CN103582250A - LED lighting on device - Google Patents
LED lighting on device Download PDFInfo
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- CN103582250A CN103582250A CN201310329742.4A CN201310329742A CN103582250A CN 103582250 A CN103582250 A CN 103582250A CN 201310329742 A CN201310329742 A CN 201310329742A CN 103582250 A CN103582250 A CN 103582250A
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Abstract
The present invention provides an LED lighting on device, which is small-sized and high-efficient and is capable of preventing flicker and reducing an impact current in the case of being connected to a light modulator. The LED lighting on device has: a rectifying circuit for changing an AC voltage into a rectified voltage; a first capacitor for changing the rectified voltage into a DC link voltage; a DC-DC conversion circuit for converting the DC link voltage to supply power to an LED load; a current setting circuit for outputting a current set value of the DC-DC conversion circuit based on the rectified voltage; a shunt circuit connected between DC output terminals of the rectifying circuit and having at least one series body if a resistor and a switching element; and a switching circuit for controlling the switching element in the series body, wherein, the switching circuit connects the switching element in the at least one series body in the series bodies during the period of the rectified voltage lower than a desired reference voltage and during the period from the moment when the rectified voltage is higher than the desired reference voltage to the moment when desired time has passed.
Description
Technical field
The present invention relates to the ignition device of light-emitting diode (being denoted as below LED:Light Emitting Diode).
Background technology
LED receives publicity as the outstanding light source of environment, and LED throws light on and utilized as the illumination of house or office.In LED illumination, exist and possess the lamp holder same with incandescent lamp, be arranged on the lamp shape LED illumination utilizing on the utensil that incandescent lamp uses.Wherein, also there is the product corresponding to dimmer (being designated hereinafter simply as dimmer) of the phase control mode using with light modulation unit as incandescent lamp.Most of dimmers will carry out conducting/cut-out by the on/off of semiconductor element between AC power and load.As the semiconductor element of dimmer, utilize three terminal bidirectional switch (TRIAC:Triode Alternating Current Switch, 3 terminal bidirectional thyristors) etc.Below, semiconductor element is denoted as to three terminal bidirectional switch, but can is also the semiconductor element of other kind.
Three terminal bidirectional switch is being connected (scratch start) if rear not Continuous-flow is crossed the large electric current of predetermined current value that keeps electric current than being called as, and again disconnects (extinguishing arc).Keep electric current according to the kind of dimmer (three terminal bidirectional switch) and difference, but roughly there is the amplitude of 5～50mA.Most of dimmers be take load and are designed as incandescent lamp as prerequisite.If load is incandescent lamp, from three terminal bidirectional switch connection time be carved near moment zero passage of AC supply voltage (being sometimes denoted as below Vac) and flow through and surpass the enough electric currents that keep electric current, three terminal bidirectional switch keeping on-state, near moment zero passage, three terminal bidirectional switch disconnects.
But in the situation that load is LED and ignition device thereof, the situation that is incandescent lamp with load is compared consumed power, and even electric current is little, therefore, can occur near the phenomenon that the zero passage that welcomes AC power, three terminal bidirectional switch disconnects before.Below, this phenomenon is denoted as to mistake extinguishing arc.Particularly randomly or burst occur under the situation of mistake extinguishing arc, or exist under the situation of fluctuation in the moment of mistake extinguishing arc, the action of LED ignition device becomes unstable, and flickering occurs.
LED ignition device as preventing from missing extinguishing arc, preventing flickering, for example, have the device of recording in patent documentation 1.In the device of recording, utilize the concatermer of damping resistance and switch element in patent documentation 1, only in the scheduled period from three terminal bidirectional switch connection, the noise of damping resistance and dimmer is prevented to circuit is connected in parallel.Thus, in the connection of three terminal bidirectional switch, by noise, prevent that circuit from braking the resonance action occurring, prevent electric current violent oscillatory motion and become less than the maintenance electric current of three terminal bidirectional switch.Can prevent the mistake extinguishing arc of three terminal bidirectional switch and the flickering causing thus.
In the device of recording, do not consider the reduction of impulse current in patent documentation 1.In the situation that take the power circuit of electric capacity input mode as following, form LED ignition device as basis, in the connection of three terminal bidirectional switch, the voltage of capacitor sharply increases, and therefore produces the impulse current of the charging of following capacitor.The corresponding bulb-shaped LED illumination of existing most dimmer, possesses impulse current in order to reduce this impulse current and prevents resistance (being designated hereinafter simply as surge resistance).But the maximization of the device that the lift-launch of surge resistance causes and loss increase becomes problem.In addition, even if possess surge resistance, still exist impulse current large, the possibility that the maximization of capacitor, surge resistance, input filter parts etc. and loss increase.About this impulse current, in the project of execution mode below, describe, therefore here description thereof is omitted.In addition, in the device of recording, need new composed of external damping resistance in patent documentation 1, for controlling, whether damping resistance and noise are prevented to switch element that circuit is connected and the control circuit of control switch element, consider the problem of device maximization.
Patent documentation 1: TOHKEMY 2012-023001 communique
Summary of the invention
In the present invention, object is to realize and in the situation that having connected dimmer, can prevents flickering, reduction impulse current and small-sized, high efficiency LED lamp device.
