Intelligent identification circuit and charging circuit

Abstract

The embodiment of the utility model discloses an intelligent identification circuit and a charging circuit, the intelligent identification circuit is applied to the charging circuit, the intelligent identification circuit comprises a BUCK circuit and a comparator circuit, the BUCK circuit is connected with an input power supply and the comparator circuit; the comparator circuit is connected with the input power supply and the BUCK circuit; the comparator circuit is used for comparing a power supply voltage of the input power supply with a reference voltage, and when the power supply voltage is greater than the reference voltage, a high-level signal is sent to the BUCK circuit to trigger the BUCK circuit to be connected; and when the power supply voltage is smaller than the reference voltage, a low-level signal is sent to the BUCK circuit, and the BUCK circuit is triggered to be turned off.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to an intelligent identification circuit and a charging circuit. Background Art

[0002] When the charger is powered off and a mobile phone is plugged in, the phone will have a 5V voltage, which will flow mA-level current back into the charger, causing the phone to consume power in reverse. Utility Model Content

[0003] The embodiments of the present application provide an intelligent identification circuit and a charging circuit.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides an intelligent identification circuit, which is applied to a charging circuit. The intelligent identification circuit includes a BUCK circuit and a comparator circuit, wherein:

[0006] The BUCK circuit is connected to the input power supply and the comparator circuit;

[0007] The comparator circuit is connected to the input power supply and the BUCK circuit;

[0008] The comparator circuit is used to compare the power supply voltage of the input power supply with a reference voltage. When the power supply voltage is greater than the reference voltage, a high-level signal is sent to the buck circuit to trigger the buck circuit to be connected; when the power supply voltage is less than the reference voltage, a low-level signal is sent to the buck circuit to trigger the buck circuit to be turned off.

[0009] In a second aspect, an embodiment of the present application provides a charging circuit, which includes: the intelligent identification circuit provided by any embodiment of the present application.

[0010] Through the intelligent identification circuit provided in the embodiment of the present application, the power supply voltage is compared with the reference voltage through the comparator circuit, and a high-level signal or a low-level signal is sent to the BUCK circuit to trigger the BUCK circuit to be connected or shut down. While ensuring the charging function, it can prevent current from flowing back into the charger when the charger is inserted into the mobile phone, thereby avoiding leakage of the mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of the intelligent identification circuit provided in an embodiment of the present application;

[0012] Figure 2 A schematic diagram of the structure of a comparator circuit provided in an embodiment of the present application;

[0013] Figure 3A schematic diagram of the structure of the protocol IC circuit provided in an embodiment of the present application;

[0014] Figure 4 A schematic diagram of the structure of the BUCK circuit provided in an embodiment of the present application;

[0015] Figure 5 This is a schematic diagram of the working logic of the intelligent identification circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0017] It should be noted that in the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the embodiments of the present application, the character " / " generally indicates that the associated objects are in an "or" relationship.

[0018] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0019] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following relevant technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0020] Figure 1 A schematic diagram of the structure of an intelligent identification circuit provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, an embodiment of the present application provides an intelligent identification circuit, which is applied to a charging circuit. The intelligent identification circuit includes: a BUCK circuit and a comparator circuit, wherein:

[0021] The BUCK circuit is connected to the input power supply and the comparator circuit;

[0022] The comparator circuit is connected to the input power supply and the BUCK circuit;

[0023] The comparator circuit is used to compare the power supply voltage of the input power supply with a reference voltage. When the power supply voltage is greater than the reference voltage, a high-level signal is sent to the buck circuit to trigger the buck circuit to be connected; when the power supply voltage is less than the reference voltage, a low-level signal is sent to the buck circuit to trigger the buck circuit to be turned off.

[0024] In the embodiment of the present application, the reference voltage is related to the load connected to the charging circuit. Exemplarily, the reference voltage can be set to be greater than or equal to the load port voltage.

[0025] In actual applications, the load port voltage of electronic devices such as mobile phones, tablets, watches, and power banks is often around 5V. Therefore, the reference voltage can be set to be greater than or equal to 5V. Preferably, the reference voltage can be set to 7V.

[0026] In an optional implementation manner of the present application, the comparator circuit is connected to the load and is used to detect the load port voltage of the load.

