CN104869687B - Power supply device and lighting device - Google Patents
Power supply device and lighting device Download PDFInfo
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- CN104869687B CN104869687B CN201410440556.2A CN201410440556A CN104869687B CN 104869687 B CN104869687 B CN 104869687B CN 201410440556 A CN201410440556 A CN 201410440556A CN 104869687 B CN104869687 B CN 104869687B
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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
Abstract
The present invention provides the power supply device and lighting device of a kind of generation that can inhibit noise without adding element i.e..2nd power supply device (20) of the invention is operated with electric current discontinuous mode, and supply the voltage step-down exported from the 1st power supply device (13) to light source (30), the 2nd power supply device 20 at least has: inductor (23)；Switch element (24), it is conducting by operation, will the energy supply from the 1st power supply device (13) to inductor (23), it is disconnection by operation, supply of energy of the cutting from the 1st power supply device (13) to inductor, and make to put aside the energy releasing in inductor；Control unit (14), control switch element (24).Control unit by switch element from conducting control to disconnect after, during the free vibration for the electric current for flowing through inductor, during after the polarity switching 1 time for flowing through the electric current of inductor to before switching 3 times, switch element is controlled into conducting from disconnecting.
Description
Technical field
Embodiments of the present invention are related to a kind of power supply device and lighting device.
Background technique
When using the load such as step-down switching-converter driving LED (Light Emitting Diode, light emitting diode),
Dc-dc converter is operated sometimes with electric current discontinuous mode.When making dc-dc converter with the operating of electric current discontinuous mode,
It puts aside after the energy of inductor is released, also generates the multiple free vibration of the polarity switching for the electric current for flowing through inductor.Stream
When crossing the polarity switching of the electric current of inductor, electrical noise can be generated.In order to inhibit the generation of noise, need to add inductor or electricity
The noise counter plans element such as container becomes device enlargement or the main reason for increased costs.
Patent document 1: Japanese Unexamined Patent Publication 2013-229234 bulletin
Summary of the invention
The technical problem to be solved in the present invention is that without adding the generation that element is also able to suppress noise.
Power supply device involved in present embodiment is operated with electric current discontinuous mode, and will be from other power supply devices
The voltage step-down of output and supply to load, which at least has: inductor；Switch element is conducting by operation,
By the energy supply from other power supply devices to the inductor, by operation to disconnect, cutting is from described other
Supply of the energy of power supply device to the inductor, and make to put aside the energy releasing in the inductor；Control unit controls institute
Switch element is stated, the switch element after control is connected to disconnect, is being flowed through the inductor by the control unit
During the free vibration of electric current, to the phase before switching 3 times after the polarity switching for flowing through the electric current of the inductor 1 time
Between, it executes the turn-on time by the switch element from control is disconnected to be connected and controls.
In accordance with the invention it is possible to expect to inhibit the generation of noise without adding element.
Detailed description of the invention
Fig. 1 is the perspective view for indicating an example of lighting device involved in embodiment.
Fig. 2 is the figure for indicating an example of the substrate equipped with electrical component.
Fig. 3 is the figure for indicating an example of circuit structure of lighting device.
Fig. 4 is the figure for an example for illustrating the control time of switch element.
Fig. 5 is for illustrating switch element from control is disconnected for the figure of an example of the time of conducting.
Fig. 6 is for illustrating switch element from control is disconnected for the figure of an example of the time of conducting.
When Fig. 7 is using PWM (Pulse Width Modulation, pulse width modulation) Signal-controlled switch element
Pulse width and by switch element from the figure for disconnecting the relationship between time of the control at conducting.
Fig. 8 is to utilize PFM (Pulse Frequency Modulation, pulse frequency modulated) Signal-controlled switch element
When pulse spacing and by switch element from the figure for disconnecting the relationship between time of the control at conducting.
In figure: the 1st power supply device of 13-, 14- control device, the 2nd power supply device of 20-, 21- diode, 22- capacitor,
23- inductor, 24- switch element, 25- resistance, 30- light source, 31- light-emitting component.
