CN105977902A - Voltage comparison circuit based mains supply overvoltage protection system for LED - Google Patents
Voltage comparison circuit based mains supply overvoltage protection system for LED Download PDFInfo
- Publication number
- CN105977902A CN105977902A CN201610417216.7A CN201610417216A CN105977902A CN 105977902 A CN105977902 A CN 105977902A CN 201610417216 A CN201610417216 A CN 201610417216A CN 105977902 A CN105977902 A CN 105977902A
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- Prior art keywords
- pole
- audion
- electric capacity
- diode
- circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- 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 voltage comparison circuit based mains supply overvoltage protection system for an LED. The voltage comparison circuit based mains supply overvoltage protection system is characterized by mainly comprising a transformer T, a control chip U3, a three-terminal voltage-stabilizing chip U2, a switching circuit which is connected with the control chip U3, a resistor R4 which is connected between the CONT pin of the control chip U3 and the switching circuit in series, a rectification filter circuit which is connected with the transformer T, a trigger circuit which is connected with the rectification filter circuit, a diode D4, and the like, wherein the P pole of the diode D4 is connected with the trigger circuit while the N pole of the diode D4 is connected with the TRIG pin of the control chip U3. By adoption of the voltage comparison circuit based mains supply overvoltage protection system, the input voltage and the set upper limit voltage can be accurately compared, so that the judgment accuracy of the voltage comparison circuit based mains supply overvoltage protection system is effectively improved, and a phenomenon of wrong judgment of the voltage comparison circuit based mains supply overvoltage protection system is avoided.
Description
Technical field
The present invention relates to a kind of overvoltage protective system, specifically refer to a kind of LED based on voltage comparator circuit and use
Mains supply over-voltage protection 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 based on voltage comparator circuit protects system.
The purpose of the present invention is achieved through the following technical solutions: a kind of LED city based on voltage comparator circuit
Electricity overvoltage protective system, mainly by transformator T, control chip U3, three-terminal voltage-stabilizing chip U2, with control core
The on-off circuit that sheet U3 is connected, is serially connected between CONT pin and the on-off circuit of control chip U3
Resistance R4, the current rectifying and wave filtering circuit being connected with transformator T-phase, the triggering being connected with current rectifying and wave filtering circuit electricity
Road, P pole and triggering two poles that circuit is connected, N pole is then connected with the TRIG pin of control chip U3
Pipe D4, positive pole is connected with the colelctor electrode of audion VT3, negative pole after resistance R3 with control chip U3
The electric capacity C4 that is connected of THRE pin, and be serially connected in the electricity triggered between circuit and control chip U3
Pressure comparison circuit composition；The IN pin of described three-terminal voltage-stabilizing chip U2 is connected with triggering circuit, its OUT
Pin is connected with RE pin and the VCC pin of control chip U3 the most respectively, its GND pin ground connection.
Further, described voltage comparator circuit is by audion VT4, audion VT5, amplifier P, negative
Pole is connected with the base stage of audion VT4, positive pole as the electric capacity C6 of the input of this voltage comparator circuit,
N pole is connected with the positive pole of amplifier P, P pole base stage with audion VT4 after resistance R7 is connected
Diode D6, the resistance R8 being serially connected between the P pole of diode D6 and the colelctor electrode of audion VT4,
Positive pole is connected with the emitter stage of audion VT4, the electric capacity C7 of minus earth, is serially connected in audion VT5
Emitter stage and the negative pole of electric capacity C7 between resistance R9, be serially connected in negative pole and the electric capacity C7 of amplifier P
Negative pole between resistance R10, positive pole is connected with the N pole of diode D6, negative pole and audion VT5
Electric capacity C8, the P pole that is connected of colelctor electrode be connected with the colelctor electrode of audion VT5, N pole then with amplification
The diode D7 that the negative pole of device P is connected, and it is serially connected in the electricity between positive pole and the outfan of amplifier P
Resistance R11 composition；The base stage of described audion VT5 is connected with the emitter stage of audion VT4；Described electric capacity
The negative pole of C7 is connected with the outfan of amplifier P；The outfan of described amplifier P is as this voltage ratio relatively
The outfan of circuit is also connected with the GND pin of control chip U3；The input of described voltage comparator circuit
End is then connected with triggering circuit.
Described current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1；Described diode rectifier
The cathode output end of U1 is connected with the negative pole of electric capacity C1, its cathode output end then with the positive pole phase of electric capacity C1
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 polarity is connected, its cathode output end also non-same polarity with the former limit inductance coil of transformator T is connected
Connect；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 is connected with the input of voltage comparator circuit；The colelctor electrode of described audion VT3 the most respectively with diode
The N pole of D4 is connected with the positive pole of electric capacity C4.
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 GND pin of control chip U3 while the electric capacity C5 of ground connection, and one end is with double
The first anode to IGCT D5 is connected, the other end then with the Same Name of Ends of the former limit inductance coil of transformator T
The resistance R6 composition being connected；The negative pole of described electric capacity C5 after resistance R4 with the CONT of control chip U3
Pin is connected.
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.
