CN207037519U - A kind of control circuit of pulse electric current duration - Google Patents
A kind of control circuit of pulse electric current duration Download PDFInfo
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- CN207037519U CN207037519U CN201720950388.0U CN201720950388U CN207037519U CN 207037519 U CN207037519 U CN 207037519U CN 201720950388 U CN201720950388 U CN 201720950388U CN 207037519 U CN207037519 U CN 207037519U
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- sources
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- electric quantity
- quantity change
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Abstract
The utility model provides a kind of control circuit of pulse electric current duration, is connected with the current output terminal in V/I sources, and the V/I sources output includes pulse current and DC current, and the control circuit includes what is be sequentially connected：Electric quantity change monitoring module, for detecting the electric quantity change of V/I sources output pulse current, the output signal when the electric quantity change reaches preset value；Control module, its signal output part are connected to the V/I sources and exported to measured device on the loop of test signal, and the control module controls the disconnection in the loop according to the output signal.The electric quantity change of V/I sources pulse current is monitored by electric quantity change monitoring module, the electric quantity change time corresponding when reaching preset value is pulse electric current duration, the loop being connected when electric quantity change reaches preset value by control module cut-out with measured device, so that by the current control in V/I sources in a rational time range, to ensure the safety of circuit and measured device.
Description
Technical field
Test circuit technical field is the utility model is related to, particularly a kind of control circuit of pulse electric current duration.
Background technology
V/I sources constant voltage/constant current is directed to the output of pulse current, because loop power level circuit is directly from switch electricity
Source output current, and switch power supply output current ability is larger, and the control to current duration is lacked on hardware circuit, it is right
All there is potential safety hazard in measured device and VI sources, when serious device or board can be caused to burn in itself.If fixed using limiting
Current duration, it will make it that the duration of this low current can also be limited when V/I sources export a DC current
System, so as to reduce the ease for use of product.
Utility model content
Main purpose of the present utility model is to provide a kind of control circuit of pulse electric current duration, with V/I sources
Current output terminal connects, and the current output terminal output in the V/I sources includes pulse current and DC current, the control circuit bag
Include what is be sequentially connected：
Electric quantity change monitoring module, for detecting the electric quantity change of V/I sources pulse current gear, when the electric quantity change reaches
To output signal during preset value；
Control module, its signal output part connection measured device, the control module control it according to the output signal
With the disconnection in measured device loop.
By upper, the electric quantity change in V/I sources is monitored by electric quantity change monitoring module, it is right that electric quantity change reaches preset value when institute
The time answered is pulse electric current duration, passes through control module cut-out and measured device when electric quantity change reaches preset value
The loop of connection, so as to by the current control in V/I sources in a rational time range, to ensure circuit and measured device
Safety.
Wherein, the electric quantity change monitoring module includes：
The RC circuits being connected in series, wherein resistance are connected with the current output terminal in the V/I sources, capacity earth；
Comparator circuit, one input end are connected with the capacitor equivalent input of the RC circuits, another input connection
One reference voltage, output end connect the control module.
By upper, by collecting the voltage change of V/I source output terminals, only voltage change reach it is default it is consumed when
Between, just it is considered the current output time in rational V/I sources.
Wherein, the comparator circuit includes two-way comparator, the one input end of two-way comparator and the RC circuits
The connection of capacitor equivalent input, another input of two-way comparator connects a positive and negative reference voltage, two-way comparator respectively
Output end connect the control module.
By upper, for the characteristic of circuit, respectively by the reference voltage that two-way comparator is connected be arranged on the occasion of and negative value,
So as to which capacitance voltage in RC circuits to be reached to the current output time that the time of the reference voltage is considered rational V/I sources.
Wherein, in addition to the on-off circuit that is formed of the switch and second resistance that are connected in series, the on-off circuit and institute
The electric capacity stated in RC circuits is connected in parallel；
When the current output terminal DC current of the V/I sources (100), the switch closure.
By upper, when exporting DC current in V/I sources, due to there is the presence of second resistance so that in RC circuits on electric capacity
Residual charge can quickly be released by second resistance.
Wherein, the electric quantity change monitoring module includes multiplier, and the input of its two-way is respectively the electric current and electricity in V/I sources
Pressure.
By upper, the power in V/I sources is calculated in real time by multiplier, can be directly by power output to control module so that control
Adjustment foundation of the molding block using power as the pulse duration.
Wherein, in addition to follower, the output end in its input connection V/I sources, output end connection electric quantity change monitor mould
The input of block.
By upper, follower can make output current follow input voltage/curent change, have input impedance height, and export
The low characteristic of impedance, so as to play a part of buffering, isolation, improve load capacity.
Brief description of the drawings
Fig. 1 is the principle schematic of the control circuit of pulse electric current duration.
Embodiment
The control circuit of pulse electric current duration described in the utility model is described in detail referring to Fig. 1.
It is as shown in Figure 1 circuit theory schematic diagram, including be sequentially connected：
V/I sources 100, for exporting test electric current to measured device.
