CN107394746A - A kind of protection circuit with return difference - Google Patents
A kind of protection circuit with return difference Download PDFInfo
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- CN107394746A CN107394746A CN201710820394.9A CN201710820394A CN107394746A CN 107394746 A CN107394746 A CN 107394746A CN 201710820394 A CN201710820394 A CN 201710820394A CN 107394746 A CN107394746 A CN 107394746A
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- comparator
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- protection circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
The present invention proposes a kind of protection circuit with return difference, including：Comparator, the in-phase input end of comparator are connected to the output end of temperature detecting unit, and inverting input is connected to the output end of circuit parameter design unit；The input of temperature detecting unit and the first power electric connection, for detecting by the temperature of protection device；The input of circuit parameter design unit electrically connects with second source, for determining preset parameter value to determine that comparator output terminal exports low level moment；Return difference setup unit, return difference setup unit is serially connected between the in-phase input end of comparator and the output end of comparator, started working when the output end of comparator exports low level, the power cut-off when the output end of comparator exports high level, for setup parameter return difference value.The hardware protection circuit that the present invention designs, there is return difference set-up function, reached with software detection identical function, realize in the case of software resource deficiency complete return difference set-up function circuit protection.
Description
Technical field
The present invention relates to circuit protection technical field, in particular to a kind of protection circuit with return difference.
Background technology
Protection circuit is a kind of module of limiting circuit output, refer to reach in the parameter state involved by circuit or
The state using the upper limit is closed on, is conveniently divided into quick response and slow response in the reaction time of protection, this is needed according to protection
Priority and importance determine；The detection mode of protection is divided into software AD detections and hardware detection, and similar parameters are protected at present
Protection circuit can only go setting protection return difference value by software.
Therefore, how to design it is a kind of there is the pure hardware protection circuit with return difference set-up function, reach and software detection phase
Same function turns into urgent problem to be solved.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art or correlation technique.
Therefore, the present invention proposes a kind of protection circuit with return difference.
In view of this, a kind of protection circuit with return difference is proposed according to the present invention, including：Comparator, comparator it is same
Phase input is connected to the output end of temperature detecting unit, and the inverting input of comparator is connected to circuit parameter design unit
Output end；The input of temperature detecting unit and the first power electric connection, for detecting by the temperature of protection device；Circuit parameter
The input of design cell electrically connects with second source, for determining preset parameter value to determine that comparator output terminal exports low electricity
At the time of flat；Return difference setup unit, return difference setup unit be serially connected in comparator in-phase input end and comparator output end it
Between, return difference setup unit is started working when the output end of comparator exports low level, in the high electricity of output end output of comparator
Usually power cut-off, return difference setup unit are used for setup parameter return difference value.
Protection circuit provided by the invention with return difference, including comparator, temperature detecting unit, circuit parameter design unit
With return difference setup unit, circuit connecting relation is：The in-phase input end of comparator is connected to the output end of temperature detecting unit, than
Inverting input compared with device is connected to the output end of circuit parameter design unit, directly steady using the protection circuit of comparator design
Qualitative more preferable, accuracy is higher, the simple protective circuit such as built using discrete component, and circuit debugging is complicated, and cost is significantly
Rise, reliability reduces；The input of temperature detecting unit and the first power electric connection, return difference setup unit are serially connected in comparator
In-phase input end and comparator output end between, the operation principle of the circuit is：Temperature detecting unit, which is used to detect, to be protected
The temperature of protection unit, the parameter of detecting element fill with having one-to-one relationship by the temperature of protection device when by protection
When the temperature put changes, the parameter of the detecting element in temperature detecting unit also changes accordingly, and comparator is used for
The size of the output end voltage of C.T detection unit output end voltage and circuit parameter design unit, when not up to circuit is joined
Before the parameter value protection point of number design cell setting, i.e. temperature detecting unit output end voltage is than circuit parameter design unit
Comparator exports high level when output end voltage is big, and return difference setup unit does not work, and is set when reaching circuit parameter design unit
Parameter value protection point when, i.e., temperature detecting unit output end voltage than circuit parameter design unit output end voltage hour,
Comparator output terminal inverts, and exports low level, and return difference setup unit is connected in parallel to temperature detecting unit, and starting working, it is new to be formed
Operational factor, now protection circuit enter guard mode, and sustainable protection state, with temperature detecting unit detection member
Part gradually recovers, and the circuit exits guard mode, in this way, the hardware protection circuit, realizes the function of return difference setting, reach
With software detection identical function, the circuit protection that return difference set-up function is completed in the case of software resource deficiency is realized.
