JP6114415B1 - Lamp with overheat protection device - Google Patents

Abstract

A high power LED lamp with an overheat protection device with improved slowness of reaction is provided. A housing includes a housing, a base board, an overheat protection unit, and an LED. The LED is disposed on the base board, and the overheat protection unit directly contacts the base board. It has a conductive surface. If the LED is overheated, the thermal energy is transferred to the baseboard and then to the overheat protection unit, allowing the overheat protection unit to be heated quickly and directly, reducing the reaction time. Thus, overheating of the LED is prevented. [Selection] Figure 1

Description

  The present invention relates to lamps, and more particularly to lamps with overheat protection devices.

  LED (light emitting diode) lamps have been widely used due to the advantages of low power consumption and long life. The high-power high-intensity LED lamp is one of the LED lamps, and the high-power LED lamp can generate high luminance, but also generates a large amount of heat.

High power LED lamps are usually provided with heat dissipation fins and overheat protection devices. The overheat protection device includes a PTC (Positive Temperature Coefficient) thermistor disposed in a ceramic casing and two external terminals, and the PTC thermistor is connected to the circuit board through these external terminals to connect the LED or other components. Can establish an electrical connection.
When an LED or other component overheats, causing the circuit board to overheat, the PTC thermistor increases resistance to reduce the circuit board current, or switch the LED or other component on the circuit board. May be turned off.

However, since the PTC thermistor is covered with the ceramic casing, the ambient temperature of the circuit board is conducted by the atmosphere to the casing and to the PTC thermistor. This heat conduction process is indirect and the reaction is slow, so it does not meet the high heat dissipation required for high power LED lamps.
The present invention has been made for the purpose of reducing and / or eliminating the above disadvantages.

  It is an object of the present invention to provide a lamp with an overheat protection device that does not suffer from the disadvantage of slow reaction with conventional overheat protection devices in high power LED lamps.

  Accordingly, a lamp with an overheat protection device according to the present invention includes a housing, a baseboard disposed in the housing, an overheat protection unit having a heat conducting surface in contact with the baseboard, and a baseboard. And at least one light emitting diode disposed and electrically connected to the overheat protection unit.

  The LED of the present invention is disposed on a base board, and the overheat protection unit has a heat conducting surface that directly contacts the base board. If the LED is overheated, the thermal energy can be transferred to the baseboard and then transferred to the overheat protection unit, allowing the overheat protection unit to be heated quickly and directly, reducing the reaction time. Thus, overheating of the LED is prevented.

1 is a cross-sectional view of a lamp with an overheat protection device according to the present invention. It is a partial top view of FIG. FIG. 6 is a cross-sectional view of a lamp with an overheat protection device according to another embodiment of the present invention. FIG. 4 is a partially enlarged view of FIG. 3.

  The present invention will become apparent from the following description taken in conjunction with the accompanying drawings, which illustrate, by way of example only, preferred embodiments according to the invention.

  Reference is made to FIGS. The lamp with an overheat protection device according to the present invention includes a housing 10, a base board 20, an overheat protection unit 30, and an LED (light emitting diode) 40.

  The base board 20 is disposed in the housing 10.

The overheat protection unit 30 has a heat conducting surface S that abuts against the base board 20.
The overheat protection unit 30 can be as shown in FIGS. That is, the overheat protection unit 30A is made of a PTC (positive temperature coefficient) thermistor material and can be screen printed on the base board 20 to form a circuit. As the thermistor material, an oxide sintered product containing BaTiO ₃ , SrTiO ₃ or PbTiO ₃ mixed with a small amount of Nb, Ta, Bi, Sb, La, Mn, Fe, Cu or Cr can be employed.

  The LED 40 is disposed on the base board 20 and is electrically connected to the overheat protection unit 30A. The LED may have one or a plurality.

The overheat protection unit 30A and the LED 40 form a circuit in cooperation with the power source. When the LED 40 is overheated, the thermal energy of the LED 40 can be directly transmitted to the base board 20. Since the overheat protection unit 30A has the heat conduction surface S that comes into contact with the base board 20, the heat of the base board 20 can be directly transmitted to the overheat protection unit 30A through the heat conduction surface S.
The overheat protection unit 30A is made of a PTC thermistor material, and if the overheat protection unit 30A is heated, the resistance value increases. As a result, the current of the LED 40 electrically connected to the overheat protection unit 30A is increased. The value will drop and the LED 40 is switched off to prevent overheating of the LED 40.

The overheat protection unit 30A has a heat conduction surface S that is in contact with the base board 20, and this surface-to-face contact improves the heat conduction efficiency. As a result, the reaction time of the overheat protection unit 30 is reduced. It should be noted that shortening.
Also, as shown in FIGS. 1 and 2, since this overheat protection unit 30A is screen-printed on the base board 20, the degree of freedom of the position and configuration of the overheat protection unit 30A is increased. By facilitating the installation of the LED 40 and other components on the device, the inconvenience and freedom of assembly are improved. The position of the overheat protection unit 30 </ b> A includes, but is not limited to, a position as shown in FIG. 2, and the overheat protection unit 30 </ b> A can be electrically connected to some or all of the LEDs 40.

  3 and 4 show another embodiment of a lamp with an overheat protection device according to the present invention. The overheat protection unit 30B includes a first terminal 31, a second terminal 32, a first external terminal 33, a second external terminal 34, and an insulator 35.

