CN113054850B - Switch control circuit based on current transformer - Google Patents
Switch control circuit based on current transformer Download PDFInfo
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- CN113054850B CN113054850B CN202110341406.6A CN202110341406A CN113054850B CN 113054850 B CN113054850 B CN 113054850B CN 202110341406 A CN202110341406 A CN 202110341406A CN 113054850 B CN113054850 B CN 113054850B
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
Abstract
The invention discloses a current transformer-based switch control circuit, which relates to the field of switch control and comprises a current transformer module, a power-taking rectifying module, a signal compensation module, a central control module, an electronic switch module, a voltage control module, a voltage-stabilizing output module and a feedback loop module, wherein the current transformer module is used for reducing current, the power-taking rectifying module is used for converting alternating current into direct current, the signal compensation module is used for improving frequency characteristics, the central control module is used for controlling a circuit and detecting signals, the voltage control module is used for adjusting and controlling output voltage, the voltage-stabilizing output module is used for outputting stabilized voltage, and the feedback loop module is used for improving voltage precision. The switch control circuit based on the current transformer utilizes the current transformer to supply power, controls the singlechip to control the circuit by detecting a current signal, improves the safety of the circuit, utilizes the voltage control module to regulate voltage output, improves the precision of output voltage and improves the voltage-stabilizing power supply effect.
Description
Technical Field
The invention relates to the field of switch control, in particular to a switch control circuit based on a current transformer.
Background
Along with the continuous development and progress of electronic technology, various switch control circuits are innovated and applied, the current commonly used switch is generally set by a single-phase single wire, most of the power supplies are used for controlling the on-off of the circuit by utilizing a relay switch to obtain the power supply, the power supply is required to be obtained when the electric equipment runs, the quality of the power supply has direct influence on the normal use of the electric equipment, most of the current electric equipment on the market is large in size, difficult to install, high in cost, lower in circuit safety, low in output voltage precision, and when the voltage fluctuates, the control on the switch is inaccurate and slow, and the circuit is easy to damage.
Disclosure of Invention
The present invention is directed to a switch control circuit based on a current transformer, so as to solve the problems set forth in the foregoing background.
In order to achieve the purpose, the invention provides the following technical scheme:
a current transformer based switch control circuit, comprising: the device comprises a current transformer module, a power-taking rectification module, a signal compensation module, an electronic switch module, a central control module, a voltage stabilizing output module and a feedback loop module;
the power-taking output end of the current transformer module is connected with the input end of the electronic switch module through the power-taking rectifying module; the other output end of the current transformer module is connected with the input end of the signal compensation module;
the output end of the signal compensation module is connected with the signal acquisition end of the central control module;
the output end of the electronic switch module is connected with the input end of the voltage-stabilizing output module and the input end of the feedback loop module through a voltage control module; the switch control end of the electronic switch module is connected with the control end of the central control module;
the central control module is used for controlling the switch control end of the electronic switch module through signal acquisition of the signal compensation module, acquiring the current signal of the signal compensation module through control of an internal software system, and controlling the electronic switch module to disconnect a circuit when the current value exceeds a set current value by utilizing a designed software system.
Compared with the prior art, the invention has the beneficial effects that: the switch control circuit based on the current transformer utilizes the current transformer to supply power, controls the singlechip to control the circuit by detecting a current signal, improves the safety of the circuit, utilizes the voltage control module to regulate voltage output, improves the precision of output voltage and improves the voltage-stabilizing power supply effect.
Drawings
Fig. 1 is a schematic block diagram of the principle provided by the embodiment of the present invention.
Fig. 2 is a circuit diagram of a switch control circuit of a current transformer according to an embodiment of the present invention.
Fig. 3 is a functional pin diagram of the LNK562DN voltage chip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, an embodiment of the present invention provides a current transformer-based switch control circuit 9, which includes a current transformer module 1, a power-taking rectification module 2, a signal compensation module 3, a central control module 4, an electronic switch module 5, a voltage control module 6, a voltage-stabilizing output module 7, and a feedback loop module 8.
