CN101452017A - Full automatic over current protection test system and method - Google Patents
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Abstract
The invention provides a full automatic overflow protection testing system and a method, used for testing a overflow protection value of an interface to be tested. The full automatic overflow protection testing system comprises interfaces, programmable electronic loads, a control circuit and a control module. The interfaces are connected with the interfaces to be tested. The programmable electronic loads are coupled with the interfaces to form a loop, used as the circuit loads. The control circuit is coupled with the programmable electronic loads, for controlling the programmable electronic loads to change in the variation range of the loads, taking the maximal current value from all current values as the overcurrent protection current value. The display module is coupled to the control circuit, for displaying the overcurrent protection current value. The invention can automatically complete all tests and record all testing data.
Description
Technical field
The invention relates to a kind of measuring technology of interface, and particularly relevant for a kind of test macro and method of overcurrent protection of interface.
Background technology
When circuit was short-circuited, one of key character was that the electric current in the circuit sharply increases, when electric current flows through a certain predetermined value, react on that electric current raises and the protective device of action overcurrent protection.In much as interface standards such as PS2 interface, USB interface, all stipulated overcurrent protection need be provided now.USB (universal serial bus) (Universal Serial Bus, USB) be the peripheral equipment interface of a new generation, it is by Intel, Compaq, NEC, DEC, IBM, Northern Telecom, the common present data transmission standard of formulating that has been widely used of Microsoft seven tame software and hardware institutes of manufacturer.Just stipulated the overcurrent protection information that USB interface need provide in current USB standard, the USB interface or the product that do not meet this overcurrent protection regulation can not be by the authentications of USB ANSI.Present stage is measured the USB overcurrent protection, all by the electronic load manual test, operates cumbersomely, and there is personal error in the manual testing.
Please refer to Fig. 1, the patent No. is that the TaiWan, China patent of TW-I224197 proposes a kind of Auto-Test System, and this Auto-Test System comprises: sampling conversion device 101 and microprocessor 106.Sampling conversion device 101 converts a plurality of digital signals in order to a plurality of electrical parameters of capturing device to be measured and with above-mentioned electrical parameter.Microprocessor 106 is in order to receive above-mentioned digital signal to finish a plurality of different short-circuit protections tests, the test of a plurality of different overcurrent protection and the test of a plurality of different overvoltage protection respectively.
Above-mentioned system is owing to adopt microprocessor reception sampled signal to control, and its equipment is huge, and expense is expensive, has increased the expense of test.And adopt present employed measurement USB overcurrent protection, and manually to test by the resistance appendix, troublesome poeration has reduced testing efficiency.And the manual testing can produce personal error, has reduced the precision of test.
Summary of the invention
One of purpose of the present invention is providing a kind of full automatic over current protection test system, and the testing efficiency that needs manual test to cause with the solution prior art is low, the problem of low precision.
Another object of the present invention is providing a kind of full automatic over current protection method of testing, and the testing efficiency that needs manual test to cause with the solution prior art is low, the problem of low precision.
The present invention proposes a kind of full automatic over current protection test system, is used to test an overcurrent protection value of an interface to be measured, and this full automatic over current protection test system comprises: interface, programmable electronic load, control circuit and display module.Interface is used for connecting this interface to be measured.The programmable electronic load coupled forms a loop to interface, is used for the load as the loop.Control circuit is coupled to the programmable electronic load, loads on when changing in its load value constant interval in order to the control programmable electronic, and to get maximum current value be the overcurrent protection current value to all current values from the loop.Display module is coupled to control circuit, is used to show above-mentioned overcurrent protection current value.
According to the described a kind of full automatic over current protection test system of embodiments of the invention, wherein, control circuit comprises current testing circuit, and it comprises: flow measurement resistance, comparison amplifier and first analog/digital converter.Flow measurement resistance is arranged between gate-controlled switch and the programmable electronic load, and it flows through measuring current when the conducting of loop.Comparison amplifier has first input end, second input end and output terminal, first input end/second input end is coupled to flow measurement resistance, is used for when the conducting of loop, by comparing the voltage at flow measurement resistance two ends, obtain test voltage, this test voltage is a simulation test voltage.First analog/digital converter is coupled to the output terminal of comparison amplifier, is used for the simulation test voltage transitions is become digital test voltage.Control circuit more comprises one-chip computer module, be coupled to first analog/digital converter and programmable electronic load, be used for calculating the digital test electric current, and write down these digital test electric currents, and control programmable electronic load increases or reduces according to the digital test voltmeter.
