CN110839306A - Large-scale lamps and lanterns excess temperature protection device and LED lamps and lanterns - Google Patents
Large-scale lamps and lanterns excess temperature protection device and LED lamps and lanterns Download PDFInfo
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- CN110839306A CN110839306A CN201911389776.6A CN201911389776A CN110839306A CN 110839306 A CN110839306 A CN 110839306A CN 201911389776 A CN201911389776 A CN 201911389776A CN 110839306 A CN110839306 A CN 110839306A
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- 238000005286 illumination Methods 0.000 claims abstract description 18
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- 230000005669 field effect Effects 0.000 claims description 10
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Abstract
Large-scale lamps and lanterns excess temperature protection device and LED lamps and lanterns relate to LED illumination lamps and lanterns technical field, solve that current LED lamps and lanterns excess temperature protection circuit exists and lack the flexibility, and the control precision is poor, can not satisfy high-power lamps and lanterns excess temperature protection, and ordinary excess temperature protection circuit is the direct turn-off output, and lamps and lanterns can not throw light on under the protection state, and it is not enough to influence techniques such as normal illumination application, including: the switch short circuit, the temperature control circuit and the constant voltage power supply circuit; wherein: the switch short circuit is used for being connected with more than one LED lamp in the LED lamp lighting modules which are connected in series in parallel; and the temperature control circuit is used for sensing the temperature in the LED lamp lighting module and controlling the on/off of the switch short circuit. The LED lamps connected in parallel are in short circuit through the switch short circuit, so that part of the LED lamps on the light source plate temporarily stop working, the temperature control is accurate, and the temperature reduction is automatically recovered; the over-temperature protection device has the advantages of low cost, small volume and flexible application, and is particularly suitable for over-temperature protection of large-scale lamps.
Description
Technical Field
The invention relates to the technical field of LED lighting lamps, in particular to the improvement of an over-temperature protection circuit of a large-scale LED lamp.
Background
At present, three over-temperature protection circuits are available in the market, and the first is to directly turn off the output when the temperature reaches a set value, namely to turn off the lamp; the second is that when the temperature reaches the set value, the power is reduced by half, namely half bright; the third is to slowly decrease the power, i.e. dim, when the temperature reaches the set value. The three circuits are integrated in the power supply and are widely applied to the lamps with medium and small power below 20W, and the lamps with large power above 20W are generally separated from the power supply, so that the over-temperature protection circuits in the three modes cannot accurately detect and protect the lamps from abnormal work due to overhigh temperature in severe environment, and cannot meet the over-temperature protection application of the high-power lamps.
Disclosure of Invention
In summary, the present invention aims to solve the technical deficiencies that the conventional over-temperature protection circuit for an LED lamp lacks flexibility, has poor control accuracy, cannot satisfy the over-temperature protection for a high-power lamp, has a direct output shutdown function in a common over-temperature protection circuit, cannot illuminate in a protected state, and affects normal illumination applications, and the like, and provides an over-temperature protection device for a large-scale lamp and an LED lamp.
In order to solve the technical problem provided by the invention, the technical scheme is as follows:
the over-temperature protection device for the large lamp is characterized by comprising: the switch short circuit, the temperature control circuit and the constant voltage power supply circuit; wherein:
the switch short circuit is used for being connected with more than one LED lamp in the LED lamp lighting modules in series in parallel and controlling short circuit of part of the LED lamps in the LED lamp lighting modules in series;
the temperature control circuit is used for sensing the temperature in the LED lamp lighting module and controlling the on/off of the switch short circuit;
and the constant voltage power supply circuit is used for providing a working power supply for the temperature control circuit.
The technical scheme for further limiting the invention comprises the following steps:
the switch short circuit is a field effect transistor switch circuit driven by the temperature control circuit to be conducted.
The temperature control circuit comprises a temperature sensor for sensing the temperature of the LED lamp illumination module and a triode control circuit which is driven by the resistance value change of the temperature sensor to control the switch short circuit to be switched on or switched off.
The constant voltage power supply circuit is connected in parallel with the temperature control circuit through a voltage stabilizing diode.
