CN216625299U - Full-voltage linear LED driving surge protection circuit - Google Patents
Full-voltage linear LED driving surge protection circuit Download PDFInfo
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- CN216625299U CN216625299U CN202220048817.6U CN202220048817U CN216625299U CN 216625299 U CN216625299 U CN 216625299U CN 202220048817 U CN202220048817 U CN 202220048817U CN 216625299 U CN216625299 U CN 216625299U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a full-voltage linear LED driving surge protection circuit, relates to the technical field of LEDs, solves the problem of high surge suppression under a 100-132V input system, and has the technical scheme that: the LED lamp comprises a rectifier bridge DB1, a surge protection circuit for absorbing surge energy, a light emitting diode and an LED lamp driver; one input end of the rectifier bridge DB1 is connected with one end of the 100-265V alternating voltage, and the other input end of the rectifier bridge DB1 is connected with the other end of the 100-265V alternating voltage; the cathode of the light emitting diode is connected with one end of the LED lamp driver in series; the rectifier bridge DB1 is connected in parallel with the surge protection circuit, and then connected in parallel with the light emitting diode and the LED lamp driver which are connected in series. The utility model can automatically detect the input voltage and realize the opening of the protection device at low voltage. The surge suppression capability of 4KV or high-low voltage consistency can be achieved by inputting alternating current at low voltage of 100-170V.
Description
Technical Field
The utility model relates to the technical field of LEDs, in particular to a full-voltage linear LED driving surge protection circuit.
Background
The LED is the most common lighting lamp at present, and has the advantages of long service life, stable performance, low power consumption and convenient use.
In order to reduce the cost, more LED products adopt a linear driving mode; in order to meet the requirement of adapting to different input voltages, a full voltage LED driving scheme should be sounded. In the traditional linear method, in order to meet the surge requirement of 220V, the voltage of a voltage dependent resistor is selected to be more than 470V or 511V, and at the moment, the surge protection under a 120V power grid system is very fragile, so that the normal protection effect is difficult to play when the input surge reaches 4KV or more, and the equipment is damaged.
The lighting scheme with the lowest cost can be realized through full voltage linearity, in a 200-265V power grid system, high surge suppression capacity can be realized through high driving tube voltage resistance and 470V-level pressure-sensitive combination, but in a 100-132V input network, the worry of surge damage caused by lightning stroke is increased day by day.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a full-voltage linear LED driving surge protection circuit, which solves the problem of high surge suppression under a 100-132V input system and can realize surge protection in a full-voltage range of 100-240V.
The technical purpose of the utility model is realized by the following technical scheme:
a full-voltage linear LED driving surge protection circuit comprises a rectifier bridge DB1, a surge protection circuit used for absorbing surge energy, a light emitting diode and an LED lamp driver;
one input end of the rectifier bridge DB1 is connected with one end of the 100-265V alternating voltage, and the other input end of the rectifier bridge DB1 is connected with the other end of the 100-265V alternating voltage;
the cathode of the light emitting diode is connected with one end of the LED lamp driver in series;
the rectifier bridge DB1 is connected in parallel with the surge protection circuit, and then connected in parallel with the light emitting diode and the LED lamp driver which are connected in series.
According to the utility model, the surge protection circuit absorbing surge energy is inserted into the traditional circuit, when high voltage is input, the surge protection circuit can detect that the input power grid signal is high, and the surge protection circuit cuts off low voltage, so that the high voltage is ensured to work normally; when the low voltage is input, the surge protection circuit can detect that the input power grid signal is low, the surge protection circuit opens the low voltage, and the surge protection circuit absorbs surge energy within the low-voltage normal working voltage range to protect the later-stage work.
Furthermore, the surge protection circuit comprises a voltage detection circuit and a surge absorption circuit, and the output end of the voltage detection circuit is connected with the input end of the surge absorption circuit.
Further, the voltage detection circuit includes resistance R1, resistance R2 and comparator, the one end of resistance R1 is connected with rectifier bridge DB 1's voltage output end, the other end with the one end of resistance R2 and the negative pole of comparator are connected, rectifier bridge DB 1's earthing terminal is connected to the other end of resistance R2, the output of comparator with surge absorption circuit's input is connected, the comparator is equipped with the reference steady voltage value that is used for detecting input voltage.
