CN104717800A - Power supply device and LED lightening device - Google Patents
Power supply device and LED lightening device Download PDFInfo
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- CN104717800A CN104717800A CN201410784578.0A CN201410784578A CN104717800A CN 104717800 A CN104717800 A CN 104717800A CN 201410784578 A CN201410784578 A CN 201410784578A CN 104717800 A CN104717800 A CN 104717800A
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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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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
A power supply device and an LED lightening device can prevent bad conditions generated in a light load condition. If the inductor current IL is zero before the elapsed time reaches a predetermined re-start cycle T from the time of turning on the semiconductor switching element Q1, a step-down control unit 21 enables the semiconductor switching element Q1 to be turned on when the elapsed time reaches the re-start cycle T. In addition, if the inductor current IL is zero after the elapsed time reaches the re-start cycle T, the step-down unit 21 turns on the semiconductor switching element Q1 at the time when the inductor current IL becomes zero. Accordingly, in the LED lightening device of this embodiment, even if the load is a light load (LED load 5 of relatively low rated voltage), a step-down chopper circuit 1 is not operated in continuous mode. Therefore, as compared with the conventional example in which the step-down chopper circuit in the case of light load would operate in a continuous mode, bad conditions that the service life of semiconductor switching elements Q1 is short can be prevented.
Description
Technical field
The present invention relates to a kind of supply unit of the multiple load supporting rated voltage different and any one load in above-mentioned multiple load be set to the LED lamp device of LED (light-emitting diode).
Background technology
As past case, exemplify the supply unit described in Japanese Unexamined Patent Publication No 2013-165598 (hereinafter referred to " document 1 ") and lighting device.Past case described in document 1 is installed on the LED of the straight pipe type of lamp socket for lighting the mode of loading and unloading freely, possess the buck circuit (supply unit) direct voltage provided from DC power supply being depressurized to the rated voltage of LED.
At this, in Japanese electric light TIA standard JEL801 " the straight pipe type LED lamp system (general lighting is used) of band L shape stitch lamp holder GX16t-5 ", the rated voltage of straight pipe type LED is set to the situation of 40 types (wherein, be) on a large scale of 45 volts ~ 95 volts.
In the past case described in document 1, be configured to: when the rated voltage height of the straight pipe type LED as load, buck circuit carries out action with critical conduction mode, and when rated voltage is low, buck circuit carries out action in a continuous mode.
In addition, the straight pipe type LED that the standard value of the above-mentioned standard of rated voltage ratio is low appears on a part of market.When using the straight pipe type LED departing from standard like this as the load of past case and buck circuit carries out action in a continuous mode, likely can produce beyond thought undesirable condition.That is, in the past case described in document 1, though be designed to when using the straight pipe type LED of standard compliant minimum rated voltage (45 volts) as buck circuit when load also normally action.But, when as described above using substandard for rated voltage straight pipe type LED as load, there is the worry producing the loss of thyristor forming buck circuit and exceed the undesirable conditions such as the lifetime of design load and thyristor.
Summary of the invention
Therefore, the object of the invention is to suppress to produce undesirable condition in underloaded situation.
The feature of supply unit of the present invention is to possess: buck circuit, and it is supplied to load by after the input voltage step-down of the direct current provided from DC power supply, and control circuit, it controls the action of above-mentioned buck circuit, and above-mentioned buck circuit has: thyristor, and it makes above-mentioned input voltage interrupted, and inductor, it releases the energy accumulated when being applied in above-mentioned input voltage via above-mentioned thyristor when not being applied in above-mentioned input voltage, above-mentioned control circuit is configured to: after making above-mentioned thyristor conducting, make above-mentioned thyristor end when the inductor current flowing through above-mentioned inductor reaches the peak value of regulation, if reach from the elapsed time making the time of above-mentioned thyristor conducting light regulation restart the cycle before above-mentioned inductor current vanishing, then reach above-mentioned time point of restarting the cycle in the above-mentioned elapsed time and make above-mentioned thyristor conducting, if the above-mentioned elapsed time reach above-mentioned restart the cycle after above-mentioned inductor current vanishing, then make above-mentioned thyristor conducting at the time point of above-mentioned inductor current vanishing.
