CN208046448U - Over-temperature protection device and Switching Power Supply - Google Patents
Over-temperature protection device and Switching Power Supply Download PDFInfo
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Abstract
The disclosure provides an over-temperature protection device and a switching power supply, and relates to the technical field of electronic circuits. The overtemperature protection device of the present disclosure includes: a temperature controlled voltage output circuit configured to output a temperature controlled voltage according to a temperature change, wherein the temperature controlled voltage changes with a change in temperature when the temperature is greater than a predetermined protection value; a measurement comparison circuit configured to compare the temperature controlled voltage and the sampled voltage value on the controlled circuit; and the driving circuit is configured to limit the current magnitude on the controlled circuit so that the sampling voltage value is not greater than the temperature control voltage. The temperature control current limiting device can adjust the temperature control voltage according to the temperature change when the temperature is higher than the preset protection value, and then the on-off of the controlled circuit is determined according to the sampling voltage and the temperature control voltage on the controlled circuit, so that the current is controlled according to the temperature, and the available duration of the controlled equipment is prolonged.
Description
Technical field
This disclosure relates to electronic circuit technology field, especially a kind of over-temperature protection device and Switching Power Supply.
Background technology
In Switching Power Supply product, temperature is a very crucial performance indicator.Excessively high temperature will cause to temperature
Spend sensitive semiconductor devices (such as MOS (Metal-Oxid-Semiconductor, metal-oxide semiconductor (MOS)) pipes, three poles
Pipe), the failures of the components such as capacitance.When temperature is more than certain value, exponentially rule increases crash rate.There is statistics table
Bright, electronic component temperature often increases 2 DEG C, and reliability can decline 10%；And temperature increase 50 DEG C when service life there was only temperature liter
The 1/6 of service life at high 25 DEG C.Other than electric stress, temperature is influence Switching Power Supply component reliability and stability most heavy
The factor wanted adds the calorific value of Switching Power Supply itself, it is easy to make electronic component work especially when environment temperature is higher
Make in high-temperature condition, accelerating power source aging.Therefore thermal-shutdown circuit must be used in switching power circuit, make Switching Power Supply
The operating temperature of component controls within the range of permission, to ensure its reliability and stability.
Invention content
Inventor find, in the related art, in analog circuit using to thermal-shutdown circuit be all by acquire ring
Border temperature or the temperature of power module are to determine whether trigger protection, when environment temperature or temperature of power module are more than protection value
When, trigger protection action, locking pulse, power supply is stopped, and prevents power work under high temperature environment.Such overheat protector
Circuit only temperature be higher than protection value when by logical AND gate locking pulse, so that power supply is stopped, power supply only work and
Do not work two states, shortens the available duration of Switching Power Supply, limits the use scope of Switching Power Supply.
One purpose of the disclosure is to increase the available duration of controlled circuit.
According to one aspect of the disclosure, a kind of over-temperature protection device is proposed, including：Temperature control voltage follower circuit, by with
It is set to and temperature control voltage is exported according to temperature change, wherein temperature control voltage variation with temperature when temperature is more than predetermined protection value
And change；Comparison circuit is measured, is configured as comparing the sample voltage value on temperature control voltage and controlled circuit；Driving circuit, quilt
The size of current being configured on limitation controlled circuit is so that sample voltage value is not more than temperature control voltage.
Optionally, temperature control voltage when temperature is more than predetermined protection value variation with temperature and change including：Temperature control voltage
It is constant when temperature is less than or equal to predetermined protection value, it increases and reduces with temperature after temperature is more than predetermined protection value.
Optionally, temperature control voltage follower circuit includes：Excess temperature judges sub-circuit, is configured as according to temperature change output just
Beginning temperature control voltage, initial temperature control voltage is constant when temperature is less than or equal to predetermined protection value, after temperature is more than predetermined protection value
It increases and increases with temperature；Subtraction sub-circuit is configured as according to initial temperature control voltage output temperature control voltage, wherein temperature control electricity
Pressure is reduced with the raising of initial temperature control voltage.