Further, the reference stable voltage value is any value between 0.5 and 10V.
Further, the surge absorption circuit comprises a MOS drive, a MOS transistor Q1, a resistor R3, a resistor RX, a diode ZD1 and a resistor VR 3;
the output end of the voltage detection circuit is connected with the input end of the MOS drive;
one end of the resistor RX is connected with a voltage output end of the rectifier bridge DB1, the other end of the resistor RX is connected with one end of the resistor R3 and a drain electrode of the MOS transistor Q1, the other end of the resistor R3 is connected with a grid electrode of the MOS transistor Q1, an output end of an MOS drive and a cathode of the diode ZD1, and a source electrode of the MOS transistor Q1 is connected with an anode of the diode ZD1 and one end of the resistor VR 3.
Further, the other end of the resistor VR3 is connected to the ground terminal of the rectifier bridge DB 1.
Further, the diode ZD1 is a zener diode.
Further, the resistor VR3 is a voltage dependent resistor.
Further, the resistor RX is a current limiting resistor.
Further, the ground terminal of the rectifier bridge DB1 is connected to the other end of the LED lamp driver.
Compared with the prior art, the utility model has the following beneficial effects:
the surge absorption circuit composed of MOS drive and voltage dependent resistor is inserted into the traditional circuit, and the circuit is composed of a voltage detection circuit and a surge absorption circuit. When the high voltage is input, the detection circuit detects that the input power grid signal is high, the surge absorption circuit turns off MOS drive, and cuts off a low voltage absorption voltage dependent resistor loop to ensure that the high voltage works normally; when the voltage is input at low voltage, the detection circuit detects that the input power grid signal is low, the surge absorption circuit starts MOS drive, opens the voltage-sensitive loop with low-voltage absorption, absorbs surge energy within the range of low-voltage normal working voltage and protects the later-stage work.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
fig. 1 is a schematic circuit diagram according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit structure used in a linear LED driving according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit structure for use in any other wide voltage range according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a circuit structure used in any dc input range according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
It is to be understood that, furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example (b):
as shown in fig. 1, an embodiment of the present application provides a full-voltage linear LED driving surge protection circuit, which includes a rectifier bridge DB1, a surge protection circuit for absorbing surge energy, a light emitting diode, and an LED lamp driver;
one input end of the rectifier bridge DB1 is connected with one end of the 100-265V alternating voltage, and the other input end of the rectifier bridge DB1 is connected with the other end of the 100-265V alternating voltage;
the cathode of the light emitting diode is connected with one end of the LED lamp driver in series;
the rectifier bridge DB1 is connected in parallel with the surge protection circuit first, and then connected in parallel with the light emitting diode and the LED lamp driver connected in series.
Specifically, please refer to the circuit in the dashed line frame of fig. 1, the surge protection circuit of the present application is connected in parallel between the rectifier bridge DB1 and the light emitting diode and the LED lamp driver, and the surge protection circuit is connected in parallel between the two parts, so that the LED lamp driver can be protected when the input voltage is high or low, and it should be noted that the LED lamp driver refers to a driving circuit and is used for driving the LED lamp to normally operate.
In a further embodiment of the present application, the surge protection circuit includes a voltage detection circuit and a surge absorption circuit, and an output terminal of the voltage detection circuit is connected to an input terminal of the surge absorption circuit.
Specifically, the voltage detection circuit is used to detect the input voltage of the power grid, the surge absorption circuit protects the subsequent circuit according to the voltage value detected by the voltage detection circuit, the subsequent circuit, i.e. the above-mentioned LED lamp driver, can also be referred to as a driving circuit for driving the LED lamp to work,
in a further embodiment of the present application, the voltage detection circuit includes a resistor R1, a resistor R2, and a comparator, one end of the resistor R1 is connected to the voltage output terminal of the rectifier bridge DB1, the other end of the resistor R2 is connected to one end of the resistor R2 and a negative electrode of the comparator, the other end of the resistor R2 is connected to the ground terminal of the rectifier bridge DB1, an output terminal of the comparator is connected to an input terminal of the surge absorption circuit, and the comparator is provided with a reference regulated voltage value for detecting the input voltage.
