Switching circuit of ultra-thin switching power supply for wireless charging Qi2.2 sound equipment

Abstract

The utility model discloses a switching circuit meeting a wireless charging Qi2.2 sound equipment ultrathin switching power supply. The switching circuit comprises a sealed gallium nitride chip U5, an input circuit based on the sealed gallium nitride chip U5, a switching circuit based on the sealed gallium nitride chip U5 and an output circuit based on the sealed gallium nitride chip U5, and the model of the sealed gallium nitride chip U5 is CX8452. A plurality of devices are integrated in one package, so that the number of peripheral devices is reduced, the circuit design is simplified, and the integration level is high; the gallium nitride material has the characteristics of low conduction loss and high switching frequency, and the power supply conversion efficiency is further improved after the gallium nitride material is sealed; high integration makes development and design convenient, debugging is fast, and the product research and development period is shortened.

Description

Technical Field

[0001] This utility model relates to the field of switching circuit technology, and in particular to a conversion circuit that meets the requirements of a wireless charging Qi2.2 speaker ultra-thin switching power supply. Background Technology

[0002] To meet the Qi 2.2 wireless charging standard, the phone sends data packets via a coil to the wireless charging chip to determine the required power. The chip then decodes these packets and sends the corresponding power output. This necessitates a switching power supply that provides a set of transformed DC voltages. Traditional discrete components are bulky and cannot meet the design requirements of ultra-thin switching power supplies. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a conversion circuit that meets the requirements of a wireless charging Qi2.2 speaker ultra-thin switching power supply, solving the problems of large size and low efficiency of traditional solutions, and is compatible with the Qi2.2 protocol and adapted to the ultra-thin requirements of speaker equipment.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a conversion circuit for a wireless charging Qi2.2 speaker ultra-thin switching power supply, including a packaged gallium nitride chip U5, an input circuit based on the packaged gallium nitride chip U5, a conversion circuit based on the packaged gallium nitride chip U5, and an output circuit based on the packaged gallium nitride chip U5; the model of the packaged gallium nitride chip U5 is CX8452;

[0005] Input circuit: The encapsulated gallium nitride chip U5 is connected to the external power input through pins 2, 4, 29, 30, 31 and 32. Pins 29, 30, 31 and 32 are combined and connected to the filter capacitor C15. Pin 2 is connected to the filter capacitor C18. Pin 8 of the encapsulated gallium nitride chip U5 is connected to the bypass capacitor C24.

[0006] Conversion circuit: Pins 21 and 28 of the encapsulated gallium nitride chip U5 are switching nodes. Pin 28 is connected to an LC filter circuit composed of inductor L2 and capacitor C13. Pin 21 is connected to one end of resistor R29 through capacitor C16. Pin 23 of the encapsulated gallium nitride chip U5 is connected to one end of resistor R29 through diode D4. The other end of resistor R29 is connected to pin 1 of the encapsulated gallium nitride chip U5.

[0007] Output circuit: Pin 22 of the encapsulated gallium nitride chip U5 is the output terminal, providing a stable DC voltage to the load; the output voltage is sampled through voltage division by resistors R33 and R35 and fed back to pin 17 of the encapsulated gallium nitride chip U5 to adjust the duty cycle of the PWM signal and stabilize the output voltage.

[0008] As an improvement, the output terminal of the inductor L2 is connected to the capacitor C13 and the current sensing resistor RCS1, respectively.

[0009] As an improvement, pin 7 of the encapsulated gallium nitride chip U5 is an enable pin, pin 7 is grounded through resistor R34, and pin 7 is connected to an external power supply through resistor R32.

[0010] As an improvement, pin 7 of the encapsulated gallium nitride chip U5 is used to select the chip's operating mode.

[0011] The beneficial effects of this utility model compared with the prior art are:

[0012] Using co-packaged gallium nitride chips: Integrating multiple devices into one package reduces the number of external components, simplifies circuit design, and achieves high integration; gallium nitride material itself has low conduction loss and high switching frequency characteristics, and co-packaging further improves power conversion efficiency; high integration makes development and design convenient, debugging quick, and shortens product development cycle. Attached Figure Description

[0013] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figure 1 As shown, a conversion circuit for an ultra-thin switching power supply that meets the requirements of Qi2.2 wireless charging audio is provided. This circuit includes a packaged gallium nitride (GaN) chip U5, an input circuit based on the packaged GaN chip U5, a conversion circuit based on the packaged GaN chip U5, and an output circuit based on the packaged GaN chip U5. The model number of the packaged GaN chip U5 is CX8452.

[0016] Input circuit: The encapsulated gallium nitride chip U5 is connected to the external power input via pins 2, 4, 29, 30, 31, and 32. Pins 29, 30, 31, and 32 are combined and connected to filter capacitor C15, and pin 2 is connected to filter capacitor C18 to filter and remove high-frequency noise in the power supply and stabilize the power supply voltage. Pin 8 "VDD" of the encapsulated gallium nitride chip U5 is connected to bypass capacitor C24 to provide the core power supply of 5.4V to the chip, reducing power supply noise interference.

[0017] Conversion circuit: Pins 21 and 28 "SW" of the encapsulated gallium nitride chip U5 are switching nodes. The switching is controlled by the PWM signal inside the chip to achieve voltage conversion. Pin 28 is connected to an LC filter circuit composed of inductor L2 and capacitor C13 to filter the voltage output by the switch and output a smooth DC voltage. Pin 21 is connected to one end of resistor R29 through capacitor C16. Pin 23 of the encapsulated gallium nitride chip U5 is connected to one end of resistor R29 through diode D4. The other end of resistor R29 is connected to pin 1 "BST" of the encapsulated gallium nitride chip U5.

[0018] Output circuit: Pin 22 of the packaged gallium nitride chip U5 is the output terminal, providing a stable DC voltage to the load; the output voltage is sampled through voltage division by resistors R33 and R35 and fed back to pin 17 "VFB" of the packaged gallium nitride chip U5 to adjust the duty cycle of the PWM signal and stabilize the output voltage.

[0019] Protection and control circuit: The output terminal of the inductor L2 is connected to the capacitor C13 and the current sensing resistor RCS1 respectively. The current sensing resistor RCS1 detects the circuit current. When the current exceeds the set value, the chip will take protective measures to limit the current. Pin 7 of the encapsulated gallium nitride chip U5 is the enable pin. Pin 7 is grounded through resistor R34 and connected to the external power supply through resistor R32. The high and low levels of this pin can control the chip's operating state. A high level enables the chip to work, and a low level shuts down the chip. Pin 7 "MODE" of the encapsulated gallium nitride chip U5 is used to select the chip's operating mode and set different operating parameters in conjunction with the peripheral circuit.

Claims

1. A conversion circuit for a Qi 2.2 wireless charging audio ultra-thin switching power supply, characterized in that: It includes a packaged gallium nitride chip U5, an input circuit based on the packaged gallium nitride chip U5, a conversion circuit based on the packaged gallium nitride chip U5, and an output circuit based on the packaged gallium nitride chip U5; the model of the packaged gallium nitride chip U5 is CX8452; Input circuit: The encapsulated gallium nitride chip U5 is connected to the external power input through pins 2, 4, 29, 30, 31 and 32. Pins 29, 30, 31 and 32 are combined and connected to the filter capacitor C15. Pin 2 is connected to the filter capacitor C18. Pin 8 of the encapsulated gallium nitride chip U5 is connected to the bypass capacitor C24. Conversion circuit: Pins 21 and 28 of the encapsulated gallium nitride chip U5 are switching nodes. Pin 28 is connected to an LC filter circuit composed of inductor L2 and capacitor C13. Pin 21 is connected to one end of resistor R29 through capacitor C16. Pin 23 of the encapsulated gallium nitride chip U5 is connected to one end of resistor R29 through diode D4. The other end of resistor R29 is connected to pin 1 of the encapsulated gallium nitride chip U5. Output circuit: Pin 22 of the encapsulated gallium nitride chip U5 is the output terminal, providing a stable DC voltage to the load; the output voltage is sampled through voltage divider resistors R33 and R35 and fed back to pin 17 of the encapsulated gallium nitride chip U5 to adjust the duty cycle of the PWM signal and stabilize the output voltage.

2. The conversion circuit of claim 1, wherein the conversion circuit is a Qi2.2 wireless charging audio ultra-thin switching power supply. The output terminal of the inductor L2 is connected to the capacitor C13 and the current sensing resistor RCS1, respectively.

3. The conversion circuit satisfying the ultra-thin switching power supply of the wireless charging Qi2.2 sound according to claim 1, characterized in that: Pin 7 of the encapsulated gallium nitride chip U5 is the enable pin. Pin 7 is grounded through resistor R34 and connected to an external power supply through resistor R32.

4. The conversion circuit of claim 1, wherein the conversion circuit is a Qi2.2 wireless charging audio ultra-thin switching power supply. Pin 7 of the encapsulated gallium nitride chip U5 is used to select the chip's operating mode.

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