In order to reach above-mentioned purpose, a kind of LED ignition device is provided in the present invention, possess: the rectification circuit that is commutating voltage by AC voltage conversion; Via the 1st diode, be connected with the direct current outlet side of described rectification circuit, described commutating voltage be transformed to the 1st capacitor of DC link voltage; Convert described DC link voltage and carry out the DC-DC translation circuit to LED load supplying; Based on described commutating voltage, export the current setting circuit of the current setting value of described DC-DC translation circuit; Be connected between DC output end of described rectification circuit, possess the shunt circuit of the concatermer of at least one resistance and switch element; Control the commutation circuit of the switch element in described concatermer, wherein, described commutation circuit, described commutating voltage lower than the reference voltage of wishing during and be carved into while becoming higher than described reference voltage from described commutating voltage through moment of time of hope during, the switch element at least one concatermer in described concatermer is connected.
According to LED ignition device of the present invention, can realize and in the situation that having connected dimmer, can prevent flickering, reduce impulse current and small-sized, high efficiency LED lamp device.
Accompanying drawing explanation
Fig. 1 is the basic block diagram of the LED ignition device in the 1st execution mode of the present invention.
Fig. 2 is the internal circuit diagram of dimmer.
Fig. 3 is the action waveforms having used as the load of dimmer in the situation of incandescent lamp.
Fig. 4 means the action waveforms of the existing problem about impulse current.
Fig. 5 is shunt circuit in the 1st execution mode of the present invention and the structure example of commutation circuit.
Fig. 6 is the action waveforms in the 1st execution mode of the present invention.
Fig. 7 is other examples of shunt circuit.
Fig. 8 is other examples of commutation circuit.
Fig. 9 is other examples of shunt circuit and commutation circuit.
Figure 10 is other examples of commutation circuit.
Figure 11 is other examples of the action waveforms in the 1st execution mode of the present invention.
Figure 12 is other examples of shunt circuit and commutation circuit.
Figure 13 is other examples of the action waveforms in the 1st execution mode of the present invention.
Figure 14 is the basic block diagram of the LED ignition device in the 2nd execution mode of the present invention.
Figure 15 is shunt circuit in the 2nd execution mode of the present invention and the structure example of commutation circuit.
Figure 16 is the action waveforms in the 2nd execution mode of the present invention.
Figure 17 is other examples of the basic block diagram of the LED ignition device in the 2nd execution mode of the present invention.
Figure 18 is rectification circuit in LED ignition device of the present invention and the structure example of DC-DC translation circuit.
Symbol description
1LED ignition device
100 AC power
101 dimmers
102 rectification circuits
103 diodes (124 is also identical)
104 capacitors (113,125,146,151 is also identical)
105DC-DC translation circuit
106LED load
107 shunt circuits
108 commutation circuits
109 current setting circuits
110 three terminal bidirectional switches
111 resistance (119,120,123,126,129,132,136,138,147,150 is also identical)
112 variable resistors
114 bidirectional trigger diodes
115 incandescent lamp even loads
116 pre-process circuits
117 comparison circuits (133,139 is also identical)
118 trailing edge delay circuits
121 comparators (134,140,152 is also identical)
122 voltage sources (135,141,153 is also identical)
127MOSFET(131,137,144 is also identical)
128 voltage regulator circuits
130 Zener diodes
142 diode bridges
145 choking-windings
148 control circuits
149 delay circuits
Embodiment
Below, use accompanying drawing explanation embodiments of the present invention.
Fig. 1 is the basic block diagram of the LED ignition device 1 in the 1st execution mode of the present invention.In Fig. 1, AC power 100, dimmer 101 and LED load 106 are not comprised in LED ignition device 1.LED ignition device 1 consists of rectification circuit 102, diode 103, capacitor 104, DC-DC translation circuit 105, shunt circuit 107, commutation circuit 108 and current setting circuit 109.
One end of AC power 100 is connected with one end of dimmer 101, and the other end of dimmer 101 is connected with the rectification circuit 102 in LED ignition device 1.The other end of AC power 100 is connected with rectification circuit 102.AC power 100 generates AC supply voltage (being denoted as below Vac).102 pairs of rectification circuits have carried out the alternating voltage after phase control by dimmer 101 and have carried out rectification, generate commutating voltage (being sometimes denoted as below Vdc1).Rectification circuit 102 is connected with diode 103, shunt circuit 107, commutation circuit 108, current setting circuit 109.Diode 103 is connected with capacitor 104, DC-DC translation circuit 105.Capacitor 104 is transformed to DC link voltage (following, to be sometimes denoted as Vdc2) by commutating voltage.For example, in the situation that utilize the power circuit of electric capacity input mode, DC link voltage becomes commutating voltage is carried out to the voltage after level and smooth.By commutating voltage being carried out smoothly, for the DC-DC translation circuit 105 of rear class, easily suppress the pulsation of the electric current (being denoted as below LED electric current) that flows through in LED load 106.Backward LED load 106 power supplies of DC-DC translation circuit 105 conversion DC link voltage.About LED load 106, with the number of LED or to be connected form irrelevant, in addition, can comprise and be built-in with the LED module of element etc. for protection.
