CN102387638B - 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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- CN102387638B CN102387638B CN201110270659.5A CN201110270659A CN102387638B CN 102387638 B CN102387638 B CN 102387638B CN 201110270659 A CN201110270659 A CN 201110270659A CN 102387638 B CN102387638 B CN 102387638B
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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 temperature control protective circuit.
Background technology
At present, the application of LED is more and more extensive, for daily indoor also just more and more universal with LED light fixture outdoor lighting.Current LED illumination is more and more towards high-power future development, and the high heat that great power LED brings is a universal key factor of puzzlement LED.If LED at high temperature works for a long time, its life-span can shorten greatly, has affected the performance of its advantage, even produces dead lamp phenomenon, causes light fixture to be scrapped.If can automatically close light fixture when overtemperature, can avoid the generation of above-mentioned negative consequence.But in some occasion, even if temperature is higher, still need to throw light on, if now light fixture is closed, cannot realize illumination functions, can not meet use needs.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, provide a kind of simple in structure, control the LED lamp with temperature control protective circuit reliable, still can throw light on, have high temperature protection function when temperature is higher.
The technical solution adopted in the present invention is: the present invention includes the power panel and the temperature control protective circuit thereof that are used to LED light source power supply, be used to the radiator of LED light source heat radiation, described temperature control protective circuit comprises alternating current is become to galvanic rectification circuit, LED light source load, for voltage stabilizing is carried out in described LED light source load, the constant-current circuit of current stabilization, described temperature control protective circuit also comprises the first temperature switch circuit, the second temperature switch circuit, described the first temperature switch circuit is connected to the input of power supply, described the first temperature switch circuit comprises the first normally closed temperature detect switch (TDS), described the first normally closed temperature detect switch (TDS) is loaded on described radiator, when described radiator temperature is during higher than the break-off signal of described the first normally closed temperature detect switch (TDS), described the first normally closed temperature detect switch (TDS) disconnects, cut off the power supply of described LED light source load, described the second temperature switch circuit comprises the second normally closed temperature detect switch (TDS) and the divider resistance in parallel with described the second normally closed temperature detect switch (TDS), described the second normally closed temperature detect switch (TDS) is loaded on described power panel, when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS), described the second normally closed temperature detect switch (TDS) disconnects, electric current passes through from described divider resistance, to reduce the supply current of described LED light source load.
Described LED light source load comprises at least one group of several LED that are in series, described constant-current circuit comprises at least one group of constant-current source device, described in every group, constant-current source device is in series and is connected with at least one group of LED in described LED light source load, described in every group, constant-current source device comprises at least one depletion mode fet, the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet forms another contact with grid phase short circuit.
Described in every group, all and be connected with the first voltage stabilizing didoe, the voltage stabilizing working point of described the first voltage stabilizing didoe is a specific voltage between 20～80V DC to constant-current source device.
Described temperature control protective circuit also comprises filter circuit, after described filter circuit is connected to described rectification circuit.
Described temperature control protective circuit also comprises voltage stabilizing and pfc circuit, after described voltage stabilizing and pfc circuit are connected to described rectification circuit.
Described the second temperature switch circuit is connected with the sampled voltage end of the voltage output end of described voltage stabilizing and pfc circuit, when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS), described the second normally closed temperature detect switch (TDS) disconnects, electric current passes through from described divider resistance, the output voltage of the voltage output end of described voltage stabilizing and pfc circuit reduces, and reduces the input voltage of the voltage input end of described LED light source load.
Or described the second temperature switch circuit is in series and is connected with described LED light source load.
Described temperature control protective circuit also comprises current foldback circuit, and described current foldback circuit is connected to the input of power supply, and described current foldback circuit comprises overcurrent protection protective tube.
Described temperature control protective circuit also comprises power lightning protection circuit, after described power lightning protection circuit is connected to described current foldback circuit and described the first temperature switch circuit.
Described temperature control protective circuit also comprises power supply EMC circuit, before described power supply EMC circuit is connected to described rectification circuit.
Described temperature control protective circuit also comprises light source EMC circuit, before described light source EMC circuit is connected to described LED light source load.
