CN110167227A - Open loop protection circuit, power supply circuit, open-circuit-protection method and lighting device - Google Patents
Open loop protection circuit, power supply circuit, open-circuit-protection method and lighting device Download PDFInfo
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- CN110167227A CN110167227A CN201810152315.6A CN201810152315A CN110167227A CN 110167227 A CN110167227 A CN 110167227A CN 201810152315 A CN201810152315 A CN 201810152315A CN 110167227 A CN110167227 A CN 110167227A
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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]
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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 relates to a kind of open loop protection circuit, open-circuit-protection method, power supply circuit and lighting devices.The open loop protection circuit is used in the power supply circuit with LED load module and switch element, the open loop protection circuit includes control circuit, and the Vf peak levels detector of the open loop state for detecting LED load module, the Vf peak levels detector includes transistor, clamp element, first resistor, the emitter of the transistor is connected with LED load module, collector is through first resistor, and one second resistance be connected with the GND terminal of control circuit, and the tie point through first resistor and second resistance and the DIM terminal of control circuit connect, base stage is connected with the cathode of clamp element, the anode of clamp element is connected with the GND terminal of control circuit；The switch element and OUT terminal of control circuit connect.The present invention can reduce LED load and the impaired probability of control circuit in power supply circuit when LED load module contact is bad, mitigate circuit burden, can be efficiently used for the daily maintenance of lighting device.
Description
Technical field
The present invention relates to a kind of open loop protection circuit, power supply circuit, open-circuit-protection methods.Open-circuit-protection electricity of the invention
Road, power supply circuit and open-circuit-protection method are particularly suitable in the lighting device comprising light emitting diode (LED).
Background technique
Currently, load open circuit protection circuit part is integrated into the control module of lighting device, so that the LED of lighting device
Power supply change-over device has open circuit protecting function in LED desoldering or damage, is common practice.
But industry still has the LED power conversion equipment of many lighting devices, does not have output open circuit protecting function.Fig. 1
(a) a kind of transformer simplex winding connection circuit of no open circuit protecting function is shown, transformer is simplex winding mode, both without detection
Winding can not detect open circuit signaling LED load open circuit, therefore SW can not be allowed to open also without Vf peak voltage detector
It closes component to stop working, Fig. 1 (b) shows a kind of transformer winding same-phase access way of no open circuit protecting function, uses
Same-phase accesses circuit between transformer winding, even if LED load is opened a way, can not also detect open circuit signaling, therefore SW can not be allowed to open
It closes component to stop working, Fig. 1 (c) shows antiphase access way between the transformer winding of no open circuit protecting function a kind of, adopts
With antiphase winding mode between transformer winding, but detecting signal can not be immediately passed to SW switch block, even if LED load
Open circuit can not also detect exception, therefore SW switch block can not be allowed to stop working.The scheme of Fig. 1 (a)-Fig. 1 (c) does not all account for
To LED power conversion equipment be usually LED load supply setting electric current, LED load just can clamp load voltage, therefore electricity
The voltage that supply changeover device is applied to load both ends is safe, but is loaded after open circuit, and it is negative that circuit will be continuously LED
Carry the electric current of supply setting, and the voltage of output port (load both ends) is due to the clamping action of not no LED, output port voltage
Abnormal to increase, then output capacitor is constantly in charged state, and without charge discharging resisting path, voltage may become very
Height, and the voltage on output terminal may become very high as a result, and this is potential danger, and may cause the ministry of electronics industry
The damage of part.Become no longer safe.One side LED power converter failure meeting further expansion, causes damage of internal device,
Eventually lead to failure；On the other hand, abnormal high when LED load is accessed LED power converter output end mouth by moment again
Voltage may also be LED load punch through damage.
Summary of the invention
In view of the above-mentioned problems, it is an object of the present invention to provide a kind of simple circuit structure, being added to existing does not have
In the control circuit of the LED power conversion equipment of standby output open circuit protecting function, it is set to have open circuit protecting function, with lower
Cost realizes the service life of the control circuit and lighting device that extend LED power conversion equipment.
One aspect of the present invention provides a kind of open loop protection circuit, for the confession with LED load module and switch element
In circuit, it is characterised in that: the open loop protection circuit includes control circuit and the open circuit for detecting LED load module
The Vf peak levels detector of situation, the Vf peak levels detector include transistor (Q1), clamp element, first resistor
(R3), the emitter of the transistor (Q1) is connected with LED load module, and collector is through first resistor (R3) and second
Resistance (R4) is connected with the GND terminal of control circuit and tie point and control through first resistor (R3) and second resistance (R4)
The DIM terminal of circuit processed connects, and base stage is connected with the cathode of clamp element, the anode and the GND of control circuit of clamp element
Terminal is connected；The switch element and OUT terminal of control circuit connect.
Another aspect of the present invention provides a kind of open loop protection circuit, for LED load module and switch element
In power supply circuit, it is characterised in that: the open loop protection circuit includes control circuit and for detecting opening for LED load module
The Vf peak levels detector of road situation, the Vf peak levels detector include transistor (Q1), clamp element, first resistor
(R3), the emitter of the transistor (Q1) is connected to the VCC terminal of control circuit, and collector is through first resistor (R3) and control
The DIM terminal of circuit connects, and is connected through first resistor (R3), second resistance (R4) with the GND terminal of control circuit, base stage
It is connected with the cathode of clamp element, the anode of clamp element is connected with the GND terminal of control circuit；The switch element with
OUT terminal of control circuit connects.
Further, the power supply circuit further includes for the first voltage supply circuit to LED load module for power supply, institute
The voltage status for stating Vf peak levels detector detection first voltage supply circuit, if the voltage is not above the first threshold
Value, then control switch element is to first voltage supply circuit normal power supply for control circuit, if the voltage is more than described first
Threshold value, then control switch element disconnects control circuit, stops powering to first voltage supply circuit, the control circuit is by changing
Change is applied to the voltage of the grid of switch element to carry out switching on and off control to switch element.
