CN103023340A - Power circuit and method for increasing load capacity of two-wire system instrument - Google Patents
Power circuit and method for increasing load capacity of two-wire system instrument Download PDFInfo
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- CN103023340A CN103023340A CN2012104901493A CN201210490149A CN103023340A CN 103023340 A CN103023340 A CN 103023340A CN 2012104901493 A CN2012104901493 A CN 2012104901493A CN 201210490149 A CN201210490149 A CN 201210490149A CN 103023340 A CN103023340 A CN 103023340A
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Abstract
The invention relates to a power circuit and a method for increasing the load capacity of a two-wire system instrument. The power circuit is characterized in that an oscillating circuit comprising an oscillation transformer, triodes Q2 and Q3, and resistors R2 and R3 is connected with a loop of a power supply unit in series; a power source is switched on; due to the existence of a voltage stabilizing diode Z1, the power circuit has a working voltage and begins to continuously oscillate, an alternating voltage is generated at a secondary of the oscillation transformer and is rectified to turn into an unstable direct current through a rectifier bridge formed by rapid low dropout rectifier diodes D1-D4, the unstable direct current turns into a stable direct-current voltage through the filtration of a capacitor C1 and a voltage stabilizer IC1, and an equivalent load RX of a sensor is electrified through a low dropout diode D5; as a voltage obtained through the isolation of a primary and the secondary of the oscillation transformer can be connected with the voltage of the power supply unit in parallel for use, the input power of the equivalent load RX of the sensor is increased on the premise that electric currents of the loop are not added, and therefore, the power circuit can be used for increasing the load capacity of the whole instrument; and the power circuit has the effect of ensuring the accuracy of instrument measurement.
Description
Technical field
The present invention relates to a kind of power circuit and method that improves two-wire system instrument load capacity in instrument and meter for automation field.
Background technology
Use the mode of connection of two-wire system very many in the current instrument and meter for automation, its operation principle is that control system provides power supply by two power lines for instrument, instrument changes between 4mA-20mA according to the circuit of the big or small control loop of sensor measurement physical quantity, the power supply of whole like this instrument is restricted, especially when loop current is 4mA, the power of outside input is little, load capacity is poor, directly the result is that its power unit load capacity is low, can't work when the Sensor section power consumption is larger.
Summary of the invention
Deficiency in view of prior art exists the invention provides a kind of power circuit and method that improves two-wire system instrument load capacity, can well solve the existing problem of current two line gauge sensor power supply circuits.
The present invention to achieve these goals, the technical scheme that adopts is: a kind of power circuit that improves two-wire system instrument load capacity, comprise power subsystem and transducer equivalence load RX, it is characterized in that: also comprise oscillation transformer TRAN, triode Q2, triode Q3, voltage stabilizing didoe Z1, low voltage difference fast recovery rectifier diode D1-D4, pressurizer IC1, low voltage difference diode D5, low voltage difference diode D6,1 pin of described oscillation transformer TRAN primary coil connects the collector electrode of triode Q2, one end of resistance R 2,3 pin of oscillation transformer TRAN primary coil connect the collector electrode of triode Q3, one end of resistance R 3, the base stage of another termination triode Q2 of resistance R 2, the base stage of another termination triode Q3 of resistance R 3, triode Q2, the emitter of triode Q3 links to each other and connects the positive pole of voltage stabilizing didoe Z1 and the drain electrode of described power subsystem N channel depletion type field effect transistor, 3 pin of oscillation transformer TRAN primary coil meet negative pole and the external dc power V+ of voltage stabilizing didoe Z1,4 pin of oscillation transformer TRAN secondary coil and 5 pin connect the ac input end of the rectifier bridge of low voltage difference fast recovery rectifier diode D1-D4 composition, the dc output end of the rectifier bridge that low voltage difference fast recovery rectifier diode D1-D4 forms is in parallel with capacitor C 1,1 pin of pressurizer IC1 connects the negative pole of capacitor C 1, an end and the ground of transducer equivalence load RX, 2 pin of pressurizer IC1 connect the positive pole of capacitor C 1, and 3 pin of pressurizer IC1 connect the other end of transducer equivalence load RX by low voltage difference diode D5.
A kind of power circuit method that improves two-wire system instrument load capacity, it is characterized in that: having connected in the loop of power subsystem comprises oscillation transformer TRAN, triode Q2, triode Q3, resistance R 2, the oscillating circuit that resistance R 3 forms, plugged, because the existence of voltage stabilizing didoe Z1, circuit has possessed operating voltage, beginning continuous oscillation, at the secondary generation alternating voltage of oscillation transformer, become unstable direct current through the rectifier bridge rectification that low voltage difference fast recovery rectifier diode D1-D4 forms, through capacitor C 1 filtering, pressurizer IC1, become stable DC voltage, process low voltage difference diode D5 is transducer equivalence load RX power supply, because oscillation transformer TRAN's is elementary, the voltage that secondary isolation obtains, can use with the voltage parallel of power subsystem, under the prerequisite that does not increase loop current, improve the input power of transducer equivalence load RX, become the power circuit that whole instrument improves load capacity.