According to the above-mentioned protection circuit with return difference of the present invention, there can also be following technical characteristic：
In the above-mentioned technical solutions, it is preferable that temperature detecting unit includes：First resistor R1, first resistor R1One end with
First power electric connection, first resistor R1The other end electrically connected with the in-phase input end of comparator；Second resistance R2, the second electricity
Hinder R2One end electrically connected with the in-phase input end of comparator, second resistance R2The other end electrically connected with ground terminal；Wherein, second
Resistance R2Resistance change with the temperature change by protection device.
In the technical scheme, temperature detecting unit includes first resistor R1With second resistance R2, physical circuit annexation
For：First resistor R1One end and the first power electric connection, first resistor R1The other end and the in-phase input end of comparator be electrically connected
Connect, second resistance R2One end electrically connected with the in-phase input end of comparator, second resistance R2The other end electrically connected with ground terminal,
Second resistance R2Resistance change with the temperature change by protection device, therefore, comparator normal phase input end voltage is constantly sent out
Changing, the voltage of comparator inverting input is set by circuit parameter design unit so that by the temperature of protection device
During beyond preset range, second resistance R2The voltage at both ends is that comparator normal phase input end voltage is less than anti-phase input terminal voltage,
So that return difference setup unit is connected in parallel to second resistance R2Both ends, so as to realize the protection circuit of return difference set-up function.
In any of the above-described technical scheme, it is preferable that second resistance R2For negative tempperature coefficient thermistor.
In the technical scheme, second resistance R2For negative tempperature coefficient thermistor, when higher by protection device temperature,
Two resistance R2Resistance it is smaller, comparator positive input voltage is also smaller, when reaching preset value by protection device temperature, accordingly
Set comparator to export to invert, realize by the temperature control of protection device.
In any of the above-described technical scheme, it is preferable that circuit parameter design unit includes：3rd resistor R3, 3rd resistor R3
One end electrically connected with second source, 3rd resistor R3The other end electrically connected with the inverting input of comparator；4th resistance
R4, the 4th resistance R4One end electrically connected with the inverting input of comparator, the 4th resistance R4The other end electrically connected with ground terminal.
In the technical scheme, circuit parameter design unit includes 3rd resistor R3The 4th resistance R4, circuit connecting relation
For：3rd resistor R3One end electrically connected with second source, 3rd resistor R3The other end and the inverting input of comparator be electrically connected
Connect, the 4th resistance R4One end electrically connected with the inverting input of comparator, the 4th resistance R4The other end electrically connected with ground terminal,
Circuit parameter, setting 3rd resistor R can be arranged as required to3The 4th resistance R4Resistance, such as
Enter defencive function when phase input voltage is larger, then the 4th resistance R is set4Resistance it is relatively larger, it is necessary in comparator just
Enter defencive function when phase input voltage is smaller, then the 4th resistance R is set4Resistance it is relatively smaller, set the suitable 3rd
Resistance R3The 4th resistance R4Resistance so that reach need inlet point to be protected when enter defencive function.
In any of the above-described technical scheme, it is preferable that circuit parameter design unit also includes：First electric capacity C1, the first electricity
Hold C1With the 4th resistance R4It is in parallel.
In the technical scheme, circuit parameter design unit also includes the first electric capacity C1, itself and the 4th resistance R4Parallel connection, it is real
The effect now filtered so that circuit enters more accurate at the time of protection point.
In any of the above-described technical scheme, it is preferable that return difference setup unit includes：5th resistance R5, the 5th resistance R5Resistance
Value is set according to parameter return difference value.
In the technical scheme, return difference setup unit includes the 5th resistance R5, the 5th resistance R5Only in the output of comparator
End invert, export low level when just start-up operation, and with second resistance R2Parallel connection, the operational factor new from this formation are real
Existing return difference set-up function, the 5th resistance R5Resistance set according to the return difference value for being actually needed setting, it is suitable by setting
5th resistance R5Resistance realize required return difference value.
In any of the above-described technical scheme, it is preferable that return difference setup unit also includes：Diode, diode and the 5th electricity
Hinder R5The positive input of comparator and the output end of comparator are connected to after series connection, diode is high electricity in comparator output terminal
Usually it is not turned on, is turned in the output end low level of comparator.
