Synchronous rectification type lithium battery charging controller

Abstract

The utility model discloses a synchronous rectification type lithium battery charging controller. An engine can realize three-phase alternating current output / reverse dragging starting; the inspiration integrated circuit can realize three-phase rectification / three-phase inversion; the buck-boost conversion circuit is configured to provide DC buck output / DC boost output; when the engine provides three-phase alternating-current output, the starting integrated circuit is used for converting three-phase alternating-current voltage output of the engine into high-voltage direct-current voltage. The buck-boost conversion circuit is used for reducing the high-voltage direct-current voltage into low-voltage direct-current voltage to be supplied to the starting battery for charging; when the engine is reversely dragged and started, the buck-boost conversion circuit is used for boosting the voltage of the starting battery into high-voltage direct-current voltage and providing the high-voltage direct-current voltage to the starting integrated circuit; the inspiration integrated circuit converts the high-voltage direct current voltage into three-phase alternating current to reversely drag the engine. According to the utility model, the circuit modules are interactively combined together, so that the problems of large AC / DC integrated size, high design cost, device redundancy and the like are solved, and the product integration level is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of digital engines, in particular to a synchronous rectification type lithium battery charging controller. Background Art

[0002] A digital variable frequency motor is a motor controlled using digital and variable frequency technologies, capable of flexibly adjusting the output frequency and voltage. With the rapid development of digital variable frequency engines, there is an increasing demand for efficiency and highly integrated functions. Currently, the three-phase input of digital motor inverters is assembled using semi-controlled rectification followed by DC-AC conversion, with an additional push-button start module. Because each component requires separate design and integration, manufacturing and system costs are high, resulting in a low cost-performance ratio. Furthermore, the dispersed nature of these components and low integration result in a bulky engine design, which does not meet today's demand for efficient and lightweight product designs. Therefore, to address these issues, a synchronous rectification lithium battery charging controller is needed. Utility Model Content

[0003] The present invention addresses the shortcomings of the prior art and aims to provide a highly integrated topology and a corresponding control method to maximize the sharing of power devices. Therefore, a synchronous rectification lithium battery charging controller is proposed.

[0004] A synchronous rectification type lithium battery charging controller, characterized by:

[0005] It includes an engine, an inspiration integrated circuit, a step-up / step-down conversion circuit and a starting battery which are electrically connected in sequence;

[0006] The engine can realize three-phase AC output / reverse start;

[0007] The said integrated circuit can realize three-phase rectification / three-phase inversion;

[0008] The buck-boost conversion circuit is configured to provide a DC buck output / DC boost output;

[0009] When the engine provides a three-phase AC output, the integrated circuit is used to convert the three-phase AC voltage output of the engine into a high-voltage DC voltage;

[0010] The step-up / step-down conversion circuit is used to step down the high-voltage DC voltage into a low-voltage DC voltage for charging the starting battery;

[0011] When the engine is started in reverse, the step-up / step-down conversion circuit is used to step up the voltage of the starting battery into a high-voltage DC voltage and provide it to the inspiration integrated circuit;

[0012] The integrated circuit converts the high-voltage DC voltage into three-phase AC power to reversely drive the engine.

[0013] In order to better realize the present invention, it is possible to further:

[0014] The control unit is used to control the three-phase rectification / three-phase inversion of the inspiration integrated circuit and the DC step-down output / DC boost output of the step-up and step-down conversion circuit.

[0015] Furthermore: a housekeeper board for controlling the engine speed is provided, and the housekeeper board communicates with the engine and the starting battery respectively.

[0016] Furthermore: the starting battery is used as an auxiliary power supply, and the auxiliary power supply is used to supply power to the housekeeper board.

[0017] Furthermore: the inspiration integrated circuit is a three-phase bridge control circuit composed of power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5, and power tube Q6;

[0018] The source of the power tube Q1 is connected to the drain of the power tube Q2, the source of the power tube Q3 is connected to the drain of the power tube Q4, and the source of the power tube Q5 is connected to the drain of the power tube Q6;

[0019] The drain terminals of the power tubes Q1, Q3, and Q5 are all connected to the positive electrode of the first power port, the source terminals of the power tubes Q2, Q4, and Q6 are all connected to the negative electrode of the first power port, and the capacitor C1 is connected in series between the positive electrode of the first power port and the negative electrode of the first power port;

[0020] The U-phase end of the engine is connected to the common end of the power tube Q1 and the power tube Q2, the V-phase end of the engine is connected to the common end of the power tube Q3 and the power tube Q4, and the W-phase end of the engine is connected to the common end of the power tube Q5 and the power tube Q6.

