CN101720154A - Emergency power supply switching circuit and LED drive circuit thereof - Google Patents
Emergency power supply switching circuit and LED drive circuit thereof Download PDFInfo
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- CN101720154A CN101720154A CN200910188934A CN200910188934A CN101720154A CN 101720154 A CN101720154 A CN 101720154A CN 200910188934 A CN200910188934 A CN 200910188934A CN 200910188934 A CN200910188934 A CN 200910188934A CN 101720154 A CN101720154 A CN 101720154A
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention relates to an emergency power supply switching circuit which comprises a direct current input circuit, an alternating current input circuit and a signal switching circuit, wherein the input end of the direct current input circuit is connected with a direct current power supply and used for receiving direct current power supply input signals; the input end of the alternating current input circuit is connected with an alternating current power supply and used for receiving alternating current power supply input signals; and the signal switching circuit is connected between the direct current input circuit and the alternating current input circuit to realize the automatic switching of the direct current power supply input signals and the alternating current power supply input signals. The invention also correspondingly provides an LED drive circuit with an emergency power supply switching function. The LED drive circuit uses the alternating current power supply as a preferred power supply, uses the direct current power supply as a spare power supply, and realizes the switching function of the alternating current power supply and the direct current power supply, and enables an ordinary LED lamp to have the capability of emergency lighting.
Description
Technical field
The present invention relates to a kind of led drive circuit, more particularly, relate to a kind of emergency power supply switching circuit and adopt the led drive circuit of this emergency power supply switching circuit.
Background technology
At present, LED is powered by AC power in the ordinary course of things.Therefore, corresponding led drive circuit also is primarily aimed at AC power and drives.In some cases, LED also can power by DC power supply, and then corresponding led drive circuit also is only applicable to DC power supply and drives.
Yet at some special occasions, on the naval vessel, the LED light fixture need change by emergent power supply and power, to satisfy the requirement of emergency lighting when AC power break down.Because emergency power supply is generally DC source, and the general led drive circuit that is driven by AC power is not suitable for DC power supply, therefore, presses for the automatic switchover that a kind of drive circuit that has the emergency power supply handoff functionality is realized power of alterating and direct current.
Summary of the invention
The technical problem to be solved in the present invention is, at the above-mentioned defective that does not have the power of alterating and direct current automatic switching function of existing led drive circuit, a kind of emergency power supply switching circuit is provided and adopts the led drive circuit of this emergency power supply switching circuit.
The technical solution adopted for the present invention to solve the technical problems is: adopt direct-flow input circuit, ac input circuit to receive DC power supply input signal and AC power input signal respectively, realize the automatic switchover of power of alterating and direct current by signal switching circuit, with DC power supply input signal or AC power input signal input Drive and Control Circuit, thereby driving LED is luminous.
The invention provides a kind of emergency power supply switching circuit, comprising:
Direct-flow input circuit, input links to each other with DC power supply, is used to receive the DC power supply input signal;
Ac input circuit, input links to each other with AC power, is used to receive the AC power input signal;
Signal switching circuit, be connected between described direct-flow input circuit and the described ac input circuit, described signal switching circuit turn-offs the output of direct-flow input circuit when ac input circuit receives the AC power input signal, the AC power input signal that makes ac input circuit comes driving LED work as the output of emergency power supply switching circuit; Described signal switching circuit is opened the output of direct-flow input circuit when ac input circuit does not receive the AC power input signal, the DC power supply input signal that makes direct-flow input circuit comes driving LED work as the output of emergency power supply switching circuit.
In emergency power supply switching circuit of the present invention, described signal switching circuit comprises first diode, the anode of described first diode links to each other with the output of described direct-flow input circuit, the negative electrode of described first diode links to each other with the output of described ac input circuit, to guarantee the priority of AC power input signal.
In emergency power supply switching circuit of the present invention, described direct-flow input circuit comprises first power factor correction circuit, described first power factor correction circuit comprises first chip, the voltage and current Phase synchronization of the duty ratio control output of the PWM ripple by regulating first chip output.
In emergency power supply switching circuit of the present invention, described ac input circuit comprises second power factor correction circuit; Described second power factor correction circuit comprises second chip, the voltage and current Phase synchronization of the duty ratio control output of the PWM ripple by regulating second chip output, the magnitude of voltage of the AC power input signal after second power factor correction circuit is proofreaied and correct is greater than the magnitude of voltage of described direct voltage input signal.
In emergency power supply switching circuit of the present invention, described signal switching circuit also comprises first triode, the base stage of described first triode links to each other with the power end of second chip of described second power factor correction circuit by first resistance, be connected with second resistance between the base stage of described first triode and the emitter, the collector electrode of described first triode links to each other with the power end of first chip of described first power factor correction circuit by the 3rd resistance.
In emergency power supply switching circuit of the present invention, described direct-flow input circuit also comprises first filter circuit and first full bridge rectifier that is connected between the described DC power supply and first power factor correction circuit.
