CN201904769U - Quick switching device for sampling circuit gears - Google Patents
Quick switching device for sampling circuit gears Download PDFInfo
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- CN201904769U CN201904769U CN2010205160659U CN201020516065U CN201904769U CN 201904769 U CN201904769 U CN 201904769U CN 2010205160659 U CN2010205160659 U CN 2010205160659U CN 201020516065 U CN201020516065 U CN 201020516065U CN 201904769 U CN201904769 U CN 201904769U
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Abstract
The utility model relates to a quick switching device for sampling circuit gears, the core of which is to separate a loading switching from a sampling signal switching, so as to reduce the influence of a loading switcher on a sampling signal. The technical scheme is that the quick switching device for the sampling circuit gears comprises a signal sampling module, a loading switching module, a sampling-signal switching module, a sampling-signal processing module and a gear switching control module, wherein the signal sampling module is used for sampling signals; the loading switching module is used for switching the connection between the sampling module and the loading; the sampling-signal switching module is connected to the sampling signals and the sampling-signal processing module; the sampling-signal processing module is used for processing and judging the sampled signals; the gears switching control module is used for controlling the switching operation between the loading switching module and the sampling-signal switching module; and the loading switching module is separated from the sampling-signal switching module. The quick switching device for sampling circuit gears has the beneficial effects that the problems of the measurement error caused by inner resistance of the switch and the gear switching speed influenced by the executing speed of the switch are solved.
Description
Technical field
The utility model relates to a kind of apparatus for fast switching of sample circuit gear, its core is the load switching to be switched with sampled signal separate, reduce the influence that the load switching device brings sampled signal thus, and then improve a kind of sample circuit gear switching device of sample circuit gear switch speed and precision.
Background technology
In signal processing and fields of measurement, usually need signal is sampled, and further sampled signal is handled, so that by measurement to sampled signal, calculate the running parameter of measurand, for example: we need test the current drain of some circuit, the scheme of being taked is exactly sample resistance of series connection in circuit loop, by measuring the voltage at sample resistance two ends, calculate the electric current of circuit-under-test then by Ohm's law, this resistance sample resistance of just being known as.The content of Ohm's law is:
Electric current=voltage/resistance
The resistance two ends of series connection can produce pressure drop, so the resistance value of the resistance of series connection must be selected meticulously, excessive sample resistance can cause pressure drop too big, influence the operating state of circuit-under-test, too small sample resistance can cause sampled signal too small, influences measuring accuracy.
So, when the needs wide region is measured, generally all be that measuring range is divided into several grades, different then gears adopts different sample resistances, in measuring process, obtains best measurement result by switching suitable sample resistance.Fig. 1 and Fig. 2 have described traditional high-side current sampling gear switch circuit: wherein, Fig. 1 is the conventional current sampling gear switch circuit that sampling resistor is connected in parallel, and Fig. 2 is the conventional current sampling gear switch circuit of sampling resistor series connection.
At Fig. 1 and 2, in, S1, S2 are the gear switch switch, and Rses1 and Rses2 are sample resistance, and RL is a load resistance, by the switching of S1, S2, selects suitable gear during work, promptly selects suitable sample resistance, realizes the purpose of gear switch.
Sort circuit has characteristics, promptly the performer S1/S2 of Qie Huaning is connected in the load circuit, undertakes the switching of sampled signal and load simultaneously, because also there is contact resistance in performer, under the occasion of accurate measurement or Super-Current Measurement, S1/S2 is bigger to result's influence of measuring.
In order to address this problem, usually adopt the little device of contact impedance, for example relay is used as the gear switch device, but because pull up time is very slow, general relay adhesive or release time are several to several milliseconds at zero point, such switch speed is unacceptable in the field that Modern High-Speed is measured
Because components and parts development of technology, field-effect transistor, be that MOSFET can accomplish very low conducting resistance, the ME2303 type field effect transistor that can buy of market for example, when VGS=4.5V, RDS can be low to moderate 85 milliohms, because the switch speed of field-effect transistor is exceedingly fast, so might field-effect transistors replace S1/S2 fully, reach the purpose that gear switches fast.Fig. 3 and Fig. 4 are the diagram of this solution; Wherein, Fig. 3 be sample resistance be connected in parallel with MOSFET as the current sample gear switch circuit of gear switch switching device; Fig. 4 be sample resistance be connected in series with MOSFET as the current sample gear switch circuit of gear switch switching device.
