CN105430805B - Driving power guard method and device, lamps and lanterns - Google Patents
Driving power guard method and device, lamps and lanterns Download PDFInfo
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- CN105430805B CN105430805B CN201510955016.2A CN201510955016A CN105430805B CN 105430805 B CN105430805 B CN 105430805B CN 201510955016 A CN201510955016 A CN 201510955016A CN 105430805 B CN105430805 B CN 105430805B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention provides a kind of driving power guard method and device, lamps and lanterns, the above method includes: to reduce primary side feedback signal when secondary side output positive and negative anodes are short-circuit or under-voltage；The amplified triggering primary side of reduced primary side feedback signal protects circuit；Primary side protects circuit to close power supply, to realize short-circuit protection or under-voltage protection.Technical solution provided by the invention improves the reliability of power supply, reduces secondary side signal detection route and feedback optocoupler, reduces product cost.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of driving power guard method and device, lamps and lanterns.
Background technique
Currently, to improve LED drive power reliability, when output short-circuit, leading to for LED power driving circuit
Often pair side uses amplifier sampling and outputting voltage signal, and sampled signal is transferred to primary side to realize defencive function, such as by optocoupler
Short-circuit protection, output under-voltage protection etc..
To realize above-mentioned defencive function, needs that secondary side signal is arranged on secondary side and detect route and feedback optocoupler.Secondary side signal
Detection route and the setting for feeding back optocoupler increase product cost, and the reliability of power supply is relatively low.
Summary of the invention
The present invention is to provide a kind of driving power guard method and device, lamps and lanterns to overcome the above problem or at least portion
It solves the above problems with dividing.
According to an aspect of the invention, there is provided a kind of driving power guard method, comprising:
When secondary side output positive and negative anodes are short-circuit or under-voltage, primary side feedback signal is reduced；
The amplified triggering primary side of reduced primary side feedback signal protects circuit；
The primary side protection circuit closes power supply, to realize short-circuit protection or under-voltage protection.
Optionally, the above method further include:
When secondary side feedback route open loop, the primary side protection circuit is triggered, the primary side protection circuit closes power supply, with
Realize open-circuit-protection.
Optionally, described when secondary side output positive and negative anodes are short-circuit or under-voltage, reducing primary side feedback signal includes:
When the pair side output positive and negative anodes are short-circuit or under-voltage, a reference source (U3) output voltage is increased, and flows through the first optocoupler
Primary side LED current reduces clutch (U1) in vivo.
Optionally, the amplified triggering primary side protection circuit of the reduced primary side feedback signal includes:
Flowing through first photo-coupler (U1), primary side LED current reduces in vivo, then flows through first optocoupler
The electric current of clutch (U1) pair side triode reduces；
First resistor (R8) both end voltage changes, and the voltage of variation is transferred to primary side logical drive chip (U2)
INV foot, signal is amplified by primary side logical drive chip (U2) internal arithmetic so that the raising of OUT foot output voltage, triggering
The primary side protects circuit.
Optionally, primary side protection circuit closes power supply, to realize short-circuit protection or under-voltage protection includes:
The OUT foot output voltage of the primary side logical drive chip (U2) increases, by first diode (D3), the second electricity
After hindering (R7), first capacitor (C4) filtering, interlocking line is triggered；
The interlocking line drags down the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2), closes power supply,
To realize short-circuit protection or under-voltage protection.
Optionally, described when secondary side feedback route open loop, the primary side protection circuit is triggered, the primary side protects circuit
Power supply is closed, to realize that open-circuit-protection includes:
When the secondary side feedback route open loop, the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2)
Rise, the power supply decomposition voltage (VCC) of rising triggers the mutual locking wire through 3rd resistor (R2), the second diode (D1)
Road；
The interlocking line drags down the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2), closes power supply,
To realize open-circuit-protection.
According to another aspect of the present invention, a kind of driving power protective device is additionally provided, comprising: primary side feedback electricity
Road, electric power driving module, primary side protect circuit,
When secondary side output positive and negative anodes are short-circuit or under-voltage, the primary side feedback circuit reduces primary side feedback signal, reduction
Primary side feedback signal triggers the primary side protection circuit after electric power driving module amplification, and the primary side protection circuit is closed
Power supply, to realize short-circuit protection or under-voltage protection.
