CN202795112U - Constant-current square wave generating circuit - Google Patents
Constant-current square wave generating circuit Download PDFInfo
- Publication number
- CN202795112U CN202795112U CN201220459337.5U CN201220459337U CN202795112U CN 202795112 U CN202795112 U CN 202795112U CN 201220459337 U CN201220459337 U CN 201220459337U CN 202795112 U CN202795112 U CN 202795112U
- Authority
- CN
- China
- Prior art keywords
- square wave
- voltage
- current square
- low
- low pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The utility model provides a constant-current square wave generating circuit, consisting of a low-voltage poor-linearity voltage stabilizer, a capacitor and a resistor, wherein the capacitor is connected between the input end and the grounding end of the low-voltage poor-linearity voltage stabilizer, and the low-voltage poor-linearity voltage stabilizer is used for stabilizing input voltage; a feedback input end of the low-voltage poor-linearity voltage stabilizer is connected with the output end of the low-voltage poor-linearity voltage stabilizer, so as to stabilize output reference voltage; the resistor is connected between the output end of the low-voltage poor-linearity voltage stabilizer and the ground end of the low-voltage poor-linearity voltage stabilizer; and the resistor is used for generating output current as an output load of the low-voltage poor-linearity voltage stabilizer. The constant-current square wave generating circuit provided by the utility model has the advantages that three components can form the constant-current square wave generating circuit with a certain property; and the constant-current square wave generating circuit has the advantages of simple structure and low cost, and is beneficial to popularization and application in a measurement test in the middle-precision fields.
Description
Technical field
The utility model relates to a kind of Electronic Testing metering circuit, specifically a kind of constant current wave generator circuit.
Background technology
Constant current square wave circuit for generating is a kind ofly can produce the as shown in Figure 1 circuit of switching regulator constant current waveform.The constant current square wave generation circuit is widely used in miniwatt LDO(low pressure difference linear voltage regulator) performance test, Calibration of Current Probe, the dependence test fields of measurement such as inductor and transformer measurement.
Traditionally, constant current square wave circuit for generating uses discrete device to build, although can realize very high constant current accuracy and precipitous edge, but overall complexity is higher, and is strict to performance of devices, and cost is also higher, in the not high occasion of some performance requirements, economy is not high.
The structure of the constant current square wave circuit for generating built of tradition resolution element wholely is comprised of following several parts as shown in Figure 2: current switch, current detection circuit, reference circuits, error-detecting amplifying circuit, driving circuit.Wherein, current detection accuracy is subjected to the precision restriction of " current detection circuit ", " reference circuits " and circuit such as " error-detecting amplifying circuits ", and switching speed is subjected to the response speed restriction of " current detection circuit ", " error-detecting amplifying circuit ", " driving circuit " and circuit such as " current switches " and device.Because adopt discrete device, so complexity is higher, manufacture difficulty is larger, so cost is relative also higher, is unfavorable for that medium accuracy cost sensitivity type equipment directly adopts.
Therefore, be necessary to design a kind of enough simple, cost is enough cheap circuit again, realize the generation of constant current square wave, satisfy the requirement of medium accuracy constant current waveform generation.
The utility model content
It is very low, simple in structure that the technical problems to be solved in the utility model provides a kind of system complexity, and constant current square wave circuit for generating with low cost.
The utility model solves the problems of the technologies described above by the following technical solutions: a kind of constant current square wave circuit for generating, by a low pressure difference linear voltage regulator, an electric capacity and a resistance form, connect described electric capacity between the input end of described low pressure difference linear voltage regulator and the earth terminal, be used for stablizing input voltage, and the feedback input end of described low pressure difference linear voltage regulator is connected with output terminal, reference voltage with stable output, connect described resistance between the output terminal of described low pressure difference linear voltage regulator and the ground, resistance is as the output load of low pressure difference linear voltage regulator, for generation of output current.
The utility model can further be specially: described low pressure difference linear voltage regulator should be inputted with voltage, Voltage-output, and earth terminal, input enables the input/output port such as input and feed back input.
The utility model can further be specially: described capacitance selection appearance value is not less than 0.1uF and is not higher than the electric capacity of 10uF.
The utility model can further be specially: described resistance uses 1% precision adjustable resistance.
