Power modules and motor controllers

Abstract

The present application provides a power supply module and a motor controller; wherein the power supply module includes: a voltage conversion circuit and an output circuit; the input end of the voltage conversion circuit is used to input electric energy, and the output end of the voltage conversion circuit is used to output electric energy of a first specified voltage; at least one inductor device is included between the input end and the output end of the voltage conversion circuit, and the inductor device serves as a primary coil; the output circuit includes a secondary coil, and electric energy is transferred from the primary coil to the secondary coil, and the output end of the output circuit is used to output electric energy of a second specified voltage. In this method, the output circuit in the power supply module obtains electric energy through the inductor device in the voltage conversion circuit, and the voltage conversion circuit and the output circuit can both supply power to the outside. Since the electric energy output by the voltage conversion circuit is not transmitted through the coil, the coil loss is reduced and the power supply efficiency is improved. In addition, since the electric energy output by the voltage conversion circuit has a high stability, the stability of the power supply voltage is improved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply module and a motor controller. Background Art

[0002] In the motor controller, the driver, sampling chip, rotary transformer, etc. all need auxiliary power supply. Auxiliary power supply usually uses forward power supply or flyback power supply, which has low power supply efficiency and low stability of supply voltage. Summary of the invention

[0003] In view of this, an object of the present application is to provide a power supply module and a motor controller to improve power supply efficiency and the stability of power supply voltage.

[0004] In a first aspect, an embodiment of the present application provides a power supply module, which includes: a voltage conversion circuit and an output circuit; the input end of the voltage conversion circuit is used to input electric energy, and the output end of the voltage conversion circuit is used to output electric energy of a first specified voltage; at least one inductor device is included between the input end and the output end of the voltage conversion circuit, and the inductor device serves as a primary coil; the output circuit includes a secondary coil, electric energy is transferred from the primary coil to the secondary coil, and the output end of the output circuit is used to output electric energy of a second specified voltage.

[0005] The above-mentioned voltage conversion circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor, a switch tube, a first diode and a first resistor; wherein, the first inductor and the switch tube are connected in series between two contacts at the input end of the voltage conversion circuit; the first capacitor and the second inductor are connected in series to obtain a first branch, and the first branch is connected in parallel with the switch tube; the first diode and the second capacitor are connected in series to obtain a second branch, and the second branch is connected in parallel with the second inductor; the first resistor is connected in parallel with the second capacitor; and both ends of the first resistor serve as the output ends of the voltage conversion circuit.

[0006] The first inductor or the second inductor is used as a primary coil.

[0007] The above-mentioned output circuit also includes: a second diode, a third diode, a third capacitor, a fourth capacitor, a fifth capacitor and a second resistor; wherein the second diode and the third capacitor are connected in series to obtain a third branch, and the third branch is connected in parallel with the secondary coil; the fourth capacitor and the fifth capacitor are connected in series to obtain a fourth branch, and the fourth branch is connected in parallel with the third capacitor; the fourth capacitor and the fifth capacitor are grounded; both ends of the fourth capacitor or both ends of the fifth capacitor serve as output ends of the output circuit; the third diode is connected in series to the fourth capacitor; and the second resistor is connected in series to the fifth capacitor.

[0008] The output circuit comprises a plurality of coils, and the secondary coil of each output circuit is used to transfer electrical energy from the primary coil.

[0009] The voltage conversion circuit includes a Sepic circuit; the output circuit includes a forward circuit.

[0010] In a second aspect, an embodiment of the present application provides a motor controller, which includes the above-mentioned power supply module and also includes a power-consuming circuit; the output end of the voltage conversion circuit and / or the output end of the output circuit in the power supply module supplies power to the power-consuming circuit.

[0011] The power circuit includes a rotary transformer; the rotary transformer is connected to the output end of the voltage conversion circuit in the power module, and the output end of the voltage conversion circuit supplies power to the rotary transformer.

[0012] The power circuit includes a driving tube; the driving tube is connected to the output end of the output circuit in the power module, and the output end of the output circuit supplies power to the driving tube.

