CN102387638A - LED (Light-emitting Diode) lamp with temperature-control protective circuit - Google Patents
LED (Light-emitting Diode) lamp with temperature-control protective circuit Download PDFInfo
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- CN102387638A CN102387638A CN2011102706595A CN201110270659A CN102387638A CN 102387638 A CN102387638 A CN 102387638A CN 2011102706595 A CN2011102706595 A CN 2011102706595A CN 201110270659 A CN201110270659 A CN 201110270659A CN 102387638 A CN102387638 A CN 102387638A
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Abstract
The invention discloses an LED (Light-emitting Diode) lamp with a temperature-control protective circuit. The LED lamp comprises a power supply board (101), the temperature-control protective circuit and a radiator (102); the temperature-control protective circuit comprises a rectifying circuit (1), an LED light source load (3), a constant-current circuit (4) and first and second temperature-control switch circuits (6, 7); the first temperature-control switch circuit (6) comprises a first normally-closed temperature-control switch (F2) which is arranged on the radiator (102); when the temperature of the radiator (102) is higher than a switch-off temperature of the first normally-closed temperature control switch (F2), the first normally-closed temperature-control switch (F2) is switched off to cut off the supply power of the LED light source load (3); the second temperature-control switch circuit (7) comprises a second normally-closed temperature-control switch (F3) which is installed on the power supply board (101) and a voltage-dividing resistor; when an environment temperature of the circuit is higher than the switch-off temperature of the second normally-closed temperature-control switch (F3), the second normally-closed temperature-control switch (F3) is switched off and the current passes through the voltage-dividing resistor, so that a power supply current of the LED light source load (3) is reduced; and the LED lamp can be applied to the LED illumination field.
Description
Technical field
The present invention relates to a kind of LED lamp with the temperature control protective circuit.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Present LED illumination more and more develops towards high-power direction, and the high heat that great power LED brings is the key factor that puzzlement LED popularizes.If LED at high temperature works for a long time, then its life-span can shorten greatly, has influenced the performance of its advantage, even produces dead lamp phenomenon, causes light fixture to be scrapped.If when overtemperature, can close light fixture automatically, then can avoid the generation of above-mentioned negative consequence.But in some occasion,, still need throw light on,, then can't realize illumination functions, can not satisfy the use needs if this moment, light fixture was closed even temperature is higher.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that overcomes prior art, provide a kind of simple in structure, control is reliable, the LED lamp that when temperature is higher, still can throw light on, have the band temperature control protective circuit of high temperature protection function.
The technical scheme that the present invention adopted is: the present invention includes power panel and the temperature control protective circuit thereof that is used to the led light source power supply, the radiator that is used to the led light source heat radiation; Said temperature control protective circuit comprises alternating current is become galvanic rectification circuit, led light source load, carries out the constant-current circuit of voltage stabilizing, current stabilization for said led light source load; Said temperature control protective circuit also comprises first temperature switch circuit, second temperature switch circuit; Said first temperature switch circuit is connected to the input of power supply; Said first temperature switch circuit comprises the first normally closed temperature detect switch (TDS), and the said first normally closed temperature detect switch (TDS) is loaded on the said radiator, when said radiator temperature is higher than the break-off signal of the said first normally closed temperature detect switch (TDS); The said first normally closed temperature detect switch (TDS) breaks off; Cut off the power supply of said led light source load, said second temperature switch circuit comprises that the second normally closed temperature detect switch (TDS) reaches and the parallelly connected divider resistance of the said second normally closed temperature detect switch (TDS), and the said second normally closed temperature detect switch (TDS) is loaded on the said power panel; When the circuit ambient temperature is higher than the break-off signal of the said second normally closed temperature detect switch (TDS); The said second normally closed temperature detect switch (TDS) breaks off, and electric current passes through from said divider resistance, to reduce the supply current of said led light source load.
Said led light source load comprises at least one group of several LED that are in series; Said constant-current circuit comprises at least one group of constant-current source device; Every group of said constant-current source device is in series with at least one group of LED in the said led light source load and is connected; Every group of said constant-current source device comprises at least one depletion mode fet, and the drain electrode of said depletion mode fet is a contact, and the source electrode of said depletion mode fet and grid short circuit mutually constitute another contact.
Every group of said constant-current source device all and be connected with first voltage stabilizing didoe, the voltage stabilizing working point of said first voltage stabilizing didoe is a specific voltage between 20～80V DC.
Said temperature control protective circuit also comprises filter circuit, and said filter circuit is connected to after the said rectification circuit.
Said temperature control protective circuit also comprises voltage stabilizing and pfc circuit, and said voltage stabilizing and pfc circuit are connected to after the said rectification circuit.
Said second temperature switch circuit is connected with the sampled voltage end of the voltage output end of said voltage stabilizing and pfc circuit; When the circuit ambient temperature is higher than the break-off signal of the said second normally closed temperature detect switch (TDS); The said second normally closed temperature detect switch (TDS) breaks off; Electric current passes through from said divider resistance, and the output voltage of the voltage output end of said voltage stabilizing and pfc circuit reduces, and reduces the input voltage of the voltage input end of said led light source load.