The utility model has the advantage of: use three components and parts can form the constant current square wave circuit for generating with certain performance, simple in structure, with low cost, be conducive in the measurement test of some medium accuracy occasions, apply.Sort circuit can produce in 10mA～100mA scope, the electric current square wave between 1Hz～1kHz frequency, and constant current accuracy can reach 1%, and rising time is not more than 5% of the cycle.
Description of drawings
Fig. 1 is constant current square-wave waveform figure.
Fig. 2 is traditional constant current square wave generation circuit theory diagram.
Fig. 3 is the utility model constant current square wave circuit for generating schematic diagram.
Fig. 4 is an embodiment circuit diagram of the utility model constant current square wave circuit for generating.
Embodiment
As shown in Figure 3, the utility model constant current square wave circuit for generating is comprised of a low pressure difference linear voltage regulator, an electric capacity and a resistance.
Described low pressure difference linear voltage regulator can use the low pressure difference linear voltage regulator of existing various models, and it has 5 ports: input end, earth terminal, Enable Pin, output terminal, and feedback input end.This low pressure difference linear voltage regulator is because input with enabling, so it has turn-off function.
Connect described electric capacity between the input end of described low pressure difference linear voltage regulator and the earth terminal, be used for stablizing input voltage, and the feedback input end of described low pressure difference linear voltage regulator is connected with output terminal, reference voltage with stable output, connect described resistance between the output terminal of described low pressure difference linear voltage regulator and the ground, resistance is as the output load of low pressure difference linear voltage regulator, for generation of output current.
The principle of work of the utility model constant current square wave circuit for generating is described below: the characteristic that the input current of the main dependence of this circuit realization low pressure difference linear voltage regulator equals output current realizes.The output current of low pressure difference linear voltage regulator equals reference voltage divided by the resistance of resistance, because reference voltage (being the output voltage of low-voltage difference linear constant voltage regulator) is a fixed value, and the resistance of place in circuit also is fixed value, so the output current of low pressure difference linear voltage regulator also is fixed value, final so that the input current of low pressure difference linear voltage regulator also be fixed value, thus locate to have realized the effect of a current constant in the constant current working point of the input end of low pressure difference linear voltage regulator.Further, the Enable Pin by the control low pressure difference linear voltage regulator makes the work of low pressure difference linear voltage regulator interruption, can realize the constant current square wave shown in Fig. 1 in the constant current working point.
As shown in Figure 4, be the example of an implementation of the utility model constant current square wave circuit for generating, described constant current square wave circuit for generating is comprised of a low pressure difference linear voltage regulator U1, a capacitor C 1 and a resistance R 2.
The model of low pressure difference linear voltage regulator U1 is selected BL9193-ADAAPRN, this is that the domestic ultra-low noise of a kind of 1% precision responds low pressure difference linear voltage regulator fast, inner integrated reference voltage Vref is 1.23V, 1% precision, 300mA electric current fan-out capability, 50us rapid boot-up time, each pinout of low pressure difference linear voltage regulator U1 is: 1 pin is the voltage input, and 2 pin are earth terminal, and 3 pin are for enabling input, 4 pin are Voltage-output, and 5 pin are feed back input.Capacitor C 1 is selected the 1uF multilayer capacitor, and resistance R 2 uses 1% precision adjustable resistance to adjust to 12.3 ohm, and the overall current constant current accuracy can control to 1% like this, the rise time can control to the minimum repetition period 5% in.Constant current square wave generation circuit by this embodiment realization, can be in constant current working point A point produces 10mA～100mA scope, electric current square wave between 1Hz～1kHz frequency, the continuous current precision can reach 1%, rise time is not more than 5% of the whole cycle, can be widely used in miniwatt LDO performance test, Calibration of Current Probe, inductor and transformer are measured with the constant current wave generator circuit and are used, and finish calibration or surveying work.
The above is only for the preferred embodiment of the invention; not in order to limit the invention; all in the invention spirit and principle within do any modification, be equal to and replace and improvement etc., all should be included within the protection domain of the invention.
Claims (4)
1. constant current square wave circuit for generating, it is characterized in that: formed by a low pressure difference linear voltage regulator, an electric capacity and a resistance, connect described electric capacity between the input end of described low pressure difference linear voltage regulator and the earth terminal, and the feedback input end of described low pressure difference linear voltage regulator is connected with output terminal, connects described resistance between the output terminal of described low pressure difference linear voltage regulator and the ground.