The break-off signal of described the first normally closed temperature detect switch (TDS) is a specified temp between 60～100 ℃, and the break-off signal of described the second normally closed temperature detect switch (TDS) is a specified temp between 30～100 ℃.
Described temperature control protective circuit also comprises radiator fan motor, fan protection circuit; described fan protection circuit and described radiator fan motor are in parallel; described fan protection circuit comprises at least one fan shunt resistance and second voltage stabilizing didoe in parallel with described fan shunt resistance, and the voltage stabilizing working point of described the 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 of the present invention also comprises the first temperature switch circuit, the second temperature switch circuit, described the first temperature switch circuit is connected to the input of power supply, described the first temperature switch circuit comprises the first normally closed temperature detect switch (TDS), described the first normally closed temperature detect switch (TDS) is loaded on described radiator, when described radiator temperature is during higher than the break-off signal of described the first normally closed temperature detect switch (TDS), described the first normally closed temperature detect switch (TDS) disconnects, cut off the power supply of described LED light source load, described the second temperature switch circuit comprises the second normally closed temperature detect switch (TDS) and the divider resistance in parallel with described the second normally closed temperature detect switch (TDS), described the second normally closed temperature detect switch (TDS) is loaded on described power panel, when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS), described the second normally closed temperature detect switch (TDS) disconnects, electric current passes through from described divider resistance, to reduce the supply current of described LED light source load, when operating ambient temperature reaches the break-off signal of described the second normally closed temperature detect switch (TDS), electric current passes through from described divider resistance, to reduce the supply current of described LED light source load, thereby reduce the power of described LED light source, reduce heating, make light fixture still can keep illumination condition under extreme ambient temperature, meet instructions for use, but when the reasons such as electronic devices and components accidental damage cause described radiator temperature too high, once the break-off signal higher than described the first normally closed temperature detect switch (TDS), LED light source excess Temperature is described, now, described the first normally closed temperature detect switch (TDS) disconnects, cut off the power supply of described LED light source load, power supply quits work, described LED light source is played a protective role, avoid burning when thermal extremes, reliability and the life-span of light fixture itself have been guaranteed, when described radiator temperature is reduced to the break-off signal lower than described the first normally closed temperature detect switch (TDS), described the first normally closed temperature detect switch (TDS) is returned to closure state again, described LED light source is lighted again, above scheme has avoided LED affect the life-span and scrap due to overheated, extend the useful life of LED, protection LED avoids high temperature and destroys, when temperature is higher, still with low power state, move simultaneously, met instructions for use, therefore the present invention is simple in structure, control reliable, when temperature is higher, still can throw light on, there is high temperature protection function,
Because described LED light source load comprises at least one group of several LED that are in series, described constant-current circuit comprises at least one group of constant-current source device, described in every group, constant-current source device is in series and is connected with at least one group of LED in described LED light source load, described in every group, constant-current source device comprises at least one depletion mode fet, the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet forms another contact with grid phase short circuit; Described constant-current source device is as a device independently, and convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit greatly reduces circuit element, circuit is simple, cost is low, therefore the present invention is simple in structure, cost is low;
Due to constant-current source device described in every group all and be connected with the first voltage stabilizing didoe, the voltage stabilizing working point of described the first voltage stabilizing didoe is a specific voltage between 20～80V DC, by described the first voltage stabilizing didoe is set, make the voltage control of described constant-current source device within the specific limits, it is too high that the switching surge of avoiding a plurality of light fixtures simultaneously to open generation impacts the instantaneous voltage causing, minimizing impacts constant-current source, avoid constant-current source device to damage, guarantee the stable operation of whole circuit, therefore the present invention controls reliably, is with key element over-voltage protecting function;
Because described temperature control protective circuit also comprises radiator fan motor, fan protection circuit, described fan protection circuit and described radiator fan motor are in parallel, described fan protection circuit comprises at least one fan shunt resistance and second voltage stabilizing didoe in parallel with described fan shunt resistance, and the voltage stabilizing working point of described the second voltage stabilizing didoe is a specific voltage between 5～24V DC; By described the second voltage stabilizing didoe is set; make the voltage control of described radiator fan motor within the specific limits; it is too high that the switching surge of avoiding a plurality of light fixtures simultaneously to open generation impacts the instantaneous voltage causing; minimizing impacts radiator fan motor; avoid fan to damage; guarantee the heat radiation stable operation of whole circuit, therefore the present invention also has fan over-voltage protecting function.
