CN104717800B - Supply unit and LED lamp devices - Google Patents
Supply unit and LED lamp devices Download PDFInfo
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- CN104717800B CN104717800B CN201410784578.0A CN201410784578A CN104717800B CN 104717800 B CN104717800 B CN 104717800B CN 201410784578 A CN201410784578 A CN 201410784578A CN 104717800 B CN104717800 B CN 104717800B
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- 230000006837 decompression Effects 0.000 claims abstract description 37
- 230000005611 electricity Effects 0.000 claims description 16
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
Supply unit and LED lamp devices suppress to produce undesirable condition in the case of light load.If inductor current (IL) vanishing before restarting the cycle (T) as defined in being reached in the elapsed time lighted from the time for turning on thyristor (Q1), decompression control unit (21) reaches that the time point for restarting the cycle (T) turns on thyristor (Q1) in the elapsed time.And, restart inductor current (IL) vanishing after cycle T if reached in the elapsed time, decompression control unit (21) turns on thyristor (Q1) at the time point of inductor current (IL) vanishing.Therefore, in the LED lamp devices of present embodiment, in the case that load is light load (the relatively low LED load of rated voltage (5)), buck circuit (1) will not also be acted in a continuous mode.Therefore, compared with the past case that buck circuit is acted in a continuous mode in the case of gently loading, the generation of the undesirable conditions such as the lifetime of thyristor (Q1) can be suppressed.
Description
Technical field
The present invention relates to a kind of supply unit of a variety of loads for supporting that rated voltage is different and by above-mentioned a variety of loads
In any one load be set to LED (light emitting diode) LED lamp devices.
Background technology
As past case, Japanese Unexamined Patent Publication No 2013-165598 (hereinafter referred to as " document 1 ") is exemplified described
Supply unit and lighting device.Past case described in document 1 is used to light to be installed on lamp socket by loading and unloading freely
The LED of straight pipe type, the buck chopper electricity for possessing the rated voltage that the DC voltage provided from dc source is depressurized to LED
Road (supply unit).
Here, in Japanese electric light TIA standard JEL801 " the straight pipe type LED systems with L-shaped stitch lamp holder GX16t-5
Unite (general lighting use) " in, the rated voltage of straight pipe type LED, which is set to 45 volts~95 volts a wide range of, (wherein, is
The situation of 40 types).
In the past case described in document 1, it is configured to：When the rated voltage of the straight pipe type LED as load is high
Buck circuit is acted with critical conduction mode, and when rated voltage is low, buck circuit is acted in a continuous mode.
In addition, the low straight pipe type LED of the standard value of rated voltage ratio above-mentioned standard appears in a part of in the market.To
What the straight pipe type LED of deviation standard like this was acted in a continuous mode as the load and buck circuit of past case
In the case of, it is possible to unexpected undesirable condition can be produced.That is, in the past case described in document 1, being designed to
Even in using the straight pipe type LED of standard compliant minimum rated voltage (45 volts) as load in the case of buck chopper electricity
Road is also normally acted.However, as described above using the substandard straight pipe type LED of rated voltage as load feelings
Under condition, exist and produce the loss of the thyristor for constituting buck circuit and exceed design load and thyristor
The undesirable condition such as lifetime worry.
The content of the invention
Therefore, it is an object of the invention to suppress to produce undesirable condition in the case of light load.
The supply unit of the present invention is characterised by possessing：Buck circuit, its direct current that will be provided from dc source
Input voltage decompression after be supplied to load；And control circuit, it controls the action of above-mentioned buck circuit, above-mentioned decompression
Chopper circuit has：Thyristor, it makes above-mentioned input voltage interrupted；And inductor, it be not applied in
The energy accumulated when being applied in above-mentioned input voltage via above-mentioned thyristor, above-mentioned control are released when stating input voltage
Circuit processed is configured to：After above-mentioned thyristor is turned on, reached in the inductor current for flowing through above-mentioned inductor
End above-mentioned thyristor during defined peak value, if from making the time point of above-mentioned thyristor conducting
The elapsed time risen reaches defined above-mentioned inductor current vanishing before restarting the cycle, then is reached in the above-mentioned elapsed time
State and restart the time point in cycle and turn on above-mentioned thyristor, above-mentioned the cycle is restarted if reached in the above-mentioned elapsed time
Above-mentioned inductor current vanishing afterwards, then make above-mentioned thyristor at the time point of above-mentioned inductor current vanishing
Conducting.
