CN111293881A - Control circuit - Google Patents

Control circuit Download PDF

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Publication number
CN111293881A
CN111293881A CN202010087757.4A CN202010087757A CN111293881A CN 111293881 A CN111293881 A CN 111293881A CN 202010087757 A CN202010087757 A CN 202010087757A CN 111293881 A CN111293881 A CN 111293881A
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Prior art keywords
unit
resistance
control circuit
operational amplifier
resistance unit
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CN202010087757.4A
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Chinese (zh)
Inventor
付士根
李全明
张红
王庆
陈友良
梁玉霞
覃璇
李振涛
刘岩
赵军
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China Academy of Safety Science and Technology CASST
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China Academy of Safety Science and Technology CASST
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Priority to CN202010087757.4A priority Critical patent/CN111293881A/en
Publication of CN111293881A publication Critical patent/CN111293881A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a control circuit. The control circuit comprises an operational amplifier, a switch unit, a first resistance unit, a second resistance unit and a power supply; the non-inverting input end of the operational amplifier is used for inputting control voltage and detection signals, the inverting input end of the operational amplifier is respectively connected with one end of the first resistance unit and one end of the second resistance unit, the other end of the first resistance unit is connected with a power supply, the power supply is used for providing preset voltage, and the output end of the operational amplifier is connected with the signal control end of the switch unit. The invention solves the technical problems of complex structure and large power consumption of the current control circuit in the related technology.

