CN113890161A - Charging circuit and charger - Google Patents
Charging circuit and charger Download PDFInfo
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- CN113890161A CN113890161A CN202111149618.0A CN202111149618A CN113890161A CN 113890161 A CN113890161 A CN 113890161A CN 202111149618 A CN202111149618 A CN 202111149618A CN 113890161 A CN113890161 A CN 113890161A
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- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 51
- 238000001914 filtration Methods 0.000 claims description 15
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
- H02J7/0032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits disconnection of loads if battery is not under charge, e.g. in vehicle if engine is not running
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of electronics, in particular to a charging circuit and a charger. The charging circuit includes a current input; the rectifying module is electrically connected with the current input end; the circuit switching module is electrically connected with the rectifying module; the detection module is electrically connected with the circuit switching module; the current output end is electrically connected with the detection module, the current value in the charging circuit is sampled and detected through the detection module, the further circuit switching module performs circuit cut-off or circuit connection action on the current in the rectifying module according to the sampling and detecting result, and then the automatic power-off of the charging circuit in a standby state is realized, so that the energy consumption is avoided, and meanwhile, the protection of the electronic equipment is effectively improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a charging circuit and a charger.
Background
The charger is a charging device which adopts a high-frequency power supply technology and applies an advanced intelligent dynamic adjustment charging technology, and is widely applied to electronic devices such as mobile phones, notebook computers, portable electric tools and the like. Traditional charger is after inserting external power supply, all can carry out actions such as charging detection under the circumstances of not connecting electronic equipment usually, and the user is not just taking off the charger from supply socket once being full of the electricity when charging simultaneously, can cause the waste of electric energy like this to the charger is in the on state for a long time and can make electronic equipment be in fatigue for a long time, causes electronic equipment to be frequently charged many times easily, shortens the life of product battery.
Disclosure of Invention
The invention provides a charging circuit, which is used for solving the technical problem that a charger in the prior art cannot automatically power off in a standby state.
To solve the above problem, in a first aspect, the present invention provides a charging circuit, including:
the current input end is used for inputting current after being electrically connected with an external power supply;
the rectifying module is electrically connected with the current input end and is used for rectifying the input current;
the circuit switching module is electrically connected with the rectifying module and is used for carrying out circuit disconnection or circuit connection processing on the charging circuit;
the detection module is electrically connected with the circuit switching module and is used for detecting whether the current in the charging circuit is lower than a set value or not, when the current value in the charging circuit is lower than the set value, the circuit switching module performs circuit cut-off on the charging circuit, and when the current value in the charging circuit is higher than or equal to the set value, the circuit switching module keeps the circuit connection of the charging circuit;
and the current output end is electrically connected with the detection module and is used for outputting current after the current output end is electrically connected with electric equipment.
According to the first aspect, in one possible implementation manner, the circuit switching module includes a first control unit U1, a resistor R1, a resistor R2, a resistor R6, a resistor R7, a reset switch S1, a TVS tube ZD1 and a MOS tube, one end of the resistor R1 is electrically connected to the rectifying module, the other end of the resistor R1 is electrically connected to one end of the TVS tube ZD1, the other end of the TVS tube ZD1 is electrically connected with the MOS tube, the MOS tube is electrically connected with the first control unit U1, the MOS tube is electrically connected with one end of the resistor R2, the other end of the resistor R2 is electrically connected with the reset switch S1, the reset switch S1 is electrically connected with the first control unit U1, the resistor R6 is connected in parallel with the resistor R7, one end of the resistor R6 is electrically connected with the first control unit U1, and the other end of the resistor R6 is electrically connected with the current output end.
According to the first aspect, in a possible implementation manner, the detection module includes a sampling circuit and a detection circuit, the sampling circuit includes a second control unit U2, a resistor R5, a resistor R8, a resistor R16, and a capacitor C3, one end of the resistor R8 is electrically connected to the rectification module, the other end of the resistor R8 is electrically connected to the circuit switching module, one end of the resistor R5 is electrically connected to the circuit switching module, the other end of the resistor R5 is electrically connected to the second control unit U2, the capacitor C3 is connected in parallel to the resistor R5, one end of the resistor R16 is electrically connected to the second control unit U2, the other end of the resistor R16 is electrically connected to the detection circuit, and the detection circuit is electrically connected to the current output terminal.
In a possible implementation form according to the first aspect, the detection circuit comprises a third control unit U3, a resistor R12, a resistor R13, a resistor R20, a resistor R21 and a capacitor C4, the third control unit U3 is electrically connected with the second control unit U2, one end of the resistor R20 is electrically connected with the current output terminal, the other end of the resistor R20 is electrically connected with the third control unit U3, one end of the resistor R21 is electrically connected with the current output terminal, the other end of the resistor R21 is electrically connected with the third control unit U3, one end of the resistor R13 is electrically connected with the current output terminal, the other end of the resistor R13 is electrically connected with the third control unit U3, one end of the resistor R12 is electrically connected with the resistor R20, the other end of the resistor R12 is electrically connected to one end of the capacitor C4, and the other end of the capacitor C4 is electrically connected to the third control unit U3 and the current output terminal, respectively.
According to the first aspect, in a possible implementation, the rectifier module includes rectifier bridge DB1, filter capacitor EC1, filter capacitor EC2 and EMC inductor, rectifier bridge DB1 includes pin 1, pin 2, pin 3 and pin 4, pin 1 with pin 3 all with the current input end electricity is connected, EMC inductor's one end respectively with filter capacitor EC 1's one end with pin 4 electricity is connected, EMC inductor's the other end respectively with filter capacitor EC 2's one end with the circuit switching module electricity is connected, filter capacitor EC 1's the other end respectively with filter capacitor EC 2's the other end with pin 2 electricity is connected.
According to the first aspect, in a possible implementation manner, the charging circuit further includes a filtering module, one end of the filtering module is electrically connected to the rectifying module and the circuit switching module, and the other end of the filtering circuit is electrically connected to the current output terminal, and the filtering module can convert the alternating current transmitted by the rectifying module into a direct current and then output the direct current to the current output terminal.
In a possible implementation form according to the first aspect, the filtering module includes a transformer, a resistor R10, a resistor R11, a resistor R22, a filter capacitor EC4, a filter capacitor EC5, a diode D1, and a diode D4, one end of the resistor R11 is electrically connected with the rectifying module, the other end of the resistor R11 is electrically connected with the input end of the transformer, the resistor R10, the resistor R11 and the diode D1 are sequentially connected in series, the diode D1 is electrically connected with the input end of the transformer, the resistor R22, the filter capacitor EC4 and the filter capacitor EC5 are connected in parallel with each other, one end of the diode D4 is electrically connected with the output end of the transformer, the other end of the diode D4 is electrically connected with one end of the filter capacitor EC4 and the current output end respectively, the other end of the filter capacitor EC4 is electrically connected with the output end of the transformer and the current output end respectively.
In a second aspect, the present invention further provides a charger, including the charging circuit described above.
The invention has the beneficial effects that: the invention provides a charging circuit, which comprises a current input end, a rectifying module, a circuit switching module, a detection module and a current output end, wherein when current is input from the current input end, the current in the charging circuit is sampled and detected through the detection module, the sampling and detection result is further transmitted to the circuit switching module, and then the circuit switching module performs circuit disconnection or circuit connection action on the current in the rectifying module according to the sampling and detection result, so that automatic power failure of the charging circuit in a standby state can be realized, the energy consumption is avoided, and meanwhile, the protection of electronic equipment is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a control flow diagram of a charging circuit;
fig. 2 shows a schematic diagram of the overall circuit of the charging circuit.
Description of the main element symbols:
100-current input; 200-a rectifying module; 300-a circuit switching module; 400-a detection module; 410-a sampling circuit; 420-a detection circuit; 500-a filtering module; 600-current output terminal.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1 and 2, the present invention provides a charging circuit, which is used to solve the problems of energy loss caused by continuous power-on of the charging circuit and shortened service life of an electronic device due to repeated charging of the electronic device easily when a charger is in a standby state in the prior art, and includes a current input terminal 100, a rectifying module 200, a circuit switching module 300, a detecting module 400, and a current output terminal 600, wherein the rectifying module 200 is used to rectify a current input into the charging circuit, the circuit switching module 300 is used to perform circuit disconnection or circuit connection processing on the charging circuit, and the detecting module 400 is used to detect a current output from the charging circuit.
Specifically, the current input terminal 100 is electrically connected to the rectifying module 200, the rectifying module 200 is electrically connected to the circuit switching module 300 and the current output terminal 600, and the detecting module 400 is electrically connected to the circuit switching module 300 and the current output terminal 600.
The detection module 400 is set with a preset value, when the detection module 400 detects the current value in the charging circuit and the detected current value is smaller than the preset value, the detection module 400 feeds back to the circuit switching module 300, and the circuit switching module 300 further performs circuit switching-off processing on the charging circuit, so that the charging circuit is automatically switched off, the circuit of the charging circuit in a standby state is switched off, and energy consumption of the charging circuit in the standby state is effectively avoided.
When the charging circuit charges the electronic device, after the electronic device is fully charged, the detection module 400 detects that the current value in the charging circuit is smaller than the preset value, and the further circuit switching module 300 performs circuit switching-off processing on the charging circuit, so that the phenomenon that the battery of the electronic device is damaged due to repeated charging of the charging circuit on the electronic device is avoided, the charging protection on the electronic device is effectively improved, and the service life of the electronic device is greatly prolonged.
When the detection module 400 detects that the current value in the charging circuit is greater than or equal to the preset value, it indicates that the electronic device is being charged, and the circuit switching module 300 continues to keep the circuit of the charging circuit connected.
Preferably, the circuit switching module 300 includes a first control unit U1, a resistor R1, a resistor R2, a resistor R6, a resistor R7, a reset switch S1, a TVS tube ZD1 and a MOS, wherein one end of the resistor R1 is electrically connected to the rectifying module 200, the other end of the resistor R1 is electrically connected to one end of the TVS tube ZD1, the other end of the TVS tube ZD1 is electrically connected to the MOS, the MOS is electrically connected to the first control unit U1, the MOS is electrically connected to one end of the resistor R2, the other end of the resistor R2 is electrically connected to the reset switch S1, the reset switch S1 is electrically connected to the first control unit U1, the resistor R6 is electrically connected to the resistor R7 in parallel, one end of the resistor R6 is electrically connected to the first control unit U1, and the other end of the resistor R6 is electrically connected to the current output terminal 600.
In the technical scheme of the invention, after the circuit switching module 300 performs circuit cut-off on the charging circuit, the charging circuit is switched off, and when the electronic equipment needs to be charged again, the charging circuit can be switched on again only by triggering the reset switch S1, so that the use convenience of the charging circuit is greatly improved.
Referring to fig. 2, preferably, the rectifier module includes a rectifier bridge DB1, a filter capacitor EC1, a filter capacitor EC2, and an EMC inductor, the rectifier bridge DB1 includes a pin 1, a pin 2, a pin 3, and a pin 4, where the pin 1 and the pin 3 are electrically connected to the current input terminal 600, one end of the EMC inductor is electrically connected to one end of the filter capacitor EC1 and the pin 4, the other end of the EMC inductor is electrically connected to one end of the filter capacitor EC2 and the circuit switching module 300, and the other end of the filter capacitor EC1 is electrically connected to the other end of the filter capacitor EC2 and the pin 2.
Referring to fig. 1 and fig. 2, the detecting module 400 includes a sampling circuit 410 and a detecting circuit 420, the sampling circuit 410 electrically connects the rectifying module 200 and the current output terminal 600 to the circuit switching module 300, the sampling circuit 410 is used for sampling a current value in the charging circuit, and the detecting circuit 420 electrically connects the current output terminal 600 to the circuit switching module 300 for detecting the current value output by the current output terminal 600.
Preferably, the sampling circuit 410 includes a second control unit U2, a resistor R5, a resistor R8, a resistor R16, and a capacitor C3, wherein one end of the resistor R8 is electrically connected to the rectifying module 200, the other end of the resistor R8 is electrically connected to the circuit switching module 300, one end of the resistor R5 is electrically connected to the circuit switching module 300, the other end of the resistor R5 is electrically connected to the second control unit U2, the capacitor C3 is connected to the resistor R5 in parallel, one end of the resistor R16 is electrically connected to the second control unit U2, the other end of the resistor R16 is electrically connected to the detection circuit 420, and the detection circuit 420 is electrically connected to the current output terminal 600.
The current value in the rectifier module 200 is further transmitted to the circuit switching module 300 through the sampling circuit 410, and the current value of the current output terminal 600 is also transmitted to the circuit switching module 300, and the circuit switching module 300 compares the currents from the rectifier module 200 and the current output terminal 600, i.e. the sampling process is completed.
Preferably, the detection circuit 420 includes a third control unit U3, a resistor R12, a resistor R13, a resistor R20, a resistor R21 and a capacitor C4, the third control unit U3 is electrically connected to the second control unit U2, one end of the resistor R20 is electrically connected to the current output terminal 600, the other end of the resistor R20 is electrically connected to the third control unit U3, one end of the resistor R21 is electrically connected to the current output terminal 600, the other end of the resistor R21 is electrically connected to the third control unit U3, one end of the resistor R13 is electrically connected to the current output terminal 600, the other end of the resistor R13 is electrically connected to the third control unit U3, one end of the resistor R12 is electrically connected to the resistor R20, the other end of the resistor R12 is electrically connected to one end of the capacitor C4, and the other end of the capacitor C4 is electrically connected to the third control unit U3 and the current output terminal 600, respectively.
Referring to fig. 1 and fig. 2, the charging circuit further includes a filtering module 500, one end of the filtering module 500 is electrically connected to the rectifying module 200 and the circuit switching module 300, respectively, and the other end of the filtering circuit 500 is electrically connected to the current output end 600, the filtering module 500 can convert the ac power transmitted by the rectifying module 200 into dc power and then output the dc power to the current output end 600, and the filtering circuit 500 can filter out the redundant ac power, thereby improving the stability of the charging circuit during output.
Specifically, the filter module comprises a transformer, a resistor R10, a resistor R11, a resistor R22, a filter capacitor EC4, a filter capacitor EC5, a diode D1 and a diode D4, wherein one end of the resistor R11 is electrically connected with the rectifier module 200, the other end of the resistor R11 is electrically connected with an input end of the transformer, the resistor R10, the resistor R11 and the diode D1 are sequentially connected in series, the diode D1 is electrically connected with the input end of the transformer, the resistor R22, the filter capacitor EC4 and the filter capacitor EC5 are connected in parallel, one end of the diode D4 is electrically connected with an output end of the transformer, the other end of the diode D4 is electrically connected with one end of the filter capacitor EC4 and the current output end 600, and the other end of the filter capacitor EC4 is electrically connected with the output end of the transformer and the current output end 600.
Referring to fig. 2, it is preferable that the first control unit U1 is a control chip with a model G1138, the second control unit U2 is a control chip with a model PC817, and the third control unit U3 is a control chip with a model PU7358, which are all in the existing mature technologies and therefore are not described in detail.
The invention also provides a charger which comprises the charging circuit.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A charging circuit, comprising:
the current input end is used for inputting current after being electrically connected with an external power supply;
the rectifying module is electrically connected with the current input end and is used for rectifying the input current;
the circuit switching module is electrically connected with the rectifying module and is used for carrying out circuit disconnection or circuit connection processing on the charging circuit;
the detection module is electrically connected with the circuit switching module and is used for detecting whether the current in the charging circuit is lower than a set value or not, when the current value in the charging circuit is lower than the set value, the circuit switching module performs circuit cut-off on the charging circuit, and when the current value in the charging circuit is higher than or equal to the set value, the circuit switching module keeps the circuit connection of the charging circuit;
and the current output end is electrically connected with the detection module and is used for outputting current after the current output end is electrically connected with electric equipment.
2. The charging circuit of claim 1, wherein the circuit switching module comprises a first control unit U1, a resistor R1, a resistor R2, a resistor R6, a resistor R7, a reset switch S1, a TVS tube ZD1 and a MOS tube, one end of the resistor R1 is electrically connected to the rectifying module, the other end of the resistor R1 is electrically connected to one end of the TVS tube ZD1, the other end of the TVS tube ZD1 is electrically connected with the MOS tube, the MOS tube is electrically connected with the first control unit U1, the MOS tube is electrically connected with one end of the resistor R2, the other end of the resistor R2 is electrically connected with the reset switch S1, the reset switch S1 is electrically connected with the first control unit U1, the resistor R6 is connected in parallel with the resistor R7, one end of the resistor R6 is electrically connected with the first control unit U1, and the other end of the resistor R6 is electrically connected with the current output end.