Optionally, above-mentioned apparatus further includes primary side trigger circuit,
When secondary side feedback route open loop, primary side described in the primary side trigger circuit triggers protects circuit, and the primary side is protected
Protection circuit closes power supply, to realize open-circuit-protection.
Optionally, the primary side feedback circuit includes: a reference source (U3), the first photo-coupler (U1), first resistor (R8),
The cathode of a reference source (U3) is connected to the cathode of the interior primary side light emitting diode of the first photo-coupler (U1), and described first
The emitter of secondary side triode is connected to the first resistor (R8) in photo-coupler (U1),
When output positive and negative anodes are short-circuit or under-voltage, a reference source (U3) output voltage is increased, and flows through first optocoupler
Primary side LED current reduces clutch (U1) in vivo, then flows through the electric current of the secondary side triode of first photo-coupler (U1)
Reduce, first resistor (R8) both end voltage changes.
Optionally, the electric power driving module includes primary side logical drive chip (U2),
The voltage of first resistor (R8) variation is transferred to the INV foot of the primary side logical drive chip (U2), signal
Amplified by primary side logical drive chip (U2) internal arithmetic so that OUT foot output voltage increases.
Optionally, primary side protection circuit include first diode (D3), second resistance (R7), first capacitor (C4) and
Interlocking line, the anode of the first diode (D3) are connected to primary side logical drive chip (U2) the OUT foot, cathode connection
To the second resistance (R7), the second resistance (R7) is connected to the first capacitor (C4) and interlocking line,
Primary side logical drive chip (U2) the OUT foot output voltage increases, by the first diode (D3), second
After resistance (R7), first capacitor (C4) filtering, the interlocking line is triggered, the interlocking line drags down the primary side logical drive
The power supply decomposition voltage (VCC) of chip (U2) closes power supply, to realize short-circuit protection or under-voltage protection.
Optionally, including primary side trigger circuit 3rd resistor (R2), the second diode (D1), the 3rd resistor (R2) connect
It is connected to the cathode of power supply decomposition voltage (VCC) and second diode (D1), it is described to state the second diode (D1) just
Pole is connected to the interlocking line,
When the secondary side feedback route open loop, the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2)
Rise, the power supply decomposition voltage (VCC) of rising is through described in the 3rd resistor (R2), second diode (D1) triggering
Interlocking line, the interlocking line drag down the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2), close electricity
Source, to realize open-circuit-protection.
According to a further aspect of the invention, a kind of lamps and lanterns are additionally provided, comprising: luminescence unit is connected to described shine
Unit include any of the above-described driving power protective device power supply.
Technical solution provided by the invention realizes short circuit, the output under-voltage protection of power supply by way of primary-side-control
Function improves the reliability of power supply, reduces secondary side signal detection route and feedback optocoupler, reduces product cost.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the flow chart of driving power guard method according to an embodiment of the invention；
Fig. 2 is the flow chart of driving power guard method in accordance with a preferred embodiment of the present invention；
Fig. 3 is the circuit diagram according to the driving power short-circuit protection circuit of traditional technology；
Fig. 4 is the circuit diagram of driving power protection circuit in accordance with a preferred embodiment of the present invention；
Fig. 5 is the structural block diagram of driving power protective device according to an embodiment of the invention；
Fig. 6 is the structural block diagram of driving power protective device in accordance with a preferred embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.It should be noted that under the premise of not conflicting, the embodiment of the present invention and implementation
Technical characteristic in example can be combined with each other.
Fig. 1 is the flow chart of driving power guard method according to an embodiment of the invention.As shown in Figure 1, above-mentioned side
Method includes:
Step S102 reduces primary side feedback signal when secondary side output positive and negative anodes are short-circuit or under-voltage；
Step S104, the amplified triggering primary side of reduced primary side feedback signal protect circuit；
Step S106, primary side protects circuit to close power supply, to realize short-circuit protection or under-voltage protection.
Technical solution based on the embodiment of the present invention does not use biography when carrying out short-circuit protection to driving power
The protection application of the driving power of the secondary side feedback of system, but the short circuit of power supply, output are realized by way of primary-side-control
Under-voltage protection function reduces secondary side signal detection route and feedback optocoupler, reduces production to improve the reliability of power supply
Product cost, increases the market competitiveness.
Optionally, open-circuit-protection can also be realized based on above-mentioned primary side protection circuit, as shown in Fig. 2, the above method may be used also
To include:
Step S108, when secondary circuit open loop, triggering primary side protects circuit, and primary side protects circuit to close power supply, with reality
Existing open-circuit-protection.
