Reverse power supply prevention circuit used in mobile power supply

Abstract

The utility model provides an anti-reverse power supply circuit used in a mobile power supply, which comprises a noise reduction filtering safety circuit, an anti-reverse connection switch circuit, a power supply current detection circuit and a power supply voltage detection circuit, and is characterized in that the input end of the noise reduction filtering safety circuit is connected with an internal power supply of the mobile power supply; the output end of the noise reduction filtering safety circuit is connected with the input end of the anti-reverse connection switch circuit, and the output end of the anti-reverse connection switch circuit is connected with the input end of the power supply current detection circuit, the input end of the power supply voltage detection circuit and an external power supply interface of the mobile power supply. The input end of the anti-reverse connection switch circuit is also connected with the central processor of the mobile power supply. The output end of the power supply current detection circuit and the output end of the power supply voltage detection circuit are connected with the central processor of the mobile power supply. The beneficial effects of the utility model are that the mobile power supply has a reverse power supply prevention function, and also has over-current detection and over-voltage detection functions.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to an anti-reverse power supply circuit used in a mobile power source. Background Art

[0002] Mobile Power Pack (MPP), also known as power bank, travel charger, etc., is a portable charger that integrates power supply and charging functions. It can charge mobile phones, tablets and other digital devices anytime and anywhere. It usually uses lithium batteries (or dry batteries, which are less common) as power storage units and is easy and quick to use.

[0003] In the application scenarios of mobile power supplies, many power supply interfaces of mobile power supplies adopt non-protocol power supply methods. Such power supply interfaces of non-protocol power supply methods generally do not have the function of preventing reverse power supply. For mobile power supplies without the function of preventing reverse power supply, if the power supply interface that originally supplies power to the outside is connected to the reverse power supply from the outside, it may cause the internal circuit of the mobile power supply to burn and be damaged at the least, or even cause the mobile power supply to catch fire and cause safety hazards. Utility Model Content

[0004] In order to solve the problems in the prior art, the utility model provides an anti-reverse power supply circuit for a mobile power supply. By arranging a noise reduction filter insurance circuit, an anti-reverse connection switch circuit, a power supply current detection circuit and a power supply voltage detection circuit that cooperate with each other in the anti-reverse power supply circuit for the mobile power supply, the mobile power supply can have the function of anti-reverse power supply, and also has the functions of overcurrent detection and overvoltage detection, which greatly improves the safety and stability of the mobile power supply, better meets people's usage needs, and solves the problem in the prior art that many mobile power supplies do not have the anti-reverse power supply function, which may lead to easy burning or even cause safety hazards.

[0005] The utility model provides an anti-reverse power supply circuit for a mobile power supply, which is arranged between a central processor of the mobile power supply and an external power supply interface of the mobile power supply, and comprises a noise reduction filter insurance circuit, an anti-reverse connection switch circuit, a power supply current detection circuit and a power supply voltage detection circuit. The input end of the noise reduction filter insurance circuit is connected to the internal power supply of the mobile power supply, the output end of the noise reduction filter insurance circuit is connected to the input end of the anti-reverse connection switch circuit, the output end of the anti-reverse connection switch circuit is connected to the input end of the power supply current detection circuit, the input end of the power supply voltage detection circuit and the external power supply interface of the mobile power supply, the input end of the anti-reverse connection switch circuit is also connected to the central processor of the mobile power supply, the output end of the power supply current detection circuit and the output end of the power supply voltage detection circuit are connected to the central processor of the mobile power supply, the central processor of the mobile power supply can control the power supply on and off of the external power supply interface of the mobile power supply through the anti-reverse connection switch circuit according to the information fed back by the power supply current detection circuit and the power supply voltage detection circuit, and the anti-reverse connection switch circuit can prevent the external power supply interface of the mobile power supply from being reversely powered.

[0006] The utility model is further improved, the noise reduction filter insurance circuit is provided with a fuse F1, a filter capacitor C1 and a filter capacitor EC1, wherein one end of the fuse F1 is connected to the internal power supply of the mobile power supply, the other end of the fuse F1 is connected to one end of the filter capacitor C1, one end of the filter capacitor EC1, and the input end of the anti-reverse connection switch circuit, and the other end of the filter capacitor C1 and the other end of the filter capacitor EC1 are grounded.