Between DC output end of rectification circuit 102, connect shunt circuit 107.Although do not represent, shunt circuit 107 possesses the concatermer of at least one resistance and switch element, can flow through the current value of shunt circuit 107 from external control, in other words, control the impedance of shunt circuit 107 in Fig. 1.Commutation circuit 108 outputs are for controlling the switching signal of the switch element of shunt circuit 107 based on commutating voltage.Shunt circuit 107 and commutation circuit 108 also play according to commutating voltage control the effect of the ON/OFF state of the three terminal bidirectional switch in dimmer 101, timer circuit that will dimmer 101 makes the effect of three terminal bidirectional switch connection after resetting again.The current setting value of current setting circuit 109 based on commutating voltage output DC-DC translation circuit 105.By current setting circuit 109, can carry out with the control of the LED electric current of the operational correspondence of dimmer 101, be light modulation.Concrete action as current setting circuit 109, comprising: generate the current setting value corresponding with the mean value of commutating voltage; Below detecting from commutating voltage, the firing angle of the dimmer 101 of explanation, generates the current setting value corresponding with firing angle.A part for above inscape can be built in to be controlled in IC, or the control program that can be used as microcomputer etc. is realized.Except above inscape, can also append coil that fuse, surge resistance, input filter use or capacitor etc.
Before the concrete action of explanation, the action of dimmer 101 is described.Fig. 2 is the internal circuit that has used the dimmer 101 of three terminal bidirectional switch 110.As shown in Figure 2, between AC power 100 and load 115, connect three terminal bidirectional switch 110.In addition, with three terminal bidirectional switch 110 in parallel contact resistance 111, variable resistor 112 and capacitor 113 concatermer, be timer circuit.The tie point of variable resistor 112 and capacitor 113 is connected with the grid of three terminal bidirectional switch 110 via bidirectional trigger diode 114.In addition, as noise, prevent circuit and the situation of coil or capacitor of appending is also a lot, but omit in Fig. 2.
Fig. 3 is the waveform that has connected ON/OFF state in the situation of incandescent lamp, three terminal bidirectional switch 110 and load voltage, load current as load 115.During the connection of three terminal bidirectional switch 110, the voltage of load voltage and AC power 100 is roughly the same.Because incandescent lamp is almost pure resistance, so the waveform of load current and alternating voltage are similar figures.Near the zero passage of AC supply voltage, when load current becomes than the maintenance electric current hour of three terminal bidirectional switch 110, three terminal bidirectional switch 110 disconnects.In the situation that load 115 is incandescent lamp, as shown in Figure 3, keep electric current to compare enough little with the amplitude of load current.
At the off period of three terminal bidirectional switch 110, from AC power 100 to resistance 111, the path flow of variable resistor 112, capacitor 113, load 115 crosses Weak current, puts aside electric charge in capacitor 113.Compare with load 115, the impedance of dimmer 101 is enough large, so load voltage is roughly zero.When the voltage rising of capacitor 113, when bidirectional trigger diode 114 is connected, three terminal bidirectional switch 110 is connected again.When passing through the operation of dimmer 101, when the resistance value of variable resistor 112 increases, until the time lengthening that three terminal bidirectional switch 110 is connected again.Thus, bearing power reduces, if light output minimizing of incandescent lamp.In addition, as shown in Figure 3, by the zero crossing from AC supply voltage till the phase angle of three terminal bidirectional switch 110 scratch starts is defined as firing angle.If represent firing angle by symbol theta, its desirable scope is 0 ≦ θ≤180[deg].Firing angle is larger, and light output becomes less.
In the present invention, the load 115 in Fig. 2 is LED ignition devices 1 of Fig. 1, and the characteristic that is compared to mutually load from incandescent lamp is different.Specifically, high with the specific impedance of incandescent lamp phase, and to be not limited to as incandescent lamp be pure resistance.Therefore, action waveforms is also not limited to identical with Fig. 3.
The problem of the impulse current that the present invention has in mind then, is described.Fig. 4 is while having connected existing (not considering the countermeasure of impulse current) LED ignition device as the load of dimmer 101, the impulse current action waveforms in king-sized situation that becomes.In this LED ignition device, similarly possess rectification circuit 102, diode 103, capacitor 104, DC-DC translation circuit 105 with device of the present invention, rectification circuit 102 generates commutating voltage, and 104 pairs of commutating voltages of capacitor carry out smoothly, generates DC link voltage.In Fig. 4, so-called rectified current, is the average anode current of rectification circuit 102.The action waveforms that has represented the half period of AC power 100 in Fig. 4.
Take the power circuit of electric capacity input mode in basic LED ignition device, as shown in Figure 4, considering that DC link voltage is than the situation of commutating voltage high (Vdc2>Vdc1) when the connection of three terminal bidirectional switch 110.Firing angle at three terminal bidirectional switch 110 is little, in the situation of dimming level high (bright) or when generating the capacity of capacitor 104 of DC link voltage, this situation easily occurs when large.Now, even if three terminal bidirectional switch 110 is connected, also do not flow through rectified current, therefore as shown in Figure 4, three terminal bidirectional switch misses extinguishing arc immediately.
After mistake extinguishing arc, through after time to a certain degree, before the capacitor 113 of the timer circuit of dimmer 101 is re-charged electricity, three terminal bidirectional switch 110 is not connected again.According to Fig. 4, the moment (Vdc1=Vdc2) that exists commutating voltage to equate with DC link voltage after mistake extinguishing arc.In the situation that not connecting dimmer 101, in the power circuit of electric capacity input mode, now start to flow through the impulse current to capacitor 104 chargings, even rectified current.But, connecting dimmer 101, and when three terminal bidirectional switch 110 has disconnected as shown in Figure 4, flowing through hardly rectified current.
In Fig. 4, when three terminal bidirectional switch 110 is connected the moment of (scratch start again) again, AC supply voltage (absolute value) become than DC link voltage high (| Vac|>Vdc2).Now, the voltage of capacitor 104 sharply increases, for capacitor 104 chargings are produced to large impulse current.According to Fig. 4, three terminal bidirectional switch 110 again the moment of scratch start start to flow through sharp rectified current, this rectified current is the impulse current to capacitor 104 charging.In addition, in the situation that not connecting dimmer 101, than start to flow through rectified current the moment, be moment in the moment more late (phase place is leading) of Vdc1=Vdc2 to start to flow through rectified current, therefore, the effective value of rectified current increases.In addition, about three terminal bidirectional switch 110 in Fig. 4 again the action after scratch start describing below, therefore in this description will be omitted.
Then, concrete structure and the action of the LED ignition device in the 1st execution mode of the present invention be described and can prevent thus flickering and reduce the reason of impulse current.Fig. 5 is shunt circuit 107 in the 1st execution mode of the present invention and the structure example of commutation circuit 108.(wherein, in Fig. 5, also having represented rectification circuit 102 other inscapes such as grade).In addition, Fig. 6 is by forming as shown in Figure 5 the action waveforms of the LED ignition device that shunt circuit 107 and commutation circuit 108 obtain.
The shunt circuit 107 of Fig. 5 is concatermers of resistance 126 and switch element 127.In Fig. 5, switch element 127 is made as to MOSFET, but also can uses the element of other kinds such as bipolar transistor or IGBT.
Trailing edge delay circuit 118 consists of resistance 123, diode 124, capacitor 125, the switch element 127 output switching signals to shunt circuit 107.Switch element 127 is MOSFET, and switching signal is equivalent to its grid voltage.In trailing edge delay circuit 118, for the trailing edge of the square-wave signal of comparison circuit 117 output, resistance 123 and capacitor 125 are as RC(low pass) filter carrys out work.Therefore, in the output signal of comparison circuit 117, becoming after L level, the voltage of capacitor 125, is that switching signal slowly reduces according to RC filter time constant.That is, from the output signal of comparison circuit 117, become L level, until switch element 127 postpones before disconnecting., because diode 124 is by the effect of resistance 123 bypass, there is hardly delay as described above in the rising edge for the output signal of comparison circuit 117.Therefore, when commutating voltage becomes lower than reference voltage, when the output signal of comparison circuit 117 becomes high level (being denoted as below H level), switch element 127 demand workings.In addition, can replace capacitor 125 and utilize the parasitic capacitance of switch element 127, therefore, the use of capacitor 125 is arbitrarily.
By above structure, as shown in Figure 6, commutating voltage lower than reference voltage during and commutating voltage become than reference voltage height after until during through time of delay of wishing, the switch element 127 in shunt circuit 107 is connected.
The action of the 1st execution mode is described according to Fig. 6.When commutating voltage becomes lower than reference voltage, commutation circuit 108 is connected the switch element of shunt circuit 107 127, makes resistance 126 conducting between DC output end of rectification circuit 102.In addition, now the three terminal bidirectional switch 110 of dimmer 101 has disconnected.The path flow of the resistance 111 from AC power 100 to dimmer 101, variable resistor 112, capacitor 113, resistance 126 is crossed Weak current, thus to capacitor 113 chargings.
At capacitor 113, be recharged, when three terminal bidirectional switch 110 is connected, commutating voltage increases to the value roughly the same with AC supply voltage (absolute value).It is higher than reference voltage that commutating voltage becomes, but now immediately switch element 127 is not disconnected, but maintain as mentioned above the connection of switch element 127, until the time through wishing.Therefore, even DC link voltage than commutating voltage high (Vdc2>Vdc1), do not flow through the electric current to capacitor 104 charging, by flow through the rectified current keeping more than electric current in shunt circuit 107, three terminal bidirectional switch 110 does not also miss extinguishing arc and maintains connection.
At three terminal bidirectional switch 110, maintain under the state of connection, in the moment of rectified current and DC link voltage consistent (Vdc2=Vdc1), flow through the electric current to capacitor 104 chargings.Therefore, as shown in Figure 6, rectified current sharply increases.But, for the above reasons, to compare with existing (not considering the countermeasure of impulse current) LED ignition device, the increment of rectified current now correspondingly reduces, and as a result of, the effective value of rectified current also diminishes.From commutating voltage, become than reference voltage height during through time of hope, switch element 127 disconnects.After this, as long as keep electric current large to the current ratio of capacitor 104 chargings, three terminal bidirectional switch 110 just continues to connect.
Along with the carrying out of the charging of capacitor 104, rectified current reduces.At DC link voltage, roughly reach peak value, rectified current becomes than keeping the little moment of electric current, and three terminal bidirectional switch 110 disconnects.After three terminal bidirectional switch 110 disconnects, the voltage by the capacitor 104 that is recharged, be DC link voltage, DC-DC translation circuit 105 is also stably worked.In addition, in the moment that three terminal bidirectional switch 110 disconnects, rectified current is reduced to the moment keeping below electric current, in each cycle of AC power, changes hardly, and therefore flickering does not occur yet.
