Dual-port USB charging circuit and charger based on same

Abstract

The utility model provides a dual-port USB charging circuit and a charger based on the same. The circuit comprises a charging chip, a power supply circuit used for filtering and stabilizing voltage input by VCC and outputting stable voltage to the charging chip U1 for supplying power, a protection circuit electrically connected to the input end of the power supply circuit, and a voltage regulation circuit used for reducing and filtering voltage passing through the charging chip, the first voltage output circuit is used for filtering and suppressing the voltage output by the charging chip and then outputting the voltage to a USB-A terminal; and the second voltage output circuit is used for filtering and suppressing the voltage output by the charging chip and then outputting the voltage to a USB-C terminal. According to the utility model, peripheral devices are few, the product size is small, and the weight is light; due to the design of the protection circuit, multiple protection functions are added, overvoltage, undervoltage and reverse connection can be effectively prevented, and the power utilization safety of rear-end power utilization equipment is protected; and the method can adapt to most mobile phones in the market.

Description

Technical Field

[0001] The utility model relates to the technical field of chargers, in particular to a dual-port USB charging circuit and a charger based on the circuit. Background Art

[0002] In recent years, smart phones and tablets have developed rapidly. Due to their high power consumption, these devices are generally equipped with large-capacity batteries to provide sufficient battery life, so the requirements for chargers have gradually increased. Especially with the birth of the IPAD, the rated charging current has been increased to 2.1A, and conventional chargers can no longer provide such a large charging current. As a result, many chargers with a rated current greater than 2.1A, or even 3.1A, have emerged. In order to meet the charging requirements of more and more digital devices, dual-port USB chargers have come into being.

[0003] However, currently, the volume of dual-port USB chargers with fast charging functions is usually large, the number of peripheral devices is large, their internal circuits are complex, the power of the overall internal devices is too large, the heat generation increases, and there are no relevant overvoltage, undervoltage, and reverse connection prevention functions, presenting certain potential safety hazards. Summary of the Utility Model

[0004] In order to overcome the defects existing in the above-mentioned prior art, the purpose of the utility model is to provide a dual-port USB charging circuit and a charger based on the circuit.

[0005] In order to achieve the above object of the utility model, the utility model provides a dual-port USB charging circuit, including:

[0006] A charging chip;

[0007] A power supply circuit, used for filtering and regulating the input VCC voltage and outputting a stable voltage to supply power to the charging chip;

[0008] A protection circuit, electrically connected to the input end of the power supply circuit;

[0009] A voltage adjustment circuit, electrically connected between the LX pin and the VOUT pin of the charging chip, for step-down filtering of the voltage passing through the charging chip;

[0010] A first voltage output circuit, used for filtering and suppressing the voltage output by the charging chip and then outputting it to the USB-A terminal;

[0011] A USB-A terminal, electrically connected to the charging chip, and communicating with the charging chip through a communication protocol;

[0012] A second voltage output circuit, used for filtering and suppressing the voltage output by the charging chip and then outputting it to the USB-C terminal;

[0013] The USB-C terminal is electrically connected to the charging chip and communicates with the charging chip through a communication protocol.

[0014] Optionally, the power supply circuit includes an electrolytic capacitor, a first capacitor, a second capacitor, and a first transient suppression diode;

[0015] The electrolytic capacitor, the first capacitor, the second capacitor, and the first transient suppression diode are sequentially connected in parallel with each other to form a filter voltage stabilization circuit. The electrical signal input end of the filter voltage stabilization circuit inputs VCC, the electrical signal output end of the filter voltage stabilization circuit is connected to the power supply end of the charging chip, and the negative electrode of the electrolytic capacitor, one end of the first capacitor, one end of the second capacitor, and the positive electrode of the first transient suppression diode are grounded.

[0016] Optionally, the voltage adjustment circuit includes a first inductor; a first resistor and a fifth capacitor connected in series; and a sixth capacitor, a seventh capacitor, and an eighth capacitor connected in parallel with each other;

[0017] The voltage output from the LX pin of the charging chip is output to the first inductor and simultaneously output to the first resistor and the fifth capacitor. The voltage flowing through the first inductor is filtered by the sixth capacitor, the seventh capacitor, and the eighth capacitor and then reaches the VOUT pin of the charging chip.