[0007] The utility model is further improved, the anti-reverse connection switch circuit is provided with a field effect tube M1, a field effect tube M2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an inductor L1, wherein the drain of the field effect tube M1 is connected to one end of the resistor R1, the other end of the fuse F1, one end of the filter capacitor C1, and one end of the filter capacitor EC1, the source of the field effect tube M1 is connected to the external power supply interface of the mobile power supply through the inductor L1, the gate of the field effect tube M2 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 is connected to the central processor of the mobile power supply, the drain of the field effect tube M2 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the other end of the resistor R1, the gate of the field effect tube M1, the input end of the power supply current detection circuit, and the input end of the power supply voltage detection circuit, and the other end of the resistor R3 and the source of the field effect tube M2 are grounded.

[0008] The utility model is further improved, the power supply current detection circuit is provided with a resistor RS1, a resistor R5 and a capacitor C2, wherein one end of the resistor RS1 is connected to the other end of the resistor R4, the other end of the resistor R1, and the gate of the field effect transistor M1, the other end of the resistor RS1 is connected to one end of the resistor R5, one end of the capacitor C2, and the input end of the inductor L1, the other end of the resistor R5 is connected to the central processor of the mobile power supply, the other end of the capacitor C2 is also connected to the input end of the inductor L1, and the output end of the inductor L1 is connected to the external power supply interface of the mobile power supply.

[0009] The utility model is further improved, the power supply voltage detection circuit is provided with a resistor R6, a resistor R7, a resistor R8 and a capacitor C4, wherein one end of the resistor R6 is connected to one end of the capacitor C4 and a central processor of the mobile power supply, the other end of the resistor R6 is connected to one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R8 is connected to the external power supply interface of the mobile power supply, and the other end of the resistor R7 and the other end of the capacitor C4 are grounded.

[0010] The utility model is further improved in that the resistance value of the resistor R1 is 10KΩ, and the resistance value of the resistor R4 is 100Ω.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: providing an anti-reverse power supply circuit for a mobile power supply, by arranging a noise reduction filter insurance circuit, an anti-reverse connection switch circuit, a power supply current detection circuit and a power supply voltage detection circuit that cooperate with each other in the anti-reverse power supply circuit for the mobile power supply, the central processor of the mobile power supply can control the power supply on and off of the external power supply interface of the mobile power supply through the anti-reverse connection switch circuit according to the information fed back by the power supply current detection circuit and the power supply voltage detection circuit, and at the same time, the anti-reverse connection switch circuit can prevent the external power supply interface of the mobile power supply from being reversely powered, so that the mobile power supply can have the function of anti-reverse power supply, and at the same time, it also has the functions of overcurrent detection and overvoltage detection, which greatly improves the safety and stability of the mobile power supply, better meets people's use needs, and solves the problem in the prior art that many mobile power supplies do not have the anti-reverse power supply function, which may lead to easy burning or even safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 The utility model is a circuit diagram of a reverse power supply prevention circuit used in a mobile power supply. DETAILED DESCRIPTION

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present utility model; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0015] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0016] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0017] like Figure 1As shown, the utility model provides an anti-reverse power supply circuit for a mobile power supply, which is arranged between the central processor of the mobile power supply and the external power supply interface of the mobile power supply, and includes a noise reduction filter insurance circuit, an anti-reverse connection switch circuit, a power supply current detection circuit and a power supply voltage detection circuit. The input end of the noise reduction filter insurance circuit is connected to the internal power supply of the mobile power supply, the output end of the noise reduction filter insurance circuit is connected to the input end of the anti-reverse connection switch circuit, the output end of the anti-reverse connection switch circuit is connected to the input end of the power supply current detection circuit, the input end of the power supply voltage detection circuit, and the external power supply interface of the mobile power supply, the input end of the anti-reverse connection switch circuit is also connected to the central processor of the mobile power supply, and the output end of the power supply current detection circuit and the output end of the power supply voltage detection circuit are connected to the central processor of the mobile power supply. In this embodiment, the central processor of the mobile power supply can control the power supply on and off of the external power supply interface of the mobile power supply through the anti-reverse switching circuit according to the information fed back by the power supply current detection circuit and the power supply voltage detection circuit. At the same time, the anti-reverse switching circuit can prevent the external power supply interface of the mobile power supply from being reversely powered, so that the mobile power supply can have the function of preventing reverse power supply. At the same time, it also has the functions of overcurrent detection and overvoltage detection, which greatly improves the safety and stability of the mobile power supply and better meets people's usage needs.