In emergency power supply switching circuit of the present invention, described ac input circuit also comprises second filter circuit and second full bridge rectifier that is connected between the described AC power and second power factor correction circuit.
In emergency power supply switching circuit of the present invention, described direct-flow input circuit is provided with first fuse, and described ac input circuit is provided with second fuse.
The present invention also provides a kind of led drive circuit with the emergency power supply handoff functionality, comprise above-mentioned emergency power supply switching circuit, and the Drive and Control Circuit that links to each other with the output of described emergency power supply switching circuit, be used to receive DC power supply input signal or AC power input signal with driving LED work.
In the led drive circuit of band emergency power supply handoff functionality of the present invention, described Drive and Control Circuit comprises overvoltage crowbar.
Implement emergency power supply switching circuit of the present invention and led drive circuit thereof, have following beneficial effect: the present invention can be with AC power as preferred power supply, DC power supply has realized the handoff functionality of power of alterating and direct current as stand-by power supply, makes the common LED light fixture possess the ability of emergency lighting.In addition, the present invention adopts power factor correction circuit, has improved the scope of input voltage greatly, therefore is applicable to high-power LED light source.Led drive circuit of the present invention has constant current and over-voltage over-current protection function simultaneously, has improved the overall performance of light fixture.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the module diagram of the led drive circuit embodiment of band emergency power supply handoff functionality of the present invention;
Fig. 2 is the circuit theory diagrams of direct-flow input circuit embodiment in the led drive circuit of band emergency power supply handoff functionality of the present invention;
Fig. 3 is the circuit theory diagrams of ac input circuit embodiment in the led drive circuit of band emergency power supply handoff functionality of the present invention;
Fig. 4 is the circuit theory diagrams of signal switching circuit embodiment in the led drive circuit of band emergency power supply handoff functionality of the present invention;
Fig. 5 is the circuit theory diagrams of Drive and Control Circuit embodiment in the led drive circuit of band emergency power supply handoff functionality of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
See also Fig. 1, be the module diagram of the led drive circuit embodiment of band emergency power supply handoff functionality of the present invention.As shown in Figure 1, the led drive circuit of band emergency power supply handoff functionality provided by the invention adopts emergency power supply switching circuit.This emergency power supply switching circuit comprises direct-flow input circuit 100, ac input circuit 200 and signal switching circuit 300.
The input of direct-flow input circuit 100 links to each other with DC power supply 100 ', is used to receive the DC power supply input signal; The input of ac input circuit 200 links to each other with AC power 200 ', is used to receive the AC power input signal.
Signal switching circuit 300 is connected between described direct-flow input circuit 100 and the described ac input circuit 200.Described signal switching circuit 300 turn-offs the output of direct-flow input circuit 100 when ac input circuit 200 receives the AC power input signal, the AC power input signal that makes ac input circuit 200 comes driving LED work as the output of emergency power supply switching circuit; Described signal switching circuit 300 is opened the output of direct-flow input circuit 100 when ac input circuit 200 does not receive the AC power input signal, the DC power supply input signal that makes direct-flow input circuit 100 comes driving LED work as the output of emergency power supply switching circuit.
The led drive circuit of band emergency power supply handoff functionality provided by the invention also comprises Drive and Control Circuit 400.Drive and Control Circuit 400 links to each other with the output of described emergency power supply switching circuit, the output that is direct-flow input circuit 100 and ac input circuit 200 is connected to Drive and Control Circuit 400, for Drive and Control Circuit 400 provides DC power supply input signal or AC power input signal.Drive and Control Circuit 400 receives this DC power supply input signal or AC power input signal rear drive LED500 work.
See also Fig. 2 to Fig. 5, be the circuit theory diagrams of the led drive circuit embodiment of band emergency power supply handoff functionality of the present invention.Respectively the composition and the circuit theory of each module is described below:
1, direct-flow input circuit 100
Fig. 2 is the circuit theory diagrams of direct-flow input circuit embodiment in the led drive circuit of band emergency power supply handoff functionality of the present invention; As shown in Figure 2, described direct-flow input circuit 100 comprises first filter circuit, first full bridge rectifier and first power factor correction circuit that connects successively.
The input of direct-flow input circuit 100 links to each other with DC power supply 100 ', and is provided with the first fuse F2, to prevent that input current is excessive circuit is caused damage.Described first filter circuit comprises capacitor C Y6, capacitor C Y7, coupling inductance L8 and capacitor C 52.The first input end of described direct-flow input circuit 100 is by capacitor C Y6 ground connection, and second input of described direct-flow input circuit 100 is by capacitor C Y7 ground connection.The first input end of described direct-flow input circuit 100 connects first end of first winding of coupling inductance L8, first end of second winding of the second input termination coupling inductance L8 of described direct-flow input circuit 100 is connected with capacitor C 52 between second end of first winding of coupling inductance L8 and second end of second winding.
