CN105979636A - Mains supply overvoltage protection system for LEDs - Google Patents
Mains supply overvoltage protection system for LEDs Download PDFInfo
- Publication number
- CN105979636A CN105979636A CN201610424687.0A CN201610424687A CN105979636A CN 105979636 A CN105979636 A CN 105979636A CN 201610424687 A CN201610424687 A CN 201610424687A CN 105979636 A CN105979636 A CN 105979636A
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- China
- Prior art keywords
- pole
- audion
- diode
- pin
- electric capacity
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a mains supply overvoltage protection system for LEDs, characterized by mainly comprising a transformer T, a control chip U3, a three-terminal voltage regulator chip U2, a switch circuit connected with an OUT pin of the control chip U3, a resistor R4 connected in series between a CONT pin of the control chip U3 and the switch circuit, a rectification filter circuit connected with the transformer T, a trigger circuit connected with the rectification filter circuit, and a diode D4 with a P electrode being connected with the trigger circuit and an N electrode being connected with a TRIG pin of the control chip U3. Through combining an NE555 integrated chip with corresponding peripheral circuits and smartly using the switch function of a transistor, the mains supply overvoltage protection system for LEDs, as compared with a traditional overvoltage protection system, is improved in sensitivity by 30%, thereby being capable of effectively performing overvoltage protection to LEDs.
Description
Technical field
The present invention relates to a kind of overvoltage protective system, specifically refer to a kind of LED mains supply over-voltage and protect system.
Background technology
At present, due to LED have that energy consumption is low, the feature such as length in service life and safety and environmental protection, it is
Become one of main product of people's life lighting.Employing overvoltage protection system is typically required when LED operation
It is protected by system, it is to avoid LED is damaged by overvoltage produced by power network fluctuation.But, current institute
The sensitivity of the overvoltage protective system used is relatively low, it is impossible to when overvoltage produces, LED is carried out by the very first time
Protection, it is impossible to meet the requirement of people.
Summary of the invention
It is an object of the invention to the defect overcoming traditional overvoltage protective system sensitivity relatively low, it is provided that a kind of
LED mains supply over-voltage protects system.
The purpose of the present invention is achieved through the following technical solutions: a kind of LED mains supply over-voltage protects system, main
Will be by transformator T, control chip U3, three-terminal voltage-stabilizing chip U2, with the OUT pin of control chip U3
The on-off circuit being connected, is serially connected in the resistance between CONT pin and the on-off circuit of control chip U3
R4, the current rectifying and wave filtering circuit being connected with transformator T-phase, the triggering circuit being connected with current rectifying and wave filtering circuit, P
Pole and the triggering diode D4 that circuit is connected, N pole is then connected with the TRIG pin of control chip U3,
And positive pole is connected with the colelctor electrode of audion VT3, negative pole after resistance R3 with control chip U3's
The electric capacity C4 composition that THRE pin is connected；The IN pin of described three-terminal voltage-stabilizing chip U2 and triggering circuit
Be connected, its OUT pin is connected with RE pin and the VCC pin of control chip U3 the most respectively, it
GND pin ground connection.
Further, described current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1；Described two
The cathode output end of pole pipe commutator U1 is connected with the negative pole of electric capacity C1, its cathode output end then with electric capacity
The positive pole of C1 is connected；The input of described diode rectifier U1 then with the secondary inductance line of transformator T
The Same Name of Ends of circle is connected with non-same polarity, its cathode output end also with the former limit inductance coil of transformator T
Non-same polarity is connected；The positive pole of described electric capacity C1 is all connected with triggering circuit with negative pole.
Described triggering circuit is by audion VT1, audion VT2, audion VT3, N pole and electric capacity C1
The diode D1 that negative pole is connected, P pole then emitter stage with audion VT1 is connected, positive pole and three poles
The electric capacity C2 that the emitter stage of pipe VT1 is connected, negative pole then base stage with audion VT3 is connected, concatenation
Resistance R1 between the emitter stage and the base stage of audion VT3 of audion VT2, positive pole and audion VT3
Electric capacity C3, the P pole that emitter stage is connected, negative pole is then connected with the N pole of diode D1 and audion
The diode D3 that the colelctor electrode of VT2 is connected, N pole then colelctor electrode with audion VT3 is connected,
The diode that N pole is connected with the positive pole of electric capacity C1, P pole then colelctor electrode with audion VT2 is connected
D2, and the resistance R2 composition being serially connected between the N pole of diode D2 and the N pole of diode D3；Institute
The IN pin stating three-terminal voltage-stabilizing chip U2 is then connected with the N pole of diode D2；Described audion VT1
Base stage be connected with the positive pole of electric capacity C1, its colelctor electrode then base stage with audion VT2 is connected；Institute
The N pole of the GND pin and diode D1 of stating control chip U3 is connected；The N of described diode D1
Pole CONT pin with control chip U3 after resistance R4 is connected；The current collection of described audion VT3
Pole is connected with the N pole of diode D4 and the positive pole of electric capacity C4 the most respectively.
