CN114726059A - Charging identification circuit and device - Google Patents

Abstract

The invention provides a charging identification circuit and a device, wherein the charging identification circuit comprises a first interface circuit, a second interface circuit, a power supply circuit and a control circuit, the charging circuit is provided with a power supply input end, a power supply output end and an enabling input end, and the power supply output end and a post-stage circuit output power supply; the charging circuit is provided with a first input end, a second input end, a first output end and an enabling output end; the first input end is connected with the first interface circuit, the second input end is connected with the second interface circuit, the first output end is connected with the power input end, and the enabling output end is connected with the enabling input end. The beneficial effects are that: the application provides a charging identification circuit and a charging identification device, which can be applied to some portable microphone products or some consumer electronics patch cord products around mobile phones. The convenience of customers is used while filling, multiple use scenes are provided, filling and placing are achieved while simultaneously, the efficiency is high, the control is convenient, and the cost is lower.

Description

Charging identification circuit and device

technical field

The invention relates to the technical field of automatic switching electronic circuits, and more particularly, to a charging identification circuit and device.

Background technique

In the prior art, at present, electronic products using a USB charging interface with a built-in rechargeable battery are increasingly favored by consumers because of their comprehensive functions and easy portability. During the manufacture of a product, it is often necessary to use a USB charging device to charge an electronic device with a built-in rechargeable battery. At present, there are few USB data and charging identification circuits on the market, all of which are a set of data and a set of voltages, which have few application scenarios and are inconvenient to use.

SUMMARY OF THE INVENTION

The present invention provides a charging identification circuit and device in order to overcome the situation that USB charging has few application scenarios and is inconvenient to use in the above-mentioned background art, and cannot well realize green environmental protection.

A charging identification circuit, the first interface circuit, the second interface circuit, the power supply circuit and the control circuit,

The charging circuit is provided with a power input terminal, a power output terminal, and an enabling input terminal, and the power output terminal and the post-stage circuit output power;

The charging circuit is provided with a first input terminal, a second input terminal, a first output terminal, and an enabling output terminal; the first input terminal is connected with the first interface circuit, and the second input terminal is connected with the second input terminal. The interface circuit is connected, the first output terminal is connected to the power input terminal, and the enable output terminal is connected to the enable input terminal.

Optionally, the control circuit includes a main control chip and a switch enabling circuit,

The enabling output terminal is set on the main control chip, and the main control chip is further provided with a first detection terminal, a second detection terminal and a switch terminal, and the first detection terminal is connected with the first interface circuit , the second detection circuit is connected to the second interface circuit;

The switch terminal is connected to the switch enabling circuit, and controls the first output terminal to conduct with the first input terminal or the second input terminal.

Optionally, the switch enabling circuit includes a switch circuit, an enabling circuit,

The first input terminal, the second input terminal and the first output terminal are arranged on the enabling circuit; the switch circuit is connected with the switching terminal and the enabling circuit, and controls the enabling circuit to be turned on.

Optionally, the switch circuit includes a first MOS transistor, the gate of the first MOS transistor is connected to the switch terminal, the drain stage is connected to the enabling circuit, and the power input terminal through the first resistor, and the source stage is grounded.

Optionally, the enabling circuit includes a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a diode. The gate is connected to the switch circuit, the drain is connected to the first interface circuit, and the source is connected to the power input terminal, wherein the drain of the second MOS transistor is the first input terminal;

The drain stage of the third MOS transistor is the second input terminal, the second input terminal is connected to the first resistor, the second resistor, the diode, and the second interface circuit, and the gate of the third MOS transistor is connected to the first resistor, the second resistor, the diode, and the second interface circuit. the switch circuit is connected, and the source stage is connected to the power input end;

The other end of the first resistor is connected to the gate of the fourth MOS transistor, the drain stage of the fourth MOS transistor is connected to the first input end, and the source stage is connected to the power input end and the other end of the diode ;

The other end of the third resistor is connected to the second detection end and the fourth resistor, and the other end of the fourth resistor is grounded.

