CN102316627B - Led lighting device - Google Patents
Led lighting device Download PDFInfo
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- CN102316627B CN102316627B CN201110040927.4A CN201110040927A CN102316627B CN 102316627 B CN102316627 B CN 102316627B CN 201110040927 A CN201110040927 A CN 201110040927A CN 102316627 B CN102316627 B CN 102316627B
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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
The invention discloses an LED lighting device, which has the overheat protection function, by which the power is lowered when the ambient temperature is high and the service lifetime of an LED and the lighting device is prevented from being shortened. The LED lighting device comprises a power conversion circuit for converting the power supplied by a power source and then supplying the power to a light-emitting diode; and a control circuit for driving a switch element of the power conversion circuit. The LED lighting device is characterized in that the control circuit has a first temperature-sensitive circuit with a temperature-sensitive element, and a turn-off time-variable circuit which determines the turn-off time of the switch element based on the output of the first temperature-sensitive circuit.
Description
Technical field
The present invention relates to the ignition device of light-emitting diode (being designated as LED below).
Background technology
LED is concerned as the light source being conducive to environment, and it to be used in some the back of the body lamp etc. on a large scale in product of illumination, the room light of automobile or headlight, annunciator, liquid crystal display.In addition, in the general lighting towards house or office building, the displacement from existing light sources such as fluorescent lamps to LED has been started
The light output of LED is decided by the electric current flow through in the led (following, to be designated as LED current).Therefore, expect that LED point lamp device has by LED current being controlled as constant thus control the light output of LED for constant function.
As the LED point lamp device possessing such function, there is the device recorded in such as patent documentation 1.Same device is the structure of powering to LED via buck chopper from DC power supply, possessing the self-excitation type drive circuit making switching elements ON/disconnection, is constant and buck chopper action under electric current critical conduction mode to make the peak value of the electric current flow through in the switch element of buck chopper.Thus, LED current is controlled as constant, and then, owing to producing the conduction losses of switch element hardly, so high efficiency can be realized when power transfer.
Patent documentation 1: Japanese Unexamined Patent Publication 2005-294063 publication
Summary of the invention
LED when luminescence along with heating.In addition, under many circumstances, LED point lamp device is configured in the framework of the vicinity of the LED airtight space such as inner.Therefore, if LED current does not control as constant according to environment temperature by LED point lamp device, when temperature is high temperature so around, the temperature of LED and LED point lamp device (below, also comprise LED and be designated as LED point lamp device) just becomes considerably high, just there is its life-span short problem.In addition, environment temperature is the temperature of the extraneous air contacted in LED product as described above, and in addition, when by when installing the utensil of LED product or wall sealing LED product, the temperature in airtight space is exactly environment temperature.
In order to solve the problem, expect following LED point lamp device, it has possessed overheat protective function, and this overheat protective function makes the power of LED point lamp device reduce when temperature is high temperature around, suppresses the temperature of LED point lamp device to rise lower.
According to LED point lamp device of the present invention, because the power of LED point lamp device reduces when temperature is high temperature around, suppress the temperature of LED point lamp device to rise lower, just can avoid the short service life of LED and ignition device.
Accompanying drawing explanation
Fig. 1 is the block diagram of the LED point lamp device in the 1st execution mode of the present invention.
Fig. 2 is the structure of the LED point lamp device in the 1st execution mode of the present invention.
Fig. 3 is the structure of the 1st temperature-sensitive circuit in the 1st execution mode of the present invention.
Fig. 4 is the temperature characterisitic of the LED point lamp device in the 1st execution mode of the present invention.
Fig. 5 is the action waveforms of the LED point lamp device in the 1st execution mode of the present invention.
Fig. 6 is the structure of the LED point lamp device in the 1st execution mode of the present invention.
Fig. 7 is the structure of the 1st temperature-sensitive circuit in the 1st execution mode of the present invention.
Fig. 8 is the structure of the 1st temperature-sensitive circuit in the 1st execution mode of the present invention.
Fig. 9 is the structure of the LED point lamp device in the 1st execution mode of the present invention.
Figure 10 is the block diagram of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 11 is the structure of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 12 is the structure of the 2nd temperature-sensitive circuit in the 2nd execution mode of the present invention.
Figure 13 is the temperature characterisitic of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 14 is the action waveforms of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 15 is the temperature characterisitic of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 16 is the action waveforms of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 17 is the structure of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 18 is the mounting means of the temperature-sensing element of LED point lamp device of the present invention.
Figure 19 is the mounting means of the temperature-sensing element of LED point lamp device of the present invention.
Figure 20 is the structure of the LED point lamp device in the 2nd execution mode of the present invention.
Figure 21 is the structure of the LED point lamp device in the 1st execution mode of the present invention.
Embodiment
With accompanying drawing, embodiments of the present invention are described.
< the 1st execution mode >
Fig. 1 is the block diagram of the LED point lamp device in the 1st execution mode of the present invention.The electric power supplied from power supply 100 is converted by the power transformation circuit 103 possessing switch element by LED point lamp device, powers to LED load 104.Here, power supply 100 comprises and the AC power supplied from outside is carried out through AD-DC translation circuit converting the DC power supply obtained.About LED load 104, do not limit number and the connected mode of LED, in addition, the LED module that also can comprise protection element etc. built-in.
LED point lamp device possesses the control circuit 105 for controlling power transformation circuit 103.In control circuit 105, disconnect (off) time adjusted circuit 107 based on the output of the 1st temperature-sensitive circuit 109 possessing temperature-sensing element, make the opening time of switch element variable.In addition, turn-on time, adjusted circuit 108 was based on the electric current of the power transformation circuit 103 detected, made the turn-on time of switch element variable.The opening time that drive circuit 106 determines according to adjusted circuit 107 opening time and the turn-on time that turn-on time, adjusted circuit 108 determined, drive the switch element of power transformation circuit 103.
