CN102651937A - Led lighting device - Google Patents
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- CN102651937A CN102651937A CN2012100444821A CN201210044482A CN102651937A CN 102651937 A CN102651937 A CN 102651937A CN 2012100444821 A CN2012100444821 A CN 2012100444821A CN 201210044482 A CN201210044482 A CN 201210044482A CN 102651937 A CN102651937 A CN 102651937A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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 invention provides an LED lighting device, which can stably light the LED without using an electrolytic capacitor as a smoothing capacitor connected to the output end of a rectification circuit. The LED lighting device (10) comprises a rectification circuit (13) which conducts a full-wave rectification on an AC power supply, a voltage-reducing chopper circuit (14) which has a winding (Np) and a switch element (Q1) and reduces voltage of the full-wave rectification output from the rectification circuit (13), an LED module (15) connected to the output end of the voltage-reducing chopper circuit (14), and a self-excitation drive signal generating circuit (17) which has a winding (Nd) in a magnetic coupling with the winding (Np) and drives the voltage-reducing chopper circuit (14). The self-excitation drive signal generating circuit (17) has a turn-on time correcting circuit (22), which regulates the turn-on time of the switch element (Q1). When the output voltage of the voltage-reducing chopper circuit (14) is relatively high, the turn-on time is shortened, and when the output voltage is relatively low, the turn-on time is prolonged.
Description
Technical field
The present invention relates to the LED lamp device as light source, relate in particular to the improvement that makes the stable LED lamp device of lighting of LED lamp with LED (light-emitting diode).
Background technology
In the last few years, few and long such reason of life-span based on power consumption used the lighting device of LED to obtain usually extensively popularizing.Because LED is the DC driven element, therefore smoothly commercial ac power source has been carried out the pulsating current voltage source after the full-wave rectification through smmothing capacitor usually, will drive (referring to patent documentation 1,2) as power supply from the direct voltage of level and smooth capacitor.This moment, smmothing capacitor used jumbo electrolytic capacitor mostly.
In addition, though can rely on the magnitude of current to control the brightness of LED element, the magnitude of current of direct current may not easily correctly be controlled.Therefore, preferably the method for employing is, to the LED element HF switch pulse is provided, and controls the brightness of its duty ratio with control LED element.
[patent documentation 1] japanese kokai publication hei 10-321914 communique
[patent documentation 2] TOHKEMY 2009-302017 communique
The LED element is the high parts of heat generation, yet because electrolytic capacitor is thermo-labile, so the long-time use under the high temperature can cause the characteristic variation, has the problem of lifetime.As stated, although one of speciality of LED element be exactly the life-span long, yet if short, can't bring into play LED element speciality originally as the life-span of the electrolytic capacitor of one of parts of driving LED element.Therefore hope that led drive circuit does not use electrolytic capacitor, obtain long useful life with the LED element.
Under the situation of other capacitors that use existing non-polarized capacitor, can't guarantee the electric capacity that enough pulsating current of full-wave rectification ripple carried out rectification, can only guarantee the high fdrequency component that switch causes is carried out the electric capacity of level and smooth degree.Therefore the input terminal to led drive circuit applies the full-wave rectification ripple.Since the full-wave rectification ripple weekly the phase all can fall near the 0V, therefore can't during near the lowest point the 0V, work.Thereby need be beyond during the lowest point during stable as far as possible LED electric current is provided, the brightness constancy during need making LED light.
Summary of the invention
The present invention accomplishes in order to solve above-mentioned problem; The object of the present invention is to provide a kind of can be under the situation of the smmothing capacitor that needn't use the electrolytic capacitor conduct to be connected with the output of rectification circuit, the LED lamp device that LED is stably lighted.
In order to solve above-mentioned problem, LED lamp device of the present invention is characterised in that to have: rectification circuit, and it carries out rectification to AC power; Chopper circuit, it has the 1st winding and switch element, to carrying out transformation from the rectified waveform of above-mentioned rectification circuit output; The LED element, it is connected with the output of above-mentioned chopper circuit; And autoexcitation formula drive signal generation circuit; It has and magnetic-coupled the 2nd winding of above-mentioned the 1st winding; Above-mentioned chopper circuit is driven, and above-mentioned autoexcitation formula drive signal generation circuit has the ON time correcting circuit, and this ON time correcting circuit is stipulated the ON time of above-mentioned switch element; And be controlled to be that above-mentioned ON time shortens when the output voltage of above-mentioned rectification circuit is relatively large, relatively hour above-mentioned ON time is elongated when above-mentioned output voltage.
According to the present invention, can make the current level in the LED ON time become stable.Therefore can be under the situation of not using electrolytic capacitor as smmothing capacitor, the brightness constancy during making LED light can make LED stably light.
