CN110320952A - A kind of thermal-shutdown circuit and system - Google Patents
A kind of thermal-shutdown circuit and system Download PDFInfo
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- CN110320952A CN110320952A CN201910663317.6A CN201910663317A CN110320952A CN 110320952 A CN110320952 A CN 110320952A CN 201910663317 A CN201910663317 A CN 201910663317A CN 110320952 A CN110320952 A CN 110320952A
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 24
- 239000000725 suspension Substances 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 abstract description 4
- 230000006978 adaptation Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 18
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000002452 interceptive effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001595 flow curve Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The invention discloses a kind of thermal-shutdown circuit and system, which includes: that voltage generating module is configured to setting at least one level overheat protector trigger point voltage, exports trigger point voltage by the first output end；Computing module is configured at least one level trigger point voltage and feedback voltage based on the received and obtains reference voltage; first input end is electrically connected with the first output end and inputs at least one level trigger point voltage by first input end; wherein, feedback voltage is obtained based on the temperature of the thermal-shutdown circuit detected；Logical signal generation module is configured to reference voltage based on the received and generates logical signal to control the work of other devices; so that thermal-shutdown circuit provided in an embodiment of the present invention; current curve can be with dynamic regulation at least one overheat protector trigger point and during triggering overheat protector; so as to flexible adaptation in different application environments, meet the application demand that there is the product of overheat protector demand under different application environment.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of thermal-shutdown circuit and systems.
Background technique
Overheat protector is defencive function important in circuit application, has the product of overheat protector demand that can all design accordingly
Thermal-shutdown circuit.
Existing thermal-shutdown circuit has overheat protector trigger point comprising temperature detecting module.When sampling circuit
When operating temperature reaches the overheat protector trigger point, overheat protector mechanism is just will start or triggered, to issue overheat protector letter
Number or instruction, carry out limitation guarantor in a manner of current limliting or closing system etc. can choose product according to overheat protector signal or instruction
Shield.
But the overheat protector trigger point in existing thermal-shutdown circuit be often it is fixed and single inside circuit,
In the case where having fixed and single overheat protector trigger point, when the application environment difference of product, difference cannot be answered
Identification is distinguished with the operating mode of product under environment or protected mode, is unable to satisfy product answering under different application environment
Use demand.
Summary of the invention
The embodiment of the present invention provides a kind of thermal-shutdown circuit and system, can not for solving existing thermal-shutdown circuit
The problem of meeting application demand of the product under different application environment.
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:
Voltage generating module is configured to setting at least one level overheat protector trigger point voltage, have at least one the
One output end, and the trigger point voltage is exported by first output end；
Computing module is configured at least one level trigger point voltage and feedback voltage based on the received and obtains with reference to electricity
Pressure, with first input end, the second input terminal and second output terminal, the first input end and the voltage generating module
The electrical connection of first output end, and at least one level trigger point voltage is inputted by the first input end, pass through described second
Input terminal inputs the feedback voltage, exports the reference voltage by the second output terminal, wherein the feedback voltage base
It is obtained in the temperature of the thermal-shutdown circuit detected；
Logical signal generation module is configured to the reference voltage based on the received and generates logical signal to control other
Device work, with third input terminal and third output end, the third input terminal is electrically connected with the second output terminal, and
The reference voltage is inputted by the third input terminal, the logical signal is exported by the third output end.
Further, the voltage generating module includes at least one set of voltage generating unit, and voltage described in every group generates single
Member includes: the first current source and resistance, and one end of the resistance is electrically connected the first tie point with first current source, and described
One tie point is first output end, and the other end of the resistance is grounded；
Wherein, voltage generating unit described in every group is configured to setting level-one overheat protector trigger point voltage.
Further, if the quantity of the voltage generating unit is at least two groups, at least two groups voltage generates single
The resistance value of the resistance selected in member is different.
Further, the resistance is adjustable resistance, the adjustable resistance selected in at least two groups voltage generating unit
Resistance value adjustable range it is different.
Further, the thermal-shutdown circuit includes:
Voltage feedback module is configured to detect the temperature of the thermal-shutdown circuit, and obtains institute according to the temperature
Feedback voltage is stated, there is the 4th output end for exporting the feedback voltage, the 4th output end and second input terminal
Electrical connection.