In the technical scheme, the return difference setup unit of the protection circuit with return difference needs in comparator output terminal to be height
It is not turned on, is turned in the output end low level of comparator, then by the 5th resistance R during level5Series connection one is unidirectionally led
Logical diode realizes return difference setup unit when needing to enter defencive function, just starts working, and realizes that return difference is set.
In any of the above-described technical scheme, it is preferable that the magnitude of voltage of the first power supply is equal with the magnitude of voltage of second source,
For preset value Vcc.
In the technical scheme, a preferable scheme is given：The magnitude of voltage of first power supply and the voltage of second source
It is worth equal, then the first resistor R of selection1, second resistance R2, 3rd resistor R3The 4th resistance R4Magnitude it is typically identical, resistance
It is worth that size typically difference is smaller, and more time saving and energy saving when selecting resistance device, precision is higher at the time of circuit enters defencive function.
In any of the above-described technical scheme, it is preferable that preset parameter value is：Va=Vcc × { R4/(R3+R4)}。
In the technical scheme, show in particular preset parameter value, when the output voltage of temperature sensing circuit reach Vcc ×
{R4/(R3+R4) when, comparator output terminal output low level, return difference setup unit is incorporated to circuit work.
In any of the above-described technical scheme, it is preferable that parameter return difference value is：Vb=Va-Vcc×R6/(R1+R6), wherein, R6
=R2R5/(R2+R5)。
In the technical scheme, parameter return difference value is show in particular, when return difference setup unit is incorporated to circuit work, circuit shape
Cheng Xin operational factor, now parameter return difference value is Va-Vcc×R6/(R1+R6), realize return difference set-up function.
The additional aspect and advantage of the present invention will become obvious in following description section, or the practice by the present invention
Recognize.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 shows the structural representation of the protection circuit with return difference of one embodiment of the present of invention；
Fig. 2 shows the circuit diagram of the protection circuit with return difference of one embodiment of the present of invention.
Reference：
Wherein, the corresponding relation between the reference in Fig. 1,2 and component names is：
10 comparators, 20 temperature detecting units, 202 first resistor R1, 204 second resistance R2, 30 circuit parameter design lists
Member, 302 3rd resistor R3, 304 the 4th resistance R4, 306 first electric capacity C1, 40 return difference setup units, 402 the 5th resistance R5, 404
Diode, 50 first power supplys, 60 second sources.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be different from other modes described here using other to implement, therefore, protection scope of the present invention is not limited to following public affairs
The limitation for the specific embodiment opened.
One embodiment of the present of invention, propose that a kind of protection circuit Fig. 1 with return difference shows the implementation of the present invention
The structural representation of the protection circuit with return difference of example, the protection circuit with return difference include：The in-phase input end of comparator 10 connects
The output end of temperature detecting unit 20 is connected to, the inverting input of comparator 10 is connected to the output of circuit parameter design unit 30
End；The input of temperature detecting unit 20 electrically connects with the first power supply 50, for detecting by the temperature of protection device；Circuit parameter
The input of design cell 30 electrically connects with second source 60, for determining preset parameter value to determine that the output end of comparator 10 is defeated
Go out the low level moment；Return difference setup unit 40, return difference setup unit 40 are serially connected in the in-phase input end of comparator 10 compared with
Between the output end of device 10, return difference setup unit 40 is started working when the output end of comparator 10 exports low level, is being compared
Power cut-off during the output end output high level of device 10, return difference setup unit 40 are used for setup parameter return difference value.