Due to the presence of primary side protection circuit, open-circuit-protection can also be realized on its basis, i.e., open loop occurs on secondary side
When, it also triggers primary side and protects circuit, power supply is closed, to realize open-circuit-protection.It should be noted that above-mentioned steps S108 and step
S102-S106 there is no stringent context, in Fig. 2 in description need for step S108 to be placed on step S106 it
Afterwards, in the specific implementation, it needs according to the step for executing correspondence the case where appearance.
Fig. 3 is the circuit diagram according to the driving power short-circuit protection circuit of traditional technology.As shown in figure 3, using tradition
Secondary side feedback LED drive power protection in application, corresponding setting secondary side signal is needed to detect route and feedback optocoupler
(including resistance R12, resistance R13, resistance R15, resistance R16, resistance R17, resistance R18, resistance R20, resistance R21, capacitor C5,
Capacitor C6, chip U5, diode D4, diode D5 and feedback optocoupler U4, resistance R11 etc.).
Fig. 4 is the circuit diagram of driving power protection circuit in accordance with a preferred embodiment of the present invention.As shown in figure 4, defeated
Positive and negative anodes short circuit or when under-voltage output out, sampling resistor R4, R9 of output voltage Vout divide decline, through with inside a reference source U3
2.5V benchmark relatively after, a reference source U3 output voltage increase, flow through primary side LED current in the first photo-coupler U1 body
Reduce, then the electric current Ice for flowing through the first photo-coupler U1 pair side triode reduces, and first resistor R8 both end voltage changes.
Variation voltage Δ V is transferred to 1 foot of primary side logical drive chip U2, and signal is made by amplifier inside primary side logical drive chip U2
It obtains 2 feet (OUT) output voltage to increase, after first diode D3, second resistance R7, first capacitor C4 filtering, causes to interlock
Route triggering, interlocking line are made of triode Q1, triode Q2, resistance R5, capacitor C1, resistance R10, capacitor C3, mutual locking wire
After the triggering of road, two triodes Q1, Q2 are connected rapidly, and the similar decomposition voltage VCC and ground GND that will power of function is through resistance R1 current limliting
It is short-circuit afterwards, so as to cause primary side logical drive chip U2 power supply decomposition voltage VCC can be discharged by resistance R1 after reduce rapidly,
Power supply decomposition voltage VCC is pulled low, and when the decomposition voltage VCC that powers is lower than work shutdown threshold, power supply stops working, and reaches defeated
Short-circuit protection or the effect of output under-voltage protection out.
And work as secondary side feedback route, including output voltage sampling circuit (including resistance R4, resistance R9, capacitor C2, a reference source
U3) and the first photo-coupler U1, failure lead to power supply output open circuit, i.e. feed circuit failure, secondary side feedback route is in
When open loop situations, the power supply decomposition voltage VCC of primary side logical drive chip U2 can rise, thus through 3rd resistor R2, the two or two
After pole pipe D1, interlocking line can also be triggered, closes power supply, achievees the effect that output open circuit is protected.
Optionally, the model of a reference source U3 can be TL431, this is a kind of controllable accurate source of stable pressure, its output voltage
It can be arbitrarily arranged with two resistance to any value from 2.5V to 36V in range, be replaced surely with it in many applications
Press diode.
Optionally, the model of primary side logical drive chip U2 can be ST L6562A or similar functions IC, be power supply master
IC is controlled, can detecte secondary side feedback signal, it is defeated by adjusting PWM (Pulse Width Modulation, pulse width modulation)
Out, external MOS is controlled, realizes that output voltage or electric current are constant.It is mainly concerned with INV foot and COMP therein in the present invention
Foot, INV foot are the negative-phase inputs (1 foot of above-mentioned U2) of error amplifier, and COMP foot is the output end of error amplifier (on i.e.
OUT foot, 2 feet of the U2 stated).
Protection circuit based on shown in Fig. 4, driving power saves secondary frontier inspection survey line road and feedback optocoupler, to improve
Reliability reduces product cost.
Fig. 5 is the structural block diagram of driving power protective device according to an embodiment of the invention.As shown in figure 5, above-mentioned
Driving power protective device includes: primary side feedback circuit 51, electric power driving module 52, primary side protection circuit 53, when secondary side exports
When positive and negative anodes are short-circuit or under-voltage, primary side feedback circuit 51 reduces primary side feedback signal, and reduced primary side feedback signal drives through power supply
Triggering primary side protects circuit 53 after dynamic model block 52 amplifies, and primary side protects circuit 53 to close power supply, to realize short-circuit protection.
