CN211830310U

CN211830310U - Digital quick charging circuit

Info

Publication number: CN211830310U
Application number: CN202020801363.6U
Authority: CN
Inventors: 杨丽
Original assignee: Shenzhen Hehuiyuan Electronic Technology Co ltd
Current assignee: Shenzhen Hehuiyuan Electronic Technology Co ltd
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2020-10-30
Anticipated expiration: 2030-05-14

Abstract

The utility model provides a digital quick charging circuit, including electric connection's AC input circuit in proper order, the EMC circuit, rectification filter circuit, still include electric connection's PWM control converting circuit in proper order, keep apart the step-down circuit, synchronous rectification is filtered and is prevented flowing backward circuit and DC output circuit, further still include MCU control circuit, this MCU control circuit electric connection is between PWM control converting circuit and synchronous rectification filtering and prevent flowing backward circuit, DC output circuit and the connected mode by battery charging outfit include I2C, I2S, SPI, UART, CAN charging protocol's arbitrary combination, compatible Type-C, DFP, PD2.0/3.0, PPS, QC3.0/2.0, FCP, SC, PMTK +1.1/2.0/Apple 24A, quick charging protocols such as samsung 2A. By adopting the digital quick charging circuit, not only can different intelligent terminal devices realize quick charging, but also can realize accurate quick charging, saves time and electric power, effectively reduces the heat in the working process of the circuit, and improves the safety and reliability of the system.

Description

Digital quick charging circuit

Technical Field

The invention relates to a charging circuit, in particular to a digital quick charging circuit.

Background

The consumption and the demand of the electric quantity caused by the intelligent electronic equipment are suddenly increased, the analog quick charging circuit is better and more expensive, and the problem of slow charging is solved. However, due to the fact that the types and the models of intelligent electronic products are various and complicated, a plurality of new problems occur in the compatibility of the charger, and the traditional quick charging circuit adopts analog feedback, and has the problems of large error, slow response, poor precision, high energy consumption, serious heating and the like.

Chinese patent application No. 2019203358172 proposes a charger that fills soon with automatic overcurrent, overvoltage protection function, but this charger that fills soon does not adopt the design improvement heat dissipation function of circuit itself, but adopts physics modes such as the heat-conducting plate of physics, radiating groove to dispel the heat, and the radiating effect is relatively poor to do not adopt digital interface to carry out circuit optimization, consequently, can not adapt to current market demand that fills soon.

In view of this, there is a need to develop a digital fast charging circuit which has a reasonable circuit design and a simple structure, automatically adapts to various digital interface protocols, can realize fast charging and accurate fast charging of different intelligent terminal devices, saves time and power, effectively reduces heat in the working process of the circuit, and improves the safety and reliability of the system.

Disclosure of Invention

The invention aims to provide a quick charging circuit with a digital interface, and the technical scheme of the invention is as follows:

the utility model provides a digital quick charge circuit, includes electric connection's AC input circuit in proper order, EMC circuit, rectification filter circuit, its characterized in that still includes electric connection's PWM control converting circuit in proper order, keeps apart the step-down circuit, and synchronous rectification is filtered and is prevented flowing backward circuit and direct current output circuit, further still includes MCU control circuit, and this MCU control circuit electric connection is between PWM control converting circuit and synchronous rectification filter and prevent flowing backward circuit.

Further, the PWM control conversion circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, and a diode D2.

Further, the capacitor C3 is a variable capacitor.

Furthermore, the synchronous rectification and backflow prevention circuit is composed of a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a diode D3, a triode Q1 and a triode Q2.

Furthermore, the capacitor C5 and the capacitor C6 are variable capacitors.

Further, the MCU control circuit is composed of a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R15, a bidirectional diode SD1, and a bidirectional diode SD 2.

Furthermore, the connection mode of the direct current output circuit and the charged device comprises any combination of I2C, I2S, SPI, UART and CAN charging protocols.

Furthermore, the memory of the MCU control circuit is compatible with any combination of Type-C, DFP, PD2.0/3.0, PPS, QC3.0/2.0, FCP, SC, PMTK +1.1/2.0/Apple 24A and Samsung 2A.