The LED lamp devices of the present invention are characterised by possessing above-mentioned supply unit, and being configured to LED load can load and unload
Ground is connected between the output end of above-mentioned supply unit.
In the supply unit and LED lamp devices of the present invention, in the case where load is not light load, control circuit makes
Buck circuit is acted with discontinuous mode, in the case where load is light load, and control circuit makes buck chopper electricity
Road is acted with critical conduction mode, therefore buck circuit also will not be with the progressive die in the case that load is light load
Formula is acted.Therefore, have the following effects that：With in the case of light load buck circuit acted in a continuous mode
Past case compare, the generation of the undesirable conditions such as the lifetime of thyristor can be suppressed.
Brief description of the drawings
The preferred embodiment of the present invention is described in further detail.Then can be more preferable with reference to the following detailed description and accompanying drawing
Understand other features and advantages of the present invention.
Fig. 1 represents the embodiment of supply unit involved in the present invention and LED lamp devices, is to be used to illustrate critical module
The timing diagram of the action of formula.
Fig. 2 is the circuit diagram in the embodiment of supply unit involved in the present invention and LED lamp devices.
Fig. 3 is the electricity of the decompression control unit in the embodiment of supply unit involved in the present invention and LED lamp devices
Lu Tu.
Fig. 4 is discontinuous in the embodiment of supply unit involved in the present invention and LED lamp devices for illustrating
The timing diagram of the action of pattern.
Embodiment
Below, 1~Fig. 4 of reference picture describes the implementation of supply unit and LED lamp devices involved in the present invention in detail
Mode.
As shown in Fig. 2 the LED lamp devices of present embodiment are by buck circuit 1, control block 2 and dc source
Portion 3 is constituted.
DC power portion 3 is configured to be converted to the alternating voltage provided from commercial ac power source 4, alternating current desired
DC voltage, DC current.The DC power portion 3 is by filtering part 30, rectification circuit 31, PFC (Power Factor
Correction：Power-factor improvement) portion 32, smoothing capacity device C1 constitute.Filtering part 30 is used to remove to be inputted from AC power 4
Alternating voltage, the higher hamonic wave noise that is superimposed in alternating current and PFC portions 32 in the higher hamonic wave noise that produces.Rectification circuit
31 are made up of diode bridge, and full-wave rectification is carried out to alternating voltage, the alternating current provided from AC power 4.PFC portions 32 be with
Toward known boost chopper, by the way that the pulsating volage being rectified after the full-wave rectification of circuit 31 is converted into desired direct current
Press to improve power factor.Smoothing capacity device C1 makes the output voltage in PFC portions 32 smooth., will be from addition, in the following description
The DC voltage that DC power portion 3 is input to buck circuit 1 is referred to as DC input voitage VDC.But, DC power portion 3
Said structure is not limited to, such as can also be output DC voltage, the battery of DC current, solar cell.
Buck circuit 1 is by thyristor (field-effect transistor) Q1, inductor T1, diode D1, electric capacity
Device C2, detection resistance device R1, resistor R2, R9 etc. are constituted.Thyristor Q1, inductor T1, capacitor C2 and inspection
The series circuit that measuring resistance device R1 is in series is connected between the output end of DC power portion 3.Diode D1 negative electrode connection
In thyristor Q1 and inductor T1 tie point, diode D1 anode is connected to detection resistance device R1 and resistor
R9 tie point.Resistor R9 is connected in parallel with diode D1, resistor R2 one end and thyristor Q1 grid
Connection.Moreover, being connected with LED load 5 at capacitor C2 two ends.
The straight pipe type LED that LED load 5 e.g. illustrates in the prior art, uses lamp socket (not shown) or connector
LED load 5 is detachably connected between the output end of buck circuit 1 (capacitor C2 two ends).
Control block 2 is constituted by controlling with IC 20, external circuit element and control power supply generating unit 27, control IC
20 are made up of high-withstand-voltage integrated circuit (High Voltage Integrated Circuit).
Control power supply generating unit 27 is made up of switching power circuit, based on DC input voitage VDC generation control power supply electricity
Press Vcc.
Control IC 20 possesses decompression control unit 21, high-end (high-side) drive division 22, operational amplifier 23, switch
24th, sequence circuit portion 25, PFC control units 26, voltage grading resistor R3, R4 etc..In addition, control be provided with IC 20 CS terminals,
ZCD terminals, OP+ terminals, OP- terminals, OPout terminals, Ho terminals, HGND terminals, HVcc terminals, Vcc terminal, Do terminals, GND
The terminals such as terminal.