An LED lamp comprises an LED lamp illumination module with more than two LED lamps connected in series and an LED driving power supply for providing constant current for the LED lamp illumination module; the method is characterized in that: the lamp over-temperature protection device also comprises more than one group of lamp over-temperature protection devices; the switch short circuit of the lamp over-temperature protection device is connected with more than one LED lamp in the LED lamp lighting module in parallel; the temperature sensor of the temperature control circuit is arranged on the light source plate of the LED lamp illumination module; and a constant voltage power supply circuit of the lamp over-temperature protection device is connected with the LED lamp lighting module to get electricity.
The invention has the beneficial effects that: the over-temperature protection circuit is applied to the light source board, and after the temperature reaches a set value, the LED lamps connected in parallel are in short circuit through the switch short circuit, so that part of the LED lamps on the light source board stop working temporarily, the temperature control is accurate, and the temperature reduction is recovered automatically; the over-temperature protection device has the advantages of low cost, small volume and flexible application, and is particularly suitable for over-temperature protection of large-scale lamps.
Drawings
FIG. 1 is a schematic diagram of the circuit of the present invention;
fig. 2 is a schematic circuit diagram of another embodiment of the present invention.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and preferred embodiments of the present invention.
With reference to the specific circuit schematic diagram shown in fig. 1, the over-temperature protection device for a large lamp of the present invention comprises: the switch short circuit, the temperature control circuit and the constant voltage power supply circuit; wherein:
the switch short circuit is used for being connected with more than one LED lamp in the LED lamp lighting modules in series in parallel and controlling short circuit of part of the LED lamps in the LED lamp lighting modules in series; the switch short circuit can be a field effect transistor switch circuit driven by the temperature control circuit to be conducted. For example: the four LED lamps LED1, LED2, LED3 and LED4 are connected in series to form an LED lamp illumination module, a field effect tube Q4 forming a field effect tube switching circuit is connected with one LED2 in parallel, when the field effect tube Q4 is conducted, the LED2 is extinguished by short circuit of the field effect tube Q4, the LED lamp illumination module adopts a constant-current LED driving power supply to supply power, after the LED2 is extinguished, the power of the whole lamp is correspondingly reduced, the heating value is correspondingly reduced, and the over-temperature protection effect is achieved.
The temperature control circuit is used for sensing the temperature in the light source board of the LED lamp illumination module and controlling the on/off of the switch short circuit; the temperature control circuit comprises a temperature sensor RT1 for sensing the temperature of the LED lamp illumination module and a triode control circuit which is driven by the resistance value change of the temperature sensor to control the switch short circuit to be switched on or switched off. The triode control circuit can be a two-stage control circuit formed by a triode Q5 and a triode Q3. The LED2 lamp normally works, when the temperature sensor RT1 does not reach the design temperature, the resistance value of the temperature sensor RT1 is relatively large, the triode Q5 and the triode Q3 are not biased to be cut off, the field-effect transistor Q4 does not have a switching-on voltage and is in a cut-off state, the LED2 lamp is on, and the over-temperature protection circuit does not work; when the temperature rises to reach the design temperature, the resistance value of the temperature sensor RT1 is reduced, the triode Q5 is firstly conducted, the triode Q5 is conducted and then provides a downward bias for the triode Q3, so that the triode Q3 is conducted, after the triode Q3 is conducted, a starting voltage is provided for the grid electrode of the field-effect tube Q4 through the resistor R3, the field-effect tube Q4 is conducted, the LED2 is turned off, and the over-temperature protection circuit is started to work. In order to provide hysteresis for the conduction of the transistor Q5, and play a role in stabilizing the circuit and accurately controlling the circuit, the circuit also comprises a hysteresis circuit which is connected with and controls the conduction or disconnection of the hysteresis of the transistor Q5, and the hysteresis circuit mainly comprises a transistor Q6.
The constant voltage power supply circuit is used for providing a working power supply for the temperature control circuit; the constant voltage power supply circuit is connected in parallel with the temperature control circuit through a voltage stabilizing diode. Specifically, the resistor R1, the resistor R2, the transistor Q1, the transistor Q2, and the zener diode ZD1 form the constant voltage power supply circuit, and the constant voltage power supply circuit is supplied with a constant operating voltage by the zener diode ZD 1.