Preferred above-mentioned ON time correcting circuit has: capacitor; The 1st resistance circuit, it has the 1st resistance; And the 2nd resistance circuit; It has the series circuit of the 2nd resistance and the 1st Zener diode; One end of above-mentioned the 1st resistance circuit and the 2nd resistance circuit all is connected with above-mentioned capacitor; Above-mentioned the 1st Zener diode has the 1st Zener voltage, and when input voltage during less than above-mentioned the 1st Zener voltage, input current flows to above-mentioned capacitor after through above-mentioned the 1st resistance circuit; When above-mentioned input voltage when above-mentioned the 1st Zener voltage is above, above-mentioned input current flows to above-mentioned capacitor after through above-mentioned the 1st resistance circuit and above-mentioned the 2nd resistance circuit both sides.According to this formation, can realize the ON time correcting circuit through simple formation.
More preferably above-mentioned ON time correcting circuit has the 3rd resistance circuit; The 3rd resistance circuit has the series circuit of the 3rd resistance and the 2nd Zener diode; One end of above-mentioned the 3rd resistance circuit all is connected with above-mentioned capacitor with above-mentioned the 1st resistance circuit and the 2nd resistance circuit; Above-mentioned the 2nd Zener diode has 2nd Zener voltage higher than above-mentioned the 1st Zener voltage; When above-mentioned input voltage during more than or equal to above-mentioned the 1st Zener voltage and less than the 2nd Zener voltage; Above-mentioned input current flows to above-mentioned capacitor after through above-mentioned the 1st resistance circuit and above-mentioned the 2nd resistance circuit both sides, and when above-mentioned input voltage during more than or equal to above-mentioned the 2nd Zener voltage, above-mentioned input current flows to above-mentioned capacitor through above-mentioned the 1st resistance circuit to the 3 resistance circuits after all.Constitute according to this, can further improve the correction accuracy of ON time correcting circuit.
LED lamp device of the present invention preferably also has the zero crossing halt circuit, this zero crossing halt circuit the rectified waveform from the output of above-mentioned rectification circuit be lower than the predetermined threshold value level during, the action of above-mentioned chopper circuit is stopped.Do not using jumbo smmothing capacitor that the rectified wave of coming self-rectifying circuit is carried out under the level and smooth situation, the rectified wave that pulsating current is bigger can be imported into chopper circuit, and the chopper circuit random action causes the luminous of LED to become unstable.Yet the action through forcibly making chopper circuit stops, and can make the brightness constancy during LED lights.
LED lamp device of the present invention preferably also has open loop protection circuit, when this open loop protection circuit becomes open circuit at the above-mentioned output of above-mentioned chopper circuit, the action of above-mentioned chopper circuit is stopped.When making that owing to the breakage of LED element the output of chopper circuit becomes open circuit; The voltage between terminals of chopper circuit can rise; Element and circuit in the LED lamp device may sustain damage, yet can prevent this damage being provided with under the situation of open loop protection circuit.
The preferred above-mentioned autoexcitation formula drive signal generation circuit of LED lamp device of the present invention also has the amplitude limiter of peak value of the output voltage of above-mentioned the 2nd winding of restriction, and the output voltage of above-mentioned the 2nd winding is provided for above-mentioned switch element after via above-mentioned amplitude limiter.Through amplitude limiter the output voltage of the 2nd winding has been carried out it being offered switch element, thereby guaranteeing the gate withstand voltage of switch element after the restriction, can also improve the voltage of the 2nd winding as far as possible, can make that thus chopper circuit moves for a long time.
According to the present invention, can provide a kind of can be under the situation of not using electrolytic capacitor as smmothing capacitor, the LED lamp device that LED is stably lighted.
Description of drawings
Fig. 1 is the block diagram of formation of the LED lamp device of expression preferred implementation of the present invention.
Fig. 2 is the circuit diagram of LED lamp device shown in Figure 1.
Fig. 3 is the action specification figure of buck chopper device circuit 14, (a) action of the state of expression switch element Q1 conducting, (b) action of expression switch element Q1 cut-off state.
Fig. 4 is used to explain the formation of ON time correcting circuit 22 and the circuit diagram of action.
Fig. 5 is the chart of expression based on voltage between terminals/current waveform of the capacitor C5 of simulation, (a) expression current waveform, (b) expression voltage waveform.
Fig. 6 is that expression is based on the mains voltage waveform of the rectification circuit of simulation and the chart of LED current waveform; Mains voltage waveform when (a) the ON time correcting circuit is not used in expression; LED current waveform when (b) the ON time correcting circuit is not used in expression; Mains voltage waveform when (c) the ON time correcting circuit is used in expression, the LED current waveform when (d) the ON time correcting circuit is used in expression.