In addition, the structure shown in Fig. 5 is for realize an example of the on/off control of the switch element 127 shown in Fig. 6 with simple circuit.As long as can realize the on/off control of the switch element 127 shown in Fig. 6, the structure of shunt circuit 107 and commutation circuit 108 also can be different from Fig. 5.Fig. 7 is other examples of shunt circuit 107.In Fig. 7, resistance 129, Zener diode 130, MOSFET131 form voltage regulator circuit 128, have connected the concatermer of resistance 126 and switch element (MOSFET) 127 as its load.Also can replace MOSFET131 and use the semiconductor element of other kinds such as bipolar transistor or IGBT.
When commutating voltage is higher than Zener voltage, the voltage that the concatermer of resistance 126 and switch element (MOSFET) 127 is applied become with the Zener voltage of Zener diode 130 about equally.That is, voltage regulator circuit plays the effect to commutating voltage clamp.In addition, when switch element 127 is connected, the electric current flowing through in shunt circuit 107 does not rely on commutating voltage and constant, can adjust by resistance 126.In the action of Fig. 6, before the moment of Vdc2=Vdc1, maintain three terminal bidirectional switch 110 connection during, flow through the electric current larger than the maintenance electric current of three terminal bidirectional switch 110.If the shunt circuit of Fig. 7, the adjustment by resistance 126 is suppressed to necessary Min. by electric current, therefore, effective for the low-lossization of shunt circuit 107.
As shown in Figure 7, can with the concatermer of resistance 126 and switch element 127 in parallel contact resistance 132 adjust the electric current that flows through shunt circuit 107.In the structure of whole shunt circuits 107 in the present invention, be not always the case.The connection of resistance 132 is arbitrarily.
Fig. 8 is other examples of commutation circuit 108.In Fig. 8, in the rear class of trailing edge delay circuit 118, connect the comparison circuit 133 being formed by comparator 134 and voltage source 135, comparison circuit 133 output switching signals.When the output voltage of trailing edge delay circuit 118 is higher than the voltage of voltage source 135, switching signal is H level, and the switch element of shunt circuit 107 127 is connected.That is, the on/off threshold value of the switch element shown in Fig. 6 127 replaces with the voltage of voltage source 135.In the needed high-power situation of driving of switch element 127, can at random append drive circuit in the rear class of comparison circuit 133.
The structure of Fig. 8 of take also can be carried out following change as basis.First, make the output logic reversion of comparison circuit 117 and 133.Specifically, when pretreated commutating voltage is higher than the voltage of voltage source 122, comparison circuit 117 output H level.Also identical about comparison circuit 133.Then, trailing edge delay circuit 118 is changed to rise edge delay circuit.The rising edge of the square-wave signal that rise edge delay circuit is only exported for comparison circuit 117 carrys out work as RC filter.Specifically, the direction of diode 124 is reversed, anode is connected with the lead-out terminal of comparison circuit 117.
Fig. 9 is another other examples of shunt circuit 107 and commutation circuit 108.In the shunt circuit of Fig. 9, append the concatermer of resistance 136 and switch element 137, the concatermer of be connected in parallel 2 groups of resistance and switch element.In addition, commutation circuit 108 is exported the output signal of comparison circuit 117 as the switching signal of switch element 137.That is, the constantly different switching signal of commutation circuit two on/off of 108 outputs.By this structure, commutating voltage lower than reference voltage during and commutating voltage become than reference voltage height after through during till the time of hope, can change the size of the electric current flowing through in shunt circuit 107.In addition, as shown in Figure 7, can append voltage regulator circuit and the load using the concatermer of 2 groups of resistance and switch element as voltage regulator circuit is connected.In these other examples, by 2 groups of concatermers, easily adjust the electric current of shunt circuit 107, in addition, making aspect 2 groups of concatermer minute loses heat, be also effective.
As mentioned above, in the 1st execution mode of the present invention, can make dimmer steady operation suppress flickering, and can reduce impulse current.By the reduction of impulse current, small-sized, the low loss of surge resistance, capacitor 104, input filter parts changes into as possibility.In addition, the 1st execution mode of the present invention can solve flicker control and impulse current reduce this two problems by structure, for LED ignition device small-sized, cost degradation is also effective.
Figure 10 is other examples of commutation circuit 108.Figure 11 is the action waveforms obtaining in the situation of the combination commutation circuit 108 of Figure 10 and the shunt circuit 107 of Fig. 5.In the commutation circuit 108 of Figure 10, the trailing edge delay circuit 118 of Fig. 8 is changed as delay circuit 149.Delay circuit 149 is the RC filters that consist of resistance 123 and capacitor 125.As shown in figure 11, in the rising edge of output and the both sides of trailing edge of comparison circuit 117, the voltage of capacitor 125 increases or reduces along with RC filter time constant.Therefore, not only the switch element after commutating voltage becomes than reference voltage height until in shunt circuit 107 127 postpones before disconnecting, and at commutating voltage, becomes low rear until also postpone before switch element 127 connections than reference voltage.At this, by the magnitude of voltage of the voltage source of Figure 10 135 being made as to the value that approaches L level, the latter's delay is reduced to almost negligible degree as shown in Figure 11.Thus, the on/off of switch element 127 almost identical with shown in Fig. 6 constantly.
