Charging interface switch control circuit and charger

Abstract

The utility model relates to the field of charging control, in particular to a charging interface switch control circuit and a charger, comprising a Hall module used for sensing the change of a surrounding magnetic field and converting the change into an electric signal; the control module is used for receiving the electric signal converted by the Hall module and converting the electric signal into required voltage through an operational amplifier; the transistor is arranged at the rear end of the control module; and the output filtering module is used for controlling the opening and closing of the transistor through the voltage converted by the operational amplifier so as to control the output of the whole circuit. The circuit protection circuit is applied between an adapter and a charging interface, is simple in structure and low in cost, and can efficiently play a circuit protection role when a circuit is short-circuited.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of charging control, specifically, relates to a charging interface switch control circuit and charger. BACKGROUND

[0002] With the popularity of portable electronic devices (such as smart phones, tablet computers, notebook computers, etc.), the demand for charging also increases. In the prior art, the charging interface, as an important part of the electronic device, is mainly responsible for the input of electric energy. The traditional charging interface control method is relatively simple, and usually does not integrate complex circuit design to automatically control the opening and closing of the charging interface, which leads to short circuit phenomenon in humid environment or improper operation (especially in the room of the hospital), thereby affecting the normal use of the device, and even causing safety hazards.

[0003] In the prior art, although some products have adopted chip control method to improve the safety of the charging interface, the cost of this solution is still high, and some products do not have the necessary short circuit protection function, so the user's use safety still faces certain risks. In addition, although some advanced protection measures such as short circuit protection and overcurrent protection can improve safety, the high cost makes it difficult for ordinary consumers to accept, increasing the use threshold. Therefore, there is an urgent need for an economical and efficient charging interface solution in the market to meet the needs of the general public for convenient and safe charging. SUMMARY

[0004] The utility model aims at providing a kind of charging interface switch control circuit, it is applied to between adapter and charging interface, its simple structure, low cost, and can efficiently play the role of circuit protection when circuit short circuit.

[0005] Another purpose of the utility model is to provide a kind of charger, its simple structure, low cost, and can efficiently play the role of circuit protection when circuit short circuit.

[0006] The technical scheme of the utility model is realized as follows:

[0007] A kind of charging interface switch control circuit, it is applied to between adapter and charging interface, it includes:

[0008] Hall module, for sensing the change of surrounding magnetic field, and it is converted into electrical signal;

[0009] Control module, for receiving the electrical signal converted by the Hall module, and it is converted into required voltage by operational amplifier;

[0010] Transistor, set to the rear end of the control module;

[0011] An output filter module is configured to control opening and closing of the transistor by the voltage converted by the operational amplifier, so as to control the output of the whole circuit.

[0012] Further, the Hall module comprises a Hall sensor, and a magnetic material with a magnetic field is arranged in the interior of the device to be charged, and the Hall sensor is arranged correspondingly to the magnetic material.

[0013] Further, the magnetic material is a magnet, which is inlaid in the interior of the device to be charged.

[0014] Further, the transistor is a MOS tube or a triode.

[0015] Further, the transistor is a MOS tube, and the Hall sensor can control the gate voltage of the MOS tube to control opening or closing of the MOS tube.

[0016] Further, the MOS tube is an N-channel enhancement mode MOS tube.

[0017] When the output voltage of the operational amplifier is greater than the threshold voltage of the N-channel enhancement mode MOS tube, the N-channel enhancement mode MOS tube is opened.

[0018] When the output voltage of the operational amplifier is less than the threshold voltage of the N-channel enhancement mode MOS tube, the N-channel enhancement mode MOS tube is closed.

[0019] Further, the output filter module comprises two parallel capacitors and a bidirectional TVS for output filtering and ESD protection.

[0020] A charging interface switch control circuit is applied between an adapter and a charging interface, which comprises:

[0021] A pressure-sensitive module comprises a pressure-sensitive device, which is configured to sense voltage change in the surrounding circuit and change the output voltage of the circuit.

[0022] A control module comprises an operational amplifier, which is configured to amplify the output voltage changed by the pressure-sensitive device.

[0023] A transistor is arranged at the rear end of the control module.

[0024] An output filter module is configured to control opening and closing of the transistor by the voltage amplified by the operational amplifier, so as to control the output of the whole circuit.