Specific embodiment
Power supply device involved in the embodiment illustrated below is operated with electric current discontinuous mode, and will be from it
Its power supply device output voltage step-down and supply to load, which at least has: inductor；Switch element passes through
Operation is conducting, and by the energy supply from other power supply devices to inductor, by operation to disconnect, cutting comes from other electricity
Supply of the energy of source device to inductor, and make to put aside the energy releasing in inductor；Control unit, control switch element, control
Portion processed by the switch element from conducting control for disconnect after, in the free vibration phase for flowing through the electric current of the inductor
Between, during after polarity switching 1 time that flows through the electric current of the inductor to before switching 3 times, execute switch element
It is controlled from control is disconnected at the turn-on time of conducting.According to the power supply device, can expect without adding element and inhibiting noise
Generation.
Moreover, switch element is supplied according to from control unit in power supply device involved in the embodiment illustrated below
Pwm signal and be connected and disconnect, control unit pwm signal pulse width be predetermined length more than when, to switch element supply
To the P WM signal for executing the duty ratio that the turn-on time controls.The pulse width of pwm signal is bigger, during free vibration
The amplitude for flowing through the electric current of inductor is bigger, and the noise generated during free vibration also increases.Therefore, in the arteries and veins of pwm signal
When rushing width to be more than predetermined length, by executing turn-on time control, it can expect to effectively inhibit during free vibration
The noise of generation.
Moreover, control unit is supplying arteries and veins to switch element in power supply device involved in the embodiment illustrated below
When rushing pwm signal of the width less than predetermined length, it is after disconnecting, in the electricity for flowing through inductor that switch element is controlled from conducting
During the free vibration of stream, after polarity switching 3 times or more of the electric current for flowing through inductor, switch element is controlled from disconnection
For conducting.The pulse width of pwm signal is smaller, and the amplitude that the electric current of inductor is flowed through during free vibration is smaller, in freedom
The noise generated during vibration also reduces.Therefore, when the pulse width of pwm signal is smaller, even if not executing turn-on time control
System, will not generate excessive noise.It, can by not executing turn-on time control when the pulse width of pwm signal is smaller
Expectation makes the processing of control unit become simple and reduces processing load.
Moreover, switch element is supplied according to from control unit in power supply device involved in the embodiment illustrated below
PFM signal and be connected and disconnect, control unit PFM signal frequency be predetermined value more than when, to switch element supply execute
The PFM signal of the pulse width of turn-on time control.During free vibration, inductor current declines while switch polarity
Subtract.However, if the duty of PFM signal is relatively high, generate the amplitude of the inductor current during more free vibration compared with
During big, generated noise also increases.Therefore, when the duty ratio of PFM signal is predetermined value or more, by executing conducting
Time control, can expect to effectively inhibit the noise generated during free vibration.
Moreover, load can be semiconductor light-emitting elements in power supply device involved in the embodiment illustrated below.
Moreover, lighting device involved in the embodiment illustrated below has the power supply device, apparatus main body, bears
It carries, load is that the voltage and current supplied according to power supply device carries out luminous light source.
Moreover, lighting device involved in the embodiment illustrated below has: the 1st power supply device；Multiple light sources, point
Light-emitting component that Bao Kuo be 1 or more；Multiple 2nd power supply devices, are operated respectively with electric current discontinuous mode, and will be from
1 power supply device output voltage step-down and supply to each light source；Control device controls multiple 2nd power supply devices respectively, multiple
2nd power supply device at least has respectively: inductor；Switch element is conducting by operation, by the energy from the 1st power supply device
Amount supply is disconnected by operation to inductor, cuts off supply of the energy from the 1st power supply device to inductor, and make to accumulate
The energy releasing in inductor is stored, control device is directed at least any one power supply device of multiple 2nd power supply devices, should
It is after disconnecting, in the free vibration for the electric current for flowing through inductor that the switch element that 2nd power supply device has is controlled from conducting
Period, during after polarity switching 1 time that flows through the electric current of the inductor to before switching 3 times, executing will switch member
Part is from control is disconnected at the turn-on time control of conducting.According to this lighting device, can expect without adding element and inhibiting
The generation of noise.
Moreover, there are load current ratios in multiple light sources in lighting device involved in the embodiment illustrated below
The big light source of other light sources, control device execute turn-on time control to following 2nd power supply device, and the 2nd power supply device is in the future
The light source bigger than other light sources to load current is supplied from after the output voltage decompression of the 1st power supply device.Thereby, it is possible to expect to have
The noisiness for the 2nd power supply device that effect ground inhibits noise yield bigger.
In the following, being illustrated referring to attached drawing to power supply device involved in embodiment and lighting device.In addition, in reality
It applies in mode, the same symbol is marked to structure with the same function, and omit repeated explanation.Moreover, in following embodiment party
The power supply device and lighting device illustrated in formula is merely illustrative, and is not intended to limit the present invention.Moreover, following embodiment party
Formula can carry out appropriately combined in reconcilable range.
