CN202978837U - Differential motion ratio amplifying circuit - Google Patents
Differential motion ratio amplifying circuit Download PDFInfo
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- CN202978837U CN202978837U CN2013200062437U CN201320006243U CN202978837U CN 202978837 U CN202978837 U CN 202978837U CN 2013200062437 U CN2013200062437 U CN 2013200062437U CN 201320006243 U CN201320006243 U CN 201320006243U CN 202978837 U CN202978837 U CN 202978837U
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- circuit
- amplifying circuit
- ratio amplifying
- differential motion
- signals
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Abstract
Provided is a differential motion ratio amplifying circuit. An electronic circuit of the differential motion ratio amplifying circuit comprises a static electricity protection circuit, an analog switching circuit, a low-pass filter circuit, a bias voltage circuit and a ratio amplifying circuit with a capacitor filter. The work mode of the differential motion ratio amplifying circuit comprises that the static electricity protection circuit is used for preventing static electricity from being damaged, the analog switching circuit is turned on in a delayed mode to avoid pulse peaking of signals occurring when power devices are connected, the low-pass filter circuit inhibits the high frequency parts in the signals, a differential motion amplifying circuit inhibits a common-mode signal in the signals, the bias voltage circuit can detect negative voltage signals in a designed scope, a capacitor is connected on a resistor with a ratio amplifying function in a parallel mode, and thus the function of inhibiting high frequency signals is achieved, and the amplifying function of low frequency signals is achieved. The differential motion ratio amplifying circuit has the advantages of being capable of amplifying small signals, adjustable in amplification factor, protected in static electricity, small in interference and the like. The differential motion ratio amplifying circuit is a current sampling signal amplifying circuit mainly used in a control system of a motor.
Description
Technical field
The utility model relates to a kind of electric control system, relates in particular to a kind of differential ratio amplifying circuit.
Background technology
In electric machine control system, need to measure the size of current of motor, calculate accordingly, realize current closed-loop control, over maximum, the closing switch pipe, realize overcurrent protection function at once when electric current.In existing size of current testing circuit, the technical scheme of using mainly contains two kinds: utilize operational amplifier composition amplifying circuit and Hall current sensor.Hall current sensor is limited by device self, and tiny current measurement is inaccurate, and external environment affects its precision, can not be applicable to high-precision current and detect occasion; The ratio amplifying circuit can not suppress common-mode signal to be disturbed, the precision of impact sampling, and the current spike pulse that produces when switching tube is opened may cause the motor torque fluctuation of system, the misoperation that produces overcurrent protection.
The utility model content
For addressing the above problem, the purpose of this utility model is to provide a kind of differential ratio amplifying circuit, guarantees motor when carrying is rotated, and the hydraulic oil pushing piston is carried out power-assisted output.
The technical solution adopted in the utility model is as follows:
A kind of differential ratio amplifying circuit comprises
Electrostatic discharge protective circuit, analog switching circuit, the ratio amplifying circuit of bias voltage circuit and capacitor filtering.Bias voltage circuit, analog switching circuit are connected to the ratio amplifying circuit of capacitor filtering, and electrostatic discharge protective circuit is connected with analog switching circuit.
The ratio amplifying circuit of capacitor filtering is comprised of operational amplifier N3, resistance R 3, R4, R5, R8, R9, R11 and capacitor C 4.
Bias voltage circuit is to be produced by resistance R 6 and resistance R 7, resistance R 6 and resistance R 7 series connection.
Analog switching circuit comprises that analog switch K1, analog switch K2 and low-pass filter circuit form.
Low-pass filter circuit is by R1 and C1, R2 and C2, and R10 and C3 form.
Electrostatic discharge protective circuit is made of diode D1 and diode D2.
The utility model the utlity model has and can amplify tiny signal, and multiplication factor is adjustable, and electrostatic protection disturbs the characteristics such as little.Solved prior art existing: in current signal detection circuit, owing to adopting operational amplifier composition amplifying circuit, use Hall current sensor sampling tiny current measurement inaccurate, the external environment impact, can not suppress common-mode signal disturbs, the current spike pulse that switching tube is opened generation is difficult to avoid, thereby affects the technical problems such as the stability of a system.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model one embodiment.
Embodiment
Below describe the technical solution of the utility model in detail.Only for the explanation concrete structure, the scale of this structure is not subjected to the restriction of embodiment to the utility model embodiment.