The invention has the beneficial effects as follows: whole instrument is increased by the electric energy that the loop obtains, and the stability of instrument can well be provided, the accuracy of effective guarantee instrument measurement and accuracy, because the increase of Sensor section power supply capacity, antijamming capability strengthens.
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, a kind of power circuit that improves two-wire system instrument load capacity, comprise power subsystem and transducer equivalence load RX, also comprise oscillation transformer TRAN, triode Q2, triode Q3, voltage stabilizing didoe Z1, low voltage difference fast recovery rectifier diode D1-D4, pressurizer IC1, low voltage difference diode D5, low voltage difference diode D6,1 pin of oscillation transformer TRAN primary coil connects the collector electrode of triode Q2, one end of resistance R 2,3 pin of switch transformer TRAN primary coil connect the collector electrode of triode Q3, one end of resistance R 3, the base stage of another termination triode Q2 of resistance R 2, the base stage of another termination triode Q3 of resistance R 3, triode Q2, the emitter of triode Q3 links to each other and connects the positive pole of voltage stabilizing didoe Z1 and the drain electrode of described power subsystem N channel depletion type field effect transistor, 3 pin of oscillation transformer TRAN primary coil meet negative pole and the external dc power V+ of voltage stabilizing didoe Z1,4 pin of switch transformer TRAN secondary coil and 5 pin connect the ac input end of the rectifier bridge of low voltage difference fast recovery rectifier diode D1-D4 composition, the dc output end of the rectifier bridge that low voltage difference fast recovery rectifier diode D1-D4 forms is in parallel with capacitor C 1,1 pin of pressurizer IC1 connects the negative pole of capacitor C 1, an end and the ground of transducer equivalence load RX, 2 pin of pressurizer IC1 connect the positive pole of capacitor C 1, and 3 pin of pressurizer IC1 connect the other end of transducer equivalence load RX by low voltage difference diode D5.
A kind of power circuit method that improves two-wire system instrument load capacity, in the loop of power subsystem, connected and comprised oscillation transformer TRAN, triode Q2, triode Q3, resistance R 2, the oscillating circuit that resistance R 3 forms, plugged, because the existence of voltage stabilizing didoe Z1, circuit has possessed operating voltage, beginning continuous oscillation, at the secondary generation alternating voltage of oscillation transformer, become unstable direct current through the rectifier bridge rectification that low voltage difference fast recovery rectifier diode D1-D4 forms, through capacitor C 1 filtering, pressurizer IC1, become stable DC voltage, process low voltage difference diode D5 is transducer equivalence load RX power supply, because oscillation transformer TRAN's is elementary, the voltage that secondary isolation obtains, can use with the voltage parallel of power subsystem, under the prerequisite of the electric current that does not increase the loop, improve the input power of transducer equivalence load RX, become the power circuit that whole instrument improves load capacity.
Foregoing circuit V+ is connected external dc power with V-, and voltage range can 24V-36V; The part of dotted line be present two-wire system instrument typical circuit be power subsystem, U1 is that the CPU of two-wire system instrument is responsible for image data, the electric current of regulating current loop according to the size of collection signal control current controller U2 changes between 4mA-20mA.Existing power subsystem connected mode, VDD is 3.3V, and the operating current of 4mA can be provided for whole instrument, and wherein a part is by U1 and auxiliary circuit consumption thereof, and a part provides electric current by diode D6 for transducer equivalence load.
Claims (2)
1. power circuit that improves two-wire system instrument load capacity, comprise power subsystem and transducer equivalence load RX, it is characterized in that: also comprise oscillation transformer TRAN, triode Q2, triode Q3, voltage stabilizing didoe Z1, low voltage difference fast recovery rectifier diode D1-D4, pressurizer IC1, low voltage difference diode D5, low voltage difference diode D6,1 pin of described oscillation transformer TRAN primary coil connects the collector electrode of triode Q2, one end of resistance R 2,3 pin of oscillation transformer TRAN primary coil connect the collector electrode of triode Q3, one end of resistance R 3, the base stage of another termination triode Q2 of resistance R 2, the base stage of another termination triode Q3 of resistance R 3, triode Q2, the emitter of triode Q3 links to each other and connects the positive pole of voltage stabilizing didoe Z1 and the drain electrode of described power subsystem N channel depletion type field effect transistor Q1,3 pin of oscillation transformer TRAN primary coil meet negative pole and the external dc power V+ of voltage stabilizing didoe Z1,4 pin of oscillation transformer TRAN secondary coil and 5 pin connect the ac input end of the rectifier bridge of low voltage difference fast recovery rectifier diode D1-D4 composition, the dc output end of the rectifier bridge that low voltage difference fast recovery rectifier diode D1-D4 forms is in parallel with capacitor C 1,1 pin of pressurizer IC1 connects the negative pole of capacitor C 1, an end and the ground of transducer equivalence load RX, 2 pin of pressurizer IC1 connect the positive pole of capacitor C 1, and 3 pin of pressurizer IC1 connect the other end of transducer equivalence load RX by low voltage difference diode D5.
