CN205015773U - Big dynamic current collection system of high accuracy and constant voltage constant current supply system thereof - Google Patents
Big dynamic current collection system of high accuracy and constant voltage constant current supply system thereof Download PDFInfo
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- CN205015773U CN205015773U CN201520647700.XU CN201520647700U CN205015773U CN 205015773 U CN205015773 U CN 205015773U CN 201520647700 U CN201520647700 U CN 201520647700U CN 205015773 U CN205015773 U CN 205015773U
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Abstract
The utility model discloses a big dynamic current collection system of high accuracy and constant voltage constant current supply system thereof, its current collection device includes microcontroller, the resistance gating network, voltage amplifier, AD converter and input output device, realize the electric current through the controlling resistance gating network and gather the automatic switch -over of range, still be provided with the feedback end on the resistance gating network, increase DC power supply on the big dynamic current collection system of high accuracy, form the constant voltage constant current supply system based on the big dynamic current collection system of high accuracy, constant voltage / constant current value that can be different according to load size automatically output. It is showing the effect: only change the sampling resistor, make the electric current collection fractional error of each range keep invariable, that uses the sampling resistor is partly as feedback resistance, and the feedback loop of formation voltage / electric current ensures systematic stability, can guarantee to realize that constant voltage constant current supply system can export different constant voltage / constant current values under the invariable prerequisite of output error.
Description
Technical field
The utility model relates to current acquisition technical field, specifically, is a kind of high precision Larger Dynamic current collecting device and constant voltage/constant current electric power system thereof.
Background technology
Current collecting device is widely used in the equipment such as current instruments and constant voltage/constant current source, and generally, the scope of foreign current is comparatively large, and the current signal scope like this through current collecting device is also larger; It is change current sampling resistor that the method for existing current collecting device change current acquisition range mainly contains two kinds: one, keeps the voltage gain of sampling resistor constant; Two, keep sampling resistor constant, regulate the voltage gain of sampling resistor.Method one is generally used in current instruments, because current collection circuit does not change, only changes sampling resistor, thus the current acquisition relative error of each range can be made to keep constant.But existing by changing the constant current collecting device of sampling resistor maintenance sampling resistor voltage gain, complex structure causes cost higher, and system does not have the complicated structure of feedback circuit or feedback circuit, causes system stability lower.Method two is used in constant voltage/constant current source usually, because load dynamic range is larger, the multirange that constant pressure source realizes constant pressure source by the voltage gain changing sampling resistor exports, the error of each magnitude of voltage that constant pressure source can be caused to export is inconsistent, cause the precision of voltage output value to reduce, constant current source is also like this.Therefore, separately through the current collecting device that any one method above-mentioned realizes, all cannot meet needs such as being simultaneously applied in current acquisition instrument and constant voltage/current isolator and use in the system of current collecting device.
Utility model content
In view of this, first the utility model provides a kind of high precision Larger Dynamic current collecting device, realizes current collecting device and is applied in current acquisition instrument and constant voltage/constant current source simultaneously, and can meet high-precision demand.
Concrete technical scheme is as follows:
A kind of high precision Larger Dynamic current collecting device, its key is:
Comprise microcontroller, resistance gating network, voltage amplifier, A/D converter and input-output apparatus; Described resistance gating network for access need gather electric current current return in, its resistance is adjustable, and this resistance gating network is provided with current input terminal I
in, current output terminal I
outand resistance regulation and control end Con; The input end of described voltage amplifier is connected to the current input terminal I of described resistance gating network
in, for gathering the current input terminal I of described resistance gating network
involtage signal and realize signal amplify; The output terminal of described voltage amplifier is connected with the input end of described A/D converter, the input end of microcontroller described in the output termination of described A/D converter, an output terminal of described microcontroller is connected on the resistance regulation and control end Con of described resistance gating network, for changing the resistance of described resistance gating network; Also connect described input-output apparatus on the microcontroller, for realizing data transmission and external control.
Wherein, described resistance gating network comprises the adjustable resistance module R2 of multiple resistance and multiple switch combination formation, is changed the resistance of resistance gating network access current return by the assembled state of the multiple switch of described microprocessor controls.