(the 1st embodiment)
[structure of lighting device 1]
Fig. 1 is the perspective view for indicating an example of lighting device 1 involved in embodiment.Lighting device 1 is, for example, smallpox
Plate lamp, have apparatus main body 10, cladding system main body 10 entire lower surface lampshade 11.It is set in the lower surface of apparatus main body 10
It is equipped with substrate, which is configured with the light source with a plurality of light-emitting elements.Light source is for example divided into 6 groups, can be independent for every 1 group
Control lighting and light-off, and light modulation.
In the back side for the substrate for being provided with light source, it is connected with by cable etc. equipped with for the electrical of light source power supply
The substrate of element.Light source shines according to the electric power supplied via cable.Lampshade 11 is by shapes such as resin materials with translucency
At penetrating light shot from the light source.Lampshade 11 for example can be transparent, it is possible to have light diffusing.
Lighting device 1 is set to ceiling, has the connection being for example electrically connected with substantially cylindric ceiling rose
Device.Lighting device 1 is and keeping connector chimeric with ceiling rose so that the state directed downwardly of lampshade 11 is fixed on ceiling.
The power supply line of the commercial ac power source introduced from ceiling inboard is connected in ceiling rose.
Fig. 2 is the figure for indicating an example of the substrate 12 equipped with electrical component.It is provided in the center of substrate 12 for matching
Set the opening of the connector chimeric with ceiling rose.Substrate 12 is to be centered around the connector week chimeric with ceiling rose
The mode enclosed is set in lighting device 1.
The voltage of commercial ac power source is converted to the 1st of DC voltage as shown in Fig. 2, being for example provided on the substrate 12
The DC voltage that 1st power supply device 13 is converted is converted into desired voltage and supplied multiple to light source by power supply device 13
2nd power supply device 20-1~6 and the respectively electrical component of control device 14 of the 2nd power supply device 20-1~6 of control etc..In addition,
In the following description, it is referred to as " the 2nd power supply device 20 " when not distinguishing the 2nd power supply device 20-1~6 and being referred to as.
In the present embodiment, it is provided with such as 6 the 2nd power supply devices 20 on the substrate 12.Each 2nd power supply device 20
The each light source for being for example divided into 6 groups is provided with one, and supplies DC voltage to corresponding light source.
1st power supply device 13 receives commercial ac power source, and the quotient that will be received from ceiling rose via connector
DC voltage is converted to the voltage of AC power source.Each 2nd power supply device 20 will be converted into direct current by the 1st power supply device 13
Voltage be converted into desired voltage, and the DC voltage after conversion is supplied to corresponding light source via cable.Each light source
In include light-emitting component shone according to the electric current based on the DC voltage supplied.
[circuit structure of lighting device 1]
Fig. 3 is the figure for indicating an example of circuit structure of lighting device 1.The state of ceiling is fixed in lighting device 1
Under, the input terminal of the 1st power supply device 13 connects via connector, ceiling rose and switch 16 and commercial ac power source 15
It connects.Moreover, the output terminal of the 1st power supply device 13 is connect with the 2nd power supply device 20-1~6 respectively.2nd power supply device 20-1~
6 connect with any one of light source 30-1~6 respectively.In addition, in the following description, not distinguishing light source 30-1~6 and being referred to as
When be referred to as " light source 30 ".
Each 2nd power supply device 20 includes diode 21, capacitor 22, inductor 23, switch element 24, resistance 25.?
In present embodiment, switch element 24 is, for example, MOSFET (Metal Oxide Semiconductor Field Effect
Transistor, Metal Oxide Semiconductor Field Effect Transistor).In addition, as other examples, switch element 24 is also possible to
Bipolar transistor or junction field effect transistor.
The cathode of diode 21 is connected to the node between the output terminal and light source 30 of the 1st power supply device 13.Diode
21 anode is connected to the node between inductor 23 and switch element 24.One end of capacitor 22 is connected to the 1st power supply device
Node between 13 output terminal and light source 30, the other end are connected to the node between inductor 23 and light source 30.
One end of inductor 23 is connect with light source 30, and the other end is connect with the drain terminal of switch element 24.Switch element
24 drain terminal is connect with the other end of inductor 23, and gate terminal is connect with control device 14, and source terminal is via resistance
25 ground connection.