[0018] Optionally, the first voltage output circuit includes a ninth capacitor, a tenth capacitor, and a third transient suppression diode,

[0019] The first voltage output end of the charging chip is connected to one end of the ninth capacitor, one end of the tenth capacitor, and the negative electrode of the third transient suppression diode. One end of the ninth capacitor, one end of the tenth capacitor, and the positive electrode of the third transient suppression diode are grounded;

[0020] The voltage output by the charging chip is filtered by the ninth capacitor and the tenth capacitor for the second voltage and then input to the USB-A terminal through the third transient suppression diode.

[0021] Optionally, the second voltage output circuit includes a third capacitor, a fourth capacitor, and a second transient suppression diode;

[0022] The second voltage output end of the charging chip is connected to one end of the third capacitor, one end of the fourth capacitor, and the negative electrode of the second transient suppression diode. The other end of the third capacitor, the other end of the fourth capacitor, and the positive electrode of the second transient suppression diode are grounded;

[0023] The voltage output by the charging chip is filtered by the third capacitor and the fourth capacitor and then input to the VBUS pin of the USB-C terminal through the second transient suppression diode.

[0024] Optionally, the protection circuit includes an insurance module, a second resistor, a first zener diode, a third resistor, a second zener diode, a fourth resistor, a third zener diode, a first MOS transistor, a second MOS transistor, and a triode. The reverse breakdown voltages of the first zener diode and the third zener diode are the same and less than the VCC input voltage, and the reverse breakdown voltage of the second zener diode is higher than the VCC input voltage.

[0025] The input end of the insurance module inputs the VCC voltage, and its output end is connected to one end of the second resistor and one end of the third resistor. The other end of the second resistor is connected to the negative electrode of the first zener diode, and the positive electrode of the first zener diode is connected to one end of the fourth resistor, the negative electrode of the third zener diode, the collector of the triode, the gate of the first MOS transistor, and the gate of the second MOS transistor. The source electrodes of the first MOS transistor, the second MOS transistor, the other end of the fourth resistor, and the positive electrode of the third zener diode are connected; the drain electrodes of the first MOS transistor and the second MOS transistor are grounded.

[0026] The other end of the third resistor is connected to the negative electrode of the second zener diode, the positive electrode of the second zener diode is connected to the base of the triode and one end of the fifth resistor, the emitter of the triode is connected to the positive electrode of the fifth diode, and the negative electrode of the fifth diode and the other end of the fifth resistor are grounded.

[0027] The present application also provides a charger, which includes the above dual-port USB charging circuit.

[0028] The beneficial effects of the present utility model are as follows:

[0029] 1. The dual-port USB charging circuit has few peripheral components, and has the characteristics of small product volume and light weight.

[0030] 2. The design of the protection circuit adds multiple protection functions, which can effectively prevent overvoltage, undervoltage, and reverse connection, and protects the electrical safety of the rear-end electrical equipment.

[0031] 3. The USB-A terminal and the USB-C terminal communicate with the charging chip through a communication protocol, and can adapt to most mobile phones on the market.

[0032] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0033] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0034] Figure 1It is a schematic diagram of the connection between the first voltage output circuit and the second voltage output circuit and the charging chip;

[0035] Figure 2 It is a schematic diagram of the power supply circuit;

[0036] Figure 3 It is a schematic diagram of the protection circuit;

[0037] Figure 4 It is a schematic diagram of the voltage adjustment circuit. Detailed implementation mode

[0038] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0039] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0040] As Figures 1 to 4 shown, the present invention provides an embodiment of a dual-port USB charging circuit. The dual-port USB charging circuit in this embodiment includes: a charging chip U1, a power supply circuit for filtering and regulating the voltage input by VCC and outputting a stable voltage to supply power to the charging chip U1, a protection circuit electrically connected to the input end of the power supply circuit, a voltage adjustment circuit electrically connected between the LX pin and the VOUT pin of the charging chip U1 to step down and filter the voltage passing through the charging chip, a first voltage output circuit for filtering and suppressing the voltage output by the charging chip U1 and then outputting it to the USB-A terminal, and a second voltage output circuit for filtering and suppressing the voltage output by the charging chip and then outputting it to the USB-C terminal; wherein, the USB-A terminal and the USB-C terminal are respectively electrically connected to the charging chip and communicate with the charging chip through a communication protocol.

