DE102012013782B4 - Temperature protection device for socket - Google Patents

Abstract

Temperature protection device for a socket with input connections, wherein a relay (RL1) is connected in series with a 220 V AC working circuit of the socket for controlling or regulating the on/off state of the working circuit of the socket, wherein a temperature sensor with a protective function (3) is connected in series with the supply circuit of the coil of the relay (RL1), a temperature protection sensor (3) is arranged in a temperature sensor area which consists of a thermally conductive component which dissipates the heat of a contact of the relay (RL1) through a thermally conductive medium, and the contact of the relay (RL1) is electrically connected in series with a pad (6,7) of the corresponding contact on a circuit board and through the pad (6,7) with the working circuit of the socket, characterized in that the temperature sensor area has a temperature sensor clip (5) with a temperature protection sensor (3) which is fastened in a U-shaped clip body in order to record the temperature of the temperature sensor clip, wherein the temperature sensor clip (5) is connected to the pad (6,7) of the Relay contact on the circuit board is thermally conductively connected by the thermal conductivity material or heat-conducting material, such that the temperature protection sensor (3) detects the temperature of the relay contact and the temperature protection sensor (3) is disconnected when a predetermined temperature is exceeded, so that the power supply to the coil of the relay (RL1) and, via the relay contact, the working circuit of the socket is switched off.

Description

Field of the invention

The present invention relates to a temperature protection device of an electrical appliance, particularly it relates to a temperature protection device for a socket, and particularly it relates to a temperature protection device of the socket with a relay control device.

Background of the invention

When the working current of a socket becomes too large, the temperature of the socket rises. In order to prevent the possibility of accidents caused by excessive temperature, a protective tube is generally connected in series with the working circuit. When the working current is too high, the power supply is cut off. When the working current reaches 2.5 times the rated current, the conventional protective circuit is turned off. Therefore, there is a problem of temperature rise for some high-power sockets, for example, when the rated current is 16A and the working current for the test is 20A, and it is difficult to achieve the goal of temperature protection by connecting a protective circuit in series with the working circuit. From the closest prior art in the form of DE 20 2008 001 209 U1 a wirelessly controlled mains socket has become known. The mains socket comprises an AC input plug that can be connected to an AC power supply; an AC mains output socket that can be connected to electrical devices; a control circuit for a remote control is arranged within the housing of the socket; the control circuit has a DC supply circuit and, connected in series, a receiving circuit for a remote control signal, a baseband signal, a decoding circuit and a mains control circuit that controls an AC mains output, characterized in that a thermal protection component is arranged within the housing of the socket, which can automatically melt at a certain temperature; the thermal protection component is connected to the control circuit for the remote control or to the AC mains input circuit or output circuit.

The object of the invention is to overcome the disadvantages of the prior art. According to the invention, this object is achieved by the features of claim 1.

Summary of the invention

The technical problem that the present invention aims to solve is to provide a temperature protection device for a socket that has a simple structure but operates reliably and that can be used in a high-power socket.

• ein Relaisunterbrecherkontakt wird in Reihe mit dem Arbeitsstromkreis einer Steckdose geschaltet, um das An/Aus des Arbeitsschaltkreises der Steckdose zu kontrollieren bzw. zu steuern;
• ein Temperaturschutzfühler (temperature protective tube) wird mit dem Stromversorgungsstromkreis der Relaisspule in Reihe geschaltet, und der Temperatur(schutz)fühler befindet sich im Temperaturschutzfühlerbereich, der aus einer wärmeleitfähigen Komponente, die die Wärme des Realiskontakts durch ein Wärmeleitfähigkeitsmedium ableitet, besteht.

The technical proposal to solve the above problem is:

• a relay breaker contact is connected in series with the working circuit of a socket to control the on/off of the working circuit of the socket;
• a temperature protective tube is connected in series with the power supply circuit of the relay coil, and the temperature (protection) sensor is located in the temperature protection sensor section, which consists of a thermally conductive component that dissipates the heat of the relay contact through a thermally conductive medium.

