CN217563359U

CN217563359U - Charging control circuit

Info

Publication number: CN217563359U
Application number: CN202221043233.6U
Authority: CN
Inventors: 卢雪锋; 鄢遍
Original assignee: Shenzhen Aobai Technology Co Ltd
Current assignee: Shenzhen Aobai Technology Co Ltd
Priority date: 2022-05-05
Filing date: 2022-05-05
Publication date: 2022-10-11
Anticipated expiration: 2032-05-05

Abstract

The utility model belongs to the technical field of the mobile lighting, a charge control circuit is related to, include: the mobile lighting device comprises a charger circuit and a mobile lighting device circuit used for being connected with the charger circuit; the charger circuit includes: constant current detection and charge protocol identification circuit and singlechip U6 charge, the mobile lighting equipment circuit includes: the charging system comprises a linear voltage reduction circuit, a charging port short-circuit protection and charging protocol sending circuit and a single chip microcomputer U4. The mobile lighting device has the advantages that short circuit of the charging port of the mobile lighting device can be prevented, and the charger can be compatible with various types of batteries.

Description

Charging control circuit

Technical Field

The utility model belongs to the technical field of the mobile lighting, a charge control circuit is related to.

Background

A common charging protection circuit of a mobile lighting device is shown in fig. 6, and the charging protection circuit is a charging port short-circuit protection circuit, when charging + and charging-short-circuit, a triode Q3 is turned on, so that an MOS transistor Q1 closes and disconnects a current path between a battery anode and charging +; when the charger is externally connected, the MOS tube Q1 is conducted, and the charging + is conducted with the positive electrode of the battery to form a charging loop. However, the circuit cannot communicate with the charger in a protocol, the current for charging the battery is set by the inside of the charger, and the required charging current is different due to different capacities of different types of batteries, so that the existing charger is difficult to be compatible with different types of batteries in different mobile lighting devices.

Disclosure of Invention

An object of the utility model is to provide a charging control circuit to prior art's not enough, can prevent on the one hand that mobile lighting device's the mouth that charges from taking place the short circuit, on the other hand can also make the charger can compatible multiple type battery.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a control circuit, comprising: the mobile lighting device comprises a charger circuit and a mobile lighting device circuit used for being connected with the charger circuit; the charger circuit includes: constant current detection and charge protocol identification circuit and singlechip U6 charge, the mobile lighting equipment circuit includes: the charging system comprises a linear voltage reduction circuit, a charging port short-circuit protection and charging protocol sending circuit and a single chip microcomputer U4.

Further, the charging port short-circuit protection and charging protocol transmission circuit includes: triode Q5, triode Q6, triode Q4, triode Q3 and MOS pipe Q2, triode Q5's projecting pole ground connection, singlechip U4's No. 6 pin EN port is connected to triode Q5's base, triode Q6's base is connected to triode Q5's collecting electrode, network terminal BAT + is connected to triode Q6's projecting pole, triode Q4's collecting electrode is connected to triode Q6's collecting electrode, BAT + is connected to triode Q4's projecting pole, triode Q3's base is connected to triode Q4's base, triode Q3's collecting electrode ground connection, MOS pipe Q2's drain electrode is connected to triode Q3's projecting pole, MOS pipe Q2's grid connection to triode Q6's collecting electrode and triode Q4's collecting electrode looks link, MOS pipe Q2's drain electrode is used for connecting the positive pole that charges.

Further, the charging port short-circuit protection and charging protocol transmission circuit further includes: a voltage division detection circuit, the voltage division detection circuit comprising: the mobile lighting device comprises a resistor R19 and a resistor R20, wherein one end of the resistor R19 is connected with a charging anode of the mobile lighting device, the other end of the resistor R19 is connected with one end of the resistor R20, the other end of the resistor R20 is grounded, and the connection end of the resistor R19 and the resistor R20 is connected to a KEY _ AD port of the singlechip U4.