First full bridge rectifier is used for the rectification to direct-flow input signal.It comprises the rectifier bridge heap of being made up of diode D22, diode D23, diode D24 and diode D25.The anode of described diode D22 links to each other with second end of first winding of described coupling inductance L8, and the anode of described diode D24 links to each other with second end of second winding of described coupling inductance L8.The plus earth of the anode of described diode D23 and described diode D25; The negative electrode of the negative electrode of described diode D22 and described diode D24 links to each other and passes through the output of inductance L 9 as first full bridge rectifier; The output of described first full bridge rectifier is by capacitor C 53 and C54 ground connection in parallel.
Described first power factor correction circuit comprises transformer T3, diode D30, electrochemical capacitor C63, triode Q12, the first chip U7 and field effect transistor Q13 at least;
The output of first termination, first full bridge rectifier of the former limit winding of transformer T3, the anode of the described diode D30 of second termination; Be connected with the diode D29 of forward between second end of first end of the former limit winding of transformer T3 and the former limit winding of transformer T3; The negative electrode of diode D30 is connected to the positive pole of electrochemical capacitor C63, the minus earth of electrochemical capacitor C63 by thermistor NTV2; The positive pole of electrochemical capacitor C63 meets node VOUT1 by the diode D31 of forward.
The secondary winding first end ground connection of transformer T3, second end is connected to the collector electrode of triode Q12 successively by the diode D27 of resistance R 84, capacitor C 59, forward, the anode of diode D27 is by reverse diode D28 ground connection, the negative electrode of diode D27 is by capacitor C 58 ground connection, be connected resistance R 83 between the collector electrode of triode Q12 and the base stage, the base stage of triode Q12 is by the voltage-stabiliser tube ZD10 ground connection of forward; The emitter of triode Q12 is connected to the 8th pin (VCC) of the first chip U7 by the diode D29 of forward; Be connected with resistance R 79, resistance R 80 and resistance R 81 between the output of first full bridge rectifier and the diode D29; The negative electrode of diode D29 is by the voltage-stabiliser tube ZD11 ground connection of capacitor C 62, capacitor C 61 and forward in parallel, and the negative electrode of voltage-stabiliser tube ZD11 is node K1, and meets node K2 by the diode D32 of forward.
First end of the former limit winding of transformer T3 is by resistance R 76, resistance R 77, resistance R 78 ground connection, and also there is capacitor C 55 at resistance R 78 two ends, and the node between resistance R 77 and the resistance R 78 links to each other with the 3rd pin (MU) of the first chip U7; The positive pole of electrochemical capacitor C63 is by resistance R 91, resistance R 92, resistance R 93, resistance R 94 ground connection, node between resistance R 93 and the resistance R 94 links to each other with the 1st pin (INV) of the described first chip U7, is connected with capacitor C 57 between the 1st pin (INV) of the described first chip U7 and the 2nd pin (COM); Capacitor C 56 and resistance R 82 are connected between the 1st pin (INV) and the 2nd pin (COM) of the described first chip U7; The 4th pin (CS) of the described first chip U7 is by capacitor C 60 ground connection; The 5th pin (ZCD) of the described first chip U7 is connected with secondary winding second end of described transformer T3 by resistance R 85;
The drain electrode of field effect transistor Q13 links to each other with the anode of diode D30, the source electrode of field effect transistor Q13 is by resistance R 89 ground connection, the grid of field effect transistor Q13 is connected to the 7th pin (G) of the described first chip U7 by resistance R 85, is connected with resistance R 87 between the grid of described field effect transistor Q13 and the source electrode; The source electrode of described field effect transistor Q13 is linked the 4th pin (CS) of the described first chip U7 by resistance R 88.First power factor correction circuit is by regulating the duty ratio of the PWM ripple of exporting, the ON time of control triode Q13, thereby the voltage and current Phase synchronization of control output.
2, ac input circuit 200
Fig. 3 is the circuit theory diagrams of ac input circuit embodiment in the emergency power supply switching circuit of the present invention; As shown in Figure 3, the input of ac input circuit 200 links to each other with AC power 200 ', and is provided with the second fuse F1, to prevent that input current is excessive circuit is caused damage.Described second filter circuit comprises slide rheostat VR1, resistance R 1, resistance R 2, capacitor C X1, capacitor C Y1, capacitor C Y2, coupling inductance L1, capacitor C Y3, capacitor C Y4, coupling inductance L2, capacitor C Y2, inductance L 3 and inductance L 4.Wherein, resistance R 1 and resistance R 2 are connected between the first input end and second input of ac input circuit 200; Slide rheostat VR1 is connected between the first input end and second input of described ac input circuit 200, and capacitor C X1 is connected between the first input end and second input of described ac input circuit 200.The first input end of described ac input circuit 200 is by capacitor C Y1 ground connection, and second input of described ac input circuit 200 is by capacitor C Y1 ground connection.The first input end of described ac input circuit 200 connects first end of first winding of coupling inductance L1, first end of second winding of the second input termination coupling inductance L1 of described ac input circuit 200, second end of first winding of coupling inductance L1 is by capacitor C Y3 ground connection; Second end of second winding of coupling inductance L1 is by capacitor C Y4 ground connection.Second end of first winding of coupling inductance L1 links to each other with first end of first winding of described coupling inductance L2, and second end of second winding of coupling inductance L1 links to each other with first end of second winding of described coupling inductance L2.Be connected with capacitor C Y2 between second end of second end of first winding of coupling inductance L2 and second winding of described coupling inductance L2.Second end of first winding of coupling inductance L2 is connected in first end of inductance L 3, and second end of second winding of described coupling inductance L2 is connected in first end of inductance L 4.
