CN110381637A - A kind of thermal-shutdown circuit and LED lamp - Google Patents
A kind of thermal-shutdown circuit and LED lamp Download PDFInfo
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- CN110381637A CN110381637A CN201910663315.7A CN201910663315A CN110381637A CN 110381637 A CN110381637 A CN 110381637A CN 201910663315 A CN201910663315 A CN 201910663315A CN 110381637 A CN110381637 A CN 110381637A
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of thermal-shutdown circuit and LED lamps; the thermal-shutdown circuit includes: the control circuit module for adjusting the variable quantity of output electric current according to adjustment parameter predetermined during overheat protector, and the variable quantity of output electric current is controlled by the first control terminal；For detecting the temperature variation of load place circuit and according to the temperature detecting module of temperature variation generation control logic signal, pass through output end output control logic signal；Drive module has the second control terminal, input terminal and controlled terminal; input terminal is electrically connected with output end; controlled terminal is electrically connected with the first control terminal; second control terminal is electrically connected with load circuit; wherein; the variable quantity for the output electric current that drive module is obtained by controlled terminal and the control logic signal of input terminal input; the current curve slope of load circuit is controlled by the second control terminal, thermal-shutdown circuit provided in an embodiment of the present invention can match the current curve slope of application conditions adjustment load circuit.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of thermal-shutdown circuit and LED lamps.
Background technique
With the continuous development of LED lamp, the requirement of the market to the reliability and quality of LED lamp also the next high.But
The cost of LED lamp is but constantly reducing, and the reliability and quality to LED lamp propose huge challenge；It is well known that shadow
Sound LED lamp service life maximum two influence factors are the service life of LED lamp bead and LED driver, but these devices
Service life is influenced very big by environment temperature.Therefore, how to prevent LED lamp bead and the temperature of LED driver excessively high most important.
Currently, the curve of LED current variation is substantially internal fixed, Wu Fagen in existing thermal-shutdown circuit scheme
Programmable regulation is carried out according to the applicable cases of different lamps, this causes the light output quality of LED lamp effectively not optimize and mention
Height, while being unable to control the excess temperature dimming curve of the LED in the case where triggering over-temperature condition.
Summary of the invention
The embodiment of the present invention provides a kind of thermal-shutdown circuit and LED lamp, for solving existing thermal-shutdown circuit
The problem of current curve of load circuit can not being adjusted according to application conditions.
The embodiment of the present invention adopts the following technical solutions:
In a first aspect, the present invention provides a kind of thermal-shutdown circuits, comprising:
Control circuit module is configured to adjust output according to adjustment parameter predetermined during overheat protector
The variable quantity of electric current has the first control terminal, and the variable quantity of the output electric current is controlled by first control terminal；
Temperature detecting module is configured to the temperature variation of detection load place circuit and according to the temperature variation
Control logic signal is generated, exports the control logic signal with output end, and by the output end；
Drive module, has the second control terminal, input terminal and controlled terminal, and the input terminal is electrically connected with the output end
It connecing, the controlled terminal is electrically connected with first control terminal, and second control terminal is electrically connected with the load circuit,
In,
What the variable quantity and the input terminal for the output electric current that the drive module is obtained by the controlled terminal inputted
Control logic signal controls the curent change of the load circuit by second control terminal, to control the load circuit
Current curve slope.
Further, the drive module has MOS transistor, the drain electrode of the MOS transistor and the load circuit
Electrical connection；
The drive module passes through the duration for driving the on or off of the MOS transistor, and according to the MOS crystal
The conducting duration of pipe and the ratio of shutdown duration, to control the curent change of the load circuit, to control the load circuit
Current curve slope.