Perhaps, said second temperature switch circuit is in series with said led light source load and is connected.
Said temperature control protective circuit also comprises current foldback circuit, and said current foldback circuit is connected to the input of power supply, and said current foldback circuit comprises the overcurrent protection protective tube.
Said temperature control protective circuit also comprises the power lightning protection circuit, and said power lightning protection circuit is connected to after said current foldback circuit and said first temperature switch circuit.
Said temperature control protective circuit also comprises power supply EMC circuit, and said power supply EMC circuit is connected to before the said rectification circuit.
Said temperature control protective circuit also comprises light source EMC circuit, and said light source EMC circuit is connected to before the said led light source load.
The break-off signal of the said first normally closed temperature detect switch (TDS) is a specified temp between 60～100 ℃, and the break-off signal of the said second normally closed temperature detect switch (TDS) is a specified temp between 30～100 ℃.
Said temperature control protective circuit also comprises radiator fan motor, fan protection circuit; Said fan protection circuit and said radiator fan motor are in parallel; Said fan protection circuit comprises at least one fan shunt resistance and second voltage stabilizing didoe parallelly connected with said fan shunt resistance, and the voltage stabilizing working point of said second voltage stabilizing didoe is a specific voltage between 5～24V DC.
The invention has the beneficial effects as follows: because temperature control protective circuit according to the invention also comprises first temperature switch circuit, second temperature switch circuit; Said first temperature switch circuit is connected to the input of power supply; Said first temperature switch circuit comprises the first normally closed temperature detect switch (TDS), and the said first normally closed temperature detect switch (TDS) is loaded on the said radiator, when said radiator temperature is higher than the break-off signal of the said first normally closed temperature detect switch (TDS); The said first normally closed temperature detect switch (TDS) breaks off; Cut off the power supply of said led light source load, said second temperature switch circuit comprises that the second normally closed temperature detect switch (TDS) reaches and the parallelly connected divider resistance of the said second normally closed temperature detect switch (TDS), and the said second normally closed temperature detect switch (TDS) is loaded on the said power panel; When the circuit ambient temperature is higher than the break-off signal of the said second normally closed temperature detect switch (TDS); The said second normally closed temperature detect switch (TDS) breaks off, and electric current passes through from said divider resistance, to reduce the supply current of said led light source load; When operating ambient temperature reaches the break-off signal of the said second normally closed temperature detect switch (TDS); Electric current passes through from said divider resistance; Reducing the supply current of said led light source load, thereby reduce the power of said led light source, reduce heating; Make light fixture under extreme ambient temperature, still can keep illumination condition, satisfy instructions for use; But when reason such as electronic devices and components accidental damage causes said radiator temperature too high, in case when being higher than the break-off signal of the said first normally closed temperature detect switch (TDS), explain that the led light source temperature is too high; At this moment, the said first normally closed temperature detect switch (TDS) breaks off, and cuts off the power supply of said led light source load; Power supply quits work, and said led light source is played a protective role, and avoids when thermal extremes, burning; Guaranteed the reliability and the life-span of light fixture itself, when said radiator temperature was reduced to the break-off signal that is lower than the said first normally closed temperature detect switch (TDS), the said first normally closed temperature detect switch (TDS) was returned to closure state again; Said led light source is lighted again, and above scheme has avoided LED to influence the life-span and scrap owing to overheated, prolongs the useful life of LED; Protection LED avoids high temperature and destroys; When temperature is higher, still move simultaneously, satisfied instructions for use, so the present invention is simple in structure, control reliable, when temperature is higher, still can throw light on, have the high temperature protection function with low power state;
Because said led light source load comprises at least one group of several LED that are in series; Said constant-current circuit comprises at least one group of constant-current source device; Every group of said constant-current source device is in series with at least one group of LED in the said led light source load and is connected; Every group of said constant-current source device comprises at least one depletion mode fet, and the drain electrode of said depletion mode fet is a contact, and the source electrode of said depletion mode fet and grid short circuit mutually constitute another contact; Said constant-current source device is as an independent devices, and the peripheral voltage stabilizing and the current stabilization circuit of existing other circuit of convenient replacement make circuit element significantly reduce, circuit is simple, cost is low, so the present invention is simple in structure, cost is low;
Because every group of said constant-current source device all and be connected with first voltage stabilizing didoe; The voltage stabilizing working point of said first voltage stabilizing didoe is a specific voltage between 20～80V DC; Through said first voltage stabilizing didoe is set, make said constant-current source device voltage control within the specific limits, it is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage cause; Minimizing impacts to constant-current source; Avoid constant-current source device to damage, guarantee the stable operation of entire circuit, so the present invention controls reliably, is with the key element over-voltage protecting function;
Because said temperature control protective circuit also comprises radiator fan motor, fan protection circuit; Said fan protection circuit and said radiator fan motor are in parallel; Said fan protection circuit comprises at least one fan shunt resistance and second voltage stabilizing didoe parallelly connected with said fan shunt resistance, and the voltage stabilizing working point of said second voltage stabilizing didoe is a specific voltage between 5～24V DC; Through said second voltage stabilizing didoe is set; Make said radiator fan motor voltage control within the specific limits; It is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes, and reduces that radiator fan motor is impacted, and avoids fan to damage; Guarantee the heat radiation stable operation of entire circuit, so the present invention also has the fan over-voltage protecting function.
Description of drawings
Fig. 1 is the structural representation of the temperature control protective circuit of the embodiment of the invention one;
Fig. 2 is the structural representation of the temperature control protective circuit of the embodiment of the invention two;
Fig. 3 is the structural representation of the temperature control protective circuit of the embodiment of the invention three;
Fig. 4 is the structural representation of the temperature control protective circuit of the embodiment of the invention four;
Fig. 5 is the section structure sketch map of the LED lamp of the embodiment of the invention one, two;
Fig. 6 is the decomposition texture sketch map of the LED lamp of the embodiment of the invention one, two;
Fig. 7 is the section structure sketch map of the LED lamp of the embodiment of the invention three, four;
Fig. 8 is the decomposition texture sketch map of the LED lamp of the embodiment of the invention three, four;
Fig. 9 is the characteristic of constant-current source device of the present invention and current-voltage (I-V) curve synoptic diagram when falling power;
Figure 10 is current-voltage (I-V) curve synoptic diagram of LED under different temperatures.
Embodiment
Embodiment one:
Like Fig. 1, Fig. 5, Fig. 6, Fig. 9, shown in Figure 10; The LED lamp of the band temperature control protective circuit of present embodiment comprises power panel 101 and the temperature control protective circuit thereof that is used to led light source power supply, radiator 102, water proof and dust proof lampshade 103, the reflection shield 104 that is used to the led light source heat radiation, and said temperature control protective circuit comprises alternating current is become galvanic rectification circuit 1, led light source load 3, carries out constant-current circuit 4, current foldback circuit 5, first temperature switch circuit 6, second temperature switch circuit 7 of voltage stabilizing, current stabilization for said led light source load 3; Said rectification circuit 1 adopts bridge rectifier to comprise rectifier bridge D1; Can certainly adopt other rectifier system rectifications, said current foldback circuit 5 is connected to the input of power supply, and said current foldback circuit 5 comprises overcurrent protection protective tube F1; When the circuit overcurrent; Said overcurrent protection protective tube F1 fusing plays a protective role, and can certainly adopt other forms of current foldback circuit; Said first temperature switch circuit 6 is connected to the input of power supply; Said first temperature switch circuit 6 comprises the first normally closed temperature detect switch (TDS) F2; The said first normally closed temperature detect switch (TDS) F2 is loaded on the said radiator 102; When said radiator 102 temperature were higher than the break-off signal of the said first normally closed temperature detect switch (TDS) F2, the said first normally closed temperature detect switch (TDS) F2 broke off, and cuts off the power supply of said led light source load 3; Said second temperature switch circuit 7 is in series with said led light source load 3 and is connected; Said second temperature switch circuit 7 comprises that the second normally closed temperature detect switch (TDS) F3 reaches and the parallelly connected divider resistance Rt of the said second normally closed temperature detect switch (TDS) F3; The said second normally closed temperature detect switch (TDS) F3 is loaded on the said power panel 101; When the circuit ambient temperature was higher than the break-off signal of the said second normally closed temperature detect switch (TDS) F3, the said second normally closed temperature detect switch (TDS) F3 broke off, and electric current passes through from divider resistance Rt; To reduce the supply current of said led light source load 3; Avoid LED to extinguish, the break-off signal of the said first normally closed temperature detect switch (TDS) F2 is 70 ℃, and the break-off signal scope of the said first normally closed temperature detect switch (TDS) F2 can be chosen to be a specified temp between 60～100 ℃; The break-off signal of the said second normally closed temperature detect switch (TDS) F3 is 50 ℃, and the break-off signal scope of the said second normally closed temperature detect switch (TDS) F3 can be chosen to be a specified temp between 30～100 ℃; Power input voltage is the specific voltage section between the interchange 90～300V of applicable various countries line voltage; The fluctuation range of said specific voltage section is ± 30V; Can guarantee that civil power is when the fluctuation of ± 30V scope; Can not burn the components and parts in the circuit; Alternating current becomes Rectified alternating current after said rectification circuit 1 rectification, Rectified alternating current is through said led light source load 3, said second temperature switch circuit 7, said constant-current circuit 4 formation loops, and voltage stabilizing, current stabilization are carried out in 4 pairs of said led light source loads 3 of said constant-current circuit; Said led light source load 3 comprises one group of several LED that are in series; Be LED 1～LED (n); The number n of every group of LED that is in series is decided by the requirement of the size of the height of input voltage, rated power, light illumination, is generally 30～125, and its basic calculating standard is n=90V/3V～300V/2.4V=30～125; Said constant-current circuit 4 comprises one group of constant-current source device; This is organized said constant-current source device and comprises a depletion mode fet Q1, and the drain electrode of said depletion mode fet Q1 is a contact, and the source electrode of said depletion mode fet Q1 and grid short circuit mutually constitute another contact.
In the present embodiment, said temperature control protective circuit does not comprise filter capacitor, makes the reactive power of circuit significantly reduce, and warp is tested the power factor (PF) of circuit of the present invention greater than 0.85, even can be a kind of High Power Factor led drive circuit therefore up to 0.90; When Rectified alternating current fluctuates within the specific limits; Said constant-current source device can stop the fluctuation of electric current, keeps constant current, makes more constant through the electric current of said led light source load 3; And fluctuation voltage is added on the said constant-current source device; Thereby the function with voltage stabilizing, current stabilization prolongs the useful life of said led light source load 3, avoids burning.
The current-voltage curve sketch map of LED under different temperatures seen Figure 10.The characteristic of LED is under identical current conditions, and when temperature raise, the voltage at LED two ends can reduce.Though the reduction amplitude of each LED voltage is little, when up to a hundred LED were cascaded, the total voltage of led light source part can reduce bigger.When ambient temperature raise (as greater than 40 ℃), even if at the constant current environment, the total voltage at light source two ends also possibly descend about 10V, and the voltage of decline can be attached to the two ends of said constant-current source device, and the voltage at the two ends of said constant-current source device is raise.The characteristic of the constant-current source device of present embodiment and the current-voltage curve sketch map when falling power are seen Fig. 9.Voltage V between drain electrode and source electrode
DSGreater than saturation voltage V
TWhen (a point), the drain electrode of constant-current source device and the electric current I between the source electrode
DSDemonstrate the characteristic of constant current, general constant-current source device with real work voltage V
WDesign near the b point, general V
W≈ V
T+ (3～5) V.When the voltage at the two ends of said constant-current source device raises with ambient temperature or input voltage mutation when raising; The working point of said constant-current source device can be moved to the c point by the b point, and the power consumption of said constant-current source device can increase, and makes ambient temperature further raise; When the circuit ambient temperature is higher than the break-off signal of the said second normally closed temperature detect switch (TDS) F3; The said second normally closed temperature detect switch (TDS) F3 breaks off, and breaks off after-current and passes through from said divider resistance Rt, and what the said divider resistance Rt resistance of design made its two ends shares voltage (like 17V) greater than the working point of the said constant-current source device voltage (like 10V) by the rising when c point is mobile of b point; Under the constant current effect of said constant-current source device; This moment, the voltage at said constant-current source device two ends can further reduce, as reducing 7V than initialization voltage, because the cut-in voltage of general said constant-current source device is 5V; At this moment; The voltage that reduces except that the voltage led light source of constant-current source was all absorbed by said divider resistance Rt, the voltage of said constant-current source device further reduced, if V
W=V
T+ 5V, then the voltage of said constant-current source device can be reduced to the low again 2V of saturation voltage than constant current district, and the working point of constant-current source device described in this process finally moves to the linear district of unsaturation that d is ordered by the c point; At this moment, the operating current of said constant-current source device diminishes, and therefore the power of said constant-current source device and LED is all with step-down; Promptly be in the downrating state; Therefore heating reduces, and working temperature reduces, when working temperature drops to the break-off signal of the said second normally closed temperature detect switch (TDS) F3 when following; The closed again work of the said second normally closed temperature detect switch (TDS) F3, entire circuit is returned to normal operating conditions.
Embodiment two:
Like Fig. 2, Fig. 5, Fig. 6, Fig. 9, shown in Figure 10; The difference part of present embodiment and embodiment one is: in the present embodiment; Said temperature control protective circuit also comprises filter circuit 2, and said filter circuit 2 is connected to after the said rectification circuit 1, and filter circuit described in the present embodiment 2 comprises filter capacitor C1 and bleeder resistance R1; Can certainly adopt other filter circuits; Offering the more stable electric current of said led light source load 3, but owing to add filter capacitor, so power factor can be under some influence.
All the other characteristics of present embodiment are identical with embodiment one.
Embodiment three:
Like Fig. 3, Fig. 7～shown in Figure 10; The LED lamp of the band temperature control protective circuit of present embodiment comprises power panel 101 and temperature control protective circuit thereof, the radiator 102, water proof and dust proof lampshade 103, the reflection shield 104 that are used to the led light source heat radiation that is used to led light source power supply, the airtight power pack 105 that is used to protect said power panel 101 water proof and dust proofs, and said temperature control protective circuit comprises alternating current is become galvanic rectification circuit 1, led light source load 3, carries out constant-current circuit 4, current foldback circuit 5, first temperature switch circuit 6, second temperature switch circuit 7, power lightning protection circuit 8, power supply EMC circuit 9, voltage stabilizing and pfc circuit 10, the light source EMC circuit 11 of voltage stabilizing, current stabilization for said led light source load 3; Said rectification circuit 1 adopts bridge rectifier to comprise rectifier bridge D1; Can certainly adopt other rectifier system rectifications, said current foldback circuit 5 is connected to the input of power supply, and said current foldback circuit 5 comprises overcurrent protection protective tube F1; When the circuit overcurrent; Overcurrent and short-circuit protection effect are played in said overcurrent protection protective tube F1 fusing, can certainly adopt other forms of current foldback circuit; Said first temperature switch circuit 6 is connected to the input of power supply; Said first temperature switch circuit 6 comprises the first normally closed temperature detect switch (TDS) F2; The said first normally closed temperature detect switch (TDS) F2 is loaded on the said radiator 102; When said radiator 102 temperature were higher than the break-off signal of the said first normally closed temperature detect switch (TDS) F2, the said first normally closed temperature detect switch (TDS) F2 broke off, and cuts off the power supply of said led light source load 3; Said power lightning protection circuit 8 is connected to after said current foldback circuit 5 and said first temperature switch circuit 6; Be used for lightning protection; Comprise capacitor C 2, piezo-resistance RV1, RV2, R2, temperature safety tube TH3, discharge tube DSA1; Said power supply EMC circuit 9 is connected to before the said rectification circuit 1, and said light source EMC circuit 11 is connected to after said voltage stabilizing and the pfc circuit 10, before the said led light source load 3, so that circuit meets the Electro Magnetic Compatibility requirement; Said power supply EMC circuit 9 comprises resistance R 3, capacitor C 3～C5, transformer T1, negative tempperature coefficient thermistor NTC, and said light source EMC circuit 11 comprises common mode inductance L1, L2, transformer T3; Said voltage stabilizing and pfc circuit 10 are circuit of power factor correction; Be connected to after the said rectification circuit 1, before the said led light source load 3; Be used to said led light source load 3 the voltage galvanic current is provided, and improve the power factor of entire circuit, said voltage stabilizing and pfc circuit 10 are Switching Power Supplies; Comprise power factor correction chip U1; It is the power supply PFC power factor control circuit of MC33262 that said power factor correction chip U1 adopts model, and it has, and circuit is simple, the efficient advantages of higher, and its peripheral cell comprises capacitor C 6～C12, resistance R 4～R9, R12, diode D5, D6, metal-oxide-semiconductor Q1, transformer T2; Said second temperature switch circuit 7 comprises the second normally closed temperature detect switch (TDS) F3 and divider resistance R10 and the sampling resistor R11 parallelly connected with the said second normally closed temperature detect switch (TDS) F3; The said second normally closed temperature detect switch (TDS) F3 is loaded on the said power panel 101 in the said power pack 105; Said second temperature switch circuit 7 is connected with the sampled voltage end A of the voltage output end B of said voltage stabilizing and pfc circuit 10; When the circuit ambient temperature is higher than the break-off signal of the said second normally closed temperature detect switch (TDS) F3; The said second normally closed temperature detect switch (TDS) F3 breaks off, and electric current passes through from said divider resistance R10, and the voltage of said sampled voltage end A raises; For the voltage that makes said sampled voltage end A is reduced to balanced voltage; Said power factor correction chip U1 regulates the voltage that makes said voltage output end B and reduces, and the direct voltage of the voltage input end C of said led light source load 3 equates that with the VD of the voltage output end B of said voltage stabilizing and pfc circuit 10 therefore the input voltage of the voltage input end C of said led light source load 3 reduces; The supply power voltage and the electric current of said led light source load 3 have promptly been reduced simultaneously; Reduced the power of LED light fixture, the break-off signal of the said first normally closed temperature detect switch (TDS) F2 is 70 ℃, and the break-off signal scope of the said first normally closed temperature detect switch (TDS) F2 can be chosen to be a specified temp between 60～100 ℃; The break-off signal of the said second normally closed temperature detect switch (TDS) F3 is 80 ℃, and the break-off signal scope of the said second normally closed temperature detect switch (TDS) F3 can be chosen to be a specified temp between 30～100 ℃; Said led light source load 3 comprises some groups of LED, promptly LED 1a～LED (n) a ..., LED 1x～LED (n) x, each the group between be in parallel; Comprise the LED that several are in series in each group; The number n of every group of LED that is in series is decided by the requirement of the size of the height of input voltage, rated power, light illumination, and said constant-current circuit 4 comprises some groups of constant-current source devices, every group of said constant-current source device comprise a depletion mode fet Qa ..., Qx; Each said depletion mode fet Qa ..., Qx drain electrode be a contact; Each said depletion mode fet Qa ..., Qx source electrode and grid mutually short circuit constitute another contact, every group of said constant-current source device is in series with one group of LED in the said led light source load 3 and is connected, so that every group of LED can both obtain stable operating current; Avoid overcurrent to burn; Increase the service life, certainly, every group of said constant-current source device also can comprise a plurality of depletion mode fets; Every group of said constant-current source device also can be in series with the many groups LED after the parallel connection and be connected; Every group of said constant-current source device comprise a depletion mode fet Qa ..., Qx, each said depletion mode fet Qa ..., Qx drain electrode be a contact, each said depletion mode fet Qa ..., Qx source electrode and grid mutually short circuit constitute another contact; Every group of said constant-current source device is in series with one group of LED in the said led light source load 6 and is connected; So that every group of LED can both obtain stable operating current, avoid overcurrent to burn, increase the service life; Every group of said constant-current source device be depletion mode fet Qa ..., Qx all and be connected with the first voltage stabilizing didoe Da ..., Dx; The said first voltage stabilizing didoe Da ..., Dx the voltage stabilizing working point can be chosen to be certain specific voltage between 20～80V DC according to the watt level of light fixture and the factors such as situation of side circuit; Make said constant-current source device voltage control within the specific limits; It is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes; Minimizing impacts to constant-current source; Avoid constant-current source device to damage, guarantee the stable operation of entire circuit, therefore have the over-voltage protecting function of constant-current source device.
