CN109193570A - A kind of threshold variable hardware protection circuit of protection - Google Patents
A kind of threshold variable hardware protection circuit of protection Download PDFInfo
- Publication number
- CN109193570A CN109193570A CN201811350835.4A CN201811350835A CN109193570A CN 109193570 A CN109193570 A CN 109193570A CN 201811350835 A CN201811350835 A CN 201811350835A CN 109193570 A CN109193570 A CN 109193570A
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- Prior art keywords
- comparator
- signal
- pwm signal
- pwm
- circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of threshold variable hardware protection circuits of protection, meet the needs of practical application so that the modification of prefabricated voltage is convenient and efficient by the threshold voltage that the duty ratio of software modification pwm signal adjusts comparator.Pwm signal is connected after the negative input end connection RC filter circuit of comparator, the cutoff frequency design value of the RC filter circuit is lower than the carrier frequency of PWM, pwm signal becomes stable threshold voltage signal after RC circuit filtering, the pwm signal is generated by control chip, changes duty ratio by the software of setting, the positive input terminal of comparator connects measured voltage signal, for the output end of the comparator for exporting fault-signal in high level, the output end of comparator does not export fault-signal in low level.
Description
Technical field
The present invention relates to the technical field of hardware protection circuit, specially a kind of threshold variable hardware protection electricity of protection
Road.
Background technique
It is provided with hardware protection circuit in electric machine controller, when measured voltage signal is higher than certain threshold voltage, passes through ratio
Compared with device U1A fault-signal is generated, error protection is used for.Threshold voltage is by reference to voltage V1Partial pressure obtains.As shown in Figure 1, working as
Measured signal voltage is higher than V1R2/(R1+R2) when, comparator U1Export high level；When measured signal voltage is lower than V1R2/(R1+R2)
When, comparator U1Low level is exported, the fault-signal exported by detection comparator, it can be determined that measured voltage signal and threshold value
The size relation of voltage.Change threshold voltage needs to change V1、R1And R2Value, it is inconvenient that practical application exists.
Summary of the invention
In view of the above-mentioned problems, being repaired the present invention provides a kind of threshold variable hardware protection circuit of protection by software
The threshold voltage for changing the duty ratio adjustment comparator of pwm signal meets practical so that the modification of prefabricated voltage is convenient and efficient
The demand of application.
A kind of threshold variable hardware protection circuit of protection, it is characterised in that: the negative input end connection RC filtering of comparator
Pwm signal is connected after circuit, the cutoff frequency design value of the RC filter circuit is lower than the carrier frequency of PWM, and pwm signal is through RC
Become stable threshold voltage signal after circuit filtering, the pwm signal is generated by control chip, changed by the software of setting
Duty ratio, the positive input terminal of comparator connect measured voltage signal, and the output end of the comparator in high level for exporting
The output end of fault-signal, comparator does not export fault-signal in low level.
It is further characterized by: the negative input end of the comparator is parallel with two-way route, wherein connection all the way
Pwm signal is connected after certain value resistance R3, is grounded after the another way connection capacitor C1, so that the negative input end of comparator
Specially pwm signal and RC filter circuit；
Equivalence principle according to area, PWM duty cycle is bigger, then the threshold voltage after RC circuit filtering is higher, pwm signal by
Control chip generates, changes its duty ratio by software, realizes and adjusts comparator by the duty ratio of software modification pwm signal
Threshold voltage.
After applying the present invention, the positive input terminal voltage of comparator be greater than negative input end voltage when comparator generate high level,
And then fault-signal is exported, comparator generates low level, not defeated when the positive input terminal voltage of comparator is less than negative input end voltage
Be out of order signal；The circuit generates protection threshold voltage by pwm signal and RC filter circuit, passes through software modification pwm signal
Duty ratio realize modification to threshold voltage；It can be by the threshold voltage of software modification hardware protection circuit, for not
Same hardware protection threshold requirement, it is not necessary to modify hardware circuits, only need to modify software parameter, improve hardware protection circuit
Applicability；So that the modification of prefabricated voltage is convenient and efficient, meets the needs of practical application.
Detailed description of the invention
Fig. 1 is existing hardware protection circuit structure schematic diagram；
Fig. 2 is hardware protection circuit structure schematic diagram of the invention.
Specific embodiment
It is a kind of to protect threshold variable hardware protection circuit, seeing Fig. 2: the negative input end connection RC filter circuit of comparator U1
After connect pwm signal, the cutoff frequency design value of RC filter circuit is lower than the carrier frequency of PWM, and pwm signal is through RC circuit filtering
Become stable threshold voltage signal afterwards, pwm signal is generated by control chip, changes duty ratio by the software of setting, compared
The positive input terminal of device U1 connects measured voltage signal, and the output end of comparator U1 is used to export fault-signal in high level, than
Output end compared with device U1 does not export fault-signal in low level.
The negative input end of comparator U1 is parallel with two-way route, wherein connecting after connection certain value resistance R3 all the way
Pwm signal is grounded after another way connection capacitor C1, so that the negative input end of comparator U1 is specially pwm signal and RC filter
Wave circuit；
Equivalence principle according to area, PWM duty cycle is bigger, then the threshold voltage after RC circuit filtering is higher, pwm signal by
Control chip generates, changes its duty ratio by software, realizes and adjusts comparator by the duty ratio of software modification pwm signal
Threshold voltage.
PMW is the english abbreviation of pulse width modulation in text.
