CN215772585U - Charging circuit - Google Patents
Charging circuit Download PDFInfo
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- CN215772585U CN215772585U CN202121527448.0U CN202121527448U CN215772585U CN 215772585 U CN215772585 U CN 215772585U CN 202121527448 U CN202121527448 U CN 202121527448U CN 215772585 U CN215772585 U CN 215772585U
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Abstract
The utility model discloses a charging circuit, comprising: the power supply output interface is used for connecting a battery, the input end of the first switch module is connected with the power supply input interface, and the output end of the first switch module is connected with the power supply output interface; the first end of the switch selection module is connected with the power input interface, the second end of the switch selection module is connected with the power output interface, and the third end of the switch selection module is connected with the input end of the second switch module; the output end of the second switch module is connected with the power output interface; when the power supply supplies power abnormally, the switch selection module is switched to a non-charging state, the first switch module is closed, the second switch module is opened, and a channel between the power supply and the electronic equipment is disconnected to prevent electric leakage. The charging circuit can avoid the electric leakage phenomenon when the battery reversely charges the disconnected power input interface.
Description
Technical Field
The utility model relates to a charging circuit, and belongs to the technical field of electronics.
Background
The charging circuit is a commonly used functional module for charging electronic equipment, and generally comprises a power supply and necessary control circuits for constant current, voltage limitation, time limitation and the like. The charging circuit may be connected to a power source via a power input interface and then to an electronic device via a power output interface. Under the condition that the power supply can normally supply power, the power output interface can charge the battery of the electronic equipment, but when the power input interface is powered off, the electric quantity of the battery of the electronic equipment can be reversely output from the power output interface to the power input interface, and a leakage phenomenon is generated.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a charging circuit which is used for solving the problem that a battery of electronic equipment generates a leakage phenomenon when a power input interface is powered off.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a charging circuit comprises a power input interface used for connecting a power supply, a power output interface used for connecting a battery, a first switch module, a second switch module and a switch selection module;
the input end of the first switch module is connected with the power input interface, and the output end of the first switch module is connected with the power output interface;
the first end of the switch selection module is connected with the power input interface, the second end of the switch selection module is connected with the power output interface, and the third end of the switch selection module is connected with the input end of the second switch module;
the output end of the second switch module is connected with the power output interface;
when the power supply supplies power abnormally, the switch selection module is switched to a non-charging state, the first switch module is closed, the second switch module is opened, and a channel between the power supply and the electronic equipment is disconnected to prevent electric leakage.
Preferably, when the power supply supplies power normally, the switch selection module is switched to a charging state, the first switch module is turned on, the second switch module is turned off, and the power supply charges the battery through the power input interface, the first switch module and the power output interface.
Preferably, the method further comprises the following steps: the voltage detection interface is connected with the power output interface, and the control interface is connected with the control end of the second switch module;
the voltage detection interface detects the voltage of the power output interface;
the control interface outputs control voltage to the control end of the second switch module, the control end of the second switch module receives the control voltage and switches to a conducting state, the voltage output by the input end of the second switch module enables the switch selection module to switch to a non-charging state, the first switch module is switched to be closed, and a path between the power supply and the electronic equipment is disconnected to prevent electric leakage.
Preferably, the first switch module comprises a first switch element and a second switch element;
wherein a first pole of the first switching element is connected to the power input interface; a third pole of the second switching element is connected with the power output interface;
the second pole of the first switching element and the second pole of the second switching element are both connected with the second switching module;
the third pole of the first switching element is connected to the first pole of the second switching element.
Preferably, the second switch module comprises a third switch element and a fourth switch element;
a first pole of the third switching element is used as an input end of the second switching module; a first pole of the fourth switching element is used as an output end of the second switching module;
a second pole of the third switching element and a second pole of the fourth switching element are both connected to the control interface and serve as control ends of the second switching module;
a third pole of the third switching element is connected to the second pole of the first switching element;
a third pole of the fourth switching element is connected to the second pole of the second switching element.
