CN115207889A - Charging head circuit capable of automatically switching charging voltage - Google Patents
Charging head circuit capable of automatically switching charging voltage Download PDFInfo
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- CN115207889A CN115207889A CN202210852327.6A CN202210852327A CN115207889A CN 115207889 A CN115207889 A CN 115207889A CN 202210852327 A CN202210852327 A CN 202210852327A CN 115207889 A CN115207889 A CN 115207889A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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
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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
- H02H7/20—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 electronic equipment
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a charging head circuit capable of automatically switching charging voltage, which relates to the technical field of power supply switching control and comprises a power supply module, a charging control module and a charging control module, wherein the power supply module is used for supplying power; the voltage reduction module is used for reducing voltage and supplying power; the voltage switching control module is used for switching and inputting the power supply; the current limiting control module is used for current limiting protection control; the charging head module is used for outputting electric energy; the detection comparison module is used for voltage sampling and threshold comparison; the delay control module is used for outputting a delay control signal; and the isolation transmission control module is used for isolating and controlling the work of voltage switching. The charging head circuit capable of automatically switching the charging voltage is characterized in that the detection comparison module is used for sampling and threshold comparison of output electric energy, when overvoltage occurs, the current limiting control module is used for carrying out current limiting work, the isolation transmission control module is used for controlling the power supply module and the voltage reduction module to carry out switching work, the delay control module is used for avoiding switching of the power supply voltage caused by transient voltage generated when the voltage is switched on, and a rear-stage circuit is protected.
Description
Technical Field
The invention relates to the technical field of power supply switching control, in particular to a charging head circuit capable of automatically switching charging voltage.
Background
Along with the continuous development of electronic equipment, electronic equipment's kind constantly increases, required power supply circuit's power supply requirement also is constantly improving, wherein the head that charges is as the equipment that electronic equipment and power are connected, can handle the electric energy of input and transmit for electronic equipment, the quality of the power supply is decided to the quality of the head that charges, the steady voltage of power in certain extent is handled to the most mode realization power that adopts switching power supply circuit of current head circuit that charges, but when the power supply source appears unusually, unable automatic switch charging voltage, and lead to the burnout of head that charges, and when meetting the jump in the twinkling of an eye in the voltage, the misjudgement appears easily, directly close the head that charges, stop the power supply, lead to experiencing poorly, therefore remain to improve.
Disclosure of Invention
The embodiment of the invention provides a charging head circuit capable of automatically switching charging voltage, which is used for solving the problems in the background technology.
According to an embodiment of the present invention, there is provided a charging head circuit for automatically switching a charging voltage, the charging head circuit for automatically switching a charging voltage including: the device comprises a power module, a voltage reduction module, a voltage switching control module, a current limiting control module, a charging head module, a detection comparison module, a time delay control module and an isolation transmission control module;
the power supply module is used for providing required electric energy;
the voltage reduction module is connected with the power supply module and used for reducing the electric energy output by the power supply module through a voltage reduction circuit;
the voltage switching control module is connected with the power supply module and the voltage reduction module and is used for controlling the switching input of the power supply module and the voltage reduction module through a power tube circuit;
the current limiting control module is connected with the voltage switching control module, is used for transmitting input electric energy and is used for controlling the current limiting of the input electric energy by controlling the access of the current limiting circuit;
the charging head module is connected with the current-limiting control module, is used for receiving and outputting electric energy and is connected with electronic equipment;
the detection comparison module is connected with the charging head module and the current-limiting control module, is used for detecting the voltage output by the current-limiting control module, is used for comparing the detected voltage with a set voltage threshold value and outputting a comparison result, and is used for controlling the work of the current-limiting control module;
the delay control module is connected with the voltage switching control module and the isolation transmission control module, and is used for outputting a delay control signal through a delay control circuit and delaying the work of the isolation transmission control module;
the isolation transmission control module is connected with the voltage switching control module and the detection comparison module, is used for receiving the delay control signal and the comparison result, and is used for isolating and controlling the work of the voltage switching control module.