Protection circuit provided by the invention with return difference, including comparator 10, temperature detecting unit 20, circuit parameter design
Unit 30 and return difference setup unit 40, circuit connecting relation are：The in-phase input end of comparator 10 is connected to temperature detecting unit
20 output end, the inverting input of comparator 10 are connected to the output end of circuit parameter design unit 30, and direct use is compared
The protection circuit stability that device 10 designs is more preferable, and accuracy is higher, the simple protective circuit such as built using discrete component, electricity
Road debugging is complicated, and cost rises significantly, and reliability reduces；The input of temperature detecting unit 20 electrically connects with the first power supply 50,
Return difference setup unit 40 is serially connected between the in-phase input end of comparator 10 and the output end of comparator 10, and the work of the circuit is former
Reason is：Temperature detecting unit 20 is used to detect by the temperature of protection device, the parameter of detecting element and the temperature by protection device
With one-to-one relationship, therefore when being changed by the temperature of protection device, the detecting element in temperature detecting unit 20
Parameter also change accordingly, comparator 10 is used for the output end voltage of C.T detection unit 20 and circuit parameter design
The size of the output end voltage of unit 30, before the parameter value protection point that not up to circuit parameter design unit 30 is set, i.e.,
Comparator 10 exports high electricity when the output end voltage of temperature detecting unit 20 is bigger than the output end voltage of circuit parameter design unit 30
Flat, return difference setup unit 40 is not worked, and when reaching the parameter value protection point of the setting of circuit parameter design unit 30, i.e., temperature is examined
Output end voltage hour of the output end voltage of unit 20 than circuit parameter design unit 30 is surveyed, the output end of comparator 10 occurs anti-
Turning, export low level, return difference setup unit 40 is connected in parallel to temperature detecting unit 20, and start-up operation forms new operational factor, this
When protection circuit enter guard mode, and sustainable protection state, as the detecting element in temperature detecting unit 20 gradually recovers,
The circuit exits guard mode, in this way, the hardware protection circuit, realizes the function of return difference setting, has reached and software detection
Identical function, realize the circuit protection that return difference set-up function is completed in the case of software resource deficiency.
According to the above-mentioned protection circuit with return difference of the present invention, there can also be following technical characteristic：
In one embodiment of the invention, it is preferable that such as Fig. 2, temperature detecting unit 20 includes：First resistor R1202,
First resistor R1202 one end electrically connects with the first power supply 50, first resistor R1202 other end is same mutually defeated with comparator 10
Enter end electrical connection；Second resistance R2204, second resistance R2204 one end electrically connects with the in-phase input end of comparator 10, and second
Resistance R2204 other end electrically connects with ground terminal；Wherein, second resistance R2204 resistance with the temperature change by protection device and
Change.
In this embodiment, temperature detecting unit 20 includes first resistor R1202 and second resistance R2204, physical circuit connects
The relation of connecing is：First resistor R1202 one end electrically connects with the first power supply 50, first resistor R1202 other end and comparator 10
In-phase input end electrical connection, second resistance R2204 one end electrically connects with the in-phase input end of comparator 10, second resistance
R2204 other end electrically connects with ground terminal, second resistance R2204 resistance changes with the temperature change by protection device, because
This, the normal phase input end voltage of comparator 10 constantly changes, and it is anti-phase to set comparator 10 by circuit parameter design unit 30
The voltage of input so that when exceeding preset range by the temperature of protection device, second resistance R2The voltage at 204 both ends compares
It is less than anti-phase input terminal voltage compared with the normal phase input end voltage of device 10 so that return difference setup unit 40 is connected in parallel to second resistance R2204
Both ends, so as to realize the protection circuit of return difference set-up function.
In one embodiment of the invention, it is preferable that second resistance R2204 be negative tempperature coefficient thermistor.
In this embodiment, second resistance R2204 be negative tempperature coefficient thermistor, when higher by protection device temperature,
Second resistance R2Resistance it is smaller, the positive input voltage of comparator 10 is also smaller, when reaching preset value, phase by protection device temperature
The output of setting comparator 10 answered inverts, and realizes by the temperature control of protection device.
In one embodiment of the invention, it is preferable that such as Fig. 2, circuit parameter design unit 30 includes：3rd resistor
R3302,3rd resistor R3302 one end electrically connects with second source 60,3rd resistor R3302 other end and comparator 10
Inverting input electrically connects；4th resistance R4304, the 4th resistance R4304 one end and the inverting input of comparator 10 are electrically connected
Connect, the 4th resistance R4304 other end electrically connects with ground terminal.
In this embodiment, circuit parameter design unit 30 includes 3rd resistor R3The 4th resistance R4, circuit connecting relation
For：3rd resistor R3302 one end electrically connects with second source 60,3rd resistor R3302 other end is anti-phase with comparator 10
Input electrically connects, the 4th resistance R4304 one end electrically connects with the inverting input of comparator 10, the 4th resistance R4304 it is another
One end electrically connects with ground terminal, can be arranged as required to circuit parameter, setting 3rd resistor R3302 the 4th resistance R4304 resistance
Value, such as, it is necessary to enter defencive function when the positive input voltage of comparator 10 is larger, then the 4th resistance R of setting4304 resistance
It is worth relatively larger, it is necessary to enter defencive function when the positive input voltage of comparator 10 is smaller, then the 4th resistance R is set4304
Resistance it is relatively smaller, suitable 3rd resistor R is set3302 the 4th resistance R3044Resistance so that need to protect reaching
Enter defencive function during the inlet point of shield.