The feature of LED lamp device of the present invention is to possess above-mentioned supply unit, is configured to LED load and is detachably connected between the output of above-mentioned supply unit.
In supply unit of the present invention and LED lamp device, under load is not underloaded situation, control circuit makes buck circuit carry out action with discontinuous mode, under load is underloaded situation, control circuit makes buck circuit carry out action with critical conduction mode, though therefore under load is underloaded situation buck circuit also can not carry out action in a continuous mode.Therefore, there is following effect: compared with the past case of carrying out action in a continuous mode with buck circuit in underloaded situation, the generation of the undesirable conditions such as the lifetime of thyristor can be suppressed.
Accompanying drawing explanation
In further detail the preferred embodiment of the present invention is described.Then better other features and advantages of the present invention can be understood in conjunction with the following detailed description and accompanying drawing.
Fig. 1 represents the execution mode of supply unit involved in the present invention and LED lamp device, is the sequential chart of the action for illustration of critical conduction mode.
Fig. 2 is the circuit diagram in the execution mode of supply unit involved in the present invention and LED lamp device.
Fig. 3 is the circuit diagram of the step-down control part in the execution mode of supply unit involved in the present invention and LED lamp device.
Fig. 4 is the sequential chart of the action for illustration of the discontinuous mode in the execution mode of supply unit involved in the present invention and LED lamp device.
Embodiment
Below, the execution mode of supply unit involved in the present invention and LED lamp device is described in detail with reference to Fig. 1 ~ Fig. 4.
As shown in Figure 2, the LED lamp device of present embodiment is made up of buck circuit 1, controll block 2 and DC power portion 3.
DC power portion 3 is configured to the direct voltage, the direct current that the alternating voltage provided from commercial ac power source 4, alternating current are converted to expectation.This DC power portion 3 is made up of filtering part 30, rectification circuit 31, PFC (Power Factor Correction: power-factor improvement) portion 32, smmothing capacitor C1.Filtering part 30 is for removing the high order harmonic component noise produced in the alternating voltage inputted from AC power 4, the high order harmonic component noise superposed alternating current and PFC portion 32.Rectification circuit 31 is made up of diode bridge, carries out full-wave rectification to the alternating voltage provided from AC power 4, alternating current.PFC portion 32 is in the past known boost choppers, improves power factor by the direct voltage pulsating voltage after being rectified circuit 31 full-wave rectification being converted to expectation.Smmothing capacitor C1 makes the output voltage in PFC portion 32 level and smooth.In addition, in the following description, the direct voltage being input to buck circuit 1 from DC power portion 3 is called DC input voitage VDC.But DC power portion 3 is not limited to said structure, such as, also can be the storage battery, solar cell etc. of output dc voltage, direct current.
Buck circuit 1 is made up of thyristor (field-effect transistor) Q1, inductor T1, diode D1, capacitor C2, detection resistor R1, resistor R2, R9 etc.The series circuit that thyristor Q1, inductor T1, capacitor C2 and detection resistor R1 are in series is connected between the output of DC power portion 3.The negative electrode of diode D1 is connected to the tie point of thyristor Q1 and inductor T1, and the anode of diode D1 is connected to the tie point detecting resistor R1 and resistor R9.Resistor R9 and diode D1 is connected in parallel, and one end of resistor R2 is connected with the grid of thyristor Q1.And, be connected with LED load 5 at the two ends of capacitor C2.
LED load 5 is such as the straight pipe type LED illustrated in the prior art, uses not shown lamp socket or connector LED load 5 to be detachably connected between the output (two ends of capacitor C2) of buck circuit 1.
Controll block 2 is made up of control IC 20, external circuit element and control power supply generating unit 27, and this control IC 20 is made up of high-withstand-voltage integrated circuit (High Voltage Integrated Circuit).
Control power supply generating unit 27 to be made up of switching power circuit, generate based on DC input voitage VDC and control power source voltage Vcc.
Control IC 20 possesses step-down control part 21, high-end (high-side) drive division 22, operational amplifier 23, switch 24, sequence circuit portion 25, PFC control part 26, voltage grading resistor R3, R4 etc.In addition, control IC 20 is provided with the terminals such as CS terminal, ZCD terminal, OP+ terminal, OP-terminal, OPout terminal, Ho terminal, HGND terminal, HVcc terminal, Vcc terminal, Do terminal, GND terminal.