Compared with the prior art, the invention has the beneficial effects that: the charging head circuit capable of automatically switching the charging voltage is characterized in that the detection comparison module is used for sampling and threshold comparison of output electric energy to be used as a basis for switching the charging head voltage, when overvoltage occurs, the current limiting control module is used for performing current limiting work, the isolation transmission control module is used for controlling the power supply module and the voltage reduction module to perform switching work, the input voltage is reduced, the charging head is prevented from being damaged due to overvoltage, the safety of the charging head is improved, the delay control module is used for performing delay control on the switched-on instant voltage, the switching of the power supply voltage due to the instant voltage generated when the voltage is switched on is avoided, the control precision of the charging head is improved, and meanwhile, the current limiting control module absorbs the instant voltage current to protect a rear-stage circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a charging head circuit capable of automatically switching a charging voltage according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a charging head circuit for automatically switching a charging voltage according to an embodiment of the present invention.
Fig. 3 is a connection circuit diagram of a voltage switching control module according to an embodiment of the present invention.
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.
In embodiment 1, referring to fig. 1, a charging head circuit for automatically switching a charging voltage includes: the device comprises a power module 1, a voltage reduction module 2, a voltage switching control module 3, a current limiting control module 4, a charging head module 5, a detection comparison module 6, a time delay control module 7 and an isolation transmission control module 8;
specifically, the power module 1 is used for providing required electric energy;
the voltage reduction module 2 is connected with the power supply module 1 and used for reducing the electric energy output by the power supply module 1 through a voltage reduction circuit;
the voltage switching control module 3 is connected with the power module 1 and the voltage reduction module 2 and is used for controlling the switching input of the power module 1 and the voltage reduction module 2 through a power tube circuit;
the current limiting control module 4 is connected with the voltage switching control module 3, is used for transmitting input electric energy, and is used for controlling the access of a current limiting circuit and carrying out current limiting control on the input electric energy;
the charging head module 5 is connected with the current limiting control module 4, is used for receiving and outputting electric energy and is connected with electronic equipment;
the detection comparison module 6 is connected with the charging head module 5 and the current limiting control module 4, and is used for detecting the voltage output by the current limiting control module 4, comparing the detected voltage with a set voltage threshold value and outputting a comparison result, and controlling the operation of the current limiting control module 4;
the delay control module 7 is connected with the voltage switching control module 3 and the isolation transmission control module 8, and is used for outputting a delay control signal through a delay control circuit and delaying the work of the isolation transmission control module 8;
and the isolation transmission control module 8 is connected with the voltage switching control module 3 and the detection comparison module 6, and is used for receiving the delay control signal and the comparison result and for isolating and controlling the work of the voltage switching control module 3.
In a specific embodiment, the power module 1 is a required power supply; the voltage reduction module 2 can adopt, but is not limited to, a voltage reduction circuit such as a transformer and a voltage reduction chip to complete voltage reduction processing of the power module 1; the charging head module 5 is an output terminal of the charging head and is used for connecting electronic equipment.
In this embodiment, referring to fig. 2 and fig. 3, the voltage switching control module 3 includes a second power transistor Q2, an eleventh resistor R11, a third power transistor Q3, a twelfth resistor R12, a fourteenth resistor R14, a thirteenth resistor R13, and a fourth switching transistor VT4;
specifically, the drain of the second power transistor Q2 is connected to the power module 1 and is connected to the gate of the second power transistor Q2 and one end of a thirteenth resistor R13 through an eleventh resistor R11, the source of the second power transistor Q2 and the drain of the third power transistor Q3 are connected to the current limiting control module 4, the source of the third power transistor Q3 is connected to the voltage dropping module 2 and is connected to the gate of the third power transistor Q3 and one end of a fourteenth resistor R14 through a twelfth resistor R12, the other end of the fourteenth resistor R14 is connected to the collector of the fourth switch transistor VT4, the emitter of the fourth switch transistor VT4 is grounded, and the base of the fourth switch transistor VT4 and the other end of the thirteenth resistor R13 are connected to the isolation transmission control module 8.
In a specific embodiment, the second power transistor Q2 may be an N-channel enhancement MOS transistor, and due to the eleventh resistor R11, the second power transistor Q2 is in a conducting state; the third power transistor Q3 may be a P-channel enhancement MOS transistor, and due to the twelfth resistor R12, the third power transistor Q3 is in a cut-off state; the fourth switching tube VT4 may be a PNP type triode for controlling the conduction of the third power tube Q3.