Second full bridge rectifier comprises the rectifier bridge heap of being made up of diode D1, diode D2, diode D3 and diode D4.The anode of described diode D1 links to each other with second end of described inductance L 3, and the anode of described diode D3 links to each other with second end of described inductance L 4.The plus earth of the anode of described diode D2 and described diode D4; The negative electrode of the negative electrode of described diode D1 and described diode D3 links to each other as the output of second full bridge rectifier; The output of described second full bridge rectifier is by capacitor C 1, capacitor C 2 and capacitor C 3 ground connection in parallel.
Described second power factor correction circuit comprises transformer T1, diode D8, electrochemical capacitor C12, electrochemical capacitor C13, triode Q1, the second chip U1 and field effect transistor Q2 at least;
The output of first termination, second full bridge rectifier of the former limit winding of transformer T1, the anode of the described diode D8 of second termination; Be connected with the diode D29 of forward between second end of first end of the former limit winding of transformer T1 and the former limit winding of transformer T1; The negative electrode of diode D8 is connected to the positive pole of electrochemical capacitor C12 and electrochemical capacitor C13, the minus earth of electrochemical capacitor C12 and electrochemical capacitor C13 by thermistor NTV2; The positive pole of electrochemical capacitor C12 meets the output of ac input circuit 200, i.e. node VOUT1 by the diode D9 of forward.
The secondary winding first end ground connection of transformer T1, second end is connected to the collector electrode of triode Q1 successively by the diode D5 of resistance R 11, capacitor C 6, forward, the anode of diode D5 is by reverse diode D6 ground connection, the negative electrode of diode D5 is by capacitor C 5 ground connection, be connected resistance R 10 between the collector electrode of triode Q1 and the base stage, the base stage of triode Q1 is by the voltage-stabiliser tube ZD1 ground connection of forward; The emitter of triode Q1 is connected to the 8th pin (VCC) of the first chip U7 by the diode D7 of forward, for it provides operating voltage; Be connected with resistance R 6, resistance R 7 and resistance R 8 between the negative electrode of the output of second full bridge rectifier and diode D7; The negative electrode of diode D7 is by the voltage-stabiliser tube ZD2 ground connection of capacitor C 9, capacitor C 11 and forward in parallel, and the negative electrode of voltage-stabiliser tube ZD2 meets node K3, and meets node K2 by diode D33.
First end of the former limit winding of transformer T1 is by resistance R 3, resistance R 4, resistance R 5 ground connection, and also there is capacitor C 4 at resistance R 5 two ends, and the node between resistance R 4 and the resistance R 5 links to each other with the 3rd pin (MU) of the second chip U1; The positive pole of electrochemical capacitor C12 is by resistance R 17, resistance R 18, resistance R 19, resistance R 20 ground connection, node between resistance R 19 and the resistance R 20 links to each other with the 1st pin (INV) of the described second chip U1, is connected with capacitor C 8 between the 1st pin (INV) of the described second chip U1 and the 2nd pin (COM); Capacitor C 7 and resistance R 9 are connected between the 1st pin (INV) and the 2nd pin (COM) of the described second chip U1; The 4th pin (CS) of the described second chip U1 is by capacitor C 9 ground connection; The 5th pin (ZCD) of the described second chip U1 is connected with secondary winding second end of described transformer T1 by resistance R 12;
The drain electrode of field effect transistor Q2 links to each other with the anode of diode D8, the source electrode of field effect transistor Q2 is by resistance R 16 ground connection, the grid of field effect transistor Q2 is connected to the 7th pin (G) of the described second chip U1 by resistance R 13, is connected with resistance R 14 between the grid of described field effect transistor Q2 and the source electrode; The source electrode of described field effect transistor Q2 is linked the 4th pin (CS) of the described second chip U1 by resistance R 15.Second power factor correction circuit is by regulating the duty ratio of the PWM ripple of exporting, the ON time of control triode Q2, thereby the voltage and current Phase synchronization of control output.
3, signal switching circuit 300
Fig. 4 is the circuit theory diagrams of signal switching circuit embodiment in the emergency power supply switching circuit of the present invention.As shown in Figure 4, described signal switching circuit 300 comprises the first diode D31 at least, the anode of the described first diode D31 links to each other with the output of described ac input circuit 200, the negative electrode of the described first diode D31 links to each other with the output of described ac input circuit 200, to guarantee the priority of AC power input signal.