Further, the power supply circuit further include for give LED load module for power supply first voltage supply circuit, with
And the second voltage supply circuit powered for the VCC terminal to control circuit, the Vf peak levels detector detection second
The voltage status of voltage supply circuit, if the voltage is not above second threshold, if control circuit control switch element to
First voltage supply circuit normal power supply, if the voltage is more than the second threshold, control switch element if control circuit
It disconnects, stops powering to first voltage supply circuit, the control circuit is applied to the electricity of the grid of switch element by changing
Pressure is to carry out switch element to switch on and off control.
Further, the power supply circuit further includes transformer, and the primary coil and secondary coil of the transformer are anti-
To winding.
Further, the transistor (Q1) is PNP transistor, and the clamp element is Zener diode, described first
Threshold value is the normal clamp value of the clamp element.
Another aspect of the present invention provides a kind of power supply circuit, characterized by comprising: open loop protection circuit above-mentioned, LED
Load blocks and switch element.
Further, the power supply circuit, further includes: AC power source；Current rectifying and wave filtering circuit is supplied from the AC power source
The alternating current given is rectified；Transformer including primary coil and secondary coil；First voltage supply circuit, Xiang Suoshu
LED load module supplies the voltage between the both ends of above-mentioned primary coil；Second voltage supply circuit, at above-mentioned switch element
The voltage induced in above-mentioned secondary coil is supplied to the VCC terminal of the control circuit when on-state.
Further, the current rectifying and wave filtering circuit, including rectification circuit, be connected between the output end of rectification circuit first
Capacitor (C3) and the 3rd resistor (R7) being connected between rectification circuit (DB1) and AC power source；The first voltage supplies
To circuit, including the first diode (D2) and the second capacitor (C2) that are connected in series between the both ends of primary coil and with
The anode of the 5th resistance (R5) that two capacitors (C2) are connected in parallel, the first diode (D2) is connected to primary coil and opens
The tie point between element is closed, cathode is connected to the second capacitor (C2), the both ends of the second capacitor (C2) and LED load module
Both ends are connected；The second voltage supply circuit, including be connected to control circuit VCC terminal and current rectifying and wave filtering circuit it is low
Third capacitor (C1) and the positive secondary wire via one the 6th resistance (R1) and transformer between the output end of current potential side
The one end of circle connects and the second diode (D1) of cathode and the connection of the VCC terminal of control circuit, the secondary coil it is another
The connection of the GND terminal of one end and control circuit.
Another aspect of the present invention provides a kind of open-circuit-protection method of open loop protection circuit, which is characterized in that including following
Step: detect whether the LED load module opens a way；When do not detect the LED load module there are when open-circuit fault, control
Circuit processed then first voltage supply circuit normal power supply of the control switch element into power supply circuit, if detecting the LED
Load blocks are there are when open-circuit fault, and then control switch element stops the supply electricity of the first voltage into power supply circuit to control circuit
Road normal power supply.
Another aspect of the present invention provides a kind of open loop protection circuit, for LED load module, inductance (T2), VCC electricity
In the power supply circuit of source module, it is characterised in that: the open loop protection circuit includes control circuit and for detecting LED load
The Vf peak levels detector of the open loop state of module, the Vf peak levels detector include transistor (Q2), clamp element
(VT), the emitter of the transistor is connected to the GND terminal of control circuit, the COMP terminal company of collector and control circuit
It connecing, base stage is connected with the anode of clamp element, and the cathode of clamp element is connect with the tie point of inductance and VCC power module,
The inductance other end is powered by VCC power module to the VCC terminal of control circuit；The control circuit includes internal switch member
Part.
Further, the power supply circuit further includes for the voltage supply circuit to LED load module for power supply, the Vf
Peak levels detector detects the voltage status of voltage supply circuit, if the voltage is not above a first threshold, control
Module controls internal switch element to voltage supply circuit normal power supply, if the voltage is more than the first threshold, control
Circuit control internal switch element disconnects, and stops powering to voltage supply circuit.
Further, the open loop protection circuit further includes the electric current being connected between inductance and the CS terminal of control circuit
Inspection unit, the control circuit detect the state of Vf peak levels detector according to the voltage of COMP terminal, examine in conjunction with electric current
The state for knowing unit controls power supply output via internal switch element.
Further, the power supply circuit further includes that electronic switch flashes prevention unit and plastic filter circuit, described
The both ends of electronic switch flashing prevention unit connects with the output end of plastic filter circuit respectively, controlled end and inductance and
The tie point of LED load module is connected.
Further, the transistor is NPN transistor, and the clamp element is Zener diode, the first threshold
It is the normal clamp value of the clamp element；And/or the inductance is tap inductor, by VCC power module and clamp element
One end is connected to inductance centre cap.
Another aspect of the present invention provides a kind of power supply circuit, characterized by comprising: open loop protection circuit above-mentioned and
LED load module.
Further, the power supply circuit, which is characterized in that further include: AC power source；Current rectifying and wave filtering circuit, to from
The alternating current of the AC power source supply is rectified；Inductance, for control circuit VCC terminal and LED load module supply
Electricity；The voltage that inductance generates is supplied to the LED load module by voltage supply circuit；And/or electronic switch flashing is anti-
Stop element, for preventing the abnormal flashing of LED load module.
Further, the current rectifying and wave filtering circuit is filtered including rectification circuit, the LC being connected between the output end of rectification circuit
Wave device and third capacitor (C3) and the 3rd resistor (R7) being connected between rectification circuit and AC power source, the LC filter
Wave device and third capacitor are connected in parallel；And/or the voltage supply circuit, including respectively with LED load wired in parallel
Four capacitors (C4), the 5th resistance (R9)；And/or the both ends of the electronic switch flashing prevention unit are filtered with shaping respectively
The output end of wave circuit connects, and controlled end is connected with the tie point of inductance and LED load module.
Another aspect of the present invention provides a kind of open-circuit-protection method of open loop protection circuit, which is characterized in that including following
Step: detect whether the LED load module opens a way；When do not detect the LED load module there are when open-circuit fault, control
Molding block controls voltage supply circuit normal power supply of the internal switch element into power supply circuit, if detecting that the LED is negative
Module is carried there are when open-circuit fault, control module control internal switch element is stopping the voltage supply circuit into power supply circuit just
Often power supply.
