CN110798173A - Fieldbus power regulator circuit - Google Patents
Fieldbus power regulator circuit Download PDFInfo
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- CN110798173A CN110798173A CN201910993934.2A CN201910993934A CN110798173A CN 110798173 A CN110798173 A CN 110798173A CN 201910993934 A CN201910993934 A CN 201910993934A CN 110798173 A CN110798173 A CN 110798173A
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- resistor
- power supply
- operational amplifier
- capacitor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/40—Impedance converters
- H03H11/42—Gyrators
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Abstract
The invention provides a field bus power supply regulator circuit, comprising: a first power supply and an operational amplifier; the positive electrode of the first power supply is externally connected with an external power supply; the emitting electrode of the triode is externally connected with the negative electrode of the first power supply; one end of the first resistor is simultaneously connected to the collector of the triode and one input end of the operational amplifier; the capacitance adjusting module is provided with a first input end, a second input end and an output end for externally connecting a bus; the first capacitance adjusting module is used for increasing inductance under low-frequency signals; the first input end is externally connected with the other end of the first resistor; one end of the second resistor is connected to the negative electrode of the first power supply, and the other end of the second resistor is simultaneously connected to the other input end and the second output end of the operational amplifier; the output end of the operational amplifier is connected to the base electrode of the triode. The invention makes the communication signal jitter smaller and the gain flatness in the signal bandwidth better.
Description
Technical Field
The invention relates to the field of automatic control systems, in particular to a field bus power supply regulator circuit.
Background
Currently, in the field of industrial automation, a control system is a core device for realizing industrial automation, and a field bus control system FCS is one of them. In the field bus control system, an FF field bus and a Profibus-PA are two main field bus systems in the FCS market, and account for more than 95 percent. The FF fieldbus and Profibus-PA require the same physical layer consistency for signal transmission.
In such fieldbus systems, the formation of a basic H1 network segment requires at least three types of auxiliary devices: power supply, regulator, terminator. Typical values for the termination are 100 Ω and 1uF, across the bus, one placed near the end and the other at the far end, controlling the impedance on the bus to 50 Ω. The interface circuit (signal generating circuit) will modulate a 31.25K AC current signal with a magnitude of + -10 mA on the bus, and the AC current signal is converted into an AC voltage with an amplitude of 1V through the conversion of the terminator on the bus. This results in an alternating voltage signal of frequency 31.25K and amplitude 1V being transmitted over the bus.
Not only is the transmission of signals carried out on the bus, but the power required by the field devices is supplied, so that a nominal 24VDC power must be supplied to one end of the bus. However, a common dc power supply cannot be directly connected to the bus because the ac impedance of the dc power supply is very small, and if the dc power supply is directly connected to the bus, most of the ac current modulated on the bus flows to the power supply with the smaller ac impedance, rather than the terminator. The direct current power supply absorbs the field bus signal in order to maintain a constant voltage, and the bus cannot obtain a required alternating voltage, so that the transmission of the bus signal cannot be realized.
In order to avoid the situation, an FF regulator must be arranged between the power distribution power supply and the H1 network segment to regulate the direct current power supply to prevent the communication signals from entering the stabilized power supply, and the FF regulator regulates the power supply presenting low impedance to the field bus signals to high impedance, so that the aim of preventing the alternating current signals of the field bus from entering the power supply is fulfilled. Currently common regulators are passive regulators and active regulators.
The basic idea of the active regulator is to use an active circuit to simulate an inductor and a resistor, and the existing solution is implemented by using a Gyrator, and the circuit topology is shown in fig. 1. In the figure, U1 is an operational amplifier, Q1 is a transistor, R1 and R2 are resistors, C1 is a capacitor, and Vref (reference voltage) is a constant level referenced to the negative terminal of the power supply. The circuit of the combination of these several devices satisfies deep negative feedback, where the voltage drop across Q1 is the same as the voltage of Vref.
Assuming that the voltage at the left end of the resistor R1 is U, the current formed at this node is I. Wherein, the current on R1 is I1, and the current on C1 is I2, then:
U＝I1*R1+I1*R2-----------b)
from formula a) and formula b) the following relationship can then be obtained
The inductance of the inductor is:
XL＝2πfL-----------d)
as can be seen from the above equation, the inductance L increases with a constant frequency f. This results in improved measures: the inductance L under the low frequency signal is increased.