In modern high-acruracy survey is used, require high measuring accuracy and stable testing, above-mentioned scheme still can not meet the demands, because following reason:
1, the conducting internal resistance of field-effect transistor still has tens of milliohms, and this is not allowed in accurate measurement is used;
2, the conducting internal resistance of field-effect transistor has discreteness, the device of same model, same batch of production, and its conducting internal resistance is all different, and this has increased the device error for measuring to use;
3, the conducting internal resistance of field-effect transistor is along with the variation by electric current, voltage changes, and this will bring tangible measure error.
In view of the foregoing, the utility model people has designed following technical proposals.
The utility model content
The technical problems to be solved in the utility model is the defective that influences gear switch speed for the execution speed that overcomes measure error that the internal resistance of above-mentioned prior art switching device brings and switching device, and the apparatus for fast switching of a kind of high accuracy and high-speed sample circuit gear is provided.
For solving the problems of the technologies described above, adopt following technical scheme:
Sample circuit gear apparatus for fast switching comprises signal sampling module, load handover module, sampled signal handover module, sampled signal processing module and gear switch control module; Described signal sampling module acquired signal, connection between described load handover module switch sampling module and the load, described sampled signal handover module connects sampled signal and sampled signal processing module, described sampled signal processing module is handled the signal that samples and is judged, the change action of described gear switch control module control load handover module and sampled signal handover module, described load handover module separates with the sampled signal handover module.
Described load handover module does not have with its sampled signal treatment loop and is connected; Described signal sampling inside modules has a plurality of sampling elements; There are a plurality of signal switching devices described sampled signal handover module inside; There are a plurality of load switching devices described load handover module inside; Described gear switch control signal inside modules has a plurality of control signals.
In the described gear switch control signal module, the switch executing element of its gear switch is field-effect transistor or active device with approximate characteristic.
The control signal parallel connection of described load switching and sampled signal handover module.
Its signal sampling module has high input impedance.
Its operation principle is: a plurality of sampling devices, for example, sample resistance; One group of load commutation circuit is used for the connection between switch sampling device and the load; One group of sampled signal commutation circuit is used for the connection between the switch sampling Signal and Signal Treatment unit; By separating of load commutation circuit and sampled signal commutation circuit, eliminate sampled signal by the extra loss of signal that switching device produced
Wherein, the signal sampling module is responsible for signal is taken a sample.
The load handover module is responsible for the connection between switching signal sampling module and the load.
The switching signal of being responsible for the sampled signal handover module adopts the connection between module and the sampled signal processing module.
The gear switch control element is used for control load handover module and sampled signal handover module.
The signal sampling module is responsible for signal is gathered, and in order to reach the acquisition range of broad, this inside modules has several sampling elements, the corresponding suitable measuring range of each sampling element.
When circuit working, the groundwork electric current by the load handover module, flows to load then by sampling module.
At electric current when the signal sampling module, can one of sampling element or sampling element two on, produce pressure drop, this group voltage is through the oversampled signals handover module, deliver to the sampled signal processing module, amplify and handle by the sampled signal processing module, so that obtain measurement result.
Because current signal directly by the signal sampling module, is coupled to the sampled signal processing module by the sampled signal handover module, so the internal resistance of load handover module can not have influence on sampled signal, also is that the load handover module does not influence certainty of measurement.
Because the control signal of sampled signal handover module and load handover module comes from gear switch control signal module, two of one of signal switching device and signal switching device is in parallel with two control signal of one of load switching device and load switching device, thus guaranteed that load switching and sampled signal switch synchronously.
Because the switching speed of signal switching device and load switching device is high, so this programme can be realized very high gear switch speed.
In sum, the beneficial effects of the utility model are: can effectively solve the switch speed of sampling commutation circuit and this contradiction of the loss of signal that switching device brings, can be widely used in multiple fields such as instrument and meter, the execution speed that preferably resolves measure error that the switching device internal resistance brings and switching device influences the problem of gear switch speed.
Description of drawings
Below in conjunction with the drawings and the specific embodiments, the utility model is described in further detail.
Fig. 1 is the conventional current sampling gear switch circuit that sampling resistor is connected in parallel;
Fig. 2 is the conventional current sampling gear switch circuit of sampling resistor series connection;
Fig. 3 be sample resistance be connected in parallel with MOSFET as the current sample gear switch circuit of gear switch switching device;
Fig. 4 be sample resistance be connected in series with MOSFET as the current sample gear switch circuit of gear switch switching device;
The annexation figure of Fig. 5 the utility model embodiment;
The circuit diagram of Fig. 6 the utility model embodiment.