Sequence circuit portion 25 be configured to since connect AC power 4 come to the input ac voltage of DC power portion 3
Time point (is hereinafter referred to as power on time point.) rise elapsed time carry out timing.Also, sequence circuit portion 25 is configured to：
Opened if the above-mentioned elapsed time has reached the boost action time started (such as 0.5 second) to the output of PFC control units 26 boost action
Beginning signal S1, is exported if the above-mentioned elapsed time has reached that decompression acts the time started (such as 0.7 second) to decompression control unit 21
Decompression action commencing signal S2.
When exporting boost action commencing signal S1 from sequence circuit portion 25, PFC control units 26 are from Do terminal output drivings
Signal, makes the thyristor in composition PFC portions 32 is (not shown) to carry out switch motion.Also, PFC control units 26 are configured to
Feedback control is carried out by the dutycycle of the thyristor to PFC portions 32 to make the output voltage of DC power portion 3 (straight
Flow input voltage VDC) fixed voltage for as defined in.Wherein, this PFC control units 26 are in the past known, therefore omit detailed
Structure and the diagram and explanation of action.
High-side driver portion 22 is used to be driven the thyristor Q1 of buck circuit 1, is configured to use
The voltage provided from HVcc terminals carrys out the grid output drive signal from Ho terminals to thyristor Q1.In addition,
Bootstrapping (bootstrap) circuit by power source voltage Vcc boosting is controlled is equipped with outside at HVcc terminals.Boostrap circuit is by diode D2
And the capacitor C3 being connected between HGND terminals and HVcc terminals is constituted.Diode D2 anode is with being transfused to control power supply
The Vcc terminal connection of voltage vcc.Diode D2 negative electrode is connected with HVcc terminals.That is, boostrap circuit from control power supply
Generating unit 27 is filled with path as diode D2, capacitor C3, the resistor R9 of buck circuit 1 to capacitor C3
Electricity, will be above controlling the control source of power source voltage Vcc to HVcc terminals using capacitor C3 charging voltage.
The non-inverting input terminal (OP+ terminals) of operational amplifier 23 is transfused to reference voltage V s, inversing input terminal
(OP- terminals) is transfused to detection resistance device R1 both end voltage, in lead-out terminal (OPout terminals) between inversing input terminal
It is connected with feedback resistor R7 and capacitor C4 parallel circuit.Reference voltage V s is to control by voltage grading resistor R5, R6
The voltage (Vs=Vcc × R6/ (R5+R6)) obtained after power source voltage Vcc partial pressure.In addition, detection resistance device R1 both end voltage
(hereinafter referred to as detect voltage Vx.) it is the voltage being directly proportional to the output current Io of buck circuit 1.
Moreover, constituting reversion amplification electricity by feedback resistor R7 and capacitor C4 parallel circuit and operational amplifier 23
Road.The reversion amplifying circuit will detect that voltage Vx and reference voltage V s contrast reversal amplification is after-applied and arrive voltage grading resistor R3, R4
Series circuit.One end of voltage grading resistor R3, R4 series circuit is connected with the lead-out terminal of operational amplifier 23, the other end
It is connected to ground via GND terminal.Moreover, being used as threshold voltage X1 by the voltage obtained after voltage grading resistor R3, R4 partial pressure
It is input into decompression control unit 21.In addition, applying control power source voltage Vcc, the computing via 24 pairs of operational amplifiers 23 of switch
Amplifier 23 is configured to act when switching 24 connection, stopped when switching 24 disconnection.
As shown in figure 3, decompression control unit 21 is by first comparator 210, upper limit clamp circuit 211, lower limit clamp circuit
212nd, the second comparator 213, trigger (FF) circuit 214, restart timing circuit 215, one shot (one-shot) circuit 216 with
And multiple logic circuits etc. are constituted.
Upper limit clamp circuit 211 is configured to the terminal voltages of ZCD terminals (in the inductor T1 of buck circuit 1
The voltage induced in assists winding T2) Vzc clampers higher limit as defined in.In addition, lower limit clamp circuit 212 be configured to by
The terminal voltage Vzc clampers of ZCD terminals lower limit as defined in.