Optionally, the power supply circuit includes a voltage regulator chip and a fifth MOS tube,

The input end of the voltage regulator chip is the power input end, and the output end of the voltage regulator chip is connected to the source stage of the fifth MOS tube; the gate of the fifth MOS tube is the enable input end, and the drain stage is The output terminal of the power supply outputs power to the subsequent circuit, and the input terminal and the output terminal of the voltage regulator chip are both connected with filter capacitors.

Optionally, the first interface circuit includes a first USB interface, the first USB interface is provided with a first power supply terminal and a detection output terminal, one end of the first power supply terminal is connected to an external power supply, and the first power supply The other end of the end is connected to the first input end; the detection output end is connected to a fifth resistor and a first capacitor, the fifth resistor is connected to the first detection end, and the other end of the first capacitor is grounded.

Optionally, the second interface circuit includes a second USB interface, the second USB interface is provided with a second power supply terminal, one end of the second power supply terminal is connected to an external power supply, and the other end of the second power supply terminal passes through. The sixth resistor is connected to the second input end.

In addition, the present application also provides a device, the device is provided with an integrated circuit board, and the integrated circuit board is printed with the above-mentioned charging identification circuit.

The beneficial effect is that the application provides a charging identification circuit and device, which can be applied to some portable microphone products, or some consumer electronic patch cord products around mobile phones. It is convenient for users to charge and use at the same time, providing a variety of usage scenarios, and at the same time realizing charging and discharging at the same time, high efficiency, convenient control, and lower cost.

Description of drawings

FIG. 1 is a circuit diagram of a main control chip of this circuit according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a switch enabling circuit of the present circuit according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a power supply circuit of this circuit according to an embodiment of the present invention.

4 is a circuit diagram of a first interface circuit and a second interface circuit of the present circuit according to an embodiment of the present invention.

Detailed ways

The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate the present embodiment, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable to the artisan that certain well-known structures and descriptions thereof may be omitted from the drawings. The positional relationships described in the drawings are only for exemplary illustration, and should not be construed as a limitation on the present patent.

The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms “upper”, “lower”, “left” and “right” The orientation or positional relationship indicated by "long" and "short" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, structure and operation in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation on this patent. The specific meanings of the above terms.

Below by specific embodiment, and in conjunction with accompanying drawing, the technical scheme of the present invention is further described in detail:

Example 1,

In the embodiment shown in Figures 1-4, the present application discloses a charging identification circuit, a first interface circuit, a second interface circuit, a power supply circuit, and a control circuit, and the charging circuit is provided with a power supply input terminal VBUSIN and a power supply output terminal. RT_5V, enable input terminal RT_POW, power output terminal RT_5V and the output power of the post-stage circuit; the charging circuit is provided with a first input terminal VBUS2, a second input terminal VBUS1-, a first output terminal, and an enabling output terminal; the first input terminal It is connected to the first interface circuit, the second input terminal is connected to the second interface circuit, the first output terminal is connected to the power input terminal VBUSIN, and the enable output terminal is connected to the enable input terminal RT_POW. In this embodiment, the present application controls the power supply of the first interface circuit and the second interface circuit through the control circuit to supply power to the power supply circuit. In an implementation of this embodiment, the first interface circuit and the second interface circuit may be USB connectors, the first interface circuit is connected to a mobile terminal such as a mobile phone, the second interface circuit is connected to a power source such as a power adapter, and the control circuit It is connected with the first interface circuit and the second interface circuit, and identifies the power supply of the first interface circuit and the second interface circuit, so that the controlled one interface circuit or the second interface circuit supplies power to the power supply circuit. This application provides a charging identification circuit and device, which can be applied to some portable microphone products, or some consumer electronic patch cord products around mobile phones. It is convenient for users to charge and use at the same time, providing a variety of usage scenarios, and at the same time realizing charging and discharging at the same time, high efficiency, convenient control, and lower cost.