Specifically, as shown in fig. 1, a voltage output end of the rectifier bridge DB1 is connected to one end of a resistor R1, a resistor R1 and a resistor R2 are connected in parallel to a negative electrode of the comparator U1A, a reference voltage regulator is provided at a positive electrode of the comparator U1A, the positive electrode is connected to a voltage source having VDD of 5-12V, and the negative electrode is grounded. The voltage detection circuit can detect the output voltage of the rectifier bridge DB1, and then sends the detected signal to the MOS drive of the surge protection circuit to complete the subsequent surge suppression.
In a further embodiment of the present application, the reference regulated voltage value is any value between 0.5 and 10V.
Specifically, the reference voltage stabilization value is generally 1.2V, which is suitable for detection of most voltages, and is mainly selected according to actual conditions.
In a further embodiment of the present application, the surge absorption circuit includes a MOS driver, a MOS transistor Q1, a resistor R3, a resistor RX, a diode ZD1, and a resistor VR 3;
the output end of the voltage detection circuit is connected with the input end of the MOS drive;
one end of the resistor RX is connected with a voltage output end of the rectifier bridge DB1, the other end of the resistor RX is connected with one end of the resistor R3 and a drain electrode of the MOS transistor Q1, the other end of the resistor R3 is connected with a grid electrode of the MOS transistor Q1, an output end of the MOS drive and a cathode of the diode ZD1, and a source electrode of the MOS transistor Q1 is connected with an anode of the diode ZD1 and one end of the resistor VR 3.
Specifically, the U1A transmits a signal to the MOS driver (or an output signal of another grid detection circuit) to output a low level to pull down the gate of the MOS transistor Q1, and turns off the circuit; when the input voltage is detected to be less than 170V, the detection circuit outputs high level or a resistor R3 drives the MOS transistor Q1 to be switched on, the resistor VR3 is connected with the switched-on MOS transistor Q1 in series, at the moment, surge voltage is limited by a resistor RX and then absorbed by a resistor VR3, and finally the effect of protecting a rear-stage circuit is achieved.
In a further embodiment of the present application, the other end of the resistor VR3 is connected to the ground terminal of the rectifier bridge DB 1.
Specifically, since the entire surge protection circuit is connected in parallel between the rectifier bridge DB1 and the LED and LED lamp driver, the resistor VR3 is eventually connected to the ground of the LED lamp driver and the rectifier bridge DB 1.
In a further embodiment of this embodiment of the present invention, the diode ZD1 is a zener diode.
In particular, the zener diode breaks down at the correct voltage, which makes it useful as a limiting or protection component, and the use of zener diodes is particularly suitable for surge protection circuits because zener diodes of various voltages are available.
In a further embodiment of the present application, the resistor VR3 is a voltage dependent resistor.
In particular, the piezoresistor is a voltage-limiting type protection device. By utilizing the nonlinear characteristic of the piezoresistor, when overvoltage appears between two poles of the piezoresistor, the piezoresistor can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of a post-stage circuit.
In a further embodiment of the present application, the resistor RX is a current limiting resistor.
Specifically, the resistor RX is a current limiting resistor for reducing the current at the load end, as shown in fig. 1, the current flowing through the light emitting diode can be reduced by adding a current limiting resistor RX at one end of the light emitting diode, so as to prevent the LED lamp from being damaged.
In a further embodiment of the present application, the ground terminal of the rectifier bridge DB1 is connected to the other end of the LED lamp driver.
Specifically, since the entire surge protection circuit is connected in parallel between the rectifier bridge DB1 and the light emitting diode and LED lamp driver, the LED lamp driver is also connected to the ground terminal of the rectifier bridge DB1 after being finally connected to the surge protection circuit.
By integrating the technical scheme, the surge protection circuit can automatically detect the input voltage and open the protection device at low voltage after being inserted into a circuit. After the surge protection circuit is added, the surge suppression capability of 4KV or high-low voltage consistency can be achieved even when 100-170V input alternating current is used.
