PD rapid charger

Abstract

The utility model provides a PD quick charger, which comprises an AC-DC circuit for converting commercial power into direct current, and a current and voltage output control circuit for adjusting current and voltage for charging according to protocol requirements, and the current and voltage output control circuit is electrically connected with a rechargeable battery through a USB A port or a USB C port; the AC-DC circuit is arranged on the same mainboard, and the mainboard circuit is provided with an OCP, an OVP and an OTP; the power intelligent distribution protocol MCU is independently arranged on a small board, the power intelligent distribution protocol MCU is connected with a port A or a port C of the output convertible board, the current and voltage output control circuit is controlled to be connected, and the USB port A or the USB port C charges the rechargeable battery according to protocol requirements. By adopting the scheme of the utility model, the requirements of different clients can be met through one-time design, the safety certification cost is low, the same mainboard does not have excessive mainboard overstock in the actual production process, the purchase cost of a company is convenient to control, the same main circuit is convenient to control the production, and the management cost and the labor cost are saved invisibly.

Description

Technical Field

[0001] The utility model relates to the field of fast charging, in particular to a PD fast charger. Background Art

[0002] PD stands for Power Delivery, which means power delivery management in Chinese. The PD charging protocol is a power delivery protocol announced by the USB-IF organization. USB-Power Delivery can increase the Type-C interface to 100W. USB-Power Delivery is one of the mainstream fast charging protocols. It is a fast charging specification developed by the USB-IF organization. USB PD increases power delivery through USB cables and connectors, and expands the cable bus power supply capacity in USB applications. This specification can achieve higher voltage and current, with a maximum power delivery of 100 watts, and can freely change the direction of power delivery.

[0003] The current PD power adapter generally has two interfaces, USB A interface and USB C interface. From the perspective of function definition, the core function of the PD power adapter is PD fast charging.

[0004] As the technology of current consumer electronic products is changing with each passing day, and the ideas of green environmental protection and energy saving are gradually gaining popularity, the market for efficient and energy-saving fast charging chargers is extremely hot. In order to meet the needs of different customers, there are different types of chargers on the market, such as single C; A+C; dual C; 2C+1A; if the products are sold on the market, they must undergo safety certification. If the above 4 products are certified separately, the certification test fee will be the cost of 4 products, which will increase the cost of new products and is not conducive to the promotion of new products.

[0005] Due to the improvement of PWM IC technology (Vcc voltage operating range 7.5-90V), the same circuit topology design can be used to meet the design of four models; that is, the main circuit of the four products uses the same circuit. Utility Model Content

[0006] The utility model aims to solve the problem that different chargers need to be individually certified and tested when they are newly launched, which increases the cost. The utility model provides a PD fast charger, which adopts the same circuit topology to realize single C; A+C; dual C; 2C+1A fast modes.

[0007] The technical solution adopted by the utility model to achieve the above technical requirements is: a PD fast charger, including: an AC-DC circuit that converts AC power into direct current, a current and voltage output control circuit that adjusts the current and voltage of charging according to protocol requirements, and the current and voltage output control circuit is electrically connected to the rechargeable battery using a USB A port or a USB C port; the AC-DC circuit and the current and voltage output control circuit are arranged on the same mainboard, and the mainboard also includes a power intelligent distribution protocol MCU, the power intelligent distribution protocol MCU is connected to the current and voltage output control circuit, and controls the current and voltage output control circuit to be connected to the USB A port or the USB C port to charge the rechargeable battery according to the protocol requirements.

[0008] Furthermore, in the above-mentioned PD fast charger: the AC-DC circuit includes a rectifier filter circuit and a voltage stabilization output circuit; the voltage stabilization output circuit includes a flyback transformer, a synchronous rectifier controller, a voltage stabilizer, and a feedback control circuit;

[0009] The source end of the flyback transformer is connected to the DC output end of the rectifier and filter circuit, and the secondary end is connected to a synchronous rectifier controller, a voltage stabilizer, and a feedback control circuit in sequence.

[0010] Furthermore, in the above-mentioned PD fast charger: the synchronous rectification controller includes a switch tube Q1 arranged between the secondary out-of-phase end of the flyback transformer T1 and the ground, and the switch tube Q1 is controlled by a synchronous rectification controller chip U3 of model JW7726B.

[0011] Furthermore, in the above-mentioned PD fast charger: the voltage regulator circuit includes a voltage reference chip U4 arranged between the secondary side output terminal of the flyback transformer T1 and the ground, and its model is CJ341.

[0012] Furthermore, in the above-mentioned PD fast charger: the feedback control circuit includes an optocoupler U2 and a gallium nitride packaged chip U1 of model JW1565, the two ends of the source side of the optocoupler U2 are respectively connected to the in-phase end of the secondary side of the flyback transformer T1 and the K end of the voltage reference chip U4, the secondary end is connected to pin No. 6 of the gallium nitride packaged chip U1, and the 1st and 2nd pins of the gallium nitride packaged chip U1 are connected to the out-of-phase end of the primary side of the flyback transformer T1.