According to the described a kind of full automatic over current protection test system of embodiments of the invention; wherein control circuit also comprises gate-controlled switch; be arranged between interface and the programmable electronic load; and its control end is coupled to one-chip computer module, is used for according to the disconnection of the control signal control loop of one-chip computer module and the duty of conducting.
According to the described a kind of full automatic over current protection test system of embodiments of the invention, control circuit also comprises second analog/digital converter, is coupled to interface, is used for converting the aanalogvoltage of interface to digital voltage.
According to the described a kind of full automatic over current protection test system of embodiments of the invention, above-mentioned interface is USB interface or PS2 interface.USB interface is the compatible USB interface with 4pin USB interface and 9pin USB interface.
The present invention proposes a kind of full automatic over current protection method of testing in addition, is used to test an overcurrent protection value of an interface, and one of its step forms a loop for an interface and a programmable electronic load that will be coupled to this interface to be measured.Its another step changes for this programmable electronic of control loads in its load value constant interval.It comprises that also step detects the some current values in this loop in the load value change procedure of this programmable electronic load, and gets maximum current value from some current values, and shows the current value that this is maximum.
Therefore the present invention can finish whole tests automatically and write down all test datas because of adopting full automatic over current protection test system and method.Since be all test datas of electronic surveying, true and reliable, to avoid personal error, and then save manpower greatly, test simultaneously is full-automatic, has improved testing efficiency greatly.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 illustrates the structural representation into existing self processor.
Fig. 2 illustrates the structural representation into a kind of full automatic over current protection test system of the embodiment of the invention.
Fig. 3 illustrates and is the concrete structural representation of a kind of full automatic over current protection test system of the embodiment of the invention.
Fig. 4 illustrates the process flow diagram into a kind of full automatic over current protection method of testing of the embodiment of the invention.
Embodiment
One of feature of the present invention is to couple an one-chip computer module and programmable electronic load on interface, by one-chip computer module control and calculating overcurrent value, avoided artificial test errors, has improved the efficient and the precision of test.
With reference to Fig. 2, it is the structural representation of a kind of full automatic over current protection test system of the embodiment of the invention.It is used to test the overcurrent protection value of interface to be measured, and this full automatic over current protection test system 200 comprises: interface 201, programmable electronic load 203, control circuit 209 and display module 211.Interface 201 is used to connect interface to be measured.Programmable electronic load 203 is coupled to interface 201, forms a loop, is used for the load as the loop.Control circuit 209 is coupled to programmable electronic load 203, and when changing in its load value constant interval in order to control programmable electronic load 203, to get maximum current value be the overcurrent protection current value to all current values from the loop.Display module 211 is coupled to control circuit 209, is used to show the overcurrent protection current value.
See also 3, it is the structural representation of a kind of full automatic over current protection test system of the embodiment of the invention.It comprises: interface 201, programmable electronic load 203, control circuit 209 and display module 211.And control circuit 209 comprises: gate-controlled switch 301, current testing circuit 303, second analog/digital converter 311 and one-chip computer module 313.Interface 201 is used to connect interface to be measured, and it can be USB interface.When it was USB interface, this USB interface designed with double nip, the inner USB interface of compatible common 4pin USB interface and 9pin.An one delivery outlet is exported a fixed voltage value, generally adopts 5V voltage.Programmable electronic load 203 is coupled to interface 201, forms a loop, is used for the load as the loop.Programmable electronic load 203 and interface 201 all need ground wire, make programmable electronic load 203 and interface 201 form a loop.Gate-controlled switch 301 is arranged between interface 201 and the programmable electronic load 203, is used for the duty of the disconnection and the conducting of control loop.When gate-controlled switch 301 is opened, can record open-circuit voltage values, when gate-controlled switch 301 closures, can record the excess current value by the size that changes programmable electronic load 203.Current testing circuit 303 comprises flow measurement resistance 305, comparison amplifier 307 and first analog/digital converter 309.Flow measurement resistance 305 is arranged between gate-controlled switch 301 and the programmable electronic load 203, and its resistance value is certain, and when gate-controlled switch 301 closures, it flows through measuring current.Comparison amplifier 307 has first input end, second input end and output terminal, first input end is coupled to gate-controlled switch 301, second input end is coupled to programmable electronic load 203, be used for when gate-controlled switch 301 closures, by comparing the voltage at flow measurement resistance two ends, obtain test voltage, this test voltage is a simulation test voltage.First analog/digital converter 