Battery double-circuit independent output charging device

Abstract

The utility model discloses a battery double-circuit independent output charging device, which comprises a 20-25V direct current voltage input circuit, a direct current step-down circuit, a singlechip control circuit, an A seat metal oxide semiconductor (MOS) driving circuit, an A seat output circuit, a B seat MOS driving circuit and a B seat output circuit, and is characterized in that the 20-25V direct current voltage input circuit is connected with the input end of the direct current step-down circuit; the output end of the DC step-down circuit and the single chip microcomputer control circuit are respectively connected with the A seat MOS drive circuit and the B seat MOS drive circuit, the output end of the A seat MOS drive circuit is connected with the A seat output circuit, the output end of the B seat MOS drive circuit is connected with the B seat output circuit, and the A seat output circuit and the B seat output circuit are respectively used for independently outputting 14.4-17.6 V constant-voltage constant-current direct current. By arranging the A seat MOS driving circuit and the B seat MOS driving circuit, two paths of output voltage can be independently controlled, and the problem that the existing power supply charging equipment cannot independently output is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power charging equipment, in particular to a battery dual-path independent output charging device. Background Art

[0002] Power charging devices generally refer to devices used to charge electronic devices or batteries, including adapters, mobile power supplies, wireless chargers, car chargers, and fast chargers. Most existing power charging devices only have one charging head, and some power charging devices are equipped with two charging heads, but cannot achieve independent output. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery dual-channel independent output charging device, aiming to solve the technical problem that existing power charging equipment cannot output independently.

[0004] To achieve the above objectives, the present invention proposes a battery dual-channel independent output charging device, including a 20-25V DC voltage input circuit, a DC step-down circuit, a single-chip microcomputer control circuit, a seat A MOS drive circuit, a seat A output circuit, a seat B MOS drive circuit and a seat B output circuit. The 20-25V DC voltage input circuit is connected to the input end of the DC step-down circuit, the output end of the DC step-down circuit and the single-chip microcomputer control circuit are respectively connected to the seat A MOS drive circuit and the seat B MOS drive circuit, the output end of the seat A MOS drive circuit is connected to the seat A output circuit, and the output end of the seat B MOS drive circuit is connected to the seat B output circuit. The seat A output circuit and the seat B output circuit are respectively used to independently output 14.4-17.6V constant voltage and constant current DC power.

[0005] In one embodiment of the present invention, the 20-25V DC voltage input circuit includes a 20-25VVIN input terminal and a GND input terminal, and both the 20-25VVIN input terminal and the GND input terminal are connected to the xt60 port to prevent reverse input.

[0006] In one embodiment of the present invention, the 20-25V DC voltage input circuit further includes an overvoltage protection diode and a voltage limiting diode.

[0007] In one embodiment of the present invention, the DC step-down circuit includes a 12V step-down circuit composed of an LM2596S chip and its peripheral components, a 12V to 5V LDO linear voltage regulator circuit composed of an AMS1117-5V chip and its peripheral components, and a 12V to 3.3V LDO linear voltage regulator circuit composed of an AMS1117-3.3V and its peripheral components.

[0008] In one embodiment of the present invention, the single-chip microcomputer control circuit includes a single-chip microcomputer U6, a resistor R38, a resistor R40, a crystal oscillator X1, a capacitor C18, a capacitor C19 and a capacitor C20, the resistor R38 is connected to the BOOT0 pin of the single-chip microcomputer U6, the resistor R40 is connected to the PB2 pin of the single-chip microcomputer U6, the crystal oscillator X1 is connected to the OSC_IN pin and the OSC_OUT pin of the single-chip microcomputer U6, and the capacitor C18, the capacitor C19 and the capacitor C20 are all connected to the VBAT pin of the single-chip microcomputer U6 with a 3.3V voltage.

[0009] In one embodiment of the present invention, the single-chip microcomputer control circuit further includes a temperature detection circuit, a charging circuit state indication circuit, a single-chip microcomputer reset circuit and a heat dissipation circuit.

[0010] In one embodiment of the present invention, the A-block MOS drive circuit includes a drive chip U2, a diode D3, a capacitor C7, a capacitor C8, a capacitor C6, a resistor R10, a resistor R11, a resistor R12, a diode D4, and a diode D5. The diode D3, the capacitor C7, the capacitor C8, the capacitor C6, the resistor R10, the resistor R11, and the resistor R12 are all connected to the drive chip U2, and the diode D4 and the diode D5 are used for overvoltage protection.

[0011] In one embodiment of the present invention, the Block A output circuit includes a Block A filter circuit, a Block A output current detection circuit, a Block A output voltage feedback circuit, and a Block A output interface.

[0012] In one embodiment of the present invention, the B-base MOS drive circuit includes a drive chip U4, a diode D8, a capacitor C14, a capacitor C15, a capacitor C16, a resistor R28, a resistor R29, a resistor R30, a diode D9 and a diode D10. The diode D8, the capacitor C14, the capacitor C15, the capacitor C16, the resistor R28, the resistor R29 and the resistor R30 are all connected to the drive chip U4, and the diode D9 and the diode D10 are used for overvoltage protection.

[0013] In one embodiment of the present invention, the block B output circuit includes a block B filter circuit, a block B output current detection circuit, a block B output voltage feedback circuit, and a block B output interface.

[0014] The utility model proposes a battery dual-channel independent output charging device, which can independently control the two output voltages by setting the A-base MOS driving circuit and the B-base MOS driving circuit, thus solving the problem that the existing power charging equipment cannot have independent output. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 This is a functional block diagram of an embodiment of a battery dual-channel independent output charging device of the present utility model;

[0017] Figure 2 This is the circuit schematic diagram of the 20-25V DC voltage input circuit;

[0018] Figure 3 This is the circuit schematic diagram of the DC step-down circuit;

[0019] Figure 4 This is the circuit schematic diagram of the single chip microcomputer control circuit;

[0020] Figure 5 This is the circuit schematic diagram of the MOS drive circuit of Block A and the output circuit of Block A;

[0021] Figure 6 This is the circuit schematic diagram of the B-base MOS drive circuit and the B-base output circuit.

[0022] In the picture:

[0023] 1-20-25V DC voltage input circuit, 2-DC step-down circuit, 3-MCU control circuit, 4-A-block MOS drive circuit, 5-A-block output circuit, 6-B-block MOS drive circuit, 7-B-block output circuit.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or solutions that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] Figure 1 This is a principle block diagram of an embodiment of a battery dual-channel independent output charging device of the present utility model. Figure 1 As shown, the utility model proposes a battery dual-channel independent output charging device, including a 20-25V DC voltage input circuit 1, a DC step-down circuit 2, a single-chip microcomputer control circuit 3, a seat A MOS drive circuit 4, a seat A output circuit 5, a seat B MOS drive circuit 6 and a seat B output circuit 7. The 20-25V DC voltage input circuit 1 is connected to the input end of the DC step-down circuit 2, the output end of the DC step-down circuit 2 and the single-chip microcomputer control circuit 3 are respectively connected to the seat A MOS drive circuit 4 and the seat B MOS drive circuit 6, the output end of the seat A MOS drive circuit 4 is connected to the seat A output circuit 5, and the output end of the seat B MOS drive circuit 6 is connected to the seat B output circuit 7. The seat A output circuit 5 and the seat B output circuit 7 are respectively used to independently output 14.4-17.6V constant voltage and constant current DC power.

[0030] like Figure 2 As shown, in one embodiment, the 20-25V DC voltage input circuit 1 includes a 20-25V VIN input terminal and a GND input terminal, both of which are connected to the XT60 port to prevent reverse input connection. Optionally, the 20-25V DC voltage input circuit 1 also includes an overvoltage protection diode and a voltage limiting diode.