In addition, opening time, adjusted circuit 107 also can be the frequency variable circuit making the switching frequency of switch element variable.But, due to opening time adjusted circuit and frequency variable circuit in, the action of the LED point lamp device obtained as a result is identical, is designated as adjusted circuit opening time so unified in the following description and figure.
Fig. 2 is the structure of the LED point lamp device in the 1st execution mode of the present invention.In fig. 2, the DC power supply that the full-wave rectifying circuit formed by the AC power 101 supplied from outside, diode bridge 110, electric capacity 111 are formed is equivalent to the power supply 100 of Fig. 1.In addition, the buck chopper be made up of diode 112, switch element and power field effect transistor (Power MOSFET) 113, choke 114, electric capacity 115 is equivalent to the power transformation circuit 103 of Fig. 1.The electric current of current detecting unit 116 detection power field-effect transistor 113 also feeds back to adjusted circuit 108 turn-on time.
In fig. 2, also power field effect transistor 113 can be replaced and the switch element of other kinds using bipolar transistor such.Also can replace full-wave rectifying circuit and use a times voltage rectifying circuit.Also can replace buck chopper and use buck-boost chopper etc. all chopper circuit, possess the power transformation circuit of other modes such as various converter circuits of the such transformer of flyback converter.The use of electric capacity 111 and 115 is arbitrary.Also the noise reply parts such as circuit protection parts, electric capacity or the chokes such as fuse can be added.In addition, these replacement schemes and additional project can be applied to all of the embodiments of the present invention.
In fig. 2, by resistance 117, as the concatermer of the temperature sensitive resister of temperature-sensing element and PTC thermistor 118, electric capacity 119 and the RC circuit be connected with voltage source 120 formed is equivalent in FIG the 1st temperature-sensitive circuit 109.In addition, above-mentioned temperature sensitive resister means the resistive element of resistance change according to temperature that thermistor is such.The voltage of electric capacity 119 is equivalent to the output of the 1st temperature-sensitive circuit 109 in Fig. 1, is imported in adjusted circuit 107 opening time.As the structure of RC circuit, it also can be Fig. 3 (a) structure that resistance 117 is in parallel with PTC thermistor 118 like this.In addition, as temperature-sensing element, except temperature sensitive resister, the electric capacity (being designated as temperature-sensitive electric capacity below) of the static capacity change according to temperature can also be used.Such as, if laminated ceramic capacitors, then X7R kind etc. can be used as temperature-sensitive electric capacity.In this case, the temperature-sensitive circuit comprising temperature-sensitive electric capacity 140 can be formed as Suo Shi Fig. 3 (b).The number of resistance, temperature-sensing element, electric capacity and connected mode are arbitrary, particularly, when using temperature sensitive resister as temperature-sensing element, the use of resistance is arbitrary, when using temperature-sensitive electric capacity as temperature-sensing element, the use of electric capacity is arbitrary.In addition, about voltage source 120, omit in FIG, in addition, constantly occur in the following description.The generation unit of potential source 120 although do not ration the power supply, such as, can export to generate via adjuster from the direct current of full-wave rectifying circuit.
Opening time, adjusted circuit 107 was configured to: at power field effect transistor 113 for during on-state, make the voltage of electric capacity 119 be roughly 0 forcibly, from the moment that power field effect transistor 113 is disconnected, charged by voltage source 120 pairs of electric capacity 119.
In addition, although the situation voltage of electric capacity 119 being recited as roughly zero normally voltage be the situation of 0, also have consider when adding noise, how many bucking voltage be 0 situation.
If start charging, the voltage of electric capacity 119 rises according to RC time constant, and this RC time constant is decided by resistance 117 and the resistance value of PTC thermistor 118 and the static capacity of electric capacity 119.The moment that opening time, adjusted circuit 107 reached the set point of expectation at the voltage of electric capacity 119 makes power field effect transistor 113 connect.Therefore, the opening time of power field effect transistor 113 is managed by RC time constant, and RC time constant is larger, then opening time is longer.About the adjusted circuit 107 opening time of as above the same action, although do not limit concrete structure, can be made up of key elements such as comparator, switch element, reference voltage sources.
The resistance value of PTC thermistor 118 changes for its temperature as figure 4.In addition, in the diagram, although be represented by dotted lines the relation of the power of LED point lamp device and the temperature of PTC thermistor 118, this has been described later.Usually, in PTC thermistor, when the low temperature lower than certain temperature (Tc of Fig. 4), although resistance value does not rely on temperature and constant, but when the high temperature higher than certain temperature (Tc of Fig. 4), while temperature rises, resistance value increases sharp.In the following description, the environment temperature when temperature of PTC thermistor 118 being become Tc is defined as the 1st fiducial temperature.Around temperature be the low temperature lower than the 1st fiducial temperature or high temperature time, PTC thermistor 118 becomes temperature Ta such as shown in Fig. 4 or Tb.
When temperature is low temperature (simple be below designated as low temperature) than the 1st fiducial temperature around, it is constant that the resistance value of PTC thermistor 118 does not rely on temperature, and above-mentioned RC time constant is along with also becoming less constant opening time.On the other hand, time temperature is higher than the 1st fiducial temperature around high temperature (simple be below designated as high temperature), because the resistance value of the higher then PTC thermistor 118 of environment temperature increases, so above-mentioned RC time constant is along with also increasing opening time.About whether the 1st fiducial temperature being set as how many degree, depending on the specification (particularly power and structure) of LED product, selecting the PTC thermistor with best temperature characterisitic according to this specification.
