CN201327598Y - Numerical control constant-current source device with separation - Google Patents
Numerical control constant-current source device with separation Download PDFInfo
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- CN201327598Y CN201327598Y CNU2008201904126U CN200820190412U CN201327598Y CN 201327598 Y CN201327598 Y CN 201327598Y CN U2008201904126 U CNU2008201904126 U CN U2008201904126U CN 200820190412 U CN200820190412 U CN 200820190412U CN 201327598 Y CN201327598 Y CN 201327598Y
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Abstract
The utility model provides a numerical control constant-current source device with separation, which comprises a voltage control constant-current source circuit; a D/A converter module, a separation converter and a second-order low-pass filter which are orderly connected are arranged at the front of the voltage control constant-current source circuit; and the output of the second-order low-pass filter is connected with the voltage control constant-current source circuit for control a resistor network control circuit in an secondary way. The resistor network control circuit is orderly connected with an amplifying circuit and a push-pull driver circuit; the push-pull driver circuit is connected with the input end of a reference resistor; the input end of the reference resistor is also electrically connected with the resistor network control circuit; and the output end of the reference resistor is a constant-current output end of the numerical control constant-current source device. The output end of the reference resistor is connected with the voltage feedback wire of the resistor network control circuit. The output end of the reference resistor is electrically connected with the resistor network control circuit through a voltage follower circuit.
Description
Technical field
The utility model relates to a kind of digital-control constant-flow source device with isolation, belongs to the electronic circuit control field.
Background technology
Along with the development of electronic circuit industry, the requirement that needs numerical control Heng Yuan is increased gradually.In Industry Control, require main control circuit and peripheral circuit to isolate fully especially, peripherals provides reliability of system operation to the interference that main equipment causes in the minimizing system operational process.
At present, circuit or output accuracy that the great majority band is isolated are lower, and usable range is narrow; Components and parts are many, circuit complexity, cost height.Influence the precision and the production cost of control system largely.
Summary of the invention
The purpose of this utility model is to realize the miniature numerical control constant-current source circuit of band isolation output, realizes the isolation fully of main control circuit and output interface circuit, and conversion efficiency height, output current precision height and carrying load ability are strong.
The technical solution of the utility model: the digital-control constant-flow source device that band of the present utility model is isolated comprises the voltage controlled current source circuit, before the voltage controlled current source circuit, the D/A converter module that connects is successively arranged, isolating converter and second-order low-pass filter, the output of second-order low-pass filter is connected to the resistor network control circuit that the voltage controlled current source circuit is assisted control, the resistor network control circuit is connected to amplifying circuit and push-pull driver circuit successively, push-pull driver circuit is connected with the input end of reference resistance, the input end of reference resistance also is connected with the resistor network control circuit, and the output terminal of reference resistance is the constant current output terminal of digital-control constant-flow source device.
The digital-control constant-flow source device that described band is isolated, the output terminal of reference resistance has the Voltage Feedback line that is connected to the resistor network control circuit.
The digital-control constant-flow source device that described band is isolated, the output terminal of reference resistance is connected with the resistor network control circuit by voltage follower circuit.
Advantage of the present utility model: the utility model is by after the digital calibration zero-bit, and when input voltage was 0, output current was 0; Input voltage is being for just, and output current is just (direction of current is output); Input voltage is for negative, and output current is negative (direction of current is input).
When input voltage was 1V, the electric current of output was about 4.44mA, and whole electric current curve of output becomes 4.44 proportionate relationship with input control voltage, conform to theoretical derivation.
The utility model isolate output, stable, response speed is fast, can realize very high output accuracy, and reliability height, production cost is low.Select by parameter, can form the digital-control constant-flow source of different parameters.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model.
Embodiment
As Fig. 1: the constant current source input circuit comprises: the digital to analog converter module adopts the AD664 chip of AD company, and the output of digital to analog converter module " vout " meets " vin+ " of isolating converter.The output of isolating converter " vout+ " is connected to second-order low-pass filter.