[0031] After the AC-DC power supply provides a 24V voltage, it is input into the DC-DC dual-port charger core board through the U11 / U12 interface of the circuit board. The anti-reverse connection function is realized through U10. When the connection is reversed, the U10 diode will be turned on, U11 / U12 will be short-circuited, and the AC-DC power supply short-circuit protection mechanism will be triggered, stopping the power supply to the DC-DC dual-port charger core board to achieve reverse connection protection; overvoltage protection is achieved through D12. When the voltage exceeds the parameter limit of D12, the TVS voltage limiting function is triggered to clamp the voltage at 24V; after passing through the C27 / C28 input filter capacitor, a stable and safe 24V voltage is output, completing the input limit framework.

[0032] like Figure 3 As shown, in one embodiment, the DC step-down circuit 2 includes a 12V step-down circuit composed of an LM2596S chip and its peripheral components, a 12V to 5V LDO linear voltage regulator circuit composed of an AMS1117-5V chip and its peripheral components, and a 12V to 3.3V LDO linear voltage regulator circuit composed of an AMS1117-3.3V and its peripheral components.

[0033] The peripheral components of the LM2596S chip U7 include inductor L3, diode D11, capacitor C21 and capacitor C22, which are responsible for powering the cooling fan and the MOS drive circuit.

[0034] The peripheral components of the AMS1117-5V chip U9 include capacitors C23 and C24, and the peripheral components of the AMS1117-3.3V chip U8 include capacitors C25 and C26, which are used to power the microcontroller.

[0035] like Figure 4 As shown, in one embodiment, the single-chip microcomputer control circuit 3 includes a single-chip microcomputer U6, a resistor R38, a resistor R40, a crystal oscillator X1, a capacitor C18, a capacitor C19 and a capacitor C20, the resistor R38 is connected to the BOOT0 pin of the single-chip microcomputer U6, the resistor R40 is connected to the PB2 pin of the single-chip microcomputer U6, the crystal oscillator X1 is connected to the OSC_IN pin and the OSC_OUT pin of the single-chip microcomputer U6, and the capacitors C18, C19 and C20 are all connected to the VBAT pin of the single-chip microcomputer U6 with a 3.3V voltage.

[0036] Microcontroller U6, resistor R38, resistor R40, crystal oscillator X1, capacitor C18, capacitor C19 and capacitor C20 form the minimum operating circuit of the microcontroller. H3 and microcontroller PIN37 / PIN34 pins form the program burning port, and U5 and microcontroller PIN43 / PIN42 pins form the serial port debugging interface.

[0037] Optionally, resistor R41, resistor R42 and capacitor C29 are connected to the input voltage 24V main line and PIN 17 of the microcontroller to form a DC input voltage detection circuit.

[0038] Optionally, the single-chip microcomputer control circuit 3 further includes a temperature detection circuit, a charging circuit state indication circuit, a single-chip microcomputer reset circuit and a heat dissipation circuit.

[0039] Resistor R45, resistor R48, capacitor 32, and MCU pin 16 form the temperature detection circuit for the AC-DC power module. Resistor R43, resistor R46, capacitor C30, and MCU pin 14 form the temperature detection circuit for the Block A charging branch (composed of Block A MOS driver circuit 4 and Block A output circuit 5). Resistor R44, resistor R47, capacitor C31, and MCU pin 15 form the temperature detection circuit for the Block B charging branch (composed of Block B MOS driver circuit 6 and Block B output circuit 7).

[0040] LED1, LED2, resistor R13, resistor R17 and MCU PIN2 constitute the charging status indication circuit of the charging branch of Block A. LED3, LED4, resistor R31, resistor R35 and MCU PIN46 constitute the charging status indication circuit of the charging branch of Block B.

[0041] Terminal H4, resistor R39 and microcontroller PIN38 form the cooling fan interface, which is powered by 12V.