Specifically, the current transformer module 1 is used for taking electricity and reducing current, the electricity taking rectification module is used for rectifying the obtained alternating current into direct current, the signal compensation module is used for improving frequency characteristics, the electronic switch module 5 is used for controlling the circuit to be turned off, the voltage control module 6 is used for adjusting and controlling output voltage, the voltage stabilizing output module 7 is used for outputting stable voltage, and the feedback loop module 8 is used for improving the voltage precision of the voltage control module;
the central control module 4 is used for controlling a switch control end of the electronic switch module through signal acquisition of the signal compensation module, acquiring a current signal of the signal compensation module through control of an internal software system, and controlling the electronic switch module to disconnect a circuit when a set current value is exceeded by utilizing a designed software system;
further, the power-taking output end of the current transformer module 1 is connected with the input end of the electronic switch module 5 through the power-taking rectification module 2; the other output end of the current transformer module 1 is connected with the input end of the signal compensation module 3; the output end of the signal compensation module 3 is connected with the signal acquisition end of the central control module 4; the output end of the electronic switch module 5 is connected with the input end of the voltage-stabilizing output module 7 and the input end of the feedback loop module 8 through the voltage control module 6; the switch control end of the electronic switch module 5 is connected with the control end of the central control module 4.
Referring to fig. 2, in an embodiment of the current transformer-based switch control circuit 9 according to the present invention, the current transformer module 1 includes a current transformer CT; the power taking and rectifying module 2 comprises a rectifier T and diodes D1-D2; the electronic switch module 5 comprises a MOS transistor M1, resistors R1-R3, a triode N1 and a capacitor C2; the central control module 4 comprises a central processing chip U1;
specifically, the primary side of the current transformer CT is connected with the alternating current input voltage AC, one end of the secondary side of the current transformer CT is connected with the anode of the diode D1 and the port 1 of the rectifier T, the other end of the secondary side of the current transformer CT is connected with the anode of the diode D2 and the port 3 of the rectifier T, the cathode of the diode D1 is connected with the cathode of the diode D2, the port 4 of the rectifier T is connected with the anode of the capacitor C1, the resistor R1 and the S-pole of the MOS transistor M1, the port 2 of the rectifier T is connected with the ground, the cathode of the capacitor C1, the emitter of the transistor N1 and the capacitor C2, the G-pole of the MOS transistor M1 is connected with the other ends of the resistor R2 and the capacitor C2, the other end of the resistor R1 is connected with the collector of the transistor N1 and the other end of the resistor R2, and the base of the transistor N1 is connected with the I/O port of the central processing chip U1 through the resistor R3;
specifically, the rectifier T rectifies input ac into dc using a bridge rectifier circuit, wherein the bridge rectifier is butted two by two using four diodes;
further, the voltage control module 6 comprises capacitors C3-C4, a capacitor C13, a resistor R4, diodes D3-D4, a voltage chip U2 and a transformer W; the voltage stabilizing output module 7 comprises a secondary winding W2 of the transformer W, a diode D5, capacitors C5-C7 and a voltage stabilizer IC 1; the feedback loop module 8 comprises an auxiliary winding W1 of the transformer W, a diode D6, resistors R5-R6 and a capacitor C8;