(3) upper voltage limit of input voltage with setting can be compared by the present invention accurately, thus greatly
The judgement precision that improve the present invention, make the present invention not have the existing picture of erroneous judgement.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the voltage comparator circuit 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 control chip U3 is connected, is serially connected in CONT pin and the on-off circuit of control chip U3
Between resistance R4, the current rectifying and wave filtering circuit being connected with transformator T-phase, be connected with current rectifying and wave filtering circuit
Triggering circuit, circuit is connected, N pole is then connected with the TRIG pin of control chip U3 with triggering in P pole
Diode D4, positive pole is connected with the colelctor electrode of audion VT3, negative pole after resistance R3 with control core
The electric capacity C4 that the THRE pin of sheet U3 is connected, and be serially connected in triggering circuit and control chip U3 it
Between voltage comparator circuit composition；The IN pin of described three-terminal voltage-stabilizing chip U2 with trigger circuit be connected,
Its OUT pin is connected with RE pin and the VCC pin of control chip U3 the most respectively, its GND pipe
Foot ground connection.In order to preferably implement the present invention, the described control chip U3 integrated chip of preferred NE555, and
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 be connected with the input of voltage comparator circuit；The colelctor electrode of described audion VT3 is the most respectively with two
The N pole of pole pipe D4 is connected with the positive pole of electric capacity C4.
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 then with control chip U3
GND pin be connected while ground connection.One end of resistance R6 and the first anode of bidirectional thyristor D5
Be connected, its other end then Same Name of Ends with the former limit inductance coil of transformator T is connected.LED then with electricity
Resistance R6 is in parallel.The negative pole of described electric capacity C5 is also managed with the CONT of control chip U3 after resistance R4
Foot is connected.
As in figure 2 it is shown, this voltage comparator circuit is by audion VT4, audion VT5, amplifier P, electricity
Resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, diode D6, diode D7, electricity
Hold C6, electric capacity C7 and electric capacity C8 composition.
During connection, the negative pole of electric capacity C6 is connected with the base stage of audion VT4, its positive pole is as this voltage
The input of comparison circuit is also connected with the N pole of diode D1.The N pole of diode D6 and amplifier P
Positive pole be connected, its P pole base stage with audion VT4 after resistance R7 is connected.Resistance R8 concatenates
Between the P pole and the colelctor electrode of audion VT4 of diode D6.The positive pole of electric capacity C7 and audion VT4
Emitter stage be connected, its minus earth.Resistance R9 is serially connected in emitter stage and the electric capacity C7 of audion VT5
Negative pole between.Resistance R10 is serially connected between the negative pole of amplifier P and the negative pole of electric capacity C7.Electric capacity C8
Positive pole be connected with the N pole of diode D6, its negative pole is connected with the colelctor electrode of audion VT5.Two
The P pole of pole pipe D7 is connected with the colelctor electrode of audion VT5, its N pole then with the negative pole phase of amplifier P
Connect.Resistance R11 is serially connected between positive pole and the outfan of amplifier P.
Meanwhile, the base stage of described audion VT5 is connected with the emitter stage of audion VT4.Described electric capacity
The negative pole of C7 is connected with the outfan of amplifier P.The outfan of described amplifier P is as this voltage ratio relatively
The outfan of circuit is also connected with the GND pin of control chip U3.
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；
Meanwhile, the upper voltage limit of input voltage with setting can be compared by the present invention accurately, thus greatly
Improve the judgement precision of the present invention, make the present invention not have the existing picture of erroneous judgement, can be effectively to LED
Carry out overvoltage protection.
As it has been described above, just can well realize the present invention.
Claims (6)
1. a LED mains supply over-voltage based on voltage comparator circuit protects system, it is characterised in that main
Will be by transformator T, control chip U3, three-terminal voltage-stabilizing chip U2, the switch being connected with control chip U3
Circuit, is serially connected in the resistance R4 between CONT pin and the on-off circuit of control chip U3, with transformator
The current rectifying and wave filtering circuit that T-phase connects, the triggering circuit being connected with current rectifying and wave filtering circuit, P pole and triggering circuit
Be connected, diode D4 that N pole is then connected with the TRIG pin of control chip U3, positive pole and three poles
The colelctor electrode of pipe VT3 is connected, negative pole THRE pin with control chip U3 after resistance R3 is connected
Electric capacity C4, and be serially connected in the voltage comparator circuit composition triggered between circuit and control chip U3；Institute
State the IN pin of three-terminal voltage-stabilizing chip U2 with trigger circuit be connected, its OUT pin the most respectively with control core
The RE pin of sheet U3 is connected with VCC pin, its GND pin ground connection.