When R1 × C1 × w < <1, it can be considered that L — R1 × R2 × C1. That is, the ac path of the circuit corresponds to a series connection of a resistor R1 and an inductor L (R1R 2C 1). The impedance parameter control is not ideal, and the impedance of the bus to high and low frequency signals is not consistent (the high frequency impedance is normal, and the low frequency impedance is too small). As shown in fig. 1, for the impedance of the regulator: when the signal is high frequency, the inductor plays a main role, the inductive reactance contributes to the impedance of the regulator to the maximum extent, the impedance of the regulator is also large enough, and the high frequency impedance is normal; when the signal is at a low frequency, the inductive reactance contribution is small, and the resistive impedance contribution is large, and if the impedance of the regulator is too small at this time, the inductive reactance or impedance needs to be increased. However, the characteristic of the regulator determines that the resistance cannot be increased at will, and therefore the low-frequency impedance of the regulator can only be increased by increasing the inductive reactance. Finally, the existing active regulator solution has a large difference in performance from the ideal regulator, and compared with the ideal regulator, the communication signal jitter (jitter refers to the deviation of the signal pulse width from the standard value) is larger, and the signal gain flatness is poorer (the transmission amplitude is basically consistent within the signal range of 3KHz to 39KHz on the bus).
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a field bus power supply regulator circuit, which solves the defect that the high-frequency impedance of the existing active regulator is normal, but the low-frequency impedance is too small.
(II) technical scheme
In order to solve the above technical problem, the present invention provides a fieldbus power regulator circuit, including: a first power supply; the positive electrode of the first power supply is externally connected with an external power supply;
an operational amplifier;
a triode; the emitting electrode of the triode is externally connected with the negative electrode of a first power supply;
a first resistor; one end of the first resistor is connected to the collector of the triode and one input end of the operational amplifier at the same time;
the capacitance adjusting module is provided with a first input end, a second input end and an output end for externally connecting a bus; the first capacitance adjusting module is used for increasing inductance under low-frequency signals; the first input end is externally connected with the other end of the first resistor; and
a second resistor; one end of the second resistor is connected to the negative electrode of the first power supply, and the other end of the second resistor is simultaneously connected to the other input end and the second output end of the operational amplifier; the output end of the operational amplifier is connected to the base electrode of the triode. The inductance L of the inductor under the low-frequency signal can be effectively increased by adopting the capacitance adjusting module, so that the low-frequency impedance of the adjuster is increased; finally, the communication signal jitter is small, and the gain flatness in the signal bandwidth is good.
Preferably, the electricityThe capacitance adjusting module comprises a first capacitance branch circuit and a second capacitance branch circuit which are connected in parallel, the first capacitance branch circuit comprises a first capacitor, and the second capacitance branch circuit comprises a second capacitor and a third resistor which are sequentially connected in series; the capacitance of the second capacitor is larger than that of the first capacitor. A resistor R3 and a capacitor C2 are connected in parallel to a capacitor C1, and C2 is more than C1. The C1, the C2 and the R3 form a new circuit structure, and the capacitance values responded by the circuit structure to different frequencies are different, so that the inductance L of the regulator at different frequencies can be changed. In FIG. 2, R3 > X when the signal is high frequencyC1Therefore I2<<I1, the current mostly flows through the capacitor C1, the main effect in the loop is C1, and at this time, the inductance L1 ≈ R1 ≈ R2 ≈ C1; but when the signal is low frequency, XC1＞XC2> R3, therefore I2>I1, the current mostly flows through R3 and C2, the loop plays a main role of C2, when L2 is approximately equal to R1, R2 is approximately equal to C2, L2 is larger than L1, namely the low-frequency inductance is increased. The circuit structure of the invention can effectively increase the inductance L of the inductor under low-frequency signals, thereby increasing the low-frequency impedance of the regulator.
Preferably, one end of the second capacitor is connected to the third resistor, and the other end of the second capacitor is simultaneously connected to the second resistor, the inverting input terminal of the operational amplifier, and the first capacitor.
Preferably, one end of the first capacitor is connected to the first resistor, the third resistor and the output bus at the same time, and the other end of the first capacitor is connected to the second resistor and the inverting input terminal of the operational amplifier at the same time.