If power field effect transistor 113 is connected, then in power field effect transistor 113, electric current starts flowing, and this electric current increases along with the time under main points described later.Turn-on time, adjusted circuit 108 was by the electric current of current detecting unit 116 detection power field-effect transistor 113, and the moment reaching the set point of expectation at the electric current of power field effect transistor 113 makes power field effect transistor 113 disconnect.For the adjusted circuit 108 turn-on time of above action like this, do not limit concrete structure, can be made up of the key element such as comparator, reference voltage source.
Above result, temperature is low temperature or high temperature around, the temperature of PTC thermistor 118 is when being such as Ta or Tb of Fig. 4, and the action waveforms of the electric current (IQ) of the ON/OFF state (SW) of power field effect transistor 113, the voltage (VC) of electric capacity 119, power field effect transistor 113 becomes Fig. 5 (a) or Fig. 5 (b) respectively.Illustrate the waveform of the electric current (ID) of diode 112, the electric current (IL) of choke 114, the electric current (ILED) of LED load 104 in Figure 5 in the lump.In addition, assuming that the static capacity of electric capacity 115 is very large, ILED becomes the flip-flop of IL.
Fig. 5 is used to carry out the action of briefly bright buck chopper.First, when power field effect transistor 113 is connected, electric current flows to buck chopper with the path of the doublet of LED load 104 and electric capacity 115, choke 114, power field effect transistor 113, current detecting unit 116.As the same in the waveform of 1Q with IL of Fig. 5, this electric current increased point-blank along with the time, and its gradient is decided by the voltage of power supply 100, the voltage of LED load 104, the autonomous induction coefficient of choke 114.Turn-on time, adjusted circuit 108 was according to above-mentioned, and the moment reaching the set point of expectation at this electric current makes power field effect transistor 113 disconnect.
If power field effect transistor 113 becomes disconnection, then the electric current of buck chopper changes path, in the path of the also disjunctor of choke 114, diode 112, LED load 104 and electric capacity 115, flow through electric current.As the same in ID with the IL waveform of Fig. 5, this electric current reduced point-blank along with the time, and its gradient is decided by the voltage of LED load 104 and the autonomous induction coefficient of choke 114.Here, the voltage due to LED load 104 is the voltage of the constant decided by the number of LED and/or connected mode, so the gradient of electric current I D and IL also may be thought of as constant.Opening time, adjusted circuit 107 determined opening time in above-mentioned main points, from being switched to the moment that have passed through this opening time, power field effect transistor 113 was disconnected again.From the waveform of IL and ILED of Fig. 5, by controlling opening time as constant, just the flip-flop of IL and ILED can be controlled as constant.
When low temperature, be constant because opening time does not rely on temperature, thus action waveforms from the state of Fig. 5 (a) not according to variations in temperature, ILED does not rely on temperature yet and is controlled as constant.Accordingly, as shown in Figure 4, the power of LED point lamp device does not rely on temperature yet, becomes constant.In addition, as shown in Fig. 5 (a), if the time making IL or ID reduce to 0 is consistent with opening time, then buck chopper action under electric current critical conduction mode.Now, owing to not producing the connection loss of power field effect transistor 113, just improve the conversion efficiency of buck chopper.But the control mode of buck chopper is not limited thereto, its action under current continuity or discontinuous mode when low temperature also can be made.
If become high temperature from low temperature, because the opening time of power field effect transistor 113 is elongated, so action waveforms is from Fig. 5 (a) phase Fig. 5 (b) change, flip-flop and the ILED of IL diminish.The power of the degree reduced with ILED correspondingly LED point lamp device also reduces, temperature reduction compared with the situation not making power reduce of LED point lamp device.Accordingly, the short service life of LED and LED point lamp device can just be avoided.In addition, when high temperature, due to temperature, more Gao Ze is longer for opening time, and as shown in Figure 4, the power of temperature higher LED point lamp device is less.
LED point lamp device in 1st execution mode can use the driving IC of market sale, if such as utilize LED driving IC and the LC5200 series of three willing Electric Co., Ltd (www.sanken-ele.co.jp), just can the LED point lamp device shown in pie graph 6.The part and switch element that eliminate the 1st temperature-sensitive circuit is built-in with in control circuit in driving IC121.Due to the input pin that PWM pin is to adjusted circuit opening time, Reg pin is the output of voltage source, so contact resistance 117, PTC thermistor 118, electric capacity 119 as just like in figure 6.Detected by the detection resistance 122 be arranged in Sen pin being built in the electric current flow through in the switch element of driving IC121.In addition, being built in the turn-on time of driving IC121 in adjusted circuit, from the bleeder circuit be made up of resistance 123 and 124 to generate the set point of electric current, Ref pin can be input to.
The installation of temperature-sensing element is described.LED point lamp device described above is circuit, and each parts of LED point lamp device are arranged on circuit substrate.But, LED load 104 is arranged on the situation that other substrate (be below designated as LED-baseplate) different from circuit substrate is upper, circuit substrate carries out being electrically connected with electric wire etc. with LED-baseplate more.In LED point lamp device, there are switch element or LED load as parts heat being forced to that have strict service condition, that overtemperature protection should be become object.About these parts, the situation having conclusivelyed show SC service ceiling temperature is more, such as, in most of switch element, is necessary the temperature in node portion to remain on less than 150 DEG C.Therefore, it is effective for configuring temperature-sensing element for the selected grade of temperature-sensing element, the design of temperature-sensitive circuit in the position of the temperature easily detecting these parts.