309 is coupled to the output terminal of comparison amplifier 307, is used for the simulation test voltage transitions is become a digital test voltage, and for example it can adopt the method for quantification, obtains digital test voltage after simulation test voltage is quantized.Second analog/digital converter 311 is coupled to interface 201, is used for converting the aanalogvoltage of interface 201 to a digital voltage, and for example it can adopt the method for quantification, aanalogvoltage is quantized the back form digital voltage.One-chip computer module 313 mainly is to be used for processing digital signal, and therefore, above-mentioned measured aanalogvoltage is handled by one-chip computer module after must converting digital signal to by analog/digital converter.It has first input end, second input end, first output terminal, second output terminal and the 3rd output terminal, first input end is coupled to second analog/digital converter 311, second input end is coupled to first analog/digital converter 309, first output terminal is coupled to gate-controlled switch 301, second output terminal is coupled to programmable electronic load 203, be used for it and draw digital voltage by second analog/digital converter 311, digital test voltmeter according to first analog/digital converter 309 is calculated the digital test electric current, and write down these digital voltages, the digital test electric current, and the open and close of control gate-controlled switch 301 and control programmable electronic load 203 increase or reduce.It should be noted that especially, one-chip computer module 313 comprises single-chip microcomputer and control circuit thereof, and described single-chip microcomputer is realized by the software programming, programmed by software, the magnitude of voltage of input can be calculated to be current value, and the increase of may command programmable electronic load 203 or reduce.Display module 211 is coupled to second output terminal of one-chip computer module 313, is used to show above-mentioned digital current, digital test electric current and open-circuit voltage.
When full automatic over current protection test system of the present invention puts into effect, at first disconnect gate-controlled switch by control circuit, measure the open-circuit voltage values V0 of programmable electronic load.Subsequently again by the closed gate-controlled switch of control circuit, and adjust the size of programmable electronic load, making the ohmically current value of flow measurement is reservation value 500mA, measures the magnitude of voltage V1 of this moment simultaneously.Then, the resistance of programmable electronic load thus the time reduces gradually, equals at 0 o'clock until magnitude of voltage, and one-chip computer module is by calculating and current value when having write down each resistance value.At last, relatively these current values are got maximal value wherein, and this value is overcurrent protection current value I p.
By the narration of said apparatus, can get the full automatic over current protection method of testing, be used for the overcurrent protection value of test interface, this full automatic over current protection method of testing comprises (with reference to Fig. 4):
S410: the interface and the programmable electronic load that will be coupled to interface to be measured form the loop.
S420: the control programmable electronic loads in its load value constant interval and changes.
S430: the some current values in the load value change procedure of detection programmable electronic load in the loop, and from some current values, get maximum current value.
S440: when the loop is in off-state, the open-circuit voltage values of monitoring circuit.
S450: when the loop is in conducting state, regulate the programmable electronic load, making current in loop is a predetermined value, the test voltage value of monitoring circuit.
S460: show this maximum current value, open-circuit voltage values and test voltage value.
When adopting method of the present invention to test, at first disconnect gate-controlled switch by control circuit, measure the open-circuit voltage values V0 of programmable electronic load.Subsequently again by the closed gate-controlled switch of control circuit, and adjust the size of programmable electronic load, making the ohmically current value of flow measurement is 500mA, measures the magnitude of voltage V1 of this moment simultaneously.Then, the resistance of programmable electronic load thus the time reduces gradually, equals at 0 o'clock until magnitude of voltage, and one-chip computer module is by calculating and current value when having write down each resistance value.At last, relatively these current values are got maximal value wherein, and this value is overcurrent protection current value I p.
Need to prove, said apparatus and method not only can be surveyed the excess current value of USB interface, can also survey the excess current value of other interfaces such as PS2 interface, and its used apparatus and method are identical with said apparatus and method, only the inner formula of single-chip microcomputer has difference, repeats no more herein.
In sum, full automatic over current protection test system of the present invention and method have the following advantages:
Magnitude of voltage and overcurrent protection current value when 1) full automatic over current protection test system of the present invention and method can be with the open-circuit voltage values of the same test interface of manual test, 500mA loads, and can finish whole tests automatically and write down all test datas.
The personal error that forms when 2) full automatic over current protection test system of the present invention and method can be avoided manual test has increased the precision of testing.
3) because full automatic over current protection test system of the present invention and method are full-automatic testings, avoid adopting great amount of manpower, improved the efficient of test.
