Hardware loop for detecting and protecting abnormity of light bar of liquid crystal display television

Abstract

The utility model provides a hardware loop for detecting and protecting abnormity of a light bar of a liquid crystal display television. The hardware loop comprises a working state indication signal end of a main system, a power supply, a light bar working state indication signal end, a reset chip, an MOS (Metal Oxide Semiconductor) tube, a triode Q1 and a triode Q3, one output end of the power supply is electrically connected to a drain electrode D input end of the MOS tube, a grid electrode G input end of the MOS tube is electrically connected with a working state indication signal end of a main system, a source electrode output end of the MOS tube is connected to a collector electrode of the triode Q1, and a base electrode of the triode Q1 is electrically connected with a light bar working state indication signal end; the other output end of the power supply is electrically connected with the input end of a resistor R8, and the output end of the resistor R8 is connected to the out end of the reset chip; the third output end of the power supply is electrically connected with a resistor R7 and then is connected to the VDD end of the reset chip. The loop is free of malfunction caused by false triggering, and the working state of the loop is stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid crystal televisions, and particularly relates to a hardware circuit for detecting and protecting abnormalities of a light bar of a liquid crystal television. Background Art

[0002] Existing LCD TVs typically use the LAMP_ERROR signal fed back by the LED driver circuit to determine whether the light bar is in normal working order. Software then identifies the abnormality and initiates protection if an abnormality occurs.

[0003] Existing technology relies on the chip response of the main system, adding additional detection ports and requiring special software. In order to prevent misidentification of signals, multiple detections are used to determine whether the light strip is in an abnormal state, which prolongs the recognition time and poses certain risks. Moreover, for the self-recoverable LED drive circuit, this solution cannot automatically reset the TV and can only be manually operated to exit the protection. Summary of the Invention

[0004] Technical solution: In order to solve the above-mentioned technical problems, the utility model provides a hardware circuit for detecting and protecting abnormalities of LCD TV light strips, which specifically includes a working status indication signal terminal of the main system, a power supply, a working status indication signal terminal of the light strip, a reset chip, a MOS tube, a transistor Q1, and a transistor Q3; one output terminal of the power supply is electrically connected to the drain D input terminal of the MOS tube, the gate G input terminal of the MOS tube is electrically connected to the working status indication signal terminal of the main system, the source output terminal of the MOS tube is connected to the collector of the transistor Q1, and the base of the transistor Q1 is electrically connected to the working status indication signal terminal of the light strip; another output terminal of the power supply is electrically connected to the input terminal of the resistor R8, and the output terminal of the resistor R8 is connected to the OUT terminal of the reset chip; the third output terminal of the power supply is electrically connected to the resistor R7 and then connected to the VDD terminal of the reset chip.

[0005] As an improvement, it also includes resistors R1 and R2, one end of the resistor R1 is electrically connected to the light bar working status indication signal end, and the other end is electrically connected to the base of the transistor Q1, one end of the resistor R2 is connected to the output end of the resistor R1, and the other end is connected to the emitter of the transistor Q1, and the emitter of the transistor Q1 is grounded.

[0006] As an improvement, a resistor R3 is further included, which is connected in series between the power output terminal and the drain D of the transistor Q1.

[0007] As an improvement, it also includes a resistor R4, a resistor R5, a resistor R6, a transistor Q3, and a diode D1; one end of the resistor R4 is connected to the power supply output end, one output end is connected to the drain D input end of the MOS tube after passing through the anode and cathode of the diode D1, and the other output tube is connected to the input end of the resistor R5, one output end of the resistor R5 is connected to the base of the transistor Q3, and the other output tube is connected to the resistor R6 and then connected to the emitter of the transistor Q3 grounded; the collector of the transistor Q3 is electrically connected to the output end of the resistor R7.

[0008] As an improvement, it further includes capacitors C1 and C2, wherein the input end of capacitor C1 is electrically connected to the output end of resistor R7, the output end of capacitor C1 is electrically connected to the input end of capacitor C2, and the output end of capacitor C2 is electrically connected to the CD end of the reset chip.

