CN108322963A - A kind of short-circuit detection protection circuit - Google Patents
A kind of short-circuit detection protection circuit Download PDFInfo
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- CN108322963A CN108322963A CN201810231977.2A CN201810231977A CN108322963A CN 108322963 A CN108322963 A CN 108322963A CN 201810231977 A CN201810231977 A CN 201810231977A CN 108322963 A CN108322963 A CN 108322963A
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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
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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
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- 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
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Abstract
The invention discloses a kind of short-circuit detection protection circuit, including LED drive circuit, the LED drive circuit is electrically connected with LED, and the LED drive circuit includes the first metal-oxide-semiconductor；Circuit is protected, the protection circuit and the LED are in parallel or series；The both ends of short-circuit detecting circuit, the short-circuit detecting circuit are electrically connected with the protection circuit and first metal-oxide-semiconductor respectively；Wherein, when the short-circuit detecting circuit detects that first metal-oxide-semiconductor breaks down; the short-circuit detecting circuit sends out fault-signal to the protection circuit; to drive the protection circuit to execute protection act to the LED; effectively avoid LED persistent fevers; and then avoid the carbonizations of the PCB around LED, surrounding plastic structural member hot melt, insulation damage layer etc., reduce electric shock risk.
Description
Technical field
The present invention relates to display technology field more particularly to a kind of short-circuit detection protection circuits.
Background technology
Some conventional fluorescent lamp ＆ lantern illuminating products for connecing Inductive ballast are gradually substituted by LED product in the market.Compatible electricity
Feel the LED product of ballast, driving circuit can be buck circuits, as shown in Figure 1, as the power MOS pipe Q1 of buck circuits
DS puncture shorts when, input alternating current by Inductive ballast 1, fuse FUSE, rectifier bridge DB1, LED, inductance L1, short circuit after
Metal-oxide-semiconductor Q1 forming circuit.At this point, LED current increased dramatically.Due to the current limliting of Inductive ballast, increased LED current is insufficient
So that fuse FUSE open circuits still can exceed the maximum current that LED can be born.In this case, LED persistent fevers, meeting
Cause the PCB around LED to be carbonized, even surrounding plastic structural member heat, serious to destroy insulating layer, there are the wind of electric shock
Danger.
Invention content
The embodiment of the present invention provides a kind of short-circuit detection protection circuit, for solving metal-oxide-semiconductor in existing LED drive circuit
It breaks down the problem of leading to LED persistent fevers.
The embodiment of the present invention uses following technical proposals：
In a first aspect, the present invention provides a kind of short-circuit detection protection circuits, including：
LED drive circuit, the LED drive circuit are electrically connected with LED, and the LED drive circuit includes the first metal-oxide-semiconductor；
Circuit is protected, the protection circuit and the LED are in parallel or series；
Short-circuit detecting circuit, the both ends of the short-circuit detecting circuit respectively with the protection circuit and first metal-oxide-semiconductor
Electrical connection；
Wherein, when the short-circuit detecting circuit detects that first metal-oxide-semiconductor breaks down, the short-circuit detecting circuit
Fault-signal is sent out to the protection circuit, to drive the protection circuit to execute protection act to the LED.
Further, the short-circuit detecting circuit includes：First resistor, second resistance, 3rd resistor, the first capacitance,
Two capacitances, the first diode, the second diode and the first voltage-stabiliser tube, wherein
The one end of the both ends of the first resistor respectively with the drain electrode of first metal-oxide-semiconductor and first capacitance is electrically connected
It connects, the cathode of the other end of first capacitance respectively with the anode of first diode and second diode is electrically connected
Connect, the cathode of first diode respectively with one end of second capacitance, the cathode of first voltage-stabiliser tube, described second
One end of resistance is electrically connected, and the other end of the second resistance is electric with one end of the 3rd resistor and the protection circuit respectively
Connection, the other end of the 3rd resistor, first voltage-stabiliser tube positive, described second capacitance the other end and described second
The anode electrical connection of diode.
Further, the short-circuit detecting circuit includes：First diode, first resistor, second resistance, the first capacitance and
First voltage-stabiliser tube, wherein
The one end of the anode of first diode respectively with the drain electrode of first metal-oxide-semiconductor and the first resistor is electrically connected
Connect, the other end of the first resistor respectively with one end of first capacitance, the cathode of first voltage-stabiliser tube, described second
One end of resistance and protection circuit electrical connection, the other end of the second resistance, the anode of first voltage-stabiliser tube and institute
State the other end electrical connection of the first capacitance.
Further, the protection circuit includes the second metal-oxide-semiconductor；Wherein,
The drain electrode of second metal-oxide-semiconductor is electrically connected with the cathode of the LED；
Positive, described the of the source electrode of second metal-oxide-semiconductor and the other end of the 3rd resistor, first voltage-stabiliser tube
The anode electrical connection of the other end of two capacitances and second diode；
The one end of the grid of second metal-oxide-semiconductor respectively with the other end of the second resistance and the 3rd resistor is electrically connected
It connects.