The digital quick charging circuit can automatically adapt to various digital interface protocols, can realize quick charging of different intelligent terminal devices, can realize accurate quick charging, saves time and electric power, effectively reduces the heat in the working process of the circuit, and improves the safety and reliability of the system.

Drawings

FIG. 1: the digital quick charging circuit of the invention forms a block diagram.

FIG. 2: the PWM control conversion circuit of the invention is composed of a schematic diagram.

FIG. 3: the invention discloses a schematic diagram of a synchronous rectification and backflow prevention circuit.

FIG. 4: the MCU control circuit of the invention is composed of a schematic diagram.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

Referring to fig. 1, the digital fast charging circuit of the present invention is a block diagram, which mainly comprises an ac input circuit 101, an EMC circuit 102, a rectifying filter circuit 103, a PWM control conversion circuit 104, an isolation step-down circuit 105, a synchronous rectifying filter and anti-backflow circuit 106 and a dc output circuit 108, which are electrically connected in sequence, and an MCU control circuit 107 is electrically connected between the PWM control conversion circuit 104 and the synchronous rectifying filter and anti-backflow circuit 106.

Referring to fig. 2, a schematic diagram of the PWM control conversion circuit of the present invention is shown, the PWM control conversion circuit 104 is composed of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, and a diode D2, wherein the capacitor C3 is a variable capacitor. The resistor R1 is connected with the capacitor C1 in parallel and then connected with the diode D1 and the resistor R2 in series, and then connected with the capacitor C2 in parallel to a pin of the MCU chip U1. The resistor R3, the resistor R4, the capacitor C3 and the capacitor C4 are connected in series, wherein the resistor R4 is connected with the diode D2 in parallel and then connected to a pin of the MCU chip U1, and the resistor R5, the resistor R6 and the resistor R7 are connected in series and then connected to a pin of the MCU chip U1.

Referring to fig. 3, a schematic diagram of a synchronous rectification and backflow prevention circuit of the present invention is shown, the synchronous rectification and backflow prevention circuit is composed of a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a diode D3, a transistor Q1, and a transistor Q2, wherein the capacitor C5 and the capacitor C6 are variable capacitors. A resistor R12, a resistor R8, a capacitor C7, a resistor R9 and a resistor R14 are sequentially connected in series and then respectively connected with two pins of an MCU chip U1 at two ends, one end of the resistor R13 is connected with a pin of U1, the other end of the resistor R13 is connected with an emitter of a triode Q1, a base and a collector of the triode Q1 are respectively connected with one ends of a resistor R12 and a capacitor C7, one end of a capacitor C8 is connected with a pin of U1, the other end of the capacitor C7, and a resistor R10 is connected with the resistor R9 in parallel; one end of a capacitor C9 is connected with the resistor R14, the other end of the capacitor C9 is connected with the resistor R9, the capacitor C8 is further connected with one end of a capacitor C5, and the capacitor C9 is further connected with one end of a capacitor C6; one end of the capacitor C10 is connected with the C6, the other end is connected with the collector of the triode Q2 and further connected with the pin of the U1, and the base and the emitter of the triode Q2 are respectively connected with the pin of the U1 after the resistor R11 and the diode D3.

Referring to fig. 4, the MCU control circuit of the present invention is schematically composed of a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R15, a bidirectional diode SD1, and a bidirectional diode SD 2. One end of the capacitor C11, the capacitor C12 and the resistor R15 are connected in parallel to be connected to pins of the chip U1 and the chip U2, and the other end of the capacitor C11, the capacitor C12 and the resistor R15 are grounded; one end of the capacitor C13 is grounded after being connected in parallel with the bidirectional diode SD1, and the other end of the capacitor C13 is connected to a pin of the U2; the capacitor C14 is connected in parallel with the bidirectional diode SD2, then one end is grounded, the other end outputs direct current voltage to supply to the charging equipment for charging, and the connection mode of the output end and the charged equipment comprises any combination of common charging protocols such as I2C, I2S, SPI, UART, CAN and the like.

As a part of the present invention, the chip U1 and the chip U2 may be common charging control chips, and each pin of the chips meets the common charging interface definition standard, which is not limited in the present invention.