A kind of LED mains supply over-voltage based on voltage comparator circuit the most according to claim 1 is protected
System, it is characterised in that described voltage comparator circuit by audion VT4, audion VT5, amplifier P,
Negative pole is connected with the base stage of audion VT4, positive pole as the electric capacity C6 of the input of this voltage comparator circuit,
N pole is connected with the positive pole of amplifier P, P pole base stage with audion VT4 after resistance R7 is connected
Diode D6, the resistance R8 being serially connected between the P pole of diode D6 and the colelctor electrode of audion VT4,
Positive pole is connected with the emitter stage of audion VT4, the electric capacity C7 of minus earth, is serially connected in audion VT5
Emitter stage and the negative pole of electric capacity C7 between resistance R9, be serially connected in negative pole and the electric capacity C7 of amplifier P
Negative pole between resistance R10, positive pole is connected with the N pole of diode D6, negative pole and audion VT5
Electric capacity C8, the P pole that is connected of colelctor electrode be connected with the colelctor electrode of audion VT5, N pole then with amplification
The diode D7 that the negative pole of device P is connected, and it is serially connected in the electricity between positive pole and the outfan of amplifier P
Resistance R11 composition；The base stage of described audion VT5 is connected with the emitter stage of audion VT4；Described electric capacity
The negative pole of C7 is connected with the outfan of amplifier P；The outfan of described amplifier P is as this voltage ratio relatively
The outfan of circuit is also connected with the GND pin of control chip U3；The input of described voltage comparator circuit
End is then connected with triggering circuit.
A kind of LED mains supply over-voltage based on voltage comparator circuit the most according to claim 2 is protected
System, it is characterised in that described current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1；Institute
The negative pole of the cathode output end and electric capacity C1 of stating diode rectifier U1 is connected, its cathode output end then with
The positive pole of electric capacity C1 is connected；The input of described diode rectifier U1 is then electric with the secondary of transformator T
The Same Name of Ends of sense coil is connected with non-same polarity, its cathode output end also with the former limit inductor wire of transformator T
The non-same polarity of circle 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 based on voltage comparator circuit the most according to claim 3 is protected
System, it is characterised in that described triggering circuit by audion VT1, audion VT2, audion VT3,
The diode that N pole is connected with the negative pole of electric capacity C1, P pole then emitter stage with audion VT1 is connected
D1, positive pole is connected with the emitter stage of audion VT1, negative pole then base stage with audion VT3 is connected
Electric capacity C2, the resistance R1 being serially connected between the emitter stage of audion VT2 and the base stage of audion VT3, just
The electric capacity C3 that pole is connected with the emitter stage of audion VT3, negative pole is then connected with the N pole of diode D1,
P pole is connected with the colelctor electrode of audion VT2, N pole then colelctor electrode with audion VT3 is connected two
Pole pipe D3, N pole is connected with the positive pole of electric capacity C1, P pole then colelctor electrode with audion VT2 is connected
Diode D2, and the resistance R2 being serially connected between the N pole of diode D2 and the N pole of diode D3
Composition；The IN pin of described three-terminal voltage-stabilizing chip U2 is then connected with the N pole of diode D2；Described three
The base stage of pole pipe VT1 is connected with the positive pole of electric capacity C1, its colelctor electrode then with the base stage phase of audion VT2
Connect；The GND pin of described control chip U3 is connected with the N pole of diode D1；Described diode
The N pole of D1 is connected with the input of voltage comparator circuit；The colelctor electrode of described audion VT3 is also distinguished
It is connected with the N pole of diode D4 and the positive pole of electric capacity C4.
A kind of LED mains supply over-voltage based on voltage comparator circuit the most according to claim 4 is protected
System, it is characterised in that described on-off circuit, by bidirectional thyristor D5, is serially connected in bidirectional thyristor D5's
Control the resistance R5 between pole and the OUT pin of control chip U3, the of positive pole and bidirectional thyristor D5
The electric capacity C5 of ground connection while two anodes are connected, negative pole is then connected with the GND pin of control chip U3,
And one end is connected with the first anode of bidirectional thyristor D5, the other end then with the former limit inductance of transformator T
The resistance R6 composition that the Same Name of Ends of coil is connected；The negative pole of described electric capacity C5 after resistance R4 with control
The CONT pin of chip U3 is connected.
A kind of LED mains supply over-voltage based on voltage comparator circuit the most according to claim 5 is protected
System, it is characterised in that described control chip U3 is the integrated chip of NE555, three-terminal voltage-stabilizing chip U2 is
7815 integrated chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610417216.7A CN105977902A (en) | 2016-06-14 | 2016-06-14 | Voltage comparison circuit based mains supply overvoltage protection system for LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610417216.7A CN105977902A (en) | 2016-06-14 | 2016-06-14 | Voltage comparison circuit based mains supply overvoltage protection system for LED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105977902A true CN105977902A (en) | 2016-09-28 |
Family
ID=57010531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610417216.7A Pending CN105977902A (en) | 2016-06-14 | 2016-06-14 | Voltage comparison circuit based mains supply overvoltage protection system for LED |
Country Status (1)
| Country | Link |
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| CN (1) | CN105977902A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018145381A1 (en) * | 2017-02-13 | 2018-08-16 | 中领世能 (天津) 科技有限公司 | Circuit protection device and power supply system |
-
2016
- 2016-06-14 CN CN201610417216.7A patent/CN105977902A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018145381A1 (en) * | 2017-02-13 | 2018-08-16 | 中领世能 (天津) 科技有限公司 | Circuit protection device and power supply system |
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Application publication date: 20160928 |