The current range in the V/I sources 100 comprises at least a pulse current gear position and a direct current current gear position, with respectively
Corresponding output pulse current and DC current.Inside the V/I sources 100, including a current sampling resistor RS, and be parallel to
First operational amplifier at the current sampling resistor RS both ends.
Wherein, current sampling resistor RS passes through ohm law reaction test electric current.Due to can be detected in circuit all
It is voltage signal, it is impossible to current signal is detected, so obtaining test electric current in this way.
First operational amplifier is used to the voltage at current sampling resistor RS both ends being amplified (normalization) processing,
To be converted to equivalent voltage signal of the full scale as ± 10V.The equivalent voltage signal one end is exported to detection port 200, the inspection
Survey port 200 and connect current detection module, so as to be converted to electric current to the equivalent voltage signal received, with to the institute of V/I sources 100
The current value of output carries out Real-time Feedback detection.Above-mentioned detection has no direct correlation with the application, therefore repeats no more.The equivalent electric
The other end of pressure signal is exported to connected follower 300.
Follower 300, effect is driven for improving.
V/I sources 100 directly can be connected by the present embodiment with electric quantity change monitoring module 400 described hereinafter.But increase follows
Device 300 can make output current follow input current to change, and specifically, the multiplication factor perseverance of output current is less than and is approached
1.The distinguishing feature of follower 300 is input impedance height, and output impedance is low, so as to play buffering, isolation, improve load capacity
Effect.
Electric quantity change monitoring module 400, for controlling the pulse electric current duration in V/I sources 100.The electric quantity change prison
Control module 400 comprises at least an aware circuit.
The aware circuit is the RC integrating circuit and comparator circuit of a series connection, the resistance R in RC integrating circuit with
The follower 300 connects, electric capacity C ground connection.Electrical voltage point between the resistance R and electric capacity C is labeled as Uc in Fig. 1.
The one input end of comparator circuit connects the Uc points, and another input connects a reference voltage, and output end connects
Connect control module 500.For example, the reference voltage may be configured as -3V~+3V any voltage value.Control module 500
Signal output part is connected to V/I sources 100 and exported to measured device on the loop of test signal.The control module 500 includes one
Fpga chip and a power switch, fpga chip is used for the output signal according to comparator, to adjust the opening and closing of power switch, from
And V/I sources 100 are controlled to be connected with measured device the disconnection in loop.
Preferably, the generating positive and negative voltage characteristic according to circuit, can use two-way comparator.Wherein, the same phase of first comparator
The reverse input end of input and the second comparator is commonly connected to the Uc points, the reverse input end of first comparator and second
The in-phase input end of comparator each connects a reference voltage.In the present embodiment, the reference voltage is arranged to ± 3V.First ratio
Output end compared with device and the second comparator is commonly connected to control module 500.
Preferably, also including one group of on-off circuit in electric quantity change monitoring module 400, the on-off circuit is opened including first
K and second switch K1 are closed, two switches are arranged to be servo-actuated with the electric current gear in foregoing V/I sources 100.
Wherein described first switch K is connected to the input of follower 300, when the electric current gear in V/I sources 100 is pulse electricity
During stream, the first switch K is closed to the output end in V/I sources 100；When the electric current gear in V/I sources 100 is DC current, institute
State first switch K and be closed to ground wire.
It is in parallel with the electric capacity C in the aware circuit after second switch K1 series connection second resistances R1.When the electricity in V/I sources 100
When stream gear is pulse current, the second switch K1 disconnects；When the electric current gear in V/I sources 100 is DC current, described
Two switch K1 closures.
The operation principle of the control circuit of the application pulse electric current duration is as follows：
When user, which sets V/I sources 100, exports pulse current, first switch K is closed to the output end in V/I sources 100, and second
K1 is switched to disconnect.So that the full scale that is exported of V/I sources 100 be ± 10V voltage signal after follower 300,
Voltage Uc is formed on electric capacity C in electric quantity change monitoring module 400.The pulse current duration that V/I sources 100 export is got over
Long, the voltage Uc on electric capacity C is bigger.The voltage Uc passes through first, second comparator, when the voltage Uc is in the range of ± 3V
When, first, second comparator does not export；When the voltage Uc exceedes ± 3V, the first or second comparator output high level.
Control module 500 adjusts its power switch to disconnect, that is, controls V/I sources 100 and measured device phase according to the high level received
The disconnection of link circuit.
When user, which sets V/I sources 100, exports DC current, first switch K is closed to ground wire, second switch K1 closures.
Now by the signal that V/I sources 100 are exported can not connect electric quantity change monitoring module 400, thus the voltage Uc on electric capacity C is
0V.Now control module 500 does not work.And due to there is second resistance R1 presence so that the residual charge on electric capacity C can lead to
Second resistance R1 is crossed quickly to release.
