 is connected to the drain of the MOS transistor Q1, and the other end of the capacitor C1 is grounded through the resistor R2.
The beneficial effect of adopting the steps is that: the device is used for generating damping and absorbing the resonance energy of the output voltage spike of the MOS tube.
Further, the boost filter sub-circuit comprises a capacitor C2 and a capacitor C3, one end of the capacitor C2 and one end of the capacitor C3 are both connected to the negative electrode of the diode D1, and the other end of the capacitor C2 and the other end of the capacitor C3 are both grounded.
The beneficial effect of adopting the steps is that: the AC component in the output voltage is reduced, and the ripple factor of the whole output voltage is reduced.
Further, the boost protection sub-circuit comprises a voltage regulator tube Z1 and a resistor R3; the negative electrode of the voltage-stabilizing tube Z1 is connected to the negative electrode of the diode D1, the positive electrode of the voltage-stabilizing tube Z1 is connected to the negative electrode of the LED of the liquid crystal screen through the resistor R3, and the positive electrode of the LED of the liquid crystal screen is connected to the voltage output end of the booster sub-circuit.
The beneficial effect of adopting the steps is that: and performing overvoltage protection, limiting the output voltage within an acceptable range of the LED, and breaking down the voltage regulator tube to protect a post-stage circuit when the voltage is overvoltage.
Further, the FB voltage filtering sub-circuit comprises a capacitor C4, one end of the capacitor C4 is connected to the positive electrode of the stabilivolt Z1, and the other end of the capacitor C4 is grounded; and an FB voltage signal feedback end for feeding back a voltage signal is arranged at the common connection position of the capacitor C4 and the voltage regulator tube Z1.
The beneficial effect of adopting the steps is that: and the voltage waveform is flat and stable by filtering the feedback voltage.
Further, the feedback sub-circuit comprises a resistor R4, one end of the resistor R4 is connected to one end of the resistor R3 connected with the cathode of the LED of the liquid crystal screen, and the other end of the resistor R4 is grounded.
The beneficial effect of adopting the steps is that: it is easy to adjust the driving current of the LED.
The utility model discloses a PWM's pulse width modulation and FB voltage's feedback has formed closed loop LED drive control, the utility model discloses a drive circuit of constant current that steps up is built to basic component, and its simple structure, low cost, reliability are high and the performance is superior, improve the liquid crystal display effect.
Drawings
Fig. 1 is a block diagram of an overall structure of a general LED driving circuit of a liquid crystal display of the present invention;
fig. 2 is a schematic circuit structure diagram of a general LED driving circuit of a liquid crystal display of the present invention;
fig. 3 is a specific application diagram of the general LED driving circuit of the liquid crystal display of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, a general LED driving circuit of a liquid crystal display includes a boost sub-circuit, an RC absorption sub-circuit, a boost filter sub-circuit, a boost protection sub-circuit, an FB voltage filter sub-circuit, and a feedback sub-circuit; the booster sub-circuit is provided with a voltage input end, a grounding end, a pulse absorption end and a voltage output end; the voltage input end of the boosting sub-circuit is connected with a voltage VCC, the grounding end of the boosting sub-circuit is grounded, the pulse absorption end of the boosting sub-circuit is grounded through the RC absorption sub-circuit, the voltage output end of the boosting sub-circuit is grounded through the boosting filter sub-circuit, the voltage output end of the boosting sub-circuit is grounded through the boosting protection sub-circuit and the feedback sub-circuit in sequence, and the boosting protection sub-circuit is grounded through the FB voltage filter sub-circuit; and two ends of an LED of the liquid crystal screen are respectively connected to the voltage output end of the boosting sub-circuit and the boosting protection sub-circuit.
In this specific example 1, as shown in fig. 2:
the boosting sub-circuit comprises an inductor L1, a MOS tube Q1 and a diode D1; inductor L1's one end does voltage input end connects in parallel voltage VCC, inductor L1's the other end respectively with diode D1's positive pole and MOS pipe Q1's drain connection, diode D1's negative pole does boost sub-circuit's voltage output end, MOS pipe Q1's source does boost sub-circuit's earthing terminal and ground connection.
The boost sub-circuit is further provided with a PWM signal input end used for receiving PWM signals, the grid electrode of the MOS tube Q1 is the PWM signal input end of the boost sub-circuit, and the grid electrode of the MOS tube Q1 is grounded through a resistor R1.
The MOS transistor Q1 is specifically an N-MOS transistor.
The drain electrode of the MOS tube Q1 is a pulse absorption end of the booster sub circuit; the RC absorption sub-circuit comprises a capacitor C1 and a resistor R2, one end of the capacitor C1 is connected to the drain electrode of the MOS transistor Q1, and the other end of the capacitor C1 is grounded through the resistor R2.
The boost filter sub-circuit comprises a capacitor C2 and a capacitor C3, one end of the capacitor C2 and one end of the capacitor C3 are both connected to the cathode of the diode D1, and the other end of the capacitor C2 and the other end of the capacitor C3 are both grounded.
The boost protection sub-circuit comprises a voltage regulator tube Z1 and a resistor R3; the negative electrode of the voltage-stabilizing tube Z1 is connected to the negative electrode of the diode D1, the positive electrode of the voltage-stabilizing tube Z1 is connected to the negative electrode of the LED of the liquid crystal screen through the resistor R3, and the positive electrode of the LED of the liquid crystal screen is connected to the voltage output end of the booster sub-circuit.
The FB voltage filtering sub-circuit comprises a capacitor C4, one end of the capacitor C4 is connected to the positive electrode of the voltage regulator tube Z1, and the other end of the capacitor C4 is grounded; and an FB voltage signal feedback end for feeding back a voltage signal is arranged at the common connection position of the capacitor C4 and the voltage regulator tube Z1.
The feedback sub-circuit comprises a resistor R4, one end of the resistor R4 is connected to one end of the resistor R3 connected with the cathode of the LED of the liquid crystal screen, and the other end of the resistor R4 is grounded.
The utility model adopts the most basic elements to build a boosting constant current driving circuit; the inductor L1, the MOS tube Q1 and the diode D1 form a basic booster sub-circuit; the capacitor C1 and the resistor R2 form an RC absorption sub-circuit which is used for absorbing spike pulses of a switching tube (MOS tube Q1); the capacitor C2 and the capacitor C3 form a boosting filter sub-circuit which is used as a filter circuit after boosting to enable the voltage of the filter sub-circuit to be stable; the voltage-stabilizing tube Z1 and the resistor R3 form a boosting protection sub-circuit, so that the driving circuit of the utility model can not be damaged due to overvoltage; the capacitor C4 forms an FB voltage filtering sub-circuit, which plays the role of FB voltage filtering and stabilizes the FB voltage; the resistor R4 forms a feedback sub-circuit, which is a feedback resistor for driving the LED, and the driving current of the LED can be controlled through the resistor R4; additionally, the utility model discloses a PWM's pulse width modulation and FB voltage's feedback has formed closed loop LED drive control.
In this embodiment 2, as shown in fig. 3:
LCD screen module is for LCD screen signal driving source and LCD screen LED lamp strip in a poor light to the external interface basic structure, the utility model discloses LED lamp strip in a poor light can directly connect and drive to the LCD screen.
The utility model discloses a basic elementary components builds the drive circuit of the constant current that steps up, and its simple structure, low cost, reliability are high and the superior performance improve the liquid crystal display effect.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (9)

