CN211507080U

CN211507080U - Circuit for controlling backlight driving time sequence of LED television

Info

Publication number: CN211507080U
Application number: CN202020333342.6U
Authority: CN
Inventors: 王宏; 苏瑞; 范欣
Original assignee: Sichuan Changhong Precision Electronic Technology Co ltd; Sichan Ai Chance Technology Co ltd
Current assignee: Sichuan Changhong Precision Electronic Technology Co ltd; Sichan Ai Chance Technology Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-09-15
Anticipated expiration: 2030-03-17

Abstract

The utility model relates to a LED (light Emitting diode) drive control technical field that is shaded, concretely relates to a circuit for controlling LED TV drive chronogenesis that is shaded has realized just can normally opening LED under specific drive chronogenesis and is shaded, has avoided leading to LED backlight can not normally work because of the OCP mistake protection that signal drive chronogenesis problem appears, has improved the stability of product, has brought positive experience for the user. The technical scheme includes that the circuit for controlling the backlight driving time sequence of the LED television comprises a backlight signal control circuit unit, a power supply control circuit unit and a driving control chip, wherein the backlight signal control circuit unit is connected with the power signal control circuit unit, the power supply control circuit unit is connected with the backlight signal control circuit unit, and the driving control chip is connected with the power supply control circuit unit. The circuit is suitable for controlling the backlight driving time sequence of the LED television.

Description

Circuit for controlling backlight driving time sequence of LED television

Technical Field

The utility model relates to a LED (light Emitting diode) drive control technical field that is shaded, concretely relates to circuit for controlling LED TV drive chronogenesis that is shaded.

Background

With the increase of consumption level and the transformation of aesthetic sense of consumers, various intelligent household appliances have entered into thousands of households. The LED television is still listed as the first intelligent household appliance as an audio and video medium. The luminous source (LED backlight) of the LED television is an LED lamp bead string. Hardware circuit workers enable two ends of the lamp bead string to reach the driving voltage of the lamp bead string through different circuit architectures, and the lamp bead is enabled to emit light.

The LED backlight driving is generally controlled by an IC (integrated circuit) chip, and the IC control signal is generally composed of a BL-ON (backlight ON/off control signal) and a DIM (backlight pulse modulation control signal) from a motherboard. BL-ON is the backlight driving signal and DIM is the backlight dimming signal. For LED television, a PS-ON signal (power control signal) is indispensable. For a television with input power less than or equal to 75W, a PFC (Power Factor correction) circuit is not provided, and the PS-ON signal only controls standby and starting; for a television with input power of more than or equal to 75W, a PFC circuit is provided, and the PS-ON signal not only needs to control standby and startup, but also needs to control the PFC circuit. When the PS-ON signal is at a high level, the PFC circuit works, and when the PS-ON signal is at a low level, the PFC circuit does not work. For a television with the input power being more than or equal to 75W, if the PFC circuit does not work, when the AC input low voltage (100Vac), BL-ON and DIM are set at high level to drive the LED backlight, the LED backlight part can generate OCP (over currentprotection) error protection.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a circuit for controlling LED TV drive chronogenesis that is shaded from sun has realized just can normally opening LED under specific drive chronogenesis and is shaded from sun, has avoided leading to LED to be shaded from sun normal work because the OCP mistake protection that signal drive chronogenesis problem appears, has improved the stability of product, has brought positive experience for the user.

The utility model discloses take following technical scheme to realize above-mentioned mesh for control LED TV is shaded and drives the circuit of chronogenesis, including signal control circuit unit, power supply control circuit unit and drive control chip in a poor light, signal control circuit unit and power signal control circuit unit connection in a poor light, power supply control circuit unit and signal control circuit unit connection in a poor light, drive control chip and power supply control circuit unit connection in a poor light.

Further, in order to optimize the switch control circuit unit, the switch control circuit unit includes electrical signal end, resistance one, resistance two, resistance three, electric capacity one and PNP triode, the one end and the electrical signal end of resistance one are connected, the other end of resistance one is connected with the base of PNP triode, the collecting electrode ground connection of PNP triode, the projecting pole is connected with the one end of resistance three, the other end and the signal control circuit unit that is shaded of resistance three are connected, the other end of resistance one still is connected with the one end of resistance two, the other end and the common ground connection of PNP triode collecting electrode of resistance two, the other end of resistance one still is connected with the one end of electric capacity one, the other end and the common ground connection of PNP triode collecting electrode of electric capacity one.

Further, in order to optimize the backlight switch control circuit unit, the backlight signal control circuit unit comprises a backlight signal end, a resistor four, a resistor five, a resistor six, a capacitor two and an MOS (metal oxide semiconductor) tube, one end of the resistor four is connected with the backlight signal end, the other end of the resistor four is connected with one end of the resistor five, the other end of the resistor five is connected with a grid electrode of the MOS tube, a source electrode of the MOS tube is grounded, a drain electrode of the MOS tube is connected with the power supply control circuit unit, the other end of the resistor four is further connected with a resistor three of the power supply signal control circuit unit, the other end of the resistor five is further connected with one end of the resistor six, the other end of the resistor six is commonly grounded with the source electrode of the MOS tube, the other end of the resistor five is further connected with one end of the.

Furthermore, in order to optimize the power supply control circuit unit, the power supply control circuit unit comprises a power supply end, a resistor seven, a resistor eight, a resistor nine, a capacitor three, a capacitor four and a PNP triode, one end of the resistor seven is connected with a drain electrode of an MOS tube of the backlight signal control circuit unit, the other end of the resistor seven is connected with a base electrode of a PNP triode, an emitting electrode of the PNP triode is connected with a power supply end, a collecting electrode is connected with one end of the resistor nine, the other end of the resistor nine is connected with a VCC pin of the drive control chip, the other end of the resistor seven is further connected with one end of the resistor eight, the other end of the resistor eight is connected with the power supply end, the other end of the resistor nine is further connected with an anode of the capacitor three, a cathode of the capacitor three is grounded, the other end of the resistor nine is further connected with one end of the capacitor four, the other end of the capacitor four is grounded with a cathode of the capacitor three, and.

Further, in order to reduce interference on signals, the MOS transistor is a DMN601K patch MOS transistor.

Furthermore, in order to improve the stability of the circuit, the driving control chip is a PF7001 chip.

Further, in order to reduce power consumption, the PNP triode is an MMBT4403 patch triode.

The beneficial effects of the utility model are that, realized just can normally open LED under specific drive chronogenesis and be shaded, avoided leading to LED to be shaded because the mistake protection that signal drive chronogenesis problem appears can normally open, improved the stability of product, brought positive experience for the user.

Drawings

Fig. 1 is a block diagram of the circuit structure of the present invention.

Fig. 2 is a schematic circuit diagram according to an embodiment of the present invention.

In the drawing, PS-ON is a Power supply signal terminal, BL-ON is a backlight signal terminal, DIM is a backlight pulse control signal terminal, Power is a Power supply terminal, R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, R5 is a fifth resistor, R6 is a sixth resistor, R7 is a seventh resistor, R8 is an eighth resistor, R9 is a ninth resistor, R10 is a tenth resistor, C1 is a first capacitor, C2 is a second capacitor, C3 is a third capacitor, C4 is a fourth capacitor, Q1 is a PNP triode, Q2 is an N-channel MOS transistor, Q3 is a PNP triode, U1-SET 7001 is a driving control chip, PF 1 is an EN pin of PF 1, 2 is a DIM pin of PF7001, 3 is a pin of PF7001, 4 is an FB pin of PF7001, 5 is a PF7001 pin of PF7001, PF 6 is a VCC pin of VCC 7001, PF 7008 is a PF7001 pin of PF7001, PF 7008 pin of PF7001 is a PF7001 pin of PF7001, PF 70010 is a PF7001 pin of a GND is a GND pin of PF 70011, PF7001 is a PF7001 pin of a PF 70010, 12 is VBJT pin of PF7001, 13 is VADJ pin of PF7001, and 14 is SLP pin of PF 7001.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

The utility model is used for control LED TV drive time sequence's circuit in a poor light, its circuit structure block diagram is as shown in fig. 1, including signal control circuit unit, power supply control circuit unit and drive control chip in a poor light, signal control circuit unit and power signal control circuit unit connection in a poor light, power supply control circuit unit and signal control circuit unit connection in a poor light, drive control chip and power supply control circuit unit connection in a poor light.

The power signal control circuit unit includes the signal terminal, resistance one, resistance two, resistance three, electric capacity one and PNP triode, the one end and the signal terminal of resistance one are connected, the other end and the base of PNP triode of resistance one are connected, the collecting electrode ground connection of PNP triode, the projecting pole is connected with the one end of resistance three, the other end and the signal control circuit unit connection that is shaded of resistance three, the other end of resistance one still is connected with the one end of resistance two, the other end and the common ground connection of PNP triode collecting electrode of resistance two, the other end of resistance one still is connected with the one end of electric capacity one, the other end and the common ground connection of PNP triode collecting electrode of electric capacity one.