In the application, due to there is provided electric quantity change monitoring module 400, utilizing the charging interval of electric capacity in RC integrating circuit
Carry out the approximate duration for controlling pulse current, so as to be effectively protected to measured device.
Preferred embodiment of the present utility model is the foregoing is only, not to limit the utility model, for example, by
First, the reference voltage of the second comparator is arranged to different value to regulate and control electric capacity C charging interval, you can is held so that pulse is adjusted flexibly
The continuous time.
In another example aware circuit is realized by multiplier, its two input is respectively sampling resistor Rs voltage and process
Amplifier amplification (normalization) processing in V/I sources 100 is converted to full scale as the equivalent voltage after ± 10V, the master of multiplier
It is to realize two orthogonal signal multiplications to want function, i.e., output signal is directly proportional to two input signal products, therefore multiplier
Output be used to represent sampling resistor Rs power situation.
It is corresponding, now the reference voltage of first, second comparator using voltage corresponding to the power as adjustment foundation, with
Adjusted corresponding to carrying out.For example, being foundation by 5W of sampling resistor Rs power, now 5W corresponding voltages are ± 5V, then by first,
The reference voltage of second comparator is respectively set to ± 5V.Thus, when sampling resistor Rs power is more than 5W, i.e. multiplier
Output exceedes ± 5V, and now the first or second comparator exports high level to control module 500.Thus utilize sampling resistor Rs's
Changed power carrys out the approximate duration for controlling pulse current,
For another example control module 500 can be directly connected to after multiplier, by the fpga chip in the control module 500
The performance number exported to multiplier judges, after power reaches preset value, the fpga chip output in control module 500
Control signal, that is, control V/I sources 100 to be connected with measured device the disconnection in loop.
In a word, it is all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc.,
It should be included within the scope of protection of the utility model.
Claims (6)
1. a kind of control circuit of pulse electric current duration, it is connected with the current output terminal of V/I sources (100), the V/I sources
(100) output includes pulse current and DC current, it is characterised in that the control circuit includes what is be sequentially connected：
Electric quantity change monitoring module (400), for detecting the electric quantity change of V/I sources (100) output pulse current, when the electricity
Output signal when change reaches preset value；
Control module (500), its signal output part are connected to the V/I sources (100) and export returning for test signal to measured device
Lu Shang, the control module (500) control the disconnection in the loop according to the output signal.
2. control circuit according to claim 1, it is characterised in that the electric quantity change monitoring module (400) includes：
The RC circuits being connected in series, wherein resistance are connected with the current output terminal of the V/I sources (100), capacity earth；
Comparator circuit, one input end are connected with the capacitor equivalent input of the RC circuits, and another input connects a base
Quasi- voltage, output end connect the control module (500).
3. control circuit according to claim 2, it is characterised in that the comparator circuit includes two-way comparator, and two
The one input end of road comparator is connected with the capacitor equivalent input of the RC circuits, another input point of two-way comparator
Not Lian Jie a positive and negative reference voltage, the output end of two-way comparator connects the control module (500).
4. control circuit according to claim 2, it is characterised in that also include switch and the second resistance institute being connected in series
The on-off circuit of composition, the on-off circuit are connected in parallel with the electric capacity in the RC circuits；
When the current output terminal of the V/I sources (100) exports DC current, the switch closure.
5. control circuit according to claim 1, it is characterised in that the electric quantity change monitoring module (400) includes multiplying
Musical instruments used in a Buddhist or Taoist mass, the input of its two-way are respectively the electric current and voltage of V/I sources (100).
6. control circuit according to claim 1, it is characterised in that also including follower, its input connection V/I sources
(100) output end, the input of output end connection electric quantity change monitoring module (400).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720950388.0U CN207037519U (en) | 2017-08-01 | 2017-08-01 | A kind of control circuit of pulse electric current duration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720950388.0U CN207037519U (en) | 2017-08-01 | 2017-08-01 | A kind of control circuit of pulse electric current duration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207037519U true CN207037519U (en) | 2018-02-23 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720950388.0U Active CN207037519U (en) | 2017-08-01 | 2017-08-01 | A kind of control circuit of pulse electric current duration |
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| CN (1) | CN207037519U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948552A (en) * | 2020-08-19 | 2020-11-17 | 苏州万瑞达电气有限公司 | Pulse current generation method for battery test |
-
2017
- 2017-08-01 CN CN201720950388.0U patent/CN207037519U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948552A (en) * | 2020-08-19 | 2020-11-17 | 苏州万瑞达电气有限公司 | Pulse current generation method for battery test |
| CN111948552B (en) * | 2020-08-19 | 2023-04-25 | 苏州万瑞达电气有限公司 | Pulse current generation method for battery test |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100070 7 floor, No. 2, No. 1, Haiying Road, Fengtai District, Beijing Patentee after: Beijing Hua Feng measurement and control technology Limited by Share Ltd Address before: 100070 7 floor, No. 2, No. 1, Haiying Road, Fengtai District, Beijing Patentee before: BEIJING HUAFENG TEST & CONTROL TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |