CN209329672U - Current protection circuit for high-voltage system - Google Patents
Current protection circuit for high-voltage system Download PDFInfo
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- CN209329672U CN209329672U CN201822138523.9U CN201822138523U CN209329672U CN 209329672 U CN209329672 U CN 209329672U CN 201822138523 U CN201822138523 U CN 201822138523U CN 209329672 U CN209329672 U CN 209329672U
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Abstract
The utility model belongs to the technical field of the electronic circuit, a current protection circuit for high-voltage system is provided, supplies power to the load through generating line high-voltage line and generating line low-voltage line to detect the current value of flowing through the generating line high-voltage line, amplify the processing to the current value after then, judge at last when the current value after the amplification processing surpassed preset threshold value, then control and cut off power supply or current-limiting to the load. Therefore, the effect of high-voltage system bus high-voltage line current protection is achieved, the situation that a load damages components due to continuous overlarge current values is avoided, the stability of a high-voltage system is improved, and the problems that the current value flowing through a bus is monitored on a low-voltage side, when the load breaks down, the whole high-voltage system cannot be correspondingly protected due to the fact that current does not flow through a detection component on the low-voltage side, and the components are damaged or the high-voltage system is unsafe are solved.
Description
Technical field
The utility model belongs to electronic circuit technology field more particularly to a kind of current protection electricity for high-pressure system
Road.
Background technique
(such as high power steering gear system, high-power servo, frequency converter, air conditioner numerically-controlled machine tool in a large amount of high-pressure system
Deng), it is assumed that the high-voltage system is divided into " power supply system ", " current detecting system ", " control system " and " load system ",
In order to improve the reliability of high-pressure system, need to realize that the overcurrent protection of its bus current, real-time monitoring flow through the electricity of bus
Flow valuve is controlled, when current value is greater than or equal to the threshold value of design so that the reliability of total system is improved.
Traditional overcurrent protection scheme generallys use the low voltage side in high-pressure system and is monitored the electric current for flowing through bus
Value, realizes its bus current defencive function.
Therefore, there is use to be monitored in low voltage side to flow through for the existing current protection technology for high-pressure system
The current value of bus, when loading failure because the detecting element that electric current does not flow through low voltage side leads to not to whole height
Pressure system is correspondingly protected, to component damage or the unsafe problem of high-pressure system occur.
Utility model content
The purpose of this utility model is to provide a kind of current protecting circuits for high-pressure system, it is intended to solve existing
Current protection technology for high-pressure system works as load there is using the current value for flowing through bus is monitored in low voltage side
It breaks down and electric current does not flow through the detection part of low voltage side and leads to not correspondingly protect integral high pressure system
Shield, to component damage or the unsafe problem of high-pressure system occur.
The utility model provides a kind of current protecting circuit for high-pressure system, and the current protecting circuit includes:
By bus high-voltage line and bus low-voltage line, to the power supply module for loading and being powered；
On the bus high-voltage line, for detecting the detection module for flowing through the current value of the bus high-voltage line；
It is connected with the detection module, for amplifying the signal processing module of processing to the current value；And
It is connected with the signal processing module, the power supply module and the load, for judging the electricity after enhanced processing
When flow valuve is more than the first preset threshold, the control module that cutting power supply or current limliting are carried out to the load is controlled.
A kind of current protecting circuit for high-pressure system provided by the utility model is low by bus high-voltage line and bus
Crimping is powered load, and detects the current value for flowing through bus high-voltage line, then amplifies processing to current value, finally
When judging that the current value after enhanced processing is more than preset threshold, then control carries out cutting power supply or current limliting to load.Thus
The effect for playing the protection of high-pressure system bus high voltage line current avoids loading and damages component due to lasting excessive current value
The case where occur, improve the stability of high-pressure system, solve the existing current protection technology for high-pressure system and exist
Flow through the current value of bus using being monitored in low voltage side, when load break down when because electric current does not flow through low-voltage
The detecting element of side leads to not correspondingly protect integral high pressure system, to component damage or high-pressure system occur
Unsafe problem.