Further, the drive module includes: first comparator, the second comparator, current mirror, switching tube, the first electricity
Appearance, first resistor, sampling resistor, logic control element and driving signal processing unit；Wherein,
The first input end of the first comparator is electrically connected the first reference voltage, the second input of the first comparator
End, the drain electrode of the switching tube, one end of the first capacitor and the current mirror one end be electrically connected the first tie point, it is described
The output end of first comparator is electrically connected the delay incoming end of the logic control element；
The first input end of second comparator is electrically connected the second reference voltage, the second input of second comparator
The control terminal at end, the other end of the current mirror and the control circuit module is electrically connected the second tie point；
First output end of the logic control element is electrically connected one end of the first resistor, the first resistor it is another
One end is electrically connected the grid of the switching tube, and the second output terminal electrical connection driving signal processing of the logic control element is single
Member, the driving signal processing unit are electrically connected the grid of the MOS transistor, and the source electrode of the MOS transistor is adopted with described
One end of sample resistance is electrically connected, the other end ground connection of the sampling resistor；
Wherein, output signal and other control logic signal of the logic control element according to the first comparator
The driving signal of generation, and the driving signal is issued into the driving signal processing unit, the driving signal processing unit
Driving instruction is generated according to the driving signal, to drive the MOS transistor on or off.
Further, the drive module includes: constant-current driven chip, second resistance, 3rd resistor and the 4th resistance；Its
In,
1st foot of the constant-current driven chip is electrically connected voltage source negative pole, and the 2nd foot is electrically connected the one of the 4th resistance
End, the triggering starting point voltage value of output open circuit voltage is arranged, the 3rd foot is electrically connected the control terminal of the control circuit module,
To adjust the change of output electric current according to adjustment parameter predetermined by the control circuit module under the conditions of overheat protector
Change amount controls the current curve slope of load circuit, and the 4th foot is electrically connected the voltage source anode, the 5th foot electrical connection load electricity
Road, the 6th foot are electrically connected one end of the second resistance, with control flow through external inductors electric current peak inrush current value, the 7th
Foot is electrically connected one end of the 3rd resistor, to control the starting point temperature value that overheat protector is triggered, the second resistance
The other end of the other end, the other end of the 3rd resistor and the 4th resistance is electrically connected the voltage source anode.
Further, the control circuit module include: capacitor adjustable module and/or resistance adjustable module and/or
Voltage adjustable module；Wherein,
One end of the capacitor adjustable module is electrically connected with the controlled terminal of the drive module, and the capacitor is adjustable
The other end of module is grounded；
One end of the resistance adjustable module is electrically connected with the controlled terminal of the drive module, and the resistance is adjustable
The other end of module is grounded；
One end of the voltage adjustable module is electrically connected with the controlled terminal of the drive module, and the voltage is adjustable
The other end of module is grounded.
Further, the resistance adjustable module includes: adjustable resistor；
One end of the adjustable resistor is electrically connected with the controlled terminal of the drive module, the adjustable resistor it is another
One end ground connection.
Further, the resistance adjustable module includes: the second capacitor, second capacitor and the adjustable resistor
It is in parallel.
Second aspect, the present invention provides a kind of LED lamps comprising thermal-shutdown circuit described above, the first electricity
Sense, first diode and load circuit；
One end of the load circuit connect third tie point with the cathode of the first diode, the load circuit
The other end connect the 5th tie point, the other end, the overheat protector electricity of first inductance with one end of first inductance
Anode the 4th tie point of connection on road and the first diode.
Further, the load circuit includes at least one LED light and the 5th resistance, at least one described LED light string
Connection composition LED light group, one end of the LED light group, the 5th resistance one end connect the third tie point, the LED
Other end connection the 5th tie point of the other end of lamp group, the 5th resistance.
Further, the load circuit includes:
One end of third capacitor, the third capacitor is electrically connected the third tie point, the other end of the third capacitor
It is electrically connected the 5th tie point.
Further, at least one described LED light includes: bulb lamp, floodlight tube or panel light.