[0027] The comparator circuit is connected to the load and can detect the port voltage of the load. When the load is in a charging state and the charger side is powered off (for example, a power outage occurs during the charging process), the comparator circuit can compare the port voltage on the charger side with the port voltage of the load. When the port voltage on the charger side is lower than the port voltage of the load, a low-level signal is sent to the buck circuit, triggering the buck circuit to shut down and prevent load leakage.

[0028] Based on this, in an optional embodiment of the present application, the comparator circuit is further used to compare the power supply voltage and the load port voltage. When the power supply voltage is less than the load port voltage, a low-level signal is sent to the BUCK circuit to trigger the BUCK circuit to shut down.

[0029] In an embodiment of the present application, the intelligent identification circuit also includes a protocol IC circuit. When the BUCK circuit receives a high-level signal sent by the comparator circuit, the BUCK circuit is turned on and sends a driving power signal to the protocol IC circuit to charge the load; when the BUCK circuit receives a low-level signal sent by the comparator circuit, the BUCK circuit is turned off, stops sending the driving power signal to the protocol IC circuit, stops charging, and prevents the load from leaking.

[0030] Based on this, in an optional embodiment of the present application, the BUCK circuit is connected to the protocol IC circuit; the BUCK circuit is used to respond to the high-level signal and send a driving power signal to the protocol IC circuit; or,

[0031] The BUCK circuit is used to respond to the low-level signal and stop sending the driving power signal to the protocol IC circuit.

[0032] In an optional embodiment of the present application, the protocol IC circuit is connected to the comparator circuit;

[0033] The protocol IC circuit is used to send a voltage signal to the comparator circuit; the voltage signal is used to provide the reference voltage.

[0034] In an optional implementation manner of the present application, the comparator circuit includes: an operational amplifier and a bypass of the operational amplifier.

[0035] In the embodiment of the present application, the operational amplifier and its bypass can constitute a comparator circuit.

[0036] Exemplary, reference Figure 2 , Figure 2 This is a schematic diagram of the structure of the comparator circuit provided in the embodiment of the present application, as shown in FIG. Figure 2 As shown:

[0037] The comparator circuit includes operational amplifier U2 and its bypass circuit. VIN represents the power supply voltage, and AVDD represents the voltage signal input to the protocol IC circuit. This voltage is divided by resistor R69. The first end of R69 is connected to AVDD and the operational amplifier, while the second end is connected to the operational amplifier. This maintains the reference voltage input to operational amplifier U2 at 7V. U2 compares VIN with the reference voltage and sends a high or low signal to the buck circuit via the EN pin.

[0038] Based on this, in an optional implementation manner of the present application, the comparator circuit further includes:

[0039] A voltage-dividing resistor, wherein a first end of the voltage-dividing resistor is connected to the voltage signal and the operational amplifier, and a second end of the voltage-dividing resistor is connected to the operational amplifier.

[0040] In an optional implementation manner of the present application, the protocol IC circuit includes: a protocol IC and a bypass of the protocol IC.

[0041] Exemplary, reference Figure 3 , Figure 3 This is a schematic diagram of the structure of the protocol IC circuit provided in the embodiment of the present application, as shown in FIG. Figure 3 As shown:

[0042] The protocol IC circuit includes the protocol IC U1 and its bypass, which sends a voltage signal to the comparator circuit through AVDD. The PVDD pin of U1 is the MOS drive power pin. When it receives the drive power signal sent by the BUCK circuit, it triggers the charging circuit to supply power to the load. When the drive power signal stops, the charging circuit stops supplying power to the load to prevent load leakage.

[0043] In an optional implementation manner of the present application, the BUCK circuit includes: a DCDC power supply IC and a bypass of the DCDC power supply IC.

[0044] Exemplary, reference Figure 4 , Figure 4 This is a schematic diagram of the structure of the BUCK circuit provided in the embodiment of the present application, as shown in FIG. Figure 4 As shown:

[0045] The BUCK circuit includes the DCDC power supply IC U7 and its bypass. VIN is the input power supply, and the driving power signal is sent to the protocol IC circuit through PVDD.