Example 2,

In some embodiments, the control circuit includes a main control chip U1 and a switch enabling circuit, the enabling output terminal is set on the main control chip U1, and the main control chip U1 is further provided with a first detection terminal C0CC1, a second detection terminal VBUS_DET, The switch terminal VBUS_EN, the first detection terminal is connected to the first interface circuit, the second detection circuit is connected to the second interface circuit; the switch terminal is connected to the switch enabling circuit, and controls the first output terminal to be connected to the first input terminal or the second input terminal on. In this embodiment, the control circuit of the present application may include an integrated chip, such as a main control chip, and a logic circuit, such as a switch enabling circuit; the main control chip is used to receive a signal from the first interface circuit or the second interface circuit, and control the power supply. The circuit is turned on, and the first conductive circuit or the second conductive circuit is controlled to supply power to the power supply circuit. Among them, the main control chip can be a control chip with a model of LDR6023SS, which can be used to identify the voltage of the first interface circuit and the second interface circuit, and at the same time control the power supply circuit and the switch enabling circuit to be turned on.

Example 3

In some embodiments, the switch enable circuit includes a switch circuit and an enable circuit, the first input terminal, the second input terminal and the first output terminal are arranged on the enable circuit; the switch circuit is connected to the switch terminal and the enable circuit, The control enable circuit is turned on. The switch circuit includes a first MOS transistor Q1, the gate of the first MOS transistor Q1 is connected to the switch terminal, the drain stage enabling circuit is connected, and the source stage is grounded. The enabling circuit includes a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a diode S1. The gate is connected to the switch circuit, the drain is connected to the first interface circuit, and the source is connected to the power input terminal VBUSIN, wherein the drain of the second MOS tube is the first input terminal; the drain of the third MOS tube is the second Input terminal, the second input terminal is connected with the first resistor, the second resistor, the diode and the second interface circuit, the gate of the third MOS tube is connected with the switch circuit, the source stage is connected with the power input terminal VBUSIN; the other end of the first resistor It is connected to the gate of the fourth MOS tube, the drain stage of the fourth MOS tube is connected to the first input terminal, the source stage is connected to the power supply input terminal VBUSIN and the other end of the diode; the other end of the third resistor is connected to the second detection terminal, the fourth The resistor is connected, and the other end of the fourth resistor is grounded. In this embodiment, the signal of the main control chip is received through the first MOS transistor, and the signals of the second MOS transistor and the third MOS transistor are pulled down to turn on or off the second MOS transistor and the third MOS transistor. break. Wherein, the gate of the first MOS transistor is also grounded through a current limiting resistor, so as to include the first MOS transistor. In addition, the first MOS transistor of the present application can be replaced by other switching components such as triodes. The second MOS transistor controls the on or off end of the first input end and the power supply circuit by receiving the signal of the switch circuit, thereby controlling the first power supply circuit to supply power to the subsequent circuit. In addition, in this embodiment, the first interface circuit includes a first USB interface, the first USB interface is provided with a first power supply terminal and a detection output terminal, one end of the first power supply terminal is connected to the external power supply, and the other end of the first power supply terminal is connected to the external power supply. The first input end is connected; the detection output end is connected with the fifth resistor and the first capacitor, the fifth resistor is connected with the first detection end, and the other end of the first capacitor is grounded. The first detection terminal of the main control chip detects the voltage of the first interface circuit, thereby controlling the on-off of the power supply circuit. The second enabling circuit includes a third MOS transistor, a fourth MOS transistor, a second resistor, a third resistor, a fourth resistor, and a diode. The drain stage of the third MOS transistor is the second input terminal, and the second input terminal is connected to the first The resistor, the second resistor, the diode, and the second interface circuit are connected, the gate of the third MOS tube is connected to the switch circuit, and the source stage is connected to the power input terminal VBUSIN; in this embodiment, the third MOS tube of the present application is used to connect The second input terminal and the power input terminal VBUSIN are turned on or off by receiving the signal of the first MOS transistor. The other end of the third resistor is connected to the second detection end and the fourth resistor, and the other end of the fourth resistor is grounded. The second detection terminal detects the power from the first input terminal through the third resistor, and outputs it to the main control chip for identification, thereby controlling the on-off of the switch circuit, and then controls the third MOS transistor to be turned on or off. The other end of the first resistor is connected to the gate of the fourth MOS tube, the drain stage of the fourth MOS tube is connected to the first input end, the source stage is connected to the power supply input end VBUSIN and the other end of the diode; the fourth MOS tube, the second resistor , The diode forms a circuit to prevent the voltage from being connected to the first input terminal.