At least one above-mentioned technical solution used in the embodiment of the present invention can reach it is following the utility model has the advantages that
Thermal-shutdown circuit provided in an embodiment of the present invention comprising control circuit module, temperature detecting module and driving
First control terminal of module, control circuit module is electrically connected with the controlled terminal of drive module, the output end of temperature detecting module
It is electrically connected with the input terminal of drive module, the second control terminal of drive module is electrically connected with load circuit.Wherein, control circuit mould
Block during overheat protector according to adjustment parameter predetermined for adjusting the variable quantity of output electric current, temperature detection mould
The temperature variation of circuit where block is used to detect load, and control logic signal, drive module are generated according to temperature variation
The control logic signal that the variable quantity and input terminal of the output electric current obtained by controlled terminal input, passes through the second control terminal control
The current curve slope of load circuit processed.Therefore, thermal-shutdown circuit provided in an embodiment of the present invention can match application conditions tune
The current curve slope of whole load circuit.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram of thermal-shutdown circuit provided in an embodiment of the present invention；
Fig. 2 be it is provided in an embodiment of the present invention it is a kind of connect load circuit thermal-shutdown circuit structural schematic diagram it
One；
Fig. 3 is a kind of structural schematic diagram of the part with thermal-shutdown circuit provided in an embodiment of the present invention；
Fig. 4 be it is provided in an embodiment of the present invention it is a kind of connect load circuit thermal-shutdown circuit structural schematic diagram it
Two；
Fig. 5 is a kind of LED light current curve slope variation figure with thermal-shutdown circuit provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
As shown in Figure 1, thermal-shutdown circuit provided in an embodiment of the present invention include: for during overheat protector according to
Adjustment parameter predetermined come adjust output electric current variable quantity control circuit module 10, for detect load where circuit
Temperature temperature variation and according to temperature variation generate control logic signal temperature detecting module 20 and drive module
30.Wherein, circuit where load can refer to the circuit comprising load, such as comprising the circuit of LED light.Individually below to control circuit
Connection and work relationship between module 10, temperature detecting module 20 and drive module 30 are illustrated, in conjunction with Fig. 1 and Fig. 2 institute
Show, specific as follows:
The control circuit module 10 has the first control terminal 11, and passes through the variation of the first control terminal 11 control output electric current
Amount, what the variable quantity of the output electric current was obtained according to adjustment parameter predetermined, wherein adjustment parameter may include adjusting electricity
Pressure adjusts resistance or adjusts capacitor.The specific implementation circuit of the control circuit module 10 can be the circuit of resistance transformation,
Or the circuit of voltage pressure value transformation, it can also be the circuit of capacitor's capacity transformation, for example, the electricity comprising slide rheostat
Road.
The temperature detecting module 20 has output end 21, and by 21 output control logic signal of output end, which is patrolled
Collect what signal was obtained according to the temperature variation of circuit where load.The specific implementation circuit of the temperature detecting module 20 can be
With temperature detection device and it can be carried out the circuit that temperature variation handled.For example, having the device sensitive to environment temperature
The circuit of part or temperature sensor.
The drive module 30 has the second control terminal 31, input terminal 33 and controlled terminal 32, input terminal 33 and output end 21
Electrical connection, controlled terminal 32 are electrically connected with the first control terminal 11, and the second control terminal 31 is electrically connected with load circuit 40, wherein are driven
The control logic signal that the variable quantity and input terminal 33 for the output electric current that dynamic model block 30 is obtained by controlled terminal 32 input, passes through
The current curve slope of second control terminal 31 control load circuit 40.Specifically, drive module 30 can have MOS transistor
The drain D of Q101, MOS transistor Q101 are electrically connected with load circuit 40, and drive module 30 is obtained defeated by controlled terminal 32
The control logic signal that the variable quantity of electric current and input terminal 33 input out, drive the on or off of MOS transistor Q101 when
It is long, and according to the ratio of the conducting duration of MOS transistor Q101 and shutdown duration, to control the curent change of load circuit 40,
To control the current curve slope of the load circuit 40, as shown in Figure 5.