Further, the protection circuit includes：4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, third electricity
Appearance, the second voltage-stabiliser tube, the first thyristor and the second metal-oxide-semiconductor, wherein
Second metal-oxide-semiconductor drain electrode respectively with one end of the 4th resistance, the cathode of second voltage-stabiliser tube and institute
One end electrical connection of the 6th resistance is stated, the other end of the 4th resistance is electrically connected with the anode of the LED, second voltage stabilizing
The anode of pipe is electric with the control pole of one end of the 7th resistance, one end of the third capacitance and first thyristor respectively
Connection, the anode of first thyristor are electrically connected with one end of the 5th resistance, the other end of the 5th resistance and institute
State the anode electrical connection of LED；
The source electrode of second metal-oxide-semiconductor, the cathode of first thyristor, the other end of the 7th resistance, described
The other end of three capacitances, the other end of the 6th resistance, the other end of the 3rd resistor, first voltage-stabiliser tube are just
The anode electrical connection of pole, the other end of second capacitance and second diode；
The one end of the grid of second metal-oxide-semiconductor respectively with the other end of the second resistance and the 3rd resistor is electrically connected
It connects.
Further, the protection circuit includes the second metal-oxide-semiconductor；Wherein,
The drain electrode of second metal-oxide-semiconductor is electrically connected with the cathode of the LED；
The source electrode of second metal-oxide-semiconductor is electrically connected with the short-circuit detecting circuit；
The grid of second metal-oxide-semiconductor is electrically connected with the short-circuit detecting circuit.
Further, the grid of second metal-oxide-semiconductor respectively with the other end of the first resistor, first capacitance
One end of one end, the cathode of first voltage-stabiliser tube and the second resistance is electrically connected；
The source electrode of second metal-oxide-semiconductor respectively with the other end of the second resistance, first voltage-stabiliser tube anode and
The other end of first capacitance is electrically connected.
Further, the protection circuit includes：4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, third electricity
Appearance, the second voltage-stabiliser tube, the first thyristor and the second metal-oxide-semiconductor, wherein
Second metal-oxide-semiconductor drain electrode respectively with one end of the 4th resistance, the cathode of second voltage-stabiliser tube and institute
One end electrical connection of the 6th resistance is stated, the other end of the 4th resistance is electrically connected with the anode of the LED, second voltage stabilizing
The anode of pipe is electric with the control pole of one end of the 7th resistance, one end of the third capacitance and first thyristor respectively
Connection, the anode of first thyristor are electrically connected with one end of the 5th resistance, the other end of the 5th resistance and institute
State the anode electrical connection of LED；
The source electrode of second metal-oxide-semiconductor, the cathode of first thyristor, the other end of the 7th resistance, described
The other end of three capacitances, the 6th resistance the other end be electrically connected with the short-circuit detecting circuit；
The grid of second metal-oxide-semiconductor is electrically connected with the short-circuit detecting circuit.
Further, the grid of second metal-oxide-semiconductor respectively with the other end of the first resistor, first capacitance
One end of one end, the cathode of first voltage-stabiliser tube and the second resistance is electrically connected；
The source electrode of second metal-oxide-semiconductor respectively with the other end of the second resistance, first voltage-stabiliser tube anode and
The other end of first capacitance is electrically connected.
Further, the LED drive circuit is BUCK circuits.
Further, the BUCK circuits include：Fuse, rectifier bridge, the first polar capacitor, the second polar capacitor,
One diode, first resistor, second resistance and the first inductance, wherein
One end of the fuse is electrically connected with Inductive ballast, and the of the other end of the fuse and the rectifier bridge
One end is electrically connected, and the second end of the rectifier bridge is negative with positive, described first diode of first polar capacitor respectively
Pole, second polar capacitor positive, the described first resistor one end and the LED anodes electrical connection, the rectifier bridge
Third end is electrically connected with zero curve, the 4th end of the rectifier bridge respectively with the cathode of first polar capacitor and second electricity
One end electrical connection is hindered, the other end of the second resistance is electrically connected with the source electrode of first metal-oxide-semiconductor, first metal-oxide-semiconductor
Drain electrode is electrically connected with one end of first inductance, and the other end of first inductance is negative with second polar capacitor respectively
The other end electrical connection of pole, the first resistor, the grid of first metal-oxide-semiconductor access drive signal.
Above-mentioned at least one technical solution used in the embodiment of the present invention can reach following advantageous effect：
Short-circuit detection protection circuit provided in an embodiment of the present invention comprising LED drive circuit, protection circuit and short circuit inspection
Slowdown monitoring circuit, the LED drive circuit are electrically connected with LED, which includes the first metal-oxide-semiconductor, and the protection circuit and LED are simultaneously
The both ends of connection or series connection, the short-circuit detecting circuit are electrically connected with protection circuit and the first metal-oxide-semiconductor respectively.Wherein, work as short-circuit detecting
When circuit detects that the first metal-oxide-semiconductor breaks down, short-circuit detecting circuit sends out fault-signal to protection circuit, with driving protection electricity
Road executes protection act to LED, effectively avoids LED persistent fevers, and then avoids the carbonizations of the PCB around LED, surrounding plastic knot
Component hot melt, insulation damage layer etc., reduce electric shock risk.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and constitutes the part of the present invention, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of LED drive circuit in the prior art；
Fig. 2 is a kind of one of structural schematic diagram of short-circuit detection protection circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of second structural representation of short-circuit detection protection circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of third structural representation of short-circuit detection protection circuit provided in an embodiment of the present invention；
Fig. 5 is the four of a kind of structural schematic diagram of short-circuit detection protection circuit provided in an embodiment of the present invention；
Fig. 6 is the five of a kind of structural schematic diagram of short-circuit detection protection circuit provided in an embodiment of the present invention；
Fig. 7 is the six of a kind of structural schematic diagram of short-circuit detection protection circuit provided in an embodiment of the present invention.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Short-circuit detection protection circuit provided in an embodiment of the present invention includes：LED drive circuit 10, protection circuit 20 and short circuit
Detection circuit 30.Wherein, circuit structure in the prior art may be used in LED drive circuit 10, the LED drive circuit and LED
Electrical connection, the LED drive circuit include the first metal-oxide-semiconductor.