Detailed description of the invention
Fig. 1 is that a kind of modular structure of current protecting circuit for high-pressure system provided by the embodiment of the utility model is shown
It is intended to.
Fig. 2 is a kind of exemplary circuit of current protecting circuit for high-pressure system provided by the embodiment of the utility model
Figure.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Above-mentioned a kind of current protecting circuit for high-pressure system, by high-pressure system bus high-pressure side real-time monitoring
The current value for flowing through the bus, when current value after enhanced processing is greater than preset threshold, control module obtain one it is determining
Digital signal level, the digital signal level can be used for controlling the high-pressure system, so that power supply module or load are controlled,
Realize bus current defencive function.Also, high-pressure system high-voltage side bus electric current is designed based on NPN triode or PNP triode
Protection is beneficial to the control of cost, realizes the current protecting function of high-pressure system, when current value is less than preset threshold (centainly accurately
Spend in range) when, the digital signal level of output is normality level；When the current value of load is greater than preset threshold (centainly accurately
Spend in range) when, export a digital signal level opposite with normality level, digital signal level feedback to control module
(current limliting, Cycle by Cycle control electric current increase, Cycle by Cycle control electric current reduces etc.) is controlled, power supply system voltage value guarantor is conducive to
It holds relatively stable, while loading and will not damage component due to lasting excessive electric current；When short circuit occurs for load, one is exported
The digital signal level opposite with normality level, digital signal level feedback to control system are controlled (cutting power supply, limit
The controls such as stream, Cycle by Cycle limitation electric current), the voltage value for being conducive to power supply module keeps relative stability, and load will not be because continuing
Big current value and damage component.The protection of high-pressure system bus high voltage side current is realized based on NPN triode or PNP triode
Design, a kind of mode of the realization high-pressure system high voltage side current defencive function of high performance-price ratio is provided, to further mention
The cost performance and reliability of high total system.
Fig. 1 shows a kind of module knot of current protecting circuit for high-pressure system provided by the embodiment of the utility model
Structure, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
A kind of above-mentioned current protecting circuit for high-pressure system, the current protecting circuit include power supply module 101, inspection
Survey module 102, signal processing module 104 and control module 105.
Power supply module 101 is powered load 103 by bus high-voltage line and bus low-voltage line.
Detection module 102 is set on the bus high-voltage line, for detecting the current value for flowing through the bus high-voltage line.
Signal processing module 104 is connected with detection module 102, for amplifying processing to the current value.
Control module 105 is connected with signal processing module 104, power supply module 101 and load 103, puts for judging
Big treated when the current value is more than the first preset threshold, and control carries out cutting power supply or current limliting to load 103.
As an embodiment of the present invention, above-mentioned detection module 102 includes resistor.When electric current flows through resistor,
Signal is generated, this signal is typically more small, needs to amplify by the interlock circuit of signal processing module 104, be put
Big value, and then export to control module 105, control module 105 can control load 103 according to the current value detected
(control such as cutting power supply, current limliting, Cycle by Cycle limitation electric current), to protect entire high-pressure system.
As an embodiment of the present invention, above-mentioned detection module 102 is specially isolating device, and the isolating device includes
Hall sensor or transformer.When electric current flows through isolating device, generate signal, this signal is typically more small, need by
The interlock circuit of signal processing module 104 amplifies, the value amplified, and then exports to control module 105, control module
105 can be controlled (control such as cutting power supply, current limliting, Cycle by Cycle limitation electric current) to load 103 according to the current value detected,
To protect entire high-pressure system.
