CN219394443U - Charging protection circuit and electric equipment - Google Patents
Charging protection circuit and electric equipment Download PDFInfo
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- CN219394443U CN219394443U CN202222571779.5U CN202222571779U CN219394443U CN 219394443 U CN219394443 U CN 219394443U CN 202222571779 U CN202222571779 U CN 202222571779U CN 219394443 U CN219394443 U CN 219394443U
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The application discloses charge protection circuit and consumer, charge protection circuit includes input, output, resistance branch road, switch branch road, steady voltage branch road, negative pressure protection branch road and overcurrent protection branch road. The resistive branch generates a bias voltage based on the voltage of the input power source. The switching branch is responsive to the bias voltage to turn on the third and second ends of the switching branch to establish a connection between the input and output ends. When the voltage of the first end of the switching branch is larger than a first preset voltage, the voltage of the first end of the switching branch is clamped at the first preset voltage by the voltage stabilizing branch so as to clamp the voltage of the output end to be the first voltage. And when the voltage of the input end is negative, the negative pressure protection branch circuit guides current into the input end from the second end of the negative pressure protection branch circuit. And when the current of the input end of the overcurrent protection branch is larger than a first preset current, the connection between the input end and the switch branch is disconnected. By the mode, the charging protection function can be realized by adopting a circuit with lower cost.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a charging protection circuit and electric equipment.
Background
The USB charger supports hot plug and has flexible expansibility, so that the USB charger is widely applied to consumer electronics. However, due to the uneven quality level of the USB charger on the market, when an emergency situation of overvoltage occurs due to factors such as power grid interference signals, power grid power failure, or unstable power grid, the load connected with the USB charger may be damaged.
At present, when a USB charger is used for charging, an integrated chip is generally used for achieving the purpose of charging protection. Taking overvoltage protection as an example, the collected voltage is amplified through an operational amplifier integrated in the chip, and then related logic and judgment of the positive and negative poles of the input voltage are carried out through logic circuits such as a comparator, so that voltage monitoring in the charging process is realized, and the protection of a load when overvoltage occurs is ensured. The scheme of adopting the integrated chip to carry out charging protection effectively protects the load and is simpler for a developer to develop.
However, since integrated chip prices are generally high, they are not suitable for use in some products where cost control requirements are high.
Disclosure of Invention
The application aims at providing a charging protection circuit and electric equipment, and the application can adopt the lower circuit of cost to realize the charging protection function.
To achieve the above object, in a first aspect, the present application provides a charge protection circuit, including: the device comprises an input end, an output end, a resistor branch, a switch branch, a voltage stabilizing branch, a negative pressure protection branch and an overcurrent protection branch;
the input end is used for being connected with an input power supply, and the output end is used for being connected with a load;
a first end of the resistive branch is connected with a second end of the overcurrent protection branch, and the resistive branch is configured to generate a bias voltage based on the voltage of the input power supply;
a third end of the switching leg is connected to the first end of the resistive leg, a second end of the switching leg is connected to the output end, the first end of the switching leg is connected to the second end of the resistive leg, the switching leg is configured to turn on the third end and the second end of the switching leg in response to the bias voltage to establish a connection between the input end and the output end;
a voltage stabilizing branch having a first end connected to the first end of the switching branch, the voltage stabilizing branch being configured to clamp the voltage of the first end of the switching branch to a first preset voltage when the voltage of the first end of the switching branch is greater than the first preset voltage, so as to clamp the voltage of the output end to a first voltage, the first voltage being a difference between the first preset voltage and a conduction voltage drop of the switching branch
The first end of the negative pressure protection branch is connected with the second end of the overcurrent protection branch, the second end of the negative pressure protection branch is grounded, and the negative pressure protection branch is configured to guide current into the input end from the second end of the negative pressure protection branch when the voltage of the input end is negative pressure;
the first end of the overcurrent protection branch is connected with the input end, the second end of the overcurrent protection branch is connected with the third end of the switch branch, and the overcurrent protection branch is configured to disconnect the connection between the input end and the third end of the switch branch when the current of the input end is larger than a first preset current.