When it is implemented, the LED drive circuit 10 can be BUCK circuits, which may include：Fuse F1,
Rectifier bridge DB1, the first polar capacitor EC1, the second polar capacitor EC2, the first diode D01, first resistor R01, second resistance
R02 and the first inductance L1.
Wherein, one end of fuse F1 is electrically connected with Inductive ballast, and the of the other end of fuse F1 and rectifier bridge DB1
One end is electrically connected, the second end of rectifier bridge DB1 respectively with the anode of the first polar capacitor EC1, the first diode D01 cathode,
The anode of second polar capacitor EC2, one end of first resistor R01 and the electrical connection of LED anodes, the third end and zero of rectifier bridge DB1
Line is electrically connected, and the 4th end of rectifier bridge DB1 is electrically connected with the cathode of the first polar capacitor EC1 and the one end second resistance R02 respectively,
The other end of second resistance R02 is electrically connected with the source electrode of the first metal-oxide-semiconductor, one end of the drain electrode and the first inductance L1 of the first metal-oxide-semiconductor
Electrical connection, the other end of the other end of the first inductance L1 respectively with the cathode of the second polar capacitor EC2, first resistor R01 are electrically connected
It connecing, the grid of the first metal-oxide-semiconductor connects constant current drive integrated circult IC, for accessing drive signal for the grid of the first metal-oxide-semiconductor, when
So, constant current drive integrated circult is not limited to for what the grid of the first metal-oxide-semiconductor provided drive signal in embodiments of the present invention
IC。
The operation principle of the BUCK circuits is：When the drive signal that the grid of the first metal-oxide-semiconductor Q1 accesses is high level signal
When, the drain electrode of the first metal-oxide-semiconductor Q1 and source conduction, the first inductance L1 are magnetized, and the electric current for flowing through the first inductance L1 is linearly increasing,
Simultaneously to the second polar capacitor EC2 chargings, to provide energy to load LED；When the driving that the grid of the first metal-oxide-semiconductor Q1 accesses
When signal is low level signal, the first metal-oxide-semiconductor Q1 cut-off, the first inductance L1 is discharged by the first diode of afterflow D01, flows through the
The electric current of one inductance L1 is linearly reduced, to provide what energy discharged and reduced by the second polar capacitor EC2 to load LED
First inductance L1 electric currents maintain.Wherein, second resistance R02 is current sampling resistor, and rectifier bridge DB1 is used for rectification, the first polarity
Capacitance EC1 is for filtering.
Certainly, the realization structure of LED drive circuit can also use other structures, the embodiment of the present invention not to limit specifically
It is fixed.It is set according to actual demand when specific implementation.
The circuit connection structure of short-circuit detection protection circuit provided in an embodiment of the present invention is as described below：
First, as shown in Fig. 2, protection circuit 20 is in parallel with LED.The both ends of short-circuit detecting circuit 30 respectively with protection circuit
20 and the first metal-oxide-semiconductor Q1 electrical connection.Wherein, when short-circuit detecting circuit 30 detects that the first metal-oxide-semiconductor Q1 breaks down, short circuit inspection
Slowdown monitoring circuit 30 sends out fault-signal to protection circuit 20, and protection act is executed to LED with Drive Protecting Circuit 20.
Second, as shown in figure 3, protection circuit 20 is connected with LED.The both ends of short-circuit detecting circuit 30 respectively with protection circuit
20 and the first metal-oxide-semiconductor Q1 electrical connection.Wherein, when short-circuit detecting circuit 30 detects that the first metal-oxide-semiconductor Q1 breaks down, short circuit inspection
Slowdown monitoring circuit 30 sends out fault-signal to protection circuit 20, and protection act is executed to LED with Drive Protecting Circuit 20.
Short-circuit detection protection circuit provided in an embodiment of the present invention comprising LED drive circuit, protection circuit and short circuit inspection
Slowdown monitoring circuit, the LED drive circuit are electrically connected with LED, which includes the first metal-oxide-semiconductor, and the protection circuit and LED are simultaneously
The both ends of connection or series connection, the short-circuit detecting circuit are electrically connected with protection circuit and the first metal-oxide-semiconductor respectively.Wherein, work as short-circuit detecting
When circuit detects that the first metal-oxide-semiconductor breaks down, short-circuit detecting circuit sends out fault-signal to protection circuit, with driving protection electricity
Road executes protection act to LED, effectively avoids LED persistent fevers, and then avoids the carbonizations of the PCB around LED, surrounding plastic knot
Component hot melt, insulation damage layer etc., reduce electric shock risk.