Fig. 7 is that expression is based on the mains voltage waveform of the rectification circuit of side circuit and the chart of LED current waveform; Mains voltage waveform when (a) the ON time correcting circuit is not used in expression; LED current waveform when (b) the ON time correcting circuit is not used in expression; Mains voltage waveform when (c) the ON time correcting circuit is used in expression, the LED current waveform when (d) the ON time correcting circuit is used in expression.
Fig. 8 is the circuit diagram of the formation of expression zero crossing halt circuit.
Fig. 9 is the input/output signal oscillogram of zero crossing halt circuit.
Figure 10 is the circuit diagram of the formation of expression open loop protection circuit.
Symbol description
The 10LED lamp device; 11 source power supplies; 12 filter circuits; 13 rectification circuits; 14 buck chopper device circuit; 15 modules; 16 circuit overcurrent protections; 17 autoexcitation formula drive signal generation circuits; 18 zero crossing halt circuits; 19 open loop protection circuits; 20 amplitude limiters; 21 gate driver circuits; 22 ON time correcting circuits; 23 stop pulses produce circuit; C1～C9 capacitor; D1～D9 diode; DZ1～DZ7 Zener diode; The L1 inductance; Nd, Np winding; Q1 voltage-controlled type switch element; Q2～Q7 transistor; R1～R15 resistance; The Rst starting resistance; The T1 transformer
Embodiment
With reference to the accompanying drawings, specify preferred implementation of the present invention.
Fig. 1 is the block diagram of formation of the LED lamp device of expression preferred implementation of the present invention.Fig. 2 is the circuit diagram of LED lamp device shown in Figure 1.
As shown in Figure 1, LED lamp device 10 has filter circuit 12, rectification circuit 13, buck chopper device circuit 14, led module 15, circuit overcurrent protection 16, autoexcitation formula drive signal generation circuit 17, zero crossing halt circuit 18, the open loop protection circuit 19 of the high-frequency noise of removal source power supply (AC100V, 50/60Hz) 11.
Buck chopper device circuit 14 has voltage-controlled type switch element Q1, winding Np, sustained diode 2, capacitor C3.The switch element Q1 of this execution mode is N type MOSFET.Winding Np, sustained diode 2 and capacitor C3 constitute loop, are connecting the end of capacitor C3 at the end of winding Np, are connecting the negative electrode of diode D2 at the other end of capacitor C3, are connecting the other end of winding Np at the anode of diode D2.
In addition, via the positive side lead-out terminal that diode D1 is connecting rectification circuit 13, connecting the drain electrode of switch element Q1 at the end of winding Np at the other end of winding Np.The source electrode of switch element Q1 is connected with the minus side lead-out terminal (ground connection) of rectification circuit 13 via the current sense resistor R2 of circuit overcurrent protection 16.
The two ends of capacitor C3 constitute pair of output of buck chopper device circuit 14, on this lead-out terminal, are connecting the led module 15 that the series circuit by the LED element constitutes.The cathode side of led module 15 is connected with the end of capacitor C3, and anode-side is connected with the other end of capacitor C3.
Fig. 3 is the action specification figure of buck chopper device circuit 14, (a) action of the state of expression switch element Q1 conducting, (b) action of expression switch element Q1 cut-off state.
Shown in Fig. 3 (a), mobile in the loop that constitutes by winding Np and switch element Q1 from the electric current of power supply VCC (rectification circuit 13) when switch element Q1 conducting, in winding Np, accumulate magnetization energy.
And shown in Fig. 3 (b), when switch element Q1 ended, the magnetization energy of winding Np was provided for led module 15, and therefore led module also can be lighted when switch element Q1 ends.And in capacitor C3, accumulate electrostatic energy at this moment.
As switch element Q1 once more during conducting; Shown in Fig. 3 (a); Electric current from power supply VCC flows in the loop that is made up of winding Np and switch element Q1 once more, and the electrostatic energy of capacitor C3 discharges through led module 15, and therefore led module 15 also can be lighted when switch element Q1 conducting.
Therefore in the buck chopper device circuit 14 of this execution mode, only magnetization energy is provided for led module 15, only the peak value of exciting current is limited get final product with the cycle, is prone to the realization constant current and moves.In addition, therefore this buck chopper device circuit 14 needs core volume to a certain degree, yet only needs the ON time of limit switch element Q1 to get final product automatically with critical conduction mode action, is easy to carry out the control of the brightness of led module 15.