1. The utility model provides a general LED drive circuit of LCD screen which characterized in that: the boost protection circuit comprises a boost sub-circuit, an RC absorption sub-circuit, a boost filter sub-circuit, a boost protection sub-circuit, an FB voltage filter sub-circuit and a feedback sub-circuit; the booster sub-circuit is provided with a voltage input end, a grounding end, a pulse absorption end and a voltage output end; the voltage input end of the boosting sub-circuit is connected with a voltage VCC, the grounding end of the boosting sub-circuit is grounded, the pulse absorption end of the boosting sub-circuit is grounded through the RC absorption sub-circuit, the voltage output end of the boosting sub-circuit is grounded through the boosting filter sub-circuit, the voltage output end of the boosting sub-circuit is grounded through the boosting protection sub-circuit and the feedback sub-circuit in sequence, and the boosting protection sub-circuit is grounded through the FB voltage filter sub-circuit; and two ends of an LED of the liquid crystal screen are respectively connected to the voltage output end of the boosting sub-circuit and the boosting protection sub-circuit.
2. The general LED driving circuit of the liquid crystal display panel according to claim 1, wherein: the boosting sub-circuit comprises an inductor L1, a MOS tube Q1 and a diode D1; inductor L1's one end does voltage input end connects in parallel voltage VCC, inductor L1's the other end respectively with diode D1's positive pole and MOS pipe Q1's drain connection, diode D1's negative pole does boost sub-circuit's voltage output end, MOS pipe Q1's source does boost sub-circuit's earthing terminal and ground connection.
3. The general LED driving circuit of the liquid crystal screen according to claim 2, wherein: the boost sub-circuit is also provided with a PWM signal input end for receiving PWM signals, the grid of the MOS tube Q1 is the PWM signal input end of the boost sub-circuit, and the grid of the MOS tube Q1 is grounded through a resistor R1.
4. The general LED driving circuit of the liquid crystal screen according to claim 2, wherein: the MOS transistor Q1 is specifically an N-MOS transistor.
5. The general LED driving circuit of the liquid crystal display according to any one of claims 2 to 4, wherein: the drain electrode of the MOS tube Q1 is a pulse absorption end of the booster sub circuit; the RC absorption sub-circuit comprises a capacitor C1 and a resistor R2, one end of the capacitor C1 is connected to the drain electrode of the MOS transistor Q1, and the other end of the capacitor C1 is grounded through the resistor R2.
6. The general LED driving circuit of the liquid crystal display according to any one of claims 2 to 4, wherein: the boost filter sub-circuit comprises a capacitor C2 and a capacitor C3, one end of the capacitor C2 and one end of the capacitor C3 are both connected to the cathode of the diode D1, and the other end of the capacitor C2 and the other end of the capacitor C3 are both grounded.
7. The general LED driving circuit of the liquid crystal display according to any one of claims 2 to 4, wherein: the boost protection sub-circuit comprises a voltage regulator tube Z1 and a resistor R3; the negative electrode of the voltage-stabilizing tube Z1 is connected to the negative electrode of the diode D1, the positive electrode of the voltage-stabilizing tube Z1 is connected to the negative electrode of the LED of the liquid crystal screen through the resistor R3, and the positive electrode of the LED of the liquid crystal screen is connected to the voltage output end of the booster sub-circuit.
8. The universal LED driving circuit of the liquid crystal screen according to claim 7, wherein: the FB voltage filtering sub-circuit comprises a capacitor C4, one end of the capacitor C4 is connected to the positive electrode of the voltage regulator tube Z1, and the other end of the capacitor C4 is grounded; and an FB voltage signal feedback end for feeding back a voltage signal is arranged at the common connection position of the capacitor C4 and the voltage regulator tube Z1.
9. The universal LED driving circuit of the liquid crystal screen according to claim 7, wherein: the feedback sub-circuit comprises a resistor R4, one end of the resistor R4 is connected to one end of the resistor R3 connected with the cathode of the LED of the liquid crystal screen, and the other end of the resistor R4 is grounded.
CN202123082394.4U 2021-12-09 2021-12-09 Universal LED drive circuit of liquid crystal screen Active CN217157675U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123082394.4U CN217157675U (en) 2021-12-09 2021-12-09 Universal LED drive circuit of liquid crystal screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123082394.4U CN217157675U (en) 2021-12-09 2021-12-09 Universal LED drive circuit of liquid crystal screen

