CN2162057Y - Automatic power-off protector for colour TV set with remote-control device - Google Patents

Abstract

The utility model relates to an automatic power-off protector for a colour TV provided with a remote-control device, comprising an overvoltage protective circuit, a detection circuit, an electronic switching circuit and a breaker. The action of the electronic switching circuit which is made up of a trigger N1 (NE555) is controlled by detecting signals with the detection circuit; at last, a relay is controlled to obtain or lose electricity. A loop is switched on or off is completed by the action of a normally open contact which is connected with an output circuit; therefore, the problem that the power supply colour TV provided with a remote-control device can not be cut off. The utility model has the advantages of safety, electricity saving, reliability, overvoltage protection, etc., and is suitable for colour TV sets with remote-control devices of various model numbers and specifications.

Description

Automatic power-off protector for colour TV set with remote-control device

The utility model relates to a kind of remote control colour TV set automatic power-off protection device.

At present, remote control colour TV set is implemented shutdown, when shutting down automatically, can not be realized cutting off automatically the colour TV working power, also relies on the people to go to excise working power, and this is consumed power not only, and dangerous.

Its purpose of the utility model just is to provide a kind of remote control colour TV set automatic power-off protector, when remote-control closedown, can cut off the colour TV working power automatically, and power failure and over-voltage protecting function are arranged.

The technical scheme that realizes above-mentioned purpose and adopt is by fuse FU and thermistor R ₁Series connection constitutes overvoltage crowbar, and incoming transport civil power, relay K M switch one terminate at fuse FU and thermistor R ₁Between, relay K M switch another termination voltage transformation and voltage stabilizing circuit, relay K M switch ends button S in parallel ₁, the common port of relay K M switch and voltage transformation and voltage stabilizing circuit is the output loop phase line of this device, testing circuit one tunnel meets thermistor R ₁And between the electric main zero line, the one tunnel connects electronic switch control circuit, and Third Road is the output loop zero line of this device, and electronic switch control circuit one tunnel connects voltage transformation and voltage stabilizing circuit, and electrical equipment KM coil one end is succeeded in electronic switch control circuit output.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is a theory diagram;

Fig. 2 is a circuit diagram.

Connect this device input AC civil power, press the button S ₁, when the colour TV operate as normal, current sinking 〉=150mA, after testing circuit detected, it is electric that electronic switch control circuit gets relay, and the normally opened contact closure is with button S ₁Self-locking is for colour TV provides working power.Testing circuit is by resistance R ₉, R ₇, diode V ₁, capacitor C ₃, resistance R ₈With triode V ₈Constitute resistance R ₇With diode V ₁Series connection, diode V ₁Negative electrode and capacitor C ₃Anodal, triode V ₈Base stage is joined, capacitor C ₃Negative pole and triode V ₈Emitter-base bandgap grading links to each other, resistance R ₉Be connected on the zero line of this device output loop its termination capacitor C ₃Negative pole, a terminating resistor R ₇, resistance R ₈Meet triode V ₈Between base stage and the emitter-base bandgap grading, triode V ₈Current collection is the output of testing circuit very, is connected on trigger N ₁(NE555) the 2nd pin.At this moment, the resistance R in testing circuit ₇End obtains a voltage through diode V ₁Rectification, capacitor C ₃After the filtering at triode V ₈Base stage is mentioned a high level, and triode V ₈Collector electrode and capacitor C ₄Positive pole joins, capacitor C ₄By resistance R ₆Charging is high potential, triode V ₈Saturation conduction, capacitor C ₄Through triode V ₈Discharge is low level, i.e. trigger N ₁(NE555) the 2nd, 6 pin are low level, output (trigger N ₁The 3rd pin) is high level, triode V ₆Saturation conduction, at this moment diode V ₅Bright, relay K M coil gets electric adhesive, its normally opened contact KM closure, this device output AC mains supply.

Electronic switching circuit is by trigger N ₁(NE555) and peripheral resistance, electric capacity and triode V ₆, light-emitting diode V ₅Constitute trigger N ₁(NE555) the 1st pin connects on the zero line of this device output loop, and the 5th pin meets shunt capacitance C ₅After connect the output loop zero line, resistance R ₄, R ₆And capacitor C ₄Series connection (C ₄Negative pole connects the output loop zero line), resistance R ₄The hot end of the direct voltage that another termination obtains after voltage stabilizing, filtering, wherein resistance R ₄, R ₆Between meet trigger N ₁4th, 8 pin, resistance R ₆, capacitor C ₄Meet trigger N between the positive pole ₁2nd, 6 pin, and and the triode V of testing circuit ₈Collector electrode links to each other, trigger N ₁The 3rd pin is an output, connecting resistance R ₅With triode V ₆Base stage, triode V ₆Emitter-base bandgap grading connects the output loop zero line, collector electrode sending and receiving optical diode V ₅Negative electrode.

When the colour TV remote control is in shutdown (or time-out), current sinking≤100mA, resistance R in the testing circuit ₇End is electronegative potential, through diode V ₁Rectification, capacitor C ₃After the filtering, triode V ₈The voltage that the base stage place obtains is low-voltage, triode V ₈End, at this moment, resistance R ₆To capacitor C ₄Charging after 25 seconds, is high level, i.e. trigger N approximately ₁(NE555) the 2nd, 6 pin are high level, trigger N ₁Exporting the 2nd pin is low level, i.e. triode V ₆Base stage is an electronegative potential, triode V ₆End light-emitting diode V ₅Extinguish, because relay K M coil one termination light-emitting diode V ₅Anode, another termination be through voltage stabilizing, the hot end of the DC power supply that obtains after the filtering, and relay K M coil losing electricity at this moment, its normally opened contact disconnects, and has cut off the output loop phase line of this device, and colour TV is not worked.