Example 4,

In some embodiments, the power supply circuit includes a voltage regulator chip U2 and a fifth MOS transistor Q5, the input end of the voltage regulator chip is the power input terminal VBUSIN, and the output end of the voltage regulator chip is connected to the source stage of the fifth MOS transistor; the fifth The gate of the MOS tube is the enable input terminal RT_POW, the drain stage is the power output terminal RT_5V and outputs power to the subsequent circuit, and the input and output terminals of the voltage regulator chip are connected with filter capacitors. In this embodiment, the voltage regulator chip of the present application may be a chip with a model of HT7550, and the power input from the first interface circuit or the second interface circuit is output to the subsequent circuit through the voltage regulator chip and the fifth MOS transistor. The gate of the fifth MOS tube is connected to the main control chip, and the on-off of the circuit is controlled by receiving the signal of the main control chip.

Example 5

In some embodiments, the first interface circuit includes a first USB interface J1, the first USB interface is provided with a first power supply terminal and a detection output terminal, one end of the first power supply terminal is connected to an external power supply, and the other end of the first power supply terminal is connected to the first power supply terminal. An input end is connected; the detection output end is connected with the fifth resistor and the first capacitor, the fifth resistor is connected with the first detection end, and the other end of the first capacitor is grounded. The second interface circuit includes a second USB interface J2, the second USB interface is provided with a second power supply terminal, one end of the second power supply terminal is connected to an external power supply, and the other end of the second power supply terminal is connected to the second input terminal through a sixth resistor. In addition, the second interface circuit is further provided with detection terminals C1CC1 and C1CC2, and the detection terminals C1CC1 and C1CC2 are positive and negative insertion detection pins. In this embodiment, the first interface circuit and the second interface circuit may be USB connectors, the first interface circuit is connected to a mobile terminal such as a mobile phone, the second interface circuit is connected to a power source such as a power adapter, and the control circuit is connected to the first interface circuit , The second interface circuit is connected to identify the power supply of the first interface circuit and the second interface circuit, so that the controlled one interface circuit or the second interface circuit supplies power to the power supply circuit.

Example 6,

In some embodiments, the present application also provides a device, the device is provided with an integrated circuit board, and the integrated circuit board is printed with the above-mentioned charging identification circuit.

In this embodiment, the present application realizes dual-interface charging identification through the charging identification circuit. Wherein, the power output terminal RT_5V is the power supply for the post-stage circuit; the first input terminal is connected to the mobile phone terminal USB through the first interface circuit; the second input terminal is connected through the second interface circuit adapter USB.

The first case (taking power): when the mobile phone is connected, the first input terminal is powered on normally, the fourth MOS tube is turned on, and the parasitic characteristics of the MOS tube; the second MOS tube is not turned on, preventing more correct power consumption or output ; 5V is powered from the mobile phone, and the post-stage circuit starts to work normally;

The second case (charging): when the adapter is connected, the second input terminal is powered on normally, the second MOS tube is turned on, and the second input terminal is powered from the adapter. At this time, the main control chip starts to work normally, and the third resistor is resisted. , The fourth resistor is connected to the second detection terminal of the main control chip by dividing the voltage of the adapter. At this time, the main control chip detects the voltage, so the switch terminal is high voltage, the fifth MOS tube is turned on, and the fourth MOS tube is turned on. Adapter to mobile phone charging is possible. So as to realize the process of charging and taking electricity.

During the charging process, the current may reach more than 2A due to fast charging, resulting in the hot phenomenon of the MOS tube. A third MOS tube and a diode are added. When the power is taken, the third MOS tube is connected to the fourth MOS tube, and the diode and the third MOS tube prevent the current from flowing backward; when charging from the second input terminal, the diode and the second MOS tube are connected. Turn on, the chip works normally, the second detection terminal detects the voltage, the main control chip controls the switch terminal to rise, the fifth MOS tube is turned on, the fourth MOS tube and the third MOS tube are turned on at the same time, and the adapter is charged to the mobile phone. process.