Sequence circuit portion 25 is configured to from connecting AC power 4 is come the time point of DC power portion 3 input ac voltage (hereinafter referred to power on time point.) rise elapsed time carry out timing.And, sequence circuit portion 25 is configured to: if the above-mentioned elapsed time reaches the boost action time started (such as 0.5 second), export boost action commencing signal S1 to PFC control part 26, if the above-mentioned elapsed time reaches the step-down action time started (such as 0.7 second), to step-down control part 21 output buck action commencing signal S2.
When exporting boost action commencing signal S1 from sequence circuit portion 25, PFC control part 26, from Do terminal output drive signal, makes the thyristor in formation PFC portion 32 (not shown) carry out switch motion.Further, PFC control part 26 be configured to by the duty ratio of the thyristor to PFC portion 32 carry out FEEDBACK CONTROL make the output voltage (DC input voitage VDC) of DC power portion 3 be regulation fixed voltage.Wherein, this PFC control part 26 is in the past known, therefore omits diagram and the explanation of detailed construction and action.
High-side driver portion 22, for driving the thyristor Q1 of buck circuit 1, is configured to use the voltage provided from HVcc terminal to come from the grid output drive signal of Ho terminal to thyristor Q1.In addition, outside HVcc terminal place, be equipped with bootstrapping (bootstrap) circuit by controlling power source voltage Vcc boosting.Boostrap circuit is made up of diode D2 and the capacitor C3 be connected between HGND terminal and HVcc terminal.The anode of diode D2 be transfused to the Vcc terminal controlling power source voltage Vcc and be connected.The negative electrode of diode D2 is connected with HVcc terminal.That is, boostrap circuit charges to capacitor C3 from control power supply generating unit 27 with the path that the resistor R9 of diode D2, capacitor C3, buck circuit 1 is such, utilizes the charging voltage of capacitor C3 to be input to HVcc terminal by higher than the voltage controlling power source voltage Vcc.
The non-inverting input terminal (OP+ terminal) of operational amplifier 23 is transfused to reference voltage V s, inversing input terminal (OP-terminal) is transfused to the both end voltage detecting resistor R1, is connected with the parallel circuits of feedback resistor R7 and capacitor C4 between lead-out terminal (OPout terminal) and inversing input terminal.Reference voltage V s is to the voltage (Vs=Vcc × R6/ (R5+R6)) obtained after control power source voltage Vcc dividing potential drop by voltage grading resistor R5, R6.In addition, the both end voltage of resistor R1 is detected (hereinafter referred to detection voltage Vx.) be the voltage be directly proportional to the output current Io of buck circuit 1.
And, form reversion amplifying circuit by the parallel circuits of feedback resistor R7 and capacitor C4 and operational amplifier 23.The contrast reversal detecting voltage Vx and reference voltage V s is amplified the after-applied series circuit to voltage grading resistor R3, R4 by this reversion amplifying circuit.One end of the series circuit of voltage grading resistor R3, R4 is connected with the lead-out terminal of operational amplifier 23, and the other end is connected to ground via GND terminal.And, be imported into step-down control part 21 by the voltage obtained after voltage grading resistor R3, R4 dividing potential drop as threshold voltage X1.In addition, apply to control power source voltage Vcc via switch 24 pairs of operational amplifiers 23, this operational amplifier 23 is configured to the action when switch 24 is connected, stops when switch 24 disconnects.
As shown in Figure 3, step-down control part 21 by the first comparator 210, upper limit clamp circuit 211, lower limit clamp circuit 212, second comparator 213, trigger (FF) circuit 214, restart timing circuit 215, single (one-shot) circuit 216 and multiple logical circuits etc. of triggering are formed.
Upper limit clamp circuit 211 is configured to the terminal voltage of ZCD terminal (voltage induced in the auxiliary winding T2 of the inductor T1 of buck circuit 1) Vzc clamper to set upper limit value.In addition, lower limit clamp circuit 212 is configured to the lower limit of the terminal voltage Vzc clamper of ZCD terminal to regulation.