Thermal-shutdown circuit provided in an embodiment of the present invention comprising control circuit module, temperature detecting module and driving
First control terminal of module, control circuit module is electrically connected with the controlled terminal of drive module, the output end of temperature detecting module
It is electrically connected with the input terminal of drive module, the second control terminal of drive module is electrically connected with load circuit.Wherein, control circuit mould
Block during overheat protector according to adjustment parameter predetermined for adjusting the variable quantity of output electric current, temperature detection mould
The temperature variation of circuit where block is used to detect load, and control logic signal, drive module are generated according to temperature variation
The control logic signal that the variable quantity and input terminal of the output electric current obtained by controlled terminal input, passes through the second control terminal control
The current curve slope of load circuit processed.Therefore, thermal-shutdown circuit provided in an embodiment of the present invention can match application conditions tune
The current curve slope of whole load circuit.
Optionally, drive module 30 described in above-described embodiment can be realized using following circuits:
In conjunction with shown in Fig. 2 and Fig. 3, the first realizes circuit, comprising: first comparator U201, the second comparator U202, electricity
Flow mirror M201, switching tube Q201, first capacitor C201, first resistor Rgate, sampling resistor R1 (as shown in Figure 2), logic control
Unit and driving signal processing unit；As shown in figure 3, the first input end of first comparator U201 is electrically connected the first benchmark electricity
Pressure, the second input terminal of first comparator U201, the drain D of switching tube Q201, one end of first capacitor C201 and current mirror
One end of M201 is electrically connected the first tie point 1, and the delay of the output end electrical connection logic control element of first comparator U201 connects
Enter end；First input end the second reference voltage of electrical connection of second comparator U202, the second input terminal of the second comparator U202,
The other end of current mirror M201 and the control terminal of control circuit module 10 are electrically connected the second tie point 2；Logic control element it is defeated
Enter end 33 to be electrically connected with the output end 21 of temperature detecting module, the first output end of logic control element is electrically connected first resistor
One end of Rgate, the grid G of the other end electrical connection switching tube Q201 of first resistor Rgate, the second of logic control element are defeated
Outlet is electrically connected driving signal processing unit, and driving signal processing unit is electrically connected the grid G of MOS transistor Q101, MOS crystal
The source S of pipe Q101 is electrically connected with one end of sampling resistor R1, the other end ground connection of sampling resistor R1；
Wherein, logic control element according to the output signal of first comparator U201 and other control logic signals (such as
The control logic signal that temperature detecting module generates) driving signal that generates, and it is single that driving signal issued driving signal processing
Member, driving signal processing unit generates driving instruction according to driving signal, to drive MOS transistor Q101 on or off.
Assuming that control circuit module 10 is variable resistance, as shown in figure 3, control circuit module 10 and drive module 30 are mutual
The specific work process of cooperation are as follows: after the first inductance L101 charging terminates to enter freewheeling cycle, switching tube Q201 is connected immediately,
First capacitor C201 is short-circuited, and it is that next charge cycle is prepared that first capacitor C201, which is discharged rapidly to resetting,；When the first electricity
Sense L101 freewheeling cycle terminates, i.e., when the first inductance L101 is discharged to zero, switching tube Q201 is turned off, in this stage MOS crystal
Pipe Q101 maintains off-state, and first capacitor C201 is started to charge, can power transformation according to circuit adjustment parameter adjusting predetermined
Resistance, when reducing the resistance value of variable resistance, the both ends electric current of current mirror M201 becomes larger, the first electricity connecting with current mirror M201
The rate that appearance C201 charges becomes faster, charging duration reduces, conversely, variable resistance resistance value increases, first capacitor C201 charging
Rate becomes faster, and charging duration increases, when the charging voltage of first capacitor C201 reaches the reference voltage of first comparator U201,
First comparator U201 exports time delayed signal and is transformed into high level by low level, and is transferred to logic control element, logic control
Unit is according to the time delayed signal of first comparator U201 and other logical signals (control logic that such as temperature detecting module generates
Signal), it generates driving signal and driving signal is issued into driving signal processing unit, driving signal processing unit is believed according to driving
Number generate driving instruction, enter on state to control MOS transistor Q101, the first inductance L101 is started to charge at this time, switch
Pipe Q201, which is in, continues off state, and the output time delayed signal of first comparator U201 remains high level；When the first inductance
L101 charging terminates after entering freewheeling cycle, and switching tube Q201 is connected immediately, is repeated with this.Therefore, the embodiment of the present invention provides
The first realize circuit by adjust variable resistance change in resistance amount with control MOS transistor Q101 conducting and disconnect duration
Ratio, to change the size of current of load circuit 40.