Figure 18 (a) ~ Figure 18 (d) is the LED point lamp device about Fig. 2, and circuit substrate 300 is installed profile when switch element and power field effect transistor 113 and temperature-sensing element and PTC thermistor 118.Assuming that power field effect transistor 113 is that TO-220 encapsulates such pin parts, in Figure 18 (b), Figure 18 (d), power field effect transistor 113 is that DPAK encapsulates such face installing component in Figure 18 (a), Figure 18 (c), in addition, in whole figure of Figure 18 (a) ~ Figure 18 (d), PTC thermistor 118 is face installing components.In Figure 18 (a), in the resin-encapsulated of power field effect transistor 113 and circuit substrate 300, sandwich PTC thermistor 118, power field effect transistor 113 is contacted with PTC thermistor 118.Thus, PTC thermistor 118 is with regard to the temperature of energy direct-detection power field effect transistor 113.
Expose from the resin-encapsulated portion of power field effect transistor at electrode, when needing the insulation guaranteeing power field effect transistor 113 and PTC thermistor 118, can only sandwich insulation sheet betwixt.In Figure 18 (b), adjoined by the resin-encapsulated portion and PTC thermistor 118 being configured to power field effect transistor 113, power field effect transistor 113 is contacted with PTC thermistor 118.In addition, as Figure 18 (c), Figure 18 (d), under the state only accompanying circuit substrate betwixt, also consider there is the method that the resin-encapsulated of power field effect transistor 113 is contacted with PTC thermistor 118.
Installation shown in Figure 18 (a) ~ Figure 18 (d) also can be applicable to use the situation of the driving IC121 being built-in with switch element as the LED point lamp device of Fig. 6.Figure 18 (e), Figure 18 (f) are one examples, assuming that driving IC121 is the situation that DIP encapsulates such pin parts in Figure 18 (e), in Figure 18 (f), driving IC121 is the situation that SOP encapsulates such face installing component.About the detailed content of installing, due to identical with the situation of Figure 18 (d) ~ Figure 18 (d), so omit the description.Here, as Figure 18 (e), by configuring PTC thermistor 118 near the electrode pin of driving IC121, PTC thermistor 118 is by being just easier to the temperature of detection power field-effect transistor 113 from the heat release of same pin.This LED point lamp device as Fig. 6 is the same, effective especially when PTC thermistor 118 is electrically connected with any one electrode pin of driving IC121.In this case, the electrode pins contact of PTC thermistor 118 and driving IC121 can be made.
Figure 19 (a), Figure 19 (b) are the LED point lamp devices about Fig. 2 etc., temperature-sensing element and PTC thermistor 118 are arranged on profile during LED-baseplate 301.In same figure, although supposition installs the LED module of multiple big gun ball shape as LED load 104, do not limit shape and the number of LED module.Although installed PTC thermistor 118 on the face relative with LED load 104 in Figure 19 (a) on the face identical with LED load 104, in Figure 19 (b), but in any one mode, PTC thermistor 118 all easily detects the temperature of LED load 104.
In addition, the mounting means of temperature-sensing element described above goes for all execution modes of following explanation.
Another example > of < the 1st execution mode
Another example of 1st execution mode is described.First, the example beyond Fig. 2 and Fig. 3 represents is listed for another example of the 1st temperature-sensitive circuit.In the temperature-sensitive circuit that Fig. 2 and Fig. 2 illustrates, the temperature-sensing elements such as PTC thermistor are included in RC circuit.On the other hand, the example be not included in RC circuit as temperature-sensing element such as has the temperature-sensitive circuit shown in Fig. 7 (a), Fig. 7 (b) He Fig. 8.
In the temperature-sensitive circuit of Fig. 7 (a), there is the RC circuit power circuit using the voltage of shunt regulator 125 pairs of voltage sources 120 to convert, in the resistor voltage divider circuit be connected with the set point pin of shunt regulator 125, comprise temperature-sensing element and PTC thermistor 129.The output of power circuit of RC circuit is connected with the RC circuit be made up of resistance 117 and electric capacity 119.The voltage of electric capacity 119 as temperature-sensitive circuit output and 107 to be connected with adjusted circuit opening time.In addition, Fig. 7 (b) is the example using PTC thermistor 129 but use NTC thermistor 130, and its action is constant compared with Fig. 7 (a).In addition, in Fig. 7 (b), can NTC thermistor be replaced and use CTR thermistor.For RC circuit power circuit, if possess temperature-sensing element, the effect of variable output voltage is identical according to temperature, then do not limit concrete structure.In addition, in Fig. 7 (a), Fig. 7 (b), although be connected to RC circuit power circuit on voltage source 120, the output of power supply 100 can be also directly connected to.
In Fig. 7 (a), Fig. 7 (b) commonly, if when high temperature the resistance change of thermistor, the current potential of the set point pin of shunt regulator 125 rises, and the output voltage of RC circuit power circuit declines.Now, owing to being applied to the voltage step-down on RC circuit, so it is elongated to reach time of set point to the voltage of electric capacity 119 from power field effect transistor 113 disconnects, the effect of the opening time extending power field effect transistor 113 can be obtained.
In the temperature-sensitive circuit of Fig. 8, as resistance 117, electric capacity 119, electric capacity 135 concatermer and the RC circuit that forms is connected on voltage source, auxiliary switch element and transistor 134 are connected in parallel with electric capacity 135.As the associated drive circuitry of the ON/OFF state for controlling transistor 134, the base stage of transistor 134 is connected with the resistor voltage divider circuit possessing temperature-sensing element and PTC thermistor 133.The voltage of electric capacity 119 is connected on adjusted circuit 107 opening time as the output of temperature-sensitive circuit.Although omit detailed description and figure, under the main points identical with the example shown in Fig. 7, also can replace PTC thermistor and use NTC thermistor or CTR thermistor.