In one embodiment of the invention, it is preferable that such as Fig. 2, circuit parameter design unit 30 also includes：First electric capacity
C1306, the first electric capacity C1306 and the 4th resistance R4304 is in parallel.
In this embodiment, circuit parameter design unit 30 also includes the first electric capacity C1306, itself and the 4th resistance R4304 simultaneously
Connection, realizes the effect of filtering so that circuit enters more accurate at the time of protection point.
In one embodiment of the invention, it is preferable that such as Fig. 2, return difference setup unit 40 includes：5th resistance R5402,
5th resistance R5402 resistance is set according to parameter return difference value.
In this embodiment, return difference setup unit 40 includes the 5th resistance R5402, the 5th resistance R5402 only in comparator
10 output end inverts, export low level when just start-up operation, and with second resistance R2Parallel connection, the operation new from this formation
Parameter, realize return difference set-up function, the 5th resistance R5402 resistance is set according to the return difference value for being actually needed setting, is passed through
Suitable 5th resistance R is set5402 resistance realizes required return difference value.
In one embodiment of the invention, preferably as Fig. 2, return difference setup unit 40 also include：Diode 404, two
The resistance R of pole pipe 404 and the 5th5The positive input of comparator 10 and the output end of comparator 10, two poles are connected to after 402 series connection
Pipe 404 is not turned on when the output end of comparator 10 is high level, is turned in the output end low level of comparator 10.
In this embodiment, the return difference setup unit 40 of the protection circuit with return difference need be in the output end of comparator 10
It is not turned on, is turned in the output end low level of comparator 10, then by the 5th resistance R during high level5402 series connection one
The diode 404 of one-way conduction realizes return difference setup unit 40 when needing to enter defencive function, just starts working, realizes back
Difference setting.
In one embodiment of the invention, it is preferable that such as Fig. 2, magnitude of voltage and the second source 60 of the first power supply 50
Magnitude of voltage is equal, is preset value Vcc.
In this embodiment, a preferable scheme is given：The magnitude of voltage of first power supply 50 and the electricity of second source 60
Pressure value is equal, then the first resistor R of selection1202nd, second resistance R2204th, 3rd resistor R3302 the 4th resistance R4304
Magnitude is typically identical, and resistance size typically difference is smaller, more time saving and energy saving when selecting resistance device, circuit enter defencive function when
It is higher to carve precision.
In one embodiment of the invention, it is preferable that preset parameter value is：Va=Vcc × { R4/(R3+R4)}。
In this embodiment, show in particular preset parameter value, when the output voltage of temperature sensing circuit reach Vcc ×
{R4/(R3+R4) when, the output end of comparator 10 output low level, return difference setup unit 40 is incorporated to circuit work.
In one embodiment of the invention, it is preferable that parameter return difference value is：Vb=Va-Vcc×R6/(R1+R6), wherein,
R6=R2R5/(R2+R5)。
In this embodiment, parameter return difference value is show in particular, when return difference setup unit 108 is incorporated to circuit work, circuit
New operational factor is formed, now parameter return difference value is Va-Vcc×R6/(R1+R6), realize return difference set-up function.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean to combine at least one reality that specific features, structure, material or the feature that the embodiment or example describe are contained in the present invention
Apply in example or example.In this manual, identical embodiment or reality are not necessarily referring to the schematic representation of above-mentioned term
Example.Moreover, description specific features, structure, material or feature can in any one or more embodiments or example with
Suitable mode combines.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. protection circuit with return difference, it is characterised in that including：Comparator, the in-phase input end of the comparator are connected to the output end of temperature detecting unit, the comparator it is anti-phase Input is connected to the output end of circuit parameter design unit；The input of the temperature detecting unit and the first power electric connection, for detecting by the temperature of protection device；The input of the circuit parameter design unit electrically connects with second source, for determining preset parameter value with described in determining Comparator output terminal exports the low level moment；Return difference setup unit, the return difference setup unit are serially connected in the defeated of the in-phase input end of the comparator and the comparator Go out between end, the return difference setup unit is started working when the output end of the comparator exports low level, in the comparison Power cut-off during the output end output high level of device, the return difference setup unit are used for setup parameter return difference value.