Though the present invention discloses as above with embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (11)
1. full automatic over current protection test system, an overcurrent protection value that is used to test an interface to be measured, this full automatic over current protection test system comprises:
One interface is used for connecting this interface to be measured;
One programmable electronic load is coupled to this interface, forms a loop, is used for the load as this loop;
One control circuit is coupled to this programmable electronic load, loads on when changing in its load value constant interval in order to control this programmable electronic, and to get a maximum current value be an overcurrent protection current value to all current values from this loop; And
One display module is coupled to this control circuit, is used to show this overcurrent protection current value.
2. full automatic over current protection test system as claimed in claim 1 is characterized in that this control circuit comprises a current testing circuit, and it comprises:
One flow measurement resistance is arranged between this interface and this programmable electronic load, and it flows through a measuring current when the conducting of this loop;
One comparison amplifier has first input end, second input end and output terminal, and first input end/second input end is coupled to this flow measurement resistance, be used for when the conducting of this loop, by the voltage at these flow measurement resistance two ends relatively, obtain a test voltage, this test voltage is a simulation test voltage; And
One first analog/digital converter, the one end is coupled to the output terminal of this comparison amplifier, is used for this simulation test voltage transitions is become a digital test voltage,
Wherein, this control circuit more comprises an one-chip computer module, be coupled to this first analog/digital converter and this programmable electronic load, be used for calculating a digital test electric current according to this digital test voltmeter, and write down those digital test electric currents, and control this programmable electronic load and increase or reduce.
3. full automatic over current protection test system as claimed in claim 2; it is characterized in that; this control circuit also comprises a gate-controlled switch; be arranged between this interface and this programmable electronic load; and its control end is coupled to this one-chip computer module, is used for controlling according to a control signal of this one-chip computer module the duty of the disconnection and the conducting in this loop.
4. full automatic over current protection test system as claimed in claim 3 is characterized in that, this control circuit also comprises one second analog/digital converter, is coupled to this interface, is used for converting the aanalogvoltage of this interface to a digital voltage.
5. full automatic over current protection test system as claimed in claim 1 is characterized in that, this interface is USB interface or PS2 interface.
6. full automatic over current protection test system as claimed in claim 5 is characterized in that, this USB interface is the compatible USB interface with 4 stitch USB interface and 9 stitch USB interface.
7. full automatic over current protection test system as claimed in claim 1 is characterized in that, the constant interval of the load value of this programmable electronic load is for being the load value that load value to the digital voltage value of 500mA goes to zero from current value in the programmable electronic load.
8. full automatic over current protection method of testing, an overcurrent protection value that is used to test an interface to be measured comprises:
The interface and the programmable electronic load that are coupled to this interface to be measured are formed a loop;
Control this programmable electronic and load on variation in its load value constant interval;
Detect the some current values in this loop in the load value change procedure of this programmable electronic load, and from some current values, get maximum current value; And
Show the current value that this is maximum.
9. full automatic over current protection method of testing as claimed in claim 8 is characterized in that, this method also comprises: when this loop is in off-state, measure an open-circuit voltage values in this loop.
10. full automatic over current protection method of testing as claimed in claim 8; it is characterized in that this method also comprises: when this loop is in conducting state, regulate this programmable electronic load; making this current in loop is a predetermined value, monitors a test voltage value in this loop.