The current-voltage curve sketch map of LED under different temperatures seen Figure 10.The characteristic of LED is under identical current conditions, and when temperature raise, the voltage at LED two ends can reduce.Though the reduction amplitude of each LED voltage is little, when a plurality of LED were cascaded, the total voltage of led light source part can reduce bigger.When ambient temperature raise, even if at the constant current environment, the total voltage at light source two ends also possibly descend bigger, and the voltage of decline can be attached to the two ends of said constant-current source device, and the voltage at the two ends of said constant-current source device is raise.The characteristic of the constant-current source device of present embodiment and the current-voltage curve sketch map when falling power are seen Fig. 9.Voltage V between drain electrode and source electrode
DSGreater than saturation voltage V
TWhen (a point), the drain electrode of constant-current source device and the electric current I between the source electrode
DSDemonstrate the characteristic of constant current, general constant-current source device with real work voltage V
WDesign near the b point, general V
W≈ V
T+ (3～5) V; Therefore raise with ambient temperature or during the input voltage mutation rising when the voltage at the two ends of said constant-current source device; The working point of said constant-current source device can be moved to the c point by the b point, and said constant-current source device of the present invention can be avoided the LED current break, keeps constant current.Work as V
DSLess than saturation voltage V
TWhen (a point), I
DSWith V
DSDiminish and diminish gradually; When the said second normally closed temperature detect switch (TDS) F3 breaks off; Electric current passes through from said divider resistance R10; Adjusting through said power factor correction chip U1 reduces the input voltage of voltage input end C of output voltage and the said led light source load 3 of said voltage output end B, makes the dividing potential drop of said constant-current source device reduce, when being reduced to V
DSLess than saturation voltage V
TThe time, I
DSDiminish, therefore the supply current of said led light source load 3 reduces thereupon, and this moment, the working point of constant-current source device was positioned at the d point, so the power of constant-current source device also reduces thereupon.
Embodiment four:
Like Fig. 4, Fig. 7～shown in Figure 10; The difference part of present embodiment and embodiment three is: in the present embodiment; Said temperature control protective circuit also comprises radiator fan motor 12 (radiator fan is not shown among Fig. 7, Fig. 8), fan protection circuit 13, and said fan protection circuit 13 is in parallel with said radiator fan motor 12, and said fan protection circuit 13 comprises three the fan shunt resistance R13 and the second voltage stabilizing didoe Dfans parallelly connected with said fan shunt resistance R13 of parallel connection mutually; The said fan shunt resistance R13 of a plurality of mutual parallel connections is used for the shunting of high-power circuit; The high temperature of avoiding single resistance to bring, the voltage stabilizing working point of the said second voltage stabilizing didoe Dfan are a specific voltage between 5～24V DC, through the said second voltage stabilizing didoe Dfan is set; Make said radiator fan motor 12 voltage control within the specific limits; It is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes, and avoids radiator fan motor 12 is impacted, and avoids fan to damage; Guarantee the heat radiation stable operation of entire circuit, therefore have the fan over-voltage protecting function.
All the other characteristics of present embodiment are identical with embodiment three.
Above embodiment only is to exemplary explanation of the present invention, is not to be the restriction to claim of the present invention.
Current stabilization and voltage were reduced to the characteristic that electric current reduces when being lower than saturation voltage when the present invention had utilized constant-current source voltage to raise; Cooperate temperature detect switch (TDS); LED electric current and power have been realized when high temperature, reducing; Thereby guaranteeing the function that the LED lamp can be worked and LED itself do not damaged when higher temperature, realized the dual needs of illumination functions and autoprotection to the full extent, is the breakthrough of LED illumination under the extreme industrial and mineral.
The present invention can be widely used in the LED lighting field.
Claims (13)
1. LED lamp with the temperature control protective circuit; Comprise power panel (101) and the temperature control protective circuit thereof that is used to the led light source power supply, the radiator (102) that is used to the led light source heat radiation; Said temperature control protective circuit comprises alternating current is become galvanic rectification circuit (1), led light source load (3), carries out the constant-current circuit (4) of voltage stabilizing, current stabilization for said led light source load (3); It is characterized in that: said temperature control protective circuit also comprises first temperature switch circuit (6), second temperature switch circuit (7); Said first temperature switch circuit (6) is connected to the input of power supply; Said first temperature switch circuit (6) comprises the first normally closed temperature detect switch (TDS) (F2), and the said first normally closed temperature detect switch (TDS) (F2) is loaded on the said radiator (102), when said radiator (102) temperature is higher than the break-off signal of the said first normally closed temperature detect switch (TDS) (F2); The said first normally closed temperature detect switch (TDS) (F2) breaks off; Cut off the power supply of said led light source load (3), said second temperature switch circuit (7) comprises that the second normally closed temperature detect switch (TDS) (F3) reaches and the parallelly connected divider resistance of the said second normally closed temperature detect switch (TDS) (F3), and the said second normally closed temperature detect switch (TDS) (F3) is loaded on the said power panel (101); When the circuit ambient temperature is higher than the break-off signal of the said second normally closed temperature detect switch (TDS) (F3); The said second normally closed temperature detect switch (TDS) (F3) breaks off, and electric current passes through from said divider resistance, to reduce the supply current of said led light source load (3).
