Low-voltage redundant power supply device and motor controller low-voltage redundant power supply system

Abstract

The utility model discloses a low-voltage redundant power supply device and a motor controller low-voltage redundant power supply system. The low-voltage redundant power supply device comprises a power supply circuit, a discharge circuit and a standby power supply circuit, wherein the power supply circuit and the discharge circuit are connected in parallel between a power utilization unit and the standby power supply circuit; the power supply unit charges the standby power supply circuit through the power supply circuit; when the power supply unit is abnormal, the standby power supply circuit supplies power to the power utilization unit through the discharging circuit. According to the exemplary embodiment, the problem of redundant power supply of the motor controller under the condition that low-voltage power supply fails or power supply fluctuates is solved.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a low-voltage redundant power supply device and a low-voltage redundant power supply system for a motor controller. Background Technology

[0002] Electric vehicles have become the main direction of current automotive development. As the core of the electric drive system of an electric vehicle, the motor controller is typically supplied with a stable low-voltage power supply from the vehicle's low-voltage battery, powering its control and drive circuits and controlling the motor's efficiency and stability. Instability or failure of the low-voltage power supply can cause the motor controller to malfunction, thereby affecting the reliable operation of the entire electric drive system and the vehicle as a whole.

[0003] In related technologies, high-voltage DC / DC converters are typically used to convert the high-voltage electricity of the motor controller bus capacitor into low-voltage electricity as a backup power source for the low-voltage power supply of the motor controller. However, this method has disadvantages such as complex circuitry, low conversion efficiency, low reliability, large electromagnetic interference, and high cost.

[0004] It should be noted that the statements herein provide only background information relevant to this application and do not necessarily constitute prior art. Utility Model Content

[0005] In view of the above problems, this application proposes a low-voltage redundant power supply device and a low-voltage redundant power supply system for motor controllers that overcomes or at least partially solves the above problems.

[0006] The embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a low-voltage redundant power supply device, which includes: a power supply circuit, a discharge circuit, and a backup power supply circuit. The power supply circuit and the discharge circuit are connected in parallel between the power-consuming unit and the backup power supply circuit. The power supply unit charges the backup power supply circuit through the power supply circuit. When the power supply unit is abnormal, the backup power supply circuit provides power to the power-consuming unit through the discharge circuit.

[0008] Preferably, the backup power circuit includes multiple supercapacitor components connected in series.

[0009] Preferably, the supercapacitor assembly includes a supercapacitor and a voltage equalizing resistor, wherein the supercapacitor and the voltage equalizing resistor are connected in parallel.

[0010] Preferably, the power supply circuit includes at least one current-limiting resistor, and when there are multiple current-limiting resistors, the multiple current-limiting resistors are connected in series.

[0011] Preferably, the discharge circuit includes a unidirectional conducting component to prevent reverse connection. Each supercapacitor has the same capacitance value, and each voltage-equalizing resistor has the same resistance value. The current-limiting resistor includes a surface-mount resistor, and when there are multiple surface-mount resistors, each surface-mount resistor has the same resistance value. The unidirectional conducting component includes a diode.

[0012] Secondly, embodiments of this application also provide a low-voltage redundant power supply system for a motor controller, including the low-voltage redundant power supply device as described in any of the first aspects.

[0013] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0014] This disclosure uses a backup power supply circuit to replace the complex high-voltage to low-voltage backup power supply, which simplifies circuit design, improves system reliability, and reduces EMC interference.

[0015] The above description of the technical solution of this application is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the low-voltage redundant power supply device in the embodiments of this application;

[0018] Figure 2 This is a circuit diagram of the low-voltage redundant power supply device in the embodiments of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The technical terms used in this application are as follows:

[0021] EMC (Electromagnetic Compatibility)

[0022] The concept of this application is to design a universally applicable low-voltage redundant power supply device, which addresses the current situation of complex circuits and high electromagnetic interference in redundant power supply devices in related technologies. This device uses a backup power supply circuit to replace the complex high-voltage to low-voltage backup power supply, and simultaneously sets up a power supply circuit and a discharge circuit, thereby improving the reliability of the system and reducing EMC interference.

[0023] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, this application embodiment provides a low-voltage redundant power supply device 100, which includes a power supply circuit 110, a discharge circuit 120, and a backup power supply circuit 130. The power supply circuit 110 and the discharge circuit 120 are connected in parallel between the power consumption unit 150 and the backup power supply circuit 130. The power supply unit 140 charges the backup power supply circuit 130 through the power supply circuit 110. When the power supply unit 140 is abnormal, the backup power supply circuit 130 provides power to the power consumption unit 150 through the discharge circuit 120.