Accompanying drawing explanation
Fig. 1 is the structural representation of the temperature control protective circuit of the embodiment of the present invention one;
Fig. 2 is the structural representation of the temperature control protective circuit of the embodiment of the present invention two;
Fig. 3 is the structural representation of the temperature control protective circuit of the embodiment of the present invention three;
Fig. 4 is the structural representation of the temperature control protective circuit of the embodiment of the present invention four;
Fig. 5 is the section structure schematic diagram of the LED lamp of the embodiment of the present invention one, two;
Fig. 6 is the decomposition texture schematic diagram of the LED lamp of the embodiment of the present invention one, two;
Fig. 7 is the section structure schematic diagram of the LED lamp of the embodiment of the present invention three, four;
Fig. 8 is the decomposition texture schematic diagram of the LED lamp of the embodiment of the present 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 while falling power;
Figure 10 is current-voltage (I-V) curve synoptic diagram of LED under different temperatures.
Embodiment
Embodiment mono-:
As shown in Fig. 1, Fig. 5, Fig. 6, Fig. 9, Figure 10, the LED lamp with temperature control protective circuit of the present embodiment comprises that being used to power panel 101 and the temperature control protective circuit thereof of LED light source power supply, radiator 102, water proof and dust proof lampshade 103, the reflection shield 104 that is used to LED light source to dispel the heat, described temperature control protective circuit to comprise becomes alternating current galvanic rectification circuit 1, LED light source load 3, is constant-current circuit 4, current foldback circuit 5, the first temperature switch circuit 6, the second temperature switch circuit 7 that voltage stabilizing, current stabilization are carried out in described LED light source load 3, described rectification circuit 1 adopts bridge rectifier to comprise rectifier bridge D1, can certainly adopt other rectifier system rectifications, described current foldback circuit 5 is connected to the input of power supply, described current foldback circuit 5 comprises overcurrent protection protective tube F1, when circuit overcurrent, described overcurrent protection protective tube F1 fusing, plays a protective role, and can certainly adopt other forms of current foldback circuit, described the first temperature switch circuit 6 is connected to the input of power supply, described the first temperature switch circuit 6 comprises the first normally closed temperature detect switch (TDS) F2, described the first normally closed temperature detect switch (TDS) F2 is loaded on described radiator 102, when described radiator 102 temperature are during higher than the break-off signal of described the first normally closed temperature detect switch (TDS) F2, described the first normally closed temperature detect switch (TDS) F2 disconnects, and cuts off the power supply of described LED light source load 3, described the second temperature switch circuit 7 is in series and is connected with described LED light source load 3, described the second temperature switch circuit 7 comprises the second normally closed temperature detect switch (TDS) F3 and the divider resistance Rt in parallel with described the second normally closed temperature detect switch (TDS) F3, described the second normally closed temperature detect switch (TDS) F3 is loaded on described power panel 101, when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS) F3, described the second normally closed temperature detect switch (TDS) F3 disconnects, electric current passes through from divider resistance Rt, to reduce the supply current of described LED light source load 3, avoid LED to extinguish, the break-off signal of described the first normally closed temperature detect switch (TDS) F2 is 70 ℃, the break-off signal scope of described the first normally closed temperature detect switch (TDS) F2 can be chosen to be a specified temp between 60～100 ℃, the break-off signal of described the second normally closed temperature detect switch (TDS) F3 is 50 ℃, the break-off signal scope of described the 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 described 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 circuit, alternating current becomes Rectified alternating current after described rectification circuit 1 rectification, Rectified alternating current forms loop through described LED light source load 3, described the second temperature switch circuit 7, described constant-current circuit 4, and voltage stabilizing, current stabilization are carried out in 4 pairs of described LED light source loads 3 of described constant-current circuit, described LED light source load 3 comprises one group of several LED that are in series, be LED 1～LED (n), the visual input voltage of number n of every group of LED being in series, the height of rated power, the big or small requirement of light illumination and determining, be generally 30～125, its basic calculating standard is n=90V/3V～300V/2.4V=30～125, described constant-current circuit 4 comprises one group of constant-current source device, this is organized described constant-current source device and comprises a depletion mode fet Q1, the drain electrode of described depletion mode fet Q1 is a contact, the source electrode of described depletion mode fet Q1 forms another contact with grid phase short circuit.