2. the LED lamp of band temperature control protective circuit according to claim 1; It is characterized in that: said led light source load (3) comprises at least one group of several LED that are in series; Said constant-current circuit (4) comprises at least one group of constant-current source device; Every group of said constant-current source device is in series with at least one group of LED in the said led light source load (3) and is connected; Every group of said constant-current source device comprises at least one depletion mode fet, and the drain electrode of said depletion mode fet is a contact, and the source electrode of said depletion mode fet and grid short circuit mutually constitute another contact.
3. the LED lamp of band temperature control protective circuit according to claim 2; It is characterized in that: every group of said constant-current source device all and be connected with first voltage stabilizing didoe, the voltage stabilizing working point of said first voltage stabilizing didoe is a specific voltage between 20～80V DC.
4. the LED lamp of band temperature control protective circuit according to claim 1 is characterized in that: said temperature control protective circuit also comprises filter circuit (2), and said filter circuit (2) is connected to said rectification circuit (1) afterwards.
5. the LED lamp of band temperature control protective circuit according to claim 1 is characterized in that: said temperature control protective circuit also comprises voltage stabilizing and pfc circuit (10), and said voltage stabilizing and pfc circuit (10) are connected to said rectification circuit (1) afterwards.
6. the LED lamp of band temperature control protective circuit according to claim 5; It is characterized in that: said second temperature switch circuit (7) is connected with the sampled voltage end (A) of the voltage output end (B) of said voltage stabilizing and pfc circuit (10); When the circuit ambient temperature is higher than the break-off signal of the said second normally closed temperature detect switch (TDS) (F3); The said second normally closed temperature detect switch (TDS) (F3) breaks off; Electric current passes through from said divider resistance (R10), and the output voltage of the voltage output end (B) of said voltage stabilizing and pfc circuit (10) reduces, and reduces the input voltage of the voltage input end (C) of said led light source load (3).
7. the LED lamp of band temperature control protective circuit according to claim 1 is characterized in that: said second temperature switch circuit (7) is in series with said led light source load (3) and is connected.
8. the LED lamp of band temperature control protective circuit according to claim 1; It is characterized in that: said temperature control protective circuit also comprises current foldback circuit (5); Said current foldback circuit (5) is connected to the input of power supply, and said current foldback circuit (5) comprises overcurrent protection protective tube (F1).
9. the LED lamp of band temperature control protective circuit according to claim 8; It is characterized in that: said temperature control protective circuit also comprises power lightning protection circuit (8), and said power lightning protection circuit (8) is connected to said current foldback circuit (5) and said first temperature switch circuit (6) afterwards.
10. the LED lamp of band temperature control protective circuit according to claim 1 is characterized in that: said temperature control protective circuit also comprises power supply EMC circuit (9), and said power supply EMC circuit (9) is connected to said rectification circuit (1) before.
11. the LED lamp of band temperature control protective circuit according to claim 1 is characterized in that: said temperature control protective circuit also comprises light source EMC circuit (11), and said light source EMC circuit (11) is connected to said led light source load (3) before.
12. the LED lamp of band temperature control protective circuit according to claim 1; It is characterized in that: the break-off signal of the said first normally closed temperature detect switch (TDS) (F2) is a specified temp between 60～100 ℃, and the break-off signal of the said second normally closed temperature detect switch (TDS) (F3) is a specified temp between 30～100 ℃.
