CN201349198Y - HART modem - Google Patents
HART modem Download PDFInfo
- Publication number
- CN201349198Y CN201349198Y CNU2008201660259U CN200820166025U CN201349198Y CN 201349198 Y CN201349198 Y CN 201349198Y CN U2008201660259 U CNU2008201660259 U CN U2008201660259U CN 200820166025 U CN200820166025 U CN 200820166025U CN 201349198 Y CN201349198 Y CN 201349198Y
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- China
- Prior art keywords
- oscillator
- current control
- control circuit
- demodulator
- hart
- 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
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Abstract
The utility model discloses an HART modem, the oscillator of which comprises a current control circuit. The current control circuit controls the driving capability of a phase inverter in the oscillator to enable the oscillator to adapt to different crystals, so the application range is widened and at the same time power consumption during practical use is reduced. As for a specific crystal, the user can adjust an external resistor to enable the circuit to minimize the power consumption under the condition of being able to start oscillation.
Description
Technical field
The utility model relates to a kind of modulator-demodulator at fieldbus HART communication protocol, relates in particular to modem chips that be packaged into chip structure integrated finished needed all numerals of HART communication and analog module.
Background technology
Along with the development of field bus technique in the Industry Control, one of fieldbus Hart agreement has also obtained very big development and popularization, and becomes the true industrial standard of fieldbus.Core component in Hart communication is the Hart modulator-demodulator.As the intermediate protocol of existing analogue communication system to the transition of pure digi-tal field bus communication system, the Hart communication system has been subjected to a lot of restrictions of existing analogue system, especially the power consumption of whole communication system is subject to the maximum of 4mA, and this requires all necessary design of adopting low-power consumption of each several part in the Hart communication system.In the prior art, modem chip is because the inverter drive ability of oscillator is certain, make oscillator can only be adapted to the crystal of specification among a small circle, if expansion accommodation, at the design inverter is to increase its driving force, therefore cause the accommodation of this modulator-demodulator very narrow, power consumption is bigger simultaneously.
The utility model content
The technical problems to be solved in the utility model provides a kind of accommodation HART modulator-demodulator wide, low in energy consumption.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: this HART modulator-demodulator comprises power module, logic controller, oscillator at least, described power module is connected with logic controller, described logic controller is connected with oscillator, described oscillator includes current control circuit, and the inverter in described current control circuit and the oscillator is connected.
As of the present utility model preferred, described current control circuit comprises operational amplifier and field effect transistor.Be provided with a N ditch enhancement mode field effect transistor and two p ditch enhancement mode field effect transistor in this current control circuit.Operational amplifier is connected with N ditch enhancement mode field effect transistor, and after two p ditch enhancement mode field effect transistor linked together, their respective end was connected with inverter with N ditch enhancement mode field effect transistor respectively, and then constitutes a current control circuit.
As of the present utility model preferred, it is low pressure difference linear voltage regulator that described power module inside is provided with the LDO circuit.This LDO carries out linearity with the operating voltage of chip and is adjusted to 2V, supplies with the inner all digital circuits of modulator-demodulator then, can reduce the power consumption of digital circuit like this, thereby make the low power capabilities of this modulator-demodulator more outstanding.
The utility model adopts technique scheme: the oscillator of this HART modulator-demodulator has comprised a current control circuit, this current control circuit is by the driving force of inverter in the control generator, can allow oscillator adapt to different crystal, accommodation broadens, and also can reduce power consumption in concrete the application simultaneously; And at a certain actual crystal, the user can regulate non-essential resistance makes circuit consume lowest power consumption under the situation of starting of oscillation.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further specified.
Fig. 1 is the user mode reference diagram of the oscillator of a kind of HART modulator-demodulator of the utility model.
Embodiment
The utility model HART modulator-demodulator has comprised power module, logic controller, oscillator.Power module is connected with logic controller, and logic controller is connected with oscillator.
Being provided with the LDO circuit in power module inside is low pressure difference linear voltage regulator.As shown in Figure 1, oscillator includes current control circuit and inverter, and this current control circuit comprises operational amplifier and field effect transistor, is provided with a N ditch enhancement mode field effect transistor and two p ditch enhancement mode field effect transistor in this current control circuit.The output of operational amplifier is connected with the grid of N ditch enhancement mode field effect transistor, the grid of two p ditch enhancement mode field effect transistor links to each other, the common operating voltage that inserts modulator-demodulator of drain electrode, the source electrode of one of them p ditch enhancement mode field effect transistor is connected with the drain electrode of N ditch enhancement mode field effect transistor, and the source electrode of another p ditch enhancement mode field effect transistor is connected with inverter.The inverting input of the source electrode of N ditch enhancement mode field effect transistor and operational amplifier is connected on the off chip resistor jointly during use, and the in-phase input end of operational amplifier connects reference voltage of access simultaneously.This current control circuit can allow oscillator adapt to different crystal by the driving force of inverter in the control generator, and accommodation broadens, and also can reduce power consumption in concrete the application simultaneously; And at a certain actual crystal, the user can regulate non-essential resistance makes circuit consume lowest power consumption under the situation of starting of oscillation.
Claims (3)
1, a kind of HART modulator-demodulator, which comprises at least power module, logic controller, oscillator, described power module is connected with logic controller, described logic controller is connected with oscillator, it is characterized in that: described oscillator includes current control circuit, and the inverter in described current control circuit and the oscillator is connected.
2, according to the described HART modulator-demodulator of claim 1, it is characterized in that: described current control circuit comprises operational amplifier and field effect transistor.
3, according to the described HART modulator-demodulator of claim 1, it is characterized in that: it is low pressure difference linear voltage regulator that described power module inside is provided with the LDO circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201660259U CN201349198Y (en) | 2008-10-20 | 2008-10-20 | HART modem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201660259U CN201349198Y (en) | 2008-10-20 | 2008-10-20 | HART modem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201349198Y true CN201349198Y (en) | 2009-11-18 |
Family
ID=41368661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201660259U Expired - Lifetime CN201349198Y (en) | 2008-10-20 | 2008-10-20 | HART modem |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201349198Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425702A (en) * | 2011-11-11 | 2012-04-25 | 中环天仪股份有限公司 | HART (highway addressable remote transducer) transmission circuit applying to valve positioner |
| CN105371884A (en) * | 2015-09-11 | 2016-03-02 | 重庆川仪自动化股份有限公司 | Circuit and system for reading parameters of HART instrument through RS232 |
-
2008
- 2008-10-20 CN CNU2008201660259U patent/CN201349198Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425702A (en) * | 2011-11-11 | 2012-04-25 | 中环天仪股份有限公司 | HART (highway addressable remote transducer) transmission circuit applying to valve positioner |
| CN102425702B (en) * | 2011-11-11 | 2013-05-01 | 中环天仪股份有限公司 | HART (highway addressable remote transducer) transmission circuit applying to valve positioner |
| CN105371884A (en) * | 2015-09-11 | 2016-03-02 | 重庆川仪自动化股份有限公司 | Circuit and system for reading parameters of HART instrument through RS232 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Chen Min Document name: Notification of patent rights granted to utility models and formalities for registration |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091118 |
|
| CX01 | Expiry of patent term |