Further, the charging constant current detection and charging protocol identification circuit includes: the charging constant current detection circuit is connected with a charging anode on the charger, the charging constant current detection circuit is connected with the single chip microcomputer U6, the charging protocol identification circuit is connected between the charging constant current detection circuit and the charging anode on the charger, and the charging protocol identification circuit comprises: resistance R23 and resistance R24, the positive pole that charges on the charger is connected to resistance R23's one end, wherein one end of resistance R24 is connected to resistance R23's the other end, and resistance R24's the other end ground connection, resistance R23 and resistance R24's the link end is connected to No. 16 pin CH _ AD ports of singlechip U6.

Further, the linear voltage-reducing circuit includes: the voltage reduction chip U3 is provided with the model of XC6206.

Further, the model of the single chip microcomputer U4 is SC92F8003.

Further, the model of the single chip microcomputer U6 is SC92F8003.

The utility model has the advantages that:

by combining a charger circuit with a mobile lighting device circuit, the charger circuit comprises: the charging constant current detection and charging protocol identification circuit, the single chip microcomputer U6, the linear voltage reduction circuit, the charging port short-circuit protection and charging protocol sending circuit and the single chip microcomputer U4 can prevent the charging port of the mobile lighting equipment from being short-circuited, improve the safety of the mobile lighting equipment during charging, and enable the charger to be compatible with various batteries to charge the mobile lighting equipment of different types.

Drawings

Fig. 1 is a schematic diagram of a charging port short-circuit protection and charging protocol transmission circuit in the present invention;

FIG. 2 is a schematic diagram of a singlechip U4 in the present invention;

FIG. 3 is a schematic diagram of the middle linear voltage step-down circuit of the present invention;

FIG. 4 is a schematic diagram of a singlechip U6 in the present invention;

fig. 5 is a schematic diagram of a charging constant current detection and charging protocol identification circuit according to the present invention;

fig. 6 is a schematic diagram of a prior art short-circuit protection circuit.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1-5, a control circuit comprising: the mobile lighting device comprises a charger circuit and a mobile lighting device circuit used for being connected with the charger circuit; the charger circuit includes: constant current detection and charge protocol identification circuit and singlechip U6 charge, the mobile lighting equipment circuit includes: the charging system comprises a linear voltage reduction circuit, a charging port short-circuit protection and charging protocol sending circuit and a single chip microcomputer U4; the models of the single chip microcomputer U4 and the single chip microcomputer U6 are SC92F8003.

In one embodiment, the charging port short-circuit protection and charging protocol transmission circuit includes: the charging circuit comprises a triode Q5, a triode Q6, a triode Q4, a triode Q3 and an MOS (metal oxide semiconductor) tube Q2, wherein an emitting electrode of the triode Q5 is grounded, a base electrode of the triode Q5 is connected with an EN (EN) port No. 6 of a singlechip U4, a collecting electrode of the triode Q5 is connected with a base electrode of the triode Q6, an emitting electrode of the triode Q6 is connected with a BAT +, a collecting electrode of the triode Q6 is connected with a collecting electrode of the triode Q4, a connecting end of the collecting electrode of the triode Q6 and a collecting electrode of the triode Q4 is connected with a resistor R22, the other end of the resistor R22 is grounded, the emitting electrode of the triode Q4 is connected with BAT +, the base electrode of the triode Q4 is connected with a base electrode of the triode Q3, the collecting electrode of the triode Q3 is grounded, a resistor R21 is connected between the collecting electrode of the triode Q3 and the grounding end, the emitting electrode of the triode Q3 is connected with a drain electrode of the MOS tube Q2, a grid electrode of the MOS tube Q2 is connected with a collecting electrode of the triode Q6 and a collecting electrode of the triode Q4, and a drain electrode of the MOS tube Q2 is connected with a charging anode; the MOS transistor Q2 is JMTL3401A, the triodes Q3 and Q4 are TK3906, and the triodes Q5 and Q6 are DTA143EE.

