CN217281492U

CN217281492U - Temperature protection plug or socket

Info

Publication number: CN217281492U
Application number: CN202122698032.1U
Authority: CN
Inventors: 朱慧恒; 朱文彦; 尤富强
Original assignee: Zhiyan Chuangke Co ltd
Current assignee: Zhiyan Chuangke Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-08-23
Anticipated expiration: 2031-11-05

Abstract

The utility model provides a temperature protection plug or socket, it includes zero line terminal direct contact's confession temperature sensor I, makes the heat of zero line terminal in time to the temperature sensor conduction to reduce the response time delay, cut off switch in proper order. Since the negative pole of the direct current is collinear with the neutral terminal, this means that the temperature sensor I can use a low voltage isolation sensor, which is relatively safe even if a breakdown occurs between the housing and the pins of the temperature sensor I.

Description

Temperature protection plug or socket

Technical Field

The utility model relates to a power plug or socket, especially plug or socket with temperature protection.

Background

The power plug and the power socket are devices for connecting the electrical equipment and the electric wire. The higher the power of the electrical device, the greater the current required. If the power plug and the socket are in poor contact, the resistance value of the connection part is increased, and when a large current is passed, a high temperature is generated at the connection part, thereby possibly causing a fire hazard.

In the prior art, a plug with thermal protection is provided to check the temperature of the plug terminals. When the temperature is much higher than normal, which means that there is a high probability of poor contact between the plug and the socket, it is necessary to cut off the power supply to avoid the risk of fire. Generally, the operating voltage of an MCU with a temperature sensor is usually 5V or less. However, the voltage of the power plug is generally 110V or 220V, which is much higher than the voltage that the MCU can withstand, so the temperature sensor usually uses a high voltage isolation sensor to avoid breakdown. Or voltage isolation must be added between the temperature sensor and the terminals of the power plug, but this can lead to poor heat transfer or a lag in the response of the power shut down.

SUMMERY OF THE UTILITY MODEL

To the above defect of prior art, the utility model provides a temperature protection plug or socket, it can use the temperature sensor that the low-voltage was kept apart to detect power plug's zero line terminal's temperature to can not lead to voltage control system to appear puncturing.

A temperature protection plug or socket including at least one live terminal and one neutral terminal mounted in a housing; a temperature sensor I for detecting temperature is arranged on the zero line terminal, and a shell of the temperature sensor I is in direct contact with the zero line terminal; a pin of the temperature sensor I is connected to a control system, and the control system at least comprises a temperature control circuit, a power supply and a power supply switch; the temperature circuit is connected with a pin of the temperature sensor I to acquire the temperature of the zero line terminal; the power switch is controlled by the temperature circuit and is connected between the live wire terminal and the electrical equipment; a power supply for converting alternating current into direct current is connected with a live wire terminal and a zero line terminal, and the negative pole of the output end of the power supply is collinear with the zero line terminal; when the temperature of the zero line terminal exceeds the upper limit temperature, the temperature circuit sends a signal to cut off the power switch.

Further, the temperature sensor I of the zero line terminal is a temperature sensor adopting low-voltage isolation.

Further, the temperature sensor II who adopts the high pressure to keep apart is connected to the live wire terminal and detects the temperature of live wire terminal, and temperature sensor II's pin is connected to temperature circuit.

Furthermore, the temperature circuit adopts a singlechip, and a pin of the temperature sensor I is connected with a corresponding I/O port of the singlechip; the power switch is a relay, a coil terminal of the relay is connected with an I/O port of the single chip microcomputer through a driver, and a contact terminal of the relay is connected to a live wire terminal.

Further, the temperature circuit is provided with a zero-crossing circuit, and the power switch is switched on/off when the live wire voltage crosses zero.

The utility model has the advantages that: the temperature sensor I is directly contacted with the zero line terminal, so that the heat of the zero line terminal can be transferred to the temperature sensor in time, the response delay is reduced, and the power switch is quickly cut off. And because the negative pole of the direct current is collinear with the zero line terminal, this means that the temperature sensor I can use a low-voltage isolation sensor, even if breakdown occurs between the shell and the pin of the temperature sensor I, the safety fault cannot be caused.

Drawings

The present invention will be further described with reference to the accompanying drawings.

FIG. 1 is an exploded view of a first embodiment of the present invention;

FIG. 2 is an exploded view of a second embodiment of the present invention;

FIG. 3 is a circuit diagram of a power supply circuit and a zero crossing circuit;

FIG. 4 is a circuit diagram of a temperature circuit;

FIG. 5 is a circuit diagram of a temperature sensor;

fig. 6 is a circuit diagram of the power switch.