specifically, the capacitor C3 is connected to the D-pole of the MOS transistor M1, the resistor R4, the capacitor C13, and the different-name end of the primary winding of the transformer W, the other end of the capacitor C3 is connected to the other end of the resistor R4 and the cathode of the diode D3, the anode of the diode D3 is connected to the same-name end of the primary winding of the transformer W and the anode of the diode D4, the cathode of the diode D4 is connected to the D-pole of the voltage chip U4, the FB-end of the voltage chip U4 is connected to one end of the resistor R4 and one end of the resistor R4, the BP-end of the voltage chip U4 is connected to one end of the capacitor C4, the S-end of the voltage chip U4, the other end of the capacitor C4, the other end of the resistor R4, the anode of the diode D4 and one end of the capacitor C4 are grounded, the other end of the auxiliary winding W-pole of the transformer W4 is connected to the same-name end of the transformer W4, and the cathode of the diode W4 are connected to the positive terminal of the diode 4 and the positive terminal of the diode D4 through the diode 4 A port 2, a synonym terminal of a secondary winding W2 of the transformer W is connected with the other end of the capacitor C13, the negative electrode of the capacitor C5, a port 1 of the voltage stabilizer IC1, the negative electrode of the capacitor C6, a capacitor C7 and a GND terminal, and a port 3 of the voltage stabilizer IC1 is connected with the positive electrode of the capacitor C6, the other end of the capacitor C7 and a VOUT output terminal;
further, the signal compensation module 3 comprises capacitors C9-C12, an operational amplifier A1-A2, resistors R7-R11, diodes D7-D9 and a current transformer CT;
specifically, one end of a capacitor C9 is connected with one end of the secondary side of the current transformer CT, the other end of the secondary side of the current transformer CT is connected with the anode of a diode D7, the cathode of a diode D8, the in-phase end of an operational amplifier A1, a capacitor C12, a resistor R11, a resistor R10 and a ground end, the other end of a capacitor C9 is connected with a resistor R7, a capacitor C10 and a resistor R8, the other end of a resistor R7 is connected with the cathode of a diode D7, the output end of the operational amplifier A1 is connected with the other end of the capacitor C10, the other end of the resistor R8, the in-phase end of the operational amplifier A2, the other end of the capacitor C12, the anode of the diode D9, the other end of the resistor R11 and the AD port of the central processing chip U1, the output end of the operational amplifier A2 is connected with the other end of the resistor R9 and the capacitor C11, the out-phase end of the operational amplifier A2 is connected with the resistor R10 and the other end of the capacitor C11, and the cathode of the diode D9 is connected with +5V voltage.
Referring to fig. 3, in the embodiment of the present invention, a functional pin of the LNK562DN voltage chip is provided, where pin 1, pin 2, pin 7, and pin 8 of the LNK562DN voltage chip are MOS source electrodes, with reference to ground, pin 3 of the LNK562DN voltage chip is a power supply voltage, an external pin bypass capacitor, pin 4 of the LNK562DN voltage chip is a feedback signal input, and is controlled by intentional voltage stabilization, pin 5 of the LNK562DN voltage chip is a MOS drain electrode, and pin 6 of the LNK562DN voltage chip is a null pin.
In the embodiment of the invention: the current transformer CT gets the alternating current, the low-frequency characteristic of the current transformer CT is improved through the signal compensation module, an output signal is sent to the inside of the single chip microcomputer U1 through an AD end of the single chip microcomputer U1, the calculation is carried out in the single chip microcomputer U1, if the current transformer is in a short circuit or is in a serious overload condition, a large current flows through a primary side of the transformer, the current on a secondary side of the transformer is increased, when the current on the secondary side exceeds the calculation value in the single chip microcomputer U1, an I/O port of the single chip microcomputer U1 is triggered to output a control signal, a triode N1 is conducted, an MOS tube M1 is cut off, the current transformer gets the end, when a circuit is normal, the current passes through a voltage chip U2, in a range of the current transformer allowed to output the current, and when a feedback loop detects that the final output voltage exceeds a reference value, the voltage chip U2 controls and adjusts the output voltage through an electronic switch in the voltage chip, until the output voltage is regulated to the reference value.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A switch control circuit based on a current transformer is characterized in that,