Technical solution based on the embodiment of the present invention does not use biography when carrying out short-circuit protection to driving power
The protection application of the LED drive power of the secondary side feedback of system, but the short of LED power is realized by way of primary-side-control
Road, output under-voltage protection function reduce secondary side signal detection route and feedback optocoupler to improve the reliability of power supply,
Product cost is reduced, the market competitiveness is increased.
Optionally, open-circuit-protection can also be realized based on above-mentioned primary side protection circuit 53, as shown in fig. 6, above-mentioned apparatus is also
May include:
Primary side trigger circuit 54, when secondary side feedback route open loop, primary side trigger circuit 54 triggers primary side and protects circuit 53,
Primary side protects circuit 53 to close power supply, to realize open-circuit-protection.
Due to the presence of primary side protection circuit 53, open-circuit-protection can also be realized on its basis, i.e., is opened on secondary side
When ring, primary side protection circuit is also triggered by primary side trigger circuit 54, power supply is closed, to realize open-circuit-protection.
In the specific implementation, the corresponding circuit of above-mentioned apparatus can be used as a part realization of entire product circuit, preferably
Can be used as power supply a part realize, can not necessarily be realized in a manner of self-contained unit.
The driving power protective device provided based on the above embodiment, Fig. 4 give a preferred circuit diagram.Such as Fig. 4
Shown, primary side feedback circuit 51 includes: a reference source U3, the first photo-coupler U1, first resistor R8, the cathode connection of a reference source U3
The cathode of primary side light emitting diode in the first photo-coupler U1, the emitter connection of secondary side triode in the first photo-coupler U1
To first resistor R8, when exporting positive and negative anodes short circuit or under-voltage output, sampling resistor R4, R9 of output voltage Vout divides decline
After compared with 2.5V benchmark inside a reference source U3, a reference source U3 output voltage is increased, and is flowed through former in the first photo-coupler U1 body
Side LED current reduces, then the electric current Ice for flowing through the first photo-coupler U1 pair side triode reduces, first resistor R8 two
End voltage changes.Electric power driving module 52 includes primary side logical drive chip U2, and the voltage Δ V of first resistor R8 variation is passed
It is handed to 1 (INV) foot of primary side logical drive chip U2, signal makes OUT by amplifier inside primary side logical drive chip U2
(COMP) foot output voltage increases.Primary side protect circuit 53 include first diode D3, second resistance R7, first capacitor C4 and mutually
Locking wire road, the anode of first diode D3 are connected to the OUT foot of primary side logical drive chip U2, and cathode is connected to second resistance
R7, second resistance R7 are connected to first capacitor C4 and interlocking line, the OUT foot output voltage liter of primary side logical drive chip U2
Height triggers interlocking line, interlocking line is by triode after first diode D3, second resistance R7, first capacitor C4 filtering
Q1, triode Q2, resistance R5, capacitor C1, resistance R10, capacitor C3 composition, after interlocking line triggering, two triodes Q1, Q2 are fast
Speed conducting, the similar decomposition voltage VCC and GND that will power of function is short-circuit after resistance R1 current limliting, so as to cause primary side logical drive
Chip U2 power supply decomposition voltage VCC is reduced rapidly after capable of being discharged by resistance R1, and power supply decomposition voltage VCC is pulled low, and works as power supply
When decomposition voltage VCC is lower than work shutdown threshold, power supply stops working, and reaches output short circuit protection or exports the effect of under-voltage protection
Fruit.
And work as secondary side feedback route, including output voltage sampling circuit (including resistance R4, resistance R9, capacitor C2, a reference source
U3) and the first photo-coupler U1, failure lead to power supply output open circuit, i.e. feed circuit failure, secondary side feedback route is in
When open loop situations, the power supply decomposition voltage VCC of primary side logical drive chip U2 can rise, and primary side trigger circuit 54 includes third electricity
R2, the second diode D1 are hindered, the power supply decomposition voltage VCC of rising can also be triggered after 3rd resistor R2, the second diode D1
Interlocking line closes power supply, achievees the effect that output open circuit is protected.