Furthermore, the relay contact is electrically connected to a pad of a corresponding contact on a circuit board and is connected in series with the working circuit of the socket through the contact pad;
the structure of the temperature sensor portion is as follows: a temperature sensor clip made of thermal conductivity material is provided, the temperature sensor clip is thermally conductively connected to the pad of the relay contact on the board through the thermal conductivity material;
the temperature sensor clip itself or the temperature sensor clip and the pad of the relay contact or the temperature sensor clip and other components that can conduct the heat of the relay contact form a U-shaped clip body; the temperature protection probe is fixed in the body of the U-shaped clip to sense the temperature of the temperature sensor clip.

• Wenn der Temperatursensorbereich aus Komponenten besteht, die die Wärme des Relaiskontakts durch das Wärmeleitfähigkeitsmedium leiten können, weist dessen Temperatur eine positive Korrelation mit der Temperatur des Relaiskontakts auf. Da der Relaiskontakt mit dem Arbeitsstromkreis der Steckdose in Reihe geschaltet ist, nimmt die Temperatur des Relaiskontakts, wenn der Strom groß wird, zu und die Temperatur des Temperatursensorbereichs, in dem der Temperaturschutzfühler bereitgestellt ist, nimmt ebenfalls zu. Wenn der Arbeitsstrom der Steckdose über einem vorbestimmten Bereich liegt, liegt die Temperatur des Temperatursensorbereichs oberhalb eines definierten Werts, der Temperaturschutzfühler im Temperatursensorbereich wird getrennt, die Stromversorgung der Relaisspule wird abgeschaltet und der Relaiskontakt schaltet den Arbeitsstromkreis der Steckdose ab, um vor der Temperatur zu schützen.

The principle of operation of the present invention is as follows:

• If the temperature sensor section is composed of components that can conduct the heat of the relay contact through the thermal conductivity medium, its temperature has a positive correlation with the temperature of the relay contact. Since the relay contact is connected in series with the working circuit of the socket, when the current becomes large, the temperature of the relay contact increases, and the temperature of the temperature sensor section where the temperature protection sensor is provided also increases. When the working current of the socket is above a predetermined range, the temperature of the temperature sensor area is above a defined value, the temperature protection sensor in the temperature sensor area is disconnected, the power supply of the relay coil is cut off, and the relay contact switches off the working circuit of the socket to protect against the temperature.

The structure of the present invention is simple, reliable, and tailored to the temperature protection of a high-power socket to prevent the occurrence of fire when it is above the rated current.

Short description of the drawings

• 1 is the control block diagram of a remote control socket according to Embodiment 1 of the present invention;
• 2 is the perspective schematic view according to Embodiment 1 of the present invention;
• 3 is the perspective schematic view in direction A of 2 ;
• 4 is the perspective schematic view in direction B of 2 ;
• 5 is the perspective schematic view according to Embodiment 2 of the present invention;
• 6 is the perspective schematic view in direction C of 5 ;
• 7 is the perspective schematic view in direction D of 5 ;

1

circuit board

2

relay

21

Relay housing

22

Relay contact pin

23

Relay coil pin

3

Temperature protection sensor

31

Temperature protection sensor pin

5

Temperature sensor clip

51

Soldering pin of the temperature sensor clip

6

Contact pad

7

Contact pad

8th

Connecting the socket

Detailed description of the preferred embodiments

Embodiment 1 (Fig. 1 to 4)

This embodiment is a temperature protection device for a remote control socket. With reference to 1 which is a block diagram of a remote control socket, J1, J2 are 220V AC input terminals and input terminals respectively, and J1, J2 and D1 to D4 consist of a bridge rectifier circuit. The voltage regulation line Z1, capacitance C9, C2 form a +24V DC power supply circuit, and voltage regulation line Z2, capacitance C4, C3 and resistor R6 form a +5V DC power supply circuit.

The neutral input terminal J2 is electrically connected to the neutral output terminal J3 of the remote control socket. The live input terminal J1 is electrically connected to the live output terminal J4 of the remote control socket via a breaker contact of the relay RL1. The relay RL1 controls the on/off of the output circuit of the remote control socket.