2. a kind of constant current square wave circuit for generating as claimed in claim 1, it is characterized in that: described low pressure difference linear voltage regulator has 5 ports: input end, earth terminal, Enable Pin, output terminal, and feedback input end.
3. a kind of constant current square wave circuit for generating as claimed in claim 2, it is characterized in that: described capacitance selection appearance value is not less than 0.1uF and is not higher than the electric capacity of 10uF.
4. a kind of constant current square wave circuit for generating as claimed in claim 3, it is characterized in that: described resistance uses 1% precision adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220459337.5U CN202795112U (en) | 2012-09-11 | 2012-09-11 | Constant-current square wave generating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220459337.5U CN202795112U (en) | 2012-09-11 | 2012-09-11 | Constant-current square wave generating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202795112U true CN202795112U (en) | 2013-03-13 |
Family
ID=47822346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220459337.5U Expired - Lifetime CN202795112U (en) | 2012-09-11 | 2012-09-11 | Constant-current square wave generating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202795112U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446410A (en) * | 2015-11-27 | 2016-03-30 | 深圳市芯海科技有限公司 | Method for calibrating low-dropout linear voltage stabilizer |
| CN105628522A (en) * | 2016-03-30 | 2016-06-01 | 中国工程物理研究院流体物理研究所 | Step signal and electric probe test circuit for measuring dense substance front interface of metal |
-
2012
- 2012-09-11 CN CN201220459337.5U patent/CN202795112U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446410A (en) * | 2015-11-27 | 2016-03-30 | 深圳市芯海科技有限公司 | Method for calibrating low-dropout linear voltage stabilizer |
| CN105628522A (en) * | 2016-03-30 | 2016-06-01 | 中国工程物理研究院流体物理研究所 | Step signal and electric probe test circuit for measuring dense substance front interface of metal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203630198U (en) | Battery voltage detection circuit | |
| CN203759106U (en) | Commercial power zero cross detection circuit | |
| CN207946506U (en) | A kind of module for testing electronic load | |
| CN203376374U (en) | Voltage sensing module based on photoelectric couplers | |
| CN202795112U (en) | Constant-current square wave generating circuit | |
| CN203870226U (en) | DC electronic load under constant current work mode | |
| CN106357107A (en) | Voltage regulating circuit and programmable power supply | |
| CN203275469U (en) | Switch-type electronic load | |
| CN203502448U (en) | Simple signal wave generator | |
| CN104049125A (en) | Linear voltage detection method based on photoelectric couplers | |
| CN109307807A (en) | The measuring device of capacitor C and ESR in a kind of big frequency range | |
| CN204119024U (en) | A kind of voltage signal conditioning circuit based on TL431 | |
| CN203387422U (en) | High-efficiency numerical-control voltage-stabilized power supply | |
| CN204066006U (en) | The low differential voltage linear voltage stabilizer circuit of computer power | |
| CN207766145U (en) | A kind of MCU power supply circuits and electronic equipment | |
| CN204228946U (en) | A kind of electric energy meter error calibrating installation | |
| CN202916330U (en) | Current sensor used for static synchronous compensator | |
| CN204389668U (en) | A kind of ground voltage influence amount simulator | |
| CN103698562B (en) | A kind of electronic load device and emulation mode thereof | |
| CN203811689U (en) | Simple capacitance measuring apparatus | |
| CN206756919U (en) | Voltage detecting system | |
| CN202661522U (en) | Four-wire system shunt | |
| CN205066672U (en) | Aeroengine pressurized strut path measurement device | |
| CN204514973U (en) | A kind of AC electronic load device improving waveform distortion under rectification mode | |
| CN202956422U (en) | Novel precision current detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190806 Address after: 230088 Room 1201, A4 Floor, International Animation Base, 8000 Wangjiangxi Road, Hefei High-tech Zone, Anhui Province Patentee after: Anhui Huami Information Technology Co.,Ltd. Address before: 230000 R&D Building of Four Stars Company, No. 9 Mengyuan Road, Hefei High-tech Zone, Anhui Province Patentee before: HEFEI HUAHENG ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |