Charger controlled by Hall switch

Abstract

The utility model discloses a charger controlled by a Hall switch. The charger comprises a charging circuit and a charger shell 1, the charging circuit comprises a power supply input end, a Hall sensor connected with the power supply input end, a PMOS transistor connected with the Hall sensor in parallel, a charging management chip connected with the PMOS transistor, and an NPN triode connected with the PMOS transistor and the Hall sensor. Wherein the base electrode of the NPN triode is connected with the output end of the Hall sensor, and the emitter electrode of the NPN triode is grounded; a first divider resistor is connected between the base electrode of the NPN triode and the output end of the Hall sensor, and the first divider resistor is grounded; the source electrode of the PMOS transistor is connected with the power input end, the drain electrode is connected with the charging management chip, and the grid electrode is connected with the collector electrode of the NPN triode. The beneficial effects of the utility model are that: 1, the charging management chip of the charger is controlled by the Hall switch, so that standby energy consumption is reduced; 2, the control is stable; and 3, the structure is simple and the production cost is low.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and more specifically to a charger controlled by a Hall switch. Background Technology

[0002] Currently, charging technology for electronic devices such as mobile phones is developing rapidly. In traditional wireless chargers, as long as the wireless charging power management chip has a suitable power supply voltage, it will start working. The circuit diagram is as follows: Figure 4 As shown, all control measures are handled by the charging management chip, which places high demands on the performance of the charging management chip and wastes power by keeping the charging management chip constantly powered on.

[0003] Therefore, there is an urgent need to develop a Hall-switch-controlled charger that can reduce standby power consumption. Utility Model Content

[0004] This application aims to solve the aforementioned technical problems.

[0005] Therefore, the purpose of this application is to propose a charger controlled by a Hall switch that can reduce standby power consumption.

[0006] To achieve the above objectives, this application discloses a charger controlled by a Hall switch, including a charging circuit and a charger housing 1. The charging circuit includes: a power input terminal, a Hall sensor connected to the power input terminal, a PMOS transistor connected in parallel with the Hall sensor, a charging management chip connected to the PMOS transistor, and an NPN transistor connected to both the PMOS transistor and the Hall sensor. The base of the NPN transistor is connected to the output terminal of the Hall sensor, and the emitter of the NPN transistor is grounded. A first voltage divider resistor is connected between the base of the NPN transistor and the output terminal of the Hall sensor, and the first voltage divider resistor is grounded. The source of the PMOS transistor is connected to the power input terminal, the drain is connected to the charging management chip, and the gate is connected to the collector of the NPN transistor. A charging coil 2 is disposed in the middle of the charger housing 1, and several magnets 3 are disposed around the charging coil 2. The Hall sensor in the charging circuit is disposed next to the charging coil 2.

[0007] In addition, the charger controlled by the Hall switch according to the above-described technical solution of this application may also have the following additional technical features:

[0008] Optionally, the Hall sensor is a bipolar Hall sensor.

[0009] Optionally, both the bipolar Hall sensor and the magnet 3 are perpendicular magnetic fields.

[0010] Optionally, a Zener diode is connected between the gate and source of the PMOS transistor.

[0011] Optionally, a second voltage-dividing resistor is connected between the power input terminal and the Hall sensor; a third voltage-dividing resistor is connected between the output terminal of the Hall sensor and the first voltage-dividing resistor; and a fourth voltage-dividing resistor is connected between the gate of the PMOS transistor and the collector of the NPN transistor.

[0012] Optionally, a shunt resistor is connected between the fourth voltage divider resistor and the power input terminal.

[0013] Optionally, the ground terminal of the Hall sensor is grounded separately.

[0014] Optionally, the magnet 3 is a neodymium iron boron magnet.

[0015] The advantages of this application are: 1. The charging management chip of the charger is controlled by a Hall switch, which reduces standby power consumption; 2. The control is stable; 3. The structure is simple and the production cost is low. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the charging circuit of a charger controlled by a Hall switch, provided in one embodiment of this application;

[0017] Figure 2 This is a circuit diagram of a charging circuit for a charger controlled by a Hall switch, provided in one embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the charger housing of a charger controlled by a Hall switch, provided in one embodiment of this application;

[0019] Figure 4 This is a circuit diagram of a charger controlled by a Hall switch in the prior art.

[0020] Figure label:

[0021] 1- Charger housing; 2- Charging coil; 3- Magnet; 4- Hall sensor. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or parts / elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0023] The following describes an embodiment of a charger controlled by a Hall switch, with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the charging circuit of a charger controlled by a Hall switch, provided in one embodiment of this application; Figure 2 This is a circuit diagram of a charging circuit for a charger controlled by a Hall switch, provided in one embodiment of this application; Figure 3 This is a schematic diagram of the charger housing of a charger controlled by a Hall switch, provided in one embodiment of this application. Figure 1-3 As shown: This charger, controlled by a Hall switch, includes a charging circuit and a charger housing 1. The charging circuit includes: a power input terminal VCC, a Hall sensor U4 connected to the power input terminal VCC, a PMOS transistor Q6 connected in parallel with the Hall sensor U4, a charging management chip connected to the PMOS transistor Q6, and an NPN transistor Q5 connected to both the PMOS transistor Q6 and the Hall sensor U4. The base of the NPN transistor Q5 is connected to the output terminal of the Hall sensor U4. The emitter of transistor 5 is grounded; a first voltage divider resistor R23 is connected between the base of the NPN transistor Q5 and the output terminal of the Hall sensor U4, and the first voltage divider resistor R23 is grounded; the source of the PMOS transistor Q6 is connected to the power input terminal VCC, the drain is connected to the charging management chip, and the gate is connected to the collector of the NPN transistor Q5; a charging coil 2 is provided in the middle of the charger housing 1, and several magnets 3 are provided around the charging coil 2; the Hall sensor 4 in the charging circuit is located next to the charging coil 2.

[0025] Specifically, when a portable electronic device with magnetic attraction is brought near the charger, the Hall sensor U4 detects the magnetic field on the electronic device and outputs a high level (selecting a high-level Hall sensor). The NPN transistor Q5 turns on, and the collector of the NPN transistor Q5 is at a low level. The PMOS transistor Q6 receives a reverse bias voltage and thus turns on, enabling the power management chip to receive power and start working.

[0026] A typical wireless charger has a magnet surrounding the charging coil. This application replaces one of the magnets with a Hall sensor 4, which ensures stable triggering when used in existing electronic devices.

[0027] According to the charger controlled by the Hall switch of this application, the high-power charging management chip is not powered on during standby. The charging management chip is only turned on to perform charging management when it is close to an electronic device that needs to be charged, which makes the standby power consumption of this circuit very low, and the control circuit is simple and low in cost.

[0028] According to one embodiment of this application, the Hall sensor U4 is a bipolar Hall sensor.

[0029] Specifically, electronic devices with wireless charging capabilities all have magnets at the charging location (depending on the phone brand and model, some are located inside the phone, while others are located on the phone case) to attract the charger, ensuring alignment and stability during charging. Since magnets inevitably have north and south poles, to avoid mismatched polarities in some models that could prevent the Hall sensor from being triggered correctly, a bipolar Hall sensor can be used. This eliminates the need for users to distinguish the magnet's orientation, making it easier to use. Of course, once relevant standards are established and the magnet polarity at the phone is clearly defined, a unipolar Hall sensor can also be used.

[0030] According to one embodiment of this application, both the bipolar Hall sensor and the magnet 3 are perpendicular magnetic fields.

[0031] Specifically, magnets 3 are positioned on both sides of the bipolar Hall sensor. Therefore, when both the bipolar Hall sensor and magnets 3 are in a vertical magnetic field, the side magnets 3 will not accidentally trigger the Hall sensor. The Hall sensor is only activated when the electronic device is close to the charger. The alignment magnet in the electronic device and the magnet 3 in the charger are matched and aligned. There is also a corresponding magnet in the vertical direction of the Hall switch. The Hall sensor is triggered by the magnetic field of this magnet.

[0032] According to one embodiment of this application, a Zener diode is connected between the gate and source of the PMOS transistor Q6.