In this circuit, the first resistor and the third resistor are used to limit the current to prevent the breakdown of the gates of the second MOS transistor, the third MOS transistor and the fourth MOS transistor. Backflow.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A charging identification circuit is characterized in that a first interface circuit, a second interface circuit, a power supply circuit and a control circuit,

the charging circuit is provided with a power supply input end, a power supply output end and an enabling input end, and the power supply output end and the rear-stage circuit output power supply;

the charging circuit is provided with a first input end, a second input end, a first output end and an enabling output end; the first input end is connected with the first interface circuit, the second input end is connected with the second interface circuit, the first output end is connected with the power input end, and the enabling output end is connected with the enabling input end.

2. The charging identification circuit of claim 1, wherein the control circuit comprises a main control chip, a switch enable circuit,

the enable output end is arranged on the main control chip, the main control chip is also provided with a first detection end, a second detection end and a switch end, the first detection end is connected with the first interface circuit, and the second detection circuit is connected with the second interface circuit;

the switch end is connected with the switch enabling circuit and controls the first output end to be conducted with the first input end or the second input end.

3. The charging identification circuit of claim 2, wherein the switch enable circuit comprises a switch circuit, an enable circuit,

the first input end, the second input end and the first output end are arranged on the enabling circuit; the switch circuit is connected with the switch end and the enabling circuit to control the enabling circuit to be conducted.

4. A charging identification circuit as claimed in claim 3, characterized in that the switching circuit comprises a first MOS transistor, the gate of the first MOS transistor is connected to the switching terminal, the drain of the first MOS transistor is connected to the enabling circuit and the power input terminal via a first resistor, and the source of the first MOS transistor is grounded.

5. The charging identification circuit of claim 4, wherein the enabling circuit comprises a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a diode, a gate of the second MOS transistor is connected to the switching circuit, a drain of the second MOS transistor is connected to the first interface circuit, a source of the second MOS transistor is connected to the power input, and a drain of the second MOS transistor is the first input;

the drain of the third MOS tube is a second input end, the second input end is connected with the first resistor, the second resistor, the diode and the second interface circuit, the grid of the third MOS tube is connected with the switch circuit, and the source is connected with the power supply input end;

the other end of the first resistor is connected with a grid electrode of the fourth MOS tube, a drain electrode of the fourth MOS tube is connected with the first input end, and a source electrode of the fourth MOS tube is connected with the power supply input end and the other end of the diode;

the other end of the third resistor is connected with the second detection end and the fourth resistor, and the other end of the fourth resistor is grounded.

6. The charging identification circuit of claim 2, wherein the power supply circuit comprises a voltage regulator chip, a fifth MOS transistor,

the input end of the voltage stabilizing chip is a power supply input end, and the output end of the voltage stabilizing chip is connected with the source level of the fifth MOS tube; the grid of the fifth MOS tube is an enabling input end, the drain is a power output end and outputs power to a rear-stage circuit, and the input end and the output end of the voltage stabilizing chip are both connected with a filter capacitor.

7. A charging identification circuit as claimed in claim 2, characterized in that said first interface circuit comprises a first USB interface, said first USB interface is provided with a first power end and a detection output end, and said first power end is connected to an external power source.

8. The charging identification circuit of claim 7, wherein the first USB interface further comprises a detection output terminal, the detection output terminal is connected to a fifth resistor and a first capacitor, the fifth resistor is connected to the first detection terminal, and the other end of the first capacitor is grounded.

9. A charging identification circuit as claimed in claim 1, characterized in that said second interface circuit comprises a second USB interface, said second USB interface is provided with a second power supply end, one end of said second power supply end is connected with an external power supply, and the other end of said second power supply end is connected with said second input end through a sixth resistor.

10. A device, characterized in that it is provided with an integrated circuit board printed with a charging identification circuit according to any of claims 1-9.

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