Figure 12 is another other examples of shunt circuit 107 and commutation circuit 108.The pre-process circuit 116 shown in Fig. 5, the such segmentation of comparison circuit 117 in the commutation circuit 108 of Figure 12, have been omitted.In Figure 12, shunt circuit 107 be take Fig. 7 as basis, as the load of the voltage regulator circuit being formed by MOSFET131 etc., and the concatermer of contact resistance 126 and switch element 127.But, as the difference with Fig. 7, with the Zener diode 130 of voltage regulator circuit contact resistance 150 and capacitor 151 in parallel.This voltage regulator circuit is also a part for commutation circuit 108, and resistance 150 and capacitor 151 and resistance 129 are worked as the RC filter in Figure 10.
In commutation circuit 108, by comparator 152, compare the output voltage of voltage regulator circuit and the voltage of voltage source 153.When the output voltage of voltage regulator circuit is lower than the voltage of voltage source 153, the switching signal of the output of device 152 becomes H level as a comparison, and the switch element 127 of shunt circuit 107 is connected.
Figure 13 is used the action waveforms obtaining in the shunt circuit 107 of Figure 12 and the situation of commutation circuit 108.Three terminal bidirectional switch 110 is connected, and commutating voltage becomes than after reference voltage height, and the voltage of Zener diode 130 slowly increases along with the time constant being determined by resistance 129 and 150, capacitor 151, reaches the puncture voltage of Zener diode 130.
Now, the output voltage of voltage regulator circuit is along with the voltage of Zener diode 130 slowly increases.Thus, as shown in figure 13, after commutating voltage becomes than reference voltage height, it is higher than the voltage of voltage source 135 that the output voltage of voltage regulator circuit becomes, and before switch element 127 disconnects, can postpone.The on/off of switch element 127 is almost identical with shown in Fig. 6 constantly.
In these other examples, can form shunt circuit 107 and commutation circuit 108 with less parts number, for device small-sized, cost degradation is effective.
Figure 14 is the basic block diagram of the LED ignition device in the 2nd execution mode of the present invention.With respect to the 1st execution mode shown in Fig. 1, in the 2nd execution mode, append the resistance 138 for detection of the electric current flowing through in capacitor 104.In addition, commutation circuit 108 is except commutating voltage, also according to passing through the detected electric current output switching of resistance 138 signal.Resistance 138 can be connected with the optional position in Figure 14 under the condition of electric current that can detect capacitor 104.In addition, also can replace resistance 138, the electric current of the current sensor Detection capacitance device 104 by other kinds.
By detecting the rectified current electric current of Detection capacitance device 104 indirectly.
Figure 15 is the internal structure example of the commutation circuit 108 in the 2nd execution mode of the present invention.Shunt circuit 107 other inscapes such as grade in Figure 15, have also been represented.Figure 16 is by forming as shown in Figure 15 the action waveforms of the LED ignition device that commutation circuit 108 obtains.In Figure 16, imagination is carried out the electric current of Detection capacitance device 104 indirectly by detecting as described above rectified current.
In the commutation circuit 108 of Figure 15, for the circuit shown in Fig. 5, append the comparison circuit 139 being formed by comparator 140 and voltage source 141.At this, comparator 140 is made as open collector output, still, according to other structures, also can use the comparator that is not open collector output.Comparison circuit 139 compares the reference current showing by the detected electric current of resistance 138 (be denoted as below detect electric current) and magnitude of voltage as voltage source 141.In Figure 15, used the logic of comparison circuit 139 output L level when detection current ratio reference current is large.Thus, when detection current ratio reference current is large, switching signal becomes L level forcibly, and the switch element 127 of shunt circuit 107 disconnects.In commutation circuit 108, can by detecting electric current, directly not input comparison circuit 139, and via the pre-process circuit input shown in 116 grades of Fig. 5.Particularly pre-process circuit being made as to the structure of integrating circuit or low pass filter, is effective for the removal that detects the radio-frequency component of electric current.
The action of the 2nd execution mode is described according to Figure 16.Same with the 1st execution mode shown in Fig. 6, at commutating voltage, become and not immediately switch element 127 is disconnected afterwards than reference voltage height, but before the time through wishing, maintain the connection of switch element 127.The moment at rectified current with DC link voltage consistent (Vdc1=Vdc2), flow through the electric current to capacitor 104 chargings, rectified current sharply increases.Thus, detect electric current and become larger than reference current, therefore, carve at this moment switch element 127 and disconnect forcibly.Like this, in the 2nd execution mode, automatically generated the predetermined time of delay in the 1st execution mode as " detecting electric current became than the large time before of reference current ".In addition, detect current ratio reference current little during, the output signal of comparison circuit 139 becomes open-collector H level, therefore, on the not impact of other circuit, moves identical with the 1st execution mode.
If Vdc2=Vdc1, starts to flow through the electric current to capacitor 104 chargings, though in shunt circuit 107 not current flowing also can maintain the connection of three terminal bidirectional switch 110.In the 2nd execution mode, can, by being made as Min. during current flowing in shunt circuit 107, can reduce the loss of shunt circuit 107.