Described on-off circuit, by bidirectional thyristor D5, is serially connected in the control pole of bidirectional thyristor D5 and controls core
Resistance R5 between the OUT pin of sheet U3, positive pole is connected with the second plate of bidirectional thyristor D5,
Negative pole be then connected with the N pole of diode D1 while the electric capacity C5 of ground connection, and one end and two-way brilliant lock
The first anode of pipe D5 is connected, the other end then Same Name of Ends with the former limit inductance coil of transformator T is connected
Resistance R6 composition.
Described control chip U3 is the integrated chip of NE555, and three-terminal voltage-stabilizing chip U2 is 7815 integrated chips.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) present invention uses the integrated chip of NE555 and corresponding peripheral circuit to combine, and utilizes cleverly
The switching function of transistor, makes present invention sensitivity enhancement 30% compared with traditional overvoltage protective system,
Such that it is able to effectively LED is carried out overvoltage protection.
(2) present invention can cut off the electricity supply when line voltage exceedes higher limit and make LED not work, and works as electricity
Net voltage recloses power supply when recovering normal makes LED again light, such that it is able to protection LED is not by the most electric
Crushing is bad.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by transformator T, control chip U3, three-terminal voltage-stabilizing chip U2, with
The on-off circuit that the OUT pin of control chip U3 is connected, is serially connected in the CONT pipe of control chip U3
Resistance R4 between foot and on-off circuit, the current rectifying and wave filtering circuit being connected with transformator T-phase, with rectifying and wave-filtering
The triggering circuit that circuit is connected, P pole with trigger circuit be connected, N pole then with the TRIG of control chip U3
The diode D4 that pin is connected, and positive pole is connected with the colelctor electrode of audion VT3, negative pole is through resistance
The electric capacity C4 composition being connected with the THRE pin of control chip U3 after R3.Described three-terminal voltage-stabilizing chip
The IN pin of U2 with trigger that circuit is connected, its OUT pin is managed with the RE of control chip U3 the most respectively
Foot is connected with VCC pin, its GND pin ground connection.The former limit inductance coil of described transformator T same
Name end and non-same polarity then connect civil power.In order to preferably implement the present invention, described control chip U3 is preferred
The integrated chip of NE555, the integrated chip of three-terminal voltage-stabilizing chip U2 the most preferably 7815 realizes.
Wherein, this current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1.Described diode is whole
The cathode output end of stream device U1 is connected with the negative pole of electric capacity C1, its cathode output end is then with electric capacity C1's
Positive pole is connected.The input of described diode rectifier U1 then same with the secondary inductance coil of transformator T
Name end is connected with non-same polarity, its cathode output end also non-of the same name with the former limit inductance coil of transformator T
End is connected.The positive pole of described electric capacity C1 is all connected with triggering circuit with negative pole.
It addition, described triggering circuit is by audion VT1, audion VT2, audion VT3, resistance R1,
Resistance R2, diode D1, diode D2, diode D3, electric capacity C2 and electric capacity C3 form.
During connection, the N pole of diode D1 is connected with the negative pole of electric capacity C1, its P pole then with audion
The emitter stage of VT1 is connected.The positive pole of electric capacity C2 is connected with the emitter stage of audion VT1, its negative pole
Then the base stage with audion VT3 is connected.Resistance R1 is serially connected in emitter stage and the audion of audion VT2
Between the base stage of VT3.The positive pole of electric capacity C3 is connected with the emitter stage of audion VT3, its negative pole then with
The N pole of diode D1 is connected.The P pole of diode D3 is connected with the colelctor electrode of audion VT2,
Its N pole then colelctor electrode with audion VT3 is connected.The N pole of diode D2 and the positive pole of electric capacity C1
Be connected, its P pole then colelctor electrode with audion VT2 is connected.Resistance R2 is serially connected in diode D2's
Between the N pole of N pole and diode D3.
The IN pin of described three-terminal voltage-stabilizing chip U2 is then connected with the N pole of diode D2.Described three poles
The base stage of pipe VT1 is connected with the positive pole of electric capacity C1, its colelctor electrode then base stage with audion VT2 is connected
Connect.The GND pin of described control chip U3 is connected with the N pole of diode D1.Described diode D1
N pole CONT pin with control chip U3 after resistance R4 be connected；Described audion VT3's
Colelctor electrode is connected with the N pole of diode D4 and the positive pole of electric capacity C4 the most respectively.
Described on-off circuit is made up of bidirectional thyristor D5, resistance R5, resistance R6 and electric capacity C5.Even
When connecing, resistance R5 is serially connected between control pole and the OUT pin of control chip U3 of bidirectional thyristor D5.
The positive pole of electric capacity C5 is connected with the second plate of bidirectional thyristor D5, its negative pole is then with diode D1's
N pole be connected while ground connection.One end of resistance R6 is connected with the first anode of bidirectional thyristor D5,
Its other end then Same Name of Ends with the former limit inductance coil of transformator T is connected.LED then with resistance R6 phase
In parallel.