The backlight signal control circuit unit comprises a backlight signal end, a resistor IV, a resistor V, a resistor VI, a capacitor II and an MOS (metal oxide semiconductor) tube, wherein one end of the resistor IV is connected with the backlight signal end, the other end of the resistor IV is connected with one end of the resistor V, the other end of the resistor V is connected with a grid electrode of the MOS tube, a source electrode of the MOS tube is grounded, a drain electrode of the MOS tube is connected with the power supply control circuit unit, the other end of the resistor IV is further connected with a resistor III of the power supply signal control circuit unit, the other end of the resistor V is further connected with one end of the resistor VI, the other end of the resistor VI is grounded with the source electrode of the MOS tube, the other end of the resistor V is further connected with one end of.

The power supply control circuit unit comprises a power supply end, a resistor seven, a resistor eight, a resistor nine, a capacitor three, a capacitor four and a PNP triode, one end of the resistor seven is connected with a drain electrode of an MOS (metal oxide semiconductor) tube of the backlight signal control circuit unit, the other end of the resistor seven is connected with a base electrode of the PNP triode, an emitting electrode of the PNP triode is connected with the power supply end, a collecting electrode is connected with one end of the resistor nine, the other end of the resistor nine is connected with a VCC (voltage converter) pin of the drive control chip, the other end of the resistor seven is further connected with one end of the resistor eight, the other end of the resistor eight is connected with the power supply end, the other end of the resistor nine is further connected with an anode of the capacitor three, a cathode of the capacitor three is grounded, the other end of the resistor nine is further connected with one end of the capacitor.

The MOS tube is a DMN601K patch MOS tube, and can reduce interference on signals.

The driving control chip is PF7001, which can improve the circuit stability.

The PNP triode is an MMBT4403 patch triode and can reduce power.

Examples

The circuit schematic diagram of the embodiment is shown in fig. 2, and includes a POWER signal terminal PS-ON, a backlight signal terminal BL-ON, a POWER supply terminal POWER, a backlight pulse regulation signal terminal DIM, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a PNP triode Q1, an N-channel MOS Q2, a PNP triode Q3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a driving control chip PF 7001. One end of the first resistor R1 is connected with a power signal end PS-ON, the other end of the first resistor R1 is connected with a base electrode of a PNP triode Q1, a collector electrode of the PNP triode Q1 is grounded, an emitter electrode of the PNP triode Q1 is connected with one end of a resistor three R3, the other end of the first resistor R1 is also connected with one end of a resistor two R2, the other end of the resistor two R2 is commonly grounded with a collector electrode of the PNP triode Q1, the other end of the first resistor R1 is also connected with one end of a capacitor one C1, the other end of the capacitor one C1 is commonly grounded with a collector electrode of the PNP triode Q1, the other end of the resistor three R3 is connected with one end of a resistor four R4, the other end of the resistor four R4 is connected with a backlight signal control end BL-ON, one end of the resistor four R4 is also connected with one end of a resistor five R5, the other end of the resistor five R5 is connected with a gate of an, the other end of the resistor five R5 is further connected with one end of a resistor six R6, the other end of the resistor six R6 is commonly grounded with the source of an N-channel MOS tube Q2, the other end of the resistor five R5 is further connected with one end of a capacitor two C2, the other end of the capacitor two C2 is commonly grounded with the source of an N-channel MOS tube Q2, the other end of the resistor seven R7 is connected with the base of a PNP triode Q3, the emitter of the PNP triode Q3 is connected with the POWER supply end, the collector is connected with one end of a resistor nine R9, the other end of the resistor nine R9 is connected with the VCC pin of the driving control chip PF7001, the other end of the resistor seven R7 is further connected with one end of a resistor eight R8, the other end of the resistor eight R8 is connected with the POWER supply voltage end POR, the other end of the resistor nine R9 is further connected with the positive electrode of a capacitor three C3, the negative electrode of the capacitor three C3 is grounded, the other end of the resistor nine R9 is further connected with one end of, the GND pin of the driving control chip PF7001 and the cathode of the capacitor tri-C3 are grounded together, the backlight pulse regulation signal end DIM is connected with one end of a resistor decaR 10, and the other end of the resistor decaR 10 is connected with the DIM pin of the driving control chip PF 7001.