Each light source 30 has a plurality of light-emitting elements 31 being connected in series.One end of each light source 30 and the 1st power supply device
One end of 13 output terminal, the cathode of diode 21 and capacitor 22 connects.The other end and inductor 23 of each light source 30
One end connection.
Light-emitting component 31 in present embodiment is to utilize the load acted from the electric current that the 2nd power supply device 20 supplies
An example.Moreover, in the present embodiment, light-emitting component 31 is, for example, the semiconductor light-emitting elements such as LED.Moreover, as other examples
Son, light-emitting component 31 are also possible to Organic Light Emitting Diode (Organic Light Emitting Diode), inorganic electroluminescence hair
Light (Inorganic Electro Luminescence) light-emitting component or other field emission light-emitting components etc..
When switch 16 is closed, the 1st power supply device 13 turns the voltage of the commercial ac power source 15 received via switch 16
It is changed to DC voltage, and is supplied to each 2nd power supply device 20.Each 2nd power supply device 20 will be supplied from the 1st power supply device 13
Voltage step-down to desired DC voltage, and supply to corresponding light source 30.
Control device 14 supplies the control signal that the conducting of control switch element 24 and disconnection act to each 2nd power supply
Device 20.Specifically, control device 14 to the switch element 24 of each 2nd power supply device 20 by supplying gate pole-source electrode
Between voltage VGSControl is high-caliber control signal, to be conducting by the control of switch element 24, makes to fill from the 1st power supply
Set 13 current direction light source 30 and inductor 23.
By controlling switch element 24 from disconnection to be connected, the electric current I of inductor 23 is flowed throughLIncrease, energy savings exists
In inductor 23.Here, the electric current I that inductor 23 will be flowed through from light source 30 towards 24 direction of switch elementLDirection definition be
Positive direction.
Then, control device 14 will be between gate pole-source electrode by supplying to the switch element 24 of each 2nd power supply device 20
Voltage VGSControlling is low-level control signal, to cutting off the control of switch element 24 to disconnect from the 1st power supply device 13
It is supplied towards the electric current of light source 30 and inductor 23.By controlling switch element 24 from conducting to disconnect, flowed through with positive direction
The electric current I of inductor 23LIt supplies via diode 21 to light source 30, flows through the electric current I of inductor 23LReduce, puts aside in inductor
23 energy is released.
In this way, each 2nd power supply device 20 by carrying out the control signal of self-control device 14, make switch element 24 be connected and
It disconnects, thus works as buck circuit.In addition, control device 14 make each 2nd power supply device 20 with electric current not
Continuous mode operating.
[control time]
Here, the time of the control signal supplied from control device 14 to each switch element 24 is described in detail.
Fig. 4 is the figure for an example for illustrating the control time of the switch element 24 of each 2nd power supply device 20.Such as T during Fig. 4ON
Shown, between gate pole-source electrode of switch element 24 voltage VGSBecome high and carrying out the control signal of self-control device 14
When horizontal, switch element 24 becomes being connected, and the electric current I of inductor 23 is flowed through with positive directionLIncrease, energy is put aside in inductor
23。
Then, such as T during Fig. 4OFFShown, between gate pole-source electrode of switch element 24 voltage VGSBy carrying out automatic control
The control signal of device 14 processed and when becoming low-level, switch element 24 becomes to disconnect, and the electricity of inductor 23 is flowed through with positive direction
Flow ILReduce and become 0, the energy put aside in inductor 23 is released.Then, inductor 23 is flowed through as shown in figure 4, generating
Electric current ILPolarity (electric current ILDirection) the multiple free vibration of switching.
In the present embodiment, control device 14 is in the electric current I for flowing through inductor 23 from generationLFree vibration start through
Cross the predetermined time T and then secondary voltage V supplied between the gate pole-source electrode for making switch element 24 to switch element 24GSBecome high
Switch element 24 is connected in horizontal control signal.
Fig. 5 is for illustrating switch element 24 from control is disconnected for the figure of an example of the time of conducting.As shown in figure 5,
Voltage V between gate pole-source electrode of switch element 24GSBecome low-level and carrying out the control signal of self-control device 14
When, switch element 24 becomes to disconnect, and the electric current I of inductor 23 is flowed through with positive directionLReduce.Then, in moment t1Electric current ILBecome
0, begin to flow through the electric current I of inductor 23LFree vibration.