In an alternative manner, the resistor branch includes a first resistor, a first end of the first resistor is connected to the third end of the switch branch, and a second end of the first resistor is connected to the first end of the switch branch.
In an alternative mode, the switching branch circuit comprises a switching tube, a first end of the switching tube is connected with the first end of the voltage stabilizing branch circuit, a second end of the switching tube is connected with the output end, and a third end of the switching tube is connected with the second end of the overcurrent protection branch circuit.
In an alternative manner, the voltage stabilizing branch includes a voltage stabilizing diode, an anode of the voltage stabilizing diode is grounded, and a cathode of the voltage stabilizing diode is connected with the first end of the switch branch.
In an optional manner, the charging protection circuit further includes a first capacitor, a second capacitor, and a third capacitor;
the first end of the first capacitor is connected with the input end, the first end of the second capacitor is connected with the output end, the first end of the third capacitor is connected with the first end of the switch branch, and the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are grounded.
In an alternative manner, the negative pressure protection branch circuit comprises a first diode, an anode of the first diode is grounded, and a cathode of the first diode is connected with the second end of the overcurrent protection branch circuit.
In an alternative manner, the overcurrent protection branch includes a fuse, a first end of the fuse being connected to the input terminal, and a second end of the fuse being connected to the cathode of the first diode.
In an alternative way, the rated current of the fuse is smaller than the rated current of the first diode.
In a second aspect, the present application provides a powered device, including a charging protection circuit as described above.
The beneficial effects of this application are: the charging protection circuit provided by the application comprises an input end, an output end, a resistor branch, a switch branch, a voltage stabilizing branch, a negative pressure protection branch and an overcurrent protection branch. The input end is used for being connected with the input power supply, and the output end is used for being connected with the load. The resistor branch is connected with the input end and the switch branch respectively, and the switch branch is connected with the output end, the voltage stabilizing branch and the overcurrent protection branch respectively. The negative pressure protection branch is connected with the overcurrent protection branch. When the voltage of the input power supply is normal, the resistor branch circuit generates bias voltage based on the voltage of the input power supply, and the switch branch circuit responds to the bias voltage to conduct the third end and the second end of the switch branch circuit so as to establish connection between the input end and the output end, so that the input power supply can charge a load. If the voltage of the input power supply is overlarge, namely overvoltage occurs, the voltage of the first end of the switch branch is larger than a first preset voltage, and at the moment, the voltage stabilizing branch can clamp the voltage of the first end of the switch branch at the first preset voltage so as to clamp the voltage of the output end to be the first voltage, wherein the first voltage is the difference between the first preset voltage and the conduction voltage drop of the switch branch. Then, the conduction voltage drop of the switch branch is kept unchanged, and the voltage stabilizing branch is arranged to enable the first voltage to be smaller than the maximum voltage which can be born by the load, so that the first voltage can not cause load damage, and the overvoltage protection function is realized. If the current of the input power supply is overlarge, and the current of the input end is larger than the first preset current, the overcurrent protection branch circuit can disconnect the connection between the input end and the third end of the switch branch circuit, and the current of the input end does not flow into the charging protection circuit and the load any more, so that an overcurrent protection function is realized. If the voltage of the input end is negative voltage, the negative pressure protection branch is arranged to guide current into the input end from the second end of the negative pressure protection branch when the voltage of the input end is negative pressure, so that negative pressure protection is realized. In a comprehensive way, in the process of charging the load, overvoltage protection, overcurrent protection and negative pressure protection are realized, namely, the charging protection function is realized. Meanwhile, the charging protection circuit is realized through a simple circuit structure, and compared with the mode of adopting an integrated chip in the related art, the cost of components and parts required by the charging protection circuit is lower.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic structural diagram of a charging protection circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a charge protection circuit according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a charging protection circuit according to an embodiment of the present application. As shown in fig. 1, the charge protection circuit 100 includes an input terminal Vin, an output terminal Vout, a resistor branch 10, a switch branch 20, a voltage stabilizing branch 30, a negative voltage protection branch 40, and an overcurrent protection branch 50.
Wherein the input terminal Vin is for connection to the input power V1, and the output terminal Vout is for connection to the load 200. A first end of the resistive branch 10 is connected to a second end of the overcurrent protection branch 50. The third end of the switching leg 20 is connected to the first end of the resistive leg 10, the second end of the switching leg 20 is connected to the output end Vout, and the first end of the switching leg 20 is connected to the second end of the resistive leg 10. A first end of the voltage stabilizing branch 30 is connected to a first end of the switching branch 20. The first end of the negative pressure protection branch 40 is connected to the second end of the overcurrent protection branch 50, and the second end of the negative pressure protection branch 40 is grounded GND. The first end of the overcurrent protection branch 50 is connected to the input terminal Vin, and the second end of the overcurrent protection branch 50 is connected to the third end of the switching branch 20.
Specifically, the resistive branch 10 is configured to generate a bias voltage based on the voltage of the input power V1. The switching branch 20 is configured to conduct the third terminal and the second terminal of the switching branch 20 in response to a bias voltage to establish a connection between the input terminal Vin and the output terminal Vout. The voltage stabilizing branch 30 is configured to clamp the voltage at the first end of the switching branch 20 at a first preset voltage when the voltage at the first end of the switching branch 20 is greater than the first preset voltage, so as to clamp the voltage at the output end Vout to the first voltage, where the first voltage is a difference between the first preset voltage and the conduction voltage drop of the switching branch 20. The negative pressure protection branch 40 is configured to conduct current from the second end of the negative pressure protection branch 40 to the input terminal Vin when the voltage at the input terminal Vin is negative. The overcurrent protection branch 50 is configured to disconnect the connection between the input terminal Vin and the third terminal of the switching branch 20 when the current of the input terminal Vin is greater than a first preset current.
When a load needs to be charged, the input terminal Vin is connected to the input power V1. In turn, the resistive branch 10 generates a bias voltage based on the voltage of the input power V1, which bias voltage can turn on the switching branch 20. The third end and the second end of the switch branch 20 are connected, and the input power V1 sequentially passes through the input end Vin, the third end and the second end of the switch branch 20, and the output end Vout to supply power to the load 200, so as to charge the load 200.
In the process of charging the load, if the voltage of the input power V1 is too large (for example, the input power V1 is from the power grid, and the power grid is unstable and causes the voltage of the input power V1 to be too large), that is, when the overvoltage occurs, the voltage of the input power V1 acts on the first end of the switch branch 20 through the resistor branch 10, and at the same time, the voltage of the first end of the switch branch 20 is caused to be greater than the first preset voltage. At this time, the voltage stabilizing branch 30 can clamp the voltage at the first end of the switching branch 20 at a first preset voltage, so as to clamp the voltage at the output end Vout to the first voltage. The first voltage is a difference between the first preset voltage and the conduction voltage drop of the switch branch 20, and after the switch branch 20 is turned on, a voltage difference between the first end and the second end of the switch branch 20 (i.e. the conduction voltage drop of the switch branch 20) is kept unchanged, so that the first voltage is smaller than the maximum voltage that can be borne by the load 200 by setting the voltage stabilizing branch 30, and the first voltage will not cause damage to the load 200. Thereby, it is realized that the load 200 can be protected when overvoltage occurs during charging of the load 200.
Meanwhile, when the voltage at the input terminal Vin is a negative voltage due to the occurrence of the disturbance, if the generated current acts on the charge protection circuit 100 and the load 200, there is a risk of damaging the charge protection circuit 100 and the load 200. Therefore, by providing the negative pressure protection branch 40 to introduce current from the second end of the negative pressure protection branch 40 to the input end Vin when the voltage of the input end Vin is negative, it is achieved that the load 200 can be protected when the negative pressure occurs during the charging of the load 200.
In addition, the current at the input terminal Vin is greater than the first preset current, which may cause the charge protection circuit 100 and the load 200 to be damaged due to the excessive current. Therefore, by setting the overcurrent protection branch 50 to disconnect the connection between the input terminal Vin and the third terminal of the switch branch 20, i.e. disconnect the connection between the input power V1 and the third terminal of the switch branch 20, when the current of the input terminal Vin is greater than the first preset current, the current of the input terminal Vin no longer flows into the charge protection circuit 100 and the load 200. Thereby realizing protection of the load 200 when overcurrent occurs during charging of the load 200.