2. power circuit method that improves two-wire system instrument load capacity, it is characterized in that: having connected in the loop of power subsystem comprises oscillation transformer TRAN, triode Q2, triode Q3, resistance R 2, the oscillating circuit that resistance R 3 forms, plugged, because the existence of voltage stabilizing didoe Z1, circuit has possessed operating voltage, beginning continuous oscillation, at the secondary generation alternating voltage of oscillation transformer, become unstable direct current through the rectifier bridge rectification that low voltage difference fast recovery rectifier diode D1-D4 forms, through capacitor C 1 filtering, pressurizer IC1, become stable DC voltage, process low voltage difference diode D5 is transducer equivalence load RX power supply, because oscillation transformer TRAN's is elementary, the voltage that secondary isolation obtains, can use with the voltage parallel of power subsystem, under the prerequisite that does not increase the current supply circuit electric current, improve the input power of transducer equivalence load RX, become the power circuit that whole instrument improves load capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104901493A CN103023340A (en) | 2012-11-27 | 2012-11-27 | Power circuit and method for increasing load capacity of two-wire system instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104901493A CN103023340A (en) | 2012-11-27 | 2012-11-27 | Power circuit and method for increasing load capacity of two-wire system instrument |
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| CN103023340A true CN103023340A (en) | 2013-04-03 |
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| CN2012104901493A Pending CN103023340A (en) | 2012-11-27 | 2012-11-27 | Power circuit and method for increasing load capacity of two-wire system instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109451627A (en) * | 2018-12-21 | 2019-03-08 | 中环天仪股份有限公司 | A kind of constant-current circuit and implementation method with working status indication |
| CN110838853A (en) * | 2019-11-08 | 2020-02-25 | 深圳麦克维尔空调有限公司 | Two-wire system communication circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0025077A1 (en) * | 1979-09-06 | 1981-03-18 | Vibro-Meter Sa | A two-wire remote measuring system |
| CN2268332Y (en) * | 1996-02-14 | 1997-11-19 | 李世灿 | High-efficiency reliable emergency fluorescent lamp |
| CN2847228Y (en) * | 2005-11-04 | 2006-12-13 | 上海宇软电子设备有限公司 | Intelligent transducer isolation circuit for two-wire system |
| CN202471808U (en) * | 2012-02-26 | 2012-10-03 | 厦门市爱维达电子有限公司 | Electrically-isolated voltage sampling module circuit |
| CN202957750U (en) * | 2012-11-27 | 2013-05-29 | 中环天仪股份有限公司 | Power supply circuit for improving load capacity of two-wire meter |
-
2012
- 2012-11-27 CN CN2012104901493A patent/CN103023340A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0025077A1 (en) * | 1979-09-06 | 1981-03-18 | Vibro-Meter Sa | A two-wire remote measuring system |
| CN2268332Y (en) * | 1996-02-14 | 1997-11-19 | 李世灿 | High-efficiency reliable emergency fluorescent lamp |
| CN2847228Y (en) * | 2005-11-04 | 2006-12-13 | 上海宇软电子设备有限公司 | Intelligent transducer isolation circuit for two-wire system |
| CN202471808U (en) * | 2012-02-26 | 2012-10-03 | 厦门市爱维达电子有限公司 | Electrically-isolated voltage sampling module circuit |
| CN202957750U (en) * | 2012-11-27 | 2013-05-29 | 中环天仪股份有限公司 | Power supply circuit for improving load capacity of two-wire meter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109451627A (en) * | 2018-12-21 | 2019-03-08 | 中环天仪股份有限公司 | A kind of constant-current circuit and implementation method with working status indication |
| CN110838853A (en) * | 2019-11-08 | 2020-02-25 | 深圳麦克维尔空调有限公司 | Two-wire system communication circuit |
| CN110838853B (en) * | 2019-11-08 | 2022-05-13 | 深圳麦克维尔空调有限公司 | Two-wire system communication circuit |
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Application publication date: 20130403 |