It can be a variety of that short-circuit detecting circuit 30 in above-described embodiment, which implements structure, and the embodiment of the present invention, which is not done, to be had
Body limits.When it is implemented, the short-circuit detecting circuit 30 can be respectively adopted such as lower structure, such as：
The short-circuit detecting circuit 30 of the first structure, the short-circuit detecting circuit 30 may include：First resistor, the second electricity
Resistance, 3rd resistor, the first capacitance, the second capacitance, the first diode, the second diode and the first voltage-stabiliser tube, wherein
The both ends of first resistor are electrically connected with one end of the drain electrode of the first metal-oxide-semiconductor and the first capacitance respectively, the first capacitance
The other end is electrically connected with the anode and the cathode of the second diode of the first diode respectively, and the cathode of the first diode is respectively with the
One end electrical connection of one end of two capacitances, the cathode of the first voltage-stabiliser tube, second resistance, the other end of second resistance respectively with third
One end of resistance and protection circuit 20 are electrically connected, the other end of 3rd resistor, the anode of the first voltage-stabiliser tube, the second capacitance it is another
The anode electrical connection at end and the second diode.
Wherein, the frequency when normal work of the first metal-oxide-semiconductor can be 30K-100KHZ, certain first metal-oxide-semiconductor it is normal
Frequency when work can also be other power, and when specific implementation does not limit.First resistor and the first capacitance take for high frequency
Electricity, the first diode and the second diode play rectified action, and the second capacitance is filter capacitor, and the first voltage-stabiliser tube is used for voltage stabilizing extremely
DC voltage.
The short-circuit detecting circuit 30 of second of structure, the short-circuit detecting circuit 30 may include：First diode, the first electricity
Resistance, second resistance, the first capacitance and the first voltage-stabiliser tube, wherein
The anode of first diode is electrically connected with one end of the drain electrode of the first metal-oxide-semiconductor and first resistor respectively, first resistor
The other end respectively with one end of the first capacitance, the cathode of the first voltage-stabiliser tube, second resistance one end and protection circuit 20 be electrically connected
It connects, the other end electrical connection of the other end of second resistance, the anode of the first voltage-stabiliser tube and the first capacitance.
Wherein, the frequency when normal work of the first metal-oxide-semiconductor can be 30K-100KHZ, certain first metal-oxide-semiconductor it is normal
Frequency when work can also be other power, and when specific implementation does not limit.First diode be used for rectification, first resistor with
For first capacitance for filtering, the first voltage-stabiliser tube is used for pressure limiting, and second resistance is used for current limliting.
The specific implementation structure of protection circuit 20 in above-described embodiment can be a variety of, and the embodiment of the present invention is not done specifically
It limits.When it is implemented, the protection circuit 20 can be respectively adopted such as lower structure, such as：
The protection circuit 20 of the first structure, the protection circuit 20 may include the second metal-oxide-semiconductor；Wherein,
The drain electrode of second metal-oxide-semiconductor is electrically connected with the cathode of LED；
The source electrode of second metal-oxide-semiconductor is electrically connected with short-circuit detecting circuit 30；
The grid of second metal-oxide-semiconductor is electrically connected with short-circuit detecting circuit 30.
The protection circuit 20 of second of structure, the protection circuit 20 may include：4th resistance, the 5th resistance, the 6th electricity
Resistance, the 7th resistance, third capacitance, the second voltage-stabiliser tube, the first thyristor and the second metal-oxide-semiconductor, wherein
Second metal-oxide-semiconductor drain electrode respectively with one end of the 4th resistance, one end of the cathode and the 6th resistance of the second voltage-stabiliser tube
Electrical connection, the other end of the 4th resistance be electrically connecteds with the anode of LED, the second voltage-stabiliser tube it is positive respectively with the 7th resistance one
The control pole electrical connection at end, one end of third capacitance and the first thyristor, one end of the anode of the first thyristor and the 5th resistance
Electrical connection, the other end of the 5th resistance are electrically connected with the anode of LED；
The source electrode of second metal-oxide-semiconductor, the cathode of the first thyristor, the other end of the 7th resistance, the other end of third capacitance,
The other end of six resistance is electrically connected with the short-circuit detecting circuit 30；
The grid of second metal-oxide-semiconductor is electrically connected with short-circuit detecting circuit 30.
Wherein, the 4th resistance and the 6th resistance codetermine the overvoltage protection on output open circuit, and the 5th resistance is limited galvanic electricity
Resistance, the 7th resistance provides electric discharge approach when the second voltage-stabiliser tube ends for third capacitance, while the 7th resistance can prevent second
The control pole of the first thyristor is by false triggering when voltage-stabiliser tube ends, and third capacitance is for filtering.
When it is implemented, the short-circuit detecting of the short-circuit detecting circuit 30 of the first structure described above, second structure
The protection circuit 20 of circuit 30, the protection circuit 20 of the first structure and second of structure can form four kinds of knots with combination of two
The short-circuit detection protection circuit of structure, as described below：
The first, as shown in figure 4, the short-circuit detection protection circuit includes LED drive circuit 10,30 and of short-circuit detecting circuit
Protect circuit 20.