Description

Control circuit
Technical Field
The invention relates to the field of circuit control, in particular to a control circuit.
Background
The current voltage control current is designed based on an operational amplifier, and in order to realize accurate voltage control current, double-end control is mostly adopted so as to achieve the effect that the controllable current starts from zero. Such a design results in a complex circuit structure and increased power consumption of the circuit. If the circuit structure is simplified and the power consumption of the circuit is reduced, single-ended control can be adopted, and the voltage of the output end of the operational amplifier needs to be zero, so that a switch controlled by the output end of the operational amplifier is completely turned off and the current is cut off. However, the output end of the amplifier is affected by the offset voltage of the operational amplifier and the offset voltage temperature drift, and the output is difficult to be zero. Meanwhile, the signal accessed by the input end of the operational amplifier is a non-zero voltage control signal, so that the output end of the operational amplifier is not zero, the switch cannot be in a complete turn-off state, current still flows through the switch tube, and the current is not cut off.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a control circuit, which at least solves the technical problems of complex structure and high power consumption of a current control circuit in the related art.
According to an aspect of an embodiment of the present invention, there is provided a control circuit including an operational amplifier, a switching unit, a first resistance unit, a second resistance unit, and a power supply; the non-inverting input end of the operational amplifier is used for inputting control voltage and detection signals, the inverting input end of the operational amplifier is respectively connected with one end of the first resistance unit and one end of the second resistance unit, the other end of the first resistance unit is connected with the power supply, the power supply is used for providing preset voltage, and the output end of the operational amplifier is connected with the signal control end of the switch unit.
Optionally, the control circuit further includes a sampling unit, wherein an output end of the switch unit is connected to the other end of the second resistance unit, one end of the sampling unit is connected, and the other end of the sampling unit is grounded.
Optionally, a resistance value of the sampling unit is smaller than a resistance value of the first resistance unit and a resistance value of the second resistance unit.
Optionally, the sampling unit comprises a sampling resistor.
Optionally, the control circuit further comprises a micro control processor, and the micro control processor is connected with the non-inverting input terminal of the operational amplifier.
Optionally, the switch unit further comprises a load, and one end of the load is connected with the input end of the switch unit.
Optionally, the predetermined voltage is 5V.
Optionally, a ratio between the first resistance unit and the second resistance unit is
Figure BDA0002382390340000021
Optionally, the switching unit comprises a switching tube.
Optionally, the first resistance unit includes a trimming resistance.
Optionally, the second resistance unit comprises a feedback resistance.
In an embodiment of the present invention, the control circuit includes an operational amplifier, a switching unit, a first resistance unit, a second resistance unit, and a power supply; the non-inverting input end of the operational amplifier is used for inputting control voltage and detection signals, the inverting input end of the operational amplifier is connected with one end of the first resistance unit and one end of the second resistance unit respectively, the other end of the first resistance unit is connected with the power supply, the power supply is used for providing preset voltage, the output end of the operational amplifier is connected with the signal control end of the switch unit, the feedback of the operational amplifier is adjusted by matching the operational amplifier with the second resistance unit, the purpose of adjusting the output current of the switch tube is achieved, meanwhile, the power supply with preset voltage is added to the inverting input end of the operational amplifier, the first resistance unit is added, and the voltage ratio is adjusted, so that the technical effect of accurately adjusting and controlling the current from zero is achieved, and the technical effects that the current control circuit in the related technology is complex in structure, low in, The technical problem of large power consumption.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control circuit according to an alternative embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such system, article, or apparatus.
Fig. 1 is a schematic structural diagram of a control circuit according to an embodiment of the present invention, and as shown in fig. 1, the control circuit includes an operational amplifier 10, a switching unit 11, a first resistance unit 12, a second resistance unit 13, and a power supply 14; the non-inverting input terminal of the operational amplifier 10 is used for inputting a control voltage and a detection signal, the inverting input terminal of the operational amplifier 10 is connected to one end of the first resistance unit 12 and one end of the second resistance unit 13, respectively, the other end of the first resistance unit 12 is connected to the power supply 14, the power supply 14 is used for providing a predetermined voltage, and the output terminal of the operational amplifier 10 is connected to the signal control terminal of the switching unit 11.
In the above embodiment, the control circuit is applied to voltage control current, the control circuit can adjust feedback of the operational amplifier by matching the operational amplifier with the second resistance unit, so as to achieve the purpose of adjusting output current of the switching tube, and meanwhile, a power supply with a predetermined voltage is added at the inverting input end of the operational amplifier, the first resistance unit is added, and the voltage ratio is adjusted, so that the technical effect of accurately adjusting and controlling current from zero by voltage is achieved, and further, the technical problems of complex structure and high power consumption of a current control circuit in the related art are solved.
Optionally, the control circuit further includes a sampling unit, wherein an output end of the switch unit is connected to the other end of the second resistance unit, one end of the sampling unit is connected, and the other end of the sampling unit is grounded.
Optionally, the resistance value of the sampling unit is smaller than the resistance value of the first resistance unit and the resistance value of the second resistance unit.
Wherein, the resistance value of the sampling resistor R is relative to the regulating resistor R1And R2To be small enough so that R is matched1And R2The resistance value can ensure that the branch current at the load end is equal to zero. On the other hand, the resistance value of the resistor R is extremely small, so that the driving capability of the circuit is enhanced, and the partial pressure of the sampling resistor is reduced.
Optionally, the sampling unit comprises a sampling resistor.
Optionally, the control circuit further comprises a micro control processor connected to the non-inverting input of the operational amplifier.
Optionally, a load is further included, and one end of the load is connected to the input end of the switch unit.
Alternatively, the predetermined voltage is 5V.
Optionally, the ratio between the first resistance unit and the second resistance unit is
Figure BDA0002382390340000041
Optionally, the switching unit comprises a switching tube.
It should be noted that the switching tube control voltage is a voltage obtained by amplifying the output feedback voltage of the operational amplifier by the operational amplifier.
Optionally, the first resistance unit comprises a trimming resistance.
Optionally, the second resistance unit comprises a feedback resistance.
An alternative embodiment of the invention is described below.
In the prior art, the design of voltage-controlled current is mostly based on an operational amplifier, and in order to realize accurate voltage control on current, double-end control is mostly adopted so as to achieve the effect that the controllable current starts from zero.
In view of the above problem, fig. 2 is a schematic structural diagram of a control circuit according to an alternative embodiment of the present invention, and as shown in fig. 2, the control circuit at least includes an operational amplifier, a plurality of resistors, a switching tube, and a 5V power supply. The non-inverting terminal of the operational amplifier is connected with the control voltage and the detection signal, and the inverting terminal of the operational amplifier is connected with the feedback resistor R1First terminal, adjusting resistor R2First end, 5V power connection allotment resistance R2A second end. The output end of the operational amplifier is connected with a DA output signal of a single chip Microcomputer (MCU), and the input end of the switch tube is connected with the LED. Further, the output end of the switch tube is communicated with the feedback powerResistance R1The second end, sampling resistance R first end, and sampling resistance R second end ground connection. Further, the switch tube controls the voltage to be the voltage of the feedback voltage output by the operational amplifier after being amplified by the operational amplifier.
In the above embodiment, when the positive end of the operational amplifier detects that the control signal is a higher voltage, the voltage at the output end of the operational amplifier is enough to drive the switch tube to be turned on, the load circuit is turned on, and the LED emits light. When the positive end of the operational amplifier detects that the control signal is the lowest voltage, the single chip microcomputer DA outputs a digital signal, the voltage value of the digital signal passes through the operational amplifier, the voltage value of the output end can still drive the switch tube to be opened, the load loop is conducted, and at the moment, the load loop still has current to drive the LED to emit light. From the above, the load loop current is varied with the control voltage. The load loop current increases along with the increase of the control voltage, and when the control voltage is at the maximum value, the load loop current is maximum; when the control voltage is at the minimum value, the current of a load loop is minimum, and an external 5V power supply and a feedback resistor R are arranged1And adjusting the resistance R2The load loop current may be made zero.
Further, the current flowing through the sampling resistor is:
I＝I1+I2；
wherein, I1For the current at the feedback terminal of the operational amplifier, I2The current at the output end of the switch tube is controlled current.
Further, I1The current value is:
Figure BDA0002382390340000051
wherein, UiFor the positive input voltage of the operational amplifier, URFor sampling the resistance voltage, R2Is a resistance R2Resistance value of R1Is a resistance R1The resistance value of (c).
Further, the current I of the output end of the switch tube can be calculated2：
Figure BDA0002382390340000052
Calculated from the above equation:
Ui(R1+R2+R)＝5(R1+R)；
wherein R is relative to R1、R2The resistance is very small, neglecting the resistance of the resistor R, and finally obtaining:
Ui(R1+R2)＝5R1；
the following conclusions can be drawn from the above calculation method: at UiTake the minimum value as UminWhen the current controlled by the control voltage is zero when the minimum value is obtained, the resistor R is adjusted2And a feedback resistor R1Need to meet
Figure BDA0002382390340000053
The ratio of (a) to (b). E.g. UiWhen the minimum value is obtained, the voltage is 0.5V, and if the current controlled when the voltage is required to be controlled to be the minimum value is zero, the resistor R is adjusted2And a feedback resistor R1Need to meet
Figure BDA0002382390340000054
The ratio of (a) to (b).
To this end, the relationship between the controlled current and the control voltage and further R is determined1And R2The ratio of (a) to (b).
In the above embodiment, the control voltage signal can be converted into the current signal by using the operational amplifier and the switching tube, and the 5V power supply is connected to the operational amplifier, and then the current signal passes through the regulating resistor R2And a feedback resistor R1The voltage signal is converted into a current signal to adjust the current of the feedback branch of the operational amplifier. The whole design is based on a negative feedback mechanism of operational amplification, the circuit is in a closed loop state by utilizing the negative feedback mechanism, and the system has good stability due to the self-regulation of the closed loop system.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (11)