In the present embodiment, described temperature control protective circuit does not comprise filter capacitor, and the reactive power of circuit is significantly reduced, and the power factor (PF) of circuit of the present invention is greater than 0.85 after tested, can, up to 0.90, be therefore even a kind of High Power Factor LED drive circuit; When Rectified alternating current fluctuates within the specific limits, described constant-current source device can stop the fluctuation of electric current, keep constant current, make by the electric current of described LED light source load 3 more constant, and fluctuation voltage is added on described constant-current source device, thereby the function with voltage stabilizing, current stabilization, extends the useful life of described LED light source load 3, avoids burning.
Figure 10 is shown in by the current-voltage curve schematic diagram of LED under different temperatures.The characteristic of LED is under identical current conditions, and when temperature raises, the voltage at LED two ends can reduce.Although the reduction amplitude of each LED voltage is little, when up to a hundred LED are cascaded, the total voltage of LED light source part can reduce larger.When ambient temperature raises (as being greater than 40 ℃), even if at constant current environment, the total voltage at light source two ends also may decline about 10V, and the voltage of decline can be attached to the two ends of described constant-current source device, and the voltage at the two ends of described constant-current source device is raise.Fig. 9 is shown in by the characteristic of the constant-current source device of the present embodiment and the current-voltage curve schematic diagram while falling power.Voltage V between drain electrode and source electrode
dSbe greater than saturation voltage V
twhen (a point), the drain electrode of constant-current source device and the electric current I between source electrode
dSpresent the characteristic of constant current, general constant-current source device by real work voltage V
wdesign near b point, general V
w≈ V
t+ (3～5) V.When the voltage at the two ends of described constant-current source device raises with ambient temperature or when input voltage mutation raises, the working point of described constant-current source device can be mobile to c point by b point, the power consumption of described constant-current source device can increase, ambient temperature is further raise, when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS) F3, described the second normally closed temperature detect switch (TDS) F3 disconnects, disconnecting after-current passes through from described divider resistance Rt, the described divider resistance Rt resistance of design make its two ends share voltage (as 17V) be greater than as described in the working point of constant-current source device by b point the voltage (as 10V) to the when movement rising of c point, under the constant current effect of described constant-current source device, now the voltage at described constant-current source device two ends can further reduce, as than initialization lower voltage 7V, because the cut-in voltage of general described constant-current source device is 5V, now, the voltage reducing except the voltage LED light source of constant-current source is all absorbed by described divider resistance Rt, the both end voltage of described constant-current source device further reduces, if V
w=V
t+ 5V, the both end voltage of described constant-current source device can be reduced to than the saturation voltage in constant current district low 2V again, the working point of constant-current source device described in this process finally moves to by c point the linear district of unsaturation that d is ordered, now, the operating current of described constant-current source device diminishes, therefore the power of described constant-current source device and LED is all by step-down, in downrating state, therefore heating reduces, working temperature reduces, when working temperature drops to the break-off signal of described the second normally closed temperature detect switch (TDS) F3 when following, described the second normally closed temperature detect switch (TDS) F3 is Operating In Persistent Current Mode again, whole circuit is returned to normal operating conditions.