[0013] The power circuit includes a sampling chip; the sampling chip is connected to the output end of the voltage conversion circuit in the power module through a voltage stabilizing chip. The electric energy output from the output end of the voltage conversion circuit is converted into voltage by the voltage stabilizing chip and then supplies power to the sampling chip.

[0014] The above-mentioned power supply module and motor controller include a voltage conversion circuit and an output circuit; the input end of the voltage conversion circuit is used to input electric energy, and the output end of the voltage conversion circuit is used to output electric energy of a first specified voltage; at least one inductor device is included between the input end and the output end of the voltage conversion circuit, and the inductor device serves as a primary coil; the output circuit includes a secondary coil, and electric energy is transmitted from the primary coil to the secondary coil, and the output end of the output circuit is used to output electric energy of a second specified voltage.

[0015] In this method, the output circuit in the power module obtains electrical energy through the inductor device in the voltage conversion circuit. Both the voltage conversion circuit and the output circuit can supply power to the outside. Since the electrical energy output by the voltage conversion circuit is not transmitted through the coil, the coil loss is reduced to a certain extent, and the power supply efficiency is improved. In addition, since the electrical energy output by the voltage conversion circuit has high stability, the stability of the power supply voltage is improved.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the circuit structure of a flyback power supply in the related art;

[0019] Figure 2 A schematic diagram of a power module provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of a voltage conversion circuit provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of another power module provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of a motor controller provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of another motor controller provided in an embodiment of the present application;

[0024] Figure 7 A working state waveform diagram of the power module provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of a simulation waveform of a power module provided in an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of a load step simulation waveform of a power module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] In the related art, the auxiliary power supply of the motor controller often uses a forward power supply or a flyback power supply, and the flyback power supply is used as an example for explanation.

[0029] See also Figure 1 The circuit structure diagram of the flyback power supply shown in the figure; the battery or bus provides electrical energy, which is input into the filter circuit, and the electrical energy is transmitted to the secondary coil Ns through the primary coil Np. The flyback power supply has multiple sets of output circuits, including a main feedback circuit, which can output 12V electrical energy. The flyback power supply also includes an output circuit that outputs -7V or 16V.

[0030] The operating frequency of the transformer in the flyback power supply is relatively high, the coil has power loss, and the power conversion efficiency is relatively low, especially under low voltage and full load conditions, the power conversion efficiency is very low.

[0031] In the motor controller, IGBT (Insulate Gate Bipolar Transistor) driver, sampling chip, resolver, etc. all require auxiliary power supply. When the resolver is powered by the -7V or 16V output circuit, the supply voltage of the resolver will change with the load size due to the cross-regulation rate of the flyback power supply. The stability of the supply voltage is low, which in turn affects the accuracy of the resolver data acquisition.

[0032] Based on this, an embodiment of the present application provides a power module and a motor controller, which can be applied to various motor controllers or other devices that require power supply.

[0033] To facilitate understanding of this embodiment, a power module disclosed in an embodiment of the present application is first described in detail. Figure 2 As shown, the power module includes: a voltage conversion circuit 20 and an output circuit 22;

[0034] The input end of the voltage conversion circuit is used to input electric energy, and the output end of the voltage conversion circuit is used to output electric energy of a first specified voltage; at least one inductor device is included between the input end and the output end of the voltage conversion circuit, and the inductor device serves as a primary coil; the output circuit includes a secondary coil, and electric energy is transferred from the primary coil to the secondary coil, and the output end of the output circuit is used to output electric energy of a second specified voltage.

[0035] The input end of the voltage conversion circuit can be connected to a battery or a DC bus, and electrical energy is input through the battery or the DC bus. The voltage conversion circuit is usually a DCDC conversion circuit, which is used to convert the voltage of DC power. The output end of the power conversion circuit can output power of a first specified voltage, for example, 12V voltage, and the magnitude of the first specified voltage can be adjusted according to demand.

[0036] The voltage conversion circuit can be implemented through a variety of circuit structures, but usually the voltage conversion circuit includes an inductor. Depending on the circuit structure, the voltage conversion circuit may include one or more inductors. When the voltage conversion circuit includes only one inductor, the inductor serves as a primary coil. When the voltage conversion circuit includes multiple inductors, one of the inductors may be used as the primary coil.

[0037] The output circuit includes a secondary coil and usually other devices, such as capacitors, resistors, diodes and other devices; the output end of the output circuit is usually the two ends of the capacitor device; in different circuit states, the voltage value of the second specified voltage outputted by the output current is different, for example, the second specified voltage can be 16V or -7V.

[0038] The above-mentioned power supply module includes a voltage conversion circuit and an output circuit; the input end of the voltage conversion circuit is used to input electric energy, and the output end of the voltage conversion circuit is used to output electric energy of a first specified voltage; at least one inductor device is included between the input end and the output end of the voltage conversion circuit, and the inductor device serves as a primary coil; the output circuit includes a secondary coil, and electric energy is transmitted from the primary coil to the secondary coil, and the output end of the output circuit is used to output electric energy of a second specified voltage.

[0039] In this method, the output circuit in the power module obtains electrical energy through the inductor device in the voltage conversion circuit. Both the voltage conversion circuit and the output circuit can supply power to the outside. Since the electrical energy output by the voltage conversion circuit is not transmitted through the coil, the coil loss is reduced to a certain extent, and the power supply efficiency is improved. In addition, since the electrical energy output by the voltage conversion circuit has high stability, the stability of the power supply voltage is improved.

[0040] For a specific implementation, see Figure 3 The schematic diagram of the voltage conversion circuit shown in FIG. 1 ; the voltage conversion circuit includes a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a switch tube S1, a first diode D1 and a first resistor R1;

[0041] Among them, the first inductor and the switch tube are connected in series between the two contacts at the input end of the voltage conversion circuit; the input voltage between the two contacts at the input end is represented by V1. The first capacitor and the second inductor are connected in series to obtain a first branch, and the first branch is connected in parallel with the switch tube; the first diode and the second capacitor are connected in series to obtain a second branch, and the second branch is connected in parallel with the second inductor; the first resistor is connected in parallel with the second capacitor; the two ends of the first resistor serve as the output ends of the voltage conversion circuit. The voltage across the first resistor, that is, the voltage at the output end of the voltage conversion circuit is represented by V2.

[0042] In the above voltage conversion circuit, the first inductor or the second inductor serves as a primary coil. That is, since both the first inductor and the second inductor flow through the circuit, both the first inductor and the second inductor can serve as primary coils to provide electrical energy to the output circuit.

[0043] See also Figure 4 The schematic diagram of the power module is shown in Figure 4In the example, the second inductor serves as the primary coil Np. The output circuit further includes: a second diode D2, a third diode D3, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a second resistor R2;

[0044] Among them, the second diode and the third capacitor are connected in series to obtain a third branch, and the third branch is connected in parallel with the secondary coil Ns; the fourth capacitor and the fifth capacitor are connected in series to obtain a fourth branch, and the fourth branch is connected in parallel with the third capacitor; the fourth capacitor and the fifth capacitor are grounded, and the grounding is represented by GND; the two ends of the fourth capacitor or the two ends of the fifth capacitor serve as the output ends of the output circuit; the third diode is connected in series with the fourth capacitor; and the second resistor is connected in series with the fifth capacitor.

[0045] exist Figure 4 In the embodiment, the output end of the output circuit can output two second specified voltages of +16V and -7V.

[0046] Furthermore, the output circuit includes a plurality of secondary coils of each output circuit for transferring electrical energy from the primary coil. The number of output circuits can be set as required. Figure 4 Taking two output circuits as an example, the structures of the two output circuits and the second designated voltages outputted are the same.

[0047] In a specific implementation, the voltage conversion circuit includes a Sepic circuit; and the output circuit includes a forward circuit.

[0048] The Sepic circuit is a buck-boost topology circuit that uses the L2 inductor of the Sepic circuit as the input winding of the forward circuit, i.e., the primary coil, saving the excitation winding of the forward circuit; the output of the Sepic circuit can power the rotary transformer, saving the output winding of the forward circuit that powers the rotary transformer.

[0049] The output end of the positive circuit supplies power to the driver tube, and voltage fluctuations will not affect the output voltage of the Sepic circuit, thus improving the power supply stability and efficiency of the power supply.

[0050] In the related art, if the power input needs to take into account a wide range of voltages, the related devices of the power supply, such as capacitors, diodes, MOSFET (Metal Oxide Semiconductor Field Effect Transistor, MOS for short), etc., need to have high voltage resistance and high cost. The power module in this embodiment avoids the influence of a wide range of voltages on the efficiency of the forward circuit through a multi-channel isolated power supply method, reduces the device loss of the RCD absorption circuit, and saves the winding of the transformer.

[0051] This embodiment also provides a motor controller, see Figure 5 As shown, the motor controller includes the above-mentioned power module 50 and also includes a power-consuming circuit 52; the output end of the voltage conversion circuit and / or the output end of the output circuit in the power module supplies power to the power-consuming circuit.

[0052] The output ends of the voltage conversion circuit and the output circuit can supply power to different power-consuming circuits. When there are fewer power-consuming circuits, the power-consuming circuits can be powered only through the output end of the voltage conversion circuit, or only through the output end of the output circuit. Alternatively, the output end of the voltage conversion circuit or the output circuit can be selected to supply power to the power-consuming circuit according to the power supply requirements of the power-consuming circuit.

[0053] When there are many power-consuming circuits, power can be supplied to the corresponding power-consuming circuits through the output ends of the voltage conversion circuit and the output circuit at the same time.

[0054] For details, see Figure 6 The above-mentioned power circuit includes a rotary transformer; the rotary transformer is connected to the output end of the voltage conversion circuit in the power module, and the output end of the voltage conversion circuit supplies power to the rotary transformer.

[0055] This method can save the windings required to power the rotary transformer, reduce the power loss generated by the windings, improve the power supply efficiency, and provide a stable power supply voltage to the rotary transformer, thereby improving the accuracy of rotary transformer sampling.

[0056] In addition, in the related technology, the rotating transformer can also draw power through an SBC (System Basis Chip) chip. The SBC chip is connected to a battery or a DC bus and can output a stable and accurate voltage to power the rotating transformer, but the cost of the SBC chip is relatively high.

[0057] The power module of this embodiment supplies power to the selection transformer through the output end of the voltage conversion circuit, and can also provide a stable and accurate voltage, but the circuit cost is low.

[0058] Furthermore, the power circuit includes a driver tube 62; the driver tube is connected to the output end of the output circuit in the power module, and the output end of the output circuit supplies power to the driver tube. The output circuit supplies power to the driver tube, such as an IGBT tube, and can provide the driver tube with a power supply voltage of 16V or -7V in two different states.

[0059] In addition, the power circuit includes a sampling chip 64; the sampling chip is connected to the output end of the voltage conversion circuit in the power module through a voltage regulator chip 66, and the electric energy output from the output end of the voltage conversion circuit is converted into voltage by the voltage regulator chip and then supplies power to the sampling chip.

[0060] The voltage stabilizing chip can convert the first specified voltage at the output end of the voltage conversion circuit to the power supply voltage required by the sampling chip. For example, when the first specified voltage is 12V, the voltage stabilizing chip converts the first specified voltage to 5V and then supplies power to the sampling chip.

[0061] In the above method, the rotary transformer and the sampling chip are powered by the voltage conversion circuit, and the driving tube is powered by the coil and the output circuit. The power output end of the voltage conversion circuit is isolated from the output circuit, and the power supply efficiency of the voltage conversion circuit is relatively high, thereby realizing a high-efficiency and multi-channel isolated power output method.

[0062] Figure 7 Shows Figure 4 In the working state waveform of the power module, the voltage of C3 in the output circuit changes with the current of the inductor L2 in the voltage conversion circuit, and in the voltage conversion circuit, the current change trends of the inductor L1 and the inductor L2 are the same.