Further, the computing module includes:
At least one operational amplifier is configured to obtain operation electricity according to the trigger point voltage and the feedback voltage
Pressure exports institute with the first input end, second input terminal and the 5th output end, and by the 5th output end
State machine voltage；
Adder is configured at least one described machine voltage based on the received and obtains the reference voltage, has extremely
Few 4th input terminal and the second output terminal, the 4th input terminal is electrically connected with the 5th output end, and is passed through
4th input terminal inputs the machine voltage.
Further, at least one described operational amplifier and the adder are integrated in the first chip.
Further, the quantity of the operational amplifier is consistent with the quantity of first output end；Described 4th
The quantity of input terminal is consistent with the quantity of the operational amplifier.
Further, the thermal-shutdown circuit includes:
At least one current rate adjustment module is configured to adjust the coefficient of the machine voltage, with control terminal,
The control terminal is electrically connected with the controlled terminal of the operational amplifier, and controls the operational amplifier by the control terminal
The coefficient of the machine voltage of generation.
Further, the logical signal generation module includes: the second current source, first capacitor, MOS transistor and compares
Device；
The outflow end of second current source, one end of the first capacitor, the drain electrode of the MOS transistor and the ratio
Positive input terminal compared with device is electrically connected the second tie point, the other end ground connection of the first capacitor, and the grid of the MOS transistor hangs
It sets to connect external drive signal, the source electrode ground connection of the MOS transistor, the negative input end of the comparator is third input
End, the output end of the comparator are the third output end.
Further, second current source, the first capacitor, the MOS transistor and the comparator are integrated in
Second chip.
Second aspect, the present invention provides a kind of overheat protector systems comprising thermal-shutdown circuit described above.
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 voltage generating module, computing module and logical signal
At least one level overheat protector trigger point voltage, computing module based on the received at least one is arranged in generation module, voltage generating module
Grade trigger point voltage and feedback voltage are obtained based on the feedback voltage that the temperature of the thermal-shutdown circuit detected obtains with reference to electricity
Pressure, reference voltage generates logical signal to control the work of other devices, so that this hair to logical signal generation module based on the received
The thermal-shutdown circuit that bright embodiment provides has at least one overheat protector trigger point and electricity during triggering overheat protector
Flow curve can be with dynamic regulation, and so as to flexibly carry out being adapted to different application environments, meeting has overheat protector demand
Application demand of the product under different application environment.
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 is the structural schematic diagram of voltage generating module in a kind of thermal-shutdown circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of practical application scene schematic diagram of thermal-shutdown circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of output current curve slope variation figure of 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 includes: voltage generating module 10, computing module
20 and logical signal generation module 30, individually below to voltage generating module 10, computing module 20 and logical signal generation module
Connection and work relationship between 30 are illustrated, specific as follows:
The voltage generating module 10 is configured to setting at least one level overheat protector trigger point voltage, the voltage generating module 10
Trigger point voltage is exported at least one the first output end 11, and by the first output end 11, wherein at least one is first defeated
The trigger point voltage value that outlet 11 exports is different.The voltage generating module 10 can be for configuration at least one level overheat protector touching
At least one level temperature protection trigger point voltage can be set in the chip of hair point voltage function, the chip；Alternatively, the voltage generating module
10 may include at least one set of voltage generating unit 10a, organizes voltage generating unit by least one set and adjusts generation at least one level
Overheat protector trigger point voltage.
When it is implemented, as shown in Fig. 2, the voltage generating module 10 may include at least one set of voltage generating unit 10a,
Every group of voltage generating unit 10a may include: the first current source D1 and resistance R101, one end of resistance R101 and the first current source
D1 is electrically connected the first tie point 1, and the first tie point 1 is the first output end 11, and the other end of resistance R101 is grounded, wherein every group
Voltage generating unit is configured to setting level-one overheat protector trigger point voltage, i.e., at least one set of voltage generating unit 10a is exportable
At least one temperature protection trigger point voltage；In the preferred embodiment of the present invention, if the quantity of voltage generating unit is at least two
The resistance value of group, the then resistance selected at least two groups voltage generating unit is different.Such as, voltage generating module 10 may include two groups
The resistance value of the resistance R101 selected in voltage generating unit 10a, every group of voltage generating unit 10a is different, then passes through the first output
The temperature protection trigger point voltage of 11 output of end is different.First current source D1 can be constant-current source, or adjustable current source.