Flow through the electric current I of inductor 23LWith moment t1For (electric current I after conversion point-polarity reversionLDirection become negative side
To later), in moment t2Again become 0.Then, the electric current I of inductor 23 is flowed throughLWith moment t2It is anti-again for conversion point-polarity
Then return to original polarity (positive direction).Then, if switch element 24 is not turned on, the electric current I of inductor 23 is flowed throughL?
Moment t3Again become 0, with moment t3It is inverted again for conversion point-polarity.Then, it if switch element 24 is not turned on, flows through
The electric current I of inductor 23LPolar reversion is repeated, decays simultaneously.
In this way, flowing through the electric current I of inductor 23 in the case where switch element 24 is gone off from conductingLPolarity exist
Moment t1Carry out the 1st reversion and in moment t2The 2nd reversion is carried out, if switch element 24 is not turned on, in moment t3It carries out
3rd reversion.
In the present embodiment, control device 14 executes following turn-on time control: at the time of by predetermined time T,
By switch element 24 from control is disconnected for conducting, predetermined time T is after switch element 24 is gone off from conducting with pros
To the electric current I for flowing through inductor 23LBecome t at the time of 01Start to generation electric current ILThe 3rd polarity reversion at the time of t3Until
During T0Within.
In addition, since control device 14 is in turn-on time control, in period T0Within by switch element 24 from disconnect control
It is made as being connected, thus, for example as shown in fig. 6, can be from the electric current I for flowing through inductor 23 with positive directionLBecome t at the time of 01
It begins to pass through and generates electric current ILThe 2nd polarity reversion before predetermined time T ' at the time of, by switch element 24 from disconnect control
It is made as being connected.
Here, flowing through the electric current I of inductor 23LPolarity reversion when, generate high-frequency noise.Therefore, inductor is being flowed through
23 electric current ILFree vibration during, electric current ILEach polarity reversion generate high-frequency noise.It can make each 2nd power supply
Device 20 is operated with continuous current mode, but from the viewpoint of easy design etc., in the present embodiment, makes each 2nd
Power supply device 20 is operated using electric current discontinuous mode as premise.Therefore, it is necessary to the electric current I for flowing through inductor 23LSetting is certainly
By during vibrating.
Here, if switch element 24 is flowed through the electric current I of inductor 23 with positive direction from control is disconnected for conductingL
Start to increase.That is, if stream has the electric current I of positive direction before switch element 24 just becomes conductingL, then by switch element 24 from
Disconnection becomes to be connected, and the electric current I of inductor 23 is flowed through with positive directionLStart to increase.On the other hand, if switch element 24 just becomes
Have and square electric current I round about for stream before conductingL, then become to be connected from disconnection by switch element 24, with negative side
To the electric current I for flowing through inductor 23LReduce, electric current ILPolarity reversion, the electric current I flowed through with positive directionLStart to increase.
Thus, for example as shown in fig. 6, if from the electric current I for flowing through inductor 23 with positive directionLBecome t at the time of 01It opens
Begin to t at the time of generating the 2nd polarity reversion2Until during, by switch element 24 from disconnect control for conducting, then with negative side
To the electric current I for flowing through inductor 23LReduce and after polarity reversion, the electric current I that is flowed through with positive directionLStart to increase.It is tied
Fruit flows through the electricity of inductor 23 during until being to disconnect and be again transformed into conducting from ON transitions by switch element 24
Flow ILPolarity invert altogether 2 times.
Moreover, for example as shown in figure 5, if from generate electric current ILThe 2nd polarity reversion at the time of t2Start to generation
T at the time of 3rd polarity reversion3Until during, by switch element 24 from disconnect control for conducting, then due to electric current ILXiang Zheng
Direction flowing, therefore electric current I will not be generated because switch element 24 is changed into conducting from disconnectionLPolarity reversion.Therefore, it is inciting somebody to action
During switch element 24 is until disconnecting and being again transformed into conducting from ON transitions, the electric current I of inductor 23 is flowed throughLPole
Property inverts 2 times altogether.
In this regard, if generating electric current ILThe 3rd polarity reversion at the time of t3After, switch element 24 is controlled from disconnection
It is made as being connected, then flows through the electric current I of inductor 23 with positive directionLIncrease, result generation 4 times or more electric current ILPolarity it is anti-
Turn.Therefore, and from electric current ILBecome t at the time of 01Start to generation electric current ILThe 3rd polarity reversion at the time of t3Until
Switch element 24 is to compare when being connected from control is disconnected by period, electric current ILPolarity reversion number increase, the noise of generation increases
It is more.