The negative terminal of first comparator 210 is transfused to the terminal voltage Vzc of ZCD terminals, the plus end of first comparator 210
Input two kinds of threshold values VH, VL of height with being selected a property.That is, first comparator 210 is in thyristor Q1
The threshold value of the terminal voltage Vzc of ZCD terminals and higher side (is hereinafter referred to as high threshold during conducting.) VH is compared, if end
Sub- voltage Vzc is then exported from high level higher than high threshold VH and is reversed to low level.If in addition, terminal voltage Vzc exceedes high threshold
VH, the then threshold value for being input into the plus end of first comparator 210 switches to the threshold value of a relatively low side (referred to below as from high threshold VH
For Low threshold.)VL.Then, first comparator 210 is electric by the terminal of ZCD terminals when thyristor Q1 is in cut-off
Pressure Vzc and high threshold VH is compared, and is exported if terminal voltage Vzc is less than Low threshold VL from low level and is reversed to high level.
In addition, restarting restarting for timing circuit 215 with described later to the output of first comparator 210 in the first logical AND circuit AND1
Logic and operation is carried out between output VT.
Second comparator 213 is configured to：The terminal voltage (detection voltage Vx) of CS terminals is compared with threshold voltage X1
Compared with, detect voltage Vx be more than threshold voltage X1 when make output CSout be high level, detection voltage Vx be less than threshold voltage
It is low level to make output CSout during X1.In addition, the output CSout in the first logic or circuit OR1 to the second comparator 213
With by phase inverter INV will decompression act the signal obtained after commencing signal S2 reversion between carry out logic or computing.
The set terminal of FF circuits 214 is transfused to answering for the first logical AND circuit AND1 output LED_S, FF circuit 214
Position terminal is transfused to the first logic or the lead-out terminal of circuit OR1 output CSout, FF circuit 214 is connected to the 3rd logical AND
A circuit AND3 input terminal.That is, FF circuits 214 are changed into as the first logical AND circuit AND1 output LED_S
Output is changed into high level during high level, if the first logic or circuit OR1 output CSout are changed into high electricity when being output as high level
It is flat then output be changed into low level.
Outputs and decompression of the 3rd logical AND circuit AND3 to FF circuits 214 act the logical AND between commencing signal S2 and entered
Row computing.3rd logical AND circuit AND3 output is provided to high-side driver portion 22.That is, high-side driver portion 22 is constituted
For during the 3rd logical AND circuit AND3 is output as high level output drive signal lead thyristor Q1
Logical, being output as low level period in the 3rd logical AND circuit AND3 ends thyristor Q1.
The rising synchronous of the logical AND circuit AND3 of single-shot trigger circuit 216 and the 3rd output by single trigger pulse signal PS
It is output to the second logical AND circuit AND2.Second logical AND circuit AND2 starts letter to single trigger pulse signal PS and decompression action
Logical AND between number S2 carries out computing.Second logical AND circuit AND2 lead-out terminal restarts timing circuit 215 with being placed on
Field-effect transistor 2150 grid connection.That is, the second logical AND circuit AND2 is configured to：Start in decompression action
In the case that signal S2 is high level, only make to be output as high level within the short time that single trigger pulse signal PS is high level
Turn on field-effect transistor 2150.
Timing circuit 215 is restarted when external field-effect transistor 2150 is in cut-off with capacitor of the constant current to inside
Charging (not shown), makes to restart on output VT when the both end voltage (restarting input voltage vin) of above-mentioned capacitor reaches threshold value
It is upgraded to high level.In addition, restart timing circuit 215 be configured to when the second logical AND circuit AND2 is output as high level and field is imitated
Make above-mentioned capacitor discharge when answering transistor 2150 to turn on.Here, field-effect transistor 2150 is only in single trigger pulse signal PS
To be turned in the short time of high level, end when single trigger pulse signal PS is changed into low level.Thus, restart timing circuit
215 are configured to repeat following action with fixed cycle (restarting the cycle) T：During the conducting of scene effect transistor 2150
Make capacitor discharge, capacitor is charged with constant current again afterwards.Wherein, it is by restarting timing circuit 215 that this, which restarts cycle T,
The capacity of capacitor, the size of charging current and threshold value and determine.
Then, reference picture 1 and Fig. 4 timing diagram come describe in detail decompression control unit 21 action.
First, reference picture 4 illustrates that rated voltage high LED load 5 relatively is connected to the output end of buck circuit 1
Situation.