Another aspect of the present invention provides a kind of lighting device, which is characterized in that uses open loop protection circuit above-mentioned, or makes
Use power supply circuit above-mentioned as the control unit of the lighting device.
According to the solution of the present invention, it is negative that LED in power supply circuit can be reduced when LED load module contact is bad
It carries and the impaired probability of control circuit, mitigation circuit burden can be efficiently used for the daily maintenance of lighting device.
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 can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 (a) is a kind of transformer simplex winding connection circuit of no open circuit protecting function in the prior art；
Fig. 1 (b) is a kind of connection of the transformer winding same-phase access way of no open circuit protecting function in the prior art
Circuit；
Fig. 1 (c) is a kind of company of antiphase access way between transformer winding of no open circuit protecting function in the prior art
Connect circuit；
Fig. 2 is the protection circuit of output open circuit sample point；
Fig. 3 is the protection circuit of inductance auxiliary winding reverse phase sampling；
Fig. 4 is the protection circuit of inductance simplex winding inductance sampling；
Fig. 5 is the circuit diagram of power supply circuit according to an embodiment of the present invention；
Fig. 6 is the circuit diagram of power supply circuit according to an embodiment of the present invention；
Fig. 7 is the circuit diagram of power supply circuit according to an embodiment of the present invention；
Fig. 8 is the schematic diagram of electronic switch flashing prevention unit；
Fig. 9 is the schematic diagram of tap inductor.
Specific embodiment
After output end LED load module open circuit, end voltage is necessarily increased, therefore can carry out by all means
Anomalous voltage samples, the voltage relationship proportional to the voltage of output port that need to only meet sampled point (can not limit direct proportion
Or inversely prroportional relationship).I.e. output voltage increases extremely, then sample amplitude when reproduced is also raised and lowered extremely, as long as meeting centainly
Changing rule and be easily achieved circuit judgement.Fig. 2 is the protection circuit of output open circuit sample point, as shown in Fig. 2, the party
Sample point one end is output head anode in the protection circuit of case, and the other end is ground terminal；Fig. 3 is the sampling of inductance auxiliary winding reverse phase
Circuit is protected, is advanced optimized to scheme shown in Fig. 2, Lp in transformer winding and Ls winding reverse phase are accessed electricity by the program
Road is set by certain turn ratio between the two；Fig. 4 is the protection circuit of inductance simplex winding inductance sampling, as shown in figure 4, the program
It protects in circuit, sample point one end is inductance side, and the other end is the inductance other side.
Vf peak levels detector is further arranged in the present invention, and the signal acquired from sample point is examined by Vf peak levels
Out after processing of circuit, with high level or low level output, excessively certain path is transmitted to the control module of switch block, Ji Keshi
Existing LED load open circuit abnormity protection function.
In the following, further illustrating power supply protection circuit of the invention, power supply circuit and illumination by several specific examples
Device.
Embodiment one
Fig. 5 shows the circuit diagram of power supply circuit involved in present embodiment.
The power supply circuit, including current rectifying and wave filtering circuit, transformer T1, switch element 4, first voltage supply circuit,
Two voltage supply circuits, the Vf peak levels detector as protection circuit, LED load module 2 and control circuit (control
Module) U1.
LED load module 2 is to obtain multiple LED series/parallel connections.When from AC power source 1 via power supply circuit
Each LED load is lighted when supplying electric power to each LED load.The LED load module is also possible to connecting multiple LED into multiple groups and connect
What the series connection connect was connected in parallel, it is being also possible to for multiple LED to be connected in parallel multiple groups and
Connection connector is connected in series.
Current rectifying and wave filtering circuit include capacitor C3 between rectification circuit DB1, the output end for being connected to rectification circuit DB1, with
And it is connected to the resistance R7 between rectification circuit DB1 and AC power source 1.As the output voltage of current rectifying and wave filtering circuit, output electricity
Voltage between the both ends of container C3.The rectification circuit DB1 can be diode and be also possible to electric bridge.
The output end of the hot side of the one end and current rectifying and wave filtering circuit of the primary coil Lp of transformer T1 connects, another
End side is connect with the drain electrode of switch element 4.Primary coil Lp is together with switch element 4 and first voltage supply circuit to LED
Power load modules.In addition, secondary coil Ls is connected with second voltage supply circuit.
Switch element 4 is made of N-channel type MOS transistor, and grid G is electrically connected with OUT terminal of control circuit U1, drain electrode
D is connect with the primary coil Lp of transformer T1, and source S is via the output of resistance R6 and the low potential side of current rectifying and wave filtering circuit
End is connected.Resistance R6 be used for switch element 4 in an ON state when the electric current for flowing through switch element 4 is limited.
Voltage between the both ends of primary coil Lp is supplied to by first voltage supply circuit via output terminal TL1, TL2
LED load module.The first voltage supply circuit has the diode D2 and electricity being connected in series between the both ends of primary coil Lp
The electrolysis condenser C2 and resistance R5 being connected in parallel with electrolytic capacitor C2.The anode of diode D2 be connected to primary coil Lp with
Tie point between switch element 4, cathode are connected to electrolytic capacitor C2.The both ends of electrolytic capacitor C2 and output terminal TL1,
TL2 is connected.The pulsating current voltage generated between the both ends of primary coil Lp by after electrolytic capacitor being smoothed of C2 from
Output terminal TL1, TL2 output.
Second voltage supply circuit supplies the voltage induced in secondary coil Ls to power supply terminal VCC.Second electricity
Pressure supply circuit have the power supply terminal VCC and current rectifying and wave filtering circuit that are connected to control circuit U1 low potential side output end it
Between capacitor C1 and anode via the secondary coil Ls (voltage supply coil Ls) of resistance R1 and transformer T1 one end
Side connection and diode D1 that cathode is connect with the power supply terminal VCC of control circuit U1.The other end of the secondary coil Ls with
The GND terminal of control circuit U1 connects.