[0021] Furthermore: the buck-boost conversion circuit includes a power tube Q7 and a power tube Q8;

[0022] The source of the power tube Q7 is connected to the drain of the power tube Q8, the power tube Q7 is connected to the positive electrode of the first power port, and the source of the power tube Q8 is connected to the negative electrode of the first power port;

[0023] The first end of the inductor L1 is connected between the power tube Q7 and the power tube Q8, the second end of the inductor L1 is connected to the positive electrode of the starting battery, the negative electrode of the starting battery is connected between the power tube Q9 and the power tube Q10, and the inductor C3 is connected between the second end of the inductor L1 and the source of the power tube Q8;

[0024] The beneficial effects of the utility model are:

[0025] The overall structure has a high composite utilization rate, and adopts an engine, an integrated inspiration circuit, a buck-boost conversion circuit and a starting battery that are electrically connected in sequence. At the same time, the control unit is used to control the three-phase rectification / three-phase inversion of the integrated inspiration circuit, and the DC buck output / DC boost output of the buck-boost conversion circuit. Among them, the integrated inspiration circuit adopts a three-phase bridge control circuit composed of power tubes Q1, Q2, Q3, Q4, Q5 and Q6, which can realize three-phase rectification / three-phase inversion. During reverse starting, capacitor C1, power tube Q7, Q8 and inductor L1 form a boost circuit. When charging is required, capacitor C2, power tube Q7, Q8 and inductor L1 form a buck circuit to supply power to the starting battery. The utility model solves the problems of large AC / DC integrated volume, high design cost and device redundancy by interactively combining various circuit modules, thereby greatly improving product integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the circuit diagram of the utility model;

[0027] Figure 2 This is a schematic diagram of the use of the present utility model. DETAILED DESCRIPTION

[0028] 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.

[0029] like Figure 1 and Figure 2 As shown:

[0030] A synchronous rectification type lithium battery charging controller includes an engine, an inspiration integrated circuit, a buck-boost conversion circuit and a starting battery which are electrically connected in sequence;

[0031] The engine can achieve three-phase AC output / reverse start;

[0032] The said integrated circuit can realize three-phase rectification / three-phase inversion;

[0033] The buck-boost conversion circuit can provide DC buck output / DC boost output;

[0034] When the engine provides three-phase AC output, the integrated circuit converts the three-phase AC voltage output of the engine into a high-voltage DC voltage;

[0035] The step-up / step-down conversion circuit steps down the high-voltage DC voltage into a low-voltage DC voltage to charge the starting battery;

[0036] The control unit is used to control the three-phase rectification / three-phase inversion of the inspiration integrated circuit and the DC buck output / DC boost output of the buck-boost conversion circuit.

[0037] The engine speed control board communicates with the engine and the starting battery. The starting battery provides power to the auxiliary power supply, which in turn provides power to the engine speed control board.

[0038] When the engine is started in reverse, the step-up / step-down conversion circuit boosts the voltage of the starting battery into a high-voltage DC voltage and supplies it to the starting integrated circuit;

[0039] The integrated circuit converts high-voltage DC voltage into three-phase AC power to reversely drive the engine.

[0040] The inspiration integrated circuit is a three-phase bridge control circuit composed of power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5 and power tube Q6;

[0041] The engine has a U-direction end, a V-direction end, and a W-direction end. The source of the power tube Q1 is connected to the drain of the power tube Q2, the source of the power tube Q3 is connected to the drain of the power tube Q4, and the source of the power tube Q5 is connected to the drain of the power tube Q6. The drains of the power tubes Q1, Q3, and Q5 are all connected to the positive electrode of the first power port. The sources of the power tubes Q2, Q4, and Q6 are all connected to the negative electrode of the first power port. A voltage-stabilizing capacitor C1 is connected in series between the positive electrode of the first power port and the negative electrode of the first power port.

[0042] The U-phase end of the engine is connected to the common end of the power tube Q1 and the power tube Q2, the V-phase end of the engine is connected to the common end of the power tube Q3 and the power tube Q4, and the W-phase end of the engine is connected to the common end of the power tube Q5 and the power tube Q6.

[0043] The buck-boost conversion circuit includes a power tube Q7 and a power tube Q8. The source of the power tube Q7 is connected to the drain of the power tube Q8. The drain of the power tube Q7 is connected to the positive electrode of the first power port. The source of the power tube Q8 is connected to the negative electrode of the first power port.

[0044] A first end of the inductor L1 is connected between the power tube Q7 and the power tube Q8, a second end of the inductor L1 is connected to the positive electrode of the starting battery, the negative electrode of the starting battery is connected to the source of the power tube Q8, and an inductor C3 is connected between the second end of the inductor L1 and the source of the power tube Q8.

[0045] The starting battery is a 60V battery, which provides power to all circuits through the auxiliary power circuit M4.

[0046] The power tubes Q1 , Q2 , Q3 , Q4 , Q5 , Q6 , Q7 , Q8 , Q9 , and Q10 are all N-channel MOS tubes.