Accompanying drawing sign: one of signal sampling module 1, sampling element 11, sampling element 2 12, one of sampled signal handover module 2, signal switching device 21, signal switching device 2 22, one of load handover module 3, load switching device 31, load switching device 2 32, one of sampled signal processing module 4, load 5, gear switch control signal module 6, control signal 61, control signal 2 62.
Embodiment
As shown in Figure 5, signal sampling module 1 is responsible for signal is gathered, and in order to reach the acquisition range of broad, this inside modules has several sampling elements, the corresponding suitable measuring range of each sampling element.
When circuit working, the groundwork electric current then by load handover module 3, flows to load 5 by sampling module 1.
At electric current when the signal sampling module 1, can one of sampling element 11 or sampling element 2 12 on, produce pressure drop, this group voltage is through oversampled signals handover module 2, deliver to sampled signal processing module 4, amplify and handle by sampled signal processing module 4, so that obtain measurement result.
Because current signal directly by signal sampling module 1, is coupled to sampled signal processing module 4 by sampled signal handover module 2, so the internal resistance of load handover module 3 can not have influence on sampled signal, also is that load handover module 3 does not influence certainty of measurement.
Because the control signal of sampled signal handover module 2 and load handover module 3 comes from gear switch control signal module 6,2 22 of one of signal switching device 21 and signal switching device is in parallel with 2 32 control signal of one of load switching device 31 and load switching device, thus guaranteed that load switching and sampled signal switch synchronously.
Because the switching speed of signal switching device and load switching device is high, so this programme can be realized very high gear switch speed.
The circuit diagram of Fig. 6 the utility model embodiment.In the drawings, 2R1,2R2,2R3,2R4 have constituted current signal sampling module 1, and electric current is flowed through and will be produced pressure drop behind the sample resistance.2Q3,2Q6,2Q9,2Q12 have constituted load handover module 3.2Q2,2Q5,2Q8,2Q11 have constituted signal handover module 2, and 2U1 and peripheral circuit thereof have constituted sampled signal processing module 4, and control signal derives from RANGE1, RANGE2, RANGE3, RANGE4.2LED1,2LED2,2LED3,2LED4 are the gear display circuit.During work, control signal control load handover module 3 and signal handover module 2 carry out gear and select, the flow direction of load current is for passing through sampling resistor, arriving load handover module 3, arrive load 5 again, load handover module 3 can produce pressure drop though load current is flowed through, but because load handover module 3 is not in signal conditioning circuit, so to test result not influence basically.The flow direction of signal for successively from sampling resistor, to signal handover module 2, again to the sampled signal processing module, convert voltage signal then to and deliver to measurement ADC, because the input impedance of sampled signal processing module 4 is very high, although signal handover module 2 has certain internal resistance, but the input impedance of ratioing signal processing module, still may diminish to and ignore, so signal can complete impregnable arriving signal processing module.Because the switch speed of MOSFET is very fast, solved switching device to slow shortcomings of device switch speed such as the loss of signal and relays.So this circuit has realized that the sample circuit gear switches fast.
This design is applied to the load current test of USB device at present in batches, and working stability is reliable, has proved that solution of the present utility model has actual using value.
In sum, the utility model can solve the problem that the slow or switching device of the speed of traditional sample circuit gear switch influence certainty of measurement, realizes high accuracy, high-speed gear switch, for high accuracy, at a high speed, the measurement of wide region provides the foundation.
Claims (3)
1. a sample circuit gear apparatus for fast switching comprises: signal sampling module, load handover module, sampled signal handover module, sampled signal processing module and gear switch control module; Described signal sampling module acquired signal, connection between described load handover module switch sampling module and the load, described sampled signal handover module connects sampled signal and sampled signal processing module, the change action of described gear switch control module control load handover module and sampled signal handover module is characterized in that: described load handover module separates with the sampled signal handover module.
2. sample circuit gear apparatus for fast switching according to claim 1 is characterized in that: described load handover module does not have with its sampled signal treatment loop and is connected; Described signal sampling inside modules has a plurality of sampling elements; There are a plurality of signal switching devices described sampled signal handover module inside; There are a plurality of load switching devices described load handover module inside.