[0025] Further, the transistor adopts a MOS tube, when the voltage amplified by the operational amplifier is greater than the threshold voltage of the MOS tube, the MOS tube opens; when the voltage amplified by the operational amplifier is less than the threshold voltage of the MOS tube, the MOS tube closes.

[0026] A charger comprises an adapter and a charging interface arranged at an output end of the adapter, and further comprises a charging interface switch control circuit arranged between the adapter and the charging interface.

[0027] Compared with the prior art, the utility model has the beneficial effects that:

[0028] The charging interface switch control circuit is applied between the adapter and the charging interface, and a magnetic material such as a magnet is arranged internally in the charged device. When the charging interface is electrically connected with the charged device to charge, at this time, the Hall module is close to the charged device and can sense the magnetic field of the magnetic material and output an electric signal, and the electric signal is converted into the gate voltage required for opening the transistor by the operational amplifier, so that the transistor is opened, and automatic charging is completed; when the circuit is short-circuited, the voltage in the circuit approaches zero, so that the voltage converted by the operational amplifier is less than the threshold voltage of the transistor, the transistor is closed, and power-off is completed, and the switch control circuit can efficiently play a circuit protection role when the circuit is short-circuited. The overall structure of the switch control circuit is simple, the price is low, and the function of the protection circuit is realized at a very low cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 It is the circuit structure schematic diagram of the charging interface switch control circuit of the embodiment 1 of the utility model.

[0031] In the drawing:

[0032] 1-Hall module;

[0033] 2-control module; 201-operational amplifier;

[0034] 3-transistor;

[0035] 4-output filter module. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0038] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0040] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0041] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Some embodiments of the present application will be described in detail with reference to the drawings. In the case of no conflict, the following examples and features in the examples can be combined with each other.

[0043] Embodiment 1

[0044] Reference Figure 1 The present embodiment provides a charging interface switch control circuit, which is applied between an adapter and a charging interface, and includes:

[0045] A Hall module 1 for sensing the change of the surrounding magnetic field and converting it into an electrical signal;

[0046] A control module 2 for receiving the electrical signal converted by the Hall module 1 and converting it into a required voltage through an operational amplifier 201;

[0047] A transistor 3 arranged at the back end of the control module 2;

[0048] An output filter module 4 for controlling the opening and closing of the transistor 3 through the voltage converted by the operational amplifier 201, so as to control the output of the entire circuit.

[0049] Specifically, the Hall module includes a Hall sensor, and a magnetic material with a magnetic field, such as a magnet, is arranged in the interior of a charged device (such as a smart phone, a tablet computer, a notebook computer, etc.), and the magnet is inlaid in the interior of the charged device; the Hall sensor is arranged correspondingly to the magnet, and when the charged device is charged, the Hall sensor can be close to the magnet and be in the magnetic field of the magnet, and through sensing the change of the magnetic field, the Hall sensor converts the physical signal into an electrical signal.

[0050] In the present embodiment, the transistor 3 is a MOS tube (metal oxide semiconductor field effect transistor 3) or a triode (bipolar transistor 3).

[0051] Both the MOS tube and the triode are commonly used electronic switching devices, and they play a role in controlling the flow of current in the circuit. The differences between the two devices will be described in detail as follows:

[0052] Characteristics of the MOS tube:

[0053] 1. High input impedance: The gate of the MOS tube hardly consumes current, so its input impedance is very high.

[0054] 2. Fast switching speed: Due to the high input impedance, the switching speed of the MOS tube is very fast.

[0055] 3. Simple driving circuit: Because of the high input impedance, the driving circuit of the MOS tube is relatively simple.

[0056] 4. Low power loss: When working in the saturation region, the MOS tube has a low on-resistance, so the power loss is small.

[0057] 5. Strong voltage resistance: MOS tubes have strong voltage resistance and are suitable for high-voltage applications.

[0058] Characteristics of triodes:

[0059] 1. Low input impedance: The base of a triode requires a certain base current to drive.

[0060] 2. Slow switching speed: The switching speed of a triode is relatively slow, especially in high-power applications.

[0061] 3. Complex driving circuit: Triodes require a large base current to drive, so the driving circuit is relatively complex.

[0062] 4. High power loss: When working in the saturation region, the on-resistance of a triode is large, so the power loss is high.