[0009] As an improvement, it further includes a reset signal terminal of the main system, and the reset signal terminal of the main system is electrically connected to the OUT terminal of the reset chip.

[0010] Beneficial effects: The circuit proposed by the utility model controls the Reset signal of the main system chip through the LAMP_ERROR signal fed back by the LED drive circuit; it is completely realized through the hardware circuit that when the LAMP_ERROR is abnormal, the reset signal is immediately pulled to put the chip into a protection state, without the need for software corresponding, and the response speed is fast; when the LAMP_ERROR returns to normal, the reset signal is released and the TV can automatically recover.

[0011] In addition, the present invention does not need to add extra detection circuits / detection signals. The light bar working status indication signal LAMP_ERROR / the main system working status indication signal SOC_Status / the main system reset signal SOC_Reset are all common control / status signals on the TV motherboard.

[0012] This circuit solves the problem of lengthy software detection when a TV's light bar is abnormal. The hardware circuit quickly responds, placing the chip into protection mode. When LAMP_ERROR returns to normal, a reset signal is released, allowing the TV to automatically recover, avoiding the drawback of software protection, which prevents the TV from exiting. This circuit fully accounts for scenarios such as normal TV operation, light bar abnormality, abnormal recovery, and TV standby mode, preventing false triggering and ensuring stable circuit operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the hardware circuit of the utility model. DETAILED DESCRIPTION

[0014] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0015] See Figure 1 As shown, the hardware circuit for detecting and protecting abnormalities of the LCD TV light bar specifically includes a working status indication signal terminal SOC_Status of the main system, a power supply, a light bar working status indication signal terminal LAMP_ERROR signal, a reset chip, a MOS tube, a transistor Q1, and a transistor Q3; one output terminal of the power supply is electrically connected to the drain D input terminal of the MOS tube, the gate G input terminal of the MOS tube is electrically connected to the working status indication signal terminal of the main system, the source output terminal of the MOS tube is connected to the collector of the transistor Q1, and the base of the transistor Q1 is electrically connected to the working status indication signal terminal of the light bar; another output terminal of the power supply is electrically connected to the input terminal of the resistor R8, and the output terminal of the resistor R8 is connected to the OUT terminal of the reset chip; the third output terminal of the power supply is electrically connected to the resistor R7 and then to the VDD terminal of the reset chip.

[0016] The system further includes resistors R1 and R2. Resistor R1 has one end electrically connected to the light bar operating status indicator signal terminal and the other end electrically connected to the base of transistor Q1. Resistor R2 has one end connected to the output terminal of resistor R1 and the other end connected to the emitter of transistor Q1. The emitter of transistor Q1 is grounded. Resistor R3 is also included and connected in series between the power supply output terminal and the drain D of transistor Q1.

[0017] It also includes a resistor R4, a resistor R5, a resistor R6, a transistor Q3, and a diode D1; one end of the resistor R4 is connected to the power output end, one output end is connected to the drain D input end of the MOS tube after passing through the anode and cathode of the diode D1, and the other output tube is connected to the input end of the resistor R5. One output end of the resistor R5 is connected to the base of the transistor Q3, and the other output tube is connected to the resistor R6 and then connected to the emitter of the transistor Q3. The collector of the transistor Q3 is electrically connected to the output end of the resistor R7.

[0018] The system also includes capacitors C1 and C2. The input of capacitor C1 is electrically connected to the output of resistor R7, the output of capacitor C1 is electrically connected to the input of capacitor C2, and the output of capacitor C2 is electrically connected to the CD terminal of the reset chip. The system also includes a reset signal terminal for the main system, and the reset signal terminal SOC_Reset for the main system is electrically connected to the OUT terminal of the reset chip.

[0019] In the present invention, the LAMP_ERROR signal is connected to the reset chip of the main system chip through an inverting transistor;

[0020] 1) When LAMP_ERROR changes, the reset chip works and sends a signal to stop the main system chip;

[0021] 2) When LAMP_ERROR is normal / recovered, the reset chip is powered off and the main system chip is restarted.