Further, the current limiting control module 4 includes a ninth resistor R9, a fifth capacitor C5, a tenth resistor R10, a first power transistor Q1, an eighth resistor R8, a third switching transistor VT3, and a second power supply VCC2; the charging head module 5 comprises a charging head output port;
specifically, one end of the ninth resistor R9, one end of the tenth resistor R10, and a sixth stage of the first power transistor Q1 are connected to the source of the second power transistor Q2, the other end of the ninth resistor R9 is connected to the other end of the tenth resistor R10, the source of the first power transistor Q1, and the charging head output port through the fifth capacitor C5, the gate of the first power transistor Q1 is connected to the emitter of the third switching transistor VT3 and is connected to the ground through the eighth resistor R8, the collector of the third switching transistor VT3 is connected to the second power source VCC2, and the base of the third switching transistor VT3 is connected to the detection and comparison module 6.
In a specific embodiment, the ninth resistor R9, the fifth capacitor C5 and the tenth resistor R10 form a current limiting circuit; the first power transistor Q1 may be a P-channel enhancement MOS transistor, which is in a conducting state due to the eighth resistor R8; the third switching transistor VT3 may be an NPN transistor.
Further, the detection comparing module 6 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth capacitor C4, a first comparator A1, a fifteenth resistor R15, an inverter U3, and a voltage threshold;
specifically, one end of the fifth resistor R5 is connected to the charging head output port, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and is connected to the ground end and one end of the fourth capacitor C4 through the seventh resistor R7, the other end of the sixth resistor R6 is connected to the other end of the fourth capacitor C4 and the inverting end of the first comparator A1, the non-inverting end of the first comparator A1 is connected to the voltage threshold, the output end of the first comparator A1 is connected to the input end of the inverter U3 through the fifteenth resistor R15, and the output end of the inverting end is connected to the base of the third switching transistor VT 3.
In a specific embodiment, the first comparator A1 may be an LM393 comparator; the fifth resistor R5 and the seventh resistor R7 form a resistor voltage divider circuit.
Further, the isolation transmission control module 8 includes a first power VCC1, a third resistor R3, and a first optocoupler U2;
specifically, first power VCC1 connects first opto-coupler U2's first end through third resistance R3, and first opto-coupler U2's second end is connected the input of phase inverter U3, the third end of first opto-coupler U2 are connected the base of fourth switch tube VT4, the ground connection end is held to first opto-coupler U2's fourth end.
In a specific embodiment, the first optical coupler U2 may be a PC817 optical coupler.
Further, the delay control module 7 includes a first capacitor C1 and a voltage regulator IC1;
specifically, one end of the first capacitor C1 and the first end of the voltage stabilizer IC1 are connected to the source of the second power tube Q2, and the other end of the first capacitor C1 and the second end of the voltage stabilizer IC1 are both grounded.
Further, the delay control module 7 further includes a first resistor R1, a second capacitor C2, a timer U1, a second switching tube VT2, a fourth resistor R4, a third capacitor C3, a second resistor R2, and a first switching tube VT1;
specifically, one end of the first resistor R1, the first end of the timer U1, and the collector of the second switch tube VT2 are all connected to the third end of the regulator IC1, the other end of the first resistor R1 is connected to the second end and the sixth end of the timer U1 and is connected to the ground through the second capacitor C2, the fifth end of the timer U1 is connected to the first end of the timer U1, the emitter of the first switch tube VT1, and the ground through the third capacitor C3, the eighth end of the timer U1 is connected to the emitter of the second switch tube VT2, the base of the second switch tube VT2 is connected to the output end of the inverting terminal through the fourth resistor R4, the third end of the timer U1 is connected to the base of the first switch tube VT1 through the second resistor R2, and the collector of the first switch tube VT1 is connected to the first end of the first optocoupler U2.
In a specific embodiment, the voltage regulator IC1 may be a 7809 three-terminal integrated circuit; the timer U1 can use NE555 integrated voltage to complete delay control.