The working process of the digital quick charging circuit of the invention is as follows:

an external alternating current mains supply enters an alternating current input circuit 101, enters a digital quick charging circuit, is corrected by an EMCI circuit 102, flows into a rectifying and filtering circuit 103 to become a similar direct current voltage, and further flows into a PWM control conversion circuit 104, namely a circuit consisting of a chip U1 partial pin, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1 and a diode D2, wherein the PWM control conversion circuit 104 realizes the following functions: PWM control conversion, digital control of a charging interface and feedback adjustment response of the MCU.

The voltage processed by the PWM control conversion circuit 104 is connected to an isolation step-down circuit 105, and the isolation step-down circuit 105 is used to isolate the input voltage from the output voltage, thereby generating a safe isolated low voltage.

Further, the voltage processed by the isolated voltage-dropping circuit 105 is input to the synchronous rectification filtering and backflow prevention circuit 106, and the synchronous rectification filtering and backflow prevention circuit 106 is composed of part of pins of the chip U1, and a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a diode D3, a triode Q1, and a triode Q2, wherein the capacitor C5 and the capacitor C6 are variable capacitors. The synchronous rectification filtering and backflow preventing circuit 106 is used for completing data exchange and realization of output design parameters issued by the MCU, outputting direct current voltage and current meeting design requirements, and has the capability of being controlled by data communication of a post-stage circuit.

The voltage processed by the synchronous rectification filtering and backflow preventing circuit 106 enters an MCU Control circuit 107, a memory, a flash memory and a Micro Control Unit (MCU) are arranged in the MCU Control circuit 107, the memory stores the currently common digital interface protocols of Type-C, DFP, PD2.0/3.0, PPS, QC3.0/2.0, FCP, SC, PMTK +1.1/2.0/Apple 24A, Samsung 2A and the like, the MCU Control circuit 107 is automatically initialized and reset under the condition of supplying power voltage, the voltage and the current of a power supply are detected, data communication with the power supply is carried out, the collection and the detection of data flow are ensured to be real and effective, the MCU Control circuit 107 also carries out data communication identification with a circuit of a charged device, the data flow in the working process is transmitted to the charged device through a data interface, and the quick charging work and the safe charging of the circuit power supply are realized.

By adopting the digital quick charging circuit, not only can different intelligent terminal devices realize quick charging, but also can realize accurate quick charging, saves time and electric power, effectively reduces the heat in the working process of the circuit, and improves the safety and reliability of the system.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention, and all the equivalent alternatives, modifications and equivalent structural changes that can be obtained by a person skilled in the art in limited experiments or according to the technical essence of the present invention and the above embodiments are still within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a digital quick charge circuit, includes electric connection's AC input circuit in proper order, EMC circuit, rectification filter circuit, its characterized in that still includes electric connection's PWM control converting circuit in proper order, keeps apart the step-down circuit, and synchronous rectification is filtered and is prevented flowing backward circuit and direct current output circuit, further still includes MCU control circuit, and this MCU control circuit electric connection is between PWM control converting circuit and synchronous rectification filter and prevent flowing backward circuit.

2. The digital fast charging circuit as claimed in claim 1, wherein the PWM control converting circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, and a diode D2.

3. The digital fast charging circuit as claimed in claim 2, wherein said capacitor C3 is a variable capacitor.

4. The digital fast charging circuit as claimed in claim 1, wherein the synchronous rectification and anti-backflow circuit comprises a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a diode D3, a transistor Q1, and a transistor Q2.

5. The digital fast charging circuit as claimed in claim 4, wherein the capacitors C5 and C6 are variable capacitors.

6. The digital quick charging circuit as claimed in claim 1, wherein the MCU control circuit is composed of a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R15, a bidirectional diode SD1 and a bidirectional diode SD 2.

7. The digital fast charging circuit as claimed in claim 1, wherein the connection mode of the dc output circuit and the charged device includes any combination of I2C, I2S, SPI, UART, and CAN charging protocols.

8. The digital quick charging circuit as claimed in claim 1, wherein the memory of the MCU control circuit is compatible with any combination of Type-C, DFP, PD2.0/3.0, PPS, QC3.0/2.0, FCP, SC, PMTK +1.1/2.0/Apple 24A, Samsung 2A.