When connecting AC power 4, DC input voitage VDC is input into control power supply generating unit 27, direct current input
Voltage VDC be the rectified full-wave rectification of circuit 31 and by be smoothed behind PFC portions 32 capacitor C1 smoothing obtained from.So
Afterwards, control power supply generating unit 27 (is hereinafter referred to as power on time from the time point for being transfused to above-mentioned DC input voitage VDC
Point.) generation control power supply be supplied to each portion.
When controlling power source voltage Vcc to rise, sequence circuit portion 25 starts action.Sequence circuit portion 25 is from power on
Time lights to be made on the boost action commencing signal S1 of the output of PFC control units 26 by the time point of boost action time started
It is upgraded to high level.PFC control units 26 start the action in PFC portions 32 when boost action commencing signal S1 is changed into high level.So
Afterwards, when PFC portions 32 are acted, by control power supply generating unit 27 generate control power supply come to decompression control unit 21 control power supply is provided
Voltage vcc.
Also, from power on time light by decompression action the time started (>The boost action time started) when
Between point (moment t=t0), the decompression action commencing signal S2 for being output to decompression control unit 21 from sequence circuit portion 25 is changed into high electricity
It is flat.In addition, in a period of from power on time point to moment t=t0, decompression action commencing signal S2 is low level, therefore
3rd logical AND circuit AND3 is output as low level, therefore not from the output drive signal of high-side driver portion 22.
Restart timing circuit 215 to open from decompression acts the time point (moment t=t0) that commencing signal S2 is changed into high level
The charging of beginning capacitor, the time point (moment t=t1) of threshold value is reached in the both end voltage (restarting input voltage vin) of capacitor
Make to restart output VT and rise to high level.In addition, acting time point (the moment t=that commencing signal S2 is changed into high level from decompression
T0 the time (t1-t0)) untill restarting output VT and rising to high level is equal with restarting cycle T.
Do not acted, therefore will not be felt in assists winding T2 in moment t=t1 time point buck circuit 1
Voltage should be gone out, the terminal voltage Vzc of ZCD terminals is low level, so that less than the high threshold VH of first comparator 210, therefore the
The output of one comparator 210 is maintained high level.
On the other hand, when restarting output VT in moment t=t1 and rising to high level, the first logical AND circuit AND1's is defeated
Go out LED_S and rise to high level, the output of FF circuits 214 rises to high level.Moreover, when the output of FF circuits 214 is changed into high
During level, the 3rd logical AND circuit AND3 input is high level, therefore the 3rd logical AND circuit AND3 output rises to
High level.As a result, from the output drive signal of high-side driver portion 22, thyristor Q1 is changed into conducting, buck chopper electricity
Road 1 starts action and output current Io (inductor current IL) gradually increases.
In addition, the output by the 3rd logical AND circuit AND3 is changed into high level, one shot is exported from single-shot trigger circuit 216
Pulse signal PS.Then, make to be output as high electricity the second logical AND circuit AND2 and single trigger pulse signal PS rising synchronous
It is flat, and synchronously make to be output as low level with single trigger pulse signal PS decline.Restart the scene effect crystal of timing circuit 215
Make capacitor discharge in the short time that pipe 2150 is on, the time ended from field-effect transistor 2150, which lights, to be started again at
The charging (counting for restarting cycle T) of capacitor.
With output current Io increase, detection voltage Vx also rises, when detection voltage Vx reaches threshold voltage X1
Between the output CSout of the second comparator of point (moment t=t2) 213 be changed into high level.First logic or circuit OR1 are due to the second ratio
Output CSout compared with device 213 rises to high level and output LED_R is risen to high level.Moreover, the reset of FF circuits 214
Terminal is high level, therefore the output of FF circuits 214 drops to low level.As a result, the 3rd logical AND circuit AND3 output
Low level is dropped to, no longer from the output drive signal of high-side driver portion 22, so that thyristor Q1 ends.
When thyristor Q1 ends, the energy accumulated in inductor T1 is released and regenerative current (inductor
Electric current IL) flowing.But, the regenerative current (inductor current IL) process over time and be gradually reduced.In addition, ought partly lead
The polarity inversion for the voltage that body switch element Q1 is induced when ending in assists winding T2, therefore the terminal voltage of ZCD terminals
Vzc rises to high level and is higher than high threshold VH.As a result, the output of first comparator 210 drops to low level, and the first ratio
Threshold value compared with device 210 from high threshold VH switches to Low threshold VL.