In summary, the function of protecting the load 200 in the case of overvoltage, overcurrent and negative pressure in the charging process is realized. Meanwhile, the charge protection circuit 100 of the present application is realized by a simple circuit structure, and the cost of components required in the present application is lower than that of the related art adopting an integrated chip.
Taking the example of charging the load by the USB charger, the charging protection circuit 100 provided in the embodiments of the present application may be disposed between the USB charger and the load or disposed on the load. When the USB charger is used to charge the load, if an emergency occurs, which is caused by an overvoltage due to factors such as a power grid interference signal, a power grid power failure, or a power grid instability, the charging protection circuit 100 can always clamp the voltage of the output terminal Vout at the first voltage, so that the load connected to the USB charger is not damaged.
For better understanding of the present application, a circuit configuration shown in fig. 2 will be described as an example.
As shown in fig. 2, in an embodiment, the resistor branch 10 includes a first resistor R1, a first end of the first resistor R1 is connected to the third end of the switch branch 20, and a second end of the first resistor R1 is connected to the first end of the switch branch 20. The first end of the first resistor R1 is the first end of the resistor branch 10, and the second end of the first resistor R1 is the second end of the resistor branch 10.
When the charge protection circuit 100 is connected to the input power V1, the output current of the input power V1 flows through the first resistor R1 to generate a voltage drop on the first resistor R1, which corresponds to the bias voltage in the above embodiment.
In one embodiment, the switching leg 20 includes a switching tube Q1, a first end of the switching tube Q1 is connected to the first end of the voltage stabilizing leg 30, a second end of the switching tube Q1 is connected to the output terminal Vout, and a third end of the switching tube Q1 is connected to the second end of the overcurrent protection leg 50. The first end of the switching tube Q1 is a first end of the switching branch 20, the second end of the switching tube Q1 is a second end of the switching branch 20, and the third end of the switching tube Q3 is a third end of the switching branch 20.
When the first resistor R1 generates a voltage drop, the switching tube Q1 is turned on, and the input power V1 charges the load 200 after sequentially passing through the input terminal Vin, the overcurrent protection branch 50, the third terminal, the second terminal and the output terminal Vout of the switching tube Q1.
In this embodiment, the switching transistor Q1 is taken as an NPN transistor. The base electrode of the NPN triode is the first end of the switching tube Q1, the emitter electrode of the NPN triode is the second end of the switching tube Q1, and the collector electrode of the NPN triode is the third end of the switching tube Q1. In other embodiments, the switching tube Q1 may be a MOS tube.
In one embodiment, the voltage stabilizing branch 30 includes a voltage stabilizing diode DW1, an anode of the voltage stabilizing diode DW1 is grounded GND, and a cathode of the voltage stabilizing diode DW1 is connected to the first end of the switch branch 20. The cathode of the zener diode DW1 is the first end of the zener branch 20, and the anode of the zener diode DW1 is the second end of the zener branch 20.
The zener diode is also known as a zener diode. The voltage stabilizing diode is a diode which is manufactured by utilizing the phenomenon that the current of the voltage stabilizing diode can be changed in a large range and the voltage is basically unchanged in a reverse breakdown state of a PN junction. A zener diode is a semiconductor device having a very high resistance up to a critical reverse breakdown voltage at which the reverse resistance is reduced to a small value, and in which the current is increased while the voltage is kept constant. The breakdown voltage of the zener diode DW1 is the voltage clamped by it.
In other words, the first preset voltage in the above embodiment is the breakdown voltage of the zener diode DW 1. When the voltage at the first end of the switching leg 20 is greater than the breakdown voltage of the zener diode DW1, the zener diode DW1 is able to clamp the voltage at the first end of the switching leg 20 to its breakdown voltage. When the overvoltage occurs, the voltage at the output terminal Vout is the difference between the breakdown voltage of the zener diode DW1 and the conduction voltage drop of the switching tube Q1 (i.e. the voltage difference between the first terminal and the second terminal of the switching tube Q1, when the switching tube Q1 is an NPN transistor, the conduction voltage drop is usually 0.7V), which corresponds to the first voltage in the above embodiment. The on-voltage drop of the switching tube Q1 is usually kept unchanged, so that by setting a suitable zener diode DW1, the first voltage can be kept smaller than the maximum voltage that can be borne by the load 200, so as to protect the load 200.