The negative terminal of the first comparator 210 is transfused to the terminal voltage Vzc of ZCD terminal, and the plus end of the first comparator 210 inputs height two kinds of threshold value VH, VL with being selected a property.That is, the first comparator 210 when thyristor Q1 is in conducting by the terminal voltage Vzc of ZCD terminal and the threshold value of higher side (hereinafter referred to high threshold.) VH compares, if terminal voltage Vzc is higher than high threshold VH, exports and be reversed to low level from high level.In addition, if terminal voltage Vzc exceedes high threshold VH, then the threshold value being imported into the plus end of the first comparator 210 switches to the threshold value of a lower side (hereinafter referred to Low threshold from high threshold VH.)VL。Then, the terminal voltage Vzc of ZCD terminal and high threshold VH compares when thyristor Q1 is in cut-off by the first comparator 210, if terminal voltage Vzc is lower than Low threshold VL, exports and is reversed to high level from low level.In addition, in the first logical AND circuit AND1 to the output of the first comparator 210 and described laterly restart restarting to export between VT and carrying out logic and operation of timing circuit 215.
Second comparator 213 is configured to: compared with threshold voltage X1 by the terminal voltage (detecting voltage Vx) of CS terminal, make output CSout be high level when detection voltage Vx is more than threshold voltage X1, make output CSout be low level when detecting voltage Vx and being less than threshold voltage X1.In addition, in the first logic OR circuit OR1, logic OR computing is carried out between the output CSout of the second comparator 213 and the signal obtained after being reversed by step-down action commencing signal S2 by inverter INV.
The set terminal of FF circuit 214 is transfused to the output LED_S of the first logical AND circuit AND1, the reseting terminal of FF circuit 214 is transfused to the output CSout of the first logic OR circuit OR1, and the lead-out terminal of FF circuit 214 is connected to an input terminal of the 3rd logical AND circuit AND3.That is, FF circuit 214 exports when the output LED_S of the first logical AND circuit AND1 becomes high level and becomes high level, if exporting as during high level, the output CSout of the first logic OR circuit OR1 becomes high level, exporting and becoming low level.
3rd logical AND circuit AND3 carries out computing to the logical AND between the output of FF circuit 214 and step-down action commencing signal S2.The output of the 3rd logical AND circuit AND3 is provided to high-side driver portion 22.That is, it, to make thyristor Q1 conducting, is make thyristor Q1 end low level period in the output of the 3rd logical AND circuit AND3 that high-side driver portion 22 is configured to output drive signal during the output of the 3rd logical AND circuit AND3 is high level.
Single trigger pulse signal PS is outputted to the second logical AND circuit AND2 by the rising synchronous ground of the output of single-shot trigger circuit 216 and the 3rd logical AND circuit AND3.Second logical AND circuit AND2 carries out computing to the logical AND between single trigger pulse signal PS and step-down action commencing signal S2.The lead-out terminal of the second logical AND circuit AND2 is connected with the grid being placed on the field-effect transistor 2150 of restarting timing circuit 215.That is, the second logical AND circuit AND2 is configured to: when step-down action commencing signal S2 is high level, within the short time that single trigger pulse signal PS is high level, only make output be that high level is to make field-effect transistor 2150 conducting.
Restart timing circuit 215 to charge to the capacitor (not shown) of inside with constant current when external field-effect transistor 2150 is in cut-off, make to restart output VT when the both end voltage (restarting input voltage vin) of above-mentioned capacitor reaches threshold value and rise to high level.In addition, restart timing circuit 215 be configured to output as the second logical AND circuit AND2 for high level and field-effect transistor 2150 conducting time make above-mentioned capacitor discharge.At this, field-effect transistor 2150 is conducting within the short time that single trigger pulse signal PS is high level only, ends when single trigger pulse signal PS becomes low level.Thus, restart timing circuit 215 to be configured to repeat following action with fixing cycle (restarting the cycle) T: make capacitor discharge in the conduction period of scene effect transistor 2150, again charge to capacitor with constant current afterwards.Wherein, this is restarted cycle T and determines by restarting the capacity of capacitor of timing circuit 215, the size of charging current and threshold value.