In order to which the temperature protection trigger point voltage for exporting every group of voltage generating unit 10a by the first output end 11 is adjustable
Section, it is preferred that resistance R101 described in above-described embodiment is adjustable resistance R101, at least two groups voltage generating unit 10a
The resistance value adjustable range of the adjustable resistance R101 of selection is different, then every group of voltage generating unit 10a is defeated by the first output end 11
Temperature protection trigger point voltage out is different, and at least one exportable temperature protection trigger point electricity of each group of voltage generating unit 10a
Pressure.Wherein, the adjusting of adjustable resistance resistance value can be by interactive interface corresponding with thermal-shutdown circuit or adjustment interface
The gear button or adjusting knob of display are adjusted, to adjust the resistance value of adjustable resistance.
The computing module 20 is configured at least one level trigger point voltage and feedback voltage based on the received and obtains reference voltage,
It is electrically connected with first input end 21, the second input terminal 22 and second output terminal 23, first input end 21 with the first output end 11
It connects, and at least one level trigger point voltage, 22 input feedback voltage of the second input terminal, the second output is inputted by first input end 21
Hold 23 output reference voltages, wherein feedback voltage is obtained based on the temperature of the thermal-shutdown circuit detected, the feedback voltage
Voltage value be inversely proportional with temperature.
When it is implemented, the computing module 20 may include at least one operational amplifier 26 and adder 27, operation is put
Big device 26 is configured to obtain machine voltage according to trigger point voltage and feedback voltage, inputs with first input end 21, second
End 22 and the 5th output end 25, and machine voltage is exported by the 5th output end 25, adder 27 is configured to based on the received extremely
A few machine voltage obtains reference voltage, has at least one the 4th input terminal 24 and second output terminal 23, the 4th input
End 24 is electrically connected with the 5th output end 25, and inputs machine voltage by the 4th input terminal 24, passes through 26 basis of operational amplifier
Trigger point voltage and feedback voltage obtain machine voltage, then at least one machine voltage is referred to adder 27 based on the received
Voltage.Certainly, which can also be using other devices or circuit according at least one level trigger point voltage and feedback electricity
Pressure obtains reference voltage, as at least one operational amplifier 26 and adder 27 are integrated in first chip, etc..
Preferably, the quantity of operational amplifier 26 is consistent with the quantity of the first output end 11.The quantity of 4th input terminal 24
It is consistent with the quantity of operational amplifier 26.
The logical signal generation module 30 is configured to reference voltage based on the received and generates logical signal to control other devices
Part work, with third input terminal 31 and third output end 32, third input terminal 31 is electrically connected with second output terminal 23, and is led to
31 input reference voltage of third input terminal is crossed, 32 output logic signal of third output end is passed through.
When it is implemented, the logical signal generation module 30 may include: the second current source D2, first capacitor C101, MOS
Transistor Q101 and comparator U101.Wherein, the outflow end of the second current source D2, one end of first capacitor C101, MOS transistor
The drain electrode of Q101 and the positive input terminal of comparator U101 are electrically connected the second tie point 2, and the other end of first capacitor C101 is grounded,
The grid suspension of MOS transistor Q101 is to connect external drive signal, and the source electrode of MOS transistor Q101 is grounded, comparator U101's
Negative input end is third input terminal 31, and the output end of comparator U101 is third output end 32.Certainly, which generates mould
Block 30 can also use other devices or circuit to generate logical signal according to reference voltage to control the work of other devices, such as second
Current source D2, first capacitor C101, MOS transistor Q101 and comparator U101 are integrated in second chip, etc..
Further, as shown in Figure 1, thermal-shutdown circuit described in above-described embodiment may include at least one electric current
Rate adaptation module 40 is configured to adjust the coefficient of machine voltage, with control terminal 41, control terminal 41 and operational amplifier
26 controlled terminal 28 is electrically connected, and the coefficient for the machine voltage that operational amplifier 26 generates is controlled by control terminal 41.The electricity
Flow velocity rate adjustment module can be adjustable resistor, adjustable panel, adjustable interface, APP application program, optional gear or its
His virtual key, etc..The embodiment of the present invention provides setting current rate adjustment module, can pass through current rate adjustment module
The coefficient of machine voltage is adjusted, to adjust output electric current in the fall off rate of different excess temperature segments, so as to adjust output electric current
The slope of curve.