In one embodiment, the charging port short-circuit protection and charging protocol transmission circuit further comprises: a voltage division detection circuit, the voltage division detection circuit comprising: the mobile lighting device comprises a resistor R19 and a resistor R20, one end of the resistor R19 is connected with a charging anode of the mobile lighting device, the other end of the resistor R19 is connected with one end of the resistor R20, the other end of the resistor R20 is grounded, the connecting end of the resistor R19 and the resistor R20 is connected to a KEY _ AD port of the single chip U4, a capacitor C14 is further connected between the KEY _ AD port of the single chip U4 and the connecting end of the resistor R19 and the resistor R20, and the other end of the capacitor C14 is grounded.

In one embodiment, the charging constant current detection and charging protocol identification circuit includes: the charging constant current detection circuit is connected with a charging anode on the charger, the charging constant current detection circuit is connected with the single chip microcomputer U6, the charging protocol identification circuit is connected between the charging constant current detection circuit and the charging anode on the charger, and the charging protocol identification circuit comprises: resistance R23 and resistance R24, the positive pole that charges on the charger is connected to resistance R23's one end, wherein one end of resistance R24 is connected to resistance R23's the other end, and resistance R24's the other end ground connection, resistance R23 and resistance R24's the link end is connected to No. 16 pin CH _ AD ports of singlechip U6.

In one embodiment, the linear voltage reduction circuit includes: step-down chip U3, step-down chip U3's model is XC6206, and step-down chip U3's No. 1 link GND ground connection, no. 5 pin VDD ports of singlechip U4 are connected to step-down chip U3's No. 2 links, step-down chip U3's No. 3 link connection network end BAT +, still be connected with electric capacity C13 between step-down chip U3's No. 3 link and No. 1 link, still be connected with electric capacity C12 between step-down chip U3's No. 2 link and No. 1 link.

The working principle is as follows: the BAT + network in the mobile lighting device circuit is used for connecting the positive pole of the battery, and the GND is connected with the negative pole of the battery; the 5V network in the charging constant current detection and charging protocol identification circuit is used for being connected with an output port of a 5V adapter, the charging ports are charging anodes CH + and GND, the mobile lighting equipment circuit is connected with the charger only through two network ports of the charging anodes CH + and GND during charging, and the charging protocol is transmitted and received on the two connecting lines. The 5V and GND network in the charging constant current detection and charging protocol identification circuit is connected with the adapter to obtain a power supply, and at the moment, the single chip microcomputer U6 controls the charging constant current detection circuit to set and output 100mA constant current through the No. 13 pin SCL port and the No. 20 pin SDA port. In the mobile lighting equipment circuit, because the emitter of the triode Q4 in the charging port short-circuit protection and charging protocol sending circuit is connected with the battery BAT +, the base of the triode Q4 is connected with the negative pole GND of the battery through the resistor R21, so that a PN junction between the base of the triode Q4 and the emitter forms a current loop, and the triode Q4 can reach a saturation state (because the resistor R22 is 2M ohm, the R21 is 1M ohm, and the Ib current of the Q4 triode is greater than the Ic current), the grid electrode voltage of the MOS tube Q2 is equal to the voltage of BAT +, and the MOS tube Q2 is in a cut-off state; because the MOS tube Q2 is in a cut-off state, current cannot be formed when CH + is short-circuited to the cathode GND of the battery, and therefore the short-circuit protection effect of a charging port is formed; a linear voltage reduction circuit in the mobile lighting equipment circuit reduces the voltage of the battery and then outputs a stable VDD voltage to supply power to the single chip microcomputer U4. When a charger is connected, the triode Q3 is connected to the resistor R21 in a diode mode in a conducting mode, a PN junction between EBs of the triode Q3 clamps the voltage between a D S pole of the MOS tube Q2 and the resistor R18-the triode Q4 EB, so that the triode Q4 is not conducted, a G pole of the MOS tube Q2 is connected to GND through the resistor R22 and is in a conducting state, the charger current passes through the MOS tube Q2 and the resistor R18 to form a charging loop to a battery BAT +, the voltages of CH + and GND in a circuit of the mobile lighting equipment are battery voltages at the moment, a No. 18 pin KEY _ AD port of the singlechip U4 reads the voltage between the detection resistor R19 and the resistor R20 to judge that the charger is connected, outputs the required charging current through a No. 6 pin EN1 port, and the signal controls the MOS tube Q2 to work through the triode Q5 and the triode Q6; when the PWM signal is low, the MOS tube Q2 is completely conducted, and the voltage of a CH + point is the voltage of the battery; when the PWM signal is high, the MOS tube Q2 is disconnected, but because the body diode of the MOS tube Q2 exists, the charging current still forms a loop through the diode, and the voltage of the CH + point is the voltage of the battery plus the voltage drop of the body diode of the MOS tube Q2; the voltage between a resistor R23 and a resistor R24 is read by a singlechip U6 in the charger circuit through a No. 16 pin CH _ AD port, whether the voltage on CH + is changed from the original voltage to the voltage of an additional body diode is identified, so that a current magnitude signal transmitted by PWM in a host circuit is identified, and the magnitude of the output charging current of the charging constant current detection circuit is set by the singlechip U6 through a No. 13 pin SCL port and a No. 20 pin SDA port.