this switch control circuit based on current transformer includes: the device comprises a current transformer module, a power-taking rectification module, a signal compensation module, an electronic switch module, a central control module, a voltage stabilizing output module and a feedback loop module;
the power-taking output end of the current transformer module is connected with the input end of the electronic switch module through the power-taking rectifying module; the other output end of the current transformer module is connected with the input end of the signal compensation module;
the output end of the signal compensation module is connected with the signal acquisition end of the central control module;
the output end of the electronic switch module is connected with the input end of the voltage-stabilizing output module and the input end of the feedback loop module through a voltage control module; the switch control end of the electronic switch module is connected with the control end of the central control module;
the central control module is used for controlling the switch control end of the electronic switch module through signal acquisition of the signal compensation module, acquiring a current signal of the signal compensation module through control of an internal software system, and controlling the electronic switch module to disconnect a circuit when a set current value is exceeded by utilizing a designed software system;
the signal compensation module comprises capacitors C9-C12, an operational amplifier A1-A2, resistors R7-R11, diodes D7-D9 and a current transformer CT;
one end of the capacitor C9 is connected with one end of the secondary side of the current transformer CT, the other end of the secondary side of the current transformer CT is connected with the anode of the diode D7, the cathode of the diode D8, the in-phase end of the operational amplifier A1, the capacitor C12, the resistor R11, the resistor R10 and the ground end, the other end of the capacitor C9 is connected with the resistor R7, the capacitor C10 and the resistor R8, the other end of the resistor R7 is connected with the cathode of the diode D7, the output end of the operational amplifier A1 is connected with the other end of the capacitor C10, the other end of the resistor R8, the in-phase end of the operational amplifier A2, the other end of the capacitor C12, the anode of the diode D9, the other end of the resistor R11 and the AD port of the central processing chip U1, the output end of the operational amplifier A2 is connected with the other end of the resistor R9 and the capacitor C11, the out-phase end of the operational amplifier A2 is connected with the other ends of the resistor R10 and the capacitor C11, and the cathode of the diode D9 is connected with +5V voltage.
2. The current transformer based switch control circuit according to claim 1, wherein the current transformer module comprises a current transformer CT; the power-taking rectifying module comprises a rectifier T and diodes D1-D2; the electronic switch module comprises a MOS transistor M1, resistors R1-R3, a triode N1 and a capacitor C2; the central control module comprises a central processing chip U1;
the primary side of the current transformer CT is connected with an alternating current input voltage AC, one end of the secondary side of the current transformer CT is connected with the anode of a diode D1 and a port 1 of a rectifier T, the other end of the secondary side of the current transformer CT is connected with the anode of a diode D2 and a port 3 of the rectifier T, the cathode of a diode D1 is connected with the cathode of a diode D2, a port 4 of the rectifier T is connected with the anode of a capacitor C1, a resistor R1 and the S pole of a MOS tube M1, a port 2 of the rectifier T is connected with the ground, the cathode of a capacitor C1, the emitter of a triode N1 and a capacitor C2, the G pole of the MOS tube M1 is connected with a resistor R2 and the other end of a capacitor C2, the other end of the resistor R1 is connected with the collector of a triode N1 and the other end of the resistor R2, and the base of the triode N1 is connected with an I/O port of a central processing chip U1 through a resistor R3.