In addition, the structure shown in Figure 15 is for realize an example of the on/off control of the switch element 127 shown in Figure 16 with simple circuit.As long as can realize the on/off control of the switch element 127 shown in Figure 16, the structure of shunt circuit 107 and commutation circuit 108 can be different from Figure 15.Also the shunt circuit 107 shown in can application drawing 7～Fig. 9 or other examples of commutation circuit 108.
Figure 17 is other examples of the basic block diagram of the LED ignition device in the 2nd execution mode of the present invention.In Figure 17, replace the electric current of Detection capacitance device 104 in Figure 14 and detect DC link voltage.In addition, commutation circuit 108 is according to commutating voltage and DC link voltage output switching signal.As the concrete action of the commutation circuit 108 in Figure 17, detect the moment of commutating voltage and DC link voltage consistent (Vdc1=Vdc2), if with the commutation circuit of Figure 15 similarly by switch element 127 disconnections, can realize the action shown in Figure 16.Omit the concrete structure of the commutation circuit 108 in these other examples.
Figure 18 has specifically represented the structure of rectification circuit 102, DC-DC translation circuit 105 in the LED ignition device shown in Fig. 1.In addition, for the LED ignition device of Figure 14 or Figure 17, also can apply same structure.In Figure 18, the full-wave rectifying circuit based on diode bridge 142 is equivalent to rectification circuit 102.In addition, the buck circuit that the resistance 147 of being used by diode 143, MOSFET144, choking-winding 145, capacitor 146, current detecting, control circuit 148 form is equivalent to DC-DC translation circuit 105.In addition, also can append coil that fuse, surge resistance, input filter use or capacitor etc.According to the voltage of LED load 106, can not use buck chopper device and use buck-boost chopper or boost chopper, or if desired insulation also can be used flyback converter.Also can replace MOSFET144 and use the element of other kinds such as bipolar transistor or IGBT.
In Figure 18, control circuit 148 is controlled DC-DC translation circuit 105 to the electric current of LED load 106 outputs according to current setting value.Specifically, considered before the electric current that flows through MOSFET144 reaches current setting value the control of MOSFET144 connection.
By being controlled at the electric current flowing through in MOSFET144, can indirectly control the electric current flowing through in LED load 106.The control IC that such control circuit 148 can be used with commercially available LED forms simply.Certainly, also can be with controlling IC, the discrete parts such as combination comparator do not form, also can utilize microcomputer or digital signal processor to form as software.
Claims (10)
1. a LED ignition device, possesses: the rectification circuit that is commutating voltage by AC voltage conversion; Via the 1st diode, be connected with the direct current outlet side of described rectification circuit, described commutating voltage be transformed to the 1st capacitor of DC link voltage; Convert described DC link voltage and carry out the DC-DC translation circuit to LED load supplying; Based on described commutating voltage, export the current setting circuit of the current setting value of described DC-DC translation circuit; Be connected between DC output end of described rectification circuit, possess the shunt circuit of the concatermer of at least one resistance and switch element; Control the commutation circuit of the switch element in described concatermer, described LED ignition device is characterised in that,
Described commutation circuit, described commutating voltage lower than the reference voltage of wishing during and be carved into while becoming higher than the reference voltage of described hope from described commutating voltage through moment of time of hope during, the switch element at least one concatermer in described concatermer is connected.
2. LED ignition device according to claim 1, is characterized in that,
Described commutation circuit, by from described commutating voltage, become than the reference voltage of described hope high time be carved into the time that moment that the electric current that flows through described the 1st capacitor becomes larger than the reference current of hope is set as the hope in claim 1.
3. LED ignition device according to claim 1, is characterized in that,
Described commutation circuit, by from described commutating voltage, become than the reference voltage of described hope high time be carved into the time that the described commutating voltage moment consistent with described DC link voltage is set as the hope claim 1.
4. according to the LED ignition device described in any one in claims 1 to 3, it is characterized in that,
Described commutation circuit comprises: output described commutating voltage higher than the reference voltage of described hope during be the 1st comparison circuit of low level signal; Output is given the time of delay of the time constant based on hope to the trailing edge of the output signal of the 1st comparison circuit and the trailing edge delay circuit of the signal that obtains,
By the output signal of this trailing edge delay circuit, control described switch element.
5. LED ignition device according to claim 4, is characterized in that,
Described trailing edge delay circuit comprises: the 1st resistance connecting between the lead-out terminal of described the 1st comparison circuit and the earth and the concatermer of the 2nd capacitor; The 2nd diode being connected in parallel with described the 1st resistance,
One end of described resistance is connected with the lead-out terminal of described the 1st comparison circuit, and one end of described the 2nd capacitor is connected with the earth, and the anode terminal of described the 2nd diode is connected with the lead-out terminal of described the 1st comparison circuit.
6. according to the LED ignition device described in any one in claims 1 to 3, it is characterized in that,
Described shunt circuit possesses 2 above resistance and the concatermer of switch element, described commutation circuit, described commutating voltage lower than the reference voltage of described hope during and be carved into while becoming higher than the reference voltage of described hope from described commutating voltage through moment of time of hope during, for the switch element at least 1 concatermer in described concatermer being controlled for connecting, export the 1st switching signal, in addition, described commutating voltage lower than the reference voltage of described hope during, for the switch element at least 1 concatermer in described concatermer being controlled for connecting, export the 2nd switching signal.