3. The charging circuit of claim 1, wherein the detection module comprises a sampling circuit and a detection circuit, the sampling circuit comprises a second control unit U2, a resistor R5, a resistor R8, a resistor R16 and a capacitor C3, one end of the resistor R8 is electrically connected to the rectifying module, the other end of the resistor R8 is electrically connected to the circuit switching module, one end of the resistor R5 is electrically connected to the circuit switching module, the other end of the resistor R5 is electrically connected to the second control unit U2, the capacitor C3 is connected in parallel to the resistor R5, one end of the resistor R16 is electrically connected to the second control unit U2, the other end of the resistor R16 is electrically connected to the detection circuit, and the detection circuit is electrically connected to the current output terminal.
4. The charging circuit of claim 3, wherein the detection circuit comprises a third control unit U3, a resistor R12, a resistor R13, a resistor R20, a resistor R21 and a capacitor C4, the third control unit U3 is electrically connected with the second control unit U2, one end of the resistor R20 is electrically connected with the current output terminal, the other end of the resistor R20 is electrically connected with the third control unit U3, one end of the resistor R21 is electrically connected with the current output terminal, the other end of the resistor R21 is electrically connected with the third control unit U3, one end of the resistor R13 is electrically connected with the current output terminal, the other end of the resistor R13 is electrically connected with the third control unit U3, one end of the resistor R12 is electrically connected with the resistor R20, the other end of the resistor R12 is electrically connected to one end of the capacitor C4, and the other end of the capacitor C4 is electrically connected to the third control unit U3 and the current output terminal, respectively.
5. The charging circuit of claim 1, wherein the rectifying module comprises a rectifying bridge DB1, a filter capacitor EC1, a filter capacitor EC2 and an EMC inductor, the rectifying bridge DB1 comprises a pin 1, a pin 2, a pin 3 and a pin 4, the pin 1 and the pin 3 are electrically connected to the current input terminal, one end of the EMC inductor is electrically connected to one end of the filter capacitor EC1 and the pin 4, respectively, the other end of the EMC inductor is electrically connected to one end of the filter capacitor EC2 and the circuit switching module, respectively, and the other end of the filter capacitor EC1 is electrically connected to the other end of the filter capacitor EC2 and the pin 2, respectively.
6. The charging circuit according to claim 1, further comprising a filtering module, wherein one end of the filtering module is electrically connected to the rectifying module and the circuit switching module, respectively, and the other end of the filtering circuit is electrically connected to the current output terminal, and the filtering module is capable of converting an alternating current transmitted by the rectifying module into a direct current and outputting the direct current to the current output terminal.
7. The charging circuit of claim 6, wherein the filter module comprises a transformer, a resistor R10, a resistor R11, a resistor R22, a filter capacitor EC4, a filter capacitor EC5, a diode D1, and a diode D4, one end of the resistor R11 is electrically connected with the rectifying module, the other end of the resistor R11 is electrically connected with the input end of the transformer, the resistor R10, the resistor R11 and the diode D1 are sequentially connected in series, the diode D1 is electrically connected with the input end of the transformer, the resistor R22, the filter capacitor EC4 and the filter capacitor EC5 are connected in parallel with each other, one end of the diode D4 is electrically connected with the output end of the transformer, the other end of the diode D4 is electrically connected with one end of the filter capacitor EC4 and the current output end respectively, the other end of the filter capacitor EC4 is electrically connected with the output end of the transformer and the current output end respectively.
8. A charger, characterized by comprising a charging circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111149618.0A CN113890161A (en) | 2021-09-29 | 2021-09-29 | Charging circuit and charger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111149618.0A CN113890161A (en) | 2021-09-29 | 2021-09-29 | Charging circuit and charger |
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| CN113890161A true CN113890161A (en) | 2022-01-04 |
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