The application can be applied to a linear dual-voltage and full-voltage LED lighting circuit, as shown in FIG. 2, namely, a surge protection circuit is used in linear LED driving; the power adapter can also be used for power adapters; the surge protection circuit can also be used in any power supply or lighting product with a wide voltage range, not limited to the AC input voltage, as shown in fig. 3, i.e. the surge protection circuit can be used in any other wide voltage range; the surge protection circuit can be further used for other power supply products such as surge protection of a direct current input wide power supply, and as shown in fig. 4, the surge protection circuit can be used in any direct current input range.
The core device of the surge protection circuit comprises a field effect transistor and a piezoresistor. In principle, the field effect tube can be replaced by other three-end controlled active devices such as a triode, an IGBT or a relay; the voltage-sensitive device can be replaced by voltage-sensitive sensor devices such as discharge tubes, TVSs and the like or other surge absorption devices.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A full-voltage linear LED driving surge protection circuit is characterized by comprising a rectifier bridge DB1, a surge protection circuit for absorbing surge energy, a light emitting diode and an LED lamp driver;
one input end of the rectifier bridge DB1 is connected with one end of the 100-265V alternating voltage, and the other input end of the rectifier bridge DB1 is connected with the other end of the 100-265V alternating voltage;
the cathode of the light emitting diode is connected with one end of the LED lamp driver in series;
the rectifier bridge DB1 is connected in parallel with the surge protection circuit, and then connected in parallel with the light emitting diode and the LED lamp driver which are connected in series.
2. A full voltage linear LED driving surge protection circuit according to claim 1, wherein the surge protection circuit comprises a voltage detection circuit and a surge absorption circuit, and an output terminal of the voltage detection circuit is connected to an input terminal of the surge absorption circuit.
3. A full-voltage linear LED driving surge protection circuit according to claim 2, wherein the voltage detection circuit comprises a resistor R1, a resistor R2 and a comparator, one end of the resistor R1 is connected with the voltage output end of the rectifier bridge DB1, the other end of the resistor R1 is connected with one end of the resistor R2 and the negative electrode of the comparator, the other end of the resistor R2 is connected with the ground end of the rectifier bridge DB1, the output end of the comparator is connected with the input end of the surge absorption circuit, and the comparator is provided with a reference regulated voltage value for detecting an input voltage.
4. A full voltage linear LED driving surge protection circuit according to claim 3, wherein the reference regulated voltage value is any value between 0.5-10V.
5. The full-voltage linear LED driving surge protection circuit according to claim 2, wherein the surge absorption circuit comprises a MOS driver, a MOS transistor Q1, a resistor R3, a resistor RX, a diode ZD1 and a resistor VR 3;
the output end of the voltage detection circuit is connected with the input end of the MOS drive;
one end of the resistor RX is connected with a voltage output end of the rectifier bridge DB1, the other end of the resistor RX is connected with one end of the resistor R3 and a drain electrode of the MOS transistor Q1, the other end of the resistor R3 is connected with a grid electrode of the MOS transistor Q1, an output end of an MOS drive and a cathode of the diode ZD1, and a source electrode of the MOS transistor Q1 is connected with an anode of the diode ZD1 and one end of the resistor VR 3.
6. A full-voltage linear LED driving surge protection circuit according to claim 5, wherein the other end of the resistor VR3 is connected to the ground terminal of the rectifier bridge DB 1.
7. A full voltage linear LED driving surge protection circuit according to claim 5, wherein said diode ZD1 is a zener diode.
8. A full voltage linear LED driving surge protection circuit according to claim 5, wherein said resistor VR3 is a voltage dependent resistor.
9. A full voltage linear LED driving surge protection circuit according to claim 5, wherein said resistor RX is a current limiting resistor.
10. A full-voltage linear LED driving surge protection circuit according to claim 1, wherein a ground terminal of the rectifier bridge DB1 is connected to the other end of the LED lamp driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220048817.6U CN216625299U (en) | 2022-01-10 | 2022-01-10 | Full-voltage linear LED driving surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220048817.6U CN216625299U (en) | 2022-01-10 | 2022-01-10 | Full-voltage linear LED driving surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216625299U true CN216625299U (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220048817.6U Active CN216625299U (en) | 2022-01-10 | 2022-01-10 | Full-voltage linear LED driving surge protection circuit |
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|---|---|
| CN (1) | CN216625299U (en) |
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- 2022-01-10 CN CN202220048817.6U patent/CN216625299U/en active Active
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