  The first terminal 31 is formed from the chamber 311 and the heat conducting surface S. The chamber 311 includes an opening 312. A convex surface portion 313 and an insulator fixing member 314 are disposed in the chamber 311, and the heat conducting surface S of the first terminal 31 is in contact with the base board 20.

The second terminal 32 is formed by pressing together two metal sheets having different expansion coefficients, one end of which is fixed to the insulator fixing member 314, and the other end of the first terminal 31. It presses against the convex portion 313 so as to be detachable.
In this embodiment, the second terminal 32 includes a first metal sheet 321 and a second metal sheet 322 that press each other, and the expansion coefficient of the first metal sheet 321 is the second metal sheet. The expansion rate of the sheet 322 is larger, and the second terminal 32 includes a metal sheet having a larger expansion rate. This comes into contact with the convex portion 313 of the first terminal 31 in a detachable manner, that is, the first metal sheet 321 comes into contact with the first terminal 31. In this embodiment, the first metal sheet 321 is made of aluminum, and the second metal sheet 322 is made of platinum, but is not limited thereto. By changing the materials of the two metal sheets of the second terminal 32, the reaction time can be changed, and such changes can be made without departing from the scope of the present invention.

  The first external terminal 33 has one end electrically connected to the first terminal 31.

  The second external terminal 34 has one end electrically connected to the second terminal 32.

  An insulator 35 covers the first terminal 31 and the second terminal 32, and this seals the opening 312 of the chamber 311 of the first terminal 31. The other end of the first external terminal 33 or the other end of the second external terminal 34 extends outward from the insulator 35 and is electrically connected to the LED 40.

Further, as shown in FIG. 3, the overheat protection unit 30 can be used in such a manner that the overheat protection unit 30 and the LED 40 form a circuit in cooperation with the power source. When the LED 40 is overheated, the thermal energy of the LED 40 can be directly transmitted to the base board 20. Since the overheat protection unit 30B has the heat conduction surface S that contacts the base board 20, the heat of the base board 20 is directly transmitted to the first terminal 31 of the overheat protection unit 30B through the heat conduction surface S. be able to. On the other hand, the temperature is transmitted to the second terminal 32 that contacts the convex portion 313 of the first terminal 31.
The second terminal 32 is made of two metal sheets having different expansion rates, and the metal sheet on the side in contact with the first terminal 31 of the second terminal 32 is: Since the second terminal 32 is heated, the second terminal 32 is the first terminal because the degree of expansion of the two metal sheets is different if the second terminal 32 is heated. Turn towards 31.
When the second terminal 32 bends, the metal sheet having the larger expansion coefficient bends toward the metal sheet having the smaller expansion coefficient, so that the second terminal 32 is connected to the first terminal 31. The first terminal 31 is disconnected from the second terminal 32, and the entire circuit is also disconnected. As a result, the LED 40 is turned off and overheating is prevented.

  From the above description, it is apparent that the LED 40 of the present invention is disposed on the base board 20 and the overheat protection unit 30 has a heat conducting surface S that directly contacts the base board 20. became. If the LED 40 is overheated, the thermal energy can be transmitted to the base board 20 and then transmitted to the overheat protection unit 30, so that the overheat protection unit 30 can be heated quickly and directly, and the reaction time To prevent the LED 40 from overheating. Furthermore, the base board 20 is an insulator, and the first terminal 31 is welded to the base board 20 to form an independent and closed metal circuit. Therefore, the first terminal 31 can prevent a short circuit and can be quickly Heat transmission can be maintained.

  Up to now, the present inventors have shown and described various embodiments according to the present invention, but it is possible to provide further embodiments without departing from the scope of the present invention. However, it will be apparent to those skilled in the art.

DESCRIPTION OF SYMBOLS 10 Housing | casing 20 Base board 30 Overheating protection unit 30A Overheating protection unit 30B Overheating protection unit 31 1st terminal 32 2nd terminal 33 1st external terminal 34 2nd external terminal 35 Insulator 40 LED
311 Chamber 312 Opening 313 Convex surface portion 314 Insulator fixing member 321 First metal sheet 322 Second metal sheet

Claims (4)

A housing,
A baseboard disposed inside the housing;
An overheat protection unit having a heat conducting surface in contact with the baseboard;
At least one light emitting diode disposed within the base board and electrically connected to the overheat protection unit;
A first terminal having the heat conducting surface;
A second member formed by pressing together two metal sheets having different expansion coefficients, having one end fixed to an insulator fixing member and the other end pressed detachably against the first terminal. A terminal,
A first external terminal and a second external terminal;
With
The first terminal is
Inside thereof, a convex part that the other end of the second terminal is detachably pressed, and the insulator fixing member are disposed,
The opening is sealed with an insulator further included in the overheat protection unit.
A lamp with an overheat protection device, characterized by being formed in a chamber . The at least one light emitting diode is a plurality of light emitting diodes;
The lamp with overheat protection device according to claim 1, wherein the plurality of light emitting diodes are disposed on the base board. The first terminal is electrically connected to one end of the first external terminal;
The second terminal is electrically connected to one end of the second external terminal,
The other end of the first external terminal and the second external terminal, said at least one thermal protection device with lamp of claim 1, characterized in that it is electrically connected to the light emitting diode. The overheat protection unit further includes an insulator covering the first terminal and the second terminal,
The other end of the first external terminal or the other end of the second external terminal extends from the insulator and is electrically connected to the at least one light emitting diode. Item 2. A lamp with an overheat protection device according to Item 1 .

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