In an embodiment, the charging protection circuit 100 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3.
The first end of the first capacitor C1 is connected to the second end of the overcurrent protection branch 50, the first end of the second capacitor C2 is connected to the output end Vout, the first end of the third capacitor C3 is connected to the first end of the switch branch 20, and the second end of the first capacitor C1, the second end of the second capacitor C2 and the second end of the third capacitor C3 are all grounded GND. The first end of the first capacitor C1 is the first end of the filtering branch 40, the first end of the second capacitor C1 is the second end of the filtering branch 40, the first end of the third capacitor C1 is the third end of the filtering branch 40, and the second end of the first capacitor C1 is the fourth end of the filtering branch 40.
The first capacitor C1 is configured to filter low-frequency interference in the voltage of the input terminal Vin, the second capacitor C2 is configured to filter low-frequency interference in the voltage of the output terminal Vout, and both the first capacitor C1 and the second capacitor C2 can reduce voltage ripple to provide a stable voltage for the load 200. The third capacitor C3 is configured to filter out high-frequency interference in the voltage at the first end of the switching tube Q1, so as to prevent the high-frequency interference from acting on the load 200 through the output terminal Vout after being amplified by the switching tube Q1, i.e. prevent the load 200 from being damaged due to the excessively high voltage.
In an embodiment, the negative voltage protection branch 40 includes a first diode D1, an anode of the first diode D1 is grounded GND, and a cathode of the first diode D1 is connected to the second end of the overcurrent protection branch 50. The cathode of the first diode D1 is the first end of the negative pressure protection branch 40, and the anode of the first diode D1 is the second end of the negative pressure protection branch 40.
When the negative voltage occurs at the input terminal Vin, the anode voltage (voltage of the ground GND, typically 0V) of the first diode D1 is greater than the voltage of the cathode (negative voltage of the input terminal Vin), and the first diode D1 is turned on in the forward direction to introduce the current to the input terminal Vin.
In one embodiment, the overcurrent protection circuit 50 includes a fuse F1, a first terminal of the fuse F1 is connected to the input terminal Vin, and a second terminal of the fuse F1 is connected to the cathode of the first diode D1. The first end of the fuse F1 is the first end of the overcurrent protection branch 50, and the second end of the fuse F1 is the second end of the overcurrent protection branch 50.
When the current at the input terminal Vin is greater than the maximum current that can be borne by the fuse F1, the fuse F1 is blown, and the connection between the input terminal Vin and the third terminal of the switching tube Q1 is disconnected, thereby protecting both the charge protection circuit 100 and the load 200.
In one embodiment, the current rating of the fuse F1 is less than the current rating of the first diode D1.
The rated current of the fuse F1 is the maximum current that the fuse F1 can withstand, i.e. the maximum current that the fuse F1 is not blown. The rated current of the first diode D1 is the maximum current at which the first diode D1 is not damaged.
When overcurrent occurs, the currents on the first diode D1 and the fuse F1 increase. In this case, if the rated current of the fuse F1 is larger than the rated current of the first diode D1, the first diode D1 may be damaged because the current thereof has reached the rated current when the current on the fuse F1 has not reached the rated current yet. In other words, by setting the rated current of the fuse F1 smaller than the rated current of the first diode D1, the first diode D1 can be protected from being damaged when the fuse F1 is blown, which is advantageous for protecting the first diode D1 and the entire charge protection circuit.
In summary, in this embodiment, an overvoltage protection function is realized by the zener diode DW 1; the negative voltage protection function is realized through a first diode D1; the overcurrent protection function is realized through a fuse F1; the filtering function is realized through the first capacitor C1, the second capacitor C2 and the third capacitor C3. Thus, a charge protection function in charging the load is realized.