The utility model apply time, resistance gating network as the sampling resistor of current collecting device, the current input terminal I of resistance gating network
inwith current output terminal I
outbe connected in the current return needing to gather electric current, the size of the voltage signal that microcontroller comes according to voltage amplifier collection, to the resistance of resistance gating network regulation and control end Con transmit button switching signal, control the resistance in adjustable resistance module R2 access current return, make current collecting device can gather the current value of different range of current, realize the automatic switchover of the current acquisition range of current collecting device.
Further, at the two ends of described adjustable resistance module R2, also parallel join has bypass diode D1 and bypass diode D2, for realizing bidirectional flow-through protection, ensures that current collecting device is when gathering larger current value, can not be burned; Bypass diode D1 and bypass diode D2 adopts heavy-duty diode, and forward conduction electric current is not less than the collectable maximum current of current collecting device; Diode D1 or D2 can adopt the mode of single or multiple Diode series to realize, and realizes adjusting current measurement range among a small circle.
Again further, described resistance gating network is also provided with the feedback resistance R1 connected with described adjustable resistance module R2, wherein: one end of adjustable resistance module R2 is as the current input terminal I of resistance gating network
in, one end of feedback resistance R1 is as the current output terminal I of resistance gating network
out, the common port of feedback resistance R1 and adjustable resistance module R2 is as the feedback end Ref of resistance gating network, and the Switch Control end in adjustable resistance module R2 is as described resistance regulation and control end Con.Feedback resistance R1 makes current collecting device have current feedback loop, and feedback resistance R1 together with adjustable resistance module R2 as the sampling resistor of current collecting device, add the robustness of sampling resistor place current return.
In conjunction with above-mentioned high precision Larger Dynamic current collecting device, another object of the present utility model is to provide a kind of constant voltage/constant current electric power system based on high precision Larger Dynamic current collecting device, its key is: on the basis of above-mentioned high precision Larger Dynamic current collecting device, also be provided with direct supply and loading interfaces, the positive pole of described direct supply connects the high level output end of described loading interfaces, the current input terminal I of described resistance gating network
inconnect the low level output end of described loading interfaces, the current output terminal I of described resistance gating network
outconnect the negative pole of described direct supply, the feedback end Ref of described resistance gating network is also connected with the feedback end ref of described direct supply.
During use, the power interface of load is connected in the loading interfaces of above-mentioned electric power system, microcontroller judges the size of present load according to the voltage signal that voltage amplifier collection comes, and access the resistance in current return according to load required voltage/current value adjustment adjustable resistance module R2, realize the change of the output voltage/electric current of electric power system.Because load dynamic range is comparatively large, the Current Negative Three-Point Capacitance loop that constant-current supply system is formed by feedback resistance R1, guarantees that output current value keeps constant; Constant voltage electric power system, when there is overcurrent, equally by the voltage feedback loop that feedback resistance R1 is formed, guarantees that output voltage values keeps constant.
Beneficial effect: (1) only changes sampling resistor, makes the current acquisition relative error of each range keep constant; (2) use a part for sampling resistor as feedback resistance, the backfeed loop of coating-forming voltage/electric current, guarantees the stability of system; (3) can ensure, under the prerequisite that output error is constant, to realize constant voltage/constant current electric power system and can export different constant voltage/constant current values.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the circuit theory diagrams of voltage amplifier in Fig. 1;
Fig. 3 is the resistor coupled in parallel gated fashion of resistance gating network in Fig. 1;
Fig. 4 is the resistant series gated fashion of resistance gating network in Fig. 1;
Fig. 5 is the circuit theory diagrams of resistance gating network in Fig. 1;
Fig. 6 is the circuit theory diagrams based on constant pressure and flow electric power system of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail.
A kind of high precision Larger Dynamic current collecting device as shown in Figure 1, its key is:
Comprise microcontroller 1, resistance gating network 2, voltage amplifier 3, A/D converter 4 and input-output apparatus 5; Described resistance gating network 2 for access need gather electric current current return in, its resistance is adjustable, and this resistance gating network 2 is provided with current input terminal I
in, current output terminal I
outand resistance regulation and control end Con; The input end of described voltage amplifier 3 is connected to the current input terminal I of described resistance gating network 2
in, for gathering the current input terminal I of described resistance gating network 2
involtage signal and realize signal amplify, as shown in Figure 2, the voltage amplification factor of voltage amplifier 3 can be regulated by resistance R3 and R4; The output terminal of described voltage amplifier 3 is connected with the input end of described A/D converter 4, the input end of microcontroller 1 described in the output termination of described A/D converter 4, an output terminal of described microcontroller 1 is connected on the resistance regulation and control end Con of described resistance gating network 2, for changing the resistance of described resistance gating network 2; Described microcontroller 1 also connects described input-output apparatus 5, and for realizing, the current/voltage data of current collecting device collection are transferred to the external world, the external world also can be passed through input-output apparatus 5 and transmits control signal to microcontroller 1.In the present embodiment, above-mentioned voltage amplifier 3 adopts the cmos operational amplifier of high input impedance, Low-bias Current, and resistance R3, R4 adopt Low Drift Temperature, precision resister; Described A/D converter 4 adopts the imported A/D converter of bipolarity, realizes the collection of bipolar voltage.
For realizing the current acquisition of great dynamic range, the adjustable resistance module R2 that described resistance gating network 2 adopts multiple resistance and multiple switch combination to be formed, the assembled state controlling multiple switch by described microcontroller 1 changes the resistance that resistance gating network 2 accesses current return, namely changes the current range of current collecting device.Multiple resistance in adjustable resistance module R2 can be realized by mode in parallel, and as shown in Figure 3, when switch S 23 conducting, when S21, S22 disconnect, the resistance of adjustable resistance module R2 is 0; When switch S 21 conducting, when S22, S23 disconnect, the resistance of adjustable resistance module R2 is the value of R21; When switch S 22 conducting, when S21, S23 close, the resistance of adjustable resistance module R2 is the value of R22; Multiple resistance in adjustable resistance module R2 also realize by the mode of series connection, and as shown in Figure 4, when switch S 22 conducting, S21 disconnect, resistance R21 and R22 is by switch S 22 bypass, and the resistance of adjustable resistance module R2 is 0; When switch S 22 disconnects, during S21 conducting, resistance R21 is by switch S 21 bypass, and the resistance of adjustable resistance module R2 is the value of R22; When switch S 21 and S22 all disconnect, the resistance of adjustable resistance module R2 is R21, R22 sum.In the present embodiment, described multiple resistance all adopt the resistance of Low Drift Temperature, low noise; Described multiple switches all adopt the relay of low conduction impedance, also can use power MOS pipe.When practical application, quantity and the array mode of resistance and switch can be set as required, control the acquisition precision of current collecting device and gather range.
The utility model apply time, resistance gating network 2 as the sampling resistor of current collecting device, the current input terminal I of resistance gating network 2
inwith current output terminal I
outbe connected in the current return needing to gather electric current, the size of the voltage signal that microcontroller 1 comes according to voltage amplifier 3 collection, to the resistance of resistance gating network 2 regulation and control end Con transmit button switching signal, control the resistance in adjustable resistance module R2 access current return, make current collecting device can gather the current value of different range of current, realize the automatic switchover of the current acquisition range of current collecting device.
For preventing overcurrent influential system stability; at the two ends of described adjustable resistance module R2, also parallel join has bypass diode D1 and bypass diode D2; two-way parallel diode circuit is for realizing the bidirectional flow-through protection of current collecting device; ensure that current collecting device can not be burned when gathering larger electric current.Bypass diode D1 and bypass diode D2 adopts heavy-duty diode, and forward conduction electric current is not less than the collectable maximum current of current collecting device.As shown in Figure 5, in the present embodiment, the input end of diode D1 is connected with the output terminal of D2, and the output terminal of diode D1 is connected with the input end of D2, realizes adjusting current measurement range among a small circle.
It can also be seen that from Fig. 5, described resistance gating network 2 is also provided with the feedback resistance R1 connected with described adjustable resistance module R2, wherein: one end of adjustable resistance module R2 is as the current input terminal I of resistance gating network 2
in, one end of feedback resistance R1 is as the current output terminal I of resistance gating network 2
out, the common port of feedback resistance R1 and adjustable resistance module R2 is as the feedback end Ref of resistance gating network 2, and the Switch Control end in adjustable resistance module R2 is as described resistance regulation and control end Con.Feedback resistance R1 makes current collecting device have current feedback loop, and feedback resistance R1 together with adjustable resistance module R2 as the sampling resistor of current collecting device, add the robustness of sampling resistor place current return.In addition, in the specific implementation, be ensure the stability of system and precision, feedback resistance R1 adopts the current sampling resistor of high-power, Low Drift Temperature, low noise, little resistance, and resistance is chosen for 0.01 Ω ~ 1 Ω, and feedback resistance R1 gets 0.01 Ω in the present embodiment.
In conjunction with above-mentioned high precision Larger Dynamic current collecting device, another object of the present utility model is to provide a kind of constant voltage/constant current electric power system based on high precision Larger Dynamic current collecting device, as shown in Figure 6, on the basis of above-mentioned high precision Larger Dynamic current collecting device, also be provided with direct supply 6 and loading interfaces 7, the positive pole of described direct supply 6 connects the high level output end of described loading interfaces 7, the current input terminal I of described resistance gating network 2
inconnect the low level output end of described loading interfaces 7, the current output terminal I of described resistance gating network 2
outconnect the negative pole of described direct supply 6, the feedback end Ref of described resistance gating network 2 is also connected with the feedback end ref of described direct supply 6, for ensureing the stability of above-mentioned electric power system, and the current output terminal I of described direct supply 6 and resistance gating network 2
outground connection.
During use, the power interface of load is connected in the loading interfaces 7 of above-mentioned electric power system, microcontroller 1 judges the scope of present load according to the voltage signal that voltage amplifier 3 collection is come, and access the resistance in current return according to load required voltage/current value adjustment adjustable resistance module R2, realize the change of the output voltage/electric current of electric power system.Because load dynamic range is comparatively large, the Current Negative Three-Point Capacitance loop that constant current source is formed by feedback resistance R1, guarantees that output current value keeps constant; Constant pressure source, when there is overcurrent, equally by the voltage feedback loop that feedback resistance R1 is formed, guarantees that output voltage values keeps constant.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (5)
1. a high precision Larger Dynamic current collecting device, is characterized in that:
Comprise microcontroller (1), resistance gating network (2), voltage amplifier (3), A/D converter (4) and input-output apparatus (5); Described resistance gating network (2) for access need gather electric current current return in, its resistance is adjustable, and this resistance gating network (2) is provided with current input terminal I
in, current output terminal I
outand resistance regulation and control end Con; The input end of described voltage amplifier (3) is connected to the current input terminal I of described resistance gating network (2)
in, for gathering the current input terminal I of described resistance gating network (2)
involtage signal and realize signal amplify; The output terminal of described voltage amplifier (3) is connected with the input end of described A/D converter (4), the input end of microcontroller (1) described in the output termination of described A/D converter (4), an output terminal of described microcontroller (1) is connected on the resistance regulation and control end Con of described resistance gating network (2), for changing the resistance of described resistance gating network (2); Described microcontroller (1) also connects described input-output apparatus (5), for realizing data transmission and external control.
2. high precision Larger Dynamic current collecting device according to claim 1, it is characterized in that: described resistance gating network (2) comprises the adjustable resistance module R2 of multiple resistance and multiple switch combination formation, the assembled state being controlled multiple switch by described microcontroller (1) changes the resistance that resistance gating network (2) accesses current return.
3. high precision Larger Dynamic current collecting device according to claim 2, is characterized in that: at the two ends of described adjustable resistance module R2, also parallel join has bypass diode D1 and bypass diode D2, for realizing bidirectional flow-through protection.
4. the high precision Larger Dynamic current collecting device according to Claims 2 or 3, it is characterized in that: described resistance gating network (2) is also provided with the feedback resistance R1 connected with described adjustable resistance module R2, wherein: one end of adjustable resistance module R2 is as the current input terminal I of resistance gating network (2)
in, one end of feedback resistance R1 is as the current output terminal I of resistance gating network (2)
out, the common port of feedback resistance R1 and adjustable resistance module R2 is as the feedback end Ref of resistance gating network (2), and the Switch Control end in adjustable resistance module R2 is as described resistance regulation and control end Con.