The invention relates to a charging head circuit capable of automatically switching charging voltage, which is connected with a power module 1 through an input module of a charging head, the power module 1 provides required electric energy, when the circuit is normal, a second power tube Q2 is connected with a first power tube Q1, the power module 1 normally provides electric energy, when voltage signals sampled by a fifth resistor R5 and a seventh resistor R7 exceed a set voltage threshold value, a first comparator A1 outputs low level, an inverter U3 outputs high level in an inverted mode, the third switch tube VT3 and the second switch tube VT2 are controlled to be connected, at the moment, the first power tube Q1 is cut off, the input electric energy is subjected to current limiting processing through a current limiting control module 4, meanwhile, the timer U1 starts to work, and controls the first switch tube VT1 to be conducted in a delayed mode, so that the first optocoupler U2 is cut off, after the delay, the first switch tube VT1 is cut off, if the first comparator A1 is still in an overvoltage state, the low level is still output, the first optocoupler U2 is conducted, a base electrode of a fourth switch tube VT4 is pulled to be connected, the third switch tube VT3 is connected, the third switch tube VT2 is connected with a second switch, and the second switch is connected with a step-down input circuit, and the second power tube VT2 is connected with a step-down input circuit, and the input circuit.
This automatic switch charging voltage's first circuit that charges is sampled and threshold value comparison by detection comparison module 6 to the electric energy of output, as the basis that the first voltage that charges switches, when the excessive pressure appears, will carry out the current-limiting work by current-limiting control module 4, and switch over the work by isolation transmission control module 8 control power module 1 and step-down module 2, reduce the voltage of input, avoid the head that charges to damage because of the excessive pressure, improve the security of the head that charges, and carry out time delay control by time delay control module 7 to the transient voltage of switch-on, avoid resulting in mains voltage's switching because the transient voltage that produces during the switch-on voltage, improve the control accuracy to the head that charges, current-limiting control module 4 is to transient voltage simultaneously. The current is absorbed to protect the post-stage circuit.
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 (7)
1. A charging head circuit capable of automatically switching charging voltage is characterized in that,
this automatic switching charging voltage's first circuit that charges includes: the device comprises a power module, a voltage reduction module, a voltage switching control module, a current limiting control module, a charging head module, a detection comparison module, a time delay control module and an isolation transmission control module;
the power supply module is used for providing required electric energy;
the voltage reduction module is connected with the power supply module and used for reducing the electric energy output by the power supply module through a voltage reduction circuit;
the voltage switching control module is connected with the power supply module and the voltage reduction module and is used for controlling the switching input of the power supply module and the voltage reduction module through a power tube circuit;
the current limiting control module is connected with the voltage switching control module, is used for transmitting input electric energy and is used for controlling the current limiting of the input electric energy by controlling the access of the current limiting circuit;
the charging head module is connected with the current limiting control module, is used for receiving and outputting electric energy and is connected with electronic equipment;
the detection comparison module is connected with the charging head module and the current-limiting control module, is used for detecting the voltage output by the current-limiting control module, is used for comparing the detected voltage with a set voltage threshold value and outputting a comparison result, and is used for controlling the work of the current-limiting control module;
the delay control module is connected with the voltage switching control module and the isolation transmission control module, is used for outputting a delay control signal through a delay control circuit and is used for delaying the work of the isolation transmission control module;
and the isolation transmission control module is connected with the voltage switching control module and the detection comparison module, is used for receiving the delay control signal and the comparison result, and is used for isolating and controlling the work of the voltage switching control module.
2. A charging head circuit capable of automatically switching charging voltage according to claim 1, wherein the voltage switching control module comprises a second power transistor, an eleventh resistor, a third power transistor, a twelfth resistor, a fourteenth resistor, a thirteenth resistor and a fourth switch transistor;
the drain electrode of the second power tube is connected with the power supply module and is connected with the grid electrode of the second power tube and one end of a thirteenth resistor through an eleventh resistor, the source electrode of the second power tube and the drain electrode of the third power tube are connected with the current limiting control module, the source electrode of the third power tube is connected with the voltage reduction module and is connected with the grid electrode of the third power tube and one end of a fourteenth resistor through a twelfth resistor, the other end of the fourteenth resistor is connected with the collector electrode of a fourth switch tube, the emitting electrode of the fourth switch tube is grounded, and the base electrode of the fourth switch tube and the other end of the thirteenth resistor are connected with the isolation transmission control module.