As depicted in figs. 1 and 2, on buck chopper device circuit 14, connecting starting resistance Rst.Starting resistance Rst is arranged between the grid of positive side lead-out terminal and switch element Q1 of rectification circuit 13.And then, between the minus side lead-out terminal of the grid of switch element Q1 and rectification circuit 13, be provided with resistance R 3.Starting resistance Rst applies the voltage of rectification circuit 13 sides to the grid of switch element Q1, gives the forward bias that switch element Q1 can move, and therefore can make switch element Q1 conducting.
Circuit overcurrent protection 16 is the circuit that when the electric current of the switch element Q1 that flows through buck chopper device circuit 14 is excessive, this switch element Q1 ended, and has transistor Q2 and current sense resistor R2.The collector electrode of transistor Q2 is connected with the grid of switch element Q1, and the emitter of transistor Q2 is connected with the source electrode (the minus side lead-out terminal of rectification circuit 13) of switch element Q1.When predetermined peak current flows through current sense resistor R2, transistor Q2 conducting, short circuit between the gate/source of switch element Q1, switch element Q1 conducting.Therefore can prevent the overcurrent of buck chopper device circuit 14.
Autoexcitation formula drive signal generation circuit 17 has inductance (driving winding) Nd, amplitude limiter 20, gate driver circuit 21, ON time correcting circuit 22, the winding Np magnetic coupling of winding Nd and buck chopper device circuit 14.That is, winding Np and winding Nd constitute winding and the secondary winding of transformer T1 respectively.When switch element Q1 conducting, electric current flows through the winding Np of buck chopper device circuit 14, in winding Nd, also produces induced voltage.
When because overcurrent makes the transistor Q2 conducting of circuit overcurrent protection 16, during short circuit, forward bias disappears, so switch element Q1 ends between the gate/source of switch element Q1.When switch element Q1 ends, shown in Fig. 3 (b), to emit owing to back electromotive force is accumulated the magnetization energy in winding Np, discharging current flows through led module 15.
At this moment, the polarity of the voltage between terminals of winding Nd is reversed, so the grid voltage of switch element Q1 is ended by extraction immediately.This polarity inversion will last till that winding Np finishes till the emitting of magnetization energy, and capacitor C4 is recharged during this period.After winding Np finishes emitting of magnetization energy, can give forward bias to the grid of switch element Q1 from the electrostatic energy that capacitor C4 emits, so switch element Q1 becomes conducting state rapidly.After this repeat foregoing circuit action, so led module is lighted all the time through charging current and discharging current.
When switch element Q1 conducting, and flow through induced current among the winding Nd of winding Np electromagnetic coupled, this electric current charges to the capacitor C5 of ON time correcting circuit 22.When capacitor C5 is recharged and makes that its voltage between terminals has surpassed the base voltage of transistor Q4, transistor Q4 conducting, short circuit between the gate/source of switch element Q1, switch element Q1 ends.
ON time correcting circuit 22 is described below.
Fig. 4 is used to explain the formation of ON time correcting circuit 22 and the circuit diagram of action.
The 1st resistance circuit that as shown in Figure 4, ON time correcting circuit 22 has transistor Q4, be connected in capacitor C5 between the base/emitter of transistor Q4, be made up of resistance R 6, by Zener diode DZ2 and the 2nd resistance R 7 be connected in series the 2nd resistance circuit that constitutes, by Zener diode DZ3 and resistance R 8 be connected in series the 3rd resistance circuit that constitutes, with capacitor C5 parallel resistor R9.One end of the 1st～the 3rd resistance circuit all is connected with the end of winding Nd, and the other end of the 1st to the 3rd resistance circuit all is connected with the end of capacitor C5.The other end of capacitor C5 is connected with the minus side lead-out terminal of rectification circuit 13.
In addition, between the base/emitter of transistor Q4, be inserted with the diode D6 as excess voltage protection, the series circuit of D7.And then the base stage of transistor Q4 is connected with the end of capacitor C5.
Same with the transistor Q2 of circuit overcurrent protection 16, the collector electrode of transistor Q4 is connected with the grid of switch element Q1, and the emitter of transistor Q4 is connected with the source electrode (the minus side lead-out terminal of rectification circuit 13) of switch element Q1.So when transistor Q4 conducting, short circuit between the gate/source of switch element Q1, switch element Q1 ends.
In this execution mode, set Zener diode DZ2 conducting when 10V of the 2nd resistance circuit for, Zener diode DZ3 conducting when 20V of the 3rd resistance circuit.Therefore when the voltage between terminals of winding Nd was in the scope of 0～10V, electric current can not flow through the 2nd and the 3rd resistance circuit, and electric current only flows through the 1st resistance circuit.Therefore the electric current that is input to capacitor C5 is merely the electric current I through R6
R6, capacitor C5 is by slowly charging.