Preferably, the fieldbus power supply regulator circuit further comprises a second power supply, one end of the second power supply is connected to the emitter of the triode, and the other end of the second power supply is connected to one end of the anode of the second resistor.
Preferably, the triode is of an NPN type.
Preferably, the operational amplifier is an analog operational amplifier.
(III) advantageous effects
The invention provides a field bus power supply regulator circuit, which has the following advantages:
1. the inductance L of the inductor under the low-frequency signal can be effectively increased by adopting the capacitance adjusting module, so that the low-frequency impedance of the adjuster is increased; finally, the communication signal jitter is small, and the gain flatness in the signal bandwidth is good.
Drawings
FIG. 1 is a block diagram of a topology of a prior art fieldbus power regulator circuit;
fig. 2 is a topology diagram of embodiment 1 of the fieldbus power regulator circuit of the present invention.
1. The circuit comprises a first power supply, a second power supply, a third power supply, a fourth power supply, a fifth power supply, a sixth power supply, a fifth power supply, a sixth power supply, a fourth power supply, a fifth power supply, a sixth power.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be mechanically coupled, directly coupled, or indirectly coupled through an intervening agent. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1 and fig. 2, the present invention provides a fieldbus power supply regulator circuit, which includes: the device comprises a first power supply 1, a second power supply 2, an operational amplifier 3, an NPN type triode 4, a first resistor 5, a second resistor 6 and a capacitance adjusting module 7; wherein, the operational amplifier adopts an analog operational amplifier.
The positive electrode of the first power supply is externally connected with an external power supply; the emitting electrode of the triode is externally connected with the negative electrode of a first power supply; one end of the first resistor is connected to the collector of the triode and one input end of the operational amplifier at the same time; one end of the second power supply is connected to the emitting electrode of the triode, and the other end of the second power supply is connected to one end of the anode of the second resistor.
The capacitance adjusting module is provided with a first input end 15, a second input end 8 and an output end 9 for an external bus; the first input end is externally connected with the other end of the first resistor; the capacitance adjusting module comprises a first capacitance branch 10 and a second capacitance branch 11 which are connected in parallel, the first capacitance branch comprises a first capacitor 12, and the second capacitance branch comprises a second capacitor 13 and a third resistor 14 which are sequentially connected in series; the capacitance of the second capacitor is larger than that of the first capacitor. One end of the second capacitor is connected to the third resistor, and the other end of the second capacitor is simultaneously connected to the second resistor, the inverting input end of the operational amplifier and the first capacitor.
One end of the second resistor is connected to the negative electrode of the first power supply, and the other end of the second resistor is simultaneously connected to the other input end and the second output end of the operational amplifier; the output end of the operational amplifier is connected to the base electrode of the triode. The inductance L of the inductor under the low-frequency signal can be effectively increased by adopting the capacitance adjusting module, so that the low-frequency impedance of the adjuster is increased; finally, the communication signal jitter is small, and the gain flatness in the signal bandwidth is good. One end of the first capacitor is connected to the first resistor, the third resistor and the output bus at the same time, and the other end of the first capacitor is connected to the second resistor and the reverse input end of the operational amplifier at the same time.
In the implementation of the embodiment, a resistor R3 and a capacitor C2 are connected in parallel to the capacitor C1, where C2 > C1. The C1, C2 and R3 form a new circuit structure, the capacitance values responded by the circuit structure to different frequencies are different, and therefore the inductance L of the regulator at different frequencies can be changed. When the signal is high frequency, R3 > XC1Therefore I2<<I1, the current mostly flows through the capacitor C1, the main effect in the loop is C1, and at this time, the inductance L1 ≈ R1 ≈ R2 ≈ C1; but when the signal is low frequency, XC1＞XC2> R3, therefore I2>I1, the current mostly flows through R3 and C2, the loop plays a main role of C2, when L2 is approximately equal to R1, R2 is approximately equal to C2, L2 is larger than L1, namely the low-frequency inductance is increased.
The above embodiments are only used for illustrating the invention, and the structure, connection mode and the like of each component can be changed, and all equivalent changes and modifications based on the technical scheme of the invention should not be excluded from the protection scope of the invention.