• ein Fernbedienungsempfangskreis, bestehend aus Antenne L2 und einem externen Stromkreis wird verwendet, um ein Fernbedienungs-Einschalt-/Ausschalt-Signal aufzunehmen;
• ein U1(H8006) und ein externer Stromkreis bilden den Codierungsschaltkreis, ein U2(24C02) ist der Speicherschaltkreis, der Ausgabeanschluss des Fernbedienungsempfangsstromkreises RF_DATAIN ist mit Pin 7 des Codierungsschaltkreises verbunden und Pin 5 des Ausgabekontroll-bzw. -steuerungscodierungsschaltkreises ist mit der Basis des Steuerschalttransistors (switch control tube) Q1 verbunden.

The remote control circuit is as follows:

• a remote control receiving circuit consisting of antenna L2 and an external circuit is used to receive a remote control on/off signal;
• a U1(H8006) and an external circuit form the encoding circuit, a U2(24C02) is the memory circuit, the output terminal of the remote control receiving circuit RF_DATAIN is connected to pin 7 of the encoding circuit, and pin 5 of the output control encoding circuit is connected to the base of the switch control tube Q1.

The coil of relay RL1 is connected in series with the collector of control switching transistor Q1 and +24V power, Q1 controls the on/off of the supply circuit of the relay coil and the contact of relay RL1 is connected to the circuit of the power terminal J4 of the remote control socket.

• Im Versorgungskreislauf der Spule des Relais 2 (RL1 im Blockdiagramm) ist der Temperaturschutzfühler 3 (F1 im Blockdiagramm) in Reihe geschaltet. Der Typ des Temperaturschutzfühlers 3 dieses Beispiels ist K18;
• Mit Bezug auf 2 wird das Relais 2 dieses Beispiels auf eine gedruckte Platine 1 montiert und die zwei Kontaktpins 22 des Relais jeweils durch Löten mit dem Kontaktpad 6, 7 der Platine verbunden (3) und die zwei Kontaktpads werden jeweils mit dem stromführenden Eingabeanschluss J1 und dem stromführenden Ausgabeanschluss J4 elektrisch verbunden, und die zwei Kontakte des Relais werden mit dem stromführenden Ausgabearbeitsschaltkreis der Steckdose durch die Kontaktpads in Reihe verbunden.

The temperature protection device of this example is as follows:

• In the supply circuit of the coil of relay 2 (RL1 in the block diagram), the temperature protection sensor 3 (F1 in the block diagram) is connected in series The type of temperature protection sensor 3 in this example is K18;
• Regarding 2 the relay 2 of this example is mounted on a printed circuit board 1 and the two contact pins 22 of the relay are each connected by soldering to the contact pad 6, 7 of the circuit board ( 3 ) and the two contact pads are electrically connected to the live input terminal J1 and the live output terminal J4, respectively, and the two contacts of the relay are connected to the live output working circuit of the socket through the contact pads in series.

Regarding 3 and 4 a temperature sensor clip 5, U-shaped made of metallic material, is connected to one contact pad 6 of the two contact pads by soldering (or connected to the other contact pad 7 by soldering). A temperature protection probe 3 is clamped into the flexible clip body of the temperature sensor clip to sense the temperature of the temperature sensor clip, and the temperature protection probe is electrically insulated from the temperature sensor clip.

The metal temperature sensor clip in this example is made of copper. After soldering to the contact pad, the temperature sensor clip conducts the heat of the relay contact through the contact pad and allows the temperature protection probe to be clamped into the U-shaped body of the temperature sensor clip to sense the temperature of the relay contact.

When the voltage of this remote control socket is below the rated voltage and the current is not over the rated current of the relay contact of 16A, the temperature protection sensor K18 selected in this embodiment does not work, so that the socket maintains its normal working state. When the working current of the relay contact is over 16A, the temperature rises too much, and the temperature protection sensor clipped in the temperature sensor clip is cut off, so that the relay coil, relay contact and the working circuit of the socket are cut off to protect against the temperature.