The short-circuit detecting circuit 30 may include：First resistor R1, second resistance R2,3rd resistor R3, the first capacitance C1,
Second capacitance C2, the first diode D1, the second diode D2 and the first voltage-stabiliser tube ZD1, wherein
The both ends of first resistor R1 are electrically connected with one end of the drain electrode of the first metal-oxide-semiconductor and the first capacitance C1 respectively, the first electricity
The other end for holding C1 is electrically connected with the cathode of the anode of the first diode D1 and the second diode D2 respectively, the first diode D1's
Cathode is electrically connected with one end of one end of the second capacitance C2, the cathode of the first voltage-stabiliser tube ZD1, second resistance R2 respectively, the second electricity
The other end for hindering R2 is electrically connected with one end of 3rd resistor R3 and protection circuit 20 respectively, the other end of 3rd resistor R3, first
The anode electrical connection of the anode of voltage-stabiliser tube ZD1, the other end of the second capacitance C2 and the second diode D2.
The protection circuit 20 is in parallel with LED, specifically can be achieved be：The protection circuit 20 may include：4th resistance R4,
Five resistance R5, the 6th resistance R6, the 7th resistance R7, third capacitance C3, the second voltage-stabiliser tube ZD2, the first thyristor SCR1 and second
Metal-oxide-semiconductor Q2, wherein
Second metal-oxide-semiconductor Q2 drain electrode respectively with one end of the 4th resistance R4, the cathode and the 6th resistance of the second voltage-stabiliser tube ZD2
One end of R6 is electrically connected, and the other end of the 4th resistance R4 be electrically connected with the anode of LED, the second voltage-stabiliser tube ZD2 it is positive respectively with
The control pole of one end of the 7th resistance R7, one end of third capacitance C3 and the first thyristor SCR1 is electrically connected, the first thyristor
The anode of SCR1 is electrically connected with one end of the 5th resistance R5, and the other end of the 5th resistance R5 is electrically connected with the anode of LED；
The source electrode of second metal-oxide-semiconductor Q2, the cathode of the first thyristor SCR1, the other end of the 7th resistance R7, third capacitance C3
The other end, the other end of the 6th resistance R6, the other end of 3rd resistor R3, the first voltage-stabiliser tube ZD1 anode, the second capacitance C2
The other end and the second diode D2 anode electrical connection；
The grid of second metal-oxide-semiconductor Q2 is electrically connected with one end of the other end of second resistance R2 and 3rd resistor R3 respectively.
The operation principle of the short-circuit detection protection circuit of the first structure provided in an embodiment of the present invention is：As the first MOS
When pipe Q1 normal works, the first metal-oxide-semiconductor Q1 drains are high-frequency switching signal, and high-frequency current flows through first resistor R1, the first capacitance
The gate-source voltage of the grid of C1, the first diode D1, second resistance R2 to the second metal-oxide-semiconductor Q2, the second metal-oxide-semiconductor Q2 is high electricity
It is flat.At this point, the second metal-oxide-semiconductor Q2 is connected, the portion of electrical current at LED anodes flows through the drain-source of the 4th resistance R4 and the second metal-oxide-semiconductor Q2
Pole, the second voltage-stabiliser tube ZD2 and the first thyristor SCR1 cut-offs；When hourglass source electrode short trouble occurs for the first metal-oxide-semiconductor Q1, the is flowed through
One metal-oxide-semiconductor Q1 hourglass source electrodes are DC signal, and no current flows into the grid of the second metal-oxide-semiconductor Q2 by the first capacitance C1, second
The gate-source voltage of metal-oxide-semiconductor Q2 is low level.At this point, the second metal-oxide-semiconductor Q2 ends, the electric current at LED anodes flows through the 4th resistance
The control pole of R4 and the second voltage-stabiliser tube ZD2 to the first thyristor SCR1, the first thyristor SCR1 triggering and conductings, and due to the 5th electricity
The conducting resistance very little of R5 and the first thyristor SCR1 are hindered, the 5th resistance R5 and the first thyristor SCR1 be equivalent to conducting wire, when the
After one thyristor SCR1 triggering and conductings, the electric current at LED anodes flows through the 5th resistance R5 and the first thyristor SCR1, short-circuit LED,
To realize the purpose of protection LED.
Second, as shown in figure 5, the short-circuit detection protection circuit includes LED drive circuit 10,30 and of short-circuit detecting circuit
Protect circuit 20.
The short-circuit detecting circuit 30 may include：First resistor R1, second resistance R2,3rd resistor R3, the first capacitance C1,
Second capacitance C2, the first diode D1, the second diode D2 and the first voltage-stabiliser tube ZD1, wherein
The both ends of first resistor R1 are electrically connected with one end of the drain electrode of the first metal-oxide-semiconductor and the first capacitance C1 respectively, the first electricity
The other end for holding C1 is electrically connected with the cathode of the anode of the first diode D1 and the second diode D2 respectively, the first diode D1's
Cathode is electrically connected with one end of one end of the second capacitance C2, the cathode of the first voltage-stabiliser tube ZD1, second resistance R2 respectively, the second electricity
The other end for hindering R2 is electrically connected with one end of 3rd resistor R3 and protection circuit 20 respectively, the other end of 3rd resistor R3, first
The anode electrical connection of the anode of voltage-stabiliser tube ZD1, the other end of the second capacitance C2 and the second diode D2.
The protection circuit 20 is connected with LED, specifically can be achieved be：The protection circuit 20 may include the second metal-oxide-semiconductor Q2；Its
In,
The drain electrode of second metal-oxide-semiconductor Q2 is electrically connected with the cathode of LED；
The source electrode of second metal-oxide-semiconductor Q2 and the other end of 3rd resistor R3, the anode of the first voltage-stabiliser tube ZD1, the second capacitance C2
The other end and the second diode D2 anode electrical connection；
The grid of second metal-oxide-semiconductor Q2 is electrically connected with one end of the other end of second resistance R2 and 3rd resistor R3 respectively.