Embodiment bis-:
As shown in Fig. 2, Fig. 5, Fig. 6, Fig. 9, Figure 10; the difference part of the present embodiment and embodiment mono-is: in the present embodiment; described temperature control protective circuit also comprises filter circuit 2; after described filter circuit 2 is connected to described rectification circuit 1; filter circuit described in the present embodiment 2 comprises filter capacitor C1 and bleeder resistance R1; can certainly adopt other filter circuits; to offer the more stable electric current of described LED light source load 3; but owing to adding filter capacitor, so power factor can be under some influence.
All the other features of the present embodiment are identical with embodiment mono-.
Embodiment tri-:
As Fig. 3, shown in Fig. 7～Figure 10, the LED lamp with temperature control protective circuit of the present embodiment comprises power panel 101 and the temperature control protective circuit thereof that is used to LED light source power supply, be used to the radiator 102 of LED light source heat radiation, water proof and dust proof lampshade 103, reflection shield 104, airtight power pack 105 for the protection of described power panel 101 water proof and dust proofs, described temperature control protective circuit comprises alternating current is become to galvanic rectification circuit 1, LED light source load 3, for voltage stabilizing is carried out in described LED light source load 3, the constant-current circuit 4 of current stabilization, current foldback circuit 5, the first temperature switch circuit 6, the second temperature switch circuit 7, power lightning protection circuit 8, power supply EMC circuit 9, voltage stabilizing and pfc circuit 10, light source EMC circuit 11, described rectification circuit 1 adopts bridge rectifier to comprise rectifier bridge D1, can certainly adopt other rectifier system rectifications, described current foldback circuit 5 is connected to the input of power supply, described current foldback circuit 5 comprises overcurrent protection protective tube F1, when circuit overcurrent, described overcurrent protection protective tube F1 fusing, plays overcurrent and short-circuit protection effect, can certainly adopt other forms of current foldback circuit, described the first temperature switch circuit 6 is connected to the input of power supply, described the first temperature switch circuit 6 comprises the first normally closed temperature detect switch (TDS) F2, described the first normally closed temperature detect switch (TDS) F2 is loaded on described radiator 102, when described radiator 102 temperature are during higher than the break-off signal of described the first normally closed temperature detect switch (TDS) F2, described the first normally closed temperature detect switch (TDS) F2 disconnects, and cuts off the power supply of described LED light source load 3, after described power lightning protection circuit 8 is connected to described current foldback circuit 5 and described the first temperature switch circuit 6, for lightning protection, comprise capacitor C 2, piezo-resistance RV1, RV2, R2, temperature safety tube TH3, discharge tube DSA1, before described power supply EMC circuit 9 is connected to described rectification circuit 1, after described light source EMC circuit 11 is connected to described voltage stabilizing and pfc circuit 10, before described LED light source load 3, so that circuit meets EMC Requirements, described power supply EMC circuit 9 comprises resistance R 3, capacitor C 3～C5, transformer T1, negative tempperature coefficient thermistor NTC, described light source EMC circuit 11 comprises common mode inductance L1, L2, transformer T3, described voltage stabilizing and pfc circuit 10 are circuit of power factor correction, after being connected to described rectification circuit 1, before described LED light source load 3, be used to described LED light source load 3 that the direct current of voltage stabilization is provided, and improve the power factor of whole circuit, described voltage stabilizing and pfc circuit 10 are Switching Power Supplies, comprise power factor correction chip U1, described power factor correction chip U1 adopts the power supply PFC power factor control circuit that model is MC33262, it is simple that it has circuit, efficiency advantages of higher, its peripheral cell comprises capacitor C 6～C12, resistance R 4～R9, R12, diode D5, D6, metal-oxide-semiconductor Q1, transformer T2, described the second temperature switch circuit 7 comprises the second normally closed temperature detect switch (TDS) F3 and divider resistance R10 and the sampling resistor R11 in parallel with described the second normally closed temperature detect switch (TDS) F3, described the second normally closed temperature detect switch (TDS) F3 is loaded on the described power panel 101 in described power pack 105, described the second temperature switch circuit 7 is connected with the sampled voltage end A of the voltage output end B of described voltage stabilizing and pfc circuit 10, when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS) F3, described the second normally closed temperature detect switch (TDS) F3 disconnects, electric current passes through from described divider resistance R10, the voltage of described sampled voltage end A raises, for making the voltage of described sampled voltage end A, be down to balanced voltage, described power factor correction chip U1 regulates the lower voltage that makes described voltage output end B, the direct voltage of the voltage input end C of described LED light source load 3 equates with the VD of the voltage output end B of described voltage stabilizing and pfc circuit 10, therefore the input voltage of the voltage input end C of described LED light source load 3 reduces, supply power voltage and the electric current of described LED