Power supply circuit compatible with different input voltages, circuit board and motor controller

Abstract

The invention relates to a power supply circuit compatible with different input voltages, a circuit board and a motor controller, a main power circuit of the power supply circuit comprises a first bus capacitor branch and a second bus capacitor branch, the first bus capacitor branch is connected in series between a positive electrode and a negative electrode of a direct current bus through a first reserved branch; the second bus capacitor branch is connected in series between the positive electrode and the negative electrode of the DC bus through the second reserved branch, and the first bus capacitor branch, the third reserved branch and the second bus capacitor branch are sequentially connected in series between the positive electrode and the negative electrode of the DC bus. And switching the serial connection mode and the parallel connection mode of the first bus capacitor branch and the second bus capacitor branch through connection of at least one of the first reserved branch, the second reserved branch and the third reserved branch. By conducting the corresponding reserved branches and ingeniously selecting the series-parallel connection relation of the bus capacitors, compatibility of different input voltages is achieved, the product development cycle is effectively shortened, the research and development cost is effectively reduced, and the development efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of driver power supply circuit technology, and more specifically to a power supply circuit, circuit board, and motor controller compatible with different input voltages. Background Technology

[0002] With the development of servo drives and frequency converters, their applications are becoming increasingly widespread.

[0003] However, existing servo drive or frequency converter manufacturers often design the circuit boards and drive dimensions separately for 220V and 380V series drives due to different voltage levels, increasing mold costs and the number of circuit board models. Furthermore, even though drives of different voltage levels and similar power ratings share a common mold and have similar circuit board dimensions, the power section of drives of different voltage levels is still designed as two separate circuit boards. This increase in circuit board models wastes development resources, lengthens project cycles, and increases material control costs.

[0004] Existing drivers with different voltage levels, such as 220V and 380V series drivers, have their power boards designed separately because the power supply circuits of the 220V and 380V series drivers are incompatible due to their different voltage levels, requiring the design of multiple circuit boards. This is because existing electrolytic capacitors are generally designed to withstand a maximum voltage of 500V DC, while the more common design is 400V DC. Therefore, for 220V input, one or more capacitors are used in parallel, while the 380V series requires capacitors to be connected in series to withstand the higher voltage. Thus, existing technologies generally design 220V and 380V series drivers separately. The power supply circuit mainly includes a switching power supply and a main power circuit. The main power circuit powers the motor, while the switching power supply circuit powers the drive circuit and control chip.

[0005] like Figure 1 As shown, the main power circuit includes a rectifier circuit 1, a power-on buffer circuit 2, and an inverter circuit 3.

[0006] like Figure 2 As shown, in the main power circuit, for a 220V input power supply driver, the bus capacitor between the two poles of the DC bus is selected and set only according to the power rating, specifically the bus capacitor EC1. For example... Figure 3 As shown, when the input power supply is a 380V series driver, two bus capacitors EC1 and EC2 need to be connected in series to improve the withstand voltage and solve the problem of insufficient withstand voltage of a single capacitor.

[0007] exist Figure 4 In the switching power supply circuit shown, when using a 220V series driver, the switching power supply uses one input capacitor E13. For example... Figure 4As shown, when it is a 380V series driver, the first input capacitor EC13 and the second input capacitor E14 are connected in series.

[0008] Therefore, existing driver product circuit board designs cannot be compatible with different input voltages, resulting in high product development costs, long development cycles, and low efficiency. Summary of the Invention

[0009] To address the aforementioned problems, the present invention aims to provide a power supply circuit, circuit board, and motor controller compatible with different input voltages, thereby resolving the technical issues of existing driver circuit boards being incompatible with different input voltages, resulting in high product development costs, long development cycles, and low efficiency. The details are described below.

[0010] Firstly, this embodiment provides a power supply circuit compatible with different input voltages, including a main power circuit and a switching power supply circuit:

[0011] The main power circuit includes a first bus capacitor branch and a second bus capacitor branch. The first bus capacitor branch is connected in series between the positive and negative terminals of the DC bus through a first reserved branch. The second bus capacitor branch is connected in series between the positive and negative terminals of the DC bus through a second reserved branch. The first bus capacitor branch, the third reserved branch, and the second bus capacitor branch are connected in series between the positive and negative terminals of the DC bus in sequence. The series and parallel connection modes of the first bus capacitor branch and the second bus capacitor branch are switched by turning on at least one of the first reserved branch, the second reserved branch, and the third reserved branch.

[0012] The switching power supply circuit includes a capacitor branch and a resistor branch connected to the output terminal of the rectifier circuit. The capacitor branch includes a reserved capacitor branch and a second capacitor branch connected in series. The resistor branch includes a reserved resistor branch and a second resistor branch connected in series. The reserved resistor branch and the reserved capacitor branch are connected in parallel, and the second resistor branch and the second capacitor branch are connected in parallel.

[0013] In one embodiment, the first reserved branch, the second reserved branch, and the third reserved branch include connection branches for setting conductive elements; the bus capacitor circuit also includes a first equalizing resistor branch and a first filter capacitor branch connected in parallel with the first bus capacitor branch, and a second equalizing resistor branch and a second filter capacitor branch connected in parallel with the second bus capacitor branch.

[0014] In the above embodiments, when the input voltage is a first voltage value, such as 220V, a conductive element is provided on the connecting branch of the first reserved branch and the second reserved branch, a first bus capacitor and a second bus capacitor are respectively provided on the first bus capacitor branch and the second bus capacitor branch, and a first filter capacitor is provided on the first filter capacitor branch, so that the first bus capacitor branch and the second bus capacitor branch are connected in parallel.

[0015] In the above embodiments, when the input voltage is a first voltage value, such as 220V, a conductive element is provided on the connecting branch of the second reserved branch, a second bus capacitor is provided on the second bus capacitor branch, and a second filter capacitor is provided on the second filter capacitor branch to select the second bus capacitor branch; or a conductive element is provided on the connecting branch of the first reserved branch, a first bus capacitor is provided on the first bus capacitor branch, and a first filter capacitor is provided on the first filter capacitor branch to select the first bus capacitor branch.

[0016] In the above embodiment, when the input voltage is a second voltage value, such as 380V, a conductive element is provided on the connection branch of the third reserved branch. A first bus capacitor and a second bus capacitor are respectively provided on the first bus capacitor branch and the second bus capacitor branch. A first voltage equalizing resistor is provided on the first voltage equalizing resistor branch and a second voltage equalizing resistor is provided on the second voltage equalizing resistor branch. A first filter capacitor is provided on the first filter capacitor branch and a second filter capacitor is provided on the second filter capacitor branch, so that the first bus capacitor branch and the second bus capacitor branch are connected in series.

[0017] In one embodiment, the rectifier circuit is a rectifier bridge, with a reserved capacitor branch and a second capacitor branch connected in series across the positive and negative output terminals of the rectifier bridge; the reserved resistor branch includes a connection branch for setting a current-limiting resistor, the second resistor branch includes a third current-limiting resistor and a fourth current-limiting resistor, and the reserved capacitor branch includes a connection branch for setting an energy storage capacitor.

[0018] In the above embodiment, when the input voltage is a first voltage value, such as 220V, a first current-limiting resistor and a second current-limiting resistor are connected in series on the reserved resistor branch. Both the first current-limiting resistor and the second current-limiting resistor are zero-ohm resistors, so that only the second capacitor branch is selected.

[0019] In the above embodiment, when the input voltage is a second voltage value, such as 380V, an energy storage capacitor is set on the connection branch of the reserved capacitor branch, and a first current-limiting resistor and a second current-limiting resistor are set in series on the reserved resistor branch. The resistance values ​​of the first current-limiting resistor and the second current-limiting resistor are the same as the resistance values ​​of the third current-limiting resistor and the fourth current-limiting resistor, so that the reserved capacitor branch and the second capacitor branch are connected in series.

[0020] According to a second aspect, this embodiment provides a circuit board including a power supply circuit compatible with different input voltages according to any embodiment of the first aspect.

[0021] According to a third aspect, this embodiment provides a motor controller that includes the circuit board described in the second aspect.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention employs a power circuit design with compatible input power supplies, placing power circuits for different input power supplies on the same circuit board, thereby reducing costs and improving product development efficiency.

[0024] By designing a power supply circuit compatible with 220V and 380V input voltages, the bus capacitors are connected by corresponding reserved branch conductive components, thus allowing for simple and ingenious selection of series and parallel connections of the bus capacitors. This adapts to different voltage levels, effectively reducing product development cycles, R&D costs, and circuit board models, and improving development efficiency. Attached Figure Description

[0025] Figure 1 The circuit schematic of the main power circuit of the existing driver;

[0026] Figure 2 The main power circuit of the existing driver uses a bus capacitor circuit diagram with a 220V input power supply;

[0027] Figure 3 The circuit diagram of the withstand voltage bus capacitor for the main power circuit of the existing driver using a 380V input power supply.