[0018] like Figure 1 As shown, the noise reduction filter insurance circuit is provided with a fuse F1, a filter capacitor C1 and a filter capacitor EC1, wherein one end of the fuse F1 is connected to the internal power supply of the mobile power supply, and the other end of the fuse F1 is connected to one end of the filter capacitor C1, one end of the filter capacitor EC1, and the input end of the anti-reverse connection switch circuit, and the other end of the filter capacitor C1 and the other end of the filter capacitor EC1 are grounded. In this embodiment, the noise reduction filter insurance circuit is used for power supply insurance and noise reduction filtering, wherein the fuse F1 is a total power supply insurance to ensure that the power supply is disconnected in time when abnormal power supply or external load short circuit occurs, to avoid power supply accidents; the filter capacitor C1 and the filter capacitor EC1 are power supply filter capacitors to reduce the power supply ripple current and ensure the stability of the power supply voltage.

[0019] like Figure 1As shown, the anti-reverse connection switch circuit is provided with a field effect tube M1, a field effect tube M2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an inductor L1, wherein the drain of the field effect tube M1 is connected to one end of the resistor R1, the other end of the fuse F1, one end of the filter capacitor C1, and one end of the filter capacitor EC1, the source of the field effect tube M1 is connected to the external power supply interface of the mobile power supply through the inductor L1, the gate of the field effect tube M2 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 is connected to the central processor of the mobile power supply, the drain of the field effect tube M2 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the other end of the resistor R1, the gate of the field effect tube M1, the input end of the power supply current detection circuit, and the input end of the power supply voltage detection circuit, the other end of the resistor R3 and the source of the field effect tube M2 are grounded; the resistance value of the resistor R1 is 10KΩ, and the resistance value of the resistor R4 is 100Ω. In this embodiment, the anti-reverse connection switch circuit is used to control the power supply on and off of the external power supply interface of the mobile power supply, and the anti-reverse connection switch circuit can prevent the external power supply interface of the mobile power supply from being reversely powered; when the POUT_ON signal is at a low level, the field effect transistor M2 is disconnected, and the gate of the field effect transistor M1 is at a high level, which can ensure that the field effect transistor M1 is turned off, and the external power supply interface of the mobile power supply is cut off from supplying power to the outside. At the same time, the internal diode of the field effect transistor M1 will play a role in preventing reverse power supply. When the POUT_ON signal is at a high level, the field effect transistor M2 is turned on, the gate of the field effect transistor M1 is at a low level, the field effect transistor M1 will be turned on, and the external power supply interface of the mobile power supply can be powered normally.

[0020] like Figure 1 As shown, the power supply current detection circuit is provided with a resistor RS1, a resistor R5 and a capacitor C2, wherein one end of the resistor RS1 is connected to the other end of the resistor R4, the other end of the resistor R1 and the gate of the field effect transistor M1, the other end of the resistor RS1 is connected to one end of the resistor R5, one end of the capacitor C2 and the input end of the inductor L1, the other end of the resistor R5 is connected to the central processor of the mobile power supply, the other end of the capacitor C2 is also connected to the input end of the inductor L1, and the output end of the inductor L1 is connected to the external power supply interface of the mobile power supply. In this embodiment, the power supply current detection circuit is used to detect the magnitude of the external power supply current of the mobile power supply in real time and feed it back to the central processor of the mobile power supply; when it is detected that the power supply current is greater than the rated power supply current, the central processor of the mobile power supply can cut off the external power supply interface of the mobile power supply by controlling the POUT_ON signal to a low level.

[0021] like Figure 1As shown, the power supply voltage detection circuit is provided with a resistor R6, a resistor R7, a resistor R8 and a capacitor C4, wherein one end of the resistor R6 is connected to one end of the capacitor C4 and the central processor of the mobile power supply, the other end of the resistor R6 is connected to one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R8 is connected to the external power supply interface of the mobile power supply, and the other end of the resistor R7 and the other end of the capacitor C4 are grounded. In this embodiment, the power supply voltage detection circuit is used to detect the magnitude of the external power supply voltage of the mobile power supply in real time and feed it back to the central processor of the mobile power supply; when it is detected that the power supply voltage is greater than the rated power supply voltage, the central processor of the mobile power supply can control the POUT_ON signal to be low level to cut off the external power supply interface of the mobile power supply from supplying power to the outside.