light source load 3 have been reduced simultaneously, reduced the power of LED light fixture, the break-off signal of described the first normally closed temperature detect switch (TDS) F2 is 70 ℃, the break-off signal scope of described the first normally closed temperature detect switch (TDS) F2 can be chosen to be a specified temp between 60～100 ℃, the break-off signal of described the second normally closed temperature detect switch (TDS) F3 is 80 ℃, the break-off signal scope of described the second normally closed temperature detect switch (TDS) F3 can be chosen to be a specified temp between 30～100 ℃, described LED light source load 3 comprises some groups of LED, i.e. LED 1a～LED (n) a, LED 1x～LED (n) x, is in parallel between each group, comprises the LED that several are in series in each group, the visual input voltage of number n of every group of LED being in series, the height of rated power, the big or small requirement of light illumination and determining, described constant-current circuit 4 comprises some groups of constant-current source devices, described in every group, constant-current source device comprises a depletion mode fet Qa, Qx, depletion mode fet Qa described in each, the drain electrode of Qx is a contact, depletion mode fet Qa described in each, the source electrode of Qx forms another contact with grid phase short circuit, described in every group, constant-current source device is in series and is connected with one group of LED in described LED light source load 3, so that every group of LED can obtain stable operating current, avoid overcurrent to burn, increase the service life, certainly, described in every group, constant-current source device also can comprise a plurality of depletion mode fets, described in every group, constant-current source device also can be in series and be connected with the many groups LED after parallel connection, and described in every group, constant-current source device comprises a depletion mode fet Qa, Qx, depletion mode fet Qa described in each, the drain electrode of Qx is a contact, depletion mode fet Qa described in each, the source electrode of Qx forms another contact with grid phase short circuit, and described in every group, constant-current source device is in series and is connected with one group of LED in described LED light source load 6, so that every group of LED can obtain stable operating current, avoids overcurrent to burn, and increases the service life, described in every group, constant-current source device is depletion mode fet Qa, Qx all and be connected with the first voltage stabilizing didoe Da, Dx, described the first voltage stabilizing didoe Da, the voltage stabilizing working point of Dx can be chosen to be certain specific voltage between 20～80V DC according to the factors such as situation of the watt level of light fixture and side circuit, make the voltage control of described constant-current source device within the specific limits, it is too high that the switching surge of avoiding a plurality of light fixtures simultaneously to open generation impacts the instantaneous voltage causing, minimizing impacts constant-current source, avoid constant-current source device to damage, guarantee the stable operation of whole circuit, therefore there is the over-voltage protecting function of constant-current source device.
Figure 10 is shown in by the current-voltage curve schematic diagram of LED under different temperatures.The characteristic of LED is under identical current conditions, and when temperature raises, the voltage at LED two ends can reduce.Although the reduction amplitude of each LED voltage is little, when a plurality of LED are cascaded, the total voltage of LED light source part can reduce larger.When ambient temperature raises, even if at constant current environment, the total voltage at light source two ends also may decline larger, and the voltage of decline can be attached to the two ends of described constant-current source device, and the voltage at the two ends of described constant-current source device is raise.Fig. 9 is shown in by the characteristic of the constant-current source device of the present embodiment and the current-voltage curve schematic diagram while falling power.Voltage V between drain electrode and source electrode
dSbe greater than saturation voltage V
twhen (a point), the drain electrode of constant-current source device and the electric current I between source electrode
dSpresent the characteristic of constant current, general constant-current source device by real work voltage V
wdesign near b point, general V
w≈ V
t+ (3～5) V, therefore when the voltage at the two ends of described constant-current source device raises with ambient temperature or during input voltage mutation rising, the working point of described constant-current source device can be mobile to c point by b point, and described constant-current source device of the present invention can be avoided LED current break, keeps constant current.Work as V
dSbe less than saturation voltage V
twhen (a point), I
dSwith V
dSdiminish and diminish gradually, when described the second normally closed temperature detect switch (TDS) F3 disconnects, electric current passes through from described divider resistance R10, adjusting by described power factor correction chip U1 reduces the input voltage of the output voltage of described voltage output end B and the voltage input end C of described LED light source load 3, the dividing potential drop of described constant-current source device is reduced, when being reduced to V
dSbe less than saturation voltage V
ttime, I
dSdiminish, therefore the supply current of described LED light source load 3 reduces thereupon, and now the working point of constant-current source device is positioned at d point, so the power of constant-current source device also reduces thereupon.