When regenerative current (inductor current IL) vanishing (moment t=t3), the terminal voltage Vzc of ZCD terminals declines
It is less than Low threshold VL for low level.As a result, the output of first comparator 210 rises to high level, and first comparator 210
Threshold value switch to high threshold VH from Low threshold VL.
Here, as shown in figure 4, from the time point (moment t=t2) of thyristor Q1 cut-offs to regenerative current (electricity
Sensor electric current IL) vanishing time point (moment t=t3) elapsed time (=t3-t2) than restarting the weight of timing circuit 215
Open cycle T short.Thus, at moment t=t3 time point, it is still low level to restart output VT, therefore the first logical AND circuit
AND1 output LEDS_S is also still low level.Therefore, the output of FF circuits 214 is also still low level, the 3rd logical AND circuit
AND3 output is also low level, therefore not from the output drive signal of high-side driver portion 22.
In addition, when the energy accumulated in inductor T1 is all released and regenerative current (inductor current IL) vanishing
When, inductor T1 both end voltage free vibration, the terminal voltage Vzc of ZCD terminals also vibrates.However, due to first comparator
210 threshold value switches to high threshold VH from Low threshold VL, therefore the terminal voltage Vzc of ZCD terminals peak value is no more than high threshold
VH, the output of first comparator 210 is maintained high level.But, even if the peak value for the terminal voltage Vzc of ZCD terminals occur surpasses
Cross high threshold VH situation, due to restart output VT be low level, therefore the first logical AND circuit AND1 output also will not on
It is upgraded to high level.
Then, restart timing circuit 215 restart input voltage vin and reach threshold value time point (moment t=t4), i.e. from
Moment t=t1 makes to restart output VT by the time point for restarting cycle T rises to high level.First logical AND circuit AND1 is when weight
Opening when output VT rises to high level makes output LED_S rise to high level.As a result, the output of FF circuits 214 is changed into high electricity
Flat, further, the 3rd logical AND circuit AND3 output is also changed into high level, so as to believe from the output driving of high-side driver portion 22
Number and thyristor Q1 turn on.Hereafter (moment t4~) repeats moment t1~t4 action, is applied from buck circuit 1
Plus rated voltage, so that LED load 5 is lighted.That is, the pattern of the decompression control unit 21 shown in Fig. 4 is to flow through inductor T1
The discontinuous discontinuous modes of inductor current IL.
Then, reference picture 1 illustrates that the relatively low LED load 5 of rated voltage is connected to the output end of buck circuit 1
Situation.
Wherein, from the action of power on time point untill moment t=t2 passes through and the discontinuous mode shown in Fig. 4
Situation is identical, therefore omits the description.
After moment t=t2 thyristor Q1 cut-offs, restart timing circuit 215 and restarting input voltage vin
Reach the time point (moment t=t3) of threshold value, make to restart on output VT from moment t=t1 by restarting the time point of cycle T
It is upgraded to high level.However, being not yet reduced to zero, therefore the end of ZCD terminals in moment t=t3 regenerative current (inductor current IL)
Sub- voltage Vzc is still high level, is not less than Low threshold VL, therefore the output of first comparator 210 is maintained low level.
It is additionally, since that to restart output VT be high level and first comparator 210 is output as low level, therefore first patrols
The output LED_S collected with circuit AND1 is still low level, and the output of FF circuits 214 is also still low level.As a result, the 3rd logic
Output with circuit AND3 is also maintained low level, therefore not from the output drive signal of high-side driver portion 22.
Then, when regenerative current (inductor current IL) vanishing (moment t=t4), the terminal voltage Vzc of ZCD terminals
Drop to low level and be less than Low threshold VL.As a result, the output of first comparator 210 rises to high level, and first compares
The threshold value of device 210 switches to high threshold VH from Low threshold VL.
Here, high level is had turned into due to restarting output VT, therefore in regenerative current (inductor current IL) vanishing
Time point (moment t=t4), the first logical AND circuit AND1 output LEDS_S rose to high level.Therefore, FF circuits 214
Output is changed into high level, and the 3rd logical AND circuit AND3 output is also changed into high level, therefore exports drive from high-side driver portion 22
Dynamic signal and thyristor Q1 is turned on.Hereafter (moment t4~) repeats moment t1~t4 action, from buck chopper electricity
Road 1 applies rated voltage, so that LED load 5 is lighted.That is, decompression control unit 21 proportion during inductor current IL circulates
Open timing circuit 215 restart cycle T length in the case of semiconductor switch is synchronously made with the zero crossing with inductor current IL
The critical conduction mode of element Q1 conductings is acted.