When the voltage between terminals of winding Nd was in the scope of 10～20V, electric current can not flow through the 3rd resistance circuit, and electric current only flows through the 1st and the 2nd resistance circuit.Therefore, the electric current that is input to capacitor C5 is I
R6+ I
R7, the magnitude of current is many during than 0～10V, and capacitor C5 is by charging rapidly.
When the voltage between terminals of winding Nd was in the scope of 20～30V, electric current all flow through in the 1st～the 3rd resistance circuit.Therefore the electric current that is input to capacitor C5 is I
R6+ I
R7+ I
R8, the magnitude of current is more during than 10～20V, and capacitor C5 is by charging more rapidly.
As above, the charging rate of capacitor C5 is slower when the voltage between terminals of winding Nd is hanged down, and the charging rate of capacitor C5 is very fast when the voltage between terminals of winding Nd is higher, so switch element Q1 moves as follows.
That is, when the voltage between terminals of winding Nd was higher, capacitor C5 was by charging rapidly, and its result makes transistor Q4 conducting immediately, and switch element Q1 ends immediately.Thereby the ON time of switch element Q1 is shorter, tails off for the supplying electric current of led module 15.
And when the voltage between terminals of winding Nd was hanged down, capacitor C5 was slowly charged, its transistor Q4 more just conducting as a result, and switch element Q1 more just ends.Thereby the ON time of switch element Q1 is elongated, and is many for the supplying electric current change of led module 15.
Fig. 5 is the chart of expression based on voltage between terminals/current waveform of the capacitor C5 of simulation, (a) expression current waveform, (b) expression voltage waveform.
Like Fig. 5 (a) with (b), when switch element Q1 conducting, positive current flows through capacitor C5, makes capacitor C5 be recharged thus, and the voltage between terminals of inner capacitor C5 uprises gradually between charge period.And when the voltage between terminals of capacitor C5 reaches 0.65V, transistor Q4 conducting, switch element Q1 ends.Be reversed to discharge condition and become the moment that the ends container C 5 that electrifies, discharge according to the time constants of confirming by resistance R 9 from switch element Q1.
As above, the magnitude of current that offers led module 15 is proofreaied and correct to less when the voltage between terminals of winding Nd is higher, more when voltage between terminals is low, therefore can obtain current waveform smooth between high period.
Fig. 6 is mains voltage waveform and the chart of LED current waveform of expression based on the rectification circuit of simulation, (a) with (b) expression be the situation of not using the ON time correcting circuit, (c) with the situation of (d) representing that is to use the ON time correcting circuit.In addition, (a) with (c) expression mains voltage waveform, (b) with (d) expression LED current waveform.
Like Fig. 6 (a) with (b),, become for the supplying electric current of led module 15 and to rise and descend more blunt waveform under the situation of not using the ON time correcting circuit, promptly only under the 1st resistance circuit (only resistance R 6) and the situation that capacitor C5 is connected.Relative therewith; Like Fig. 6 (c) with (d); When use has been appended the 2nd resistance circuit that is made up of resistance R 7 and Zener diode DZ2 and during the ON time correcting circuit of the 3rd resistance circuit that is made up of resistance R 8 and Zener diode DZ3, become waveform smooth between high period.
Fig. 7 is the mains voltage waveform and the chart of LED current waveform of expression based on the rectification circuit of side circuit, (a) with (b) expression be the situation of not using the ON time correcting circuit, (c) with the situation of (d) representing that is to use the ON time correcting circuit.In addition, (a) with (c) expression mains voltage waveform, (b) with (d) expression LED current waveform.
Shown in Fig. 7 (a)～(d), can know in side circuit, also can obtain and simulate identical result.That is, like Fig. 7 (a) with (b), under the situation of not using the ON time correcting circuit; Supplying electric current for led module 15 becomes rising and the more blunt waveform that descends; And, under the situation of using the ON time correcting circuit, become waveform smooth between high period like Fig. 7 (c) with (d).
Zero crossing halt circuit 18 then is described.
Fig. 8 is the circuit diagram of the formation of expression zero crossing halt circuit 18.
As shown in Figure 8, zero crossing halt circuit 18 is forcibly to make the circuit that stops from the oscillation action of the zero crossing vicinity of the current waveform in full-wave rectifier of rectification circuit 13 output.Because the luminosity of LED is unstable when buck chopper device circuit 14 random actions, thereby stops through the action that forcibly makes buck chopper device circuit 14, can prevent the instability of LED brightness.
Zero crossing halt circuit 18 has transistor Q5, be connected in the parallel circuits of capacitor C6 and resistance R 10 between the base/emitter of transistor Q5, the stop pulse that generates stop pulse produces circuit 23.