In addition, the charge protection circuit 100 can be realized by a simple structure, and the cost of each component is low, for example, the price of the first resistor R1, the price of the first capacitor C1 and the like are all a few minutes, and the price of the integrated chip in the related art is about 10 yuan, so the cost of the charge protection circuit provided by the embodiment of the utility model is lower than that of the integrated chip in the related art, and the charge protection circuit can be suitable for products with relatively high cost control requirements.
The embodiment of the present application further provides an electric device, where the electric device includes the charging protection circuit 100 and the load 200 in any embodiment of the present application. The electric equipment can be a shaver, a handheld fan, an electric toothbrush and the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A charge protection circuit, comprising:
the device comprises an input end, an output end, a resistor branch, a switch branch, a voltage stabilizing branch, a negative pressure protection branch and an overcurrent protection branch;
the input end is used for being connected with an input power supply, and the output end is used for being connected with a load;
a first end of the resistive branch is connected with a second end of the overcurrent protection branch, and the resistive branch is configured to generate a bias voltage based on the voltage of the input power supply;
a third end of the switching leg is connected to the first end of the resistive leg, a second end of the switching leg is connected to the output end, the first end of the switching leg is connected to the second end of the resistive leg, the switching leg is configured to turn on the third end and the second end of the switching leg in response to the bias voltage to establish a connection between the input end and the output end;
a voltage stabilizing branch, wherein a first end of the voltage stabilizing branch is connected with a first end of the switching branch, and the voltage stabilizing branch is configured to clamp the voltage of the first end of the switching branch at a first preset voltage when the voltage of the first end of the switching branch is greater than the first preset voltage so as to clamp the voltage of the output end to be the first voltage, and the first voltage is the difference between the first preset voltage and the conduction voltage drop of the switching branch;
the first end of the negative pressure protection branch is connected with the second end of the overcurrent protection branch, the second end of the negative pressure protection branch is grounded, and the negative pressure protection branch is configured to guide current into the input end from the second end of the negative pressure protection branch when the voltage of the input end is negative pressure;
the first end of the overcurrent protection branch is connected with the input end, the second end of the overcurrent protection branch is also connected with the third end of the switch branch, and the overcurrent protection branch is configured to disconnect the connection between the input end and the third end of the switch branch when the current of the input end is greater than a first preset current.
2. The charge protection circuit of claim 1, wherein the resistor branch comprises a first resistor having a first end connected to the third end of the switch branch and a second end connected to the first end of the switch branch.
3. The charge protection circuit of claim 1, wherein the switching leg comprises a switching tube, a first end of the switching tube is connected to the first end of the voltage stabilizing leg, a second end of the switching tube is connected to the output end, and a third end of the switching tube is connected to the second end of the overcurrent protection leg.
4. The charge protection circuit of claim 1, wherein the voltage regulator branch comprises a voltage regulator diode having an anode coupled to ground and a cathode coupled to the first end of the switch branch.
5. The charge protection circuit of claim 2, further comprising a first capacitor, a second capacitor, and a third capacitor;
the first end of the first capacitor is connected with the second end of the overcurrent protection branch, the first end of the second capacitor is connected with the output end, the first end of the third capacitor is connected with the first end of the switch branch, and the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are grounded.
6. The charge protection circuit of claim 1, wherein the negative voltage protection branch comprises a first diode, an anode of the first diode is grounded, and a cathode of the first diode is connected to a second end of the overcurrent protection branch.
7. The charge protection circuit of claim 6, wherein the over-current protection branch comprises a fuse having a first end connected to the input terminal and a second end connected to a cathode of the first diode.
8. The charge protection circuit of claim 7, wherein the current rating of the fuse is less than the current rating of the first diode.
9. A powered device comprising a charging protection circuit as claimed in any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222571779.5U CN219394443U (en) | 2022-09-27 | 2022-09-27 | Charging protection circuit and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222571779.5U CN219394443U (en) | 2022-09-27 | 2022-09-27 | Charging protection circuit and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219394443U true CN219394443U (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222571779.5U Active CN219394443U (en) | 2022-09-27 | 2022-09-27 | Charging protection circuit and electric equipment |
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| Country | Link |
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| CN (1) | CN219394443U (en) |
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2022
- 2022-09-27 CN CN202222571779.5U patent/CN219394443U/en active Active
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