The operation principle of the short-circuit detection protection circuit of second of structure provided in an embodiment of the present invention is：As the first MOS
When pipe Q1 normal works, the first metal-oxide-semiconductor Q1 drains are high-frequency switching signal, and high-frequency current flows through first resistor R1, the first capacitance
The gate-source voltage of the grid of C1, the first diode D1, second resistance R2 to the second metal-oxide-semiconductor Q2, the second metal-oxide-semiconductor Q2 is high electricity
It is flat.At this point, the second metal-oxide-semiconductor Q2 is connected, the electric current at LED anodes flows through the hourglass source electrode of LED and the second metal-oxide-semiconductor Q2；As the first MOS
When hourglass source electrode short trouble occurs for pipe Q1, it is DC signal to flow through the first metal-oxide-semiconductor Q1 hourglass source electrodes, and no current passes through the first electricity
Hold the grid that C1 flows into the second metal-oxide-semiconductor Q2, the gate-source voltage of the second metal-oxide-semiconductor Q2 is low level.At this point, the second metal-oxide-semiconductor Q2 is cut
Only, no current flows through LED, then to realize the purpose of protection LED.
The third, as shown in fig. 6, the short-circuit detection protection circuit includes LED drive circuit 10,30 and of short-circuit detecting circuit
Protect circuit 20.
The short-circuit detecting circuit 30 may include：First diode D1, first resistor R1, second resistance R2, the first capacitance
C1 and the first voltage-stabiliser tube ZD1, wherein
The anode of first diode D1 is electrically connected with one end of the drain electrode of the first metal-oxide-semiconductor and first resistor R1 respectively, and first
The other end of resistance R1 respectively with one end of the first capacitance C1, the cathode of the first voltage-stabiliser tube ZD1, one end of second resistance R2 and guarantor
Protection circuit 20 is electrically connected, and the other end of the other end of second resistance R2, the anode of the first voltage-stabiliser tube ZD1 and the first capacitance C1 is electrically connected
It connects.
The protection circuit 20 is in parallel with LED, specifically can be achieved be：The protection circuit 20 may include：4th resistance R4,
Five resistance R5, the 6th resistance R6, the 7th resistance R7, third capacitance C3, the second voltage-stabiliser tube ZD2, the first thyristor SCR1 and second
Metal-oxide-semiconductor Q2, wherein
Second metal-oxide-semiconductor Q2 drain electrode respectively with one end of the 4th resistance R4, the cathode and the 6th resistance of the second voltage-stabiliser tube ZD2
One end of R6 is electrically connected, and the other end of the 4th resistance R4 be electrically connected with the anode of LED, the second voltage-stabiliser tube ZD2 it is positive respectively with
The control pole of one end of the 7th resistance R7, one end of third capacitance C3 and the first thyristor SCR1 is electrically connected, the first thyristor
The anode of SCR1 is electrically connected with one end of the 5th resistance R5, and the other end of the 5th resistance R5 is electrically connected with the anode of LED；
The source electrode of second metal-oxide-semiconductor Q2, the cathode of the first thyristor SCR1, the other end of the 7th resistance R7, third capacitance C3
The other end, the other end of the 6th resistance R6, the other end of second resistance R2, the first voltage-stabiliser tube ZD1 anode and the first capacitance
The other end of C1 is electrically connected；
The grid of second metal-oxide-semiconductor Q2 respectively with the other end of first resistor R1, one end of the first capacitance C1, the first voltage-stabiliser tube
One end electrical connection of the cathode and second resistance R2 of ZD1.
The operation principle of the short-circuit detection protection circuit of the third structure provided in an embodiment of the present invention is：As the first MOS
When pipe Q1 normal works, the first metal-oxide-semiconductor Q1 drains are high-frequency switching signal, and high-frequency current flows through the first diode D1, the first electricity
The grid of R1 to the second metal-oxide-semiconductor Q2 is hindered, the gate-source voltage of the second metal-oxide-semiconductor Q2 is high level.At this point, the second metal-oxide-semiconductor Q2 conductings,
Portion of electrical current at LED anodes flows through the hourglass source electrode of the 4th resistance R4 and the second metal-oxide-semiconductor Q2, and the second voltage-stabiliser tube ZD2 and first is brilliant
Brake tube SCR1 cut-offs；When hourglass source electrode short trouble occurs for the first metal-oxide-semiconductor Q1, the first metal-oxide-semiconductor Q1 drain-source electrode potentials are identical, are
Low potential, the first diode D1 cut-offs, no current flow into the grid of the second metal-oxide-semiconductor Q2, and the gate-source voltage of the second metal-oxide-semiconductor Q2 is
Low level.At this point, the second metal-oxide-semiconductor Q2 cut-off, the electric current at LED anodes flows through the 4th resistance R4 and the second voltage-stabiliser tube ZD2 to the
The control pole of one thyristor SCR1, the first thyristor SCR1 triggering and conductings, and due to the 5th resistance R5 and the first thyristor SCR1
Conducting resistance very little, the 5th resistance R5 and the first thyristor SCR1 are equivalent to conducting wire, when the first thyristor SCR1 triggering and conductings
Afterwards, the electric current at LED anodes flows through the 6th resistance R6 and the first thyristor SCR1, short-circuit LED, then to realize protection LED's
Purpose.