During temporary interruption, this device is not charged, and relay is in power failure state, after waiting to send a telegram here, and must be through restarting button S ₁Can make colour TV work.At this moment the electric main power supply is through button S ₁, process is by resistance R ₂And capacitor C ₁The voltage conversion circuit that constitutes in parallel, it one terminates on the relay K M normally opened contact (fixed contact), and the other end is exported to voltage stabilizing, filter circuit, passes through voltage-stabiliser tube V again ₂, V ₃, diode V ₄, resistance R ₃And capacitor C ₂After voltage stabilizing, the filtering, obtain 20 volts of direct voltages, offer relay K M coil and trigger N ₁(KM555) operating voltage, resistance R ₆To capacitor C ₄Charging is not reaching trigger N ₁During the 2nd pin upset level, the 3rd pin is output as high level, triode V ₆Saturation conduction, light-emitting diode V ₅Bright, relay K M coil gets electric its normally opened contact KM closure, with button S ₁Self-locking provides the output AC mains supply, when treating colour TV work, and triode V ₈Saturation conduction, capacitor C ₄Through triode V ₈Discharge, current collection is electronegative potential very, trigger N ₁The output high level, relay K M gets electric, its normally opened contact closure, power connection, colour TV work.

For overvoltage protection, this device has adopted fuse FU and thermistor R ₁Duplicate protection makes colour TV not be subjected to affected by high.

When using this device, the attaching plug of this device is inserted into 220 volts of electric main supply sockets, the colour tv power supply plug is inserted in this device receptacle, press button S ₁The work of can starting shooting when having a power failure, after waiting to send a telegram here, must be restarted button S ₁Can make colour TV work.This circuit also can place in the machine cooperating use with remote control colour TV set power circuit part branch.

This device compared with prior art has the following advantages:

1, owing to adopted these characteristics of colour TV its current sinking 〉=150mA of when work, utilizes testing circuit to detect this signal, remove to control trigger N₁(NE555) output potential makes relay coil get electric or dead electricity thereby reach, the final realization being switched on or switched off of colour TV working power, thereby have that colour TV is Remote Control Automatic cuts off the electricity supply, the function that automatic shutdown is cut off the electricity supply during power failure, safety, economize on electricity.

2, owing to adopted fuse and thermistor proportion holding circuit structure, thereby strengthened the overvoltage protection effect of adopting electricity.

Claims (5)

1, the automatic power-off protector of a kind of remote control colour TV set is by fuse FU and thermistor R ₁Series connection constitutes overvoltage crowbar, and incoming transport civil power, relay K M switch one terminate at fuse FU and thermistor R ₁Between, relay K M switch another termination voltage transformation and voltage stabilizing circuit is characterized in that, relay K M switch ends button S in parallel ₁, the common port of relay K M switch and voltage transformation and voltage stabilizing circuit is the output loop phase line of this device, testing circuit one tunnel meets thermistor R ₁And between the electric main zero line, the one tunnel connects electronic switch control circuit, and Third Road is the output loop zero line of this device, and electronic switch control circuit one tunnel connects voltage transformation and voltage stabilizing circuit, and electrical equipment KM coil one end is succeeded in electronic switch control circuit output.

2, the automatic power-off protector of remote control colour TV set according to claim 1 is characterized in that testing circuit is by resistance R ₉, R ₇, diode V ₁, capacitor C ₃, resistance R ₈With triode V ₈Constitute resistance R ₇With diode V ₁Series connection, diode V ₁Negative electrode and capacitor C ₃Anodal, triode V ₈Base stage is joined, capacitor C ₃Negative pole and triode V ₈Emitter-base bandgap grading links to each other, resistance R ₉Be connected on the zero line of this device output loop its termination capacitor C ₃Negative pole, a terminating resistor R ₇, resistance R ₈Meet triode V ₈Between base stage and the emitter-base bandgap grading, triode V ₈Current collection is the output of testing circuit very, is connected on trigger N ₁(NE555) the 2nd pin.

3, the automatic power-off protector of remote control colour TV set according to claim 1 is characterized in that, electronic switching circuit is by trigger N ₁(NE555) and peripheral resistance, electric capacity and triode V ₆, light-emitting diode V ₅Constitute trigger N ₁(NE555) the 1st pin connects on the zero line of this device output loop, and the 5th pin meets shunt capacitance C ₅After connect the output loop zero line, resistance R ₄, R ₆And capacitor C ₄Series connection (C ₄Negative pole connects the output loop zero line), resistance R ₄The hot end of the direct voltage that another termination obtains after voltage stabilizing, filtering, wherein resistance R ₄, R ₆Between meet trigger N ₁4th, 8 pin, resistance R ₆, capacitor C ₄Meet trigger N between the positive pole ₁2nd, 6 pin, and and the triode V of testing circuit ₈Collector electrode links to each other, trigger N ₁The 3rd pin is an output, connecting resistance R ₅With triode V ₆Base stage, triode V ₆Emitter-base bandgap grading connects the output loop zero line, collector electrode sending and receiving optical diode V ₅Negative electrode.

4, the automatic power-off protector of remote control colour TV set according to claim 1 is characterized in that, relay K M coil one termination light-emitting diode V ₅Anode, the hot end of the DC power supply that another termination obtains after voltage stabilizing, filtering.

5, according to the automatic power-off protector of my described remote control colour TV set of claim, it is characterized in that voltage conversion circuit is by resistance R ₂And capacitor C ₁Formation in parallel, one terminates on the relay K M normally opened contact (fixed contact), and the other end is exported to voltage stabilizing, filter circuit.

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