Vf peak levels detector is made of PNP transistor Q1, clamp element (or clamp circuit) VT and resistance R3,
For detecting the raising of voltage when LED load module is opened a way and preventing from applying the power supply terminal VCC of control circuit U1 excessive
Voltage.The emitter E of transistor Q1 is connected to diode D2, electrolytic capacitor C2, resistance R5 and LED load module
Tie point, collector C is connected through the light modulation non-essential resistance R4 of resistance R3, control circuit U1 with the GND terminal of control circuit U1
It connects, the tie point through resistance R3, R4 is connect with the DIM terminal of control circuit U1, and base stage B is connected with the cathode of clamp element VT
It connects, the anode of clamp element is connected with the GND terminal of control circuit.Resistance R8 is separately connected the VCC terminal and GND of control circuit
Terminal.In a preferred embodiment, the clamp element is Zener diode.
Control circuit U1 by change be applied to switch element 4 grid voltage come to switch element 4 carry out connect and
Disconnect control.Each component for constituting control circuit U1 can be embedded in an IC package.
The voltage status of Vf peak levels detector real-time detection first voltage supply circuit, if the voltage is no more than
The normal clamp value of clamp element VT, then the DIM terminal of control circuit U1 is in low level state, control module U1 control switch
Element 4 normally provides voltage to first voltage supply circuit, and the DIM terminal of control module U1 can normally receive DIM light modulation at this time
Signal.If the voltage is more than the normal clamp value of clamp element VT, the DIM terminal of control circuit U1 is in high level shape
State, through control circuit U1 inter-process, control switch element 4 is disconnected, so that it is defeated to output terminal TL1, TL2 to disconnect transformer T1
Out, protection function when load open circuit is realized.
Its specific work process is as follows:
When normal work (LED load normally accesses), AC power source 1 passes through current rectifying and wave filtering circuit to the first of transformer T1
Grade winding Lp powers, the secondary windings Ls of transformer T1 passes through resistance R1, diode D1 and provides operating voltage to control circuit U1,
The voltage status of Vf peak levels detector real-time detection first voltage supply circuit as protection network component, such as
Voltage described in fruit is no more than the normal clamp value of clamp element VT, does not generate the current path by clamp element VT, transistor
BE knot, the BC of Q1 is tied all in off-state, GND terminal of the DIM terminal of control circuit U1 through resistance R4 Yu control circuit U1
Connection, is in low level state, and the DIM terminal of U1 can normally receive DIM dim signal, control module U1 control switch element 4
In normal operating conditions, voltage (TL1, TL2) is normally provided to first voltage supply circuit, at this time, it is assumed that output terminal
Voltage is A volt between TL1, TL2, for example, A is about 207Vpk.
When abnormal work (there are LED open circuit errors in LED load module), due to discharge off circuit after load open circuit,
Transformer T1 moment is reversed, and output terminal TL1, TL2 voltage is caused to increase, output terminal TL1, TL2 when assuming that working normally
Between in the case that voltage is A volt, electricity Ya≤YYY%*A lies prostrate (crest voltage value between output terminal TL1, TL2 when abnormal work
For the sum of bus voltage, primary winding voltage, secondary windings reflected voltage), such as 150%*A (V) or more.According to turn ratio
The numerical value of difference, YYY% would also vary from, and when A is about 207Vpk, YYY%*A is about 308Vpk.The abnormal voltage at this time
Normal clamp value more than clamp element VT, the BE of PNP transistor Q1 tie conducting, and CE knot equally follows conducting, electric current ICEIt flows through
Resistance R3, R4 draw high the level of the DIM terminal of control circuit U1 for high level, and control circuit U1 control switch element 4 is in
Off-state, LED drive circuit realize protection function when load open circuit without output.
Embodiment two
In view of in embodiment one, clamp element VT or transistor Q1 need pressure resistance higher, easy to damage so as to cause cost increasing
Add, therefore embodiment two makes improvement on the basis of the circuit of embodiment one.
Fig. 6 shows the circuit diagram of power supply circuit involved in present embodiment.The circuit has been continued to use as before attached
Icon note.
The power supply circuit, including current rectifying and wave filtering circuit, transformer T1, switch element 4, first voltage supply circuit,
Circuit element identical with embodiment one in the supply of two voltages
Circuit, as protection circuit Vf peak levels detector, LED load module 2 and control circuit U1.
Current rectifying and wave filtering circuit include capacitor C3 between rectification circuit DB1, the output end for being connected to rectification circuit DB1, with
And it is connected to the resistance R7 between rectification circuit DB1 and AC power source 1.As the output voltage of current rectifying and wave filtering circuit, output electricity
Voltage between the both ends of container C3.
The output end of the hot side of the one end and current rectifying and wave filtering circuit of the primary coil Np of transformer T1 connects, another
End side is connect with the drain electrode of switch element 4.Primary coil Np is together with switch element 4 and the first power supply circuit to LED
Power load modules.In addition, secondary coil Ns is connected with the second power supply circuit.The primary coil Np of transformer T1 and time
Grade coil Ns is reverse phase setting, is set between the two by certain turn ratio.Thus output voltage Uout sampling is to pass through transformer
The secondary coil Ns of T1 is sampled, and the output voltage Uout direct proportionality between sampling voltage Us and output terminal TL1, TL2
It changes, Us=(Ns/Np) * Uout, wherein Ns/Np < 1.It can then can ensure that control electricity with the Ns/Np proportionate relationship of reasonable set
U1 power supply in road is normal.
Switch element 4 is made of N-channel type MOS transistor, and grid G is electrically connected with OUT terminal of control circuit U1, drain electrode
D is connect with the primary coil Np of transformer T1, and source S is via the output of resistance R6 and the low potential side of current rectifying and wave filtering circuit
End is connected.Resistance R6 be used for switch element 4 in an ON state when the electric current for flowing through switch element 4 is limited.
Voltage between the both ends of primary coil Np is supplied to by first voltage supply circuit via output terminal TL1, TL2
LED load module.The first voltage supply circuit has the diode D2 and electricity being connected in series between the both ends of primary coil Np
The electrolysis condenser C2 and resistance R5 being connected in parallel with electrolytic capacitor C2.Diode D2 be anode be connected to primary coil Lp with
Tie point between switch element 4, cathode are connected to electrolytic capacitor C2.The both ends of electrolytic capacitor C2 and output terminal TL1,
TL2 is connected.The pulsating current voltage generated between the both ends of primary coil Np by after electrolytic capacitor being smoothed of C2 from
Output terminal TL1, TL2 output.