As described above, the supply unit (LED lamp devices) of present embodiment possesses：Buck circuit 1, it will be from straight
Load (LED load 5) is supplied to after the input voltage decompression for the direct current that stream power supply (DC power portion 3) is provided；And control electricity
Road (decompression control unit 21), it controls the action of buck circuit 1.
Buck circuit 1 has：Thyristor Q1, it makes input voltage interrupted；And inductor T1, its
The energy accumulated when being applied in input voltage via thyristor Q1 is released when not being applied in input voltage.
Control circuit (decompression control unit 21) is configured to：After thyristor Q1 is turned on, inductance is being flowed through
Device T1 inductor current IL ends thyristor Q1 when reaching defined peak value.In addition, if from making partly to lead
The elapsed time that the time of body switch element Q1 conductings lights reaches that defined inductor current IL before restarting cycle T is changed into
Zero, then control circuit (decompression control unit 21) to reach that the time point for restarting cycle T makes thyristor Q1 in the elapsed time
Conducting.Also, restart inductor current IL vanishing after cycle T if reached in the elapsed time, then control circuit (decompression control
Portion 21 processed) turn on thyristor Q1 at the time point of inductor current IL vanishing.
The supply unit (LED lamp devices) of present embodiment is (specified for light load even in load by said structure
The relatively low LED load 5 of voltage) in the case of, buck circuit 1 will not also be acted in a continuous mode.Therefore, with
The past case that buck circuit is acted in a continuous mode in the case of light load is compared, and can suppress semiconductor switch member
The generation of the undesirable conditions such as part Q1 lifetime.
In addition, the supply unit (LED lamp devices) of present embodiment is by the semiconductor switch member of buck circuit 1
Part Q1 is connected to the structure of hot side compared to inductor T1.Because, in Japanese electric light TIA standard JEL801
The input voltage of buck circuit 1 in " the straight pipe type LED lamp system (general lighting use) with L-shaped stitch lamp holder GX16t-5 "
It is defined as less than 300 volts.That is, by the thyristor Q1 of buck circuit 1 compared to inductor T1 connections
In the case of the structure of low potential, the input voltage of buck circuit 1 can be more than 300 volts.
Furthermore, it is contemplated that the deviation (± 20%) of the cycle set in high-withstand-voltage integrated circuit, in order to avoid household appliances
Infrared remote controller used in frequency band 33kHz~40kHz, will preferably restart cycle T and for example be set as 20 μ seconds (50,000
It is conspicuous).By so setting, even in misconnection in the case of rated voltage at a fairly low LED load 5, also will not merely due to
As critical conduction mode so as to thyristor Q1 switching frequency and infrared remote controller band overlapping and supply unit
(LED lamp devices) breaks down.
The present invention is described by several preferred embodiments, but those skilled in the art can not depart from original of the invention
Carry out various amendments and deformation this spirit and scope, i.e. claims.
Claims (3)
1. a kind of supply unit, it is characterised in that possess：
Buck circuit, it is supplied to load after input voltage of direct current provided from dc source is depressured；And control
Circuit, it controls the action of above-mentioned buck circuit,
Above-mentioned buck circuit has：Thyristor, it makes above-mentioned input voltage interrupted；And inductor, its
Release and accumulated when being applied in above-mentioned input voltage via above-mentioned thyristor when not being applied in above-mentioned input voltage
Energy,
Above-mentioned control circuit has：Drive division, it drives above-mentioned thyristor；And decompression control unit, it is to above-mentioned
Drive division is controlled to make above-mentioned buck circuit be acted with discontinuous mode or critical conduction mode,
Above-mentioned decompression control unit is configured to：Above-mentioned drive division is controlled, after above-mentioned thyristor is turned on,
End above-mentioned thyristor during peak value as defined in being reached in the inductor current for flowing through above-mentioned inductor, if from
The elapsed time that the time for turning on above-mentioned thyristor lights reaches defined above-mentioned inductor before restarting the cycle
Electric current vanishing, then reach that the above-mentioned time point for restarting the cycle turns on above-mentioned thyristor in the above-mentioned elapsed time,
Thus above-mentioned buck circuit is made to be acted with above-mentioned discontinuous mode,
Above-mentioned decompression control unit is also configured such as：Above-mentioned drive division is controlled, it is turned on making above-mentioned thyristor
Afterwards, above-mentioned thyristor is ended during peak value as defined in being reached in the inductor current for flowing through above-mentioned inductor, if
From make the above-mentioned elapsed time that the time of above-mentioned thyristor conducting lights reach it is above-mentioned restart it is above-mentioned after the cycle
Inductor current vanishing, then turn at the time point of above-mentioned inductor current vanishing above-mentioned thyristor, by
This makes above-mentioned buck circuit be acted with above-mentioned critical conduction mode.