[0033] Specifically, based on the triggering characteristics of PMOS transistor Q6, the voltage at VGS (the voltage between the gate and the source) needs to be kept stable. A Zener diode can be set to ensure voltage stability, thereby ensuring stable conduction of PMOS transistor Q6 and thus ensuring stable operation of the charging management chip.

[0034] According to one embodiment of this application, a second voltage divider resistor R24 ​​is connected between the power input terminal VCC and the Hall sensor U4; a third voltage divider resistor R21 is connected between the output terminal of the Hall sensor U4 and the first voltage divider resistor R23; and a fourth voltage divider resistor R5 is connected between the gate of the PMOS transistor Q6 and the collector of the NPN transistor.

[0035] Specifically, to facilitate product reliability during design and application, a second voltage divider resistor R24, a third voltage divider resistor R21, and a fourth voltage divider resistor R5 can be set in the appropriate positions to reduce the risk of voltage fluctuations in the direct-connected VCC design.

[0036] According to one embodiment of this application, a shunt resistor R22 is connected between the fourth voltage divider resistor R5 and the power input terminal VCC.

[0037] Specifically, when the charger is enabled, PMOS transistor Q6 is turned on, and R22 acts as a shunt resistor; while when the charger is in standby mode, since PMOS transistor Q6 is triggered according to VGS, connecting a resistor R22 in parallel between the gate and source can ensure the stable triggering of PMOS transistor Q6.

[0038] According to one embodiment of this application, the ground terminal of the Hall sensor U4 is grounded separately.

[0039] Specifically, to ensure the safe operation of the Hall sensor U4, its grounding terminal can be grounded separately.

[0040] According to one embodiment of this application, the magnet 3 is a neodymium iron boron magnet.

[0041] Specifically, neodymium iron boron magnets have advantages such as ultra-high magnetic properties, lightweight, and high cost-effectiveness, making them an ideal choice for modern high-performance applications.

[0042] The above embodiments are preferred implementations of this application. In addition, this application can be implemented in other ways. Any obvious substitutions without departing from the concept of this application are within the protection scope of this application.

Claims

1. A charger controlled by a Hall switch, characterized in that, include: Charging circuit and charger housing (1); The charging circuit includes: a power input terminal, a Hall sensor connected to the power input terminal, a PMOS transistor connected in parallel with the Hall sensor, a charging management chip connected to the PMOS transistor, and an NPN transistor connected to both the PMOS transistor and the Hall sensor. The base of the NPN transistor is connected to the output terminal of the Hall sensor, and the emitter of the NPN transistor is grounded; a first voltage divider resistor is connected between the base of the NPN transistor and the output terminal of the Hall sensor, and the first voltage divider resistor is grounded. The source of the PMOS transistor is connected to the power input terminal, the drain is connected to the charging management chip, and the gate is connected to the collector of the NPN transistor. A charging coil (2) is provided in the middle of the charger housing (1), and several magnets (3) are provided around the charging coil (2). The Hall sensor (4) in the charging circuit is located next to the charging coil (2).

2. The charger controlled by a Hall switch according to claim 1, characterized in that: The Hall sensor is a bipolar Hall sensor.

3. A charger controlled by a Hall switch according to claim 2, characterized in that: Both the bipolar Hall sensor and the magnet (3) are perpendicular magnetic fields.

4. A charger controlled by a Hall switch according to claim 1, characterized in that: A Zener diode is connected between the gate and source of the PMOS transistor.

5. A charger controlled by a Hall switch according to claim 1, characterized in that: A second voltage divider resistor is connected between the power input terminal and the Hall sensor; A third voltage divider resistor is connected between the output terminal of the Hall sensor and the first voltage divider resistor. A fourth voltage divider resistor is connected between the gate of the PMOS transistor and the collector of the NPN transistor.

6. A charger controlled by a Hall switch according to claim 5, characterized in that: A shunt resistor is connected between the fourth voltage divider resistor and the power input terminal.

7. A charger controlled by a Hall switch according to claim 1, characterized in that: The grounding terminal of the Hall sensor is grounded separately.

8. A charger controlled by a Hall switch according to claim 1, characterized in that: The magnet (3) is a neodymium iron boron magnet.

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