Illustratively, it is assumed that application scenarios are as follows: thermal-shutdown circuit provided in an embodiment of the present invention is applied to BUCK perseverance
In current circuit topological structure, the BUCK constant-current circuit be other devices, the BUCK constant-current circuit include external master power switch pipe,
The grid of driving signal processing module, inductor and LED load circuit, the outside master power switch pipe is electrically connected at driving signal
Module is managed, the logical signal that comparator U101 is generated is input to driving signal by output end (i.e. third output end 32) and handles mould
The source electrode of block, the outside master power switch pipe is electrically connected current sampling resistor, the drain electrode of the outside master power switch pipe and inductance
One end of device is electrically connected, the circuit of the other end electrical connection LED load circuit of inductor.The LED load circuit can be LED light
Product-derived, such as bulb lamp, floodlight tube, panel light, Projecting Lamp, fresh lamp, street lamp etc..
As shown in figure 3, at the end of the inductance freewheeling cycle, i.e., when inductive discharge is to zero, the grid of MOS transistor Q101 is connect
External drive signal low level is transformed by high level, the second current source D2 fills first capacitor C101 with constant current
Electricity, master power switch pipe is maintained in off-state outside this stage；Compare when the charging voltage of first capacitor C101 reaches
When the reference voltage of device U101, comparator U101 output logic signal switchs to high level by low level, at this point, external main power is opened
Pipe conducting is closed, inductance enters charge cycle, and first capacitor C101 is continuously in charged state, the logic letter of comparator U101 output
Number permanent High level is constant；When induction charging terminates to enter freewheeling cycle, external drive signal is transformed into high electricity by low level
Flat, MOS transistor Q101 is connected immediately, and first capacitor C101 repid discharge is to resetting, at this point, comparator U101 output logic letter
Number low level is changed by high level, external master power switch pipe is in an off state during this period, repeats with this.
And the parameter of thermal-shutdown circuit provided in an embodiment of the present invention is as follows:
Feedback voltage is VBE, and the quantity of trigger point voltage is two, respectively VT1 and VT2, and VT2 < VT1, such as Fig. 1 institute
Show.Voltage generating module 10 includes two groups of voltage generating unit 10a, two groups of voltage generating unit 10a generate respectively voltage VT1 and
VT2, wherein VT1 and VT2 can be adjusted flexibly and be arranged by resistance R101 and resistance R101 respectively, adjustment and setting
Implementation can be by the gear button or tune shown on interactive interface corresponding with thermal-shutdown circuit or adjustment interface
Knob is saved to adjust to realize.If the value of VT1 and VT2 is smaller, the threshold points for characterizing system overheat protector (OTP) triggering are higher,
As shown in Figure 2.In addition,
The arithmetic expression of first operational amplifier 26 are as follows: V1=K1 × (VT1-VBE), the arithmetic expression of second operational amplifier 26
Are as follows: V2=K2 × (VT2-VBE), the arithmetic expression of adder 27 are as follows: V3=V1+V2.Wherein, by adjusting K1 and K2 coefficient
It is worth fall off rate of the output electric current Iout in different segments of adjustable product, and the adjustment mode of K1 and K2 coefficient can
Be by adjusting current rate adjustment module (such as adjustable resistor, adjustable panel, adjustable interface, APP application program,
Optional gear or other virtual keys) Lai Shixian.
Specifically,
As VT2 < VBE < VT1, V3=K1 × (VT1-VBE), at this point, the temperature of product is more than temperature corresponding to VT1,
It is added and extends the delay time, i.e., terminate to next switch periods the time being again turned between the moment from switching tube afterflow.Also
It is to say, the temperature of product is higher, and feedback voltage V BE is smaller, and the delay time is longer；
As VBE < VT2, V3=K1 × (VT1-VBE)+K2 × (VT2-VBE)；At this point, the temperature of product is more than VT2 institute
When corresponding temperature, V3 becomes faster with feedback voltage V BE, and in identical temperature rise, the increased increment of V3 increases, table
The bright delay time is longer, and faster, the current curve slope for exporting electric current Iout is steeper, as shown in Figure 4 for current limliting rate.
Thermal-shutdown circuit provided in an embodiment of the present invention comprising voltage generating module, computing module and logical signal
At least one level overheat protector trigger point voltage, computing module based on the received at least one is arranged in generation module, voltage generating module
Grade trigger point voltage and feedback voltage are obtained based on the feedback voltage that the temperature of the thermal-shutdown circuit detected obtains with reference to electricity
Pressure, reference voltage generates logical signal to control the work of other devices, so that this hair to logical signal generation module based on the received
The thermal-shutdown circuit that bright embodiment provides has at least one overheat protector trigger point and electricity during triggering overheat protector
Flow curve can be with dynamic regulation, and so as to flexibly carry out being adapted to different application environments, meeting has overheat protector demand
Application demand of the product under different application environment.
In one embodiment, thermal-shutdown circuit provided in an embodiment of the present invention may include: voltage feedback module.Its
In, which detects the temperature of thermal-shutdown circuit, and obtains feedback voltage according to temperature, the voltage feedback module
The 4th output end with output feedback voltage, the 4th output end are electrically connected with the second input terminal.When it is implemented, the voltage is anti-
Feedback module can use the conversion circuit comprising temperature sensor.
Overheat protector system provided in an embodiment of the present invention may include: thermal-shutdown circuit, the thermal-shutdown circuit packet
It includes: voltage generating module 10, computing module 20 and logical signal generation module 30, individually below to voltage generating module 10, fortune
The connection and work relationship calculated between module 20 and logical signal generation module 30 are illustrated, specific as follows:
The voltage generating module 10 is configured to setting at least one level overheat protector trigger point voltage, the voltage generating module 10
Trigger point voltage is exported at least one the first output end 11, and by the first output end 11, wherein at least one is first defeated
The trigger point voltage value that outlet 11 exports is different.The voltage generating module 10 can be for configuration at least one level overheat protector touching
At least one level temperature protection trigger point voltage can be set in the chip of hair point voltage function, the chip；Alternatively, the voltage generating module
10 may include at least one set of voltage generating unit 10a, organizes voltage generating unit by least one set and adjusts generation at least one level
Overheat protector trigger point voltage.
When it is implemented, as shown in Fig. 2, the voltage generating module 10 may include at least one set of voltage generating unit 10a,
Every group of voltage generating unit 10a may include: the first current source D1 and resistance R101, one end of resistance R101 and the first current source
D1 is electrically connected the first tie point 1, and the first tie point 1 is the first output end 11, and the other end of resistance R101 is grounded, wherein every group
Voltage generating unit is configured to setting level-one overheat protector trigger point voltage, i.e., at least one set of voltage generating unit 10a is exportable
At least one temperature protection trigger point voltage；In the preferred embodiment of the present invention, if the quantity of voltage generating unit is at least two
The resistance value of group, the then resistance selected at least two groups voltage generating unit is different.Such as, voltage generating module 10 may include two groups
The resistance value of the resistance R101 selected in voltage generating unit 10a, every group of voltage generating unit 10a is different, then passes through the first output
The temperature protection trigger point voltage of 11 output of end is different, and first current source D1 can be constant-current source, or adjustable current source.
In order to which the temperature protection trigger point voltage for exporting every group of voltage generating unit 10a by the first output end 11 is adjustable
Section, it is preferred that resistance R101 described in above-described embodiment is adjustable resistance R101, at least two groups voltage generating unit 10a
The resistance value adjustable range of the adjustable resistance R101 of selection is different, then every group of voltage generating unit 10a is defeated by the first output end 11
Temperature protection trigger point voltage out is different, and at least one exportable temperature protection trigger point electricity of each group of voltage generating unit 10a
Pressure.Wherein, the adjusting of adjustable resistance resistance value can be by interactive interface corresponding with thermal-shutdown circuit or adjustment interface
The gear button or adjusting knob of display are adjusted, to adjust the resistance value of adjustable resistance.
The computing module 20 is configured at least one level trigger point voltage and feedback voltage based on the received and obtains reference voltage,
It is electrically connected with first input end 21, the second input terminal 22 and second output terminal 23, first input end 21 with the first output end 11
It connects, and at least one level trigger point voltage, 22 input feedback voltage of the second input terminal, the second output is inputted by first input end 21
Hold 23 output reference voltages, wherein feedback voltage is obtained based on the temperature of the thermal-shutdown circuit detected, the feedback voltage
Voltage value be inversely proportional with temperature.
When it is implemented, the computing module 20 may include at least one operational amplifier 26 and adder 27, operation is put
Big device 26 is configured to obtain machine voltage according to trigger point voltage and feedback voltage, inputs with first input end 21, second
End 22 and the 5th output end 25, and machine voltage is exported by the 5th output end 25, adder 27 is configured to based on the received extremely
A few machine voltage obtains reference voltage, has at least one the 4th input terminal 24 and second output terminal 23, the 4th input
End 24 is electrically connected with the 5th output end 25, and inputs machine voltage by the 4th input terminal 24, passes through 26 basis of operational amplifier
Trigger point voltage and feedback voltage obtain machine voltage, then at least one machine voltage is referred to adder 27 based on the received
Voltage.Certainly, which can also be using other devices or circuit according at least one level trigger point voltage and feedback electricity
Pressure obtains reference voltage, as at least one operational amplifier 26 and adder 27 are integrated in first chip, etc..
Preferably, the quantity of operational amplifier 26 is consistent with the quantity of the first output end 11.The quantity of 4th input terminal 24
It is consistent with the quantity of operational amplifier 26.
The logical signal generation module 30 is configured to reference voltage based on the received and generates logical signal to control other devices
Part work, with third input terminal 31 and third output end 32, third input terminal 31 is electrically connected with second output terminal 23, and is led to
31 input reference voltage of third input terminal is crossed, 32 output logic signal of third output end is passed through.
When it is implemented, the logical signal generation module 30 may include: the second current source D2, first capacitor C101, MOS
Transistor Q101 and comparator U101.Wherein, the outflow end of the second current source D2, one end of first capacitor C101, MOS transistor
The drain electrode of Q101 and the positive input terminal of comparator U101 are electrically connected the second tie point 2, and the other end of first capacitor C101 is grounded,
The grid suspension of MOS transistor Q101 is to connect external drive signal, and the source electrode of MOS transistor Q101 is grounded, comparator U101's
Negative input end is third input terminal 31, and the output end of comparator U101 is third output end 32.Certainly, which generates mould
Block 30 can also use other devices or circuit to generate logical signal according to reference voltage to control the work of other devices, such as second
Current source D2, first capacitor C101, MOS transistor Q101 and comparator U101 are integrated in second chip, etc..
Further, as shown in Figure 1, thermal-shutdown circuit described in above-described embodiment may include at least one electric current
Rate adaptation module 40 is configured to adjust the coefficient of machine voltage, with control terminal 41, control terminal 41 and operational amplifier
26 controlled terminal 28 is electrically connected, and the coefficient for the machine voltage that operational amplifier 26 generates is controlled by control terminal 41.The electricity
Flow velocity rate adjustment module can be adjustable resistor, adjustable panel, adjustable interface, APP application program, optional gear or its
His virtual key, etc..The embodiment of the present invention provides setting current rate adjustment module, can pass through current rate adjustment module
The coefficient of machine voltage is adjusted, to adjust output electric current in the fall off rate of different segments, so as to adjust output current curve
Slope.
Illustratively, it is assumed that application scenarios are as follows: thermal-shutdown circuit provided in an embodiment of the present invention is applied to BUCK perseverance
In current circuit topological structure, the BUCK constant-current circuit be other devices, the BUCK constant-current circuit include external master power switch pipe,
The grid of driving signal processing module, inductor and LED load circuit, the outside master power switch pipe is electrically connected at driving signal
Module is managed, the logical signal that comparator U101 is generated is input to driving signal by output end (i.e. third output end 32) and handles mould
The source electrode of block, the outside master power switch pipe is electrically connected current sampling resistor, the drain electrode of the outside master power switch pipe and inductance
One end of device is electrically connected, the circuit of the other end electrical connection LED load circuit of inductor.The LED load circuit can be LED light
Product-derived, such as bulb lamp, floodlight tube, panel light, Projecting Lamp, fresh lamp, street lamp etc..