[0042] like Figure 5 As shown, in one embodiment, the A-block MOS drive circuit 4 includes a driver chip U2, a diode D3, a capacitor C7, a capacitor C8, a capacitor C6, a resistor R10, a resistor R11, a resistor R12, a diode D4, and a diode D5. Diode D3, capacitor C7, capacitor C8, capacitor C6, resistor R10, resistor R11, and resistor R12 are all connected to the driver chip U2 and, together with the PIN29 / PIN3 pins of the microcontroller, form a DC-DC push-pull MOS drive circuit for the A charging circuit. Diodes D4 and D5 are used for overvoltage protection to prevent the gate voltage of the field-effect transistor from being too high. Driver chip U2 uses EG2104.

[0043] Optionally, the Block A output circuit 5 includes a Block A filter circuit, a Block A output current detection circuit, a Block A output voltage feedback circuit, and a Block A output interface.

[0044] The output circuit 5 of Block A includes transistors Q1, Q2, diodes D1, D2, resistors R2, R7, R1, and R6. C1 / C2 are the DC-DC filter capacitors for Block A. Chip U1, capacitors C4 and C5, and MCU PIN11 constitute the output current detection circuit for Block A. Resistors R4, R9, capacitor C3, and MCU PIN10 constitute the output voltage feedback circuit for Block A. H1 is the output interface A. Transistors Q5, Q4, resistors R14, R15, and R18, along with MCU PIN30, constitute the output control MOS driver circuit for Port A, which drives the slow-start output switch valve circuit of the DC-DC circuit of Block A, which is composed of transistors Q3, R3, R5, and R8, to the output interface.

[0045] like Figure 6 As shown, in one embodiment, the B-block MOS drive circuit 6 includes a driver chip U4, a diode D8, a capacitor C14, a capacitor C15, a capacitor C16, resistors R28, R29, and R30, a diode D9, and a diode D10. Diode D8, capacitor C14, capacitor C15, capacitor C16, resistors R28, R29, and R30 are all connected to the driver chip U4 and, together with the PIN31 / PIN4 pins of the microcontroller, form a B charging circuit DC-DC push-pull MOS drive circuit. Diodes D9 and D10 are used for overvoltage protection to prevent the gate voltage of the field-effect transistor from being too high. Driver chip U4 uses EG2104.

[0046] Optionally, the Block B output circuit 7 includes a Block B filter circuit, a Block B output current detection circuit, a Block B output voltage feedback circuit, and a Block B output interface.

[0047] The B block output circuit 7 includes transistor Q6, transistor Q8, diode D6, diode D7, resistor R21, resistor R25, resistor R19, and resistor R24. Capacitor C9 and capacitor C10 are DC-DC filter capacitors for B block. Chip U3, capacitor C12, capacitor C13 and PIN13 pin of the microcontroller constitute the output current detection circuit of B block; resistor R22, resistor R27, capacitor C11 and PIN12 pin of the microcontroller constitute the output voltage feedback circuit of B block; H2 is the B output interface; transistor Q9, transistor Q10, resistor R32, resistor R33, resistor R34, resistor R36 and PIN32 pin of the microcontroller constitute the B block output control MOS drive circuit, which is used to drive the B block DC-DC circuit composed of transistor Q7, resistor R23, resistor R26, and resistor R20 to the slow-start output switch valve circuit of the output interface.

[0048] In summary, the utility model adopts the STM32F103C8T6 single-chip microcomputer as the main control, and the ACS712ELCTR-20A-T as the core current acquisition device (this device can provide 12-bit precision current acquisition and can measure currents up to 20A. It adopts the Hall effect measurement method, and the measurement part is isolated from the output part, which can ensure that damage to the sampling chip does not affect the single-chip microcomputer processor). EG2104 is the MOS driver chip of the DC-DC circuit in this circuit, which can charge two batteries at the same time, improve charging efficiency, ensure the safety of the charging process, and avoid problems such as overcharging and short circuit.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery dual-channel independent output charging device, characterized in that: The device comprises a 20-25V DC voltage input circuit, a DC step-down circuit, a single-chip microcomputer control circuit, a MOS drive circuit for Block A, an output circuit for Block A, a MOS drive circuit for Block B, and an output circuit for Block B. The 20-25V DC voltage input circuit is connected to the input end of the DC step-down circuit, the output end of the DC step-down circuit and the single-chip microcomputer control circuit are respectively connected to the MOS drive circuit for Block A and the MOS drive circuit for Block B, the output end of the MOS drive circuit for Block A is connected to the output circuit for Block A, and the output end of the MOS drive circuit for Block B is connected to the output circuit for Block B, and the output circuit for Block A and the output circuit for Block B are respectively used to independently output a constant-voltage and constant-current DC power of 14.4-17.6V.