Its working principles are as follows: comparator U1 generates height when the positive input terminal voltage of comparator U1 is greater than negative input end voltage
Level and then output fault-signal, comparator U1 is generated low when the positive input terminal voltage of comparator U1 is less than negative input end voltage
Level does not export fault-signal；The circuit generates protection threshold voltage by pwm signal and RC filter circuit；It is repaired by software
Change modification of the duty ratio realization of pwm signal to threshold voltage；It can pass through the threshold value electricity of software modification hardware protection circuit
Pressure, for different hardware protection threshold requirements, it is not necessary to modify hardware circuits, only need to modify software parameter, improve hard
The applicability of part protection circuit.
Specific embodiments of the present invention are described in detail above, but content is only the preferable implementation of the invention
Example, should not be considered as limiting the invention the practical range of creation.It is all to become according to equalization made by the invention application range
Change and improve etc., it shall still fall within the scope of this patent.
Claims (3)
1. a kind of threshold variable hardware protection circuit of protection, it is characterised in that: the negative input end of comparator connects RC filtered electrical
Pwm signal is connected behind road, the cutoff frequency design value of the RC filter circuit is lower than the carrier frequency of PWM, and pwm signal is through RC electricity
Become stable threshold voltage signal after the filtering of road, the pwm signal is generated by control chip, accounted for by the software change of setting
Empty ratio, the positive input terminal of comparator connect measured voltage signal, and the output end of the comparator is used to export event in high level
Hinder signal, the output end of comparator does not export fault-signal in low level.
2. a kind of threshold variable hardware protection circuit of protection as described in claim 1, it is characterised in that: the comparator
Negative input end is parallel with two-way route, wherein connecting pwm signal, another route after connection certain value resistance R3 all the way
It is grounded after road connection capacitor C1, so that the negative input end of comparator is specially pwm signal and RC filter circuit.
3. a kind of threshold variable hardware protection circuit of protection as claimed in claim 1 or 2, it is characterised in that: according to area
Equivalence principle, PWM duty cycle is bigger, then the threshold voltage after RC circuit filtering is higher, and pwm signal is generated by control chip, is logical
It crosses software and changes its duty ratio, realize the threshold voltage for adjusting comparator by the duty ratio of software modification pwm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350835.4A CN109193570A (en) | 2018-11-14 | 2018-11-14 | A kind of threshold variable hardware protection circuit of protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350835.4A CN109193570A (en) | 2018-11-14 | 2018-11-14 | A kind of threshold variable hardware protection circuit of protection |
Publications (1)
| Publication Number | Publication Date |
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| CN109193570A true CN109193570A (en) | 2019-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201811350835.4A Pending CN109193570A (en) | 2018-11-14 | 2018-11-14 | A kind of threshold variable hardware protection circuit of protection |
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| CN (1) | CN109193570A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917304A (en) * | 2020-08-10 | 2020-11-10 | 北京新雷能科技股份有限公司 | Digital power supply |
| CN111983282A (en) * | 2020-08-20 | 2020-11-24 | 青岛鼎信通讯股份有限公司 | Detection circuit applied to power electronic transformer power module resonant current |
| CN112255542A (en) * | 2020-09-30 | 2021-01-22 | 潍柴动力股份有限公司 | Fault diagnosis method and device for PWM (pulse-width modulation) driving load and driving system |
| CN116937522A (en) * | 2023-07-14 | 2023-10-24 | 杭州科丰电子股份有限公司 | Intelligent switch overvoltage protection method, device, system, electronic device and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102460947A (en) * | 2009-04-04 | 2012-05-16 | 戴森技术有限公司 | Current controller for an electric machine |
| CN102709872A (en) * | 2012-05-24 | 2012-10-03 | 华为技术有限公司 | Overvoltage protection control device and method |
| CN203086113U (en) * | 2013-01-23 | 2013-07-24 | 漳州科华技术有限责任公司 | Protection circuit allowing setting of protection threshold |
| CN105811356A (en) * | 2016-04-25 | 2016-07-27 | 珠海格力电器股份有限公司 | Protection circuit and circuit protection method and apparatus |
| CN206313746U (en) * | 2016-12-29 | 2017-07-07 | 深圳玩智商科技有限公司 | A kind of voltage comparator |
-
2018
- 2018-11-14 CN CN201811350835.4A patent/CN109193570A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102460947A (en) * | 2009-04-04 | 2012-05-16 | 戴森技术有限公司 | Current controller for an electric machine |
| CN102709872A (en) * | 2012-05-24 | 2012-10-03 | 华为技术有限公司 | Overvoltage protection control device and method |
| CN203086113U (en) * | 2013-01-23 | 2013-07-24 | 漳州科华技术有限责任公司 | Protection circuit allowing setting of protection threshold |
| CN105811356A (en) * | 2016-04-25 | 2016-07-27 | 珠海格力电器股份有限公司 | Protection circuit and circuit protection method and apparatus |
| CN206313746U (en) * | 2016-12-29 | 2017-07-07 | 深圳玩智商科技有限公司 | A kind of voltage comparator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917304A (en) * | 2020-08-10 | 2020-11-10 | 北京新雷能科技股份有限公司 | Digital power supply |
| CN111983282A (en) * | 2020-08-20 | 2020-11-24 | 青岛鼎信通讯股份有限公司 | Detection circuit applied to power electronic transformer power module resonant current |
| CN112255542A (en) * | 2020-09-30 | 2021-01-22 | 潍柴动力股份有限公司 | Fault diagnosis method and device for PWM (pulse-width modulation) driving load and driving system |
| CN116937522A (en) * | 2023-07-14 | 2023-10-24 | 杭州科丰电子股份有限公司 | Intelligent switch overvoltage protection method, device, system, electronic device and storage medium |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190111 |