Embodiment tetra-:
As Fig. 4, shown in Fig. 7～Figure 10, the difference part of the present embodiment and embodiment tri-is: in the present embodiment, described temperature control protective circuit also comprises radiator fan motor 12 (Fig. 7, in Fig. 8, radiator fan is not shown), fan protection circuit 13, described fan protection circuit 13 is in parallel with described radiator fan motor 12, described fan protection circuit 13 comprises three mutual fan shunt resistance R13 in parallel and the second voltage stabilizing didoe Dfan in parallel with described fan shunt resistance R13, the described fan shunt resistance R13 of a plurality of mutual parallel connections is for the shunting of high-power circuit, the high temperature of avoiding single resistance to bring, the voltage stabilizing working point of described the second voltage stabilizing didoe Dfan is a specific voltage between 5～24V DC, by described the second voltage stabilizing didoe Dfan is set, make the voltage control of described radiator fan motor 12 within the specific limits, it is too high that the switching surge of avoiding a plurality of light fixtures simultaneously to open generation impacts the instantaneous voltage causing, avoid radiator fan motor 12 to impact, avoid fan to damage, guarantee the heat radiation stable operation of whole circuit, therefore there is fan over-voltage protecting function.
All the other features of the present embodiment are identical with embodiment tri-.
Above embodiment is only to exemplary explanation of the present invention, is not limiting to the claimed invention.
The characteristic that when the present invention has utilized constant-current source voltage to raise, current stabilization and lower voltage electric current when lower than saturation voltage reduces; coordinate temperature detect switch (TDS); realized and when high temperature, reduced LED electric current and power; thereby guarantee the function that LED lamp can be worked and LED itself do not damaged when higher temperature; having realized to the full extent the dual needs of illumination functions and autoprotection, is the breakthrough of LED illumination under extreme industrial and mineral.
The present invention can be widely used in LED lighting field.
Claims (10)
1. the LED lamp with temperature control protective circuit, comprise the power panel (101) and the temperature control protective circuit thereof that are used to LED light source power supply, be used to the radiator (102) of LED light source heat radiation, described temperature control protective circuit comprises alternating current is become to galvanic rectification circuit (1), LED light source load (3), for voltage stabilizing is carried out in described LED light source load (3), the constant-current circuit of current stabilization (4), it is characterized in that: described temperature control protective circuit also comprises the first temperature switch circuit (6), the second temperature switch circuit (7), described the first temperature switch circuit (6) is connected to the input of power supply, described the first temperature switch circuit (6) comprises the first normally closed temperature detect switch (TDS) (F2), described the first normally closed temperature detect switch (TDS) (F2) is loaded on described radiator (102), when described radiator (102) temperature is during higher than the break-off signal of described the first normally closed temperature detect switch (TDS) (F2), described the first normally closed temperature detect switch (TDS) (F2) disconnects, cut off the power supply of described LED light source load (3), described the second temperature switch circuit (7) comprises the second normally closed temperature detect switch (TDS) (F3) and the divider resistance in parallel with described the second normally closed temperature detect switch (TDS) (F3), described the second normally closed temperature detect switch (TDS) (F3) is loaded on described power panel (101), when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS) (F3), described the second normally closed temperature detect switch (TDS) (F3) disconnects, electric current passes through from described divider resistance, to reduce the supply current of described LED light source load (3), the break-off signal of described the first normally closed temperature detect switch (TDS) (F2) is a specified temp between 60～100 ℃, and the break-off signal of described the second normally closed temperature detect switch (TDS) (F3) is a specified temp between 30～100 ℃, described temperature control protective circuit also comprises voltage stabilizing and pfc circuit (10), described voltage stabilizing and pfc circuit (10) are connected to described rectification circuit (1) afterwards, described the second temperature switch circuit (7) is connected with the sampled voltage end (A) of the voltage output end (B) of described voltage stabilizing and pfc circuit (10), when circuit ambient temperature is during higher than the break-off signal of described the second normally closed temperature detect switch (TDS) (F3), described the second normally closed temperature detect switch (TDS) (F3) disconnects, electric current passes through from described divider resistance (R10), the output voltage of the voltage output end (B) of described voltage stabilizing and pfc circuit (10) reduces, and reduce the input voltage of the voltage input end (C) of described LED light source load (3).