Same with the transistor Q2 of circuit overcurrent protection 16, the collector electrode of transistor Q5 is connected with the grid of switch element Q1, and the emitter of transistor Q5 is connected with the source electrode (the minus side lead-out terminal of rectification circuit 13) of switch element Q1.So when transistor Q5 conducting, short circuit between the gate/source of switch element Q1, switch element Q1 ends.
Stop pulse produces the current waveform in full-wave rectifier that circuit 23 is kept watch on rectification circuit 13, when current waveform in full-wave rectifier produces stop pulse when predetermined threshold value voltage is following.When capacitor C6 was recharged, transistor Q5 conducting made between the gate/source of switch element Q1 short circuit and its action is stopped.After the supply of stop pulse finished, capacitor C6 was discharged through resistance R 10, and transistor Q5 ends.
The series circuit that resistance R 11, diode D8 and the resistance R 14 that the stop pulse of this execution mode produces circuit 23 and has a pair of PNP transistor Q6 that constitutes differential amplifier circuit, Q7, is connected by the emitter with transistor Q6, Q7 constitutes, the capacitor C7 that is connected with the emitter of transistor Q6, Q7 via resistance R 14.The end of capacitor C7 is connected via the emitter of resistance R 14 with transistor Q6, Q7, and the other end is connected with the minus side lead-out terminal of rectification circuit 13.
In addition, stop pulse produces circuit 23 and has Zener diode DZ4 between the base stage/collector electrode that is connected in transistor Q6, is connected in resistance R 15 between the base/emitter of transistor Q6, the parallel circuits of resistance R 13, capacitor C8 and Zener diode DZ5 between the collector electrode of the resistance R 12, the base stage that is connected in transistor Q7 and the transistor Q6 that are connected with the base stage of transistor Q7.The collector electrode of transistor Q7 is connected with the base stage of transistor Q5, and the output signal of transistor Q7 is provided for transistor Q5 as stop pulse.
The voltage between terminals of winding Nd is provided for the emitter of transistor Q6, Q7 via resistance R 11, diode D8 and resistance R 14.On the other hand, the output voltage of rectification circuit 13 is provided for the base stage of transistor Q7 after by resistance R 12 and R13 dividing potential drop.The voltage between terminals of winding Nd is 30～40V to the maximum; And because the maximum of the output voltage of rectification circuit 13 is about 140V; Therefore apply bigger reverse biased sometimes between the emitter/base to transistor Q7; Yet be merely several volts owing to the reverse bias between the emitter/base of transistor Q7 is withstand voltage, therefore the negative electrode of Zener diode DZ5 be connected to the base stage of transistor Q7, realize protection for reverse biased.
And then the voltage between terminals of winding Nd also is provided for the base stage of transistor Q6 via resistance R 11, diode D8 and resistance R 15.The base voltage of transistor Q6 is remained constant by Zener diode DZ4.The voltage between terminals of winding Nd is a current waveform in full-wave rectifier, even stop pulse generation circuit 23 also needs operating stably near its zero crossing, therefore needs to use the big as far as possible capacitor C7 of electric capacity to keep the operation voltage of transistor Q6, Q7.Capacitor C7 is recharged when switch element Q1 conducting.That is, when winding Np is applied voltage, in winding Nd, produce voltage, C7 charges to capacitor.Capacitor C7 is recharged during the winding voltage rising, during in addition, is discharged.Owing to have diode D8, so the discharging current of capacitor C7 is provided for the emitter of transistor Q6, Q7 all the time via resistance R 14.
Fig. 9 is the input/output signal oscillogram of zero crossing halt circuit 18.
As shown in Figure 9, based on the comparator of the differential amplifier circuit of transistor Q6, Q7 to by certain reference voltage of Zener diode DZ4 defined with as coming the reference voltage of the current waveform in full-wave rectifier of self-rectifying circuit 13 to compare.During reference voltage is greater than reference voltage, do not produce stop pulse, and reference voltage be lower than reference voltage during produce stop pulse, stop pulse is provided for capacitor C6, capacitor C6 is recharged.Thus, transistor Q5 conducting, switch element Q1 ends, and near the action of zero crossing is stopped.
Open loop protection circuit 19 then is described.
Figure 10 is the circuit diagram of the formation of expression open loop protection circuit 19.
Shown in figure 10; Open loop protection circuit 19 is to prevent for example to make the output of buck chopper device circuit 14 become open circuit owing at least 1 LED element in the led module 15 is damaged; The voltage between terminals of buck chopper device circuit 14 rises, the circuit that a part of element in the LED lamp device 10 sustains damage.