Second voltage supply circuit supplies the voltage induced in secondary coil Ns to power supply terminal VCC.Second electricity
Pressure supply circuit have the power supply terminal VCC and current rectifying and wave filtering circuit that are connected to control circuit U1 low potential side output end it
Between capacitor C1 and anode connect and cathode and control via resistance R1 with the one end of the secondary coil Ns of transformer T1
The diode D1 of the power supply terminal VCC connection of circuit U 1.The other end of the secondary coil Ns and the GND terminal of control circuit U1
Connection.
Vf peak levels detector by PNP transistor Q1, clamp element (or clamp circuit, in a preferred embodiment,
The clamp element is Zener diode) VT and resistance R2, R3 constitute, voltage when for detecting LED load module open circuit
It increases and prevents to apply excessive voltage to the power supply terminal VCC of control circuit U1.The emitter E of transistor Q1 is connected to control
The power supply terminal VCC of circuit U 1 processed, collector C are connect through resistance R3 with the DIM terminal of control circuit U1, through resistance R3, R4 with
The GND terminal of control circuit U1 is connected, and base stage B is connected with the cathode of clamp element VT, and the anode of clamp element VT is through electricity
Resistance R2 is connected with the GND terminal of control circuit U1.
Control circuit U1 by change be applied to switch element 4 grid voltage come to switch element 4 carry out connect and
Disconnect control.Each component for constituting control circuit U1 can be embedded in an IC package.
The voltage status of Vf peak levels detector real-time detection second voltage supply circuit, if the voltage is no more than
The normal clamp value of clamp element VT, control module U1 control switch element 4 normally provide voltage to first voltage supply circuit,
The DIM terminal of control module U1 can normally receive DIM dim signal at this time.If the voltage is more than the normal of clamp element VT
The DIM terminal of clamp value, control circuit U1 is in high level state, and through control circuit U1 inter-process, control switch element 4 is disconnected
It opens, to disconnect output of the transformer T1 to TL1, TL2, realizes protection function when load open circuit.
Its specific work process is as follows:
When normal work (LED load normally accesses), AC power source 1 passes through current rectifying and wave filtering circuit to the first of transformer T1
Grade winding Np powers, the secondary windings Ns of transformer T1 passes through resistance R1, diode D1 and provides operating voltage to control circuit U1,
The voltage status of Vf peak levels detector real-time detection second voltage supply circuit as protection network component, such as
Voltage described in fruit is no more than the normal clamp value of clamp element VT, does not generate the current path by clamp element VT, transistor
BE knot, the BC of Q1 is tied all in off-state, GND terminal of the DIM terminal of control circuit U1 through resistance R4 Yu control circuit U1
Connection, the DIM terminal of control module U1 can normally receive DIM dim signal at this time.Control module U1 control switch element 4 is in
Normal operating conditions normally provides voltage Uout to first voltage supply circuit, at this time, it is assumed that first voltage supply circuit it is defeated
Voltage is H volt out.For example, H is about 207Vpk.
When abnormal work (there are LED open circuit errors in LED load module), since circuit discharge off returns after load open circuit
Road, first voltage supply circuit voltage-to-ground increase, and first voltage supply circuit voltage-to-ground is H volt when assuming that working normally
In the case where, to ground electricity Ya≤YYY%*H volt, (crest voltage value is bus electricity to first voltage supply circuit when abnormal work
The sum of pressure, primary winding voltage, secondary windings reflected voltage), such as 150%*H (V) or more, according to the difference of turn ratio,
The numerical value of YYY% would also vary from, and sampling voltage Us and Uout direct proportionality change, and Us=(Ns/Np) * Uout works as H
When being about 207Vpk, YYY%*H is about 308Vpk.Exception sampling voltage Us causes the both ends clamp element VT to be more than normal at this time
Clamp value, the BE of PNP transistor Q1 tie conducting, and CE knot equally follows conducting, electric current ICEResistance R3, R4 are flowed through by control circuit U1
The level of DIM terminal draw high as high level, control circuit U1 control switch element 4 is in an off state, to disconnect transformation
Device T1 exports the port TL1, TL2, realizes protection function when load open circuit.
Embodiment three
Fig. 7 shows the circuit diagram of power supply circuit involved in present embodiment.It is identical with embodiment one in the circuit
Circuit element has continued to use appended drawing reference as before.
The power supply circuit, including current rectifying and wave filtering circuit, electronic switch flash prevention unit 9, control circuit U1, electric current
Inspection unit 7, VCC power module 8, inductance T2, as the protection Vf peak levels detector of circuit, LED load module 2, with
And voltage supply circuit.
Current rectifying and wave filtering circuit includes 3 and of LC filter between rectification circuit DB1, the output end for being connected to rectification circuit DB1
Capacitor C3 and the resistance R7 being connected between rectification circuit DB1 and AC power source 1, the LC filter 3 and capacitor C3
It is connected in parallel.It exports after being filtered after the rectified circuit DB1 rectification of AC power source by LC filter 3 to entire power supply circuit.
Electronic switch flashing prevention unit 9 connect with the output end of LC filter 3, controlled end 5 connection inductance T2 and
The connected one end of LED load module 2.The low potential side of the electronic switch flashing prevention unit 9 and current rectifying and wave filtering circuit connects
One end ground connection connect.By selecting the resistance Rd of suitable resistance value, the electric current being supplied to needed for electronic switch works normally.Electronics
Formula switch flashing prevention unit 9 is for preventing the weak current passed through in electronic switch under off state from leading to LED load mould
The abnormal flashing of block 2.