- 2. the protection circuit according to claim 1 with return difference, it is characterised in thatThe temperature detecting unit includes：First resistor R1, the first resistor R1One end and first power electric connection, the first resistor R1The other end Electrically connected with the in-phase input end of the comparator；Second resistance R2, the second resistance R2One end electrically connected with the in-phase input end of the comparator, the second resistance R2The other end electrically connected with ground terminal；Wherein, the second resistance R2Resistance change with the temperature change by protection device.
- 3. the protection circuit according to claim 2 with return difference, it is characterised in thatThe second resistance R2For negative tempperature coefficient thermistor.
- 4. the protection circuit according to claim 1 with return difference, it is characterised in thatThe circuit parameter design unit includes：3rd resistor R3, the 3rd resistor R3One end electrically connected with the second source, the 3rd resistor R3The other end Electrically connected with the inverting input of the comparator；4th resistance R4, the 4th resistance R4One end electrically connected with the inverting input of the comparator, the 4th resistance R4The other end electrically connected with ground terminal.
- 5. the protection circuit according to claim 4 with return difference, it is characterised in thatThe circuit parameter design unit also includes：First electric capacity C1, the first electric capacity C1With the 4th resistance R4It is in parallel.
- 6. the protection circuit according to claim 1 with return difference, it is characterised in thatThe return difference setup unit includes：5th resistance R5, the 5th resistance R5Resistance set according to the parameter return difference value.
- 7. the protection circuit according to claim 6 with return difference, it is characterised in thatThe return difference setup unit also includes：Diode, the diode and the 5th resistance R5Be connected to after series connection the positive input of the comparator with it is described The output end of comparator, the diode is not turned on when comparator output terminal is high level, in the output end of the comparator To be turned on during low level.
- 8. the protection circuit according to any one of claim 1 to 7 with return difference, it is characterised in thatThe magnitude of voltage of first power supply is equal with the magnitude of voltage of the second source, is preset value Vcc.
- 9. the protection circuit according to claim 8 with return difference, it is characterised in thatThe preset parameter value is：Va=Vcc × { R4/(R3+R4)}。
- 10. the protection circuit according to claim 9 with return difference, it is characterised in thatThe parameter return difference value is：Vb=Va-Vcc×R6/(R1+R6)；Wherein, R6=R2R5/(R2+R5)。
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| CN201710820394.9A CN107394746A (en) | 2017-09-13 | 2017-09-13 | A kind of protection circuit with return difference |
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| CN108303193A (en) * | 2018-04-10 | 2018-07-20 | 国家电网公司 | A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter |
| CN108445928A (en) * | 2018-04-23 | 2018-08-24 | 海信（山东）空调有限公司 | A kind of temperature-control circuit and frequency-variable controller of IPM |
| CN109450416A (en) * | 2018-10-19 | 2019-03-08 | 福建和盛高科技产业有限公司 | A kind of high-current low-voltage difference diode equivalent circuit based on metal-oxide-semiconductor |
| CN110925231A (en) * | 2019-11-08 | 2020-03-27 | 漳州科华技术有限责任公司 | Fan failure over-temperature protection method, device and system |
| CN113721517A (en) * | 2021-08-31 | 2021-11-30 | 上海兰宝传感科技股份有限公司 | Return difference setting system and method for proximity switch sensor |
| CN113721517B (en) * | 2021-08-31 | 2024-05-28 | 上海兰宝传感科技股份有限公司 | Proximity switch sensor return difference setting system and method |
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| CN105318984A (en) * | 2014-07-02 | 2016-02-10 | 纬创资通股份有限公司 | Over-temperature detection circuit |
| CN206250750U (en) * | 2016-08-29 | 2017-06-13 | 广州珠峰电气股份有限公司 | transducer brake unit protection circuit |
| CN206364497U (en) * | 2016-12-12 | 2017-07-28 | 北京中瑞蓝科电动汽车技术有限公司 | A kind of motor bearings temperature protection circuit |
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| CN108445928A (en) * | 2018-04-23 | 2018-08-24 | 海信（山东）空调有限公司 | A kind of temperature-control circuit and frequency-variable controller of IPM |
| CN109450416A (en) * | 2018-10-19 | 2019-03-08 | 福建和盛高科技产业有限公司 | A kind of high-current low-voltage difference diode equivalent circuit based on metal-oxide-semiconductor |
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