1. A control circuit is characterized by comprising an operational amplifier, a switch unit, a first resistance unit, a second resistance unit and a power supply; the non-inverting input end of the operational amplifier is used for inputting control voltage and detection signals, the inverting input end of the operational amplifier is respectively connected with one end of the first resistance unit and one end of the second resistance unit, the other end of the first resistance unit is connected with the power supply, the power supply is used for providing preset voltage, and the output end of the operational amplifier is connected with the signal control end of the switch unit.
2. The control circuit according to claim 1, further comprising a sampling unit, wherein an output terminal of the switching unit is connected to the other terminal of the second resistance unit, one terminal of the sampling unit is connected, and the other terminal of the sampling unit is grounded.
3. The control circuit of claim 2, wherein the resistance value of the sampling unit is smaller than the resistance value of the first resistance unit and the resistance value of the second resistance unit.
4. The control circuit of claim 3, wherein the sampling unit comprises a sampling resistor.
5. The control circuit of claim 1, further comprising a micro-control processor connected to a non-inverting input of the operational amplifier.
6. The control circuit of claim 1, further comprising a load, wherein one end of the load is connected to the input terminal of the switching unit.
7. The control circuit according to any one of claims 1 to 6, wherein the predetermined voltage is 5V.
8. The control circuit of claim 7, wherein a ratio between the first resistance unit and the second resistance unit is
Figure FDA0002382390330000011
9. The control circuit of claim 8, wherein the switching unit comprises a switching tube.
10. The control circuit of claim 8, wherein the first resistance unit comprises a trimming resistance.
11. The control circuit of claim 8, wherein the second resistance unit comprises a feedback resistance.
CN202010087757.4A 2020-02-11 2020-02-11 Control circuit Pending CN111293881A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11224131A (en) * 1998-02-04 1999-08-17 Seiko Instruments Inc Voltage regulator
US20050073355A1 (en) * 2003-10-07 2005-04-07 Stefano Sivero High precision digital-to-analog converter with optimized power consumption
CN201805351U (en) * 2010-08-12 2011-04-20 美凌微电子(上海)有限公司 Control circuit for altering frequency of switching power supply
CN102956202A (en) * 2011-08-29 2013-03-06 通嘉科技股份有限公司 Current control level, constant-current control system, and current control method
CN109511193A (en) * 2017-09-14 2019-03-22 捷微科技股份有限公司 The accurate control device of enable DC load and component with the control device
CN110058630A (en) * 2018-01-18 2019-07-26 大唐移动通信设备有限公司 A kind of voltage current transformating circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11224131A (en) * 1998-02-04 1999-08-17 Seiko Instruments Inc Voltage regulator
US20050073355A1 (en) * 2003-10-07 2005-04-07 Stefano Sivero High precision digital-to-analog converter with optimized power consumption
CN201805351U (en) * 2010-08-12 2011-04-20 美凌微电子(上海)有限公司 Control circuit for altering frequency of switching power supply
CN102956202A (en) * 2011-08-29 2013-03-06 通嘉科技股份有限公司 Current control level, constant-current control system, and current control method
CN109511193A (en) * 2017-09-14 2019-03-22 捷微科技股份有限公司 The accurate control device of enable DC load and component with the control device
CN110058630A (en) * 2018-01-18 2019-07-26 大唐移动通信设备有限公司 A kind of voltage current transformating circuit

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