CN202077124U - Television and standby control circuit thereof - Google Patents

Abstract

The utility model is applicable to the field of television, and provides a standby control circuit of the television and the television. The circuit includes: a main board that is powered on in the power-on state and powered off in the standby state; The touch chip that receives the standby signal sent by the main board in the standby state and receives the power-on signal in the standby state; and is connected to the touch chip and the main board respectively, supplies power for the touch chip and controls the touch chip according to the control signal sent by the touch chip. The motherboard implements an AC/DC power supply that powers on or off. The utility model uses the touch chip for standby management, and the touch chip controls the AC/DC power supply to interrupt the power supply to the main board according to the standby signal, and can control the standby current of the whole machine to below 10 mA, and the standby power consumption can reach 0.1-0.3w . This standby circuit does not require any modification to the AC/DC power supply, does not require any additional components, and therefore does not add any system cost.

Description

A TV standby control circuit and the TV

technical field

The utility model belongs to the field of televisions, in particular to a standby control circuit of a television and the television.

Background technique

The state requires that since January 1, 2012, the passive standby power of flat-panel TVs should be less than 0.5w. The current flat-panel TVs all convert 220v alternating current to VCC (5v or 3.3v, 12v, 24v, etc.) DC power supply by the internal AC/DC power supply for use by the TV. Among them, VCC exists both during startup and standby. In order to achieve a standby power consumption of less than 0.5w, the standby current is usually required to be less than 30mA. If the power supply efficiency is low, the standby current will be required to be smaller. With the development of the TV field, the SOC function of the TV motherboard is becoming more and more complex, the main frequency of the CPU is also high, and the corresponding standby current is also large. It is very difficult to take any measures, and the standby power is less than 0.5w. At present, the following methods are mainly used to reduce the standby power:

(1) Add an additional standby CPU, turn off the power supply of the main board and other parts during standby, the standby CPU can receive infrared remote control and key control signals to wake up the TV, and its own working current is less than 5 mA;

(2) A standby CPU is integrated inside the mainboard SOC to achieve low standby current;

(3) If the AC/DC power supply board is changed and other parts other than the standby circuit are completely cut off, it is usually necessary to add a relay. In this case, the motherboard current can relax the limit of VCC by about 10 mA.

The above three methods have their own defects. Method (1) needs to increase the complexity of the circuit and also increase additional costs; method (2) will increase the difficulty and cost of chip design, and is not applicable to existing chips; method (3) There is little room for improvement, and the system cost needs to be increased simultaneously.

Utility model content

The purpose of the utility model is to provide a standby circuit of a TV set, aiming at solving the problems of complicated wiring and high cost of the traditional standby circuit.

The utility model is realized in this way, a kind of standby control circuit of TV set, comprises:

Motherboards that are powered on in the boot state and powered off in the standby state;

A touch chip that is connected to the main board, receives the standby signal sent by the main board in the power-on state, and receives the power-on signal in the standby state; and

The AC/DC power supply is respectively connected to the touch chip and the main board, supplies power to the touch chip and implements power supply or power-off to the main board according to the control signal sent by the touch chip.

As the preferred technical solution of the utility model:

The main board is provided with a first remote control signal input interface capable of receiving standby commands; the main board is connected to the remote control receiving board of the TV through the first remote control signal input interface.

The touch chip is provided with an input interface capable of receiving a standby signal sent by the main board, and an output interface for sending a keying signal to the main board.

The touch chip is provided with a second remote control signal input interface capable of receiving a power-on signal; the touch chip is connected to the remote control receiving board of the TV through the second remote control signal input interface.

The touch chip is provided with a key control signal input interface capable of receiving a power-on signal; the touch chip is connected to the key control panel of the TV through the key control signal input interface.

The inside of the touch chip has a memory for saving the state before the TV is switched off.

The touch chip is connected to the control signal input interface of the AC/DC power supply through the control signal output interface.

Another object of the present invention is to provide a TV set, which has the above-mentioned standby control circuit.

The utility model uses the touch chip for standby management. When starting up, the touch chip only performs the function of touching buttons, and when it is in standby, it sends a standby signal to the touch chip through the main board, and the touch chip controls the AC/DC power supply to interrupt the power supply according to the standby signal. The power supply of the main board makes it possible to control the standby current of the whole machine to less than 10mA in the standby state, and the standby power consumption can be 0.1-0.3w, and it is easy to achieve the standby power consumption of less than 0.5w requirements. This standby circuit does not require any modification to the AC/DC power supply, does not require any additional components, and therefore does not add any system cost. At the same time, the standby circuit has good adaptability, does not have any limitation on the standby current of the motherboard, and is very practical.

Description of drawings

Fig. 1 is a schematic circuit structure diagram of a standby control circuit provided by an embodiment of the present invention;

Fig. 2 is a working flowchart of the standby control circuit provided by the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model provides a standby control circuit of a television, comprising:

Motherboards that are powered on in the boot state and powered off in the standby state;

A touch chip that is connected to the main board, receives the standby signal sent by the main board in the power-on state, and receives the power-on signal in the standby state; and

An AC/DC power supply that is connected to the touch chip and the main board to supply power to the touch chip and implement power supply or power off to the main board according to the control signal sent by the touch chip.

The utility model also provides a TV set, which has the above standby control circuit.

The utility model uses the touch chip for standby management, sends a standby signal to the touch chip through the main board, and the touch chip controls the AC/DC power supply to interrupt the power supply to the main board according to the standby signal, so that only the touch chip consumes power in the standby state, realizing The standby power consumption is less than the requirement of 0.5w. And the circuit does not need to add any additional devices, and does not increase any system cost.

The specific implementation of the standby control circuit of the TV set of the present invention is described in detail below in conjunction with specific embodiments:

Fig. 1 shows the schematic diagram of the circuit structure of the standby control circuit provided by the embodiment of the utility model, and Fig. 2 shows the working flow diagram of the standby control circuit provided by the embodiment of the utility model. Example related part.

Referring to FIG. 1 , the standby control circuit provided by this embodiment mainly includes a main board 1 of a TV set, a touch chip 2 , and an AC/DC power supply 3 . Wherein, the touch chip 2 controls the AC/DC power supply 3 to power on or off the motherboard 1 . If standby is required in the power-on state, the mainboard 1 will send a standby signal to the touch chip 2, and the touch chip 2 controls the AC/DC power supply 3 to stop supplying power to the mainboard 1, and the TV enters the standby state. If it needs to be turned on in the standby state, touch The chip 2 receives a button or a remote control start signal, and controls the AC/DC power supply 3 to start supplying power to the motherboard 1, so that the TV enters the start state. In this circuit, the main board 1 can have multiple signal input and output interfaces, including the first remote control signal input interface connected to the remote control receiving board 4, which can receive the remote control standby signal sent by the remote control receiving board 4, and the first remote control signal input interface to the touch chip 2. An output interface for sending standby signals, an input interface for receiving various keying information sent by the touch chip 2 , and a voltage input interface connected to a voltage output interface of the AC/DC power supply 3 .

Touch chip 2 has the input interface that can receive standby signal, and this input interface is connected with the output interface that is used to send standby signal to touch chip 2 on main board 1; The keying signal input interface of various keying signals (including power-on signal) and the output interface for sending the received keying signal to the main board 1 after corresponding processing; the touch chip 2 also has a corresponding The second remote control signal input interface connected to receive the remote start signal sent by the remote control receiving board 4 also has a voltage input interface connected to a voltage output interface of the AC/DC power supply 3 . Moreover, the touch chip 2 is also connected to the control signal input interface of the AC/DC power supply 3 through its control signal output interface, so as to control whether the AC/DC power supply 3 powers on the motherboard 1 .

In this embodiment, the touch chip 2 is preferably MCU type, which can receive infrared remote control and key control signals, so as to ensure that the TV can be turned on during standby. Moreover, the touch chip 2 has a memory inside and has a small amount of EEPROM space. , can save the state of the TV before AC shutdown, that is, the power-on state or the standby state.

With reference to accompanying drawing 2, the operating principle of the standby control circuit that the present embodiment provides is as follows:

After the TV is powered on, the touch chip 2 is initialized. This process generally takes 100-200 milliseconds. During this process, the touch chip 2 sends a low-level control signal to the AC/DC power supply 3 and does not supply power to the main board 1. . Then the touch chip 2 will detect its own internal memory, read the state before the last AC shutdown of the TV, and see whether it is AC shutdown in standby mode or AC shutdown in boot status, there are two situations:

Case 1: It was in the power-on state before the last AC power-off.

In the first step, the touch chip 2 sends a high-level control signal to the AC/DC power supply 3 to control the AC/DC power supply 3 to supply power to the main board 1, and the main board 1 starts to work normally. Then the memory saves the power-on state.

In the second step, the touch chip 2 starts to monitor the signal sent by the main board 1 . When the TV is turned on normally, the motherboard 1 sends a high-level signal to the touch chip 2; when the user requests standby or scheduled shutdown through the remote control or button operation, the motherboard 1 sends a low-level signal to the touch chip 2 after completing the preparations before standby. A flat standby signal. After the touch chip 2 detects the standby signal, it sends a low-level control signal to the AC/DC power supply 3 to control the AC/DC power supply 3 to stop supplying power to the motherboard 1 . At the same time, the memory saves the standby state, and the TV enters the standby state.

In the third step, the touch chip 2 detects whether there is a keying or remote start signal, and if not, continues to detect. If a power-on signal is received, a high-level control signal is sent to the AC/DC power supply 3 to control the AC/DC power supply 3 to supply power to the mainboard 1 . The memory saves the power-on state to complete a process.

The second case: before the last AC shutdown, it was in standby mode.

First, the touch chip 2 keeps sending a low-level control signal to the AC/DC power supply 3 and does not supply power to the main board 1 .

Then, the touch chip 2 detects whether there is a keying or remote start signal. Once the power-on signal is received, a high-level control signal is sent to the AC/DC power supply 3 to control the AC/DC power supply 3 to supply power to the mainboard 1, and the memory stores the power-on state.

Then, the touch chip 2 continues to operate according to the procedures of the second step and the third step in the above first case.

The utility model uses the touch chip for standby management, sends a standby signal to the touch chip through the main board, and the touch chip controls the AC/DC power supply to interrupt the power supply to the main board according to the standby signal, so that only the touch chip consumes power in the standby state, realizing The standby power consumption is less than the requirement of 0.5w. And the circuit does not need to add any additional devices, and does not increase any system cost. At the same time, the standby circuit has good adaptability, does not have any limitation on the standby current of the motherboard, and is very practical.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (8)

1. A standby control circuit of a television set, characterized in that said circuit comprises: Motherboards that are powered on in the boot state and powered off in the standby state; A touch chip that is connected to the main board, receives the standby signal sent by the main board in the power-on state, and receives the power-on signal in the standby state; and The AC/DC power supply is respectively connected to the touch chip and the main board, supplies power to the touch chip and implements power supply or power-off to the main board according to the control signal sent by the touch chip. 2. The circuit according to claim 1, wherein the main board is provided with a first remote control signal input interface capable of receiving standby commands; boards are connected. 3. The circuit according to claim 1, wherein the touch chip is provided with an input interface capable of receiving a standby signal sent by the main board, and an output interface sending a keying signal to the main board. 4. The circuit according to claim 1, wherein the touch chip is provided with a second remote control signal input interface capable of receiving a power-on signal; boards are connected. 5. The circuit according to claim 1, wherein the touch chip is provided with a key signal input interface capable of receiving a power-on signal; the touch chip communicates with the key control panel of the TV through the key signal input interface. connect. 6 . The circuit according to claim 1 , wherein the touch chip has a memory for saving the state before the TV is switched off by AC. 7 . 7. The circuit according to claim 1, wherein the touch chip is connected to a control signal input interface of the AC/DC power supply through a control signal output interface. 8. A television set, characterized by having the standby control circuit according to any one of claims 1 to 7.

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