Described signal switching circuit 300 also comprises the first triode Q14, the base stage of the described first triode Q14 is by the power end of first resistance R 96 with the second chip U1 of described second power factor correction circuit, promptly the 8th pin (VCC) links to each other, be connected with second resistance R 95 between the base stage of the described first triode Q14 and the emitter, the collector electrode of the described first triode Q14 is by the power end of the 3rd resistance R 90 with the first chip U7 of described first power factor correction circuit, and promptly the 8th pin (VCC) links to each other.
Under the normal condition, ac power supply, the second chip U1 is working properly, the then first triode Q14 conducting, therefore the operating voltage of the second chip U7 is changed to electronegative potential, is lower than 0.5V, so the first factor correcting circuit can not worked.Because the first diode D31 anode connects direct current system output, negative electrode connects AC system output, the anode voltage of the first diode D31 is about 310V so at this moment, and negative electrode is about 300V, so this moment, priority was for exchanging, entire circuit is standby with regard to relying on interchange that the energy, direct current are provided like this.
In particular cases, when AC power stops input, then the first triode Q14 closes, the operating voltage of the second chip U7 is about 17V so, the first factor correcting circuit operate as normal, this moment, the first diode D31 anode voltage was about about 380V, was higher than cathode voltage, so this moment, direct current system provided the energy.When AC power restores electricity, the first triode Q14 conducting, AC power is to follow-up drive circuitry.
4, Drive and Control Circuit 400
Fig. 5 is the circuit theory diagrams of Drive and Control Circuit embodiment in the emergency power supply switching circuit of the present invention; As shown in Figure 5, Drive and Control Circuit 400 comprises control section, drive part, feedback fraction and overvoltage protection part;
Control section comprises control chip U2 and field effect transistor Q8, Q9, resistance R 44, R46, R43, R45, R40, R38, diode D14, D13.The output head anode of optocoupler U3 is by divider resistance R40; R38 connects the 4th pin (RF) of control chip U2; the 15th pin (HVG) of control chip U2 connects the grid of field effect transistor Q8 by resistance R 43; the drain electrode of field effect transistor Q8 connects the output of ac input circuit 200; be node VOUT1; its source electrode connects the drain electrode of field effect transistor Q9; the grid of field effect transistor Q9 connects the 11st pin (LVG) of control chip U2 by resistance R 45; its source ground; the anode of diode D14 connects the grid of field effect transistor Q8; its negative electrode connects the 15th pin of control chip; diode D14 is used for the short-circuit protection of field effect transistor Q8; similarly; diode D13 is connected between the grid and control chip U2 the 11st pin of field effect transistor Q9; resistance R 44 is connected between the grid and source electrode of field effect transistor Q8; resistance R 46 is connected between the grid and source electrode of field effect transistor Q9, and the 14th pin (OUT) of control chip U2 connects the source electrode of field effect transistor Q8.
Control chip U2 exports the pulse-width signal of corresponding duty ratio according to the control signal of the feedback loop of the 4th pin (RF) input.For example, voltage or the electric current of LED are too high, the output head anode of optocoupler U3 is a low level, control chip U2 reduces the duty ratio of output voltage according to the low level signal of the 4th pin (RF), promptly adjusts the alternate conduction time of field effect transistor Q8, Q9, reaches the purpose of adjusting output voltage, be specially, when the 15th pin (HVG) of control chip U2 is high level, field effect transistor Q8 conducting, the voltage of its 14th pin (OUT) output is high level; When the 11st pin (LVG) of control chip U2 is high level, field effect transistor Q9 conducting, the voltage of its 14th pin (OUT) output is low level, and the ON time that control chip U2 alternately exports high level by its 15th pin (HVG) of control and the 11st pin (LVG) reaches the purpose of exporting different voltages.