2. A battery dual-channel independent output charging device according to claim 1, characterized in that: The 20-25V DC voltage input circuit includes a 20-25V VIN input terminal and a GND input terminal, and both the 20-25V VIN input terminal and the GND input terminal are connected to the xt60 port to prevent input reverse connection.

3. A battery dual-channel independent output charging device according to claim 2, characterized in that: The 20-25V DC voltage input circuit also includes an overvoltage protection diode and a voltage limiting diode.

4. A battery dual-channel independent output charging device according to claim 1, characterized in that: The DC step-down circuit includes a 12V step-down circuit composed of an LM2596S chip and its peripheral components, a 12V to 5V LDO linear voltage regulator circuit composed of an AMS1117-5V chip and its peripheral components, and a 12V to 3.3V LDO linear voltage regulator circuit composed of an AMS1117-3.3V and its peripheral components.

5. The battery dual-channel independent output charging device according to claim 1, characterized in that: The single-chip microcomputer control circuit includes a single-chip microcomputer U6, a resistor R38, a resistor R40, a crystal oscillator X1, a capacitor C18, a capacitor C19 and a capacitor C20, the resistor R38 is connected to the BOOT0 pin of the single-chip microcomputer U6, the resistor R40 is connected to the PB2 pin of the single-chip microcomputer U6, the crystal oscillator X1 is connected to the OSC_IN pin and the OSC_OUT pin of the single-chip microcomputer U6, and the capacitors C18, C19 and C20 are all connected to the VBAT pin of the single-chip microcomputer U6 with a 3.3V voltage.

6. A battery dual-channel independent output charging device according to claim 1 or 5, characterized in that: The single chip microcomputer control circuit also includes a temperature detection circuit, a charging circuit state indication circuit, a single chip microcomputer reset circuit and a heat dissipation circuit.

7. A battery dual-channel independent output charging device according to claim 1, characterized in that: The A-block MOS drive circuit includes a drive chip U2, a diode D3, a capacitor C7, a capacitor C8, a capacitor C6, a resistor R10, a resistor R11, a resistor R12, a diode D4, and a diode D5. The diode D3, the capacitor C7, the capacitor C8, the capacitor C6, the resistor R10, the resistor R11, and the resistor R12 are all connected to the drive chip U2. The diode D4 and the diode D5 are used for overvoltage protection.

8. A battery dual-channel independent output charging device according to claim 1 or 7, characterized in that: The block A output circuit includes a block A filter circuit, a block A output current detection circuit, a block A output voltage feedback circuit and a block A output interface.

9. The battery dual-channel independent output charging device according to claim 1, characterized in that: The B-base MOS drive circuit includes a drive chip U4, a diode D8, a capacitor C14, a capacitor C15, a capacitor C16, a resistor R28, a resistor R29, a resistor R30, a diode D9, and a diode D10. The diode D8, the capacitor C14, the capacitor C15, the capacitor C16, the resistor R28, the resistor R29, and the resistor R30 are all connected to the drive chip U4. The diode D9 and the diode D10 are used for overvoltage protection.

10. A battery dual-channel independent output charging device according to claim 1 or 9, characterized in that: The B-block output circuit includes a B-block filter circuit, a B-block output current detection circuit, a B-block output voltage feedback circuit, and a B-block output interface.

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