Then, the sequential chart of reference Fig. 1 and Fig. 4 describes the action of step-down control part 21 in detail.
First, illustrate that LED load 5 that rated voltage is relatively high is connected to the situation of the output of buck circuit 1 with reference to Fig. 4.
When connecting AC power 4, DC input voitage VDC is imported into and controls power supply generating unit 27, this DC input voitage VDC through rectification circuit 31 full-wave rectification and by being obtained by smmothing capacitor C1 smoothing behind PFC portion 32.Then, power supply generating unit 27 is controlled from being transfused to the time point of above-mentioned DC input voitage VDC (hereinafter referred to power on time point.) generate control power supply be supplied to each portion.
When controlling power source voltage Vcc and rising, sequence circuit portion 25 starts action.Sequence circuit portion 25 light from power on time through the time point of boost action time started make to PFC control part 26 export boost action commencing signal S1 rise to high level.PFC control part 26, when boost action commencing signal S1 becomes high level, makes the action in PFC portion 32 start.Then, when 32 action of PFC portion, generate control power supply by control power supply generating unit 27 and provide control power source voltage Vcc to step-down control part 21.
And, lighting the time point (moment t=t0) through step-down action time started (the > boost action time started) from power on time, the step-down action commencing signal S2 outputting to step-down control part 21 from sequence circuit portion 25 becomes high level.In addition, in during from power on time point to moment t=t0, step-down action commencing signal S2 is low level, and therefore the output of the 3rd logical AND circuit AND3 is low level, therefore not from high-side driver portion 22 output drive signal.
Restart the charging of timing circuit 215 beginning capacitor from the time point (moment t=t0) that step-down action commencing signal S2 becomes high level, the time point (moment t=t1) reaching threshold value in the both end voltage (restarting input voltage vin) of capacitor makes to restart and exports VT and rise to high level.In addition, the time point (moment t=t0) becoming high level from step-down action commencing signal S2 is to restarting the time (t1-t0) VT rises to high level of exporting and to restart cycle T equal.
Action is not carried out at the time point buck circuit 1 of moment t=t1, therefore voltage can not be induced in auxiliary winding T2, the terminal voltage Vzc of ZCD terminal is low level, thus lower than the high threshold VH of the first comparator 210, therefore the output of the first comparator 210 is maintained high level.
On the other hand, when restarting output VT at moment t=t1 and rising to high level, the output LED_S of the first logical AND circuit AND1 rises to high level, and the output of FF circuit 214 rises to high level.And when the output of FF circuit 214 becomes high level, the input of the 3rd logical AND circuit AND3 is high level, therefore the output of the 3rd logical AND circuit AND3 rises to high level.Its result, from high-side driver portion 22 output drive signal, thyristor Q1 becomes conducting, and buck circuit 1 starts action and output current Io (inductor current IL) increases gradually.
In addition, become high level by the output of the 3rd logical AND circuit AND3, export single trigger pulse signal PS from single-shot trigger circuit 216.Then, make output be high level the rising synchronous of the second logical AND circuit AND2 and single trigger pulse signal PS, and synchronously make output be low level with the decline of single trigger pulse signal PS.Restart in short time that timing circuit 215 scene effect transistor 2150 is in conducting and make capacitor discharge, the charging (restarting the counting of cycle T) of capacitor lighting again from the time that field-effect transistor 2150 ends.
Along with the increase of output current Io, detect voltage Vx and also rise, the output CSout reaching time point (moment t=t2) second comparator 213 of threshold voltage X1 at detection voltage Vx becomes high level.First logic OR circuit OR1 rises to high level and makes output LED_R rise to high level due to the output CSout of the second comparator 213.And the reseting terminal of FF circuit 214 is high level, and therefore the output of FF circuit 214 drops to low level.Its result, the output of the 3rd logical AND circuit AND3 drops to low level, and no longer from high-side driver portion 22 output drive signal, thus thyristor Q1 ends.
When thyristor Q1 ends, the energy accumulated in inductor T1 is released and regenerative current (inductor current IL) flowing.But this regenerative current (inductor current IL) reduces gradually along with the process of time.In addition, the polarity inversion of the voltage induced in auxiliary winding T2 when thyristor Q1 ends, therefore the terminal voltage Vzc of ZCD terminal rises to high level and higher than high threshold VH.Its result, the output of the first comparator 210 drops to low level, and the threshold value of the first comparator 210 switches to Low threshold VL from high threshold VH.