Preferably, the switch selection module comprises a first selection element and a second selection element;
a first pole of the first selection element is connected with a second pole of the second selection element to serve as a first end of the switch selection module;
a second pole of the second selection element is connected with the first pole of the first selection element to serve as a second end of the switch selection module;
a third pole of the first selection element and a third pole of the second selection element are connected as a third end of the switch selection module.
Preferably, the switch selection module further comprises a third selection element;
the first pole of the third selection element is connected with the first end of the switch selection module, and the second pole and the third pole are both connected with the third end of the switch selection module.
Preferably, the switching element and/or the selection element is a P-type field effect transistor or an N-type field effect transistor.
In the charging circuit provided by the utility model, the input end of the first switch module is connected with the power input interface, and the output end of the first switch module is connected with the power output interface. The first end of the switch selection module is connected with the power input interface, the second end of the switch selection module is connected with the power output interface, and the third end of the switch selection module is connected with the input end of the second switch. The switch selection module can then select the voltage of the power input interface or the power output interface to control the first switch module or the second switch module to be switched on or switched off. The output end of the second switch module is connected with the power output interface, when the power supply supplies power abnormally, the switch selection module is switched to a non-charging state, the first switch module is closed, and the second switch module opens a path between the power supply and the electronic equipment to be disconnected, so that electric leakage is prevented. The first switch module is controlled to be turned off or turned on, so that a path between the power output interface and the power input interface is cut off, the electric leakage phenomenon is avoided, the electric quantity of the battery is protected, and the charging efficiency is improved.
Drawings
FIG. 1 is a circuit schematic of one embodiment of a charging circuit provided by the present invention;
FIG. 2 is a circuit schematic of yet another embodiment of a charging circuit provided by the present invention;
FIG. 3 is a circuit schematic of yet another embodiment of a charging circuit provided by the present invention;
FIG. 4 is a circuit schematic of yet another embodiment of a charging circuit provided by the present invention;
FIG. 5 is a circuit schematic of yet another embodiment of a charging circuit provided by the present invention;
fig. 6 is a schematic circuit diagram of a charging circuit according to another embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As mentioned above, the power supply in the prior art is usually directly connected to the battery of the power output interface through the power input interface, and when the power supply is powered down, the battery will transmit voltage to the power input interface through the power output interface, which results in the occurrence of leakage of the battery.
In order to solve the problem, the present invention provides a charging circuit of a new design. The charging circuit can comprise a power input interface used for connecting a power supply, a power output interface used for connecting a battery, a first switch module, a second switch module and a switch selection module. The input end of the first switch module is connected with the power input interface, and the output end of the first switch module is connected with the power output interface. The first end of the switch selection module is connected with the power input interface, the second end of the switch selection module is connected with the power output interface, and the third end of the switch selection module is connected with the input end of the second switch. The switch selection module can then select the voltage of the power input interface or the power output interface to control the first switch module or the second switch module to be switched on or switched off. The output end of the second switch module is connected with the power output interface, when the power supply supplies power normally, the switch selection module is switched to a charging state, the first switch module is turned on, the second switch module is turned off, and at the moment, the power supply charges the battery through the power input interface, the first switch module and the power output interface, so that the battery is in a normal charging state. When the power supply supplies power abnormally, the switch selection module is switched to a non-charging state, the first switch module is closed, and the second switch module opens a path between the power supply and the electronic equipment to be disconnected, so that electric leakage is prevented. The first switch module is controlled to be turned off or turned on, so that a path between the power output interface and the power input interface is cut off, the electric leakage phenomenon is avoided, the electric quantity of the battery is protected, and the charging efficiency is improved.
Fig. 1 is a schematic circuit diagram of a charging circuit according to an embodiment of the present invention. The charging circuit may include: a power input interface 101 for connecting a power supply and a power output interface 102 for connecting a battery, a first switch module 103, a second switch module 104 and a switch selection module 105.