Fig. 8 is the schematic diagram of electronic switch flashing prevention unit.It includes resistance that the electronic switch, which flashes prevention unit,
Ra, Rb, Rc, Rd and transistor Q3, Q4.The collector of the transistor Q4 is connected with resistance Rd, the transmitting of transistor Q4
Pole is grounded after being connected with the emitter of transistor Q3, resistance Rb, the base stage and the collector of resistance Rc, transistor Q3 of transistor Q4
Tie point be connected, the base stage of transistor Q3 is connected with the tie point of resistance Ra, Rb, the other end and LC of resistance Rd, Rc
Another output end of filter is connected, one end that resistance Ra connection inductance T2 is connected with LED load module 2.
Decision condition whether using the presence or absence of LED load module both end voltage as transistor Q4 switch conduction, works as electronics
When formula switch is standby, LED load module both ends low-voltage, then transistor Q3 ends, transistor Q4 conducting, resistance Rd branch and electricity
Minor switch forming circuit, avoids LED load module from the case where LED bulb flashes repeatedly occur；Electronic switch normally
Afterwards, LED load module both end voltage is established, then transistor Q3 is connected, transistor Q4 cut-off, resistance Rd branch and electronic switch
Circuit cannot be constituted, electronic type circuit and LED load constitute circuit, and electric energy is no longer consumed in Rd at this time.The one of the coil of inductance T2
End side is connect with one end of current detection unit 7, and the other end is connected with the tie point of voltage supply circuit and output terminal TL1
It connects, and end is powered by VCC power module 8 to the VCC terminal of control circuit U1 herein.The current detection unit can be used
Two resistance in parallel are realized.
8 one end of VCC power module is connected with the tie point of inductance T2 and voltage supply circuit, the other end and control module
The VCC terminal of U1 connects, and provides operating voltage in normal operation for control module U1.
Voltage supply circuit, the voltage between output end are supplied to LED load module via output terminal TL1, TL2.It should
Voltage supply circuit has electrolytic capacitor C4 and company in parallel with electrolytic capacitor C4 in output terminal TL1, TL2 parallel connection
The resistance R9 connect.The electrolytic capacitor C4, the one end resistance R9 are connect with LED load module anode, the other end and LED load mould
Block cathode connection after be grounded, inductance T2 one end generate pulsating current voltage by electrolytic capacitor being smoothed of C4 after from
Output terminal TL1, TL2 output.
Vf peak levels detector by NPN transistor Q2, clamp element (or clamp circuit, in a preferred embodiment,
The clamp element is Zener diode) VT and resistance R3 constitute, the liter of voltage when for detecting LED load module open circuit
It is high and prevent from applying excessive voltage to the power supply terminal VCC of control circuit U1.The emitter E of transistor Q2 is connected to control
The GND terminal of circuit U 1, collector C are connect with the COMP terminal of control circuit U1, and base stage B is connected with the anode of clamp element VT
It connects, the cathode of clamp element VT is connect with inductance T2 with the tie point of VCC power supply.The base stage of transistor Q2 and clamp element VT and
The tie point of resistance R3 connects, the emitter of the other end connection transistor Q2 of resistance R3, and the GND terminal with control circuit U1
Connection.
The voltage status of Vf peak levels detector real-time detection voltage supply circuit, if the voltage is no more than clamp
The normal clamp value of element VT, power supply circuit normally provides voltage under the control of current detection unit 7 and control module U1
Uout, if the voltage is more than the normal clamp value of clamp element VT, in the control of current detection unit and control module U1
System is lower to disconnect output of the inductance T2 to LED load module, realizes protection function when load open circuit.
Control circuit U1 includes an internal switch (not shown).The D terminal and current rectifying and wave filtering circuit of control circuit U1,
Electronic switch flashes prevention unit connection, and VCC terminal is connected by one end of VCC power supply and inductance, and supplies mould with voltage
Block, output voltage terminals TL1 are connected, and CS terminal connects current detection module, and is reversely grounded by sustained diode 3, work as control
After the internal switch shutdown of circuit U 1 processed, inductance T2 induced potential is reversed, which is continued as by sustained diode 3
The reverse potential provides current path, to give LED load module for power supply.
The effect of control circuit U1 is the voltage different according to COMP terminal, monitors the state of Vf peak levels detector,
Auxiliary, in the state of CS terminal, controls power supply output via internal switch with current detection unit.
Control circuit U1 controls output by controlling switching on and off for internal switch element.It can be controlled constituting
Each component of circuit U 1 processed is embedded in an IC package.
7 one end of current detection unit is connect with the end CS of control circuit U1, and the other end is connect with one end of inductance T2, and with
The GND terminal of control circuit U1 connects.Real-time detection feeds back to control circuit U1 to the supply current of LED load module.
Its specific work process is as follows:
When normal work (LED load module normally accesses), AC power source 1 passes through current rectifying and wave filtering circuit, control circuit
U1, current detection module 7, inductance T2 power to output terminal TL1, TL2, and the Vf peak levels detector as protection circuit is real
When detect voltage supply circuit voltage status, if the voltage be no more than clamp element VT normal clamp value, transistor
BE knot, the BC of Q2 is tied all in off-state, and the COMP terminal and GND terminal of control circuit U1 disconnects, thus at COMP terminal
In high level state, under the control of current detection unit and control module U1, switch element 4 is in normal operating conditions,
It is normal that output voltage Uout is provided, at this time, it is assumed that voltage is A volt between output terminal TL1, TL2.
When abnormal work (there are LED open circuit errors in LED load module), due to discharge off circuit after load open circuit,
Inductance T2 moment is reversed, and output terminal TL1, TL2 electric voltage exception is caused to increase, when assuming that working normally output terminal TL1,
In the case that voltage is A volt between TL2, electricity Ya≤YYY%*A is lied prostrate between output terminal TL1, TL2 when abnormal work, such as
150%*A (V) or more, the abnormal voltage is more than the normal clamp value of clamp element VT at this time, then the BE of transistor Q2 ties conducting,
CE knot equally follows conducting, then electric current ICEFlow directly into the ground terminal of control circuit U1, the end COMP and the end GND of control circuit U1
Son conducting, finally drags down level L for COMP terminal (internal error amplifier offset port), so that the end COMP is in low level shape
State disconnects output of the inductance T2 to LED load module under the control of current detection unit and control module U1, realizes negative
Carry protection function when open circuit.