When regenerative current (inductor current IL) vanishing (moment t=t3), the terminal voltage Vzc of ZCD terminal drops to low level and lower than Low threshold VL.Its result, the output of the first comparator 210 rises to high level, and the threshold value of the first comparator 210 switches to high threshold VH from Low threshold VL.
At this, as shown in Figure 4, the time point (moment t=t2) ended from thyristor Q1 to the time point (moment t=t3) of regenerative current (inductor current IL) vanishing elapsed time (=t3-t2) than restart timing circuit 215 to restart cycle T short.Thus, at the time point of moment t=t3, restarting output VT is still low level, and therefore the output LEDS_S of the first logical AND circuit AND1 is also still low level.Therefore, the output of FF circuit 214 is also still low level, and the output of the 3rd logical AND circuit AND3 is also low level, therefore not from high-side driver portion 22 output drive signal.
In addition, when the energy accumulated in inductor T1 be all released and regenerative current (inductor current IL) vanishing time, the both end voltage free vibration of inductor T1, the terminal voltage Vzc of ZCD terminal also vibrates.But because the threshold value of the first comparator 210 switches to high threshold VH from Low threshold VL, therefore the peak value of the terminal voltage Vzc of ZCD terminal is no more than high threshold VH, and the output of the first comparator 210 is maintained high level.But even if occur that the peak value of the terminal voltage Vzc of ZCD terminal exceedes the situation of high threshold VH, be low level owing to restarting output VT, therefore the output of the first logical AND circuit AND1 also can not rise to high level.
Then, restart timing circuit 215 restart input voltage vin and reach threshold value time point (moment t=t4), namely make to restart through the time point of restarting cycle T from moment t=t1 and export VT and rise to high level.First logical AND circuit AND1 makes output LED_S rise to high level when restarting to export when VT rises to high level.Its result, the output of FF circuit 214 becomes high level, and further, the output of the 3rd logical AND circuit AND3 also becomes high level, thus the thyristor Q1 conducting from high-side driver portion 22 output drive signal.After this (moment t4 ~) repeats the action of moment t1 ~ t4, apply rated voltage, thus LED load 5 is lighted from buck circuit 1.That is, the pattern of the step-down control part 21 shown in Fig. 4 is the discontinuous discontinuous modes of inductor current IL flowing through inductor T1.
Then, illustrate that LED load 5 that rated voltage is relatively low is connected to the situation of the output of buck circuit 1 with reference to Fig. 1.
Wherein, the action passing through from power on time point to moment t=t2 is identical with the situation of the discontinuous mode shown in Fig. 4, therefore omits the description.
After moment t=t2 thyristor Q1 ends, restart timing circuit 215 restart input voltage vin and reach threshold value time point (moment t=t3), namely make to restart through the time point of restarting cycle T from moment t=t1 and export VT and rise to high level.But not yet reduce to zero at moment t=t3 regenerative current (inductor current IL), therefore the terminal voltage Vzc of ZCD terminal is still high level, is not less than Low threshold VL, therefore the output of the first comparator 210 is maintained low level.
And export VT be high level and the output of the first comparator 210 is low level owing to restarting, therefore the output LED_S of the first logical AND circuit AND1 is still low level, and the output of FF circuit 214 is also still low level.Its result, the output of the 3rd logical AND circuit AND3 is also maintained low level, therefore not from high-side driver portion 22 output drive signal.
Then, when regenerative current (inductor current IL) vanishing (moment t=t4), the terminal voltage Vzc of ZCD terminal drops to low level and lower than Low threshold VL.Its result, the output of the first comparator 210 rises to high level, and the threshold value of the first comparator 210 switches to high threshold VH from Low threshold VL.