Optionally, excess temperature judges that sub-circuit includes：First power supply circuit and the second power supply circuit；When temperature is less than or equal in advance
When determining protection value, constant initial temperature control voltage is exported by the first power supply circuit；When temperature is more than predetermined protection value, switching
It is increased and raised initial temperature control voltage with temperature to the output of the second power supply circuit.
Optionally, the first power supply circuit includes the first reference voltage source and the first diode, the input terminal of the first diode
The first reference voltage source is connected, output end judges that the output end of sub-circuit is connect with excess temperature；Second power supply circuit includes the second base
The thermistor and ground resistance of reference voltage source, negative temperature coefficient, the first end of thermistor are connect with the second reference voltage, the
Two ends pass through ground resistance earth；The input terminal of second diode and the second end of thermistor connect, and output end is sentenced with excess temperature
The output end connection of disconnected sub-circuit；When temperature be equal to predetermined protection value when, partial pressure of second reference voltage on ground resistance with
The voltage value of first reference voltage is equal.
Optionally, it includes comparator to measure comparison circuit；The positive input of comparator up-samples voltage with controlled circuit
Output end connection, reverse input end connect with the output end of temperature control voltage follower circuit, and output end is measurement comparison circuit
Output end.
Optionally, driving circuit includes latch and transistor；The signal input part of latch and measurement comparison circuit
Output end connects, and the grid of output end and transistor connects；Transistor is configured as controlling controlled circuit by the signal of grid
Break-make.
Optionally, when the signal input part input low level of latch, and when clock signal input terminal input high level, lock
The output signal of the signal output end of storage makes transistor controls controlled circuit be connected；When the signal input part of latch inputs height
Level, and when clock signal input terminal input low level, the output signal of the signal output end of latch makes transistor controls quilt
Control circuit breaker；When the signal input part input low level of latch, and when clock signal input terminal input low level, latch
Signal output end output voltage remain unchanged.
Optionally, transistor is NMOS (N-Metal-Oxide-Semiconductor, N-type metal-oxide-partly lead
Body) pipe；When the signal input part input low level of latch, and when clock signal input terminal input high level, the letter of latch
Number output end exports high level to the grid of NMOS tube；When the signal input part input high level of latch, and clock signal is defeated
When entering to hold input low level, the signal output end of latch exports low level to the grid of NMOS tube.
Optionally, transistor is PMOS (Positive Channel Metal Oxide Semiconductor, p-type gold
Category-Oxidc-Semiconductor) pipe；When the signal input part input low level of latch, and clock signal input terminal input high level
When, the signal output end of latch exports low level to the grid of PMOS tube；When the signal input part input high level of latch,
And when clock signal input terminal input low level, the signal output end of latch exports high level to the grid of PMOS tube.
Such over-temperature protection device can adjust temperature control electricity when temperature is higher than predetermined protection value according to the variation of temperature
It presses, and then determines the break-make of controlled circuit with temperature control voltage according to the sampled voltage on controlled circuit, to realize according to temperature
Height control size of current, increases the available duration of controlled circuit, extends the use scope of controlled circuit.
According to another aspect of the disclosure, a kind of Switching Power Supply is proposed, including：Switching Power Supply main circuit；With above
Any one over-temperature protection device mentioned is configured as carrying out overheat protector to Switching Power Supply main circuit.
Such Switching Power Supply can adjust temperature control voltage when temperature is higher than predetermined protection value according to the variation of temperature, into
And the break-make of Switching Power Supply main circuit is determined with temperature control voltage according to the sampled voltage on Switching Power Supply main circuit, to realize root
According to temperature height control size of current, increase the available duration of Switching Power Supply, the use scope of expansion switch power supply.
Description of the drawings
Attached drawing described herein is used for providing further understanding of the disclosure, constitutes a part of this disclosure, this public affairs
The illustrative embodiments and their description opened do not constitute the improper restriction to the disclosure for explaining the disclosure.In the accompanying drawings：
Fig. 1 is the schematic diagram of one embodiment of the over-temperature protection device of the disclosure.