4th kind, as shown in fig. 7, the short-circuit detection protection circuit includes LED drive circuit 10,30 and of short-circuit detecting circuit
Protect circuit 20.
The short-circuit detecting circuit 30 may include：First diode D1, first resistor R1, second resistance R2, the first capacitance
C1 and the first voltage-stabiliser tube ZD1, wherein
The anode of first diode D1 is electrically connected with one end of the drain electrode of the first metal-oxide-semiconductor and first resistor R1 respectively, and first
The other end of resistance R1 respectively with one end of the first capacitance C1, the cathode of the first voltage-stabiliser tube ZD1, one end of second resistance R2 and guarantor
Protection circuit 20 is electrically connected, and the other end of the other end of second resistance R2, the anode of the first voltage-stabiliser tube ZD1 and the first capacitance C1 is electrically connected
It connects.
The protection circuit 20 is connected with LED, specifically can be achieved be：The protection circuit 20 may include the second metal-oxide-semiconductor Q2；Its
In,
The drain electrode of second metal-oxide-semiconductor Q2 is electrically connected with the cathode of LED；
The source electrode of second metal-oxide-semiconductor Q2 is electric with the other end of second resistance R2, the anode of the first voltage-stabiliser tube ZD1 and first respectively
Hold the other end electrical connection of C1；
The grid of second metal-oxide-semiconductor Q2 respectively with the other end of first resistor R1, one end of the first capacitance C1, the first voltage-stabiliser tube
One end electrical connection of the cathode and second resistance R2 of ZD1.
The operation principle of the short-circuit detection protection circuit of 4th kind of structure provided in an embodiment of the present invention is：As the first MOS
When pipe Q1 normal works, the first metal-oxide-semiconductor Q1 drains are high-frequency switching signal, and high-frequency current flows through the first diode D1, the first electricity
The grid of R1 to the second metal-oxide-semiconductor Q2 is hindered, the gate-source voltage of the second metal-oxide-semiconductor Q2 is high level.At this point, the second metal-oxide-semiconductor Q2 conductings,
Electric current at LED anodes flows through the hourglass source electrode of LED and the second metal-oxide-semiconductor Q2；When hourglass source electrode short trouble occurs for the first metal-oxide-semiconductor Q1
When, the first metal-oxide-semiconductor Q1 drain-source electrode potentials are identical, are low potential, the first diode D1 cut-offs, no current the second metal-oxide-semiconductor of inflow
The gate-source voltage of the grid of Q2, the second metal-oxide-semiconductor Q2 is low level.At this point, the second metal-oxide-semiconductor Q2 cut-offs, no current flow through LED,
Then to realize the purpose of protection LED.
It will be understood by those skilled in the art that although preferred embodiments of the present invention have been described, but skill in the art
Art personnel once know basic creative concept, then additional changes and modifications may be made to these embodiments.So appended
Claim, which is intended to be construed to, to be included preferred embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from model of the invention by those skilled in the art
It encloses.In this way, if these modifications and changes of the present invention is within the scope of the claims of the present invention and its equivalent technology, then
The present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of short-circuit detection protection circuit, which is characterized in that including：
LED drive circuit, the LED drive circuit are electrically connected with LED, and the LED drive circuit includes the first metal-oxide-semiconductor；
Circuit is protected, the protection circuit and the LED are in parallel or series；
The both ends of short-circuit detecting circuit, the short-circuit detecting circuit are electrically connected with the protection circuit and first metal-oxide-semiconductor respectively
It connects；
Wherein, when the short-circuit detecting circuit detects that first metal-oxide-semiconductor breaks down, the short-circuit detecting circuit is to institute
It states protection circuit and sends out fault-signal, to drive the protection circuit to execute protection act to the LED.
2. short-circuit detection protection circuit according to claim 1, which is characterized in that
The short-circuit detecting circuit includes：First resistor, second resistance, 3rd resistor, the first capacitance, the second capacitance, the one or two
Pole pipe, the second diode and the first voltage-stabiliser tube, wherein
The both ends of the first resistor are electrically connected with one end of the drain electrode of first metal-oxide-semiconductor and first capacitance respectively, institute
The other end for stating the first capacitance is electrically connected with the cathode of the anode of first diode and second diode respectively, described
The cathode of first diode respectively with one end of second capacitance, the cathode of first voltage-stabiliser tube, the second resistance
One end is electrically connected, and the other end of the second resistance is electrically connected with one end of the 3rd resistor and the protection circuit respectively,
The other end of the 3rd resistor, first voltage-stabiliser tube positive, described second capacitance the other end and the two or two pole
The anode electrical connection of pipe.
3. short-circuit detection protection circuit according to claim 1, which is characterized in that
The short-circuit detecting circuit includes：First diode, first resistor, second resistance, the first capacitance and the first voltage-stabiliser tube,
In,
The anode of first diode is electrically connected with one end of the drain electrode of first metal-oxide-semiconductor and the first resistor respectively,
The other end of the first resistor respectively with one end of first capacitance, first voltage-stabiliser tube cathode, it is described second electricity
One end of resistance and protection circuit electrical connection, the other end of the second resistance, the anode of first voltage-stabiliser tube and described
The other end of first capacitance is electrically connected.