Second of realization circuit, comprising: constant-current driven chip U1, second resistance R2,3rd resistor R3 and the 4th resistance R4；
As shown in figure 4, the cathode of the 1st foot GND electrical connection voltage source Vin of constant-current driven chip U1, the 4th electricity of the 2nd foot ROVP electrical connection
One end of R4 is hindered, the triggering starting point voltage value of output open circuit voltage is arranged, the 3rd foot RLED is electrically connected control circuit module 10
Control terminal, under the conditions of overheat protector pass through control circuit module 10 according to adjustment parameter predetermined adjust output electricity
The variable quantity of stream controls the current curve slope of load circuit 40, and the 4th foot VIN is electrically connected voltage source Vin anode, the 5th foot DRA
It is electrically connected one end of the 40, the 6th foot CS of load circuit electrical connection second resistance R2, to control the maximum for the electric current for flowing through external inductors
Peak current value, the 7th foot RTH is electrically connected one end of 3rd resistor R3, to control the starting point temperature value that overheat protector is triggered,
The other end electrical connection voltage source Vin anode of the other end of second resistance R2, the other end of 3rd resistor R3 and the 4th resistance R4.
Wherein, constant-current driven chip U1 is the working principle realized that circuit integration obtains by the first, therefore realize circuit for second
The working principle of circuit is realized with the first, as shown in Fig. 2, when MOS transistor Q101 conducting, the electric current I of LED lightLEDPass through
First inductance L101 flows through one end of sampling resistor R1, the pressure drop generated on sampling resistor R1 are as follows: VCS=2*R1*ILED, by
This voltage VCS generated is detected by the 6th foot CS of constant-current driven chip U1 to be subsequently used for and the benchmark of internal comparator electricity
Pressure is compared, so that the duration of the turn-on cycle of inner MOS transistors Q101 is controlled, to change the electric current of load circuit 40
Size.
Optionally, control circuit module 10 described in above-described embodiment may include: capacitor adjustable module and/or electricity
Hinder adjustable module and/or voltage adjustable module；Wherein, one end of capacitor adjustable module and drive module 30 are controlled
End electrical connection, the other end ground connection of capacitor adjustable module；One end of resistance adjustable module is controlled with drive module 30
End electrical connection, the other end ground connection of resistance adjustable module；One end of voltage adjustable module is controlled with drive module 30
End electrical connection, the other end ground connection of voltage adjustable module.
When it is implemented, resistance adjustable module may include: adjustable resistor RLED, adjustable resistor RLEDOne end with
The controlled terminal of drive module 30 is electrically connected, adjustable resistor RLEDThe other end ground connection.Preferably, in order to filter out adjustable economize on electricity
Hinder RLEDSignal interference, resistance adjustable module includes: the second capacitor C2, the second capacitor C2 and adjustable resistor RLEDIt is in parallel.
In conjunction with shown in Fig. 2 to Fig. 5, LED lamp provided in an embodiment of the present invention may include: thermal-shutdown circuit, first
Inductance L101, first diode D101 and load circuit 40.Individually below to the connection of thermal-shutdown circuit and load circuit 40
Relationship, work relationship are described in detail, specific as follows:
One end of the load circuit 40 connect third tie point 3 with the cathode of first diode D101, load circuit 40
The other end connect the 5th tie point 5 with one end of the first inductance L101, the other end of the first inductance L101, thermal-shutdown circuit and
Anode the 4th tie point 4 of connection of first diode D101.