Fig. 2 be the disclosure over-temperature protection device in temperature control voltage follower circuit one embodiment schematic diagram.
Fig. 3 be the disclosure over-temperature protection device in temperature control voltage follower circuit another embodiment circuit diagram.
Fig. 4 be the disclosure over-temperature protection device in measure comparison circuit and driving circuit one embodiment signal
Figure.
Fig. 5 is the circuit diagram of another embodiment of the over-temperature protection device of the disclosure.
Fig. 6 is the using renderings of one embodiment of the over-temperature protection device of the disclosure.
Fig. 7 is the schematic diagram of one embodiment of the Switching Power Supply of the disclosure.
Specific implementation mode
Below by drawings and examples, the technical solution of the disclosure is described in further detail.
The schematic diagram of one embodiment of the over-temperature protection device of the disclosure is as shown in Figure 1.
Temperature control voltage follower circuit 11 can export temperature control voltage to comparison circuit is measured.Temperature control voltage is with current controlled electricity
The temperature change on road and convert.In one embodiment, temperature control voltage is constant when temperature is less than or equal to predetermined protection value, in temperature
Degree is reduced more than being increased with temperature after predetermined protection value.In one embodiment, the circuit including thermistor can be passed through
Realize the adjusting to temperature control voltage.
The sample voltage value on temperature control voltage and controlled circuit can be compared by measuring comparison circuit, and sample voltage value can be
Controlled circuit up-samples the pressure drop at resistance both ends, can reflect the current conditions on controlled circuit.Sample voltage value is not limited to
It is obtained using resistance sampling, can also be sampled by current sensor or other sample modes obtain.
Driving circuit can limit the size of current on controlled circuit so that sample voltage value is not more than temperature control voltage, one
In a embodiment, due to the raising temperature control voltage reduction with temperature, then the maximum value of sampled voltage reduces, so that being controlled
Current maxima on circuit reduces.
Such over-temperature protection device can adjust temperature control electricity when temperature is higher than predetermined protection value according to the variation of temperature
It presses, and then determines the break-make of controlled circuit with temperature control voltage according to the sampled voltage on controlled circuit, to realize according to temperature
Height control size of current, increases the available duration of controlled circuit, extends the use scope of controlled device.
In one embodiment, controlled circuit can be various forms of switching power circuits, to increase Switching Power Supply
Available duration, the use scope of expansion switch power supply.
The schematic diagram of temperature control voltage follower circuit one embodiment is as shown in Figure 2 in the over-temperature protection device of the disclosure.Temperature
It may include that excess temperature judges sub-circuit 211 and subtraction sub-circuit 212 to control voltage follower circuit.
Excess temperature judges that sub-circuit 211 can export initial temperature control voltage according to temperature change, and initial temperature control voltage is in temperature
It is constant when less than or equal to predetermined protection value, it increases and increases with temperature after temperature is more than predetermined protection value.In one embodiment
In, as shown in Fig. 2, excess temperature judges that sub-circuit 211 includes the first power supply circuit 2111 and the second power supply circuit 2112.First power supply
Circuit 2111 can export constant voltage, and the second power supply circuit 2112 includes thermistor, can export and be increased with temperature
And raised voltage.When temperature is less than or equal to predetermined protection value, by 2111 output voltage of the first power supply circuit；When temperature is more than
When predetermined protection value, by 2112 output voltage of the second power supply circuit.
Subtraction sub-circuit 212 can be according to initial temperature control voltage output temperature control voltage, and temperature control voltage is with initial temperature control voltage
Raising and reduce.
Such over-temperature protection device can judge that sub-circuit and subtraction sub-circuit realize output temperature control voltage using excess temperature,
Structure is reliable and is easy to implement, and is conducive to promote and apply.
The circuit diagram of another embodiment of temperature control voltage follower circuit such as Fig. 3 institutes in the over-temperature protection device of the disclosure
Show.