[0025] like Figure 2 The circuit diagram of the low-voltage redundant power supply device shown includes a backup power supply circuit 130 comprising multiple supercapacitor components, such as... Figure 2 The multiple supercapacitor assemblies shown (C1, R6), (C2, R7), (C3, R8), (C4, R9), (C5, R10), (C6, R11), and (C7, R12) are connected in series. The supercapacitor assembly includes a supercapacitor, such as... Figure 2 One of C1, C2, C3, C4, C5, C6, and C7 shown; and the voltage equalizing resistor, such as Figure 2 One of R6, R8, R9, R10, R11 and R12 shown, the supercapacitor and the voltage equalizing resistor are connected in parallel to form a supercapacitor assembly.

[0026] In one example, each of the supercapacitors has the same capacitance value, and each of the voltage-equalizing resistors has the same resistance value. In one example, the supercapacitor has a capacitance value of 3V / 20F, and the voltage-equalizing resistor has a resistance value of 10KΩ. One end of the backup power supply circuit is connected to both the power supply circuit and the charging circuit, and the other end is grounded.

[0027] In some embodiments, the power supply circuit 110 includes at least one current-limiting resistor, i.e. Figure 2One of R1, R2, R3, R4 and R5, and when there are multiple current-limiting resistors, the multiple current-limiting resistors are connected in series.

[0028] Current-limiting resistors include surface-mount resistors. For example... Figure 2 As shown in the example, R1-R5 are all surface-mount resistors with the same resistance value, used to limit the supply current during power supply. This is understandable. Figure 2 The multiple surface-mount resistors can be replaced by a single resistor of a different type with a larger resistance value, as long as it serves to limit the current. In one example, the surface-mount resistor has a resistance value of 5.1Ω.

[0029] In some embodiments, the discharge circuit 120 includes a unidirectional conducting component that prevents reverse connection. The unidirectional conducting component includes a diode.

[0030] like Figure 2 As shown, D2 is a (high-power) diode. The power output from the backup power supply circuit is transmitted to the motor controller control system through diode D2. Terminals 1 and 2 of D2 are connected to the power input terminal, and terminal 2 is connected to the output terminal.

[0031] Under normal circumstances, the motor controller control system is powered by a 12V low-voltage battery, which simultaneously charges the supercapacitor through current-limiting resistors R1-R5. Since supercapacitors typically have low voltage ratings, multiple supercapacitors are needed in series to meet the system's voltage requirements. When the 12V low-voltage battery supply is abnormal or lost, the supercapacitor provides redundant power to the motor controller control system through diode D2. This low-voltage redundant power supply eliminates the need for complex high-to-low voltage backup power supplies, simplifying circuit design and reducing EMC interference.

[0032] This disclosure also provides a low-voltage redundant power supply system for a motor controller, including the low-voltage redundant power supply device described above. The low-voltage redundant power supply system for the motor controller further includes a low-voltage battery, which serves as the main power supply and is connected to the motor controller control system via diode D1. For other parts of the low-voltage redundant power supply system for the motor controller, please refer to the prior art; details will not be repeated here.

[0033] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A low-voltage redundant power supply device, characterized in that, The low-voltage redundant power supply device includes: a power supply circuit, a discharge circuit, and a backup power supply circuit, wherein the power supply circuit and the discharge circuit are connected in parallel between the power consumption unit and the backup power supply circuit. The power supply unit charges the backup power supply circuit through the power supply circuit; When the power supply unit malfunctions, the backup power supply circuit provides power to the power-consuming unit through the discharge circuit; The backup power circuit includes multiple supercapacitor components connected in series. Each supercapacitor component includes a supercapacitor and a voltage-equalizing resistor, with the supercapacitor and the voltage-equalizing resistor connected in parallel. Under normal circumstances, the motor controller control system is powered by a 12V low-voltage battery, which simultaneously charges the supercapacitor through current-limiting resistors R1-R5. When the 12V low-voltage battery power supply is abnormal or lost, the supercapacitor provides redundant power to the motor controller control system through diode D2.

2. The low-voltage redundant power supply device as described in claim 1, characterized in that, The power supply circuit includes at least one current-limiting resistor, and when there are multiple current-limiting resistors, the multiple current-limiting resistors are connected in series.

3. The low-voltage redundant power supply device as described in claim 1, characterized in that, The discharge circuit includes unidirectional conduction components to prevent reverse connection.

4. The low-voltage redundant power supply device as described in claim 1, characterized in that, Each of the supercapacitors has the same capacitance value, and each of the voltage equalizing resistors has the same resistance value.

5. The low-voltage redundant power supply device as described in claim 2, characterized in that, The current-limiting resistor includes a surface-mount resistor, and when there are multiple surface-mount resistors, each surface-mount resistor has the same resistance value.

6. The low-voltage redundant power supply device as described in claim 3, characterized in that, The unidirectional conducting components include diodes.

7. A low-voltage redundant power supply system for a motor controller, characterized in that, Includes the low-voltage redundant power supply device as described in any one of claims 1-6.

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