Claims (7)
1. A fieldbus power regulator circuit, comprising:
a first power supply; the positive electrode of the first power supply is externally connected with an external power supply;
an operational amplifier;
a triode; the emitting electrode of the triode is externally connected with the negative electrode of a first power supply;
a first resistor; one end of the first resistor is connected to the collector of the triode and one input end of the operational amplifier at the same time;
the capacitance adjusting module is provided with a first input end, a second input end and an output end for externally connecting a bus; the first capacitance adjusting module is used for increasing inductance under low-frequency signals; the first input end is externally connected with the other end of the first resistor; and
a second resistor; one end of the second resistor is connected to the negative electrode of the first power supply, and the other end of the second resistor is simultaneously connected to the other input end and the second output end of the operational amplifier; the output end of the operational amplifier is connected to the base electrode of the triode.
2. The fieldbus power regulator circuit of claim 1, wherein the capacitance adjustment module comprises a first capacitive branch comprising a first capacitor and a second capacitive branch comprising a second capacitor and a third resistor connected in series; the capacitance of the second capacitor is larger than that of the first capacitor.
3. The fieldbus power regulator circuit of claim 2, wherein the second capacitor is connected at one end to the third resistor and at the other end to the second resistor, the inverting input of the operational amplifier and the first capacitor.
4. The fieldbus power regulator circuit of claim 3, wherein the first capacitor is connected at one end to the first resistor, the third resistor and the output bus, and at the other end to the second resistor and the inverting input of the operational amplifier.
5. The fieldbus power regulator circuit of claim 1, 2, 3 or 4 further comprising a second power supply connected at one end to the emitter of the transistor and at the other end to the positive terminal of the second resistor.
6. The fieldbus power regulator circuit of claim 1, 2, 3 or 4, wherein the transistor is of NPN type.
7. The fieldbus power regulator circuit of claim 1, 2, 3 or 4, wherein the operational amplifier is an analog operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993934.2A CN110798173A (en) | 2019-10-18 | 2019-10-18 | Fieldbus power regulator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993934.2A CN110798173A (en) | 2019-10-18 | 2019-10-18 | Fieldbus power regulator circuit |
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| CN110798173A true CN110798173A (en) | 2020-02-14 |
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| CN201910993934.2A Pending CN110798173A (en) | 2019-10-18 | 2019-10-18 | Fieldbus power regulator circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045901A (en) * | 1990-05-19 | 1990-10-03 | 石油地球物理勘探局装备研究所 | Novel impedance transformer |
| JPH09294053A (en) * | 1996-04-26 | 1997-11-11 | Sanyo Electric Co Ltd | Capacitive element and low pass filter |
| US20120161729A1 (en) * | 2010-12-22 | 2012-06-28 | Hon Hai Precision Industry Co., Ltd. | Buck converter |
| CN206077218U (en) * | 2016-07-06 | 2017-04-05 | 中国东方电气集团有限公司 | A kind of three-phase PWM current transformer output DUDT wave filter based on auxiliary capacitor branch road |
| CN108334183A (en) * | 2018-01-26 | 2018-07-27 | 山东超越数控电子股份有限公司 | A kind of supply voltage automatic adjusument circuit |
-
2019
- 2019-10-18 CN CN201910993934.2A patent/CN110798173A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045901A (en) * | 1990-05-19 | 1990-10-03 | 石油地球物理勘探局装备研究所 | Novel impedance transformer |
| JPH09294053A (en) * | 1996-04-26 | 1997-11-11 | Sanyo Electric Co Ltd | Capacitive element and low pass filter |
| US20120161729A1 (en) * | 2010-12-22 | 2012-06-28 | Hon Hai Precision Industry Co., Ltd. | Buck converter |
| CN206077218U (en) * | 2016-07-06 | 2017-04-05 | 中国东方电气集团有限公司 | A kind of three-phase PWM current transformer output DUDT wave filter based on auxiliary capacitor branch road |
| CN108334183A (en) * | 2018-01-26 | 2018-07-27 | 山东超越数控电子股份有限公司 | A kind of supply voltage automatic adjusument circuit |
Non-Patent Citations (1)
| Title |
|---|
| 吴新全等: ""FF总线有源调节器电路设计及抗干扰研究"" * |
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