First power supply circuit 3111 includes the first reference voltage source Vr1 and the first diode D1, and the first diode D1's is defeated
Enter the first reference voltage source Vr1 of end connection, output end judges that the output end of sub-circuit is connect with excess temperature.Initial temperature control voltage Ve
It indicates.
Second power supply circuit 3112 includes the second reference voltage source Vr2, the thermistor R1 of negative temperature coefficient and ground connection electricity
R2 is hindered, the first end of thermistor R1 is connect with the second reference voltage V r2, and second end is grounded by ground resistance R2；Two or two
The input terminal of pole pipe D2 is connect with the second end of thermistor R1, and output end judges that the output end of sub-circuit is connect with excess temperature.
When temperature is less than predetermined protection value, partial pressure Vr2*R2/ (R1+s of the second reference voltage V r2 on ground resistance
R2) it is less than Vr1, Ve=Vr1.
When temperature is equal to predetermined protection value, partial pressure Vr2*R2/ (R1+R2) of second reference voltage on ground resistance=
Vr1=Ve.
When temperature is more than predetermined protection value, partial pressure Vr2*R2/ (R1+s of the second reference voltage V r2 on ground resistance
R2) it is more than Vr1, the first power supply circuit 3111 blocks, Ve=Vr2*R2/ (R1+R2).
Such excess temperature judges that sub-circuit can be carried when temperature is less than predetermined protection value using the first power supply circuit 3111
For initial temperature control voltage, ensure the stabilization of initial temperature control voltage；When temperature is higher than predetermined protection value, using the second power supply circuit
3112 provide initial temperature control voltage, so that initial temperature control voltage is increased and is increased with temperature, circuit is reliable and small, is conducive to collect
At application.
In one embodiment, as shown in figure 3, subtraction sub-circuit 312 can be realized by amplifier.In order to facilitate operation,
R3=R4=R5=R6 can be set, and the temperature control voltage Ve ' of the output of amplifier U1 is proportional to Vr3-Ve, to make Ve ' with Ve's
It increases and reduces, i.e., reduced with the raising of temperature, circuit is reliable and small, is conducive to integrated application.Implement at one
In example, subtraction can realize the function that Ve ' is reduced with the raising of Ve from circuit 312 by any one subtraction circuit.
Schematic diagram such as Fig. 4 of one embodiment of comparison circuit and driving circuit is measured in the over-temperature protection device of the disclosure
It is shown.
It includes comparator 42 to measure comparison circuit, and driving circuit can be PWM (Pulse Width Modulation, arteries and veins
Rush width modified tone) driving circuit, including latch 431 and transistor 433.Two input terminals of comparator 42 respectively with controlled electricity
The output end of road sampled voltage is connected with the output end of temperature control voltage follower circuit, and the input terminal of output end and driving circuit connects
It connects.Comparator 42 outputs signal to the signal input part of latch 431.The grid of the signal output end and transistor 432 of latch
Pole connects.The source electrode and drain electrode of transistor 432 is series at controlled circuit, passes through the output signal control of the signal output end of latch
Break-make between transistor source electrode and drain electrode processed, to control the break-make of controlled circuit.
Such over-temperature protection device can utilize the break-make of the output signal control controlled circuit of latch, and latch
Output signal and the electric current of controlled circuit be temperature dependent, to realize according to temperature limited current, avoiding apparatus overheat
While can also make equipment normal use by way of reducing electric current, improve tolerance of the controlled circuit to temperature, expand
Open up the use scope of controlled device.
The circuit diagram of another embodiment of the over-temperature protection device of the disclosure is as shown in Figure 5.The forward direction of comparator U2 is defeated
Enter end to connect with the output end of controlled circuit up-sampling voltage, the output end of reverse input end and temperature control voltage follower circuit connects
It connects.The input terminal R of latch is connect with the output end of comparator U2, and the ends S are connect with clock signal, output end Q and transistor Q1
Grid connection.Vd identifies for controlled circuit voltage source, and the source electrode and drain electrode of transistor Q1 is located at controlled circuit.Rs is controlled electricity
The sampling resistor of road, Vs are the pressure drop at the both ends Rs, as sampled voltage.