At this, become high level owing to restarting output VT, therefore rise to high level at the output LEDS_S of time point (moment t=t4) the first logical AND circuit AND1 of regenerative current (inductor current IL) vanishing.Therefore, the output of FF circuit 214 becomes high level, and the output of the 3rd logical AND circuit AND3 also becomes high level, the therefore thyristor Q1 conducting from high-side driver portion 22 output drive signal.After this (moment t4 ~) repeats the action of moment t1 ~ t4, apply rated voltage, thus LED load 5 is lighted from buck circuit 1.That is, step-down control part 21 synchronously makes the critical conduction mode of thyristor Q1 conducting carry out action than restarting restarting cycle T is grown of timing circuit 215 with the zero crossing with inductor current IL during inductor current IL circulates.
As mentioned above, the supply unit (LED lamp device) of present embodiment possesses: buck circuit 1, and it is supplied to load (LED load 5) by after the input voltage step-down of the direct current provided from DC power supply (DC power portion 3); And control circuit (step-down control part 21), the action of its controlled hypotension chopper circuit 1.
Buck circuit 1 has: thyristor Q1, and it makes input voltage interrupted; And inductor T1, it releases the energy accumulated when being applied in input voltage via thyristor Q1 when not being applied in input voltage.
Control circuit (step-down control part 21) is configured to: after making thyristor Q1 conducting, makes thyristor Q1 end when the inductor current IL flowing through inductor T1 reaches the peak value of regulation.In addition, if reach from the elapsed time making the time of thyristor Q1 conducting light regulation restart cycle T before inductor current IL vanishing, then control circuit (step-down control part 21) reaches the time point of restarting cycle T in the elapsed time and makes thyristor Q1 conducting.Further, if the elapsed time reach restart cycle T after inductor current IL vanishing, then control circuit (step-down control part 21) makes thyristor Q1 conducting at the time point of inductor current IL vanishing.
The supply unit (LED lamp device) of present embodiment is by said structure, even if when load is underload (LED load 5 that rated voltage is relatively low), buck circuit 1 also can not carry out action in a continuous mode.Therefore, compared with the past case of carrying out action in a continuous mode with buck circuit in underloaded situation, the generation of the undesirable conditions such as the lifetime of thyristor Q1 can be suppressed.
In addition, the supply unit (LED lamp device) of present embodiment is the structure thyristor Q1 of buck circuit 1 being connected to hot side compared to inductor T1.This is because the input voltage of buck circuit 1 is defined as less than 300 volts in Japanese electric light TIA standard JEL801 " the straight pipe type LED lamp system (general lighting is used) of band L shape stitch lamp holder GX16t-5 ".That is, when the thyristor Q1 of buck circuit 1 is connected to the structure of electronegative potential compared to inductor T1, the input voltage of buck circuit 1 can more than 300 volts.
In addition, consider the deviation (± 20%) of the cycle set in high-withstand-voltage integrated circuit, in order to the 33kHz ~ 40kHz of the frequency band that the infrared remote controller avoiding household appliances uses, preferably will restart cycle T and such as be set as 20 μ second (50 kilo hertzs).By such setting, even if when being connected to the quite low LED load of rated voltage 5 by mistake, also can not only owing to becoming critical conduction mode thus the switching frequency of thyristor Q1 and the band overlapping of infrared remote controller and supply unit (LED lamp device) breaks down.
Describe the present invention by several preferred implementation, but those skilled in the art carry out various correction and distortion with can not departing from the present invention spirit and scope, i.e. claims originally.
Claims (2)
1. a supply unit, is characterized in that, possesses:
Buck circuit, it is supplied to load by after the input voltage step-down of the direct current provided from DC power supply; And control circuit, it controls the action of above-mentioned buck circuit,
Above-mentioned buck circuit has: thyristor, and it makes above-mentioned input voltage interrupted; And inductor, it releases the energy accumulated when being applied in above-mentioned input voltage via above-mentioned thyristor when not being applied in above-mentioned input voltage,
Above-mentioned control circuit is configured to: after making above-mentioned thyristor conducting, make above-mentioned thyristor end when the inductor current flowing through above-mentioned inductor reaches the peak value of regulation, if reach from the elapsed time making the time of above-mentioned thyristor conducting light regulation restart the cycle before above-mentioned inductor current vanishing, then reach above-mentioned time point of restarting the cycle in the above-mentioned elapsed time and make above-mentioned thyristor conducting, if the above-mentioned elapsed time reach above-mentioned restart the cycle after above-mentioned inductor current vanishing, then make above-mentioned thyristor conducting at the time point of above-mentioned inductor current vanishing.