Wherein, which may include at least one LED light and the 5th resistance R5, the series connection of at least one LED light
Form LED light group, one end of LED light group, the 5th resistance R5 one end connect third tie point 3, the other end of LED light group, the
The other end of five resistance R5 connects the 5th tie point 5.Preferably, described above in order to filter out the ripple current of LED light group
Load circuit 40 may include: third capacitor C3, one end of third capacitor C3 is electrically connected third tie point 3, third capacitor C3
The other end be electrically connected the 5th tie point 5.The embodiment of the present invention can filter out the ripple of LED light group by the way that third capacitor C3 is arranged
Electric current realizes the sudden strain of a muscle of LED light group low frequency or the high-quality light output efficiency without stroboscopic.
Wherein, at least one LED light includes: bulb lamp, floodlight tube or panel light.Certainly, at least one LED light can be with
Including other types lamp in the prior art, the embodiment of the present invention is not especially limited.
The thermal-shutdown circuit uses foregoing invention thermal-shutdown circuit as described in the examples, as shown in connection with fig. 1, the mistake
Temperature protection circuit may include: for adjusting output electric current according to adjustment parameter predetermined during overheat protector
The control circuit module 10 of variable quantity, for detecting the temperature variation of load place circuit and generating control according to temperature variation
The temperature detecting module 20 and drive module 30 of logical signal processed.Individually below to control circuit module 10, temperature detecting module
Connection and work relationship between 20 and drive module 30 are illustrated, referring to figs. 1 and 2, specific as follows:
The control circuit module 10 has the first control terminal 11, and passes through the variation of the first control terminal 11 control output electric current
Amount, what the variable quantity of the output electric current was obtained according to adjustment parameter predetermined, wherein adjustment parameter may include adjusting electricity
Pressure adjusts resistance or adjusts capacitor.The specific implementation circuit of the control circuit module 10 can be the circuit of resistance transformation,
Or the circuit of voltage pressure value transformation, it can also be the circuit of capacitor's capacity transformation, for example, the electricity comprising slide rheostat
Road.
The temperature detecting module 20 has output end 21, and by 21 output control logic signal of output end, which is patrolled
Collect what signal was obtained according to the temperature variation of circuit where load.The specific implementation circuit of the temperature detecting module 20 can be
With temperature detection device and it can be carried out the circuit that temperature variation handled.For example, having the device sensitive to environment temperature
The circuit of part or temperature sensor.
The drive module 30 has the second control terminal 31, input terminal 33 and controlled terminal 32, input terminal 33 and output end 21
Electrical connection, controlled terminal 32 are electrically connected with the first control terminal 11, and the second control terminal 31 is electrically connected with load circuit 40, wherein are driven
The control logic signal that dynamic model block 30 is inputted by the variable quantity and input terminal 33 of the output electric current obtained by 32 ends of control, passes through
The current curve slope of second control terminal 31 control load circuit 40.Specifically, drive module 30 can have MOS transistor
The drain D of Q101, MOS transistor Q101 are electrically connected with load circuit 40, and drive module 30 is obtained defeated by controlled terminal 32
The control logic signal that the variable quantity of electric current and input terminal 33 input out, drive the on or off of MOS transistor Q101 when
It is long, and according to the ratio of the conducting duration of MOS transistor Q101 and shutdown duration, to control the curent change of load circuit 40,
To control the current curve slope of the load circuit 40, as shown in Figure 5.
Certainly, which can also include other electrical parts, the phase being specifically detailed in foregoing invention embodiment
Hold inside the Pass, the embodiment of the present invention repeats no more.
For the embodiment of the present invention by setting thermal-shutdown circuit, which includes control circuit module, temperature
First control terminal of detection module and drive module, control circuit module is electrically connected with the controlled terminal of drive module, temperature inspection
The output end for surveying module is electrically connected with the input terminal of drive module, and the second control terminal of drive module is electrically connected with load circuit.