[0041] As Figure 2 shown, the power supply circuit includes an electrolytic capacitor C11, a first capacitor C1, a second capacitor C2, and a first transient suppression diode DR1;

[0042] The electrolytic capacitor C11, the first capacitor C1, the second capacitor C2, and the first transient suppression diode DR1 are connected in parallel with each other in sequence to form a filtering and voltage stabilizing circuit. The electrical signal input end of the filtering and voltage stabilizing circuit inputs VCC, and the electrical signal output end of the filtering and voltage stabilizing circuit is connected to the power supply end of the charging chip U1. The negative electrode of the electrolytic capacitor C11, one end of the first capacitor C1, one end of the second capacitor C2, and the positive electrode of the first transient suppression diode DR1 are connected to PGND.

[0043] As Figure 3 shown, the protection circuit includes an insurance module F1, a second resistor R2, a first zener diode D1, a third resistor R3, a second zener diode D2, a fourth resistor R4, a third zener diode D3, a first MOS transistor Q1, a second MOS transistor Q2, and a triode Q3. Among them, the reverse breakdown voltages of the first zener diode D1 and the third zener diode D3 are the same and less than the input voltage of VCC, and the reverse breakdown voltage of the second zener diode D2 is higher than the input voltage of VCC.

[0044] The insurance module inputs the VCC voltage at its input end, and its output end is connected to one end of the second resistor R2 and one end of the third resistor R3. The other end of the second resistor R2 is connected to the negative electrode of the first zener diode D1, and the positive electrode of the first zener diode D1 is connected to one end of the fourth resistor R4, the negative electrode of the third zener diode D3, the collector of the triode Q3, the gate of the first MOS transistor Q1, and the gate of the second MOS transistor Q2. The source of the first MOS transistor Q1, the source of the second MOS transistor Q2, the other end of the fourth resistor R1, and the positive electrode of the third zener diode D1 are connected; the drain of the first MOS transistor Q1 is connected to SGND, and the drain of the second MOS transistor Q2 is connected to PGND; the other end of the third resistor R3 is connected to the negative electrode of the second zener diode D2, and the positive electrode of the second zener diode D2 is connected to the base of the triode Q3 and one end of the fifth resistor R5. The emitter of the triode Q3 is connected to the positive electrode of the fifth diode D5, and the negative electrode of the fifth diode D5 and the other end of the fifth resistor R5 are connected to PGND.

[0045] In this embodiment, the VCC inputs a 12V DC voltage. The reverse breakdown voltages of the first voltage-regulating diode D1 and the third voltage-regulating diode D3 are 6.8V, and the reverse breakdown voltage of the second voltage-regulating diode D2 is 22V. When the VCC inputs a normal voltage of 12V, after passing through the fuse module F1, one path of the 12V voltage leads to the electrical signal input end of the filter voltage-regulating circuit of the power supply circuit. After being filtered by the electrolytic capacitor C11, the first capacitor C1, the second capacitor C2, and the first transient suppression diode DR1 and preventing surges, it reaches the chip power supply end; the other path of the 12V voltage passes through the second resistor R2 of the protection circuit. The 12V voltage passing through the second resistor R2 then reaches the first voltage-regulating diode D1. At this time, the second voltage-regulating diode D2 conducts, and after passing through the fourth resistor R4 and the third voltage-regulating diode D3, it reaches the gates of the first MOS transistor Q1 and the second MOS transistor Q2, enabling the two first MOS transistors Q1 and the second MOS transistor Q2 to work. The first MOS transistor Q1 and the second MOS transistor Q2 conduct at this time, connecting SGND and PGND; at the same time, the 12V voltage passes through the third resistor R3 and then reaches the second voltage-regulating diode D2. At this time, the second voltage-regulating diode D2 does not work, and the voltage cannot reach the subsequent circuit. The voltage and current do not reach the triode Q3, the fifth resistor R5, and the fifth diode D5. This protection circuit can effectively prevent overvoltage, undervoltage, and reverse connection.