If the resistance value of PTC thermistor 133 increases when high temperature, then transistor 134 is connected.In the electric capacity 119 and 135 be connected in series, by short circuit between the terminal of electric capacity 135, the joint capacity of electric capacity 119 and 135 increases.Thus, the RC time constant of RC circuit increases, and can obtain the effect of the opening time extending power field effect transistor 113.As another example of this mode, when being connected in series 2 resistance in RC circuit, also one of them resistance can be connected in parallel with switch element.In this case, when forming the bleeder circuit that comprises temperature-sensing element to make high temperature, switch element becomes disconnection.Thus, when high temperature, the resistance value of RC circuit increases, and it is elongated that RC time constant increases opening time.
As another above example, if possess temperature-sensing element, outputted to by the signal being used for the opening time extending power field effect transistor 113 when high temperature in adjusted circuit 107 opening time, then no matter the temperature-sensitive circuit of which kind of structure can.
By only external resistance on driving IC, the opening time of switch element just can be changed.Then, illustrate such driving IC application the 1st execution mode of the present invention.Such as, if use the LED of superfamily (Supertex) company of the U.S. to drive with IC and HV9910B, LED point lamp device as shown in Figure 9 can just be formed.In fig .9, in driving IC136, be built-in with adjusted circuit and constant voltage source opening time, RT pin is the input pin to adjusted circuit opening time, and VDD pin is the output pin of constant voltage source.Opening time, adjusted circuit possessed oscillating circuit therein, connected to make power field effect transistor 113 with the frequency of the constant determined by the resistance value of the resistance circuit being connected to RT pin.Particularly, the larger then frequency of resistance value is elongated for opening time that is lower, power field effect transistor 113.Therefore, if resistance 137 is connected for temperature-sensitive circuit with the concatermer of temperature sensitive resister and PTC thermistor 138 as Fig. 9, then the resistance value of PTC thermistor 138 can increases, extend opening time when high temperature.In addition, about temperature-sensitive circuit, the number of resistance of not rationing the power supply and connected mode.
By only external electric capacity on driving IC, just opening time can be changed.In this case, the condenser network possessing temperature-sensitive electric capacity and any electric capacity can be connected, using as temperature-sensitive circuit.
Finally, as another example of the LED point lamp device shown in Fig. 2, the LED point lamp device of Figure 21 is described.In figure 21, apply ancillary coil 141 at choke 114 place, applied the circuit achieving electric current critical conduction mode by ancillary coil 141.Connect by resistance 117, the RC circuit that forms as the concatermer of the temperature sensitive resister of temperature-sensing element and PTC thermistor 118, electric capacity 119 between the terminal of ancillary coil 141, using as temperature-sensitive circuit.The voltage of electric capacity 119 as temperature-sensitive circuit output and be connected on adjusted circuit 107 opening time.
Under the state that power field effect transistor 113 is off, if the electric current flow through in power field effect transistor 113 is 0, the polarity of the voltage so produced in ancillary coil 141 is then reversed, opening time, adjusted circuit 107 possessed comparator circuit in inside, in the moment of reversion voltage being detected, power field effect transistor 113 was connected.Here, by arranging RC circuit as Figure 21, just can be postponed the time determined by the RC time constant of RC circuit the moment that adjusted circuit 107 opening time detects the reversion of voltage.If the resistance value of PTC thermistor 118 increases when high temperature, then RC time constant increases, and opening time is elongated.
< the 2nd execution mode >
2nd execution mode of the present invention described below, then omits the description for the identical point with the 1st execution mode.
Figure 10 is the block diagram of the LED point lamp device in the 2nd execution mode of the present invention.In control circuit 205, turn-on time, adjusted circuit 208 was not only according to the electric current of detected power transformation circuit 103, also according to the output of the 2nd temperature-sensitive circuit 209 possessing temperature-sensing element, change the turn-on time of switch element.That is, for opening time adjusted circuit 107 and turn-on time adjusted circuit 208 both, possess different temperature-sensitive circuits 109 and 209 respectively.In addition, identical with the 1st execution mode shown in Fig. 1.
Figure 11 is the structure of the LED point lamp device in the 2nd execution mode of the present invention.In fig. 11, by resistance 223 with 224 and as the temperature sensitive resister of temperature-sensing element, i.e. PTC thermistor 225 concatermer and the resistor voltage divider circuit be connected with voltage source 120 formed is equivalent to the 2nd temperature-sensitive circuit 209 in Figure 10.The voltage of resistance 224 is equivalent to the output of the 2nd temperature-sensitive circuit 209 in Figure 10, is imported in adjusted circuit 208 turn-on time as the output valve of electric current.Here, number and its connected mode of the resistance forming resistor voltage divider circuit is not limit.In addition, the NTC thermistor that when also can replace PTC thermistor 225 and be used in high temperature, resistance value reduces or CTR thermistor are to form the such resistor voltage divider circuit of Figure 12.In addition, also can unfavorable resistor voltage divider circuit and utilize capacitance partial pressure circuit, in this case, use temperature-sensitive electric capacity to replace temperature sensitive resister.
Turn-on time, adjusted circuit 208 was the same with the 1st execution mode, and the moment reaching set point at the electric current of power field effect transistor 113 makes power field effect transistor 113 disconnect.The set point of electric current is decided by the voltage ratio of resistor voltage divider circuit, and in the following description, consider that the voltage of resistance 224 is higher, then the set point of electric current just increases.Can comparator be used and form the adjusted circuit 208 turn-on time of such action simply.In addition, opening time, adjusted circuit 107 carried out action in a same manner as in the first embodiment, the structure of connected 1st temperature-sensitive circuit can be described above any one.