Embodiment 2 (Fig. 5, 6, 7)

• Der Temperatursensorclip 5 dieses Beispiels ist nahe des Gehäuses 21 des Relais 2 angeordnet, und bildet einen U-förmigen Temperatursensorclipkörper mit dem Gehäuse des Relais, Pin 51 des Temperatursensorclips im unteren Teil des Temperatursensorclips ist mit einem Pad 6 der zwei Pads 6, 7 des Relaiskontakts durch die Platine durch Löten verbunden, und der Temperaturschutzfühler 3 ist in den U-förmigen Clipkörper, der durch den Temperatursensorclip 5 und das Gehäuse 21 des Relais gebildet wird, geklemmt.

The difference from embodiment 1 is as follows:

• The temperature sensor clip 5 of this example is arranged near the housing 21 of the relay 2, and forms a U-shaped temperature sensor clip body with the housing of the relay, pin 51 of the temperature sensor clip in the lower part of the temperature sensor clip is connected to one pad 6 of the two pads 6, 7 of the relay contact through the board by soldering, and the temperature protection sensor 3 is clamped in the U-shaped clip body formed by the temperature sensor clip 5 and the housing 21 of the relay.

The temperature sensor clip 5 of this example conducts the heat of the relay contact through the contact pad 6. When the housing 21 of the relay 2 is made of electrically insulating resin material, the thermally conductive medium air in the housing conducts the heat of the relay contact, so that the U-shaped body formed by the temperature sensor clip and the housing of the relay conducts the temperature of the relay contact to the temperature protection sensor.

The present invention is particularly suitable for a remote control socket, which is also called a socket with an auxiliary device, such as a remote control socket, a socket with a timer, etc. The sockets of the above two embodiments are remote control sockets in which the relay itself has the function of controlling the on/off of the socket output. When the present invention is carried out, it is only necessary to add some components such as a temperature protection sensor. While the relay of this device is used, it can also perform the on/off function of the temperature protection.

The above is only a better embodiment of the present invention and does not limit the design in any way. Any simple change, equivalent replacement and modification made in accordance with the technical substance of the present invention belongs to the scope of the technical solution of the present invention.

Claims (3)

Temperature protection device for a socket with input terminals, wherein a relay (RL1) is connected in series with a 220 V AC working circuit of the socket for controlling or controlling the on/off state of the working circuit of the socket, wherein a temperature sensor with protection function (3) is connected in series with the supply circuit of the coil of the relay (RL1), a temperature protection sensor (3) is arranged in a temperature sensor area consisting of a thermally conductive component which dissipates the heat of a contact of the relay (RL1) through a thermally conductive medium, and the contact of the relay (RL1) is electrically connected in series to a pad (6,7) of the corresponding contact on a circuit board and through the pad (6,7) to the working circuit of the socket, characterized in that the temperature sensor area has a temperature sensor clip (5) with a temperature protection sensor (3) which is fastened in a U-shaped clip body in order to record the temperature of the temperature sensor clip, the temperature sensor clip (5) being thermally conductively connected to the pad (6,7) of the relay contact on the circuit board by the thermal conductivity material or thermally conductive material, such that the temperature protection sensor (3) records the temperature of the relay contact and the temperature protection sensor (3) is disconnected when a predetermined temperature is exceeded, so that the power supply to the coil of the relay (RL1) and, via the relay contact, the working circuit of the socket is switched off. Temperature protection device for a socket according to Claim 1 , characterized in that the temperature sensor clip (5), made of a metal material and U-shaped, is connected to one of the two pads (6,7) by soldering and the temperature protection sensor (3) is clamped into the clip body. Temperature protection device for a socket according to Claim 1 , characterized in that the temperature sensor clip (5) is made of a metal material and attached close to the housing (21) of the relay (2), which together with the housing of the relay forms a U-shaped temperature sensor clip body, the lower part of the temperature sensor clip being connected to one of the two pads (6/7) by soldering and the temperature protection sensor (3) being clamped into the U-shaped clip body formed by the temperature sensor clip (5) and the housing (21) of the relay (2).

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