Wherein, control circuit module during overheat protector according to adjustment parameter predetermined for adjusting the change of output electric current
Change amount, the temperature variation of circuit where temperature detecting module is used to detect load, and control is generated according to temperature variation and is patrolled
Signal is collected, the control logic signal that the variable quantity for exporting electric current and input terminal that drive module is obtained by controlled terminal input,
The current curve slope of load circuit is controlled by the second control terminal.Therefore, thermal-shutdown circuit provided in an embodiment of the present invention
The current curve slope of application conditions adjustment load circuit can be matched, meanwhile, it realizes under different LED lamp application conditions,
The dimming curve effect that the change curve of the output electric current of load circuit can be optimal, not only increases the reality of LED lamp
The reliability of border application, while also improving the excellent optical quality effect of LED lamp during overheat protector.
It will be understood by those skilled in the art that although preferred embodiments of the present invention have been described, but skill in the art
Art personnel once know basic creative concept, then additional changes and modifications may be made to these embodiments.So appended
Claim is intended to be construed to include preferred embodiment and all change and modification for falling into the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from model of the invention by those skilled in the art
It encloses.In this way, if these modifications and changes of the present invention is within the scope of the claims of the present invention and its equivalent technology, then
The present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of thermal-shutdown circuit characterized by comprising
Control circuit module is configured to adjust output electric current according to adjustment parameter predetermined during overheat protector
Variable quantity, have the first control terminal, and by first control terminal control it is described export electric current variable quantity；
Temperature detecting module, the temperature variation of circuit where being configured to detection load are simultaneously generated according to the temperature variation
Control logic signal exports the control logic signal with output end, and by the output end；
Drive module has the second control terminal, input terminal and controlled terminal, and the input terminal is electrically connected with the output end, institute
It states controlled terminal to be electrically connected with first control terminal, second control terminal is electrically connected with the load circuit, wherein
The variable quantity for the output electric current that the drive module is obtained by the controlled terminal and the control of input terminal input
Logical signal controls the curent change of the load circuit by second control terminal, to control the electricity of the load circuit
Flow curve slope.
2. thermal-shutdown circuit according to claim 1, which is characterized in that the drive module has MOS transistor, institute
The drain electrode for stating MOS transistor is electrically connected with the load circuit；
The drive module passes through the duration for driving the on or off of the MOS transistor, and according to the MOS transistor
Duration is connected and turns off the ratio of duration, to control the curent change of the load circuit, to control the electricity of the load circuit
Flow curve slope.
3. thermal-shutdown circuit according to claim 2, which is characterized in that the drive module include: first comparator,
At second comparator, current mirror, switching tube, first capacitor, first resistor, sampling resistor, logic control element and driving signal
Manage unit；Wherein,
First input end the first reference voltage of electrical connection of the first comparator, the second input terminal of the first comparator,
One end of the drain electrode of the switching tube, one end of the first capacitor and the current mirror is electrically connected the first tie point, and described the
The output end of one comparator is electrically connected the delay incoming end of the logic control element；
First input end the second reference voltage of electrical connection of second comparator, the second input terminal of second comparator,
The control terminal of the other end of the current mirror and the control circuit module is electrically connected the second tie point；
First output end of the logic control element is electrically connected one end of the first resistor, the other end of the first resistor
It is electrically connected the grid of the switching tube, the second output terminal of the logic control element is electrically connected driving signal processing unit, institute
State the grid that driving signal processing unit is electrically connected the MOS transistor, the source electrode and the sampling resistor of the MOS transistor
One end electrical connection, the sampling resistor the other end ground connection；
Wherein, the logic control element is generated according to the output signal and other control logic signals of the first comparator
Driving signal, and the driving signal is issued into the driving signal processing unit, the driving signal processing unit according to
The driving signal generates driving instruction, to drive the MOS transistor on or off.