[0022] Working principle:

[0023] 1) When the TV is working normally: SOC_Status is high, Q2 is turned on; LAMP_ERROR is normally low, Q1 is turned off; the detection circuit does not work, the base of Q3 is high, Q3 is turned on, and the reset chip IC1 has no power supply and does not work;

[0024] 2) When the light bar is abnormal: SOC_Status is high, Q2 is turned on; LAMP_ERROR becomes abnormally high, Q1 is turned on; the detection circuit is turned on, the base of Q3 is low, Q3 is turned off, the reset chip IC1 is powered on and outputs the SOC_Reset reset signal, causing the main system chip to stop working;

[0025] 3) When the light bar recovers from abnormality: the main system works normally, SOC_Status is high, Q2 is turned on; LAMP_ERROR is normally low, Q1 is turned off;

[0026] The detection circuit does not work, the base of Q3 is high, Q3 is turned on, the reset chip IC1 is powered off, the reset signal is low, and the main system starts working;

[0027] 4) In normal standby mode, SOC_Status is low and Q2 is off. At this time, the LAMP_ERROR signal is not detected and the circuit will not be triggered by mistake.

[0028] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A hardware circuit for detecting and protecting abnormalities in a liquid crystal television light bar, characterized by: It includes a working status indication signal terminal of the main system, a power supply, a working status indication signal terminal of the light bar, a reset chip, a MOS tube, a transistor Q1, and a transistor Q3; one output terminal of the power supply is electrically connected to the drain D input terminal of the MOS tube, the gate G input terminal of the MOS tube is electrically connected to the working status indication signal terminal of the main system, the source output terminal of the MOS tube is connected to the collector of the transistor Q1, and the base of the transistor Q1 is electrically connected to the working status indication signal terminal of the light bar; another output terminal of the power supply is electrically connected to the input terminal of the resistor R8, and the output terminal of the resistor R8 is connected to the OUT terminal of the reset chip; the third output terminal of the power supply is electrically connected to the resistor R7 and then connected to the VDD terminal of the reset chip.

2. The hardware circuit for detecting and protecting an abnormality of an LCD TV light bar according to claim 1, characterized in that: It also includes a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected to the light bar working status indication signal end, and the other end is electrically connected to the base of the transistor Q1, one end of the resistor R2 is connected to the output end of the resistor R1, and the other end is connected to the emitter of the transistor Q1, and the emitter of the transistor Q1 is grounded.

3. The hardware circuit for detecting and protecting an abnormality of an LCD TV light bar according to claim 1, characterized in that: The device further comprises a resistor R3 which is connected in series between the power output terminal and the drain D of the transistor Q1 .

4. The hardware circuit for detecting and protecting an abnormality of an LCD TV light bar according to claim 1, characterized in that: It also includes a resistor R4, a resistor R5, a resistor R6, a transistor Q3, and a diode D1; one end of the resistor R4 is connected to the power output end, one output end is connected to the drain D input end of the MOS tube after passing through the anode and cathode of the diode D1, and the other output tube is connected to the input end of the resistor R5. One output end of the resistor R5 is connected to the base of the transistor Q3, and the other output tube is connected to the resistor R6 and then connected to the emitter of the transistor Q3. The collector of the transistor Q3 is electrically connected to the output end of the resistor R7.

5. The hardware circuit for detecting and protecting abnormalities of LCD TV light bars according to claim 1, characterized in that: It also includes capacitors C1 and C2. The input end of capacitor C1 is electrically connected to the output end of resistor R7. The output end of capacitor C1 is electrically connected to the input end of capacitor C2. The output end of capacitor C2 is electrically connected to the CD end of the reset chip.

6. The hardware circuit for detecting and protecting an abnormality of a light bar on an LCD TV according to claim 1, characterized in that: It also includes a reset signal terminal of the main system, and the reset signal terminal of the main system is electrically connected to the OUT terminal of the reset chip.

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