As in fig. 13, illustrate that the resistance value of PTC thermistor 118 and 225 has the situation of identical temperature characterisitic.In fig. 13, be represented by dotted lines the relation of the power of ignition device in the 2nd execution mode and the temperature of PTC thermistor, in addition, the also overlapping identical relation illustrating the 1st execution mode shown in Fig. 4.In fig. 13, the definition of temperature Ta, Tb, Tc is identical with Fig. 4.In addition, for convenience of description, assuming that PTC thermistor 118 is substantially identical with the temperature of 225.Temperature is (following compared to the low temperature of above-mentioned 1st fiducial temperature around, singly be designated as low temperature) time, the resistance value of PTC thermistor 118 and 225 does not rely on temperature and is constant, determines the RC time constant of opening time, determines that the set point of the electric current of turn-on time is also constant.When temperature is high temperature (following, be singly designated as high temperature) higher than above-mentioned 1st fiducial temperature around, temperature is higher, then the resistance value of PTC thermistor 118 and 225 is larger.Thus, temperature higher RC time constant is larger, and in addition, the set point of electric current diminishes.
Environment temperature is low temperature or high temperature, represents action waveforms when PTC thermistor is Ta or Tb of such as Figure 13 respectively in Figure 14 (a) or Figure 14 (b).Below, the action waveforms when the low temperature of Figure 14 (a) is identical with Fig. 5 (a).When becoming high temperature from low temperature, although in Fig. 5 (b) only the opening time of power field effect transistor 113 elongated, in Figure 14 (b), in addition the set point of IQ diminishes.Its result, the flip-flop of IL and ILED further minimizing compared with the situation of the 1st execution mode, LED point lamp rating of set also reduces further compared with the 1st execution mode.According to more than, as in fig. 13, in the 2nd execution mode compared with the 1st execution mode, power can be made to reduce the gradient risen relative to temperature steeper, avoiding short service life to reduce the temperature of LED point lamp device, being sometimes necessary to reduce power sharp, so comparatively effective.
Then, as Figure 15, the situation that PTC thermistor 118 and 225 has different temperature characterisitics is described.Particularly, in PTC thermistor 225, compared with PTC thermistor 118, it is the situation that resistance value starts to increase temperature rising.The temperature that the temperature resistance value of PTC thermistor being started rise for PTC thermistor 118 is defined as Tc in a same manner as in the first embodiment, the resistance value of PTC thermistor started to rise for PTC thermistor 225 is defined as Tc '.Now, according to previous explanation Tc ' > Tc.In the following description, the environment temperature when temperature of PTC thermistor 225 being become Tc ' is defined as the 2nd fiducial temperature.Certainly, the 2nd fiducial temperature is the high temperature higher than the 1st fiducial temperature.When temperature is the high temperature higher than the 2nd fiducial temperature around, the temperature of PTC thermistor becomes the Tb ' in such as Figure 15.
When temperature is the low temperature lower than the 1st fiducial temperature around, the resistance value of PTC thermistor 118 and 225 does not rely on temperature and is constant, and the set point of RC time constant and electric current is also constant.For the high temperature higher than the 1st fiducial temperature and be the low temperature lower than the 2nd fiducial temperature time, although the resistance value of the higher then PTC thermistor 118 of temperature is larger, the resistance value of PTC thermistor 225 does not rely on temperature and is constant.Therefore, RC time constant increases with the rising of temperature, and the set point of electric current does not rely on temperature and is constant.When being the high temperature compared to the 2nd fiducial temperature, because the resistance value of the higher then PTC thermistor of temperature 118 and 225 is larger, so the higher RC time constant of temperature becomes large, in addition, the set point of electric current diminishes.
The action waveforms that Figure 16 (a) is environment temperature when being the low temperature lower than the 1st fiducial temperature, Figure 16 (b) to be environment temperature be the high temperature higher than the 1st fiducial temperature and the low temperature low compared to the 2nd fiducial temperature time action waveforms, action waveforms during Figure 16 (b ') high temperature that to be environment temperature be compared to the 2nd fiducial temperature, the definition of the longitudinal axis is identical with the action waveforms represented in Fig. 5 or Figure 14.Below, the state list of Figure 16 (a), Figure 16 (b), Figure 16 (b ') is designated as low temperature, high temperature, superhigh temperature.In figure 16, when becoming (b) high temperature from (a) low temperature, in the same manner as the 1st execution mode that Fig. 5 represents, the opening time of power field effect transistor 113 is elongated.Its result, the power of LED point lamp device reduces in a same manner as in the first embodiment.Then, becoming from (b) high temperature during (b ') superhigh temperature, opening time is elongated further, and the set point of IQ diminishes in addition.Its result, the power of ILED and LED point lamp device sharply reduces.According to above-mentioned, as Figure 15, when for the situation of the low temperature lower than the 2nd fiducial temperature and high temperature, the gradient that power reduction rises relative to temperature can be changed, can under powered gradient be made when superhigh temperature steeper.
In addition, the execution mode using Figure 13 and Figure 14 to illustrate can be described as the 1st fiducial temperature situation equal with the 2nd fiducial temperature.In addition, although omit detailed description, the execution mode that the 2nd fiducial temperature is lower than the 1st fiducial temperature is also considered.
The ignition device that three LED driving IC and the LC5200 series of agreeing Electric Co., Ltd's product are formed in the 2nd execution mode as Figure 17 can be utilized.Be built-in with in driving IC121 in control circuit except the part of the 1st temperature-sensitive circuit and the 2nd temperature-sensitive circuit and switch element.Although eliminate detailed description, the bleeder circuit comprising temperature-sensing element can be connected to the Ref pin of the set point for input current.In fig. 17, using this bleeder circuit as the resistor voltage divider circuit be made up of resistance 223 and 224, PTC thermistor 225.In addition, in fig. 17, the circuit of the power transformation circuit 103 be equivalent in Figure 10 is configured to buck-boost chopper.In addition, add resistance 405, this resistance 405 and, fuse 400, for tackle noise electric capacity 401,403,404, for tackling the choke 402 of noise, LED load 104 is connected in parallel.