4. thermal-shutdown circuit described in any one of claim 1 to 3, which is characterized in that the drive module includes:
Constant-current driven chip, second resistance, 3rd resistor and the 4th resistance；Wherein,
1st foot of the constant-current driven chip is electrically connected voltage source negative pole, and the 2nd foot is electrically connected one end of the 4th resistance, with
The triggering starting point voltage value of output open circuit voltage is set, and the 3rd foot is electrically connected the control terminal of the control circuit module, in mistake
Under warm protective condition by the control circuit module according to adjustment parameter predetermined adjust output electric current variable quantity come
The current curve slope of load circuit is controlled, the 4th foot electrical connection voltage source is positive, the 5th foot electrical connection load circuit, and the 6th
Foot is electrically connected one end of the second resistance, and to control the peak inrush current value for the electric current for flowing through external inductors, the 7th foot is electrically connected
One end of the 3rd resistor is connect, to control the starting point temperature value that overheat protector is triggered, the other end of the second resistance,
The other end of the other end of the 3rd resistor and the 4th resistance is electrically connected the voltage source anode.
5. thermal-shutdown circuit according to claim 1, which is characterized in that the control circuit module includes: that capacitor can
Adjustment module and/or resistance adjustable module and/or voltage adjustable module；Wherein,
One end of the capacitor adjustable module is electrically connected with the controlled terminal of the drive module, the capacitor adjustable module
The other end ground connection；
One end of the resistance adjustable module is electrically connected with the controlled terminal of the drive module, the resistance adjustable module
The other end ground connection；
One end of the voltage adjustable module is electrically connected with the controlled terminal of the drive module, the voltage adjustable module
The other end ground connection.
6. thermal-shutdown circuit according to claim 5, which is characterized in that the resistance adjustable module includes: adjustable
Economize on electricity resistance；
One end of the adjustable resistor is electrically connected with the controlled terminal of the drive module, the other end of the adjustable resistor
Ground connection.
7. thermal-shutdown circuit according to claim 6, which is characterized in that the resistance adjustable module includes: second
Capacitor；
Second capacitor is in parallel with the adjustable resistor.
8. a kind of LED lamp, which is characterized in that including thermal-shutdown circuit described in any one of the claims 1~7,
First inductance, first diode and load circuit；
One end of the load circuit connect third tie point with the cathode of the first diode, the load circuit it is another
End connect the 5th tie point with one end of first inductance, the other end of first inductance, the thermal-shutdown circuit and
Anode the 4th tie point of connection of the first diode.
9. LED lamp according to claim 8, which is characterized in that the load circuit includes at least one LED light and
Five resistance, at least one described LED light are composed in series LED light group, one end of the LED light group, the 5th resistance one end
Connect the third tie point, other end connection the 5th connection of the other end of the LED light group, the 5th resistance
Point.
10. LED lamp according to claim 9, which is characterized in that the load circuit includes:
One end of third capacitor, the third capacitor is electrically connected the third tie point, and the other end of the third capacitor is electrically connected
Connect the 5th tie point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910663315.7A CN110381637A (en) | 2019-07-22 | 2019-07-22 | A kind of thermal-shutdown circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910663315.7A CN110381637A (en) | 2019-07-22 | 2019-07-22 | A kind of thermal-shutdown circuit and LED lamp |
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| CN110381637A true CN110381637A (en) | 2019-10-25 |
Family
ID=68254849
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|---|---|---|---|
| CN201910663315.7A Pending CN110381637A (en) | 2019-07-22 | 2019-07-22 | A kind of thermal-shutdown circuit and LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112235895A (en) * | 2020-09-10 | 2021-01-15 | 深圳市崧盛电子股份有限公司 | Over-temperature protection circuit and driving power supply |
| CN112351547A (en) * | 2020-12-04 | 2021-02-09 | 华源智信半导体(武汉)有限公司 | Intelligent adjusting method and system for driving LED |
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