[0063] Figure 8 Shows Figure 4 Schematic diagram of the simulation waveform of the power module. Fig. 9 A schematic diagram of the load step simulation waveform of the power module is shown.

[0064] In order to test the load dynamic response and convergence performance of the power module, a programmable current source is connected to the output end of the output circuit. At 27ms of the simulation, the current source steps from 20mA to 80mA. At 35ms of the simulation, the current source steps from 80mA to 20mA to simulate the change of the output load of the output circuit. Observe the overshoot and recovery time of each output voltage. The waveform is as follows: Fig. 9 As shown in the figure, by observing the waveform, it can be seen that the overshoot amplitude of the output voltage is much smaller than 1% of the output voltage, and it can quickly return to a steady state, indicating that the power module has good dynamic performance, that is, the power supply of the motor controller also has the ability to quickly adjust under various complex working conditions to ensure the stable operation of the entire electronic control drive system.

[0065] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0066] In addition, in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0067] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0068] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0069] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art who is familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A power module, characterized in that: The power supply module includes: a voltage conversion circuit and an output circuit; The input end of the voltage conversion circuit is used to input electric energy, and the output end of the voltage conversion circuit is used to output electric energy of a first specified voltage; The voltage conversion circuit includes at least one inductor between the input terminal and the output terminal, and the inductor serves as a primary coil; The output circuit includes a secondary coil, electric energy is transferred from the primary coil to the secondary coil, and the output end of the output circuit is used to output electric energy of a second specified voltage.

2. The power module according to claim 1, characterized in that: The voltage conversion circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor, a switch tube, a first diode and a first resistor; Wherein, the first inductor and the switch tube are connected in series between two contacts at the input end of the voltage conversion circuit; The first capacitor and the second inductor are connected in series to obtain a first branch, and the first branch is connected in parallel with the switch tube; The first diode and the second capacitor are connected in series to obtain a second branch, the second branch is connected in parallel with the second inductor; the first resistor is connected in parallel with the second capacitor; Two ends of the first resistor serve as output ends of the voltage conversion circuit.

3. The power module according to claim 2, characterized in that: The first inductor or the second inductor serves as the primary coil.

4. The power module according to claim 1, characterized in that: The output circuit further includes: a second diode, a third diode, a third capacitor, a fourth capacitor, a fifth capacitor and a second resistor; Wherein, the second diode and the third capacitor are connected in series to obtain a third branch, and the third branch is connected in parallel with the secondary coil; The fourth capacitor and the fifth capacitor are connected in series to obtain a fourth branch, and the fourth branch is connected in parallel with the third capacitor; the fourth capacitor and the fifth capacitor are grounded; both ends of the fourth capacitor or both ends of the fifth capacitor serve as output ends of the output circuit; The third diode is connected in series with the fourth capacitor; the second resistor is connected in series with the fifth capacitor.

5. The power module according to claim 1, characterized in that: The output circuit includes a plurality of secondary coils, each of which is used to transfer electrical energy from the primary coil.

6. The power module according to claim 1, characterized in that: The voltage conversion circuit includes a Sepic circuit; and the output circuit includes a forward circuit.

7. A motor controller, characterized in that: The motor controller comprises the power module according to any one of claims 1 to 6, and also comprises a power circuit; The output end of the voltage conversion circuit and / or the output end of the output circuit in the power module supplies power to the power-consuming circuit.

8. The motor controller according to claim 7, characterized in that: The power circuit includes a rotary transformer; The rotary transformer is connected to the output end of the voltage conversion circuit in the power module, and the output end of the voltage conversion circuit supplies power to the rotary transformer.

9. The motor controller according to claim 7, characterized in that: The power circuit includes a driving tube; The driving tube is connected to the output end of the output circuit in the power module, and the output end of the output circuit supplies power to the driving tube.

10. The motor controller according to claim 7, characterized in that: The power circuit includes a sampling chip; The sampling chip is connected to the output end of the voltage conversion circuit in the power module through the voltage stabilizing chip. The electric energy outputted from the output end of the voltage conversion circuit is converted into voltage by the voltage stabilizing chip and then supplies power to the sampling chip.

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