[0022] As can be seen from the above, the utility model provides an anti-reverse power supply circuit for a mobile power supply. By arranging a noise reduction filter insurance circuit, an anti-reverse connection switch circuit, a power supply current detection circuit and a power supply voltage detection circuit that cooperate with each other in the anti-reverse power supply circuit for the mobile power supply, the central processor of the mobile power supply can control the power supply on and off of the external power supply interface of the mobile power supply through the anti-reverse connection switch circuit according to the information fed back by the power supply current detection circuit and the power supply voltage detection circuit. At the same time, the anti-reverse connection switch circuit can prevent the external power supply interface of the mobile power supply from being reversely powered, and can enable the mobile power supply to have the function of anti-reverse power supply. At the same time, it also has the functions of overcurrent detection and overvoltage detection, which greatly improves the safety and stability of the mobile power supply, better meets people's use needs, and solves the problem in the prior art that many mobile power supplies do not have the anti-reverse power supply function, which may lead to easy burning or even safety hazards.

[0023] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A reverse power supply protection circuit for a mobile power source, arranged between a central processor of the mobile power source and an external power supply interface of the mobile power source, characterized in that: The invention comprises a noise reduction filter insurance circuit, an anti-reverse connection switch circuit, a power supply current detection circuit and a power supply voltage detection circuit. The input end of the noise reduction filter insurance circuit is connected to the internal power supply of the mobile power supply, the output end of the noise reduction filter insurance circuit is connected to the input end of the anti-reverse connection switch circuit, the output end of the anti-reverse connection switch circuit is connected to the input end of the power supply current detection circuit, the input end of the power supply voltage detection circuit and the external power supply interface of the mobile power supply, the input end of the anti-reverse connection switch circuit is also connected to the central processor of the mobile power supply, the output end of the power supply current detection circuit and the output end of the power supply voltage detection circuit are connected to the central processor of the mobile power supply, the central processor of the mobile power supply can control the power supply on and off of the external power supply interface of the mobile power supply through the anti-reverse connection switch circuit according to the information fed back by the power supply current detection circuit and the power supply voltage detection circuit, and at the same time, the anti-reverse connection switch circuit can prevent the external power supply interface of the mobile power supply from being reversely powered.

2. The anti-reverse power supply circuit for a mobile power source according to claim 1, characterized in that: The noise reduction filter insurance circuit is provided with a fuse F1, a filter capacitor C1 and a filter capacitor EC1, wherein one end of the fuse F1 is connected to the internal power supply of the mobile power supply, the other end of the fuse F1 is connected to one end of the filter capacitor C1, one end of the filter capacitor EC1, and the input end of the anti-reverse connection switch circuit, and the other end of the filter capacitor C1 and the other end of the filter capacitor EC1 are grounded.

3. The anti-reverse power supply circuit for a mobile power source according to claim 2, characterized in that: The anti-reverse connection switch circuit is provided with a field effect tube M1, a field effect tube M2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an inductor L1, wherein the drain of the field effect tube M1 is connected to one end of the resistor R1, the other end of the fuse F1, one end of the filter capacitor C1, and one end of the filter capacitor EC1, the source of the field effect tube M1 is connected to the external power supply interface of the mobile power supply through the inductor L1, the gate of the field effect tube M2 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 is connected to the central processor of the mobile power supply, the drain of the field effect tube M2 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the other end of the resistor R1, the gate of the field effect tube M1, the input end of the power supply current detection circuit, and the input end of the power supply voltage detection circuit, and the other end of the resistor R3 and the source of the field effect tube M2 are grounded.

4. The anti-reverse power supply circuit for a mobile power source according to claim 3, characterized in that: The power supply current detection circuit is provided with a resistor RS1, a resistor R5 and a capacitor C2, wherein one end of the resistor RS1 is connected to the other end of the resistor R4, the other end of the resistor R1, and the gate of the field effect transistor M1, the other end of the resistor RS1 is connected to one end of the resistor R5, one end of the capacitor C2, and the input end of the inductor L1, the other end of the resistor R5 is connected to the central processor of the mobile power supply, the other end of the capacitor C2 is also connected to the input end of the inductor L1, and the output end of the inductor L1 is connected to the external power supply interface of the mobile power supply.

5. The reverse power supply protection circuit for a mobile power source according to claim 4, characterized in that: The power supply voltage detection circuit is provided with a resistor R6, a resistor R7, a resistor R8 and a capacitor C4, wherein one end of the resistor R6 is connected to one end of the capacitor C4 and a central processor of the mobile power supply, the other end of the resistor R6 is connected to one end of the resistor R7 and one end of the resistor R8, the other end of the resistor R8 is connected to the external power supply interface of the mobile power supply, and the other end of the resistor R7 and the other end of the capacitor C4 are grounded.

6. The reverse power supply protection circuit for a mobile power source according to claim 5, characterized in that: The resistance value of the resistor R1 is 10KΩ, and the resistance value of the resistor R4 is 100Ω.

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