[0013] Furthermore, in the above-mentioned PD fast charger: the current and voltage output control circuit includes a fast charging protocol chip U5 of model SW3516.

[0014] Furthermore, in the above-mentioned PD fast charger: the power intelligent distribution protocol MCU adopts a power intelligent distribution protocol MCU of model MSOP10, and the power intelligent distribution protocol MCU generates a control signal for controlling the fast charging protocol chip U5.

[0015] By adopting the solution of the utility model, different customer requirements can be solved with one design, the cost of safety certification is low, and in the actual production process, there will not be too many motherboards in stock, which is convenient for the company's procurement cost control. The same main circuit is convenient for production control, and management expenses and labor costs are also saved invisibly.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is a structural block diagram of a PD fast charger according to Embodiment 1 of the present utility model;

[0018] Attached Figure 2 This is the AC-DC circuit schematic diagram of Embodiment 1 of the present utility model;

[0019] Attached Figure 3 This is a schematic diagram of a current and voltage output control circuit according to an embodiment of the utility model;

[0020] Attached Figure 4 It is a schematic diagram of the MCU circuit of the power intelligent distribution protocol of the embodiment of the utility model. DETAILED DESCRIPTION

[0021] Embodiment 1, this embodiment is a PD fast charger, such as Figure 1 As shown in the figure, the PD fast charger includes three main circuit modules: AC-DC circuit, current and voltage output control circuit and power intelligent distribution protocol MCU. The power intelligent distribution protocol MCU interacts with the charged device through the interface to obtain the relevant parameters of the charging protocol, and controls the current and voltage output control circuit to output the appropriate current and voltage to quickly charge the rechargeable battery. Since these circuits can be combined with different output interfaces, a variety of charger products such as single C; A+C; dual C; 2C+1A, etc. can be produced. Using these circuits to design and solve different customer requirements at one time, the safety certification cost is low. In the actual production process, there will not be too many motherboards on the same motherboard, which is convenient for the company's procurement cost control. The same main circuit is convenient for production control, and it also saves management costs and labor costs.

[0022] The AC-DC circuit is a module that uses the mains to generate direct current. In this embodiment, it is a 21VDC power supply. Figure 2 As shown, the AC-DC circuit in this embodiment includes a rectifier filter circuit and a voltage stabilizing output circuit; the rectifier filter circuit and the voltage stabilizing output circuit are arranged on both sides of the source side and the secondary side of the flyback transformer.

[0023] like Figure 2As shown, the L phase and N phase of the AC power are respectively connected to the two input pins of a common film inductor LF1. The signals output by the two output pins of the common film inductor LF1 are shaped by a shaping network composed of capacitors and resistors and then enter the rectifier block BD1 to rectify and output a DC signal. Then, it is filtered by a filter (π-type filter) composed of capacitors EC1, EC2, inductor L1A and resistor R33, and then the output DC signal is connected to the same phase end of the primary side of the flyback transformer after being grounded through some capacitors EC3 and EC4. A voltage control device is set at the out-of-phase end of the primary side coil.

[0024] The secondary side of the flyback transformer has circuits such as a synchronous rectification controller, a voltage regulator, and a feedback control circuit.

[0025] Synchronous rectifier controller such as Figure 2 As shown: it includes a switch tube Q1 set between the secondary out-of-phase end of the flyback transformer T1 and the ground. The switch tube Q1 is controlled by a synchronous rectifier controller chip U3 of model JW7726B. The rectifier controller chip U3 is used to control the opening and closing of the switch tube Q1. That is, the duty cycle of the PWM signal output by the rectifier controller chip U3 can control the output voltage of the AC-DC circuit. In this embodiment, the rectifier controller chip U3 generates a PWM signal to control the opening and closing time of the switch tube Q1, so that the DC-DC circuit outputs 21VDC. Figure 2 As shown, the switch tube Q1 is arranged between the out-of-phase end of the secondary coil of the flyback transformer T1 and the ground, and its G pole is connected to the No. 5 pin of the rectifier controller chip U3, that is, the GT pin, and the SW pin of the rectifier controller chip U3 is connected to the S pole of the switch tube Q1 after being connected in series with the resistor R35, and the VCC pin is connected to the D pole of the switch tube Q1 after being isolated by the capacitor C5, and the remaining pins of the rectifier controller chip U3, such as the VO pin, are connected to the in-phase end of the secondary coil of the flyback transformer T1, GND is directly grounded, and MOT is connected to the ground after being connected in series with the resistor R36.

[0026] An AC-DC circuit that converts AC power into direct current, and a current and voltage output control circuit that adjusts the current and voltage for charging according to protocol requirements, wherein the current and voltage output control circuit is electrically connected to a rechargeable battery using a USB A port or a USB C port; characterized in that: the AC-DC circuit and the current and voltage output control circuit are arranged on the same mainboard, and the mainboard also includes a power intelligent distribution protocol MCU, the power intelligent distribution protocol MCU is connected to the current and voltage output control circuit, and controls the current and voltage output control circuit to be connected to the USB A port or the USB C port to charge the rechargeable battery according to the protocol requirements.