During work, the present invention cuts off the electricity supply when line voltage exceedes higher limit and makes LED not work, and works as electrical network
Voltage recloses power supply when recovering normal makes LED again light, such that it is able to protection LED is not by overvoltage
Damage.The present invention uses the integrated chip of NE555 and corresponding peripheral circuit to combine, and make use of cleverly
The switching function of transistor, makes present invention sensitivity enhancement 30% compared with traditional overvoltage protective system,
Such that it is able to effectively LED is carried out overvoltage protection.
As it has been described above, just can well realize the present invention.
Claims (5)
1. a LED mains supply over-voltage protects system, it is characterised in that mainly by transformator T, controls core
Sheet U3, three-terminal voltage-stabilizing chip U2, the on-off circuit being connected with the OUT pin of control chip U3, string
It is connected on the resistance R4 between CONT pin and the on-off circuit of control chip U3, is connected with transformator T-phase
Current rectifying and wave filtering circuit, the triggering circuit being connected with current rectifying and wave filtering circuit, P pole with trigger circuit be connected,
The diode D4 that N pole is then connected with the TRIG pin of control chip U3, and positive pole and audion VT3
The electric capacity that colelctor electrode is connected, negative pole is connected with the THRE pin of control chip U3 after resistance R3
C4 forms；The IN pin of described three-terminal voltage-stabilizing chip U2 with trigger circuit be connected, its OUT pin then
Be connected with RE pin and the VCC pin of control chip U3 respectively, its GND pin ground connection.
A kind of LED mains supply over-voltage the most according to claim 1 protects system, it is characterised in that
Described current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1；Described diode rectifier U1
Cathode output end be connected with the negative pole of electric capacity C1, its cathode output end then positive pole with electric capacity C1 is connected
Connect；The input of described diode rectifier U1 then with the Same Name of Ends of the secondary inductance coil of transformator T and non-
Same Name of Ends is connected, its cathode output end also non-same polarity with the former limit inductance coil of transformator T is connected；
The positive pole of described electric capacity C1 is all connected with triggering circuit with negative pole.
A kind of LED mains supply over-voltage the most according to claim 2 protects system, it is characterised in that
Described triggering circuit is by the negative pole of audion VT1, audion VT2, audion VT3, N pole and electric capacity C1
Be connected, diode D1 that P pole then emitter stage with audion VT1 is connected, positive pole and audion VT1
The electric capacity C2 that emitter stage is connected, negative pole then base stage with audion VT3 is connected, be serially connected in audion
The transmitting of the resistance R1 between emitter stage and the base stage of audion VT3 of VT2, positive pole and audion VT3
Electric capacity C3, the P pole that pole is connected, negative pole is then connected with the N pole of diode D1 and audion VT2
Diode D3, the N pole that colelctor electrode is connected, N pole then colelctor electrode with audion VT3 is connected and electricity
Hold the diode D2 that positive pole is connected, P pole then colelctor electrode with audion VT2 is connected of C1, and
The resistance R2 composition being serially connected between the N pole of diode D2 and the N pole of diode D3；Described three ends are steady
The IN pin of pressure chip U2 is then connected with the N pole of diode D2；The base stage of described audion VT1 with
The positive pole of electric capacity C1 is connected, its colelctor electrode then base stage with audion VT2 is connected；Described control core
The GND pin of sheet U3 is connected with the N pole of diode D1；The N pole of described diode D1 is through resistance
After R4, the CONT pin with control chip U3 is connected；The colelctor electrode of described audion VT3 the most respectively with
The N pole of diode D4 is connected with the positive pole of electric capacity C4.
A kind of LED mains supply over-voltage the most according to claim 3 protects system, it is characterised in that
Described on-off circuit, by bidirectional thyristor D5, is serially connected in control pole and the control chip U3 of bidirectional thyristor D5
OUT pin between resistance R5, positive pole is connected with the second plate of bidirectional thyristor D5, negative pole then
The electric capacity C5 of ground connection while being connected with the N pole of diode D1, and one end and bidirectional thyristor D5
The electricity that the first anode is connected, the other end then Same Name of Ends with the former limit inductance coil of transformator T is connected
Resistance R6 composition.
A kind of LED mains supply over-voltage the most according to claim 4 protects system, it is characterised in that
Described control chip U3 is the integrated chip of NE555, and three-terminal voltage-stabilizing chip U2 is 7815 integrated chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610424687.0A CN105979636A (en) | 2016-06-14 | 2016-06-14 | Mains supply overvoltage protection system for LEDs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610424687.0A CN105979636A (en) | 2016-06-14 | 2016-06-14 | Mains supply overvoltage protection system for LEDs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105979636A true CN105979636A (en) | 2016-09-28 |
Family
ID=57021862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610424687.0A Pending CN105979636A (en) | 2016-06-14 | 2016-06-14 | Mains supply overvoltage protection system for LEDs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105979636A (en) |
-
2016
- 2016-06-14 CN CN201610424687.0A patent/CN105979636A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160928 |