In one embodiment, Q1 is NMOS tube, then the state change situation of latch can be as shown in table 1：
1 transistor of table is the output logic of latch in the case of NMOS tube
In another embodiment, if Q1 is PMOS tube, when it is 0 that S, which is 1, R, Q 0；When it is 1 that S, which is 0, R, Q is
1。
The design sketch of one embodiment of the using effect of over-temperature protection device is as shown in Figure 6.By taking Q1 is NMOS tube as an example,
If the source-drain electrode of transistor is made to be connected, grid input high level is needed, that is, needs R to input 0, i.e. Ve ' > Vs, so as to ensure
Electric current Is < Ve '/Rs in switching circuit.When temperature is less than predetermined protection value, then Ve ' is higher (such as Ve ' dotted lines institute in Fig. 6
Show)；When temperature is more than predetermined protection value, Ve ' is reduced as temperature increases, then the maximum value of Vs reduces, the maximum of Vs/Rs
Value also reduces, and controls source current size according to temperature to realize, and source current size declines with the raising of temperature,
Ensure operating temperature within the allowable range while, increase equipment can normal use time.
The schematic diagram of one embodiment of the Switching Power Supply of the disclosure is as shown in Figure 7.Switching Power Supply 70 includes Switching Power Supply
Main circuit 71 and over-temperature protection device 72.Switching Power Supply main circuit refers to executing control switching tube on-off function in Switching Power Supply
Circuit.Over-temperature protection device 72 can be above any one over-temperature protection device.Over-temperature protection device 72 can limit
The sampled voltage of Switching Power Supply main circuit is not more than the temperature control voltage of over-temperature protection device 72, and when temperature is less than predetermined protection value
When, temperature control voltage is constant, and when temperature is higher than predetermined protection value, temperature control voltage is increased with temperature and reduced so that Switching Power Supply
The maximum value of the electric current of main circuit 71 is increased with temperature and is reduced.
Such Switching Power Supply can adjust temperature control voltage when temperature is higher than predetermined protection value according to the variation of temperature, into
And the break-make of Switching Power Supply main circuit is determined with temperature control voltage according to the sampled voltage on Switching Power Supply main circuit, to realize root
According to temperature height control size of current, increase the available duration of Switching Power Supply, the use scope of expansion switch power supply.
Finally it should be noted that：Above example is only to illustrate the technical solution of the disclosure rather than its limitations；To the greatest extent
Pipe is described in detail the disclosure with reference to preferred embodiment, those of ordinary skills in the art should understand that：Still
It can modify to the specific implementation mode of the disclosure or equivalent replacement is carried out to some technical characteristics；Without departing from this public affairs
The spirit of technical solution is opened, should all be covered in the claimed technical proposal scope of the disclosure.
Claims (11)
1. a kind of over-temperature protection device, including：
Temperature control voltage follower circuit is configured as exporting temperature control voltage according to temperature change, wherein the temperature control voltage is in temperature
Variation with temperature when more than predetermined protection value and change；
Measure comparison circuit, the sample voltage value being configured as on temperature control voltage and controlled circuit described in comparison；
Driving circuit, the size of current being configured as on limitation controlled circuit is so that the sample voltage value is not more than the temperature control
Voltage.
2. the apparatus according to claim 1, wherein the temperature control voltage is when temperature is more than the predetermined protection value with temperature
The variation of degree and change including：
The temperature control voltage is constant when temperature is less than or equal to the predetermined protection value；
The temperature control voltage is increased with temperature after temperature is more than the predetermined protection value and is reduced.