Finally, as another example of the 2nd execution mode, represent and consider that the current detecting unit 116 in Figure 11 can become a part for the 2nd temperature-sensitive circuit, in current detecting unit, possess temperature-sensing element.In the LED point lamp device of Figure 20, carried out the electric current of detection power field-effect transistor 113 by the resistance circuit be made up of resistance 122 and temperature sensitive resister and PTC thermistor 227.That is, the resistance circuit for the electric current of detection power field-effect transistor 113 becomes the 2nd temperature-sensitive circuit.
When high temperature, the resistance value of PTC thermistor 227 increases compared with during low temperature, and the combined resistance of resistance 122 and PTC thermistor 227 also increases.If the electric current of power field effect transistor 113 is identical, the current detection value being fed back to adjusted circuit 208 turn-on time when high temperature becomes large.Therefore, when high temperature, at the electric current of power field effect transistor 113 under less state, adjusted circuit 208 was regarded same electric current as and was reached set point turn-on time.In other words, when high temperature, the set point of electric current reduces, and can obtain the action waveforms same with Figure 14 as a result.
In addition, not limitting the concrete structure of temperature-sensitive circuit, such as, also can be that resistance 122 and PTC thermistor 227 are connected in series.
Description of symbols
100... DC power supply
101... AC power
103... power transformation circuit
104...LED load
105... control circuit
205... control circuit
106... drive circuit
107... opening time adjusted circuit
108... turn-on time adjusted circuit
208 turn-on time adjusted circuit
109... temperature-sensitive circuit
209... temperature-sensitive circuit
110... diode bridge
111... electric capacity
115... electric capacity
119... electric capacity
135... electric capacity
139... electric capacity
401... electric capacity
403... electric capacity
404... electric capacity
112... diode
113... power field effect transistor
114... choke
402... choke
116... current detecting unit
117... resistance
122... resistance
123... resistance
124... resistance
126... resistance
127... resistance
128... resistance
131... resistance
132... resistance
137... resistance
223... resistance
224... resistance
405... resistance
118...PTC thermistor
129...PTC thermistor
133...PTC thermistor
138...PTC thermistor
225...PTC thermistor
227...PTC thermistor
120... voltage source
121... driving IC
136... driving IC
125... shunt regulator
130...NTC thermistor
226...NTC thermistor
134... transistor
140... temperature-sensitive electric capacity
141... the ancillary coil of choke
300... circuit substrate
301...LED substrate
400... fuse
Claims (9)
1. a LED point lamp device, possesses:
Power transformation circuit, it is powered to light-emitting diode and LED after converting the electric power supplied from power supply; And
Control circuit, its switch element driving this power transformation circuit to possess,
The feature of described LED point lamp device is, described control circuit possesses:
1st temperature-sensitive circuit, it possesses temperature-sensing element; And
Opening time adjusted circuit, its output based on the 1st temperature-sensitive circuit decides the opening time of described switch element,
Described 1st temperature-sensitive circuit is when temperature is than the 1st fiducial temperature height around, following signal is exported to adjusted circuit described opening time, this signal is for not making change the turn-on time of described switch element compared with time lower than described 1st fiducial temperature with environment temperature and extending the signal of opening time, and wherein said environment temperature is the temperature in the airtight space of the temperature of the extraneous air contacted with described LED point lamp device or described LED point lamp device.
2. a LED point lamp device, possesses:
Power transformation circuit, it is powered to light-emitting diode and LED after converting the electric power supplied from power supply; And
Control circuit, its switch element driving this power transformation circuit to possess,
The feature of described LED point lamp device is, described control circuit possesses:
1st temperature-sensitive circuit, it possesses temperature-sensing element; And
Opening time adjusted circuit, its output based on the 1st temperature-sensitive circuit decides the opening time of described switch element,
Described 1st temperature-sensitive circuit is when temperature is than the 1st fiducial temperature height around, following signal is exported to adjusted circuit described opening time, this signal is for not making change the turn-on time of described switch element compared with time lower than described 1st fiducial temperature with environment temperature and extending the signal of opening time, wherein said environment temperature is the temperature in the airtight space of the temperature of the extraneous air contacted with described LED point lamp device or described LED point lamp device
Described 1st temperature-sensitive circuit is when temperature is lower than described 1st fiducial temperature around, by being used for, the signal being set to constant the opening time of described switch element is outputted to adjusted circuit described opening time, when temperature is than described 1st fiducial temperature height around, environment temperature is higher, then the signal making the opening time of described switch element longer outputs to adjusted circuit described opening time.
3. LED point lamp device according to claim 1 and 2, is characterized in that,
Described 1st temperature-sensitive circuit being equivalent to be connected to the RC circuit on voltage source possesses temperature sensitive resister as described temperature-sensing element and electric capacity,
Described 1st temperature-sensitive circuit exports the voltage risen according to RC time constant, and this RC time constant is decided by the resistance value of described temperature sensitive resister and the static capacity of described electric capacity,
Described opening time adjusted circuit during described switch element is on-state in, the output of described 1st temperature-sensitive circuit is forcibly set to and is roughly zero, during described switch element is off state, the moment reaching set point in the output of described 1st temperature-sensitive circuit connects described switch element.
4. LED point lamp device according to claim 1 and 2, is characterized in that,
Described 1st temperature-sensitive circuit is the resistance circuit possessing temperature sensitive resister, is connected adjusted circuit described opening time,
Described opening time, adjusted circuit connected described switch element with the frequency of the constant determined by the resistance value of described resistance circuit.
5. LED point lamp device according to claim 1 and 2, is characterized in that,
Described control circuit possesses adjusted circuit turn-on time, and it detects the electric current flow through in described power transformation circuit, decides the turn-on time of described switch element based on this electric current,
Described turn-on time, adjusted circuit was during described switch element is on-state, and the moment that the electric current flow through in described power transformation circuit reaches set point disconnects described switch element.