As an embodiment of the present invention, above-mentioned high-pressure system such as high power steering gear system, high-power servo, frequency conversion
Device, central air-conditioning, numerically-controlled machine tool etc., since the high-pressure side in high-pressure system realizes that current protection ratio realizes electric current in low-pressure side
It protects to the protection of total system more comprehensively, is relatively beneficial to the stability of system.When the current value for flowing through high-voltage side bus is less than
When the first preset threshold, the digital signal level of output is normality level, and control module 105 does not do current limliting, and high-pressure system is normal
Work；When such as current detection module using participating in controlling when phase inverter, non-inverting buffer, when the current value for flowing through bus is big
In preset threshold, then a digital signal level opposite with normality level is exported；When current detection module is using having
When MCU, PLC or motion controller of analog input function, when the current value for flowing through bus is greater than the first preset threshold and small
When the second preset threshold, corresponding current limit signal or a digital signal level opposite with normality level are exported.The level
Signal feedback can be controlled power supply module 101 (or load 103) (current limliting, Cycle by Cycle control electric current to control module 105
Increase, Cycle by Cycle control electric current reduces etc.), be conducive to 101 voltage value of power supply module and keep relative stability, load 103 will not be because
Continue excessive electric current and damages component；When short circuit occurs for load 103, the lasting output number electricity opposite with normality level
Ordinary mail number, level signal feedback to control module 105 can carry out cutting power supply to power supply module 101 (or load 103), have
It keeing relative stability conducive to 101 voltage value of power supply module, load will not damage component due to lasting excessive current value, thus
Further increase the stability of system.
Fig. 2 shows a kind of example electricity of the current protecting circuit for high-pressure system provided by the embodiment of the utility model
Road, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
As an embodiment of the present invention, above-mentioned power supply module 101 includes the AC power source with preset voltage value
VCC。
As an embodiment of the present invention, above-mentioned detection module 102 includes first resistor R1, and the of first resistor R1
One termination AC power source VCC, the second terminating load 103 of first resistor R1.
As an embodiment of the present invention, above-mentioned signal processing module 104 includes:
It second resistance R2,3rd resistor R3, the 4th resistance R4, diode D1, first capacitor C1, the second capacitor C2 and opens
Close pipe Q1；
The first termination detection module 102 of second resistance R2, the second end of second resistance R2 and the first of first capacitor C1
The controlled end of end and switching tube Q1 connect altogether, and the input terminal of the second termination switching tube Q1 of first capacitor C1, switching tube Q1's is defeated
Terminate the first end of 3rd resistor R3 out, the second end of 3rd resistor R3, the first end of the 4th resistance R4, the second capacitor C2 the
The cathode of one end and diode D1 connect altogether and connect with control module 105, the second end of the 4th resistance R4 and the second capacitor C2
Second end and diode D1 plus earth.
Specifically, above-mentioned switching tube Q1 be NPN type triode or PNP type triode,
Collector, emitter and the base stage of the NPN type triode are respectively the input terminal of the switching tube Q1, output
End and controlled end；
Emitter, collector and the base stage of the PNP type triode are respectively the input terminal of the switching tube Q1, output
End and controlled end.
Therefore, the detection of high-pressure system bus high voltage side current is realized based on NPN type triode or PNP type triode and its protected
The function of shield, cost is relatively reasonable, is greatly improved cost performance, the reliability of product design, is conducive to be carried out industrialization.
As an embodiment of the present invention, above-mentioned control module 105 is realized using single-chip microprocessor MCU.Certainly, above-mentioned control
Module 105 can also be substituted using non-inverting buffer or phase inverter, as long as being able to achieve and be more than current threshold in the present embodiment
When, the signal value of amplification makes control module 105 export one and normality level adverse effect.Certainly, control module 105
The driving chip with control terminal, programmable logic controller (PLC) or motion controller can also be used to realize.
Below in conjunction with Fig. 1 and Fig. 2, a kind of above-mentioned working principle of the current protecting circuit for high-pressure system is retouched
It states as follows:
Wherein, first resistor R1 can be changed according to actual design current protection threshold value, it is assumed that the electricity of first resistor R1
Resistance value is R, and AC power source VCC connection first resistor R1 is powered load 103；Switching tube Q1 is PNP type triode, switch
Pipe Q1 can carry out the PNP type triode for choosing different electrical parameters again according to the high-voltage value of high-pressure system, it is assumed that switching tube Q1's
Amplification factor is Hfe, selection integrate-emitter-base bandgap grading pressure voltage as the PNP pipe of 200V, amplification factor for 100 PNP type triode；Monolithic
Machine MCU main function is the determining level signal of output, can control output level according to practical application.
When the current value for flowing through first resistor R1 is less than or equal to the current threshold of design, single-chip microprocessor MCU exports low level,
When the current value for flowing through first resistor R1 is greater than or equal to the current threshold of design, single-chip microprocessor MCU exports high level.Work as control
When module 105 is different device, the input voltage threshold value for changing output level is different, it is assumed that and the input voltage threshold value is Uin,
When the input voltage of single-chip microprocessor MCU is less than or equal to Uin, output level is normality level；When the input electricity of single-chip microprocessor MCU
When pressure is greater than Uin, the output of the U1 level opposite with normality level.Such as: when the incoming level of single-chip microprocessor MCU is less than or equal to
When 2V, single-chip microprocessor MCU exports low level；When the input voltage of single-chip microprocessor MCU is greater than 2V, single-chip microprocessor MCU exports high level,
The Ic value of switching tube Q1 is Ic=Uin/R4 at this time, thus can release Ic=2V/1K=2mA；By the databook of switching tube Q1
The base current that Q1 can be released is Ib=Ic/Hfe, then Ib=2mA/100=0.02mA.Accordingly, switching tube Q1 at this time can be released
Emitter-base voltage be U (R1)=Ib*R2+Ueb, so that it is determined that protective current threshold value be I (protection)=U (R1)/R1；More
Convenient and fast method, by the databook of switching tube Q1 it is found that as Ueb=0.6V, Ic=2mA.Accordingly, voltage U (R1) is protected
=0.02mA*1K+0.6V=0.62V, so that protective current value is I (protection)=0.62V/0.015 Ω=41.33A, accordingly
It is emulated, with theoretical calculation, so as to obtain, protection threshold current is 41.33A, when the electric current for flowing through first resistor R1
When less than 41.33A, single-chip microprocessor MCU output low level is supplied to control system, and high-pressure system works normally；It is electric when flowing through first
When hindering the current value of R1 more than or equal to 41.33A, single-chip microprocessor MCU output high level is supplied to control module 104, so that control
Module can be controlled power supply module 101 (or load 103) (control such as cutting power supply, current limliting, Cycle by Cycle limitation electric current), from
And whole system is protected, it is greatly improved the reliability of whole system.
Designed in high-pressure system bus high voltage side current protection system as a result, real-time monitoring flow through the current value of bus into
And the scheme protected, it is a kind of based on PNP type triode or NPN triode by proposing, realize the high electricity of high-pressure system bus
Press the design of side current protecting function.It is assessed in terms of reliability, the low-pressure side bus relative to tradition in high-pressure system is realized
The design of current protecting function, it is wider to the protection scope of total system, it is more advantageous to the reliability requirement of total system；In
From the aspect of cost, high-pressure system bus high-voltage side current protecting function is carried out based on PNP type triode or NPN triode
Design, has price advantage compared with the design of market, this scheme is conducive to the use of extensive high-pressure system, substantially increases total system
Cost performance and reliability.
To sum up, a kind of current protecting circuit for high-pressure system provided by the embodiment of the utility model, passes through bus height
Crimping and bus low-voltage line are powered load, and detect the current value for flowing through bus high-voltage line, then carry out to current value
Enhanced processing, when finally judging that the current value after enhanced processing is more than preset threshold, then control carries out cutting power supply to load
Or current limliting.Thus the effect for playing the protection of high-pressure system bus high voltage line current avoids load because continuing excessive electric current
The case where being worth and damaging component generation improves the stability of high-pressure system, solves the existing electricity for high-pressure system
Stream protection technique is monitored the current value for flowing through bus there is use in low voltage side, when loading failure because of electric current
The detection part for not flowing through low voltage side leads to not correspondingly protect integral high pressure system, to component occur
Damage or the unsafe problem of high-pressure system.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (7)
1. a kind of current protecting circuit for high-pressure system, which is characterized in that the current protecting circuit includes:
By bus high-voltage line and bus low-voltage line, the power supply module that load is powered；
On the bus high-voltage line, for detecting the detection module for flowing through the current value of the bus high-voltage line；
It is connected with the detection module, for amplifying the signal processing module of processing to the current value；And
It is connected with the signal processing module, the power supply module and the load, for judging the institute after enhanced processing
When stating current value more than preset threshold, the control module that cutting power supply or current limliting are carried out to the load is controlled.