2. the LED lamp with temperature control protective circuit according to claim 1, it is characterized in that: described LED light source load (3) comprises at least one group of several LED that are in series, described constant-current circuit (4) comprises at least one group of constant-current source device, described in every group, constant-current source device is in series and is connected with at least one group of LED in described LED light source load (3), described in every group, constant-current source device comprises at least one depletion mode fet, the drain electrode of described depletion mode fet is a contact, the source electrode of described depletion mode fet forms another contact with grid phase short circuit.
3. the LED lamp with temperature control protective circuit according to claim 2, is characterized in that: described in every group, all and be connected with the first voltage stabilizing didoe, the voltage stabilizing working point of described the first voltage stabilizing didoe is a specific voltage between 20～80VDC to constant-current source device.
4. the LED lamp with temperature control protective circuit according to claim 1, is characterized in that: described temperature control protective circuit also comprises filter circuit (2), and described filter circuit (2) is connected to described rectification circuit (1) afterwards.
5. the LED lamp with temperature control protective circuit according to claim 1, is characterized in that: described the second temperature switch circuit (7) is in series and is connected with described LED light source load (3).
6. the LED lamp with temperature control protective circuit according to claim 1; it is characterized in that: described temperature control protective circuit also comprises current foldback circuit (5); described current foldback circuit (5) is connected to the input of power supply, and described current foldback circuit (5) comprises overcurrent protection protective tube (F1).
7. the LED lamp with temperature control protective circuit according to claim 6; it is characterized in that: described temperature control protective circuit also comprises power lightning protection circuit (8), described power lightning protection circuit (8) is connected to described current foldback circuit (5) and described the first temperature switch circuit (6) afterwards.
8. the LED lamp with temperature control protective circuit according to claim 1, is characterized in that: described temperature control protective circuit also comprises power supply EMC circuit (9), and described power supply EMC circuit (9) is connected to described rectification circuit (1) before.
9. the LED lamp with temperature control protective circuit according to claim 1, is characterized in that: described temperature control protective circuit also comprises light source EMC circuit (11), and described light source EMC circuit (11) is connected to described LED light source load (3) before.
10. the LED lamp with temperature control protective circuit according to claim 1, it is characterized in that: described temperature control protective circuit also comprises radiator fan motor (12), fan protection circuit (13), described fan protection circuit (13) is in parallel with described radiator fan motor (12), described fan protection circuit (13) comprises at least one fan shunt resistance (R13) and second voltage stabilizing didoe (Dfan) in parallel with described fan shunt resistance (R13), the voltage stabilizing working point of described the 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 |
| US14/233,697 US8878463B2 (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 |
| EP12785251.5A EP2712278A4 (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 CN102387638A (en) | 2012-03-21 |
| CN102387638B true CN102387638B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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| CN (1) | CN102387638B (en) |
Families Citing this family (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 |
| 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 |
| 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 |
| CN114721461B (en) * | 2022-04-27 | 2023-07-18 | 华荣科技股份有限公司 | Irradiation-resistant dual-protection constant current source circuit |
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