[0046] The voltage passing through the charging chip U1 needs to be output through its LX pin and stepped down and filtered by the voltage adjustment circuit. As Figure 4 shown, the voltage adjustment circuit includes a first inductor L1; a series-connected first resistor R1 and fifth capacitor C5; and a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8 connected in parallel with each other. The voltage passing through the charging chip U1 reaches the first inductor L1 through the LX pin of the charging chip U1. At the same time, the voltage flows through the first resistor R1 and the fifth capacitor C5. Here, the first resistor R1 and the fifth capacitor C5 together form an absorption of the voltage spike at the LX pin of the charging chip U1. The voltage flowing through the first inductor L1 is filtered by the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8 and then reaches the VOUT pin of the charging chip U1. Then, as Figure 1 shown, the voltage output through the first voltage output terminal VOUT1 (pins 24 and 25) of the charging chip is output to the first voltage output circuit, and at the same time, it is also output to the second voltage output circuit through the second voltage output terminal VOUT2 (pins 26 and 27) of the charging chip.

[0047] As Figure 1As shown in the figure, the first voltage output circuit includes the ninth capacitor C9, the tenth capacitor C10, and the third transient suppression diode DR3. The first voltage output terminal VOUT1 of the charging chip U1 is connected to one end of the ninth capacitor C9, one end of the tenth capacitor C10, and the negative electrode of the third transient suppression diode DR3. One end of the ninth capacitor C9, one end of the tenth capacitor C10, and the positive electrode of the third transient suppression diode DR3 are grounded. The voltage output by the charging chip U1 is filtered by the ninth capacitor C9 and the tenth capacitor C10, and then input to pin 1 (VOUT1 pin) of the USB-A terminal through the third transient suppression diode DR3. Among them, pin 2 of the USB-A terminal is connected to the DM1 pin of the charging chip U1, pin 3 of the USB-A terminal is connected to the DP1 pin of the charging chip U1, and pin 4 of the USB-A terminal is connected to PGND. Except for the power supply pin and the ground, the other pins of the USB-A terminal are signal pins, which communicate with the charging chip for relevant fast charging protocols.

[0048] As Figure 1 shown in the figure, the second voltage output circuit includes the third capacitor C3, the fourth capacitor C4, and the second transient suppression diode DR2. The second voltage output terminal VOUT2 of the charging chip U1 is connected to one end of the third capacitor C3, one end of the fourth capacitor C4, and the negative electrode of the second transient suppression diode DR2. The other end of the third capacitor C3, the other end of the fourth capacitor C4, and the positive electrode of the second transient suppression diode DR2 are connected to PGND; the voltage output by the charging chip U1 is filtered by the third capacitor C3 and the fourth capacitor C4, and then input to the VBUS pin of the USB-C terminal through the second transient suppression diode DR2. The CC1 pin of the USB-C terminal is connected to the CCB1 pin of the charging chip U1, the DP1 pin and DP2 pin of the USB-C terminal are connected to the DP2 pin of the charging chip U1, the DN1 pin and DN2 pin of the USB-C terminal are connected to the DM2 pin of the charging chip U1, and the CC2 pin of the USB-C terminal is connected to the CCB2 pin of the charging chip U1. Except for the power supply pin and the ground, the other pins of the USB-C terminal are signal pins, which communicate with the charging chip for relevant fast charging protocols.

[0049] When the USB-A terminal and the USB-C terminal charge external devices (such as mobile phones, tablets, etc.), through the communication protocol, the charging chip provides the corresponding charging current to the external device.

[0050] This application also provides a charger, which includes the above dual-port USB charging circuit.

[0051] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A dual-port USB charging circuit, characterized in that Including: A charging chip; A power supply circuit for filtering and regulating the input VCC voltage and outputting a stable voltage to supply power to the charging chip; A protection circuit electrically connected to the input end of the power supply circuit; A voltage adjustment circuit electrically connected between the LX pin and the VOUT pin of the charging chip to step down and filter the voltage passing through the charging chip; A first voltage output circuit for filtering and suppressing the voltage output by the charging chip and then outputting it to the USB-A terminal; A USB-A terminal electrically connected to the charging chip and communicating with the charging chip through a communication protocol; A second voltage output circuit for filtering and suppressing the voltage output by the charging chip and then outputting it to the USB-C terminal; A USB-C terminal electrically connected to the charging chip and communicating with the charging chip through a communication protocol.