Publications (1)

Publication Number Publication Date
CN217157675U true CN217157675U (en) 2022-08-09

Family

ID=82685338

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202123082394.4U Active CN217157675U (en) 2021-12-09 2021-12-09 Universal LED drive circuit of liquid crystal screen

Country Status (1)

Country Link
CN (1) CN217157675U (en)

Similar Documents

Publication Publication Date Title
CN103093729B (en) There is the backlight drive circuit of two BOOST booster circuit
CN202549254U (en) Drive circuit for high-power LED (Light Emitting Diode) backlight source
CN103150997A (en) LED (light emitting diode) backlight driving circuit
CN105592595B (en) backlight dimming circuit and liquid crystal display
CN102222490B (en) Back light source drive circuit and television
US9095024B1 (en) Backlight driving circuit and method for reducing soft-start time thereof
CN105093598B (en) Array base palte row drives short-circuit protection circuit and liquid crystal panel
CN103258515B (en) Gate drive voltage feeding mechanism, Supply Method and display device
CN109410880A (en) Display panel, drive circuit
CN202189537U (en) Boost circuit for LED backlight driving circuit
CN106572565A (en) Two-in-one power supply
CN202268156U (en) Switch control circuit for backlight
CN102262862B (en) Light source system and light emitting diode driving method for improving electrostatic discharge capacity
CN2838200Y (en) Boosting white LED drive
CN205160851U (en) Two unification powers
CN107040140A (en) A kind of AC signal generative circuit and generation method
CN104240651B (en) LED backlight and liquid crystal display for liquid crystal display
CN203136265U (en) Circuit and device for LED constant current driving
CN202210400U (en) Backlight drive circuit and liquid crystal TV set
CN217157675U (en) Universal LED drive circuit of liquid crystal screen
US20140292227A1 (en) Led backlight driving circuit and lcd device
CN105096840A (en) Backlight driving circuit, backlight driving method and display device
CN202713737U (en) LED (Light Emitting Diode) driving circuit capable of regulating current balance by negative voltage
CN208834723U (en) Multi-channel LED backlight drive circuit and LCD TV
CN201830140U (en) BOOST drive circuit, drive device and LED (light emitting diode) liquid crystal module

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant