CN201194411Y - Power-saving switch for tv set - Google Patents

Abstract

The utility model discloses a power-saving switch of a television, which comprises a power plug and an output socket, wherein a PCB circuit board is connected between the power plug and the output socket, and a lightning stroke protection circuit, a power circuit, a television current detection circuit and a television power control circuit are sequentially arranged on the circuit board; the lightning stroke protection circuit is connected with the television through the television power supply control circuit; the infrared signal receiving circuit receives a control signal of the remote controller, one end of the infrared signal receiving circuit is connected with the power supply circuit, and the other end of the infrared signal receiving circuit is connected with the television through the television current detection circuit and the television power supply control circuit; the television current detection circuit is also connected with the LED indicating circuit. The utility model discloses can make the TV set remote control cut off the TV power completely when shutting down, reach the purpose of saving the electric energy, and can automatic switch on when the remote control is started, the utility model discloses still have lightning protection circuit, can absorb high-voltage pulse current in the twinkling of an eye, guaranteed safety, prolonged the TV set life-span.

Description

TV power saving switch

technical field

The utility model relates to a switch, in particular to a power-saving switch applied to a television set.

Background technique

Ordinary TVs are in the standby state after being turned off by remote control. At this time, the switching power supply in the TV is still working, so it will consume about 15-20W of power. If the standby time is long, it will cause a great loss of power, which does not meet the energy saving requirements. ; And long-term standby will also cause a small number of components to be damaged due to high voltage, shortening the life of the TV. It is neither safe nor convenient to frequently plug and unplug the power plug and walk back and forth. People have designed various remote control circuits to solve this problem, but it is inconvenient to use because of the large size or the need to use a dedicated remote control; the device that only automatically detects the power consumption of the TV power supply to control the power on and off, cannot receive infrared remote control signals , only by automatically detecting the power consumption of the TV power supply to control the power on and off, so it can only be powered off by remote control, and can not be started by remote control.

Utility model content

The technical problem to be solved by the utility model is to provide a TV power-saving switch, which can automatically and completely cut off the TV power supply when any type of TV is turned off by remote control, so as to save electric energy, and can be automatically connected when the TV is turned on by remote control. The power supply can also be used with any type of TV remote control to remotely switch the TV.

The technical scheme of the utility model is that a TV power-saving switch includes a power plug and an output socket, and is characterized in that a PCB circuit board is connected between the power plug and the output socket, and the circuit board is sequentially provided with a lightning strike protection circuit , power circuit, TV current detection circuit, TV power control circuit; the lightning protection circuit is connected to the TV through the TV power control circuit; the infrared signal receiving circuit receives the control signal from the remote control, one end of which is connected to the power circuit, and the other One end is connected with the TV through the TV current detection circuit and the TV power supply control circuit; the TV current detection circuit is also connected with the LED indicating circuit.

The beneficial effects of the utility model compared with the prior art are:

1. The utility model can completely use the TV remote control to control the TV switch and completely cut off the TV power supply when the TV is on standby, so that people can save the inconvenience caused by plugging and unplugging the power plug and walking back and forth; and because the utility model has few components and low cost Small power, strong anti-infrared interference ability, so it is very convenient to install and use.

2. The power consumption of the power saver itself is very small, less than 1W; the power consumption is even smaller when it is in standby mode, because the relay is in a power-off state, and the circuit consumes almost no power.

3. The current detection circuit works stably and reliably, uses precision components, is not affected by temperature, and the measurement results are accurate and reliable.

4. The lightning protection circuit can absorb instantaneous high-voltage pulse current. If there is a continuous high-voltage pulse, the thermal fuse will blow, thereby protecting the TV from being damaged by lightning, ensuring safety and prolonging the life of the TV.

Description of drawings

Shown in accompanying drawing 1 is the circuit structure block diagram of the present utility model.

Shown in accompanying drawing 2 is the circuit schematic diagram of the present utility model.

Detailed ways

The input end of the utility model is connected to the mains, the output end is connected to the power plug of the TV set, and the direction of the infrared receiving sub-direction is the same as that of the TV set. The utility model is small in size and convenient to install and use.

As shown in accompanying drawing 1, it is a block diagram of the circuit structure of the present utility model. The circuit of the utility model is composed of six parts: a lightning protection circuit, a power supply circuit, a current detection circuit, an infrared signal receiving circuit, an LED indicating circuit, and a TV power supply control circuit.

Shown in accompanying drawing 2 is the circuit schematic diagram of the present utility model.

1. Lightning protection circuit, varistor RV1 adopts 10D431K, which can absorb lightning induction current up to 2500A instantaneously after the voltage exceeds 275VAC. Thermal fuse F1 adopts φ4.5*14250VAC 10A 133℃. The two stick together to ensure that the thermal fuse can be blown when the varistor absorbs too much surge current and overheats, ensuring safety.

2. Power supply circuit, transformer TR1 adopts 220VAC input and output 9V/1.1W square transformer, which has high efficiency and low power consumption. The transformer output is rectified by D4-D7 diodes to generate +12V power supply for the relay, and U2 is used to generate +5V power supply from the +12V power supply for U1 and IR1. Relay RL1 adopts 12VDC control, the control coil is high internal resistance, 10A/250VAC specification, low power consumption, and sensitive control.

3. The current detection circuit must use components that can resist the impact of high current when starting up, otherwise it is very easy to be damaged by the impact current generated by the TV deflection coil and switching power supply at the moment of starting up, resulting in detection failure and the TV cannot be turned on; The influence of temperature is small, otherwise, the detection error will be very large. Similar technologies use electric furnace wire, etc., which are greatly affected by temperature. The utility model adopts a precision pulse-resistant resistor connected in parallel with two reverse-parallel rectifier diodes for detection, which can withstand an instantaneous impact current of more than 60A without damage, and makes the circuit work stable and reliable. R1 uses a precision pulse-resistant resistor with a temperature coefficient of 50ppm of 0.33 ohm 1W. U1 op amp LM324N is used to compare voltage signal changes. All the resistors connected to U1 are precision metal film resistors with 1% error to ensure the accuracy of each reference voltage. R10, R3; R12, R13 generate a reference voltage Vref through voltage division and supply to U1 for comparison. The 4 operational amplifiers inside U1 are all used as voltage comparators. When the positive phase terminal voltage is high, the output is high level; if the negative phase terminal voltage is high, the output is low level.

4. Infrared signal receiving circuit must receive sensitive infrared signal because it needs to receive infrared remote control signal, and at the same time, it must have strong anti-interference ability. The utility model adopts the 38KHz infrared receiver TSOP1738 to receive the infrared remote control signal, and uses the current detection circuit to detect whether the TV is turned on. If it is not the turn-on signal and the TV is not turned on, the red light will indicate that after a delay of 10 seconds, The circuit is cut off again, so the circuit can overcome other infrared signal interference, and the reception is sensitive. IR1 adopts 38KHz infrared receiving sub TSOP1738 to receive infrared remote control signal. When there is no remote control signal, the output is high level, which has no effect on U1 operational amplifier LM324N. Because there is a large-scale integrated IC inside IR1, IR1 is composed of R17 and C3 to filter the power supply separately, so that IR1 works stably. When there is a remote control signal, the output is a 38KHz low-level pulse (transmission code), which makes the U1LM324N9 pin become low level, and the 8 pin becomes high level, thereby controlling the relay to be connected. Since R14 (1MΩ) and C6 (10uF) form an integral circuit, if the TV is turned on, R14 is low and does not charge C6, and the relay is always connected; if the TV is not turned on, R14 is high and charges C6, 10 Seconds later, the U18 pin will become low level again, thus cutting off the relay.

5. The LED indicator circuit is indicated by a red LED. When the red light is on, it means that the relay is connected, but the TV is not turned on, and the first pin of U1 is at low level; after 10 seconds, the relay will be cut off, and the LED will also go out, and the first pin of U1 will be turned off. to high level.

6. TV power supply control circuit, the relay RL1 is controlled by 12VDC, the control coil is high internal resistance, 10A/250VAC specification, low power consumption, and sensitive control. The control transistor Q1 adopts a general-purpose 30V/200mA NPN transistor.

The utility model is directly connected between the TV set and the power supply without any improvement on the structure of the existing TV set, and the user can control the TV set to be turned on and off with a remote control like an ordinary TV set, so that people do not need to plug and unplug the power supply Inconvenience caused by plugs and walking back and forth; and because the utility model has less power consumption and strong anti-infrared interference ability, the utility model saves electric energy and prolongs the service life of the TV set at the same time.

Claims (1)

1. A TV power-saving switch, comprising a power plug and an output socket, is characterized in that: between the power plug and the output socket, a PCB circuit board is connected, and the circuit board has a lightning strike protection circuit, a power supply circuit, and a TV set successively. Current detection circuit, TV power control circuit; lightning protection circuit is connected to the TV through the TV power control circuit; the infrared signal receiving circuit receives the control signal of the remote control, one end of which is connected to the power circuit, and the other end is detected by the TV current. The measuring circuit and the TV power supply control circuit are connected with the TV; the TV current detecting circuit is also connected with the LED indicating circuit.

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