The above-mentioned embodiments are only one of the preferred embodiments of the present invention, and the general changes and substitutions performed by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A control circuit, comprising: the mobile lighting device comprises a charger circuit and a mobile lighting device circuit used for being connected with the charger circuit; the charger circuit includes: constant current detection and charge protocol identification circuit and singlechip U6 charge, the mobile lighting equipment circuit includes: the charging system comprises a linear voltage reduction circuit, a charging port short-circuit protection and charging protocol sending circuit and a single chip microcomputer U4.

2. The control circuit of claim 1, wherein the charging port short-circuit protection and charging protocol transmission circuit comprises: triode Q5, triode Q6, triode Q4, triode Q3 and MOS pipe Q2, triode Q5's projecting pole ground connection, singlechip U4's No. 6 pin EN port is connected to triode Q5's base, triode Q6's base is connected to triode Q5's collecting electrode, network terminal BAT + is connected to triode Q6's projecting pole, triode Q4's collecting electrode is connected to triode Q6's collecting electrode, triode Q4's projecting pole connection BAT +, triode Q3's base is connected to triode Q4's base, triode Q3's collecting electrode ground connection, MOS pipe Q2's drain electrode is connected to triode Q3's projecting pole, MOS pipe Q2's grid is connected to triode Q6's collecting electrode and triode Q4's collecting electrode looks link, MOS pipe Q2's drain electrode is used for connecting the positive pole that charges.

3. The control circuit of claim 2, wherein the charging port short-circuit protection and charging protocol transmission circuit further comprises: a voltage division detection circuit, the voltage division detection circuit comprising: the mobile lighting device comprises a resistor R19 and a resistor R20, wherein one end of the resistor R19 is connected with a charging anode of the mobile lighting device, the other end of the resistor R19 is connected with one end of the resistor R20, the other end of the resistor R20 is grounded, and the connection end of the resistor R19 and the resistor R20 is connected to a KEY _ AD port of the singlechip U4.

4. The control circuit according to any one of claims 1 to 3, wherein the charging constant current detection and charging protocol identification circuit comprises: the charging constant current detection circuit is connected with a charging anode on the charger, the charging constant current detection circuit is connected with the single chip microcomputer U6, the charging protocol identification circuit is connected between the charging constant current detection circuit and the charging anode on the charger, and the charging protocol identification circuit comprises: resistance R23 and resistance R24, the positive pole that charges on the charger is connected to resistance R23's one end, wherein one end of resistance R24 is connected to resistance R23's the other end, and resistance R24's the other end ground connection, resistance R23 and resistance R24's the link end is connected to 16 number pin CH _ AD ports of singlechip U6.

5. The control circuit of claim 1, wherein the linear voltage reduction circuit comprises: the voltage reduction chip U3 is provided with the model of XC6206.

6. The control circuit according to claim 1, wherein the model of the single chip microcomputer U4 is SC92F8003.

7. The control circuit of claim 1, wherein the model of the single chip microcomputer U6 is SC92F8003.