In this way, control device 14 in present embodiment passes through from the electric current I for flowing through inductor 23 with positive directionLBecome
T at the time of 01Start to generation electric current ILThe 3rd polarity reversion at the time of t3Until during, by switch element 24 from disconnection
Control is conducting, can enable the 2nd power supply device 20 to press down generated noise while the operating of electric current discontinuous mode
It is made as lower.Time of the lighting device 1 by control by switch element 24 from disconnection control for conducting in present embodiment, energy
It is lower for reaching generated noise suppressed, there is no need to which the noise counter plans element such as inductor or capacitor is arranged, can make to fill
Setting miniaturization or cost reduces.
[relationship between duty ratio and turn-on time]
Control device 14 is supplied pwm signal as control signal to each switch element 24.By control supply to opening
The duty ratio for closing the pwm signal of element 24 can be controlled from the supply of the 2nd power supply device 20 to the electric current of light source 30, can be controlled
The light quantity of light source 30.Here, the pulse width (during high level) of pwm signal is longer in electric current discontinuous mode, electricity is flowed through
The electric current I of sensor 23LMaximum value it is bigger.
Pulse width when Fig. 7 is for illustrating using pwm signal control switch element 24 and by switch element 24 from disconnected
Open the figure of relationship of the control between the time of conducting.In Fig. 7 (a) indicate by it is more than predetermined length (such as design on maximum
Value) electric current I when supplying to switch element 24 of the pwm signal of pulse widthLVariation.(b) is indicated pulse width in Fig. 7
Electric current I when pwm signal less than predetermined length is supplied to switch element 24LVariation.(c) is indicated pulse width in Fig. 7
Electric current I when (b) shorter pwm signal is supplied to switch element 24 in Fig. 7LVariation.
In Fig. 7 shown in (a)~(c), in the pwm signal of fixed frequency, pulse width it is wider (that is, duty ratio (for example (,) with
Pulse spacing T10Between ratio) it is higher), flow through the electric current I of inductor 23LMaximum value it is bigger.For example, by (a) institute in Fig. 7
The pulse width T of the pwm signal shown11The pulse width T of pwm signal shown in (c) in Fig. 715Greatly, (a) institute therefore in Fig. 7
The electric current I shownLMaximum value ratio Fig. 7 in electric current I shown in (c)LMaximum value it is big.
Moreover, electric current ILMaximum value it is bigger, during free vibration in flow through the electric current I of inductor 23LAmplitude get over
Greatly, the noise generated during free vibration increases.For example, the electric current I as shown in (a) in Fig. 7LMaximum value ratio Fig. 7 in
(c) electric current I shown inLMaximum value it is big, therefore T during the free vibration of (a) in Fig. 712Middle electric current ILAmplitude ratio Fig. 7 in
(c) T during free vibration16Middle electric current ILAmplitude it is big.Therefore, when the control signal of the pulse width shown in (a) in Fig. 7
When control switch element 24, if lengthening electric current ILFree vibration during, then with the pulse width shown in (c) in Fig. 7
It is compared when controlling Signal-controlled switch element 24, generated noise becomes larger.
Therefore, control device 14 is predetermined length or more (for example, maximum value in design) in the pulse width of pwm signal
When, i.e., the light quantity of light source 30 be it is predetermined more than light quantity when, preferably from electric current ILBecome t at the time of 01Start to generation the 3rd time
T during until polarity reversion0Interior execute controls the control of switch element 24 for the turn-on time of conducting.
In other words, control device 14 is when the pulse width of pwm signal is predetermined length or more, preferably to switch element 24
Supply executes the pwm signal of the duty ratio of turn-on time control.Thereby, it is possible to will flow through the electric current I of inductor 23LIn free vibration
The noise suppressed generated during dynamic is lower.
In addition, flowing through the electric current I of inductor 23 during free vibrationLVibration period depend on inductor 23 electricity
The circuit constants such as sense, the parasitic capacitance of switch element 24, the stray capacitance of substrate wiring.Therefore, because the deviation of these constants,
Electric current ILVibration period generate deviation, from the electric current I during free vibrationLThe 1st polarity reversion at the time of t1Start to the
T at the time of 3 polarity reversions3Until during can also generate deviation sometimes.Therefore, it in turn-on time control, will preferably open
Pass element 24 is designed as the electric current I during free vibration from the time that disconnection is converted to conductingLThe 2nd polarity reversion at the time of
t2Near.