[0047] The working process of this utility model is as follows:

[0048] Including starting battery reverse engine drag mode and starting battery charging mode;

[0049] The working process of starting the battery reverse engine mode is as follows:

[0050] When the engine is in reverse, the buck-boost converter circuit is configured in boost mode. Capacitor C1, power transistors Q7 and Q8, and inductor L1 form the boost circuit. The control unit controls the buck-boost converter circuit to provide a boosted voltage to the first and second power ports. Specifically, the control unit drives power transistors Q7 and Q8 to provide a boosted voltage to the first power port, increasing the voltage between the first and second power ports to achieve a stable and reliable DC400±20V voltage.

[0051] The inspiration integrated circuit is configured in a three-phase inverter mode. The control unit controls the inspiration integrated circuit to realize three-phase inverter. The control unit drives the power tubes Q1, Q2, Q3, Q4, Q5, and Q6 through the three-phase sensorless BLDC algorithm, so that the inspiration integrated circuit inverts the DC power of the first power port into three-phase power and connects it to the engine, realizing engine reverse starting control.

[0052] The charging mode of the startup battery works as follows:

[0053] When the engine is started, the control unit adjusts the integrated circuit to three-phase rectification mode. Specifically, the control unit drives and controls power tubes Q1, Q2, Q3, Q4, Q5, and Q6 using a three-phase synchronous rectification algorithm to achieve three-phase synchronous rectification, ensuring that the voltage between the first power port and the second power port is 400±20Vdc. At the same time, the control unit uses power tubes Q7 and Q8 for buck control. The housekeeper board communicates with the starting battery via CAN and develops lithium battery charging logic to inform the control unit to implement buck control of power tubes Q7 and Q8, ensuring the output charging voltage is 60V.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0055] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A synchronous rectification type lithium battery charging controller, characterized by: It includes an engine, an inspiration integrated circuit, a step-up / step-down conversion circuit and a starting battery which are electrically connected in sequence; The engine can realize three-phase AC output / reverse start; The said integrated circuit can realize three-phase rectification / three-phase inversion; The buck-boost conversion circuit is configured to provide a DC buck output / DC boost output; When the engine provides a three-phase AC output, the integrated circuit is used to convert the three-phase AC voltage output of the engine into a high-voltage DC voltage; The step-up / step-down conversion circuit is used to step down the high-voltage DC voltage into a low-voltage DC voltage for charging the starting battery; When the engine is started in reverse, the step-up / step-down conversion circuit is used to step up the voltage of the starting battery into a high-voltage DC voltage and provide it to the inspiration integrated circuit; The integrated circuit converts the high-voltage DC voltage into three-phase AC power to reversely drive the engine.

2. The synchronous rectification type lithium battery charging controller according to claim 1, characterized in that: The control unit is used to control the three-phase rectification / three-phase inversion of the inspiration integrated circuit and the DC step-down output / DC boost output of the step-up and step-down conversion circuit.

3. The synchronous rectification type lithium battery charging controller according to claim 2, characterized in that: A housekeeper board for controlling the engine speed is provided, and the housekeeper board communicates with the engine and the starting battery respectively.

4. A synchronous rectification type lithium battery charging controller according to claim 3, characterized in that: The starting battery is used as an auxiliary power supply, and the auxiliary power supply is used to supply power to the housekeeper board.

5. The synchronous rectification type lithium battery charging controller according to claim 4, characterized in that: The inspiration integrated circuit is a three-phase bridge control circuit composed of power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5, and power tube Q6; The source of the power tube Q1 is connected to the drain of the power tube Q2, the source of the power tube Q3 is connected to the drain of the power tube Q4, and the source of the power tube Q5 is connected to the drain of the power tube Q6; The drain terminals of the power tubes Q1, Q3, and Q5 are all connected to the positive electrode of the first power port, the source terminals of the power tubes Q2, Q4, and Q6 are all connected to the negative electrode of the first power port, and a capacitor C1 is connected in series between the positive electrode of the first power port and the negative electrode of the first power port; The U-phase end of the engine is connected to the common end of the power tube Q1 and the power tube Q2, the V-phase end of the engine is connected to the common end of the power tube Q3 and the power tube Q4, and the W-phase end of the engine is connected to the common end of the power tube Q5 and the power tube Q6.

6. The synchronous rectification type lithium battery charging controller according to claim 5, characterized in that: The buck-boost conversion circuit includes a power tube Q7 and a power tube Q8; The source of the power tube Q7 is connected to the drain of the power tube Q8, the power tube Q7 is connected to the positive electrode of the first power port, and the source of the power tube Q8 is connected to the negative electrode of the first power port; A first end of the inductor L1 is connected between the power tube Q7 and the power tube Q8, a second end of the inductor L1 is connected to the positive electrode of the starting battery, and the negative electrode of the starting battery is connected between the power tube Q9 and the power tube Q10. An inductor C3 is connected between the second end of the inductor L1 and the source of the power tube Q8.

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