Further, the embodiment of the invention also provides a kind of lamps and lanterns, comprising: luminescence unit is connected to luminescence unit
It include the power supply of any of the above-described driving power protective device.
Above-mentioned driving power protective device is highly suitable on lamps and lanterns, especially LED lamp.The basis knot of one lamps and lanterns
Structure includes luminescence unit and the power supply for luminescence unit power supply, and above-mentioned driving power protective device can be set on power supply.
Certainly, above-mentioned driving power protective device also can be applied in other scenes, and the present invention is not especially limited.
Technical solution provided in an embodiment of the present invention can realize the short circuit of power supply, output by way of primary-side-control
Under-voltage protection function improves the reliability of power supply, reduce secondary side signal detection route and feedback optocoupler, reduce product at
This, increases the market competitiveness.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that implementation of the invention
Example can be practiced without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this specification.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of the various inventive aspects,
Above in the description of exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the disclosed method should not be interpreted as reflecting the following intention: i.e. required to protect
Shield the present invention claims features more more than feature expressly recited in each claim.More precisely, as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim itself
All as a separate embodiment of the present invention.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments mean it is of the invention
Within the scope of and form different embodiments.For example, in detail in the claims, embodiment claimed it is one of any
Can in any combination mode come using.
Various component embodiments of the invention can be implemented in hardware, or to run on one or more processors
Software module realize, or be implemented in a combination thereof.It will be understood by those of skill in the art that can be used in practice
Microprocessor or digital signal processor (DSP) realize one in driving power protective device according to an embodiment of the present invention
The some or all functions of a little or whole components.The present invention is also implemented as executing method as described herein
Some or all device or device programs (for example, computer program and computer program product).Such realization
Program of the invention can store on a computer-readable medium, or may be in the form of one or more signals.This
The signal of sample can be downloaded from an internet website to obtain, and is perhaps provided on the carrier signal or mentions in any other forms
For.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and ability
Field technique personnel can be designed alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference symbol between parentheses should not be configured to limitations on claims.Word "comprising" does not exclude the presence of not
Element or step listed in the claims.Word "a" or "an" located in front of the element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of several different elements and being come by means of properly programmed computer real
It is existing.In the unit claims listing several devices, several in these devices can be through the same hardware branch
To embody.The use of word first, second, and third does not indicate any sequence.These words can be explained and be run after fame
Claim.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows
Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all such other variations or modifications.
Claims (12)
1. a kind of driving power guard method, comprising:
When secondary side output positive and negative anodes are short-circuit or under-voltage, primary side feedback signal is reduced；
The amplified triggering primary side of reduced primary side feedback signal protects circuit；
The primary side protection circuit closes power supply, to realize short-circuit protection or under-voltage protection；
It is described when the short circuit of secondary side output positive and negative anodes or it is under-voltage when, reduce primary side feedback signal, comprising: when the secondary side output is positive and negative
Extremely short road or it is under-voltage when, a reference source (U3) output voltage increases, and flows through the first photo-coupler (U1) primary side light emitting diode in vivo
Electric current reduce.
2. according to the method described in claim 1, wherein, further includes:
When secondary side feedback route open loop, the primary side protection circuit is triggered, the primary side protection circuit closes power supply, to realize
Open-circuit-protection.
3. according to the method described in claim 2, wherein, the amplified triggering primary side of reduced primary side feedback signal is protected
Circuit includes:
Flowing through first photo-coupler (U1), primary side LED current reduces in vivo, then flows through first photo-coupler
(U1) electric current of secondary side triode reduces；
First resistor (R8) both end voltage changes, and the voltage of variation is transferred to the INV foot of primary side logical drive chip (U2),
Signal is amplified by primary side logical drive chip (U2) internal arithmetic so that the raising of OUT foot output voltage, triggers the original
Protect circuit in side.
4. the primary side protection circuit closes power supply according to the method described in claim 3, wherein, with realize short-circuit protection or
Under-voltage protection includes:
The OUT foot output voltage of the primary side logical drive chip (U2) increases, by first diode (D3), second resistance
(R7), after first capacitor (C4) filtering, interlocking line is triggered；
The interlocking line drags down the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2), power supply is closed, with reality
Existing short-circuit protection or under-voltage protection.