Control section also comprises the restriction stabilized voltage power supply, voltage stabilizing didoe ZD3, ZD4, ZD5 connect successively, wherein, the negative electrode of voltage stabilizing didoe ZD3 connects the output of ac input circuit 200, the anode of voltage stabilizing didoe ZD5 connects the collector electrode of triode Q6, the base stage of triode Q6 connects the negative electrode of voltage stabilizing didoe ZD6, and its emitter connects the anode of voltage stabilizing didoe ZD6 by resistance R 24, is connected after resistance R 22, the R23 series connection between the base stage of the anode of voltage stabilizing didoe ZD6 and triode Q4.The base stage of triode Q3 is by resistance R 25 ground connection, the base stage of its collector connecting transistor Q6, its grounded emitter.The anode of diode D10 connects the anode of voltage stabilizing didoe ZD6, its negative electrode connects the negative electrode of diode D12, the anode of diode D12 connects the emitter of triode Q10, the base stage of triode Q10 connects the negative electrode of voltage stabilizing didoe ZD7, its collector electrode connects the negative electrode of diode D11, the plus earth of voltage stabilizing didoe ZD7, the anode of diode D11 connects drive part by resistance R 28, resistance R 27 is connected between the collector electrode and base stage of triode Q10, and capacitor C 16 is connected between the negative electrode of the anode of voltage stabilizing didoe ZD7 and diode D11.Resistance R 26 is connected between the emitter of the base stage of triode Q3 and triode Q10.The output head anode of optocoupler U4 connects the negative electrode of voltage stabilizing didoe ZD11 in the direct-flow input circuit 100 by reverse diode D22, be node K2, after capacitor C 31 and resistance R 50 parallel connections, the output head anode of one termination optocoupler U4 and the emitter of triode Q7, the base stage of another termination triode Q7, the base stage of triode Q7 connects the collector electrode of triode Q6 by resistance R 49, the grounded emitter of triode Q6, its base stage is by capacitor C 32 and resistance R 51 ground connection in parallel, the negative pole of output end of optocoupler U4 is by the resistance R 52 of two series connection, R53 connects the base stage of triode Q6, the collector electrode connecting resistance R52 of triode Q7, the anode of node between the R53 and diode D17, the negative electrode of diode D17 connects the base stage of triode Q3 by resistance R 54, the base stage of triode Q6 connects the base stage of triode Q5, the grounded emitter of triode Q5, the resistance R 29 of its collector electrode by connecting successively, R30, R31 connects the negative electrode of voltage stabilizing didoe ZD3, the collector electrode of triode Q5 connects the 7th pin (LIN) of control chip U2 by resistance R 33, and resistance R 32 is connected between the emitter and collector of triode Q12.
During the work of restriction stabilized voltage power supply, triode Q7 ends, the anode voltage of diode 17 is high, triode Q3 conducting, triode Q4 conducting, the input voltage triode Q10 that behind voltage stabilizing didoe ZD3, ZD4, the ZD5 of series connection, flows through, triode Q10 is operated in saturation condition, and the direct voltage of its collector electrode output provides operating voltage for feedback fraction after the secondary winding step-down of transformer T2.
Drive part comprises transformer T2, diode D19, D20, capacitor C 34, C37, C38, inductance L 5, L6, resistance R 55, R56, R57, the interface J3, the J4 that connect LED, transformer T2 is a two winding transformer, and the two ends of its former limit main winding are the 14th pin (OUT) and the induction by current part of control chip U2 respectively, and the two ends of its former limit time winding connect restriction stabilized voltage power supply and ground respectively; The anode of diode D19 connects an end of the secondary main winding of transformer T2, and the anode of diode D20 connects the other end of the secondary main winding of transformer T2, and the negative electrode of diode D19 and D20 is connected.Interface J3 is by the inductance L 5 of two series connection, the negative electrode that L6 connects diode D19; Interface J4 connects the earth terminal of the secondary main winding of transformer T2 by sample resistance R57.Capacitor C 34 is connected between the negative electrode and interface J4 of diode D19, and capacitor C 37 is connected between the node and interface J4 between inductance L 5 and the inductance L 6, and capacitor C 38 is connected between interface J3, the J4, and resistance R 55 and resistance R 56 are connected in parallel on capacitor C 37 two ends respectively.The pwm voltage signal of control section output is through the main winding step-down of transformer T2, then by becoming direct current behind diode D19, the D20, inductance L 5, L6, capacitor C 34, C37, C38 are used for filtering, dc powered LED behind rectifying and wave-filtering work, resistance R 59 be used to the to take a sample electric current of LED.
In feedback fraction; amplifier U5 is a double operational; be respectively applied for the voltage and current of feedback LED; the 8th pin of amplifier U5 connects power supply (Vcc); its the 4th pin ground connection; its the 2nd pin is by divider resistance R60; R61 connects the anodal (not shown) of drive part LED; promptly meet J3; its the 6th pin accesses node (not shown) between sample resistance R 57 and the LED by resistance R 63; promptly meet J4; power supply (Vcc) is by resistance R 65; R66; R67 ground connection; resistance R 65; node between the R66 connects the 3rd pin of amplifier U5; resistance R 66; node between the R67 connects the 5th pin of amplifier U5; power supply (Vcc) provides reference voltage for amplifier U5; capacitor C 46 is parallel to resistance R 72; the two ends of R73; capacitor C 47 is parallel to the two ends of resistance R 73; capacitor C 46; C47 is used for the short-circuit protection of amplifier U5 reference voltage; the sampling end of voltage-reference U6 is connected resistance R 66 with control end; node between the R67; its earth terminal ground connection; resistance R 68; capacitor C 45 series connection backs are in parallel with capacitor C 43; be connected between the 1st pin and the 2nd pin of amplifier U5; be used for the phase compensation of LED voltage sampling signal; in like manner; resistance R 69; capacitor C 46 series connection backs are connected with capacitor C 44; be connected between amplifier the 6th pin and the 7th pin; be used for the phase compensation of LED current sampling signal; the 1st pin of amplifier U5 connects the negative electrode of diode D21; the anode of diode D21 connects the input cathode of optocoupler U3; in like manner; the 7th pin of amplifier U5 connects the negative electrode of diode D20, and the anode of diode D20 connects the input cathode of optocoupler U3, and the input anode of optocoupler U3 connects power supply (Vcc) by resistance R 70; its negative pole of output end ground connection, its output head anode connects control section.