3. The current transformer-based switch control circuit according to claim 2, wherein the voltage control module comprises capacitors C3-C4, a capacitor C13, a resistor R4, diodes D3-D4, a voltage chip U2 and a transformer W; the voltage stabilizing output module comprises a secondary winding W2 of the transformer W, a diode D5, capacitors C5-C7 and a voltage stabilizer IC 1; the feedback loop module comprises an auxiliary winding W1 of a transformer W, a diode D6, resistors R5-R6 and a capacitor C8;
the capacitor C3 is connected with the pole D of the MOS transistor M1, the resistor R4, the capacitor C13 and the different-name terminal of the primary winding of the transformer W, the other end of the capacitor C3 is connected with the other end of the resistor R4 and the cathode of the diode D3, the anode of the diode D3 is connected with the same-name terminal of the primary winding of the transformer W and the anode of the diode D4, the cathode of the diode D4 is connected with the terminal D of the voltage chip U4, the FB of the voltage chip U4 is connected with one end of the resistor R4 and one end of the resistor R4, the BP terminal of the voltage chip U4 is connected with one end of the capacitor C4, the S terminal of the voltage chip U4, the other end of the capacitor C4, the other end of the resistor R4, the anode of the diode D4 and one end of the capacitor C4 are all grounded, the other end of the resistor R4 is connected with the same-name terminal of the auxiliary winding W4 of the transformer W4 and the other end of the capacitor C4, the different-name terminal of the auxiliary winding W4 of the transformer W4 is connected with the cathode of the diode D4, and the anode of the positive terminal of the secondary winding of the transformer W4 are connected with the positive terminal IC 6852 terminal of the diode D4 and the positive terminal of the diode D4 of the transformer W4 through the diode 4, the diode D4 port of the diode D4 and the positive terminal of the diode D4 are connected with the positive terminal 4, the positive terminal of the diode D4, the positive terminal of the diode D4 port of the diode 4, the diode D4 are connected with the terminal of the diode D4, the positive terminal of the diode 4 and the positive terminal of the diode D4 are connected with the diode D4, the positive terminal of the diode D4, the diode D4 are connected with the positive terminal of the diode D4, the diode D4 of the diode D4 and the diode D4 are connected with the terminal of the diode 4 are connected with the terminal of the diode D4, the diode D4 are connected with the diode D4, the terminal of the diode D4 of the terminal of the diode D4, and the diode D4 are connected with the diode D4, the diode D4 The end with the different name of a secondary winding W2 of the transformer W is connected with the other end of the capacitor C13, the negative electrode of the capacitor C5, the port 1 of the voltage stabilizer IC1, the negative electrode of the capacitor C6, the capacitor C7 and the GND end, and the port 3 of the voltage stabilizer IC1 is connected with the positive electrode of the capacitor C6, the other end of the capacitor C7 and the VOUT output end.
4. The current transformer-based switch control circuit according to claim 3, wherein the central processing chip U1 is an STC89C52 single chip microcomputer, and the voltage chip U2 is an LNK562DN chip.
5. The current transformer-based switch control circuit according to claim 3, wherein the voltage regulator IC1 is an LM7812 three-terminal integrated voltage regulator chip.
6. The current transformer based switch control circuit of claim 3, wherein the operational amplifier A1-A2 is a TL072 operational amplifier.
7. The current transformer-based switch control circuit according to claim 3, wherein the diodes D1-D2, the diode D5, the diode D6, the diode D7 and the diode D8 are all 1N4001 diodes, the diode D3 is a 1N5408 rectifier diode, and the diode D4 is a UF4006 voltage regulator diode.
8. The current transformer-based switch control circuit according to claim 3, wherein the transistor N1 is an NPN transistor, and the MOS transistor M1 is an N-channel enhancement transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110341406.6A CN113054850B (en) | 2021-03-30 | 2021-03-30 | Switch control circuit based on current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110341406.6A CN113054850B (en) | 2021-03-30 | 2021-03-30 | Switch control circuit based on current transformer |
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| CN113054850A CN113054850A (en) | 2021-06-29 |
| CN113054850B true CN113054850B (en) | 2022-06-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4992723A (en) * | 1989-03-31 | 1991-02-12 | Square D Company | Fault-powered power supply |
| JP3957682B2 (en) * | 2003-12-19 | 2007-08-15 | シャープ株式会社 | Switching power supply device and electronic device using the same |
| CN100405833C (en) * | 2006-06-01 | 2008-07-23 | 南京Lg同创彩色显示系统有限责任公司 | Compensation loop for eliminating switch frequency change to generate electromagnetic interference phenomenon |
| CN101594046B (en) * | 2008-05-29 | 2011-08-10 | 洋鑫科技股份有限公司 | Inrush current limiter |
| CN105375435B (en) * | 2015-11-30 | 2018-06-26 | 深圳市中电电力技术股份有限公司 | Electricity and the Self-power protective device and system of tripping are taken based on three-phase current sensing |
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