The LED lamp comprises an LED lamp illumination module with more than two LED lamps connected in series and an LED driving power supply for providing constant current for the LED lamp illumination module; the lamp over-temperature protection device also comprises more than one group of lamp over-temperature protection devices; the switch short circuit of the lamp over-temperature protection device is connected with more than one LED lamp in the LED lamp lighting module in parallel; the temperature sensor of the temperature control circuit is arranged on the light source plate of the LED lamp illumination module; and a constant voltage power supply circuit of the lamp over-temperature protection device is connected with the LED lamp lighting module to get electricity.
Referring to fig. 2, when the number of LED lamps connected in series to one group of LED lamp lighting modules is large, a plurality of lamp over-temperature protection devices are used to connect different LED lamps in parallel, and the corresponding LED lamps are controlled to be turned off according to temperature variation values at different positions, so that the power of the whole lamp is correspondingly reduced, the heat productivity is correspondingly reduced, and an over-temperature protection effect is achieved.
Claims (5)
1. The over-temperature protection device for the large lamp is characterized by comprising: the switch short circuit, the temperature control circuit and the constant voltage power supply circuit; wherein:
the switch short circuit is used for being connected with more than one LED lamp in the LED lamp lighting modules in series in parallel and controlling short circuit of part of the LED lamps in the LED lamp lighting modules in series;
the temperature control circuit is used for sensing the temperature in the LED lamp lighting module and controlling the on/off of the switch short circuit;
and the constant voltage power supply circuit is used for providing a working power supply for the temperature control circuit.
2. The large-scale lamp over-temperature protection device according to claim 1, wherein: the switch short circuit is a field effect transistor switch circuit driven by the temperature control circuit to be conducted.
3. The large-scale lamp over-temperature protection device according to claim 1, wherein: the temperature control circuit comprises a temperature sensor for sensing the temperature of the LED lamp illumination module and a triode control circuit which is driven by the resistance value change of the temperature sensor to control the switch short circuit to be switched on or switched off.
4. The large-scale lamp over-temperature protection device according to claim 1, wherein: the constant voltage power supply circuit is connected in parallel with the temperature control circuit through a voltage stabilizing diode.
5. An LED lamp comprises an LED lamp illumination module with more than two LED lamps connected in series and an LED driving power supply for providing constant current for the LED lamp illumination module; the method is characterized in that: the lamp over-temperature protection device further comprises a group of lamp over-temperature protection devices as set forth in any one of the preceding claims 1 to 4; the switch short circuit of the lamp over-temperature protection device is connected with more than one LED lamp in the LED lamp lighting module in parallel; the temperature sensor of the temperature control circuit is arranged on the light source plate of the LED lamp illumination module; and a constant voltage power supply circuit of the lamp over-temperature protection device is connected with the LED lamp lighting module to get electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911389776.6A CN110839306A (en) | 2019-12-30 | 2019-12-30 | Large-scale lamps and lanterns excess temperature protection device and LED lamps and lanterns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911389776.6A CN110839306A (en) | 2019-12-30 | 2019-12-30 | Large-scale lamps and lanterns excess temperature protection device and LED lamps and lanterns |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110839306A true CN110839306A (en) | 2020-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911389776.6A Pending CN110839306A (en) | 2019-12-30 | 2019-12-30 | Large-scale lamps and lanterns excess temperature protection device and LED lamps and lanterns |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110839306A (en) |
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2019
- 2019-12-30 CN CN201911389776.6A patent/CN110839306A/en active Pending
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Country or region after: China Address after: 518000 buildings a, B, C and D, No.10 huanping Road, Gaoqiao community, Pingdi street, Longgang District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Yufu Lighting Co.,Ltd. Address before: 518000 buildings a, B, C and D, No.10 huanping Road, Gaoqiao community, Pingdi street, Longgang District, Shenzhen City, Guangdong Province Applicant before: Shenzhen Eastfield Lighting Co.,Ltd. Country or region before: China |