[0028] Figure 4 The circuit diagram of the filter capacitor for the switching power supply circuit of the existing driver using a 220V input power supply;

[0029] Figure 5 The circuit diagram of the filter capacitor for the switching power supply circuit of the existing driver using a 380V input power supply;

[0030] Figure 6 This is a block diagram of the power supply circuit of the driver in this embodiment;

[0031] Figure 7 for Figure 6 The circuit diagram of the bus capacitor circuit shown is shown.

[0032] Figure 8 for Figure 7 The equivalent circuit diagram of the bus capacitor circuit shown is presented at an input voltage of 220V.

[0033] Figure 9 for Figure 7 The equivalent circuit diagram of the bus capacitor circuit shown is presented at an input voltage of 380V.

[0034] Figure 10 This is a circuit block diagram of the switching power supply circuit in this embodiment;

[0035] Figure 11 for Figure 10 The circuit diagram shown is the equivalent circuit diagram of the switching power supply circuit at an input voltage of 220V. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0037] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0038] The serial numbers assigned to components in this document, such as "first" and "second," are used solely to distinguish the described objects and have no sequential or technical meaning. "Multiple" means two or more. Unless otherwise specified, "connection" or "linkage" in this application includes both direct and indirect connections (linkages).

[0039] Please refer to Figure 6 The diagram shows a power supply circuit block diagram of the driver in this embodiment. The power supply circuit includes a power supply terminal 1. The output of the power supply terminal 1 is connected to a main power circuit for supplying power to the motor and a switching power supply circuit for supplying power to the drive circuit and the control chip.

[0040] The main power circuit includes a first rectifier circuit 2, a bus capacitor circuit 4, and an inverter module 6. The first rectifier circuit 2 rectifies and outputs high-voltage DC power to the inverter module 6, obtaining three-phase AC grid output DC power from the power supply terminal 1; it includes a high-potential connection terminal P for providing high DC potential and a low-potential connection terminal N for outputting low DC potential. The inverter module 6 is connected in parallel between the high-potential and low-potential connection terminals to convert the DC power into three-phase AC power for motor operation.

[0041] The switching power supply circuit includes a second rectifier circuit 3, an input compatibility circuit 7, and a DC flyback power supply 9. The DC flyback power supply 9 is a flyback power supply design. The second rectifier circuit 3 is used to rectify and output low-voltage DC power to the flyback power supply circuit 9.

[0042] The circuit board compatibility design of the main power circuit and switching power supply circuit in this embodiment can effectively reduce the number of circuit board models used. For example, the 220V series 2KW and the 380V series 2KW drivers are almost the same size. After designing them as compatible circuit boards, only the corresponding reserved branches need to be connected on the circuit board of the shared power circuit, thereby greatly shortening the project development cycle.

[0043] Please refer to Figure 7 The circuit diagram of the reserved circuit board for the bus capacitor circuit of the main power circuit shown.

[0044] For the main power circuit, the bus capacitor circuit 4 includes a first bus capacitor branch and a second bus capacitor branch. The first bus capacitor branch is connected in series between the positive terminal P and the negative terminal N of the DC bus via a first reserved branch, and the second bus capacitor branch is connected in series between the positive terminal P and the negative terminal N of the DC bus via a second reserved branch. The first bus capacitor branch, the third reserved branch, and the second bus capacitor branch are sequentially connected in series between the positive terminal P and the negative terminal N of the DC bus. The series and parallel connection modes of the first bus capacitor branch and the second bus capacitor branch are switched by turning on at least one of the first reserved branch, the second reserved branch, and the third reserved branch.

[0045] The first reserved branch, the second reserved branch, and the third reserved branch include connecting branches for setting conductive elements. In this embodiment, the conductive element can be any metal conductive connector. The reserved branch is made conductive by setting the conductive element on the connecting branch of the corresponding reserved branch.

[0046] Depending on the input voltage used by the driver, the first reserved branch, the second reserved branch, and the third reserved branch are equipped with conductive elements to realize the series or parallel connection of the first bus capacitor branch and the second bus capacitor branch; or when the input voltage is low, one of the first reserved branch and the second reserved branch is selected to be turned on.