Further, inductance T2 can be used into centre tapped mode, as shown in figure 9, by VCC power module 8 and Vf
One end of the clamp element VT of peak levels detector connects inductance T2 centre cap.
When normal work (LED load module normally accesses), AC power source 1 passes through current rectifying and wave filtering circuit, control circuit
U1, current detection module 7, inductance T2 power to output terminal TL1, TL2, and the Vf peak levels detector as protection circuit is real
When detect voltage supply circuit voltage status, if the voltage be no more than clamp element VT normal clamp value, transistor
BE knot, the BC of Q2 is tied all in off-state, and the COMP terminal and GND terminal of control circuit U1 disconnects, thus at COMP terminal
In high level state, under the control of current detection unit and control module U1, switch element 4 is in normal operating conditions,
It is normal that output voltage Uout is provided, at this time, it is assumed that voltage is A volt between output terminal TL1, TL2.
When abnormal work (there are LED open circuit errors in LED load module), due to discharge off circuit after load open circuit,
Inductance T2 moment is reversed, and output terminal TL1, TL2 electric voltage exception is caused to increase, when assuming that working normally output terminal TL1,
In the case that voltage is A volt between TL2, electricity Ya≤YYY%*A is lied prostrate between output terminal TL1, TL2 when abnormal work, such as
150%*A (V) or more, according to the difference of inductance T2 centre cap both ends turn ratio, the numerical value of YYY% be would also vary from, this
When the abnormal voltage be more than clamp element VT normal clamp value, then transistor Q2 BE tie conducting, CE knot equally follow conducting,
Then electric current ICE flows directly into the ground terminal of control circuit U1, and the end COMP of control circuit U1 is connected with GND terminal, finally will
COMP terminal (internal error amplifier offset port) drags down level L, so that the end COMP is in low level state, in current detection
Output of the inductance T2 to LED load module is disconnected under the control of unit and control module U1, realizes guarantor when load open circuit
Protect function.
Embodiment four
Embodiment according to the present invention four additionally provides a kind of lighting device, which can be used as before
Open loop protection circuit described in each embodiment, or the power supply circuit before as described in each embodiment is used to fill as the illumination
The control unit set.
In conclusion the present invention can reduce LED load in power supply circuit when LED load module contact is bad
With the impaired probability of control circuit, mitigates circuit burden, the daily maintenance of lighting device can be efficiently used for.
It will be understood by those skilled in the art that in above-mentioned each embodiment, in order to keep reader more preferably geographical
It solves the application and proposes many technical details.But even if without these technical details and based on the respective embodiments described above
Various changes and modifications can also realize each claim of the application technical solution claimed substantially.Therefore, in reality
In, can to above embodiment, various changes can be made in the form and details, without departing from spirit and model of the invention
It encloses.
Claims (20)
1. a kind of open loop protection circuit, in the power supply circuit with LED load module and switch element, feature to exist
In:
The open loop protection circuit includes the Vf peak levels of control circuit and the open loop state for detecting LED load module
Detector,
The Vf peak levels detector includes transistor (Q1), clamp element, first resistor (R3), the transistor (Q1)
Emitter is connected with LED load module, and collector is through first resistor (R3) and second resistance (R4) and control circuit
GND terminal is connected and the tie point through first resistor (R3) and second resistance (R4) and the DIM terminal of control circuit connect,
Base stage is connected with the cathode of clamp element, and the anode of clamp element is connected with the GND terminal of control circuit；
The switch element and OUT terminal of control circuit connect.
2. a kind of open loop protection circuit, in the power supply circuit with LED load module and switch element, feature to exist
In:
The open loop protection circuit includes the Vf peak levels of control circuit and the open loop state for detecting LED load module
Detector,
The Vf peak levels detector includes transistor (Q1), clamp element, first resistor (R3), the transistor (Q1)
Emitter is connected to the VCC terminal of control circuit, and collector is connect through first resistor (R3) with the DIM terminal of control circuit, and
It is connected through first resistor (R3), second resistance (R4) with the GND terminal of control circuit, base stage is connected with the cathode of clamp element
It connects, the anode of clamp element is connected with the GND terminal of control circuit；
The switch element and OUT terminal of control circuit connect.
3. open loop protection circuit as described in claim 1, it is characterised in that:
The power supply circuit further includes for the first voltage supply circuit to LED load module for power supply, the Vf peak levels
Detector detects the voltage status of first voltage supply circuit, if the voltage is not above first threshold, if control circuit
Control switch element is to first voltage supply circuit normal power supply, if the voltage is more than the first threshold, control circuit
Then control switch element disconnects, and stops powering to first voltage supply circuit,
The control circuit is applied to the voltage of the grid of switch element and switches on and off to switch element by changing
Control.
4. open loop protection circuit as claimed in claim 2, it is characterised in that:
The power supply circuit further includes controlling for the first voltage supply circuit to LED load module for power supply, and for giving
The second voltage supply circuit of the VCC terminal power supply of circuit, the Vf peak levels detector detect second voltage supply circuit
Voltage status, if the voltage is not above second threshold, control switch element is supplied to first voltage if control circuit
Circuit normal power supply, if the voltage is more than the second threshold, control switch element is disconnected if control circuit, is stopped to the
The power supply of one voltage supply circuit,
The control circuit is applied to the voltage of the grid of switch element and switches on and off to switch element by changing
Control.
5. open loop protection circuit according to any one of claims 1-4, it is characterised in that:
The power supply circuit further includes transformer, and the primary coil and secondary coil of the transformer are reversed winding.
6. open loop protection circuit as claimed in claim 3, it is characterised in that:
The transistor (Q1) is PNP transistor,
The clamp element is Zener diode,
The first threshold is the normal clamp value of the clamp element.
7. a kind of power supply circuit, characterized by comprising:
Open loop protection circuit, LED load module and switch element according to claim 1-6.
8. power supply circuit as claimed in claim 7, it is characterised in that further include:
AC power source；
Current rectifying and wave filtering circuit rectifies the alternating current supplied from the AC power source；
Transformer including primary coil and secondary coil；
First voltage supply circuit supplies the voltage between the both ends of above-mentioned primary coil to the LED load module；
Second voltage supply circuit, above-mentioned switch element in an ON state when to the VCC terminal of the control circuit supply
To the voltage induced in above-mentioned secondary coil.