2. a LED lamp device, is characterized in that,
Possess supply unit according to claim 1, be configured to LED load and be detachably connected between the output of above-mentioned supply unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-259392 | 2013-12-16 | ||
| JP2013259392A JP6292503B2 (en) | 2013-12-16 | 2013-12-16 | Power supply device and LED lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104717800A true CN104717800A (en) | 2015-06-17 |
| CN104717800B CN104717800B (en) | 2017-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410784578.0A Expired - Fee Related CN104717800B (en) | 2013-12-16 | 2014-12-16 | Supply unit and LED lamp devices |
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| Country | Link |
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| JP (1) | JP6292503B2 (en) |
| CN (1) | CN104717800B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6620635B2 (en) * | 2016-03-25 | 2019-12-18 | 東芝ライテック株式会社 | Power supply device and lighting device provided with the power supply device |
| KR102358437B1 (en) * | 2017-02-08 | 2022-02-04 | 삼성에스디아이 주식회사 | power supply and a battery pack including the same |
| JP7449722B2 (en) * | 2020-03-03 | 2024-03-14 | 大光電機株式会社 | Offline lighting equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000340385A (en) * | 1999-05-26 | 2000-12-08 | Matsushita Electric Works Ltd | Discharge lamp lighting device |
| JP2006278009A (en) * | 2005-03-28 | 2006-10-12 | Matsushita Electric Works Ltd | Dimmer |
| JP2011210659A (en) * | 2010-03-30 | 2011-10-20 | Panasonic Electric Works Co Ltd | Lighting device and illumination fixture using it, lighting system |
| CN102438349A (en) * | 2010-07-20 | 2012-05-02 | 松下电器产业株式会社 | Lighting device of semiconductor light-emitting element and illumination fixture using the same |
| CN102752908A (en) * | 2011-04-18 | 2012-10-24 | 松下电器产业株式会社 | Semiconductor light-emiting element driver circuit and light fixture using the same |
| CN103068104A (en) * | 2011-10-24 | 2013-04-24 | 松下电器产业株式会社 | Lighting device and lighting fixture using the same |
| CN103249221A (en) * | 2012-02-13 | 2013-08-14 | 松下电器产业株式会社 | Power supply device and lighting device and lighting fixture using the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5693870B2 (en) * | 2010-04-13 | 2015-04-01 | ミネベア株式会社 | Switching power supply circuit |
| JP5834236B2 (en) * | 2011-05-12 | 2015-12-16 | パナソニックＩｐマネジメント株式会社 | Solid light source lighting device and lighting apparatus using the same |
-
2013
- 2013-12-16 JP JP2013259392A patent/JP6292503B2/en active Active
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2014
- 2014-12-16 CN CN201410784578.0A patent/CN104717800B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000340385A (en) * | 1999-05-26 | 2000-12-08 | Matsushita Electric Works Ltd | Discharge lamp lighting device |
| JP2006278009A (en) * | 2005-03-28 | 2006-10-12 | Matsushita Electric Works Ltd | Dimmer |
| JP2011210659A (en) * | 2010-03-30 | 2011-10-20 | Panasonic Electric Works Co Ltd | Lighting device and illumination fixture using it, lighting system |
| CN102438349A (en) * | 2010-07-20 | 2012-05-02 | 松下电器产业株式会社 | Lighting device of semiconductor light-emitting element and illumination fixture using the same |
| CN102752908A (en) * | 2011-04-18 | 2012-10-24 | 松下电器产业株式会社 | Semiconductor light-emiting element driver circuit and light fixture using the same |
| CN103068104A (en) * | 2011-10-24 | 2013-04-24 | 松下电器产业株式会社 | Lighting device and lighting fixture using the same |
| CN103249221A (en) * | 2012-02-13 | 2013-08-14 | 松下电器产业株式会社 | Power supply device and lighting device and lighting fixture using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104717800B (en) | 2017-08-22 |
| JP2015119509A (en) | 2015-06-25 |
| JP6292503B2 (en) | 2018-03-14 |
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