2. The dual-port USB charging circuit according to claim 1, wherein The power supply circuit includes an electrolytic capacitor, a first capacitor, a second capacitor, and a first transient suppression diode; The electrolytic capacitor, the first capacitor, the second capacitor, and the first transient suppression diode are sequentially connected in parallel to form a filtering and voltage regulating circuit. The electrical signal input end of the filtering and voltage regulating circuit inputs VCC, the electrical signal output end of the filtering and voltage regulating circuit is connected to the power supply end of the charging chip, and the negative electrode of the electrolytic capacitor, one end of the first capacitor, one end of the second capacitor, and the positive electrode of the first transient suppression diode are grounded.

3. The dual-port USB charging circuit according to claim 1, characterized in that, The voltage adjustment circuit includes a first inductor; a first resistor and a fifth capacitor connected in series; and a sixth capacitor, a seventh capacitor, and an eighth capacitor connected in parallel with each other; The voltage output from the LX pin of the charging chip is output to the first inductor and simultaneously output to the first resistor and the fifth capacitor. The voltage flowing through the first inductor is filtered by the sixth capacitor, the seventh capacitor, and the eighth capacitor and then reaches the VOUT pin of the charging chip.

4. The dual-port USB charging circuit according to claim 1, wherein The first voltage output circuit includes a ninth capacitor, a tenth capacitor, and a third transient suppression diode, The first voltage output end of the charging chip is connected to one end of the ninth capacitor, one end of the tenth capacitor, and the negative electrode of the third transient suppression diode. One end of the ninth capacitor, one end of the tenth capacitor, and the positive electrode of the third transient suppression diode are grounded; The voltage output by the charging chip is filtered by the ninth capacitor and the tenth capacitor for the second voltage and then input to the USB-A terminal through the third transient suppression diode.

5. The dual-port USB charging circuit according to claim 1, characterized in that The second voltage output circuit includes a third capacitor, a fourth capacitor, and a second transient suppression diode; The second voltage output end of the charging chip is connected to one end of the third capacitor, one end of the fourth capacitor, and the negative electrode of the second transient suppression diode. The other end of the third capacitor, the other end of the fourth capacitor, and the positive electrode of the second transient suppression diode are grounded; The voltage output by the charging chip is filtered by the third capacitor and the fourth capacitor and then input to the VBUS pin of the USB-C terminal through the second transient suppression diode.

6. The dual-port USB charging circuit according to claim 1, wherein The protection circuit includes an insurance module, a second resistor, a first zener diode, a third resistor, a second zener diode, a fourth resistor, a third zener diode, a first MOS transistor, a second MOS transistor, and a triode. Among them, the reverse breakdown voltages of the first zener diode and the third zener diode are the same and less than the VCC input voltage, and the reverse breakdown voltage of the second zener diode is higher than the VCC input voltage; The input end of the insurance module inputs the VCC voltage, and its output end is connected to one end of the second resistor and one end of the third resistor. The other end of the second resistor is connected to the negative electrode of the first zener diode. The positive electrode of the first zener diode is connected to one end of the fourth resistor, the negative electrode of the third zener diode, the collector of the triode, the gate of the first MOS transistor, and the gate of the second MOS transistor. The source electrodes of the first MOS transistor, the second MOS transistor, the other end of the fourth resistor, and the positive electrode of the third zener diode are connected; the drain electrodes of the first MOS transistor and the second MOS transistor are grounded; The other end of the third resistor is connected to the negative electrode of the second zener diode. The positive electrode of the second zener diode is connected to the base of the triode and one end of the fifth resistor. The emitter of the triode is connected to the positive electrode of the fifth diode, and the negative electrode of the fifth diode and the other end of the fifth resistor are grounded.

7. A charger, characterized in that, It includes the dual-port USB charging circuit according to any one of claims 1-6.

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