[0063] 5. Average voltage resistance: The voltage resistance of a triode is relatively low, suitable for low-voltage applications.

[0064] In summary, MOS tubes and triodes can be applied in digital circuits, so they are suitable for the switch control circuit.

[0065] In this embodiment, transistor 3 is preferably a MOS tube, and the Hall sensor can control the gate voltage of the MOS tube to control the opening or closing of the MOS tube.

[0066] N-channel enhancement mode MOS (NMOS) on condition:

[0067] When the gate voltage is greater than the threshold voltage, the NMOS tube is turned on.

[0068] NMOS off condition:

[0069] When the gate voltage is less than or equal to the threshold voltage, the NMOS tube is turned off.

[0070] In this embodiment, the output filter module 4 includes two parallel capacitors and a bidirectional TVS for output filtering and ESD protection, and the output filtering and ESD circuit is composed of two parallel capacitors and a bidirectional TVS.

[0071] Wherein, the ESD (Electrostatic Discharge) protection circuit refers to the circuit designed to prevent static discharge from damaging electronic devices. Static discharge is a common phenomenon, especially in dry environments, where the human body accumulates static charge and releases it when touching electronic devices. This instantaneous high-voltage discharge can damage sensitive electronic components.

[0072] Main functions of ESD protection circuit:

[0073] 1. Protect sensitive components:

[0074] Protect sensitive electronic components in the circuit from static discharge damage.

[0075] 2. Fast response:

[0076] Capable of responding to static discharge events within nanoseconds, quickly directing discharge current to ground or other safe paths.

[0077] 3. Low on-voltage:

[0078] ESD protection circuit can quickly turn on and clamp voltage at a low safe level during static discharge.

[0079] 4. High reliability:

[0080] Can withstand multiple static discharge events without failure.

[0081] The working principle of the application is: between the adapter and the charging interface, a MOS tube is added as a switch. The gate voltage of the MOS tube is controlled by the Hall sensor to turn on and off, thereby realizing the opening and closing of the adapter charging. Among them, the control module 2: a simple control circuit is built through the operational amplifier 201, which can output the voltage you want according to the specifications and models of the MOS tube you choose. Output filter module 4: according to your needs, an output filter and ESD protection circuit are composed of two parallel capacitors and a bidirectional TVS. When the charged device is charging, the Hall sensor senses the magnetic field and outputs an electrical signal. The electrical signal is converted into the gate voltage required to turn on the MOS tube by the operational amplifier 201, so that the MOS tube is turned on, and automatic charging is completed.

[0082] When the circuit is short-circuited, the voltage in the circuit approaches zero, making the voltage converted by the operational amplifier 201 less than the threshold voltage of the transistor 3, so that the transistor 3 is turned off, completing the power-off, and the switch control circuit can efficiently protect the circuit when the circuit is short-circuited. The overall structure of the switch control circuit is simple and low in price, and the function of the protection circuit is realized at a very low cost.

[0083] Example 2

[0084] The embodiment provides a charging interface switch control circuit, which is applied between an adapter and a charging interface and comprises the following components.

[0085] A pressure-sensitive module comprises a pressure-sensitive device, which is used for sensing voltage variation in a surrounding circuit and changing output voltage of the circuit;

[0086] A control module 2 comprises an operational amplifier 201, which is used for amplifying the output voltage changed by the pressure-sensitive device;

[0087] A transistor 3 is arranged at the rear end of the control module 2;

[0088] An output filter module 4 is used for controlling opening and closing of the transistor 3 through the voltage amplified by the operational amplifier 201, so as to control output of the whole circuit.

[0089] The embodiment is different from the embodiment 1 in that a pressure-sensitive device is used instead of a Hall sensor.

[0090] Specifically, when voltage in a circuit exceeds breakdown voltage of a pressure-sensitive resistor (also known as a varistor or VDR), the pressure-sensitive resistor rapidly enters a low-resistance state and allows current to pass. When voltage in the circuit is lower than the breakdown voltage of the pressure-sensitive resistor, the pressure-sensitive resistor presents a high-resistance state.