As shown in figure 3, at the end of the inductance freewheeling cycle, i.e., when inductive discharge is to zero, the grid of MOS transistor Q101 is connect
External drive signal low level is transformed by high level, the second current source D2 fills first capacitor C101 with constant current
Electricity, master power switch pipe is maintained in off-state outside this stage；Compare when the charging voltage of first capacitor C101 reaches
When the reference voltage of device U101, comparator U101 output logic signal switchs to high level by low level, at this point, external main power is opened
Pipe conducting is closed, inductance enters charge cycle, and first capacitor C101 is continuously in charged state, the logic letter of comparator U101 output
Number permanent High level is constant；When induction charging terminates to enter freewheeling cycle, external drive signal is transformed into high electricity by low level
Flat, MOS transistor Q101 is connected immediately, and first capacitor C101 repid discharge is to resetting, at this point, comparator U101 output logic letter
Number low level is changed by high level, external master power switch pipe is in an off state during this period, repeats with this.
And the parameter of thermal-shutdown circuit provided in an embodiment of the present invention is as follows:
Feedback voltage is VBE, and the quantity of trigger point voltage is two, respectively VT1 and VT2, and VT2 < VT1, such as Fig. 1 institute
Show.Voltage generating module 10 includes two groups of voltage generating unit 10a, two groups of voltage generating unit 10a generate respectively voltage VT1 and
VT2, wherein VT1 and VT2 can be adjusted flexibly and be arranged by resistance R101 and resistance R102 respectively, adjustment and setting
Implementation can be by the gear button or tune shown on interactive interface corresponding with thermal-shutdown circuit or adjustment interface
Knob is saved to adjust to realize.If the value of VT1 and VT2 is smaller, the threshold points for characterizing system overheat protector (OTP) triggering are higher,
As shown in Figure 2.In addition,
The arithmetic expression of first operational amplifier 26 are as follows: V1=K1 × (VT1-VBE), the arithmetic expression of second operational amplifier 26
Are as follows: V2=K2 × (VT2-VBE), the arithmetic expression of adder 27 are as follows: V3=V1+V2.Wherein, by adjusting K1 and K2 coefficient
It is worth fall off rate of the output electric current Iout in different segments of adjustable product, and the adjustment mode of K1 and K2 coefficient can
Be by adjusting current rate adjustment module (such as adjustable resistor, adjustable panel, adjustable interface, APP application program,
Optional gear or other virtual keys) Lai Shixian.
Specifically,
As VT2 < VBE < VT1, V3=K1 × (VT1-VBE), at this point, the temperature of product is more than temperature corresponding to VT1,
It is added and extends the delay time, i.e., terminate to next switch periods the time being again turned between the moment from switching tube afterflow.Also
It is to say, the temperature of product is higher, and feedback voltage V BE is smaller, and the delay time is longer；
As VBE < VT2, V3=K1 × (VT1-VBE)+K2 × (VT2-VBE)；At this point, the temperature of product is more than VT2 institute
When corresponding temperature, V3 becomes faster with feedback voltage V BE, and in identical temperature rise, the increased increment of V3 increases, table
The bright delay time is longer, and faster, the current curve slope of the output electric current Iout of product is steeper, as shown in Figure 4 for current limliting rate.
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.
Thermal-shutdown circuit provided in an embodiment of the present invention comprising voltage generating module, computing module and logical signal
At least one level overheat protector trigger point voltage, computing module based on the received at least one is arranged in generation module, voltage generating module
Grade trigger point voltage and feedback voltage are obtained based on the feedback voltage that the temperature of the thermal-shutdown circuit detected obtains with reference to electricity
Pressure, reference voltage generates logical signal to control the work of other devices, so that this hair to logical signal generation module based on the received
The thermal-shutdown circuit that bright embodiment provides has at least one overheat protector trigger point and electricity during triggering overheat protector
Flow curve can be with dynamic regulation, and so as to flexibly carry out being adapted to different application environments, meeting has overheat protector demand
Application demand of the product under different application environment.