2. supply unit according to claim 1, it is characterised in that
Above-mentioned decompression control unit has：
Restart timing circuit, it is restarted the cycle and made to restart output and rise to high level and export single trigger pulse signal as above-mentioned；
First comparator, the inductor current being directly proportional to above-mentioned inductor current is detected voltage and high threshold and Low threshold by it
It is compared；
Second comparator, its detection voltage that output current to above-mentioned buck circuit is directly proportional is carried out with threshold voltage
Compare, output is set to high level when above-mentioned detection voltage is more than above-mentioned threshold voltage, also, it is small in above-mentioned detection voltage
Output is set to low level when above-mentioned threshold voltage；And
Flip-flop circuit, the set terminal of the flip-flop circuit is transfused to the output of above-mentioned first comparator and above-mentioned one shot arteries and veins
The logical AND of signal is rushed, it is high electricity that the reseting terminal of the flip-flop circuit, which is transfused in above-mentioned buck circuit action process,
The reverse signal of flat decompression action commencing signal and the logic of the output of above-mentioned second comparator or,
Above-mentioned decompression control unit exports the output that above-mentioned decompression acts commencing signal and above-mentioned flip-flop circuit to above-mentioned drive division
Logical AND,
Above-mentioned drive division turns on above-mentioned thyristor when above-mentioned logical AND is high level.
3. a kind of LED lamp devices, it is characterised in that
Possess supply unit according to claim 1 or 2, be configured to LED load and be detachably connected to above-mentioned power supply
Between the output end of device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013259392A JP6292503B2 (en) | 2013-12-16 | 2013-12-16 | Power supply device and LED lighting device |
| JP2013-259392 | 2013-12-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104717800A CN104717800A (en) | 2015-06-17 |
| CN104717800B true CN104717800B (en) | 2017-08-22 |
Family
ID=53416624
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| 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 |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6292503B2 (en) |
| CN (1) | CN104717800B (en) |
Families Citing this family (2)
| 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 |
| JP7449722B2 (en) * | 2020-03-03 | 2024-03-14 | 大光電機株式会社 | Offline lighting equipment |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3829534B2 (en) * | 1999-05-26 | 2006-10-04 | 松下電工株式会社 | Discharge lamp lighting device |
| JP2006278009A (en) * | 2005-03-28 | 2006-10-12 | Matsushita Electric Works Ltd | Dimmer |
| JP5508095B2 (en) * | 2010-03-30 | 2014-05-28 | パナソニック株式会社 | Lighting device, lighting fixture using the same, and lighting system |
| JP5693870B2 (en) * | 2010-04-13 | 2015-04-01 | ミネベア株式会社 | Switching power supply circuit |
| EP2410821B1 (en) * | 2010-07-20 | 2014-01-08 | Panasonic Corporation | Lighting device of semiconductor light-emitting element and illumination fixture using the same |
| JP5891454B2 (en) * | 2011-04-18 | 2016-03-23 | パナソニックＩｐマネジメント株式会社 | Semiconductor light-emitting element lighting device and lighting fixture using the same |
| 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 |
| JP5884046B2 (en) * | 2011-10-24 | 2016-03-15 | 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 |
| JP2013165598A (en) * | 2012-02-13 | 2013-08-22 | Panasonic Corp | Power supply device and luminaire and lighting fixture using the same |
-
2013
- 2013-12-16 JP JP2013259392A patent/JP6292503B2/en active Active
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- 2014-12-16 CN CN201410784578.0A patent/CN104717800B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP6292503B2 (en) | 2018-03-14 |
| JP2015119509A (en) | 2015-06-25 |
| CN104717800A (en) | 2015-06-17 |
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