11. full automatic over current protection method of testing as claimed in claim 10 is characterized in that, the constant interval of the load value of this programmable electronic load is for being the load value that the load value of 500mA goes to zero to its magnitude of voltage from current value in the programmable electronic load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101970043A CN101452017B (en) | 2007-11-30 | 2007-11-30 | Full automatic over current protection test system and method |
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| CN2007101970043A CN101452017B (en) | 2007-11-30 | 2007-11-30 | Full automatic over current protection test system and method |
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| CN101452017A true CN101452017A (en) | 2009-06-10 |
| CN101452017B CN101452017B (en) | 2011-10-26 |
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| CN102136909A (en) * | 2010-01-25 | 2011-07-27 | 索尼公司 | Equipment authentication system and power supply control method |
| CN102207899A (en) * | 2010-03-31 | 2011-10-05 | 英业达股份有限公司 | Device for testing universal serial bus port |
| CN102870307A (en) * | 2010-04-26 | 2013-01-09 | 西门子公司 | Power supply module |
| CN103278673A (en) * | 2013-05-08 | 2013-09-04 | 东莞市百维科技有限公司 | System and method for testing overcurrent value of power protection plate |
| CN103529284A (en) * | 2012-07-06 | 2014-01-22 | 核工业西南物理研究院 | Over-current detector based on CPLD and provided with master-slave multi-computer communication function |
| CN108508379A (en) * | 2018-06-07 | 2018-09-07 | 艾乐德电子（南京）有限公司 | A kind of program control type electronic load device that can generate voltage output and test method |
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| CN109212432A (en) * | 2018-08-21 | 2019-01-15 | 郑州云海信息技术有限公司 | A kind of method and system using the automatic accurate test OCP of programmable E-Load |
| CN109828169A (en) * | 2019-02-01 | 2019-05-31 | 中国矿业大学(北京) | Electric fireproof current-limiting protector electric performance test method, apparatus and system |
| CN109959818A (en) * | 2017-12-25 | 2019-07-02 | 中国电信股份有限公司 | Current test method, controller and device |
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| US6624994B1 (en) * | 2001-11-09 | 2003-09-23 | National Semiconductor Corporation | Apparatus and method for over-current protection of an analog switch |
| CN2810071Y (en) * | 2005-07-26 | 2006-08-23 | 顾重威 | Intelligent tester for overcurrent of protector |
| CN200953123Y (en) * | 2006-09-27 | 2007-09-26 | 揭雪强 | USB interface protection circuit |
| CN100486069C (en) * | 2006-12-26 | 2009-05-06 | 华为技术有限公司 | Method and system for detecting DC over current protector |
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2007
- 2007-11-30 CN CN2007101970043A patent/CN101452017B/en not_active Expired - Fee Related
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| CN102136909A (en) * | 2010-01-25 | 2011-07-27 | 索尼公司 | Equipment authentication system and power supply control method |
| CN102207899A (en) * | 2010-03-31 | 2011-10-05 | 英业达股份有限公司 | Device for testing universal serial bus port |
| CN102207899B (en) * | 2010-03-31 | 2014-06-04 | 英业达股份有限公司 | Device for testing universal serial bus port |
| CN102870307A (en) * | 2010-04-26 | 2013-01-09 | 西门子公司 | Power supply module |
| CN103529284A (en) * | 2012-07-06 | 2014-01-22 | 核工业西南物理研究院 | Over-current detector based on CPLD and provided with master-slave multi-computer communication function |
| CN103529284B (en) * | 2012-07-06 | 2016-07-13 | 核工业西南物理研究院 | A kind of over-current detector possessing Subordinate communication function based on CPLD |
| CN103278673A (en) * | 2013-05-08 | 2013-09-04 | 东莞市百维科技有限公司 | System and method for testing overcurrent value of power protection plate |
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| CN109959818A (en) * | 2017-12-25 | 2019-07-02 | 中国电信股份有限公司 | Current test method, controller and device |
| CN108601135A (en) * | 2018-03-02 | 2018-09-28 | 长沙凯上电子科技有限公司 | A kind of intelligent power control circuit and its control method |
| CN108508379A (en) * | 2018-06-07 | 2018-09-07 | 艾乐德电子（南京）有限公司 | A kind of program control type electronic load device that can generate voltage output and test method |
| CN109212432A (en) * | 2018-08-21 | 2019-01-15 | 郑州云海信息技术有限公司 | A kind of method and system using the automatic accurate test OCP of programmable E-Load |
| CN109828169A (en) * | 2019-02-01 | 2019-05-31 | 中国矿业大学(北京) | Electric fireproof current-limiting protector electric performance test method, apparatus and system |
| CN111273208A (en) * | 2020-03-11 | 2020-06-12 | 深圳市金锐显数码科技有限公司 | Precision automatic correction method and system based on electronic load |
| CN111273208B (en) * | 2020-03-11 | 2022-05-10 | 深圳市金锐显数码科技有限公司 | Precision automatic correction method and system based on electronic load |
| CN111366776A (en) * | 2020-04-02 | 2020-07-03 | 常州瑞创电器科技有限公司 | Over-current detection method of solar air conditioner controller |
| CN113777520A (en) * | 2021-09-16 | 2021-12-10 | 浪潮商用机器有限公司 | Test method, device, system and medium for board-mounted power supply overcurrent protection |
| CN114019267A (en) * | 2021-09-30 | 2022-02-08 | 苏州浪潮智能科技有限公司 | Overcurrent protection test method, device, equipment and readable storage medium |
| CN114019267B (en) * | 2021-09-30 | 2024-01-19 | 苏州浪潮智能科技有限公司 | Overcurrent protection test method, device, equipment and readable storage medium |
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| Publication number | Publication date |
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| CN101452017B (en) | 2011-10-26 |
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