When circuit working, if the overtension of LED, the 1st pin output low level of amplifier U5, optocoupler U3 conducting, its output head anode output low level; When the electric current of LED too high, the 7th pin output low level of amplifier U5, optocoupler U3 conducting, its output head anode output low level.That is, if when the voltage of LED or electric current have at least one too high, optocoupler U3 conducting is to the control section output low level.
Feedback fraction also comprises linear stabilized power supply, linear stabilized power supply comprises diode D18, voltage stabilizing didoe ZD9, triode Q11, resistance R 75, R59, capacitor C 40, the emitter of triode Q11 is by capacitor C 40 ground connection, one end of resistance R 62 connects the negative electrode of voltage-stabiliser tube ZD9 and the base stage of triode Q11, the collector electrode of its another termination triode Q11, the plus earth of voltage stabilizing didoe ZD9, capacitor C 40 is connected in parallel on the two ends of resistance R 59 and voltage stabilizing didoe ZD9, the collector electrode of triode Q11 is by the negative pole of resistance R 75 connection diode D18, and the positive pole of diode D18 connects an end of transformer T2 secondary time winding, the other end ground connection of transformer T2 secondary time winding.The emitter output voltage of triode Q11 is equivalent to power supply (Vcc).Voltage step-down behind the secondary winding of transformer T2 of the restriction stabilized voltage power supply output in the control section 100 is exported galvanic current again after linear voltage stabilizing, this direct current provides working power for feedback fraction.
Drive and Control Circuit 400 also comprises overvoltage crowbar, and described overvoltage crowbar comprises resistance R 73, R74, R70, R71, R72, capacitor C 49, optocoupler U4, voltage-reference U6.Resistance R 72, capacitor C 49 backs in parallel one end ground connection, the other end meets J3 by resistance R 71, R72, the input anode of optocoupler U4 connects the emitter of triode Q11 by resistance R 73, its input cathode connects the control end of voltage-reference U6, the earth terminal ground connection of voltage-reference U6, node between its sampling terminating resistor R71 and resistance R 72, resistance R 79 are connected between the input cathode of the emitter of triode Q11 and optocoupler U4.
When the overtension of LED, the voltage increases of divider resistance R71, the sampling terminal voltage of voltage-reference U6 increases, the voltage of its control end reduces, optocoupler U4 conducting, and the voltage of the base stage of triode Q6 is low level, triode Q5 ends, the 7th pin (LIN) of control chip is a high level, and control chip U2 turn-offs, and stops the power supply of LED.On the other hand, optocoupler U4 conducting, the voltage of the source electrode of triode Q11 reduces, and triode Q3 ends, and triode Q4 ends, the restriction stabilized voltage power supply is turn-offed, thereby feedback fraction quits work, to sum up, and when the overtension of LED, control section, drive part and feedback fraction all are turned off, and quit work.
As preferred power supply, DC power supply has realized the handoff functionality of power of alterating and direct current as stand-by power supply to led drive circuit of the present invention with AC power, makes the common LED light fixture possess the ability of emergency lighting.In addition, the present invention adopts power factor correction circuit, has improved the scope of input voltage greatly, therefore is applicable to high-power LED light source.Led drive circuit of the present invention has constant current and over-voltage over-current protection function simultaneously, has improved the overall performance of light fixture.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the technology of the present invention, can carry out many modifications and not break away from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (10)
1. an emergency power supply switching circuit is characterized in that, comprising:
Direct-flow input circuit (100), input links to each other with DC power supply (100 '), is used to receive the DC power supply input signal;
Ac input circuit (200), input links to each other with AC power (200 '), is used to receive the AC power input signal;
Signal switching circuit (300), be connected between described direct-flow input circuit (100) and the described ac input circuit (200), described signal switching circuit (300) turn-offs the output of direct-flow input circuit (100) when ac input circuit (200) receives the AC power input signal, the AC power input signal that makes ac input circuit (200) comes driving LED work as the output of emergency power supply switching circuit; Described signal switching circuit (300) is opened the output of direct-flow input circuit (100) when ac input circuit (200) does not receive the AC power input signal, the DC power supply input signal that makes direct-flow input circuit (100) comes driving LED work as the output of emergency power supply switching circuit.
2. emergency power supply switching circuit according to claim 1, it is characterized in that, described signal switching circuit (300) comprises first diode (D31), the anode of described first diode (D31) links to each other with the output of described direct-flow input circuit (100), the negative electrode of described first diode (D31) links to each other with the output of described ac input circuit (200), to guarantee the priority of AC power input signal.