6. LED point lamp device according to claim 1 and 2, is characterized in that,
Described control circuit possesses the 2nd temperature-sensitive circuit with temperature-sensing element, and the set point of electric current is outputted to adjusted circuit described turn-on time by described 2nd temperature-sensitive circuit,
Described turn-on time, adjusted circuit was during described switch element is on-state, and the moment that the electric current flow through in described power transformation circuit reaches the set point of described electric current disconnects described switch element,
Described 2nd temperature-sensitive circuit when temperature is than the 2nd fiducial temperature height around, compared with time lower than described 2nd fiducial temperature with environment temperature, reduces the set point of described electric current,
Described 2nd temperature-sensitive circuit is when temperature is lower than described 2nd fiducial temperature around, and the set point of described electric current is set to constant, and when temperature is than described 2nd fiducial temperature height around, environment temperature is higher, then make the set point of described electric current reduce,
Described 2nd temperature-sensitive circuit being equivalent to be connected to the bleeder circuit on voltage source possesses described temperature-sensing element, and the voltage obtained carrying out dividing potential drop to the voltage of described voltage source exports the set point for electric current.
7. LED point lamp device according to claim 1 and 2, is characterized in that,
Described power supply is the DC power supply AC power supplied from outside undertaken converting by AC-DC translation circuit and obtain,
Described power transformation circuit possesses diode, is equivalent to the power field effect transistor of described switch element and the chopper circuit of choke,
Described control circuit has from the generation unit of described DC power supply via adjuster formation voltage source.
8. LED point lamp device according to claim 1 and 2, is characterized in that,
Described power transformation circuit is the chopper circuit possessing described switch element, diode and choke, and described choke possesses the ancillary coil for making the action under electric current critical conduction mode of described power transformation circuit,
Described 1st temperature-sensitive circuit being equivalent to be connected to the RC circuit on described ancillary coil possesses temperature sensitive resister as described temperature-sensing element and electric capacity,
Described opening time, adjusted circuit was during described switch element is off state, and the moment reaching set point in the output of described 1st temperature-sensitive circuit connects described switch element.
9. LED point lamp device according to claim 1 and 2, is characterized in that,
In the mode contacted with the driving IC of described switch element or built-in described switch element, described temperature-sensing element is installed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-147030 | 2010-06-29 | ||
| JP2010147030A JP5572454B2 (en) | 2010-06-29 | 2010-06-29 | LED lighting device |
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| Publication Number | Publication Date |
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| CN102316627A CN102316627A (en) | 2012-01-11 |
| CN102316627B true CN102316627B (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110040927.4A Expired - Fee Related CN102316627B (en) | 2010-06-29 | 2011-02-17 | Led lighting device |
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| JP6025093B2 (en) * | 2012-07-09 | 2016-11-16 | パナソニックＩｐマネジメント株式会社 | Light emitting diode lighting device, lighting fixture using the same, and vehicle lighting fixture |
| CN103078475B (en) * | 2013-01-08 | 2015-11-25 | 西南交通大学 | The two edge constant off-time modulation voltage type control method of switch converters and device thereof |
| CN103066811B (en) * | 2013-01-08 | 2015-10-14 | 西南交通大学 | Switch converter double-edge constant breakover time modulation voltage type control method |
| CN103093728A (en) * | 2013-01-29 | 2013-05-08 | 深圳市华星光电技术有限公司 | Light-emitting diode (LED) backlight drive circuit and liquid crystal displayer (LCD) |
| CN104078009B (en) * | 2013-03-25 | 2016-04-06 | 北京京东方光电科技有限公司 | The driving circuit of electrophoresis showed and its implementation and electrophoretic display apparatus |
| TW201506308A (en) * | 2013-08-05 | 2015-02-16 | Cal Comp Electronics & Comm Co | Over temperature protecting apparatus and over temperature protecting method thereof |
| CN103826361B (en) * | 2014-01-14 | 2016-11-23 | 深圳市晶台股份有限公司 | A kind of LED COB controllable temperature system |
| CN103747587B (en) * | 2014-01-15 | 2016-03-30 | 西北工业大学 | A kind of LED lamp radiator temperature online adaptation control circuit |
| JP6369782B2 (en) * | 2014-06-05 | 2018-08-08 | パナソニックＩｐマネジメント株式会社 | Power supply device, headlight device using the power supply device, and vehicle using the headlight device |
| CN107635323B (en) * | 2016-01-13 | 2019-10-08 | 上海新进芯微电子有限公司 | LED drive circuit |
| CN110462805A (en) * | 2017-04-12 | 2019-11-15 | 三菱电机株式会社 | Semiconductor module, the manufacturing method of semiconductor module and power-converting device |
| JP6409102B2 (en) * | 2017-07-14 | 2018-10-17 | 三菱電機照明株式会社 | Power supply device and lighting device |
| CA3078614A1 (en) * | 2017-10-15 | 2019-04-18 | VoltServer, Inc. | Digital power distribution system with a non-linear load |
| CN108055719A (en) * | 2017-11-27 | 2018-05-18 | 安徽文尧智能光电科技有限公司 | The filter circuit that a kind of crawler color separator is dimmed with PWM |
| CN109936887A (en) * | 2017-12-15 | 2019-06-25 | 松下知识产权经营株式会社 | HF switch driving power, excess temperature protection method and the lighting device using the high frequency switch power |
| JP6615295B2 (en) * | 2018-09-21 | 2019-12-04 | 三菱電機照明株式会社 | Power supply device and lighting device |
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Also Published As
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| CN102316627A (en) | 2012-01-11 |
| JP2012014833A (en) | 2012-01-19 |
| JP5572454B2 (en) | 2014-08-13 |
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