Because isolating converter adopts the modulation and demodulation pattern that signal is isolated, therefore isolate the back output signal and comprise more high frequency noise composition, for guaranteeing the pure of output signal, increase second-order low-pass filter at the isolating converter output terminal.
Second-order low-pass filter output connects the input end of voltage controlled current source circuit.The voltage controlled current source circuit comprises resistor network control circuit, amplifying circuit, push-pull driver circuit, voltage follower circuit and reference resistance etc.
Filtered signal, enter resistor network control circuit and amplifier after, push-pull driver circuit is directly controlled in its output.Push-pull driver circuit is connected with the input end of reference resistance R0, and the output terminal of reference resistance R0 connects voltage follower circuit, and the voltage follow signal back resistor network control circuit of generation participates in the control of output voltage.
The input end of reference resistance has the Voltage Feedback line that is connected to the resistor network control circuit.The output terminal of reference resistance R0 is the constant current output terminal of digital-control constant-flow source device, and RL is connected with load.
In circuit, VCC and GND are the 5V power supply.
The a-quadrant power supply is A+15V, AGND, A-15V; B district power supply is O+15V, OGND, O-15V.
The cardinal principle of the digital-control constant-flow source that the utility model band is isolated is: the output voltage vout of peripheral control unit control DA, vout obtains voltage Vo1 after isolating conversion and second-order low-pass filter, the voltage Vo1 ' of voltage Vo1 linear transformation to the reference resistance R0, the steady current that obtains exporting than last reference resistance R0 by Vo1 ', the electric current of output does not change with the change in resistance of load RL, and the output voltage that produced by digital-to-analog conversion is controlled.
Claims (3)
1. digital-control constant-flow source device with isolation, comprise the voltage controlled current source circuit, it is characterized in that: before the voltage controlled current source circuit, the D/A converter module that connects is successively arranged, isolating converter and second-order low-pass filter, the output of second-order low-pass filter is connected to the resistor network control circuit that the voltage controlled current source circuit is assisted control, the resistor network control circuit is connected to amplifying circuit and push-pull driver circuit successively, push-pull driver circuit is connected with the input end of reference resistance, the input end of reference resistance also is connected with the resistor network control circuit, and the output terminal of reference resistance is the constant current output terminal of digital-control constant-flow source device.
2. the digital-control constant-flow source device that band according to claim 1 is isolated, it is characterized in that: the output terminal of reference resistance has the Voltage Feedback line that is connected to the resistor network control circuit.
3. the digital-control constant-flow source device that band according to claim 1 and 2 is isolated, it is characterized in that: the output terminal of reference resistance is connected with the resistor network control circuit by voltage follower circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201904126U CN201327598Y (en) | 2008-08-21 | 2008-08-21 | Numerical control constant-current source device with separation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201904126U CN201327598Y (en) | 2008-08-21 | 2008-08-21 | Numerical control constant-current source device with separation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201327598Y true CN201327598Y (en) | 2009-10-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201904126U Expired - Fee Related CN201327598Y (en) | 2008-08-21 | 2008-08-21 | Numerical control constant-current source device with separation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201327598Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445506A (en) * | 2018-12-26 | 2019-03-08 | 长春工程学院 | A kind of Portable voltage following-up type constant current source module |
-
2008
- 2008-08-21 CN CNU2008201904126U patent/CN201327598Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445506A (en) * | 2018-12-26 | 2019-03-08 | 长春工程学院 | A kind of Portable voltage following-up type constant current source module |
| CN109445506B (en) * | 2018-12-26 | 2023-09-01 | 长春工程学院 | Portable voltage tracking type constant current source module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HUBEI SANJIANG AEROSPACE HONGFENG CONTROL CO., LTD Free format text: FORMER NAME: STATE HONGFENG MACHINERY FACTORY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: No. 8 Beijing road Hubei 432000 mailbox city of Xiaogan Province Patentee after: Hubei Sanjiang Aerospace Hongfeng Control Co., Ltd. Address before: No. 8 Beijing road Hubei 432000 mailbox city of Xiaogan Province Patentee before: State Hongfeng Machinery Factory |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091014 Termination date: 20130821 |