2. current protecting circuit as described in claim 1, which is characterized in that the detection module includes resistor.
3. current protecting circuit as described in claim 1, which is characterized in that the detection module is specially isolating device, institute
Stating isolating device includes Hall sensor or transformer.
4. current protecting circuit as described in claim 1, which is characterized in that the power supply module includes having preset voltage value
The power of alterating and direct current of range.
5. current protecting circuit as described in claim 1, which is characterized in that the signal processing module includes:
Second resistance, 3rd resistor, the 4th resistance, diode, first capacitor, the second capacitor and switching tube；
The of the first termination detection module of the second resistance, the second end of the second resistance and the first capacitor
The controlled end of one end and the switching tube connects altogether, the input terminal of the second termination switching tube of the first capacitor, described
The first end of the output termination 3rd resistor of switching tube, the first of the second end of the 3rd resistor, the 4th resistance
The cathode at end, the first end of second capacitor and the diode connects altogether and connect with the control module, and the described 4th
The second end of resistance and the second end of second capacitor and the plus earth of the diode.
6. current protecting circuit as claimed in claim 5, which is characterized in that the switching tube is NPN type triode or positive-negative-positive
Triode,
Collector, emitter and the base stage of the NPN type triode be respectively the switching tube input, output end and
Controlled end；
Emitter, collector and the base stage of the PNP type triode be respectively the switching tube input, output end and
Controlled end.
7. current protecting circuit as described in claim 1, which is characterized in that the drive with control terminal can be used in the control module
Dynamic chip, single-chip microcontroller, programmable logic controller (PLC) or motion controller are realized.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822138523.9U CN209329672U (en) | 2018-12-18 | 2018-12-18 | Current protection circuit for high-voltage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822138523.9U CN209329672U (en) | 2018-12-18 | 2018-12-18 | Current protection circuit for high-voltage system |
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| Publication Number | Publication Date |
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| CN209329672U true CN209329672U (en) | 2019-08-30 |
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ID=67727720
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| CN201822138523.9U Active CN209329672U (en) | 2018-12-18 | 2018-12-18 | Current protection circuit for high-voltage system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768524A (en) * | 2018-12-18 | 2019-05-17 | 深圳市优必选科技有限公司 | Current protection circuit and current protection method for high-voltage system |
| CN112363560A (en) * | 2020-10-20 | 2021-02-12 | 国网江西省电力有限公司电力科学研究院 | Control and distribution method and device of photovoltaic power generation system |
| CN112600486A (en) * | 2020-12-03 | 2021-04-02 | 格力电器（武汉）有限公司 | Load power supply current protection circuit and method |
-
2018
- 2018-12-18 CN CN201822138523.9U patent/CN209329672U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768524A (en) * | 2018-12-18 | 2019-05-17 | 深圳市优必选科技有限公司 | Current protection circuit and current protection method for high-voltage system |
| CN112363560A (en) * | 2020-10-20 | 2021-02-12 | 国网江西省电力有限公司电力科学研究院 | Control and distribution method and device of photovoltaic power generation system |
| CN112600486A (en) * | 2020-12-03 | 2021-04-02 | 格力电器（武汉）有限公司 | Load power supply current protection circuit and method |
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Address after: 518000 16th and 22nd Floors, C1 Building, Nanshan Zhiyuan, 1001 Xueyuan Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen UBTECH Technology Co.,Ltd. Address before: 518000 16th and 22nd Floors, C1 Building, Nanshan Zhiyuan, 1001 Xueyuan Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen UBTECH Technology Co.,Ltd. |
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Effective date of registration: 20231205 Address after: Room 601, 6th Floor, Building 13, No. 3 Jinghai Fifth Road, Beijing Economic and Technological Development Zone (Tongzhou), Tongzhou District, Beijing, 100176 Patentee after: Beijing Youbixuan Intelligent Robot Co.,Ltd. Address before: 518000 16th and 22nd Floors, C1 Building, Nanshan Zhiyuan, 1001 Xueyuan Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen UBTECH Technology Co.,Ltd. |
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