[0046] refer to Figure 5 , Figure 5 This is a working logic diagram of the intelligent identification circuit provided in the embodiment of the present application, such as Figure 5 As shown, taking the mobile phone charging scenario as an example, since the port voltage on the mobile phone side is often 5V, the reference voltage can be set to 7V. After the charger is plugged into the mobile phone, there are two situations: one is that the charger is connected to the power supply, and the other is that the charger is not connected to the power supply. When the charger is connected to the power supply, the comparator circuit detects the input voltage of the charger and compares the input voltage with 7V. If the input voltage is greater than or equal to 7V, the comparator circuit sends a high-level signal to the buck circuit, triggering the buck circuit to turn on. If the input voltage is less than 7V, the comparator circuit sends a low-level signal to the buck circuit, triggering the buck circuit to turn off. When the charger is not connected to the power supply, including power outages, the comparator circuit detects the port voltage on the charger side and the port voltage on the mobile phone side respectively. When the port voltage on the charger side is less than the port voltage on the mobile phone side, the comparator circuit sends a low-level signal to the buck circuit, triggering the buck circuit to turn off.

[0047] An embodiment of the present application also provides a charging circuit, comprising the intelligent identification circuit provided by any of the aforementioned embodiments of the present application.

[0048] The charging circuit provided in the embodiments of the present application can be applied to devices such as power strips, car chargers, chargers, computers, mobile phones, and tablets.

[0049] The intelligent identification circuit provided in the embodiment of the present application compares the power supply voltage with the reference voltage through a comparator circuit, sends a high-level signal or a low-level signal to the buck circuit, and triggers the buck circuit to be connected or shut down. While ensuring the charging function, it can prevent current from flowing back into the charger when the charger is plugged into the load, thereby avoiding load leakage.

[0050] In the several embodiments provided in this application, it should be understood that the disclosed systems and devices can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0051] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0052] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An intelligent recognition circuit, characterized in that: Applied to the charging circuit, the intelligent identification circuit includes: a BUCK circuit and a comparator circuit, wherein: The BUCK circuit is connected to the input power supply and the comparator circuit; The comparator circuit is connected to the input power supply and the BUCK circuit; The comparator circuit is used to compare the power supply voltage of the input power supply with a reference voltage. When the power supply voltage is greater than the reference voltage, a high-level signal is sent to the buck circuit to trigger the buck circuit to be connected; when the power supply voltage is less than the reference voltage, a low-level signal is sent to the buck circuit to trigger the buck circuit to be turned off.

2. The intelligent identification circuit according to claim 1, characterized in that: The comparator circuit is connected to the load and is used to detect the load port voltage of the load.

3. The intelligent identification circuit according to claim 2, characterized in that: The comparator circuit is further configured to compare the power supply voltage with the load port voltage, and when the power supply voltage is lower than the load port voltage, send a low level signal to the BUCK circuit to trigger the BUCK circuit to shut down.

4. The intelligent identification circuit according to claim 1, further comprising a protocol IC circuit; characterized in that: The BUCK circuit is connected to the protocol IC circuit; The BUCK circuit is used to respond to the high-level signal and send a driving power signal to the protocol IC circuit; or, The BUCK circuit is used to respond to the low-level signal and stop sending the driving power signal to the protocol IC circuit.

5. The intelligent identification circuit according to claim 4, characterized in that: The protocol IC circuit is connected to the comparator circuit; The protocol IC circuit is used to send a voltage signal to the comparator circuit; the voltage signal is used to provide the reference voltage.

6. The intelligent identification circuit according to claim 5, characterized in that: The comparator circuit includes an operational amplifier and a bypass of the operational amplifier.

7. The intelligent identification circuit according to claim 6, characterized in that: The comparator circuit further includes: A voltage-dividing resistor, wherein a first end of the voltage-dividing resistor is connected to the voltage signal and the operational amplifier, and a second end of the voltage-dividing resistor is connected to the operational amplifier.

8. The intelligent identification circuit according to any one of claims 4 to 7, characterized in that: The protocol IC circuit includes: a protocol IC and a bypass of the protocol IC.

9. The intelligent identification circuit according to any one of claims 1 to 7, characterized in that: The BUCK circuit includes a DCDC power supply IC and a bypass of the DCDC power supply IC.

10. A charging circuit, characterized in that: The charging circuit includes: the intelligent identification circuit according to any one of claims 1 to 9.

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