7. LED ignition device according to claim 6, is characterized in that,
Described commutation circuit comprises: output described commutating voltage higher than described reference voltage during be the 1st comparison circuit of low level signal; Output to the trailing edge of the output signal of the 1st comparison circuit give the time constant based on hope time of delay and the trailing edge delay circuit of signal, the output signal of this trailing edge delay circuit is made as to described the 1st switching signal, the output signal of described the 1st comparison circuit is made as to the 2nd switching signal.
8. according to the LED ignition device described in any one in claim 1 to 7, it is characterized in that,
The resistance that described shunt circuit possesses and the concatermer of switch element are connected between DC output end of described rectification circuit.
9. according to the LED ignition device described in any one in claim 1 to 7, it is characterized in that,
The magnitude of voltage that described shunt circuit possesses with described hope carries out the voltage regulator circuit of clamp to described commutating voltage, the resistance that described shunt circuit possesses is connected as the load of described voltage regulator circuit with the concatermer of switch element.
10. according to the LED ignition device described in any one in claims 1 to 3, it is characterized in that,
Described shunt circuit possesses: the 2nd resistance connecting between DC output end of described rectification circuit and the concatermer of Zener diode; The 3rd resistance and the 3rd capacitor that are connected in parallel with this Zener diode; Gate terminal is connected to the MOSFET that drain terminal is connected with the side of the positive electrode of the direct current output of rectification circuit with the tie point of described the 2nd resistance and described Zener diode; The 4th resistance connecting between the source terminal of this MOSFET and the negative side of the direct current of rectification circuit output; The described resistance being connected in parallel with the 4th resistance and the concatermer of switch element,
Described the 2nd resistance, Zener diode, the 3rd resistance, the 3rd capacitor and the MOSFET that described commutation circuit possesses described shunt circuit is also used as the inscape of described commutation circuit, possess output becomes the 2nd comparison circuit of low level signal when the source terminal voltage ratio fiducial value of described MOSFET is high, by the output signal of the 2nd commutation circuit, controls described switch element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012169068A JP5975774B2 (en) | 2012-07-31 | 2012-07-31 | LED lighting device |
| JP2012-169068 | 2012-07-31 |
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| Publication Number | Publication Date |
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| CN103582250A true CN103582250A (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310329742.4A Pending CN103582250A (en) | 2012-07-31 | 2013-07-31 | LED lighting on device |
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| JP (1) | JP5975774B2 (en) |
| CN (1) | CN103582250A (en) |
| TW (1) | TW201419940A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105407573A (en) * | 2015-12-01 | 2016-03-16 | 上海新进芯微电子有限公司 | Light emitting diode (LED) output control circuit and method, and LED lighting system |
| CN113163556A (en) * | 2021-05-08 | 2021-07-23 | 深圳市必易微电子股份有限公司 | Load drive suppression circuit and load power supply system |
| CN113271699A (en) * | 2015-06-08 | 2021-08-17 | 松下知识产权经营株式会社 | Light modulation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6287766B2 (en) * | 2014-11-10 | 2018-03-07 | 株式会社今仙電機製作所 | Driving signal and apparatus for vehicle direction indicator and driving method thereof |
| JP6070753B2 (en) * | 2015-04-09 | 2017-02-01 | 三菱電機株式会社 | Lighting device and lighting apparatus |
| WO2016181513A1 (en) * | 2015-05-12 | 2016-11-17 | 俊蔵 大島 | Power supply device |
| JP7256075B2 (en) * | 2019-06-07 | 2023-04-11 | ニチコン株式会社 | Power supply for lighting and its protection circuit |
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| MXPA06005602A (en) * | 2004-05-19 | 2006-08-17 | Goeken Group Corp | Dimming circuit for led lighting device with means for holding triac in conduction. |
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| JP2012134001A (en) * | 2010-12-21 | 2012-07-12 | Sharp Corp | Led drive circuit and led illumination lamp using the same |
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- 2013-07-31 CN CN201310329742.4A patent/CN103582250A/en active Pending
Patent Citations (2)
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| US20090072764A1 (en) * | 2007-08-01 | 2009-03-19 | Koito Manufacturing Co., Ltd. | Lighting controlling device of vehicle lighting equipment |
| CN102187737A (en) * | 2008-10-22 | 2011-09-14 | 赤多尼科两合股份有限公司 | Circuit for the operation of at least one LED |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271699A (en) * | 2015-06-08 | 2021-08-17 | 松下知识产权经营株式会社 | Light modulation device |
| CN113271699B (en) * | 2015-06-08 | 2023-12-05 | 松下知识产权经营株式会社 | Light modulation device |
| CN105407573A (en) * | 2015-12-01 | 2016-03-16 | 上海新进芯微电子有限公司 | Light emitting diode (LED) output control circuit and method, and LED lighting system |
| CN105407573B (en) * | 2015-12-01 | 2017-12-12 | 上海新进芯微电子有限公司 | A kind of LED output control circuits, method and LED illumination System |
| CN113163556A (en) * | 2021-05-08 | 2021-07-23 | 深圳市必易微电子股份有限公司 | Load drive suppression circuit and load power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5975774B2 (en) | 2016-08-23 |
| TW201419940A (en) | 2014-05-16 |
| JP2014029763A (en) | 2014-02-13 |
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Application publication date: 20140212 |