Open loop protection circuit 19 has capacitor C9, Zener diode DZ6, diode D9.The negative electrode of diode D9 is connected with the end of winding Nd via resistance R 11, and the anode of diode D9 is connected with the minus side lead-out terminal of rectification circuit 13 via capacitor C9.In addition, the negative electrode of Zener diode DZ6 is connected with the base stage of transistor Q7, and the anode of Zener diode DZ6 is connected with the anode of diode D9.
Use diode D9 only to take out the voltage of the minus side in the voltage between terminals of winding Nd, use capacitor C9 to carry out smoothly, via the reference voltage input of Zener diode DZ6 and comparator, be that the base stage of transistor Q7 is connected.
The output of buck chopper device circuit 14 becomes open circuit; The voltage between terminals of buck chopper device circuit 14 rises, thereby when the voltage that imposes on Zener diode DZ6 during more than or equal to Zener voltage, transistor Q7 conducting; Stop pulse is provided for capacitor C6, and capacitor C6 is recharged.Thus, transistor Q5 conducting, short circuit between the gate/source of switch element Q1, switch element Q1 ends.
The magnetization energy of winding Nd is residual in addition when the output of buck chopper device circuit 14 becomes open circuit, and more energy is filled into the capacitor C4 of gate driver circuit 21, and gate drive voltage rises.Therefore the Zener diode DZ7 that couples together between just need gate/source as chopper circuit with switch element Q1.Consume remaining magnetization energy through Zener diode DZ7, make its intermittent action, can prevent the destruction of each element.Need this threshold setting must be higher than the voltage of chopper circuit, with not conducting when moving usually.
Therefore as stated, the LED lamp device 10 of this execution mode has ON time correcting circuit 22, can make the rising and the decline of the electric current that offers LED become sharply, can also make during the zero crossing in addition during approach smooth.Therefore can be at the brightness constancy during under the situation of smmothing capacitor not being used electrolytic capacitor LED being lighted.
In addition; The LED lamp device 10 of this execution mode has the zero crossing halt circuit 18 that stops at the oscillation action that during the zero crossing of the current waveform in full-wave rectifier of rectification circuit 13 output, forcibly makes buck chopper device circuit 14, therefore can further suppress the instability of LED brightness.
And then; The LED lamp device 10 of this execution mode has becoming the open loop protection circuit 19 that the situation of open circuit detects between the lead-out terminal of buck chopper device circuit 14 because the destruction of LED etc. make; Therefore can make forcibly that switch element Q1 ends, can realize the circuit of safety.
Preferred implementation of the present invention has been described more than, and has been the invention is not restricted to above-mentioned execution mode that can in the scope that does not break away from purport of the present invention, apply various changes, these contents also all are contained among the present invention certainly.
For example in the above-described embodiment, ON time correcting circuit 22 uses the parallelly connected condition that Zener diodes switch 3 resistance to control, yet current path is not limited to 3, also can be 2 or more than 4.And do not do special qualification for changing method yet.In addition, other rectification circuits such as half-wave rectifying circuit can be used in the present invention, other transforming circuits such as boost chopper circuit can also be used.
Claims (6)
1. LED lamp device is characterized in that having:
Rectification circuit, it carries out rectification to AC power;
Chopper circuit, it has the 1st winding and switch element, to carrying out transformation from the rectified waveform of above-mentioned rectification circuit output;
The LED element, it is connected with the output of above-mentioned chopper circuit; And
Autoexcitation formula drive signal generation circuit, it has and magnetic-coupled the 2nd winding of above-mentioned the 1st winding, above-mentioned chopper circuit is driven,
Above-mentioned autoexcitation formula drive signal generation circuit has the ON time correcting circuit; This ON time correcting circuit is stipulated the ON time of above-mentioned switch element; And be controlled to be that above-mentioned ON time shortens when the output voltage of above-mentioned rectification circuit is relatively large, relatively hour above-mentioned ON time is elongated when above-mentioned output voltage.
2. LED lamp device according to claim 1 is characterized in that, above-mentioned ON time correcting circuit has:
Capacitor;
The 1st resistance circuit, it has the 1st resistance; And
The 2nd resistance circuit, it has the series circuit of the 2nd resistance and the 1st Zener diode,
One end of above-mentioned the 1st resistance circuit and the 2nd resistance circuit all is connected with above-mentioned capacitor,
Above-mentioned the 1st Zener diode has the 1st Zener voltage,
When input voltage during less than above-mentioned the 1st Zener voltage, input current flows to above-mentioned capacitor after through above-mentioned the 1st resistance circuit,
When above-mentioned input voltage when above-mentioned the 1st Zener voltage is above, above-mentioned input current flows to above-mentioned capacitor after through above-mentioned the 1st resistance circuit and above-mentioned the 2nd resistance circuit both sides.