3. emergency power supply switching circuit according to claim 2, it is characterized in that, described direct-flow input circuit (100) comprises first power factor correction circuit, described first power factor correction circuit comprises first chip (U7), the voltage and current Phase synchronization of the duty ratio control output of the PWM ripple by regulating first chip (U7) output.
4. emergency power supply switching circuit according to claim 3 is characterized in that, described ac input circuit (200) comprises second power factor correction circuit; Described second power factor correction circuit comprises second chip (U1), the voltage and current Phase synchronization of the duty ratio control output of the PWM ripple by regulating second chip (U1) output, the magnitude of voltage of the AC power input signal after described second power factor correction circuit is proofreaied and correct is greater than the magnitude of voltage of described direct voltage input signal.
5. emergency power supply switching circuit according to claim 4, it is characterized in that, described signal switching circuit (300) also comprises first triode (Q14), the base stage of described first triode (Q14) links to each other with the power end (VCC) of second chip (U1) of described second power factor correction circuit by first resistance (R96), be connected with second resistance (R95) between the base stage of described first triode (Q14) and the emitter, the collector electrode of described first triode (Q14) links to each other with the power end (VCC) of first chip (U7) of described first power factor correction circuit by the 3rd resistance (R90).
6. emergency power supply switching circuit according to claim 3, it is characterized in that described direct-flow input circuit (100) also comprises first filter circuit and first full bridge rectifier that is connected between the described DC power supply (100 ') and first power factor correction circuit.
7. emergency power supply switching circuit according to claim 4, it is characterized in that described ac input circuit (200) also comprises second filter circuit and second full bridge rectifier that is connected between the described AC power (200 ') and second power factor correction circuit.
8. according to claim 6 or 7 described emergency power supply switching circuits, it is characterized in that described direct-flow input circuit (100) is provided with first fuse (F2), described ac input circuit (200) is provided with second fuse (F1).
9. led drive circuit with the emergency power supply handoff functionality, it is characterized in that, comprise any described emergency power supply switching circuit in the claim 1 to 8, and the Drive and Control Circuit (400) that links to each other with the output of described emergency power supply switching circuit, be used to receive DC power supply input signal or AC power input signal and work with driving LED (500).
10. the led drive circuit of band emergency power supply handoff functionality according to claim 9 is characterized in that, described Drive and Control Circuit (400) comprises overvoltage crowbar.
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| CN200910188934A CN101720154A (en) | 2009-12-15 | 2009-12-15 | Emergency power supply switching circuit and LED drive circuit thereof |
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| CN200910188934A CN101720154A (en) | 2009-12-15 | 2009-12-15 | Emergency power supply switching circuit and LED drive circuit thereof |
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| CN102612197A (en) * | 2011-01-20 | 2012-07-25 | 海洋王照明科技股份有限公司 | LED (light emitting diode) driving circuit and LED lamp using same |
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| CN103313482A (en) * | 2013-06-24 | 2013-09-18 | 杭州徕科光电有限公司 | Light-emitting diode (LED) emergency lighting system and LED lighting lamp |
| CN105027681B (en) * | 2013-11-05 | 2017-09-12 | 梅洛实验室株式会社 | AC LED driver circuit |
| CN105027681A (en) * | 2013-11-05 | 2015-11-04 | 梅洛实验室株式会社 | Alternating current led drive circuit |
| CN104320896A (en) * | 2014-11-23 | 2015-01-28 | 向红 | Uninterruptible power supply floodlight circuit and floodlight |
| CN104467167A (en) * | 2014-12-26 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Power source path management circuit |
| CN104467167B (en) * | 2014-12-26 | 2016-10-05 | 青岛歌尔声学科技有限公司 | A kind of power path management circuit |
| CN110366286A (en) * | 2018-04-09 | 2019-10-22 | 海洋王（东莞）照明科技有限公司 | Double drive circuit and LED light driving device |
| CN110366286B (en) * | 2018-04-09 | 2021-11-02 | 深圳市海洋王绿色照明技术有限公司 | Double-driving circuit and LED lamp driving device |
| CN109067152A (en) * | 2018-07-13 | 2018-12-21 | 苏州华兴源创科技股份有限公司 | A kind of power supply circuit for the detection of OLED mould group |
| CN109586399A (en) * | 2018-12-14 | 2019-04-05 | 重庆华渝电气集团有限公司 | A kind of warship zero conversion time power supply system of inertial navigation set multichannel |
| CN109587890A (en) * | 2018-12-29 | 2019-04-05 | 浙江阳光城市照明工程有限公司 | A kind of drive circuit of LED light |
| CN109587890B (en) * | 2018-12-29 | 2024-03-05 | 浙江阳光城市照明工程有限公司 | Driver circuit of LED lamp |
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Application publication date: 20100602 |