3. sample circuit gear apparatus for fast switching according to claim 1 and 2 is characterized in that: in the described gear switch control signal module, the switch executing element of its gear switch is field-effect transistor or active device with approximate characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205160659U CN201904769U (en) | 2010-09-01 | 2010-09-01 | Quick switching device for sampling circuit gears |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205160659U CN201904769U (en) | 2010-09-01 | 2010-09-01 | Quick switching device for sampling circuit gears |
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| CN201904769U true CN201904769U (en) | 2011-07-20 |
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| CN2010205160659U Expired - Fee Related CN201904769U (en) | 2010-09-01 | 2010-09-01 | Quick switching device for sampling circuit gears |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308079A (en) * | 2012-03-12 | 2013-09-18 | 博西华电器（江苏）有限公司 | Household electrical appliance and gear detection device thereof as well as stove and smoke exhaust ventilator assembly |
| CN104569700A (en) * | 2015-02-03 | 2015-04-29 | 上海观源信息科技有限公司 | Equipment power consumption acquiring device with various interfaces |
| CN105450203A (en) * | 2015-11-13 | 2016-03-30 | 得理电子(上海)有限公司 | Interference filtering device and interference filtering method for rapid on-off mechanical switches |
| CN105891704A (en) * | 2014-05-05 | 2016-08-24 | 惠州市德赛西威汽车电子股份有限公司 | Gear detection circuit of heavy-current switch |
| WO2017133395A1 (en) * | 2016-02-05 | 2017-08-10 | 广东欧珀移动通信有限公司 | Terminal charging system, charging method, and power adapter |
| CN107912076A (en) * | 2016-02-05 | 2018-04-13 | 广东欧珀移动通信有限公司 | For the charging system of terminal, charging method and power supply adaptor |
| CN110261704A (en) * | 2019-07-11 | 2019-09-20 | 上海移远通信技术股份有限公司 | The current detecting system and method for communication module |
| CN112904206A (en) * | 2019-12-03 | 2021-06-04 | 成都秦川物联网科技股份有限公司 | Gas meter lithium battery electricity consumption detection system and method |
-
2010
- 2010-09-01 CN CN2010205160659U patent/CN201904769U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308079A (en) * | 2012-03-12 | 2013-09-18 | 博西华电器（江苏）有限公司 | Household electrical appliance and gear detection device thereof as well as stove and smoke exhaust ventilator assembly |
| CN105891704A (en) * | 2014-05-05 | 2016-08-24 | 惠州市德赛西威汽车电子股份有限公司 | Gear detection circuit of heavy-current switch |
| CN104569700A (en) * | 2015-02-03 | 2015-04-29 | 上海观源信息科技有限公司 | Equipment power consumption acquiring device with various interfaces |
| CN105450203A (en) * | 2015-11-13 | 2016-03-30 | 得理电子(上海)有限公司 | Interference filtering device and interference filtering method for rapid on-off mechanical switches |
| CN105450203B (en) * | 2015-11-13 | 2018-06-01 | 得理电子(上海)有限公司 | A kind of interference filter device and method for quick on-off mechanical switch |
| CN107912076A (en) * | 2016-02-05 | 2018-04-13 | 广东欧珀移动通信有限公司 | For the charging system of terminal, charging method and power supply adaptor |
| WO2017133396A1 (en) * | 2016-02-05 | 2017-08-10 | 广东欧珀移动通信有限公司 | Terminal charging system, charging method, and power adapter |
| WO2017133395A1 (en) * | 2016-02-05 | 2017-08-10 | 广东欧珀移动通信有限公司 | Terminal charging system, charging method, and power adapter |
| EP3285361A4 (en) * | 2016-02-05 | 2018-06-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Terminal charging system, charging method, and power adapter |
| CN109155528A (en) * | 2016-02-05 | 2019-01-04 | Oppo广东移动通信有限公司 | For the charging system of terminal, charging method and power supply adaptor |
| US10320225B2 (en) | 2016-02-05 | 2019-06-11 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system and charging method for increasing service life of battery of terminal and power adapter thereof |
| CN109155528B (en) * | 2016-02-05 | 2022-06-07 | Oppo广东移动通信有限公司 | Charging system and charging method for terminal and power adapter |
| CN110261704A (en) * | 2019-07-11 | 2019-09-20 | 上海移远通信技术股份有限公司 | The current detecting system and method for communication module |
| CN110261704B (en) * | 2019-07-11 | 2021-07-16 | 上海移远通信技术股份有限公司 | Current test system and method of communication module |
| CN112904206A (en) * | 2019-12-03 | 2021-06-04 | 成都秦川物联网科技股份有限公司 | Gas meter lithium battery electricity consumption detection system and method |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20130901 |