5. based on the constant voltage/constant current electric power system of high precision Larger Dynamic current collecting device according to claim 4, it is characterized in that: be also provided with direct supply (6) and loading interfaces (7), the positive pole of described direct supply (6) connects the high level output end of described loading interfaces (7), the current input terminal I of described resistance gating network (2)
inconnect the low level output end of described loading interfaces (7), the current output terminal I of described resistance gating network (2)
outconnect the negative pole of described direct supply (6), the feedback end Ref of described resistance gating network (2) is also connected with the feedback end ref of described direct supply (6).
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Cited By (9)
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| CN106405187A (en) * | 2016-08-16 | 2017-02-15 | 江苏东方航天校准检测有限公司 | Adaptive controllable air resistor |
| CN106992565A (en) * | 2017-04-19 | 2017-07-28 | 中国人民解放军第四三二八工厂 | A kind of Battery Constant Current Discharging Device |
| CN107422163A (en) * | 2017-08-08 | 2017-12-01 | 国网山东省电力公司沂源县供电公司 | Simple wide range A.C. voltmeter |
| CN111398888A (en) * | 2020-04-14 | 2020-07-10 | 南方电网科学研究院有限责任公司 | Low-power-consumption dynamic monitoring device and equipment of intelligent electric meter and using method |
| CN113295914A (en) * | 2021-06-29 | 2021-08-24 | 珠海格力电器股份有限公司 | Current sampling circuit, current sampling device and frequency conversion control system |
| WO2022068300A1 (en) * | 2020-09-30 | 2022-04-07 | 长鑫存储技术有限公司 | Power consumption measuring assembly and method, and chip power consumption measuring device |
| CN114844003A (en) * | 2022-05-05 | 2022-08-02 | 北京市科通电子继电器总厂有限公司 | Intelligent power distributor control method and terminal |
| CN115932556A (en) * | 2023-03-09 | 2023-04-07 | 泉州昆泰芯微电子科技有限公司 | Magnetic chip test circuit and magnetic chip test set |
| US12032022B2 (en) | 2020-09-30 | 2024-07-09 | Changxin Memory Technologies, Inc. | Power consumption measurement assembly and method, and chip power consumption measurement device |
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2015
- 2015-08-26 CN CN201520647700.XU patent/CN205015773U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405187A (en) * | 2016-08-16 | 2017-02-15 | 江苏东方航天校准检测有限公司 | Adaptive controllable air resistor |
| CN106992565A (en) * | 2017-04-19 | 2017-07-28 | 中国人民解放军第四三二八工厂 | A kind of Battery Constant Current Discharging Device |
| CN107422163A (en) * | 2017-08-08 | 2017-12-01 | 国网山东省电力公司沂源县供电公司 | Simple wide range A.C. voltmeter |
| CN111398888A (en) * | 2020-04-14 | 2020-07-10 | 南方电网科学研究院有限责任公司 | Low-power-consumption dynamic monitoring device and equipment of intelligent electric meter and using method |
| WO2022068300A1 (en) * | 2020-09-30 | 2022-04-07 | 长鑫存储技术有限公司 | Power consumption measuring assembly and method, and chip power consumption measuring device |
| US12032022B2 (en) | 2020-09-30 | 2024-07-09 | Changxin Memory Technologies, Inc. | Power consumption measurement assembly and method, and chip power consumption measurement device |
| CN113295914A (en) * | 2021-06-29 | 2021-08-24 | 珠海格力电器股份有限公司 | Current sampling circuit, current sampling device and frequency conversion control system |
| CN114844003A (en) * | 2022-05-05 | 2022-08-02 | 北京市科通电子继电器总厂有限公司 | Intelligent power distributor control method and terminal |
| CN115932556A (en) * | 2023-03-09 | 2023-04-07 | 泉州昆泰芯微电子科技有限公司 | Magnetic chip test circuit and magnetic chip test set |
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Address after: Building 2, No. 25 Qiangwei Road, Changshengqiao Town, Nan'an District, Chongqing, 401336 Patentee after: CHONGQING HUILING ELECTRON NEW TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 401336 No. 7 Camellia Road, Nan'an District, Chongqing Patentee before: CHONGQING HUILING ELECTRON NEW TECHNOLOGY Co.,Ltd. Country or region before: China |