It, also can be from the electric current I during free vibration even if there are deviations for the circuit constant of substrate or element as a result,L
T at the time of 1st polarity reversion1T at the time of starting to the 3rd polarity to invert3Until in a period of by switch element 24 from disconnection
Control is conducting.
In addition, needing to reduce the duty ratio of pwm signal to reduce the electric current of supply to light source 30.But as in Fig. 7
(a) shown in, when control device 14 adjusts the duty ratio of pwm signal to execute conducting when pulse width is predetermined length or more
Between control.Therefore, if reducing the duty ratio of pwm signal, such as shown in (c) in (b) in Fig. 7 or Fig. 7, inductance is being flowed through
The electric current I of device 23LFree vibration during, electric current ILPolarity invert 3 times it is above after by switch element 24 from control is disconnected be to lead
Lead to and is controlled without turn-on time.
Here, if reducing duty ratio, pulse width shortens in the pwm signal of fixed frequency.If pwm signal
Pulse width shorten, then during free vibration in flow through the electric current I of inductor 23LAmplitude become smaller, therefore in free vibration
The noise that period generates also becomes smaller.Thus, for example such as (b) in Fig. 7 or (c) shown, the pulse width T of pwm signal13Or T15It is small
When predetermined length, the T during free vibration14Or T16The noise of generation will not be excessive.Therefore, even if flowing through inductor
23 electric current ILSwitch element 24 is controlled from disconnection to be connected after progress 3 times or more reversions, by the whole generation of lighting device 1
Noise will not be excessive.
In this way, control device 14 in present embodiment is when the pulse width of pwm signal is less than predetermined length, without
Turn-on time control.Thereby, it is possible to expect processing performed by simplified control device 14 and mitigate processing load.
More than, embodiment is illustrated.
As described above, lighting device 1 according to the present embodiment, the generation for being just able to suppress noise without adding element.
[variation]
In addition, the present invention is not limited solely to above embodiment, various modifications can be carried out in the range of its objective.
For example, in the above-described embodiment, control device 14 executes turn-on time control to all 2nd power supply devices 20,
But the present invention is not limited solely to this, can be at least any one execution turn-on time control in multiple 2nd power supply devices 20.
For example, as shown in figure 3, lighting device 1 has 6 light sources 30, but there may be desired by acquisition in 6 light sources 30
Light quantity and necessary electric current (can be referred to as load current) are greater than the light source of other light sources 30.Control device 14 can be to the 2nd electricity
Source device 20 executes turn-on time control, and the 2nd power supply device 20 is to obtaining desired light quantity and necessary electric current is greater than
The 2nd power supply device 20 that the light source 30 of other light sources 30 is powered.
As a result, compared with when all 2nd power supply devices 20 are executed with turn-on time control, switch element 24 can be dispersed
Control the time, therefore can be avoided because switch element 24 control time-interleaving caused by switching noise increase.
Moreover, in the above-described embodiment, control device 14 utilizes the pwm signal control switch element 24 of fixed frequency
Conducting and disconnection, but the present invention is not limited solely to this.For example, it is wide that control device 14 can use fixed pulse as other way
The conducting and disconnection of the PFM Signal-controlled switch element 24 of degree.When Fig. 8 is for illustrating using PFM Signal-controlled switch element
Pulse spacing and by switch element from disconnect control for conducting time between relationship figure.
(a) is indicated to supply the PFM signal that frequency is predetermined value or more (for example, design on maximum value) to opening in Fig. 8
Close electric current I when element 24LVariation.(b) indicates that the PFM signal that frequency is less than to predetermined value is supplied to switch element in Fig. 8
Electric current I when 24LVariation.When using the conducting and disconnection of the PFM Signal-controlled switch element 24 of fixed pulse width, such as
In Fig. 8 shown in (a), control device 14 supplies the frequency of predetermined value or more to switch element 24 (for example, the pulse spacing is pre- timing
Between T21) in execute turn-on time control pulse width T20PFM signal.Moreover, as shown in (b) in Fig. 8, control device 14
It is less than the frequency of predetermined value (for example, the pulse spacing is predetermined time T to the supply of switch element 2422) in do not execute turn-on time control
The pulse width T of system20PFM signal.Thereby, it is possible to reduce the noise generated from lighting device 1.