5. it is described when secondary side feedback route open loop according to the method described in claim 4, wherein, trigger the primary side protection
Circuit, primary side protection circuit close power supply, to realize that open-circuit-protection includes:
When the secondary side feedback route open loop, the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2) rises,
The power supply decomposition voltage (VCC) risen triggers the interlocking line through 3rd resistor (R2), the second diode (D1)；
The interlocking line drags down the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2), power supply is closed, with reality
Existing open-circuit-protection.
6. a kind of driving power protective device, comprising: primary side feedback circuit, electric power driving module, primary side protect circuit,
When secondary side output positive and negative anodes are short-circuit or under-voltage, the primary side feedback circuit reduces primary side feedback signal, reduced primary side
Feedback signal triggers the primary side protection circuit after electric power driving module amplification, and the primary side protection circuit closes electricity
Source, to realize short-circuit protection or under-voltage protection；
The primary side feedback circuit includes: a reference source (U3) and the first photo-coupler (U1), and the cathode of a reference source (U3) connects
It is connected to the cathode of the interior primary side light emitting diode of the first photo-coupler (U1), when secondary side output positive and negative anodes are short-circuit or under-voltage,
A reference source (U3) output voltage increases, and the electric current for flowing through the internal primary side light emitting diode of the first photo-coupler (U1) reduces.
7. device according to claim 6, wherein it further include primary side trigger circuit,
When secondary side feedback route open loop, primary side described in the primary side trigger circuit triggers protects circuit, the primary side protection electricity
Power supply is closed on road, to realize open-circuit-protection.
8. device according to claim 7, wherein the primary side feedback circuit further include: first resistor (R8), described
The emitter of secondary side triode is connected to the first resistor (R8) in one photo-coupler (U1),
When output positive and negative anodes are short-circuit or under-voltage, a reference source (U3) output voltage is increased, and flows through first photo-coupler
(U1) electric current of primary side light emitting diode reduces in vivo, then the electric current for flowing through the secondary side triode of first photo-coupler (U1) subtracts
Small, first resistor (R8) both end voltage changes.
9. device according to claim 8, wherein the electric power driving module includes primary side logical drive chip (U2),
The voltage of first resistor (R8) variation is transferred to the INV foot of the primary side logical drive chip (U2), and signal passes through
Primary side logical drive chip (U2) internal arithmetic is amplified so that OUT foot output voltage increases.
10. device according to claim 9, wherein the primary side protection circuit includes first diode (D3), the second electricity
Resistance (R7), first capacitor (C4) and interlocking line, the anode of the first diode (D3) are connected to the primary side logical drive
Chip (U2) OUT foot, cathode are connected to the second resistance (R7), and the second resistance (R7) is connected to the first capacitor
(C4) and interlocking line,
Primary side logical drive chip (U2) the OUT foot output voltage increases, by the first diode (D3), second resistance
(R7), after first capacitor (C4) filtering, the interlocking line is triggered, the interlocking line drags down the primary side logical drive chip
(U2) power supply decomposition voltage (VCC) closes power supply, to realize short-circuit protection or under-voltage protection.
11. device according to claim 10, the primary side trigger circuit include primary side trigger circuit 3rd resistor (R2),
Second diode (D1), the 3rd resistor (R2) are connected to the power supply decomposition voltage (VCC) and second diode
(D1) cathode, the anode for stating the second diode (D1) are connected to the interlocking line,
When the secondary side feedback route open loop, the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2) rises,
The power supply decomposition voltage (VCC) risen triggers the interlocking through the 3rd resistor (R2), second diode (D1)
Route, the interlocking line drag down the power supply decomposition voltage (VCC) of the primary side logical drive chip (U2), close power supply, with
Realize open-circuit-protection.
12. a kind of lamps and lanterns, comprising: luminescence unit, be connected to the luminescence unit includes any one of claim 6-10 institute
The power supply for the driving power protective device stated.
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| CN205196015U (en) * | 2015-12-17 | 2016-04-27 | 欧普照明股份有限公司 | Drive power supply protection device , lamps and lanterns |
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| JPH0714690A (en) * | 1993-06-22 | 1995-01-17 | Matsushita Electric Ind Co Ltd | Electric discharge lamp lighting system |
| CN102063872A (en) * | 2009-11-16 | 2011-05-18 | 康佳集团股份有限公司 | LCD backlight power circuit with high-voltage short-circuit protection |
| CN101711070A (en) * | 2009-11-18 | 2010-05-19 | 海洋王照明科技股份有限公司 | LED direct-current input control circuit |
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|---|---|
| CN105430805A (en) | 2016-03-23 |
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