3. LED lamp device according to claim 2 is characterized in that,
Above-mentioned ON time correcting circuit has the 3rd resistance circuit, and the 3rd resistance circuit has the series circuit of the 3rd resistance and the 2nd Zener diode,
One end of above-mentioned the 3rd resistance circuit all is connected with above-mentioned capacitor with above-mentioned the 1st resistance circuit and the 2nd resistance circuit,
Above-mentioned the 2nd Zener diode has 2nd Zener voltage higher than above-mentioned the 1st Zener voltage,
When above-mentioned input voltage during more than or equal to above-mentioned the 1st Zener voltage and less than the 2nd Zener voltage, above-mentioned input current flows to above-mentioned capacitor after through above-mentioned the 1st resistance circuit and above-mentioned the 2nd resistance circuit both sides,
When above-mentioned input voltage during more than or equal to above-mentioned the 2nd Zener voltage, above-mentioned input current flows to above-mentioned capacitor through above-mentioned the 1st resistance circuit to the 3 resistance circuits after all.
4. LED lamp device according to claim 1; It is characterized in that; Said LED lamp device also has the zero crossing halt circuit; This zero crossing halt circuit the rectified waveform from the output of above-mentioned rectification circuit be lower than the predetermined threshold value level during, the action of above-mentioned chopper circuit is stopped.
5. LED lamp device according to claim 1; It is characterized in that; Said LED lamp device also has open loop protection circuit, when this open loop protection circuit becomes open circuit at the above-mentioned output of above-mentioned chopper circuit, the action of above-mentioned chopper circuit is stopped.
6. according to each described LED lamp device in the claim 1 to 5; It is characterized in that; Above-mentioned autoexcitation formula drive signal generation circuit also has the amplitude limiter of peak value of the output voltage of above-mentioned the 2nd winding of restriction, and the output voltage of above-mentioned the 2nd winding is provided for above-mentioned switch element after via above-mentioned amplitude limiter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011042916A JP5327251B2 (en) | 2011-02-28 | 2011-02-28 | LED lighting device |
| JP2011-042916 | 2011-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102651937A true CN102651937A (en) | 2012-08-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100444821A Pending CN102651937A (en) | 2011-02-28 | 2012-02-23 | Led lighting device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5327251B2 (en) |
| KR (1) | KR101333687B1 (en) |
| CN (1) | CN102651937A (en) |
| TW (1) | TW201242422A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103025021A (en) * | 2012-12-14 | 2013-04-03 | 西安铨芯电子有限公司 | Step-down light emitting diode (LED) drive circuit based on electrical inductance discharge time modulation |
| CN103906311A (en) * | 2012-12-27 | 2014-07-02 | 日立空调·家用电器株式会社 | Lighting device |
| CN103997194A (en) * | 2014-04-21 | 2014-08-20 | 杰华特微电子（杭州）有限公司 | Method for driving switch tube in BUCK circuit |
| CN113597820A (en) * | 2019-03-12 | 2021-11-02 | Lg伊诺特有限公司 | Light source driving device |
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| JP6131511B2 (en) * | 2012-10-10 | 2017-05-24 | パナソニックＩｐマネジメント株式会社 | Lighting device and lighting apparatus using the same |
| KR102132666B1 (en) * | 2012-10-26 | 2020-07-13 | 서울반도체 주식회사 | Device for driving light emitting diode |
| JP6226276B2 (en) * | 2014-03-28 | 2017-11-08 | パナソニックＩｐマネジメント株式会社 | LED power supply |
| KR102133612B1 (en) * | 2015-03-30 | 2020-08-05 | 매그나칩 반도체 유한회사 | Trigger circuit and light apparatus comprising the same |
| JP6928878B2 (en) * | 2018-01-30 | 2021-09-01 | パナソニックＩｐマネジメント株式会社 | Lighting device |
| CN110167227B (en) * | 2018-02-14 | 2022-09-09 | 松下知识产权经营株式会社 | Open-circuit protection circuit, power supply circuit, open-circuit protection method and lighting device |
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| CN103997194B (en) * | 2014-04-21 | 2017-07-07 | 杰华特微电子（杭州）有限公司 | A kind of driving method of BUCK circuits breaker in middle pipe |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101333687B1 (en) | 2013-11-27 |
| JP2012182231A (en) | 2012-09-20 |
| JP5327251B2 (en) | 2013-10-30 |
| KR20120098443A (en) | 2012-09-05 |
| TW201242422A (en) | 2012-10-16 |
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Application publication date: 20120829 |