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
Voltage generating module is configured to setting at least one level overheat protector trigger point voltage, has at least one first defeated
Outlet, and the trigger point voltage is exported by first output end；
Computing module is configured at least one level trigger point voltage and feedback voltage based on the received and obtains reference voltage,
It is with first input end, the second input terminal and second output terminal, and the of the first input end and the voltage generating module
The electrical connection of one output end, and at least one level trigger point voltage is inputted by the first input end, it is defeated by described second
Enter end and input the feedback voltage, the reference voltage is exported by the second output terminal, wherein the feedback voltage is based on
What the temperature of the thermal-shutdown circuit detected obtained；
Logical signal generation module is configured to the reference voltage based on the received and generates logical signal to control other devices
Work, with third input terminal and third output end, the third input terminal is electrically connected with the second output terminal, and is passed through
The third input terminal inputs the reference voltage, exports the logical signal by the third output end.
2. thermal-shutdown circuit according to claim 1, which is characterized in that the voltage generating module includes at least one set
Voltage generating unit, voltage generating unit described in every group include: the first current source and resistance, one end of the resistance and described the
One current source is electrically connected the first tie point, and first tie point is first output end, and the other end of the resistance is grounded；
Wherein, voltage generating unit described in every group is configured to setting level-one overheat protector trigger point voltage.
3. thermal-shutdown circuit according to claim 2, which is characterized in that
If the quantity of the voltage generating unit is at least two groups, the resistance selected in at least two groups voltage generating unit
Resistance value it is different.
4. thermal-shutdown circuit according to claim 3, which is characterized in that the resistance be adjustable resistance, it is described at least
The resistance value adjustable range of the adjustable resistance selected in two groups of voltage generating units is different.
5. thermal-shutdown circuit according to claim 1, which is characterized in that the thermal-shutdown circuit includes:
Voltage feedback module is configured to detect the temperature of the thermal-shutdown circuit, and is obtained according to the temperature described anti-
Feedthrough voltage, has the 4th output end for exporting the feedback voltage, and the 4th output end is electrically connected with second input terminal
It connects.
6. thermal-shutdown circuit according to any one of claims 1 to 5, which is characterized in that the computing module includes:
At least one operational amplifier is configured to obtain machine voltage according to the trigger point voltage and the feedback voltage,
The fortune is exported with the first input end, second input terminal and the 5th output end, and by the 5th output end
Calculate voltage；
Adder is configured at least one described machine voltage based on the received and obtains the reference voltage, has at least one
A 4th input terminal and the second output terminal, the 4th input terminal are electrically connected with the 5th output end, and by described
4th input terminal inputs the machine voltage.
7. thermal-shutdown circuit according to claim 6, which is characterized in that the thermal-shutdown circuit includes:
At least one current rate adjustment module is configured to adjust the coefficient of the machine voltage, described with control terminal
Control terminal is electrically connected with the controlled terminal of the operational amplifier, and is controlled the operational amplifier by the control terminal and generated
Machine voltage coefficient.
8. thermal-shutdown circuit according to claim 1, which is characterized in that the logical signal generation module includes:
Two current sources, first capacitor, MOS transistor and comparator；
The outflow end of second current source, one end of the first capacitor, the drain electrode of the MOS transistor and the comparator
Positive input terminal be electrically connected the second tie point, the first capacitor the other end ground connection, the MOS transistor grid suspension with
External drive signal is connect, the source electrode ground connection of the MOS transistor, the negative input end of the comparator is the third input terminal,
The output end of the comparator is the third output end.
9. the thermal-shutdown circuit according to claim 6 or 8, which is characterized in that at least one described operational amplifier and
The adder is integrated in the first chip；Second current source, the first capacitor, the MOS transistor and the comparison
Device is integrated in the second chip.
10. a kind of overheat protector system, which is characterized in that including overheat protector described in any one of the claims 1~9
Circuit.
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| CN201910663317.6A CN110320952B (en) | 2019-07-22 | 2019-07-22 | Over-temperature protection circuit and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117375178A (en) * | 2023-11-08 | 2024-01-09 | 瀚昕微电子(无锡)有限公司 | Discharge device for PD chip and discharge method thereof |
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