In this embodiment, a resistor of 3.6 kilo-ohm is used for R1, a resistor of 3.9 kilo-ohm is used for R2, a resistor of 150 kilo-ohm is used for R3, a resistor of 1.5 kilo-ohm is used for R4, a resistor of 100 ohms is used for R5, a resistor of 7.5 kilo-ohm is used for R6, a resistor of 22 kilo-ohm is used for R7 with accuracy of ± 1%, a resistor of 10 kilo-ohm is used for R8, a resistor of 10 ohms is used for R9, a resistor of 100 ohms is used for R10, a capacitor of 100nF is used for C1, a capacitor of 100nF25V is used for C2, a capacitor of 22uF50V, a capacitor of 100nF25V is used for C8, a PNP transistor of MMBT4403 is used for Q1, a MOS transistor of Q2N is used for DMN K, a PNP transistor of Q3 is used for PNP 36601, and a PNP resistor of pbv 1 is used for driving a power supply voltage control chip of mmpnp 3612.

The utility model discloses a principle is, only when PS-ON is the high level, BL-ON is when the high level, Q1 ends, Q2 switches ON, Q2 switches ON afterwards, Q3's base is drawn low, consequently Q3 can switch ON, Q3 switches ON afterwards, supply voltage just can provide the power for drive control chip, DIM input high level signal, drive control chip just can drive normally opening in a poor light, the OCP mistake protection of having avoided appearing because of the problem of signal drive chronogenesis has improved the stability of product, the user has brought actively experience.

Claims

1. A circuit for controlling LED TV is shaded and is driven chronogenesis, its characterized in that: the backlight control circuit unit is connected with the power signal control circuit unit, the power supply control circuit unit is connected with the backlight signal control circuit unit, and the driving control chip is connected with the power supply control circuit unit.

2. The circuit for controlling the timing of LED television backlight driving according to claim 1, wherein: the utility model discloses a circuit, including power signal control circuit unit, resistance one, resistance two, resistance three, electric capacity one and PNP triode, the one end and the power signal end of resistance one are connected, the other end of resistance one is connected with the base of PNP triode, the collecting electrode ground connection of PNP triode, the projecting pole is connected with the one end of resistance three, the other end and the signal control circuit unit connection that is shaded of resistance three, the other end of resistance one still is connected with the one end of resistance two, the other end and the common ground connection of PNP triode collecting electrode of resistance two, the other end of resistance one still is connected with the one end of electric capacity one, the other end and the common ground connection of PNP triode collecting electrode of electric capacity.

3. The circuit for controlling the timing of LED television backlight driving according to claim 2, wherein: the backlight signal control circuit unit comprises a backlight signal end, a resistor IV, a resistor V, a resistor VI, a capacitor II and an MOS (metal oxide semiconductor) tube, wherein one end of the resistor IV is connected with the backlight signal end, the other end of the resistor IV is connected with one end of the resistor V, the other end of the resistor V is connected with a grid electrode of the MOS tube, a source electrode of the MOS tube is grounded, a drain electrode of the MOS tube is connected with the power supply control circuit unit, the other end of the resistor IV is further connected with a resistor III of the power supply signal control circuit unit, the other end of the resistor V is further connected with one end of the resistor VI, the other end of the resistor VI is grounded with a source electrode of the MOS tube, the other end of the resistor V is further connected with one end of the.

4. The circuit for controlling the backlight driving timing of an LED television according to claim 3, wherein: the power supply control circuit unit comprises a power supply end, a resistor seven, a resistor eight, a resistor nine, a capacitor three, a capacitor four and a PNP triode, one end of the resistor seven is connected with a drain electrode of an MOS (metal oxide semiconductor) tube of the backlight signal control circuit unit, the other end of the resistor seven is connected with a base electrode of the PNP triode, an emitting electrode of the PNP triode is connected with the power supply end, a collecting electrode is connected with one end of the resistor nine, the other end of the resistor nine is connected with a VCC (voltage converter) pin of the drive control chip, the other end of the resistor seven is further connected with one end of the resistor eight, the other end of the resistor eight is connected with the power supply end, the other end of the resistor nine is further connected with an anode of the capacitor three, a cathode of the capacitor three is grounded, the other end of the resistor nine is further connected with one end of the capacitor four.

5. The circuit for controlling the driving timing of an LED television backlight according to claim 3 or 4, wherein: the MOS tube is a DMN601K patch MOS tube.

6. The circuit for controlling the driving timing of an LED television backlight according to claim 1 or 4, wherein: the driving control chip is a PF7001 chip.

7. The circuit for controlling the driving timing of an LED television backlight according to claim 2 or 4, wherein: the PNP triode is an MMBT4403 patch triode.