9. power supply circuit as claimed in claim 8, it is characterised in that:
The current rectifying and wave filtering circuit, including rectification circuit, the first capacitor device (C3) being connected between the output end of rectification circuit, with
And it is connected to the 3rd resistor (R7) between rectification circuit (DB1) and AC power source；
The first voltage supply circuit, including the first diode (D2) being connected in series between the both ends of primary coil and second
Capacitor (C2) and the 5th resistance (R5) being connected in parallel with the second capacitor (C2), the anode of the first diode (D2)
The tie point being connected between primary coil and switch element, cathode are connected to the second capacitor (C2), the second capacitor (C2)
Both ends be connected with LED load module both ends；
The second voltage supply circuit, including being connected to the VCC terminal of control circuit and the low potential side of current rectifying and wave filtering circuit
Output end between third capacitor (C1) and anode via the one of one the 6th resistance (R1) and the secondary coil of transformer
End side connection and cathode and the VCC terminal of control circuit connection the second diode (D1), the other end of the secondary coil with
The GND terminal of control circuit connects.
10. a kind of open-circuit-protection method of the open loop protection circuit of any one of such as claim 1-6, which is characterized in that including
Following step:
Detect whether the LED load module opens a way；
When not detecting the LED load module there are when open-circuit fault, then control switch element is electric to power supply for control circuit
First voltage supply circuit normal power supply in road,
If detecting the LED load module there are when open-circuit fault, control switch element stops to power supply if control circuit
First voltage supply circuit normal power supply in circuit.
11. a kind of open loop protection circuit, for LED load module, inductance (T2), VCC power module power supply circuit in,
It is characterized by:
The open loop protection circuit includes the Vf peak levels of control circuit and the open loop state for detecting LED load module
Detector,
The Vf peak levels detector includes transistor (Q2), clamp element (VT), and the emitter of the transistor is connected to
The COMP terminal of the GND terminal of control circuit, collector and control circuit connects, and base stage is connected with the anode of clamp element,
The cathode of clamp element is connect with the tie point of inductance and VCC power module, and the inductance other end passes through VCC power module to control
The VCC terminal of circuit is powered；
The control circuit includes internal switch element.
12. open loop protection circuit as claimed in claim 11, it is characterised in that:
The power supply circuit further includes for the voltage supply circuit to LED load module for power supply, the Vf peak levels detection
Device detects the voltage status of voltage supply circuit, if the voltage is not above a first threshold, control module control is internal
Switch element is to voltage supply circuit normal power supply, if the voltage is more than the first threshold, control circuit control is internal
Switch element disconnects, and stops powering to voltage supply circuit.
13. the open loop protection circuit as described in claim 11 or 12, which is characterized in that
The open loop protection circuit further includes the current detection unit being connected between inductance and the CS terminal of control circuit, described
Control circuit detects the state of Vf peak levels detector according to the voltage of COMP terminal, in conjunction with the state of current detection unit,
Power supply output is controlled via internal switch element.
14. such as the described in any item open loop protection circuits of claim 11-13, it is characterised in that:
The power supply circuit further includes electronic switch flashing prevention unit and plastic filter circuit, the electronic switch flashing
The both ends of prevention unit are connect with the output end of plastic filter circuit respectively, the company of controlled end and inductance and LED load module
Contact is connected.
15. such as the described in any item open loop protection circuits of claim 11-14, it is characterised in that:
The transistor is NPN transistor,
The clamp element is Zener diode,
The first threshold is the normal clamp value of the clamp element；
And/or
The inductance is tap inductor, and one end of VCC power module and clamp element is connected to inductance centre cap.
16. a kind of power supply circuit, characterized by comprising:
The described in any item open loop protection circuits of 1-15 and LED load module according to claim 1.
17. power supply circuit as claimed in claim 16, which is characterized in that further include:
AC power source；
Current rectifying and wave filtering circuit rectifies the alternating current supplied from the AC power source；
Inductance, for the VCC terminal and LED load module for power supply to control circuit；
The voltage that inductance generates is supplied to the LED load module by voltage supply circuit；
And/or
Electronic switch flashes prevention unit, for preventing the abnormal flashing of LED load module.
18. power supply circuit as claimed in claim 17, it is characterised in that:
The current rectifying and wave filtering circuit, including rectification circuit, the LC filter being connected between the output end of rectification circuit and third electricity
Container (C3) and the 3rd resistor (R7) being connected between rectification circuit and AC power source, the LC filter and third electricity
Container is connected in parallel；
And/or
The voltage supply circuit, including respectively with the 4th capacitor (C4), the 5th resistance (R9) of LED load wired in parallel；
And/or
The both ends of the electronic switch flashing prevention unit connects with the output end of plastic filter circuit respectively, controlled end and
Inductance is connected with the tie point of LED load module.
19. a kind of open-circuit-protection method of the open loop protection circuit of any one of such as claim 11-16, which is characterized in that packet
Include following step:
Detect whether the LED load module opens a way；
When not detecting the LED load module there are when open-circuit fault, control module controls internal switch element to power supply
Voltage supply circuit normal power supply in circuit,
If detecting the LED load module there are when open-circuit fault, control module control internal switch element stops to confession
Voltage supply circuit normal power supply in circuit.
20. a kind of lighting device, which is characterized in that using such as the described in any item open-circuit-protection electricity of claim 1-6,11-15
Road, or use such as control unit of the described in any item power supply circuits of claim 7-9,17-18 as the lighting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810152315.6A CN110167227B (en) | 2018-02-14 | 2018-02-14 | Open-circuit protection circuit, power supply circuit, open-circuit protection method and lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810152315.6A CN110167227B (en) | 2018-02-14 | 2018-02-14 | Open-circuit protection circuit, power supply circuit, open-circuit protection method and lighting device |
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| CN110167227A true CN110167227A (en) | 2019-08-23 |
| CN110167227B CN110167227B (en) | 2022-09-09 |
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| CN110167227B (en) | 2022-09-09 |
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