13. the LED lamp of band temperature control protective circuit according to claim 1; It is characterized in that: said temperature control protective circuit also comprises radiator fan motor (12), fan protection circuit (13); Said fan protection circuit (13) is in parallel with said radiator fan motor (12); Said fan protection circuit (13) comprises at least one fan shunt resistance (R13) and second voltage stabilizing didoe (Dfan) parallelly connected with said fan shunt resistance (R13), and the voltage stabilizing working point of said second voltage stabilizing didoe (Dfan) is a specific voltage between 5～24V DC.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110270659.5A CN102387638B (en) | 2011-09-14 | 2011-09-14 | LED (Light-emitting Diode) lamp with temperature-control protective circuit |
| EP12785251.5A EP2712278A4 (en) | 2011-05-17 | 2012-05-08 | Led lamp control circuit |
| PCT/CN2012/075210 WO2012155801A1 (en) | 2011-05-17 | 2012-05-08 | Led lamp control circuit |
| US14/233,697 US8878463B2 (en) | 2011-05-17 | 2012-05-08 | LED lamp control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110270659.5A CN102387638B (en) | 2011-09-14 | 2011-09-14 | LED (Light-emitting Diode) lamp with temperature-control protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102387638A true CN102387638A (en) | 2012-03-21 |
| CN102387638B CN102387638B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110270659.5A Expired - Fee Related CN102387638B (en) | 2011-05-17 | 2011-09-14 | LED (Light-emitting Diode) lamp with temperature-control protective circuit |
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| Country | Link |
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| CN (1) | CN102387638B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155801A1 (en) * | 2011-05-17 | 2012-11-22 | 广州南科集成电子有限公司 | Led lamp control circuit |
| CN103428952A (en) * | 2012-05-25 | 2013-12-04 | 原景科技股份有限公司 | Driving current control circuit and operating method thereof |
| CN103428950A (en) * | 2012-05-24 | 2013-12-04 | 天楹（上海）光电科技有限公司 | LED lighting lamp circuit conductive to heat radiation |
| CN103716969A (en) * | 2014-01-10 | 2014-04-09 | 周芸 | Small vehicle LED tail lamp and license plate lamp |
| CN103813592A (en) * | 2014-02-19 | 2014-05-21 | 上海亚明照明有限公司 | Linear power driving LED lamp and thunder-proof linear power driving LED lamp |
| JP2014096576A (en) * | 2012-10-10 | 2014-05-22 | Citizen Electronics Co Ltd | LED Drive circuit |
| CN108521692A (en) * | 2018-03-21 | 2018-09-11 | 深圳市富满电子集团股份有限公司 | The temprature control method and LED illumination System of LED illumination System |
| CN110147126A (en) * | 2019-05-15 | 2019-08-20 | 苏州佳世达电通有限公司 | Temperature-control circuit and its control method |
| CN114721461A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | Constant current source circuit with irradiation-resistant dual protection |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247238A (en) * | 1991-04-05 | 1993-09-21 | Yang Tai Her | Battery charger automatic cut-off circuit |
| CN2306602Y (en) * | 1996-05-02 | 1999-02-03 | 刘卫方 | Temp.-controlled power-off protection alarm |
| CN2376121Y (en) * | 1998-09-04 | 2000-04-26 | 杨泰和 | Temperature control switch controlled holding charging circuit for wide voltage changing range |
| CN201265778Y (en) * | 2008-10-14 | 2009-07-01 | 丹阳市鹏飞路灯照明有限公司 | Intelligent automatic control type LED road lamp |
| CN201836744U (en) * | 2010-08-04 | 2011-05-18 | 李定强 | LED (light-emitting diode) bulkhead lamp |
| CN102098848A (en) * | 2011-01-24 | 2011-06-15 | 广州南科集成电子有限公司 | High power factor constant current light-emitting diode (LED) lighting circuit |
-
2011
- 2011-09-14 CN CN201110270659.5A patent/CN102387638B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247238A (en) * | 1991-04-05 | 1993-09-21 | Yang Tai Her | Battery charger automatic cut-off circuit |
| CN2306602Y (en) * | 1996-05-02 | 1999-02-03 | 刘卫方 | Temp.-controlled power-off protection alarm |
| CN2376121Y (en) * | 1998-09-04 | 2000-04-26 | 杨泰和 | Temperature control switch controlled holding charging circuit for wide voltage changing range |
| CN201265778Y (en) * | 2008-10-14 | 2009-07-01 | 丹阳市鹏飞路灯照明有限公司 | Intelligent automatic control type LED road lamp |
| CN201836744U (en) * | 2010-08-04 | 2011-05-18 | 李定强 | LED (light-emitting diode) bulkhead lamp |
| CN102098848A (en) * | 2011-01-24 | 2011-06-15 | 广州南科集成电子有限公司 | High power factor constant current light-emitting diode (LED) lighting circuit |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155801A1 (en) * | 2011-05-17 | 2012-11-22 | 广州南科集成电子有限公司 | Led lamp control circuit |
| US8878463B2 (en) | 2011-05-17 | 2014-11-04 | Nanker (Guang Zhou) Semiconductor Manufacturing Corp. | LED lamp control circuit |
| CN103428950A (en) * | 2012-05-24 | 2013-12-04 | 天楹（上海）光电科技有限公司 | LED lighting lamp circuit conductive to heat radiation |
| CN103428952A (en) * | 2012-05-25 | 2013-12-04 | 原景科技股份有限公司 | Driving current control circuit and operating method thereof |
| JP2014096576A (en) * | 2012-10-10 | 2014-05-22 | Citizen Electronics Co Ltd | LED Drive circuit |
| CN103716969A (en) * | 2014-01-10 | 2014-04-09 | 周芸 | Small vehicle LED tail lamp and license plate lamp |
| CN103716969B (en) * | 2014-01-10 | 2015-08-26 | 重庆广播电视大学 | Small vehicle LED tail and license plate lamp |
| CN103813592A (en) * | 2014-02-19 | 2014-05-21 | 上海亚明照明有限公司 | Linear power driving LED lamp and thunder-proof linear power driving LED lamp |
| CN108521692A (en) * | 2018-03-21 | 2018-09-11 | 深圳市富满电子集团股份有限公司 | The temprature control method and LED illumination System of LED illumination System |
| CN110147126A (en) * | 2019-05-15 | 2019-08-20 | 苏州佳世达电通有限公司 | Temperature-control circuit and its control method |
| CN114721461A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | Constant current source circuit with irradiation-resistant dual protection |
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