More than, several embodiments of the invention are illustrated, but these embodiments are merely illustrative, not
There is the intention for limiting invention scope.These new embodiments can be implemented in a manner of various other, not depart from ancestor of the present invention
In the range of purport, various omissions, displacement, change can be carried out.These embodiments or its deformation all belong to the scope of the present invention or
In objective, and it is also contained in the invention and its equivalent range recorded in technical solution.
Claims (4)
1. a kind of power supply device is operated with electric current discontinuous mode, and the voltage step-down that will be exported from other power supply devices
And supply to loading, which is characterized in that:
At least have: inductor；
Switch element is conducting by operation, by the energy supply from other power supply devices to the inductor, passes through
Operation cuts off supply of the energy from other power supply devices to the inductor, and make savings in the electricity to disconnect
The energy of sensor is released；
Control unit controls the switch element,
When during the switch element being controlled as conducting to be more than specific length, the control unit is first by the switch
Part is after disconnecting, during flowing through the free vibration of electric current of the inductor, to flow through the inductor from conducting control
Electric current polarity switching 1 time after the 2nd switching at the time of near, execute the switch element from control is disconnected to be connected
Turn-on time control.
2. power supply device according to claim 1, it is characterised in that:
The switch element is connected and disconnects according to the pulse width modulation (PWM) signal supplied from the control unit.
3. power supply device according to claim 2, it is characterised in that:
When being less than the specific length during switch element is controlled as conducting, the control unit is by the switch
Element is after disconnecting, during flowing through the free vibration of electric current of the inductor, to flow through the inductance from conducting control
After polarity switching 3 times or more of the electric current of device, by the switch element from control is disconnected at conducting.
4. a kind of lighting device, it is characterised in that:
Have: power supply device described in any one of claims 1 to 3；
It is equipped with the apparatus main body of the power supply device；
Load,
From the light source that the voltage and current that the power supply device supplies is luminous according to the load.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014034452A JP6273896B2 (en) | 2014-02-25 | 2014-02-25 | Power supply device and lighting device |
| JP2014-034452 | 2014-02-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104869687A CN104869687A (en) | 2015-08-26 |
| CN104869687B true CN104869687B (en) | 2018-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410440556.2A Active CN104869687B (en) | 2014-02-25 | 2014-09-01 | Power supply device and lighting device |
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| JP (1) | JP6273896B2 (en) |
| CN (1) | CN104869687B (en) |
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|---|---|---|---|---|
| CN111182676B (en) | 2018-11-08 | 2021-07-09 | 台达电子企业管理（上海）有限公司 | Dimming circuit and dimming control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008109761A (en) * | 2006-10-24 | 2008-05-08 | Fuji Electric Device Technology Co Ltd | Operation mode determination circuit of dc-dc converter |
| JP2011010450A (en) * | 2009-06-25 | 2011-01-13 | Fujitsu Semiconductor Ltd | Semiconductor integrated circuit and power supply apparatus |
| JP2011193549A (en) * | 2010-03-11 | 2011-09-29 | Toyota Motor Corp | Failure detector of chopper circuit |
| JP2013110062A (en) * | 2011-11-24 | 2013-06-06 | Panasonic Corp | Led driving device, illuminating device and illumination apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3720772B2 (en) * | 2002-01-31 | 2005-11-30 | キヤノン株式会社 | Current determination circuit and image recording apparatus having current determination circuit |
| JP4915162B2 (en) * | 2006-07-25 | 2012-04-11 | 富士電機株式会社 | DC-DC converter |
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2014
- 2014-02-25 JP JP2014034452A patent/JP6273896B2/en active Active
- 2014-09-01 CN CN201410440556.2A patent/CN104869687B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008109761A (en) * | 2006-10-24 | 2008-05-08 | Fuji Electric Device Technology Co Ltd | Operation mode determination circuit of dc-dc converter |
| JP2011010450A (en) * | 2009-06-25 | 2011-01-13 | Fujitsu Semiconductor Ltd | Semiconductor integrated circuit and power supply apparatus |
| JP2011193549A (en) * | 2010-03-11 | 2011-09-29 | Toyota Motor Corp | Failure detector of chopper circuit |
| JP2013110062A (en) * | 2011-11-24 | 2013-06-06 | Panasonic Corp | Led driving device, illuminating device and illumination apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015159695A (en) | 2015-09-03 |
| JP6273896B2 (en) | 2018-02-07 |
| CN104869687A (en) | 2015-08-26 |
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