3. The charging head circuit capable of automatically switching the charging voltage according to claim 2, wherein the current limiting control module comprises a ninth resistor, a fifth capacitor, a tenth resistor, a first power transistor, an eighth resistor, a third switching transistor, and a second power supply; the charging head module comprises a charging head output port;
one end of the ninth resistor, one end of the tenth resistor and the sixth stage of the first power tube are connected with the source electrode of the second power tube, the other end of the ninth resistor is connected with the other end of the tenth resistor, the source electrode of the first power tube and the output port of the charging head through a fifth capacitor, the grid electrode of the first power tube is connected with the emitting electrode of the third switching tube and is connected with the ground end through an eighth resistor, the collector electrode of the third switching tube is connected with the second power supply, and the base electrode of the third switching tube is connected with the detection comparison module.
4. A charging head circuit capable of automatically switching charging voltage according to claim 3, wherein the detection comparison module comprises a fifth resistor, a sixth resistor, a seventh resistor, a fourth capacitor, a first comparator, a fifteenth resistor, an inverter, a voltage threshold;
one end of the fifth resistor is connected with the output port of the charging head, the other end of the fifth resistor is connected with one end of the sixth resistor and is connected with the ground end and one end of the fourth capacitor through the seventh resistor, the other end of the sixth resistor is connected with the other end of the fourth capacitor and the inverting end of the first comparator, the non-inverting end of the first comparator is connected with the voltage threshold, the output end of the first comparator is connected with the input end of the phase inverter through the fifteenth resistor, and the output end of the inverting end is connected with the base electrode of the third switching tube.
5. A charging head circuit capable of automatically switching charging voltage according to claim 4, wherein the isolation transmission control module comprises a first power supply, a third resistor, a first optical coupler;
the first power supply is connected with the first end of the first optical coupler through a third resistor, the second end of the first optical coupler is connected with the input end of the phase inverter, the third end of the first optical coupler is connected with the base of the fourth switch tube, and the fourth end of the first optical coupler is connected with the ground end.
6. The charging head circuit according to claim 5, wherein the delay control module comprises a first capacitor and a voltage regulator;
one end of the first capacitor and the first end of the voltage stabilizer are connected with the source electrode of the second power tube, and the other end of the first capacitor and the second end of the voltage stabilizer are grounded.
7. The charging head circuit capable of automatically switching charging voltage according to claim 6, wherein the delay control module further comprises a first resistor, a second capacitor, a timer, a second switch tube, a fourth resistor, a third capacitor, a second resistor, and a first switch tube;
the one end of first resistance, the first end of timer and the collecting electrode of second switch tube are all connected the third end of stabiliser, the second end and the sixth end of timer are connected to the other end of first resistance and are connected the ground end through second electric capacity, and the first end of timer, the projecting pole and the ground end of first switch tube are connected through the third electric capacity to the fifth end of timer, and the eighth end of timer is connected the projecting pole of second switch tube, the base of second switch tube pass through fourth resistance connection the output of inverting terminal, the third end of timer passes through the base of second resistance connection first switch tube, and the collecting electrode of first switch tube is connected the first end of first opto-coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852327.6A CN115207889A (en) | 2022-07-19 | 2022-07-19 | Charging head circuit capable of automatically switching charging voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852327.6A CN115207889A (en) | 2022-07-19 | 2022-07-19 | Charging head circuit capable of automatically switching charging voltage |
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| Publication Number | Publication Date |
|---|---|
| CN115207889A true CN115207889A (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210852327.6A Withdrawn CN115207889A (en) | 2022-07-19 | 2022-07-19 | Charging head circuit capable of automatically switching charging voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115657573A (en) * | 2022-12-28 | 2023-01-31 | 济钢防务技术有限公司 | Low-altitude flight body identification controller |
-
2022
- 2022-07-19 CN CN202210852327.6A patent/CN115207889A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115657573A (en) * | 2022-12-28 | 2023-01-31 | 济钢防务技术有限公司 | Low-altitude flight body identification controller |
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Application publication date: 20221018 |
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