3. the apparatus of claim 2, wherein the temperature control voltage follower circuit includes：
Excess temperature judges sub-circuit, is configured as exporting initial temperature control voltage according to temperature change, the initial temperature control voltage is in temperature
Degree is less than or equal to constant when predetermined protection value, the raising with temperature raising after temperature is more than the predetermined protection value；
Subtraction sub-circuit is configured as according to temperature control voltage described in the initial temperature control voltage output, wherein the temperature control voltage
It is reduced with the raising of the initial temperature control voltage.
4. device according to claim 3, wherein the excess temperature judges that sub-circuit includes：
First power supply circuit and the second power supply circuit；
When temperature is less than or equal to the predetermined protection value, constant initial temperature control voltage is exported by the first power supply circuit；
When temperature is more than the predetermined protection value, switches to the output of the second power supply circuit and increased and raised initial temperature with temperature
Control voltage.
5. device according to claim 4, wherein
First power supply circuit includes the first reference voltage source and the first diode, and the input terminal of first diode connects
First reference voltage source, output end judge that the output end of sub-circuit is connect with the excess temperature；
Second power supply circuit includes the thermistor and ground resistance of the second reference voltage source, negative temperature coefficient, the heat
The first end of quick resistance is connect with the second reference voltage, and second end passes through ground resistance earth；The input terminal of second diode with
The second end of the thermistor connects, and output end judges that the output end of sub-circuit is connect with the excess temperature；
When temperature is equal to the predetermined protection value, partial pressure of second reference voltage on the ground resistance and described the
The voltage value of one reference voltage is equal.
6. according to any one device of Claims 1 to 5, wherein the measurement comparison circuit includes comparator；
The output end that the positive input of the comparator up-samples voltage with controlled circuit is connect, reverse input end and the temperature
The output end connection of voltage follower circuit is controlled, output end is the output end for measuring comparison circuit.
7. according to any one device of Claims 1 to 5, wherein the driving circuit includes latch and transistor；
The signal input part of the latch is connect with the output end for measuring comparison circuit, output end and the transistor
Grid connects；
The transistor is configured as controlling the break-make of the controlled circuit by the signal of the grid.
8. device according to claim 7, wherein
When the signal input part input low level of the latch, and when clock signal input terminal input high level, the latch
The output signal of the signal output end of device makes controlled circuit described in the transistor controls be connected；
When the signal input part input high level of the latch, and when clock signal input terminal input low level, the latch
The output signal of the signal output end of device makes controlled circuit open circuit described in the transistor controls；
When the signal input part input low level of the latch, and when clock signal input terminal input low level, the latch
The signal output end output voltage of device remains unchanged.
9. device according to claim 8, wherein
The transistor is N-type Metal-oxide-semicondutor NMOS tube；
When the signal input part input low level of the latch, and when clock signal input terminal input high level, the latch
The signal output end of device exports high level to the grid of the NMOS tube；
When the signal input part input high level of the latch, and when clock signal input terminal input low level, the latch
The signal output end of device exports low level to the grid of the NMOS tube.
10. device according to claim 8, wherein
The transistor is p-type Metal-oxide-semicondutor PMOS tube；
When the signal input part input low level of the latch, and when clock signal input terminal input high level, the latch
The signal output end of device exports low level to the grid of the PMOS tube；
When the signal input part input high level of the latch, and when clock signal input terminal input low level, the latch
The signal output end of device exports high level to the grid of the PMOS tube.
11. a kind of Switching Power Supply, including：
Switching Power Supply main circuit；With,
Over-temperature protection device described in claim 1~10 any one is configured as carrying out the Switching Power Supply main circuit
Overheat protector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820196663.9U CN208046448U (en) | 2018-02-05 | 2018-02-05 | Over-temperature protection device and Switching Power Supply |
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|---|---|---|---|
| CN201820196663.9U CN208046448U (en) | 2018-02-05 | 2018-02-05 | Over-temperature protection device and Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092498A (en) * | 2018-02-05 | 2018-05-29 | 珠海格力电器股份有限公司 | Over-temperature protection device and method and switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092498A (en) * | 2018-02-05 | 2018-05-29 | 珠海格力电器股份有限公司 | Over-temperature protection device and method and switching power supply |
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