The input end of the first switch module 103 is connected to the power input interface 101, and the output end is connected to the power output interface 102.
The switch selection module 105 has a first terminal connected to the power input interface 101, a second terminal connected to the power output interface 102, and a third terminal connected to the input terminal of the second switch module 104.
The output of the second switch module 104 is connected to the power output interface 102.
When the power supply is abnormally powered, the switch selection module 105 is switched to a non-charging state, the first switch module 103 is closed, the second switch module 104 is opened, and a path between the power supply and the electronic device is disconnected to prevent electric leakage.
In some embodiments, when the power supply is supplying power normally, the switch selection module 105 switches to a charging state, the first switch module 103 is turned on and the second switch module 104 is turned off, and the power supply charges the battery through the power input interface 101, the first switch module 103 and the power output interface 102.
The charging circuit provided by the embodiment of the utility model can comprise a power input interface used for connecting a power supply, a power output interface used for connecting a battery, a first switch module, a second switch module and a switch selection module. The input end of the first switch module is connected with the power input interface, and the output end of the first switch module is connected with the power output interface. The first end of the switch selection module is connected with the power input interface, the second end of the switch selection module is connected with the power output interface, and the third end of the switch selection module is connected with the input end of the second switch. The switch selection module can then select the voltage of the power input interface or the power output interface to control the first switch module or the second switch module to be switched on or switched off. The output end of the second switch module is connected with the power output interface, when the power supply supplies power normally, the switch selection module is switched to a charging state, the first switch module is turned on, the second switch module is turned off, and at the moment, the power supply charges the battery through the power input interface, the first switch module and the power output interface, so that the battery is in a normal charging state. When the power supply supplies power abnormally, the switch selection module is switched to a non-charging state, the first switch module is closed, and the second switch module opens a path between the power supply and the electronic equipment to be disconnected, so that electric leakage is prevented. The first switch module is controlled to be turned off or turned on, so that a path between the power output interface and the power input interface is cut off, the electric leakage phenomenon is avoided, the electric quantity of the battery is protected, and the charging efficiency is improved.
Fig. 2 is a schematic circuit diagram of a charging circuit according to another embodiment of the present invention. The difference from the embodiment shown in fig. 1 is that the charging circuit may further include: a voltage detection interface 201 connected with the power output interface 102 and a control interface 202 connected with the control end of the second switch module 104.
The voltage detection interface 201 detects the voltage of the power output interface 102.
The control interface 202 outputs a control voltage to the control terminal of the second switch module 104. The control terminal of the second switch module 104 receives the control voltage and switches to the conducting state, and the voltage output by the input terminal of the second switch module 104 switches the switch selection module 105 to the non-charging state. The first switch module 103 is switched off, and the path between the power supply and the electronic device is disconnected, thereby preventing electric leakage.
The voltage detection interface can be connected with a voltage detection module, and the voltage detection module can detect the voltage of the power output interface through the voltage detection interface.
In addition, the voltage detection module can be connected with a processor or a control module, the processor or the control module obtains the voltage at the voltage detection interface, and when the voltage is judged to be smaller than the preset voltage threshold value, the power supply can be determined to stop supplying power. At this moment, the control interface connected with the processor or the control module can output control voltage to control the second switch module to be conducted, so that the element of the switch selection module is switched to cut off the path between the power output interface and the power input interface, and the first switch module is controlled to be switched to the off state, at this moment, the path between the power supply and the electronic equipment is disconnected, and the electric leakage is prevented.
When the power supply is normally charged, the first switch module is switched on, and the power supply of the power supply input interface can charge the electronic equipment of the power supply output interface.
In practical applications, the electronic device may be, for example, a mobile phone, a tablet computer, a notebook, a wearable device, an intelligent terminal, and the like, and the specific type of the electronic device is not limited in the present invention.
As an embodiment, the first switch module 103 may include: a first switching element and a second switching element.
The first pole of the first switch element is connected with the power input interface; and the third pole of the second switch element is connected with the power output interface.
The second pole of the first switch element and the second pole of the second switch element are both connected with the second switch module.
The third pole of the first switching element is connected to the first pole of the second switching element.
The second poles of the first switch element and the second switch element are connected with the second switch module, so that the first switch element and the second switch element are switched to be closed under the influence of the second switch module and the switch selection module, a connection path between the power supply and the battery is disconnected, and electric leakage is prevented.
The first pole of the first switch element is used as the input end of the first switch module and is connected with the power input interface. And the third pole of the second switch element is used as the output end of the first switch module and is connected with the power output interface.
When the first switch module is provided with the two switch elements, the normal conduction of a circuit between the power output interface and the power input interface can be ensured, the voltage between the power output interface and the power input interface is the voltage of the two switch elements, and the stability of the circuit voltage is ensured. And when the switching element is a field effect transistor, the voltage of the two switching elements can be used for circuit protection when the power supply is suddenly cut off because the field effect transistor has voltage stability. For example, when the withstand voltage of a single switching element is 3V, the voltages of the two switching elements are 6V, and when power is suddenly cut off, the voltage between the power input interface and the power output interface is 6V in a short time, so that the circuit can be protected. After the two switch elements of the first switch module are completely powered off, the two switch elements cannot be conducted, and the reverse leakage phenomenon of the circuit can be avoided.
As still another embodiment, the second switching element 104 may include: a third switching element and a fourth switching element.
Wherein the first pole of the third switching element is used as the input terminal of the second switching element. A third pole of the fourth switching element serves as an output terminal of the second switching element.
The second pole of the third switch element and the second pole of the fourth switch element are both connected with the control interface and used as the control end of the second switch module.
The third pole of the third switching element is connected to the second pole of the first switching element. A third pole of the fourth switching element is connected to the second pole of the second switching element.
When the third pole of the fourth switching element is connected with the second pole of the second switching element, if the power supply is powered down, the voltage of the power input interface is 0, the third pole of the fourth switching element pulls the voltage of the second pole of the second switching element to the voltage of the power output interface, and the second switching element is cut off to prevent the power output interface from leaking electricity to the power input interface.
In one possible design, the first switching element, the second switching element, the third switching element and the fourth switching element are of the same type and are all P-type field effect transistors or N-type field effect transistors. When the switching element is a P-type field effect transistor, the first electrode is a source electrode, the second electrode is a grid electrode, and the third electrode is a drain electrode. Or, when the switching element is an N-type field effect transistor, the first electrode is a drain electrode, the second electrode is a gate electrode, and the third electrode is a source electrode.
For easy understanding, when the switching element is a P-type fet, as shown in fig. 3, a schematic circuit diagram of another embodiment of the charging circuit is shown.
The charging circuit may include: a power input interface 301 for connecting to a power source and a power output interface 302 for connecting to a battery. The first switching module includes a first switching element 303 and a second switching element 304. The second switch module includes: a third switching element 305, a fourth switching element 306, and a switch selection module 307.
A first pole of the first switching element 303 is connected as an input terminal to the power input interface 301, and a second pole of the second switching element 304 is connected as an output terminal to the power output interface 302.
The switch selection module 307 has a first terminal connected to the power input interface 301, a second terminal connected to the power output interface 302, and a third terminal connected to a first pole of the third switching element 305.
A first pole of the fourth switching element 306 is connected to the power output interface 302 as an output terminal of the second switching module.
The second pole of the first switching element is connected to the third pole of the third switching element.
The second pole of the second switching element is connected to the third pole of the fourth switching element.
The third pole of the first switching element is connected to the first pole of the second switching element.
The second pole of the third switching element and the second pole of the fourth switching element are both connected with the control interface and used as the control end of the second switching element.
In a possible design, the first switching element, the second switching element, the third switching element, the fourth switching element, the first selection element, the second selection element, and the third selection element may all be the same type of electronic element, such as P-type fet or N-type fet, or may be other triacs with on or off functions.
When the power supply supplies power normally, the switch selection module is switched to a charging state, the first switch element and the second switch element are switched on, the third switch element and the fourth switch element are switched off, and the power supply charges the battery through the power supply input interface, the first switch module and the power supply output interface.
When the power supply supplies power abnormally, the switch selection module is switched to a non-charging state, the first switch element and the second switch element are cut off, the third switch element and the fourth switch element are conducted, and a channel between the power supply and the electronic equipment is disconnected to prevent electric leakage.
Fig. 4 is a schematic circuit diagram of another embodiment of the charging circuit. The difference from the embodiment shown in fig. 1 is that the switch selection module of the charging circuit may include: a first selection element 401 and a second selection element 402.
A first pole of the first selection element 401 is connected to a second pole of the second selection element 402 as a first end of the switch selection module;
the second pole of the second selection element 402 is connected to the first pole of the first selection element 401 as the second terminal of the switch selection module;
a third pole of the first selection element 401 and a third pole of the second selection element 402 are connected as a third terminal of the switch selection module.
When the power input interface supplies power normally, the first selection element is disconnected, the second selection element is connected, the switch selection module is in a normal charging state, then the second switch module is disconnected, the first switch module is connected, the power supply normally supplies power to the power output interface through the power input interface, and the battery is charged.
When the power input interface supplies power abnormally, the first selection element is switched on, the second selection element is switched off, the switch selection module is in a non-charging state, then the second switch module is switched on, the first switch module is switched off, the power input interface is switched off from a channel of the power output interface, and the power supply of the power output interface is placed to leak electricity to the power input interface.
As a further embodiment, reference is made to fig. 5. The difference from fig. 4 is that the switch selection module may further include: a third selection element 501.
The first pole of the third selecting element 501 is connected to the first end of the switch selecting module, and the second pole and the third pole are both connected to the third end of the switch selecting module.
The third selection element is an auxiliary guide tube, and when the power supply is electrified, a circuit between the power supply output interface and the power supply input interface is protected.
For convenience of understanding, the following describes the technical solution of the present invention in detail by taking a P-type field effect transistor as an example of the switching element and the selection element. As shown in fig. 6, the charging circuit may include: a power input interface 601 for connecting a power supply and a power output interface 602 for connecting a battery. The power input interface is connected to the source of the first switching element 603. The power output interface is connected to the drain of the second switching element 604.
The gate of the first switching element 603 is connected to the drain of the third switching element 605, and the gate of the second switching element 604 is connected to the drain of the fourth switching element 606. The drain of the first switching element 603 is connected to the source of the second switching element 604. The gate of the third switching element 605 and the gate of the fourth switching element 606 are both connected to the control interface 611.
The source of the third switching element 605 is connected to the drain of the first selection element 607, the drain of the second selection element 608, the drain of the third selection element 609 and the source.
The source of the first selection element 607, the gate of the second selection element 608 and the source of the third selection element 609 are all connected to the power input interface 601. The gate of the first selection device 607 and the source of the second selection device 608 are both connected to the power output interface 602.
In addition, in some embodiments, the power output interface may also be connected to the voltage detection interface 610. The voltage detection interface 610 detects the voltage of the power output interface.
When the voltage detection interface detects that the voltage of the power output interface is smaller than the voltage threshold, the control interface 611 outputs the control voltage to the gates of the third switch element 605 and the fourth switch element 606, the third switch element 605 and the fourth switch element 606 are switched to the on state, and the gate outputs the voltage, so that the first switch element 603 and the second switch element 604 are switched to the off state, the source of the third switch element 605 controls the first selection element 607 to be turned on, the second selection element 608 is turned off, and the voltage between the power input interface 601 and the power output interface 602 is switched, thereby preventing the power output interface from outputting the voltage to the voltage input interface.
Compared with the prior art, the charging circuit is applied to a charging scene, and the two switch modules are controlled to be switched, so that the connection between the power supply and the battery is disconnected when electric leakage occurs, and the electric leakage phenomenon of the battery when the disconnected power supply input interface is reversely charged can be avoided.
The charging circuit provided by the present invention is explained in detail above. It will be apparent to those skilled in the art that any obvious modifications thereof can be made without departing from the spirit of the utility model, which infringes the patent right of the utility model and bears the corresponding legal responsibility.
Claims (9)
1. A charging circuit is characterized by comprising a power input interface used for connecting a power supply, a power output interface used for connecting a battery, a first switch module, a second switch module and a switch selection module;
the input end of the first switch module is connected with the power input interface, and the output end of the first switch module is connected with the power output interface;
the first end of the switch selection module is connected with the power input interface, the second end of the switch selection module is connected with the power output interface, and the third end of the switch selection module is connected with the input end of the second switch module;
the output end of the second switch module is connected with the power output interface;
when the power supply supplies power abnormally, the switch selection module is switched to a non-charging state, the first switch module is closed, the second switch module is opened, and a channel between the power supply and the electronic equipment is disconnected to prevent electric leakage.
2. The charging circuit of claim 1, further comprising:
when the power supply supplies power normally, the switch selection module is switched to a charging state, the first switch module is turned on, the second switch module is turned off, and the power supply charges the battery through the power input interface, the first switch module and the power output interface.
3. The charging circuit of claim 1, further comprising: the voltage detection interface is connected with the power output interface, and the control interface is connected with the control end of the second switch module;
the voltage detection interface detects the voltage of the power output interface;
the control interface outputs control voltage to the control end of the second switch module, the control end of the second switch module receives the control voltage and switches to a conducting state, the voltage output by the input end of the second switch module enables the switch selection module to switch to a non-charging state, the first switch module is switched to be closed, and a path between the power supply and the electronic equipment is disconnected to prevent electric leakage.
4. The charging circuit of claim 3, wherein the first switching module comprises:
a first switching element and a second switching element;
wherein a first pole of the first switching element is connected to the power input interface; a third pole of the second switching element is connected with the power output interface;
the second pole of the first switching element and the second pole of the second switching element are both connected with the second switching module;
the third pole of the first switching element is connected to the first pole of the second switching element.
5. The charging circuit of claim 4, wherein the second switching module comprises:
a third switching element and a fourth switching element;
a first pole of the third switching element is used as an input end of the second switching module; a first pole of the fourth switching element is used as an output end of the second switching module;
a second pole of the third switching element and a second pole of the fourth switching element are both connected to the control interface and serve as control ends of the second switching module;
a third pole of the third switching element is connected to the second pole of the first switching element;
a third pole of the fourth switching element is connected to the second pole of the second switching element.
6. A charging circuit as claimed in claim 4 or 5, characterized in that the switching element is a P-type field effect transistor or an N-type field effect transistor.
7. The charging circuit of claim 1, wherein the switch selection module comprises:
a first selection element and a second selection element;
a first pole of the first selection element is connected with a second pole of the second selection element to serve as a first end of the switch selection module;
a second pole of the second selection element is connected with the first pole of the first selection element to serve as a second end of the switch selection module;
a third pole of the first selection element and a third pole of the second selection element are connected as a third end of the switch selection module.
8. The charging circuit of claim 7, wherein the switch selection module further comprises: a third selection element;
the first pole of the third selection element is connected with the first end of the switch selection module, and the second pole and the third pole are both connected with the third end of the switch selection module.
9. A charging circuit as claimed in claim 7 or 8, characterized in that the selection element is a P-type field effect transistor or an N-type field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121527448.0U CN215772585U (en) | 2021-07-06 | 2021-07-06 | Charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121527448.0U CN215772585U (en) | 2021-07-06 | 2021-07-06 | Charging circuit |
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| CN215772585U true CN215772585U (en) | 2022-02-08 |
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| CN202121527448.0U Active CN215772585U (en) | 2021-07-06 | 2021-07-06 | Charging circuit |
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- 2021-07-06 CN CN202121527448.0U patent/CN215772585U/en active Active
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