4. short-circuit detection protection circuit according to claim 2, which is characterized in that
The protection circuit includes the second metal-oxide-semiconductor；Wherein,
The drain electrode of second metal-oxide-semiconductor is electrically connected with the cathode of the LED；
The source electrode of second metal-oxide-semiconductor and the other end of the 3rd resistor, positive, described second electricity of first voltage-stabiliser tube
The anode electrical connection of the other end of appearance and second diode；
The grid of second metal-oxide-semiconductor is electrically connected with one end of the other end of the second resistance and the 3rd resistor respectively.
5. short-circuit detection protection circuit according to claim 2, which is characterized in that
The protection circuit includes：4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, third capacitance, the second voltage-stabiliser tube,
First thyristor and the second metal-oxide-semiconductor, wherein
The drain electrode of second metal-oxide-semiconductor respectively with one end of the 4th resistance, the cathode of second voltage-stabiliser tube and described the
One end of six resistance is electrically connected, and the other end of the 4th resistance is electrically connected with the anode of the LED, second voltage-stabiliser tube
Control pole of the anode respectively with one end of the 7th resistance, one end of the third capacitance and first thyristor is electrically connected
Connect, the anode of first thyristor is electrically connected with one end of the 5th resistance, the other end of the 5th resistance with it is described
The anode electrical connection of LED；
The source electrode of second metal-oxide-semiconductor, the cathode of first thyristor, the other end of the 7th resistance, third electricity
The other end of appearance, the other end of the 6th resistance, the other end of the 3rd resistor, the anode of first voltage-stabiliser tube, institute
State the anode electrical connection of the other end and second diode of the second capacitance；
The grid of second metal-oxide-semiconductor is electrically connected with one end of the other end of the second resistance and the 3rd resistor respectively.
6. short-circuit detection protection circuit according to claim 1 or 3, which is characterized in that
The protection circuit includes the second metal-oxide-semiconductor；Wherein,
The drain electrode of second metal-oxide-semiconductor is electrically connected with the cathode of the LED；
The source electrode of second metal-oxide-semiconductor is electrically connected with the short-circuit detecting circuit；
The grid of second metal-oxide-semiconductor is electrically connected with the short-circuit detecting circuit.
7. short-circuit detection protection circuit according to claim 6, which is characterized in that
The grid of second metal-oxide-semiconductor respectively with the other end of the first resistor, one end of first capacitance, described first
One end of the cathode of voltage-stabiliser tube and the second resistance is electrically connected；
The source electrode of second metal-oxide-semiconductor respectively with the other end of the second resistance, the anode of first voltage-stabiliser tube and described
The other end of first capacitance is electrically connected.
8. short-circuit detection protection circuit according to claim 1 or 3, which is characterized in that
The protection circuit includes：4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, third capacitance, the second voltage-stabiliser tube,
First thyristor and the second metal-oxide-semiconductor, wherein
The drain electrode of second metal-oxide-semiconductor respectively with one end of the 4th resistance, the cathode of second voltage-stabiliser tube and described the
One end of six resistance is electrically connected, and the other end of the 4th resistance is electrically connected with the anode of the LED, second voltage-stabiliser tube
Control pole of the anode respectively with one end of the 7th resistance, one end of the third capacitance and first thyristor is electrically connected
Connect, the anode of first thyristor is electrically connected with one end of the 5th resistance, the other end of the 5th resistance with it is described
The anode electrical connection of LED；
The source electrode of second metal-oxide-semiconductor, the cathode of first thyristor, the other end of the 7th resistance, third electricity
The other end of appearance, the 6th resistance the other end be electrically connected with the short-circuit detecting circuit；
The grid of second metal-oxide-semiconductor is electrically connected with the short-circuit detecting circuit.
9. short-circuit detection protection circuit according to claim 8, which is characterized in that
The grid of second metal-oxide-semiconductor respectively with the other end of the first resistor, one end of first capacitance, described first
One end of the cathode of voltage-stabiliser tube and the second resistance is electrically connected；
The source electrode of second metal-oxide-semiconductor respectively with the other end of the second resistance, the anode of first voltage-stabiliser tube and described
The other end of first capacitance is electrically connected.
10. short-circuit detection protection circuit according to claim 1, which is characterized in that
The LED drive circuit is BUCK circuits.
11. short-circuit detection protection circuit according to claim 10, which is characterized in that
The BUCK circuits include：Fuse, rectifier bridge, the first polar capacitor, the second polar capacitor, the first diode, first
Resistance, second resistance and the first inductance, wherein
One end of the fuse is electrically connected with Inductive ballast, the first end of the other end of the fuse and the rectifier bridge
Electrical connection, the second end of the rectifier bridge respectively with the cathode of positive, described first diode of first polar capacitor, institute
State one end and the LED anodes electrical connection of positive, the described first resistor of the second polar capacitor, the third end of the rectifier bridge
Be electrically connected with zero curve, the 4th end of the rectifier bridge respectively with the cathode of first polar capacitor and described second resistance one end
Electrical connection, the other end of the second resistance is electrically connected with the source electrode of first metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and
One end of first inductance is electrically connected, the other end of first inductance respectively with the cathode of second polar capacitor, institute
The other end electrical connection of first resistor is stated, the grid of first metal-oxide-semiconductor accesses drive signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108322963B (en) | 2024-03-05 |
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