As shown in Figure 1, operational amplifier N3, R3, R4, R5, R8, R9, R11 and capacitor C 4 circuit consist of differential ratio amplifying circuit, resistance R 8 and resistance R 9 series connection, resistance R 3 one ends are connected with resistance R 5 one ends, and jointly be connected in the positive pole of operational amplifier N3, resistance R 8 one ends are connected with resistance R 4 one ends, and jointly are connected in the negative pole of operational amplifier N3.After R11 and capacitor C 4 parallel connections, two ends are connected with filter circuit with resistance R 9 respectively.Resistance R 6 and resistance R 7 series connection consist of bias voltage circuit, and resistance R 5 one ends are connected in resistance R 6.Resistance R 1 and capacitor C 1 series connection, resistance R 2 and capacitor C 2 series connection, resistance R 10 and capacitor C 3 series connection, and jointly consist of filter circuit.K1 and K2 consist of analog switching circuit; Diode D1 and diode D2 consist of electrostatic discharge protective circuit.The present embodiment need to provide control signal K11 and K12.
Working method is: when the switching tube conducting, with open-minded after control signal K11 and K12 time-delay, can avoid the spike that produces in the moment that switching tube is opened; Current signal U+ and U-carry out differential input, suppress common-mode signal, after electrostatic discharge protective circuit through diode D1 and D2, by R1 and C1, R2 and C2 carry out the filtering of signal, after adding the bias voltage of R6 and R7 dividing potential drop, carry out differential ratio and amplify, while C4 filtering high frequency composition is at last by exporting after R10 and C3 circuit filtering; When switching tube was closed, K11 and K12 provided shutdown signal, and the shutoff signal input enters the wait detected state.
The utility model is mainly used in the current sampling signal amplifying circuit in electric machine control system, realizes differential ratio enlarging function, also can be used for the internal system excess current protective function.
Claims (5)
1. a differential ratio amplifying circuit, is characterized in that comprising
Electrostatic discharge protective circuit, analog switching circuit, the ratio amplifying circuit of bias voltage circuit and capacitor filtering; Bias voltage circuit, analog switching circuit are connected to the ratio amplifying circuit of capacitor filtering, and electrostatic discharge protective circuit is connected with analog switching circuit.
2. differential ratio amplifying circuit according to claim 1, is characterized in that the ratio amplifying circuit of described capacitor filtering is comprised of operational amplifier N3, resistance R 3, R4, R5, R8, R9, R11 and capacitor C 4.
3. differential ratio amplifying circuit according to claim 1, is characterized in that described bias voltage circuit is resistance R 6 and resistance R 7 generations by series connection.
4. differential ratio amplifying circuit according to claim 1, it is characterized in that described analog switching circuit comprises that analog switch K1, analog switch K2 and low-pass filter circuit form, described low-pass filter circuit is by R1 and C1, R2 and C2, and R10 and C3 form.
5. differential ratio amplifying circuit according to claim 1, is characterized in that described electrostatic discharge protective circuit is made of diode D1 and diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200062437U CN202978837U (en) | 2013-01-07 | 2013-01-07 | Differential motion ratio amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200062437U CN202978837U (en) | 2013-01-07 | 2013-01-07 | Differential motion ratio amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978837U true CN202978837U (en) | 2013-06-05 |
Family
ID=48519856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200062437U Expired - Fee Related CN202978837U (en) | 2013-01-07 | 2013-01-07 | Differential motion ratio amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978837U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034957A (en) * | 2014-06-11 | 2014-09-10 | 台达电子企业管理（上海）有限公司 | Power supply changeover system and voltage sampling device thereof |
| TWI596857B (en) * | 2016-12-30 | 2017-08-21 | 致茂電子股份有限公司 | Testing equipment having function of electro static discharge protection |
| CN108983065A (en) * | 2017-06-02 | 2018-12-11 | 中兴通讯股份有限公司 | A kind of voltage amplifier circuit, detection circuit and its circuit detecting method |
-
2013
- 2013-01-07 CN CN2013200062437U patent/CN202978837U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034957A (en) * | 2014-06-11 | 2014-09-10 | 台达电子企业管理（上海）有限公司 | Power supply changeover system and voltage sampling device thereof |
| US9658258B2 (en) | 2014-06-11 | 2017-05-23 | Delta Electronics (Shanghai) Co., Ltd. | Power conversion system and voltage sampling device thereof |
| TWI596857B (en) * | 2016-12-30 | 2017-08-21 | 致茂電子股份有限公司 | Testing equipment having function of electro static discharge protection |
| CN108983065A (en) * | 2017-06-02 | 2018-12-11 | 中兴通讯股份有限公司 | A kind of voltage amplifier circuit, detection circuit and its circuit detecting method |
| CN108983065B (en) * | 2017-06-02 | 2022-07-29 | 中兴通讯股份有限公司 | Voltage amplifying circuit, detection circuit and circuit detection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20150107 |
|
| EXPY | Termination of patent right or utility model |