[0027] The regulator circuit is at the output, such as Figure 2As shown, the circuit includes a voltage reference chip U4, which is set between the secondary output terminal of the flyback transformer T1 and the ground. Its model is CJ341. The voltage reference chip U4 can output accurate voltage. The K terminal and R terminal of the voltage reference chip U4 are respectively connected in series with resistors R38 and R40 to the output terminal VIN, which is actually the same phase terminal as the secondary coil of the flyback transformer. In addition, a capacitor C45 is set between the K terminal and the R terminal of the voltage reference chip U4, and there is a series circuit of capacitor C44 and resistor R41. A parallel circuit of capacitor R43 and resistor R42 is also connected in series between the R terminal and the ground, and the A terminal of the voltage reference chip U4 is grounded.

[0028] The feedback control circuit is a feedback circuit that controls the switches disposed between the grounded non-phase ends of the primary coil of the flyback transformer, such as Figure 2 As shown, the circuit includes an optocoupler U2 and a JW1565 gallium nitride package chip U1. The two ends of the source side of the optocoupler U2 are respectively connected to the in-phase end of the secondary side of the flyback transformer T1 and the K end of the voltage reference chip U4. The secondary end is connected to the No. 6 pin of the gallium nitride package chip U1. The first and second pins of the gallium nitride package chip U1 are connected to the primary side out-of-phase end of the flyback transformer T1. The optocoupler U2 is used to change the current of the phototransistor through the current of the light-emitting diode, thereby changing the duty cycle of the PWM signal that controls the opening and closing of the switch tube in the gallium nitride package chip U1, that is, changing the duty cycle of the primary switch tube.

[0029] The function of the current and voltage output control circuit is to control the current and voltage of the 21VDC power supply output by the AC-DC circuit as needed. The output is connected to the charging interface. The output current and voltage comply with the PD fast charging protocol, such as Figure 3 As shown, it includes a fast charging protocol chip U5 with model number SW3516. Technical personnel in this field can build various charging circuits according to the information of the fast charging protocol chip U5, such as single C; A+C; dual C; 2C+1A, etc.

[0030] Power intelligent distribution protocol MCU such as Figure 4 As shown, it adopts the power intelligent distribution protocol MCU model MSOP10, and the power intelligent distribution protocol MCU generates a control signal for controlling the fast charging protocol chip U5.

Claims

1. A PD fast charger, comprising: An AC-DC circuit that converts AC power into direct current, and a current and voltage output control circuit that adjusts the current and voltage for charging according to protocol requirements, wherein the current and voltage output control circuit is electrically connected to a rechargeable battery using a USB A port or a USB C port; characterized in that: the AC-DC circuit and the current and voltage output control circuit are arranged on the same mainboard, and the mainboard also includes a power intelligent distribution protocol MCU, the power intelligent distribution protocol MCU is connected to the current and voltage output control circuit, and controls the current and voltage output control circuit to be connected to the USB A port or the USB C port to charge the rechargeable battery according to the protocol requirements.

2. The PD fast charger according to claim 1, characterized in that: The AC-DC circuit includes a rectifier filter circuit and a voltage stabilization output circuit; the voltage stabilization output circuit includes a flyback transformer, a synchronous rectifier controller, a voltage stabilizer, and a feedback control circuit; The source end of the flyback transformer is connected to the DC output end of the rectifier and filter circuit, and the secondary end is connected to a synchronous rectifier controller, a voltage stabilizer, and a feedback control circuit in sequence.

3. The PD fast charger according to claim 2, characterized in that: The synchronous rectification controller includes a switch tube Q1 arranged between the secondary out-of-phase end of the flyback transformer T1 and the ground. The switch tube Q1 is controlled by a synchronous rectification controller chip U3 of model JW7726B.

4. The PD fast charger according to claim 3, characterized in that: The voltage regulator circuit includes a voltage reference chip U4 arranged between the secondary output terminal of the flyback transformer T1 and the ground, and its model is CJ341.

5. The PD fast charger according to claim 4, characterized in that: The feedback control circuit includes an optocoupler U2 and a gallium nitride package chip U1 of model JW1565. The two ends of the source side of the optocoupler U2 are respectively connected to the in-phase end of the secondary side of the flyback transformer T1 and the K end of the voltage reference chip U4, the secondary end is connected to the No. 6 pin of the gallium nitride package chip U1, and the 1st and 2nd pins of the gallium nitride package chip U1 are connected to the out-of-phase end of the primary side of the flyback transformer T1.

6. The PD fast charger according to any one of claims 1 to 5, characterized in that: The current and voltage output control circuit includes a fast charging protocol chip U5 with model number SW3516.

7. The PD fast charger according to claim 6, characterized in that: The power intelligent distribution protocol MCU adopts a power intelligent distribution protocol MCU of model MSOP10, and the power intelligent distribution protocol MCU generates a control signal for controlling the fast charging protocol chip U5.

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