[0091] The transistor 3 adopts an NMOS tube, when a charged device is normally charged, the voltage amplified by the operational amplifier 201 is greater than threshold voltage of the NMOS tube, and the NMOS tube is opened; when the circuit is short-circuited, voltage accepted by the operational amplifier 201 becomes smaller, and the voltage amplified by the operational amplifier 201 is smaller than the threshold voltage of the MOS tube, and the MOS tube is closed. Therefore, the voltage converted by the operational amplifier 201 controls opening and closing of the NMOS tube or a triode, so as to realize automatic switch control of the charging interface.

[0092] Embodiment 3

[0093] A charger comprises an adapter and a charging interface arranged at an output end of the adapter, and further comprises the charging interface switch control circuit arranged between the adapter and the charging interface. A power supply charges a charged device through the charger, and realizes switch control of the whole circuit through the charging interface switch control circuit.

[0094] The technical scheme of the utility model has the beneficial effects that:

[0095] The scheme is easy to manufacture, integrate and serially produce, low in cost and convenient to use by means of simple pure digital circuit to complete automatic switch control. The scheme converts physical signal into electric signal by Hall sensor (Hall device) induction magnet, converts required voltage by operational amplifier 201 to control MOS tube conduction state, and then realizes circuit switch control. Meanwhile, magnet and Hall device position correspond to open charge interface to avoid reverse charging problem.

[0096] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0097] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can be variously modified and changed. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging interface switch control circuit, characterized in that, Applied between the adapter and the charging interface, it includes: Hall module (1) is used to sense changes in the surrounding magnetic field and convert them into electrical signals; The control module (2) is used to receive the electrical signal converted by the Hall module (1) and convert it into the required voltage through the operational amplifier (201); Transistor (3) is disposed at the rear end of the control module (2); The output filtering module (4) is used to control the opening and closing of the transistor (3) by the voltage converted by the operational amplifier (201), thereby controlling the output of the entire circuit.

2. The charging interface switch control circuit according to claim 1, characterized in that, The Hall module (1) includes a Hall sensor, and a magnetic material with a magnetic field is disposed inside the device being charged. The Hall sensor is disposed in correspondence with the magnetic material.

3. The charging interface switch control circuit according to claim 2, characterized in that, The magnetic material is a magnet, which is embedded inside the device being charged.

4. The charging interface switch control circuit according to claim 3, characterized in that, The transistor (3) is a MOS transistor or a triode.

5. The charging interface switch control circuit according to claim 4, characterized in that, The transistor (3) is a MOS transistor, and the Hall sensor can control the gate voltage of the MOS transistor to control the MOS transistor to turn on or off.

6. The charging interface switch control circuit according to claim 5, characterized in that, The MOSFET is an N-channel enhancement-mode MOSFET; When the output voltage of the operational amplifier (201) is greater than the threshold voltage of the N-channel enhancement-mode MOSFET, the N-channel enhancement-mode MOSFET is turned on; When the output voltage of the operational amplifier (201) is less than the threshold voltage of the N-channel enhancement-mode MOSFET, the N-channel enhancement-mode MOSFET is turned off.

7. The charging interface switch control circuit according to claim 1, characterized in that, The output filtering module (4) includes two parallel capacitors and a bidirectional TVS for output filtering and ESD protection.

8. A charging interface switch control circuit, characterized in that, Applied between the adapter and the charging interface, it includes: A pressure-sensitive module includes a pressure-sensitive device, which is used to sense voltage changes in the surrounding circuit and change the output voltage of the circuit. The control module (2) includes an operational amplifier (201), which is used to amplify the output voltage of the pressure-sensitive device after the change. Transistor (3) is disposed at the rear end of the control module (2); The output filtering module (4) is used to control the opening and closing of the transistor (3) by the voltage amplified by the operational amplifier (201), thereby controlling the output of the entire circuit.

9. The charging interface switch control circuit according to claim 8, characterized in that, The transistor (3) is a MOS transistor. When the voltage amplified by the operational amplifier (201) is greater than the threshold voltage of the MOS transistor, the MOS transistor is turned on; when the voltage amplified by the operational amplifier (201) is less than the threshold voltage of the MOS transistor, the MOS transistor is turned off.

10. A charger, comprising an adapter and a charging interface disposed at the output end of the adapter, characterized in that, It also includes a charging interface switch control circuit as described in any one of claims 1-9, wherein the charging interface switch control circuit is disposed between the adapter and the charging interface.

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