In the figure, 1 is a live wire terminal, 2 is a zero line terminal, 3 is a shell, 4 is a temperature sensor I, 5 is a control system, and 6 is a temperature sensor II.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Referring to fig. 1 to 3, a temperature protection plug or socket includes at least one hot terminal 1 and one neutral terminal 2. All the components of the temperature protection plug or socket are mounted in a housing 3, which comprises a temperature sensor I4 and is connected to the neutral terminal 2 for detecting the temperature. The shell of the temperature sensor I4 is in direct contact with the zero line terminal 2, so that the heat of the zero line terminal 2 is directly transferred to the temperature sensor I4, thereby improving the heat transfer speed and improving the response delay to rapidly cut off the power switch. Typically, the power supply needs to be isolated from the ac power supply, and therefore the temperature sensor must be isolated at high voltage to avoid breakdown between the housing and the pins. When a fault occurs, the ac current can short directly into the control system 5, causing all parts to break back and possibly causing a user to get an electric shock. The most important point of the utility model is that the direct current cathode of the power supply is collinear with the zero line terminal 2. This means that the temperature sensor I4 can use a low voltage isolation sensor even if the breakdown between the housing and the pins of the temperature sensor I4 is relatively safe.

Referring to fig. 4 and 5, the control system 5 may collect temperature data from the temperature sensor I4 to determine whether the temperature exceeds an upper limit temperature. It includes at least a temperature circuit, a power supply and a power switch. The temperature circuit is mainly an MCU, a pin of the temperature sensor I4 is connected to an I/O port of the MCU, an A/D module arranged in the MCU converts voltage output by the temperature sensor I4 into temperature data, and then the MCU compares the temperature data with the set upper limit temperature.

Referring to fig. 6, the power switch is a relay that is generally used. The coil terminals of the relays are connected to the respective I/O ports of the MCU. Generally, the driving current of the coil is much higher than the current that can be output by the MCU, so a driver must be set at the output I/O port of the MCU. The driver may be a transistor, a MOS drive circuit, or a drive IC. The contact terminals of the relay are connected to the hot terminal 1. It is known that when a relay is operated at the peak of the alternating current, the contacts can spark and cause damage, so that it is necessary to operate the relay at the zero point of the alternating current. Referring to fig. 3, there is provided a zero-crossing circuit including a diode rectifying an alternating current into a forward pulse voltage, and a voltage dividing circuit reducing the voltage to not more than 5V, and a transistor circuit for identifying a zero point in the pulse voltage to output a signal to a corresponding I/O port of the MCU, so as to allow the MCU to control the relay to operate only when the alternating current crosses zero.

Except for zero line terminal 2, contact failure also probably appears in live wire terminal 1, so must set up some similar circuits on live wire terminal 1, from this the utility model provides a temperature sensor II 6 is connected to live wire terminal 1. However, if the temperature sensor II 6 breaks down, the high voltage of the alternating current will possibly be transmitted to the low voltage circuit and cause damage, so the temperature sensor II 6 must be isolated with high voltage to avoid the breakdown. Like the temperature sensor I, a pin of the temperature sensor II 6 is connected to an I/O port of the MCU, and an A/D module arranged in the MCU converts the voltage of the temperature sensor II 6 into temperature data. The MCU will compare the temperature data with the set upper temperature limit.

Claims

1. Temperature protection plug or socket, its characterized in that: comprises at least one live wire terminal (1) and one neutral wire terminal (2) which are arranged in a shell (3); a temperature sensor I (4) for detecting temperature is arranged on the zero line terminal (2), and a shell of the temperature sensor I (4) is in direct contact with the zero line terminal (2); the pin of the temperature sensor I (4) is connected to a control system, and the control system (5) at least comprises a temperature control circuit, a power supply and a power supply switch; the temperature circuit is connected with a pin of the temperature sensor I (4) to acquire the temperature of the zero line terminal (2); the power switch is controlled by a temperature circuit and is connected between the live wire terminal (1) and the electrical equipment; a power supply for converting alternating current into direct current is connected with the live wire terminal (1) and the zero line terminal (2), and the negative electrode of the power supply output end is collinear with the zero line terminal (2); when the temperature of the zero line terminal (2) exceeds the upper limit temperature, the temperature circuit sends a signal to cut off the power switch.

2. A temperature protection plug or socket according to claim 1, wherein: and the temperature sensor I (4) of the zero line terminal (2) is a temperature sensor adopting low-voltage isolation.

3. A temperature protection plug or socket according to claim 1, wherein: a temperature sensor II (6) isolated by high voltage is connected to the fire wire terminal (1) and detects the temperature of the fire wire terminal (1), and a pin of the temperature sensor II (6) is connected to a temperature circuit; the temperature circuit adopts a singlechip, and a pin of a temperature sensor I (4) is connected with a corresponding I/O port of the singlechip; the power switch is a relay, a coil terminal of the relay is connected with an I/O port of the single chip microcomputer through a driver, and a contact terminal of the relay is connected to the live wire terminal (1).

4. A temperature protection plug or socket according to claim 1 or 3, wherein: the temperature circuit is provided with a zero-crossing circuit, and the power switch is switched on/off when the live wire voltage is zero.