[0047] like Figure 10 As shown, for a switching power supply circuit, the input compatible circuit includes a capacitor branch and a resistor branch connected to the output terminal of the rectifier circuit DBD1.

[0048] The capacitor branch includes a reserved capacitor branch connected in series at the output terminal and a second capacitor branch. The resistor branch includes a reserved resistor branch and a second resistor branch connected in series. The reserved resistor branch and the reserved capacitor branch are connected in parallel, and the second resistor branch and the second capacitor branch are connected in parallel. The series connection relationship of the second capacitor branch is switched by connecting the reserved capacitor branch according to the input voltage.

[0049] The following example illustrates the structure of bus capacitor circuit 4.

[0050] The bus capacitor circuit 4 also includes a first equalizing resistor branch and a first filter capacitor branch connected in parallel with the first bus capacitor branch, and a second equalizing resistor branch and a second filter capacitor branch connected in parallel with the second bus capacitor branch.

[0051] Please refer to Figure 7 A first conductive element J1 can be installed on the first reserved branch, a second conductive element J2 can be installed on the second reserved branch, and a third conductive element J3 can be installed on the third reserved branch. A first bus capacitor EC1 can be installed on the first bus capacitor branch. A second bus capacitor EC2 can be installed on the second bus capacitor branch. A first voltage equalizing resistor R81 can be installed on the first voltage equalizing resistor branch, and a first filter capacitor C172 can be installed on the first filter capacitor branch. A second voltage equalizing resistor R82 can be installed on the second voltage equalizing resistor branch, and a second filter capacitor C173 can be installed on the second filter capacitor branch. For example... Figure 7 As shown, the first conductive element J1 of the first reserved branch is connected in series with the first bus capacitor EC1, and the first equalizing resistor R81 and the first filter capacitor C172 are connected in parallel with the first bus capacitor EC1. The second conductive element J2 of the second reserved branch is connected in series with the second bus capacitor EC2, and the second equalizing resistor R82 and the second filter capacitor C173 are connected in parallel with the second bus capacitor EC2. The first bus capacitor branch, the third conductive element J3 of the third reserved branch, and the second bus capacitor branch are connected in series between the positive terminal P and the negative terminal N of the DC bus. The series and parallel connection mode of the first bus capacitor EC1 and the second bus capacitor EC2 can be switched by turning on at least one of the first, second, and third reserved branches. The third reserved branch is the third conductive element J3 at the reserved point. The second conductive element J2 and the first conductive element J1 can be connected through the third conductive element J3 at the reserved point.

[0052] When the input voltage is a first voltage value, which in this embodiment is 220V, a first conductive element J1 is provided on the first reserved branch, and a second conductive element J2 is provided on the connecting branch of the second reserved branch. A first bus capacitor EC1 and a second bus capacitor EC2 are respectively provided on the first bus capacitor branch and the second bus capacitor branch. A first filter capacitor C172 is provided on the first filter capacitor branch, so that the first bus capacitor branch and the second bus capacitor branch are connected in parallel. Specifically, as follows... Figure 8 As shown, when the input voltage is 220V, the corresponding reserved branch needs to be turned on. The main power circuit is equipped with a second conductive element J2, a first conductive element J1, and a first filter capacitor C172, so that the first bus capacitor EC1 and the second bus capacitor EC2 are connected in parallel.

[0053] In practical operation, when using a 220V series driver, in Figure 7The operation before the main power circuit is put into use includes: setting the second conductive component J2 and the first conductive component J1 to be on. The third conductive component J3 is left unconnected. At this time, the first bus capacitor EC1 and the second bus capacitor EC2 are connected in parallel. Since no voltage equalizing resistor is needed, the first voltage equalizing resistor R81 and the second voltage equalizing resistor R82 are left unconnected. The first filter capacitor C172 is set to be on, and the second filter capacitor C173 is left unconnected. Figure 8 The diagram shown is the equivalent circuit diagram of the main power circuit after the surface mount and soldering processes are completed when the input voltage is 220V.

[0054] When the input voltage is 220V, the first bus capacitor branch and the second bus capacitor branch can be connected in parallel, or a single bus capacitor can be used. This includes installing a conductive element on the connecting branch of the second reserved branch, installing a second bus capacitor EC2 on the second bus capacitor branch, and installing a second filter capacitor C173 on the second filter capacitor branch to select the second bus capacitor branch; or installing a conductive element on the connecting branch of the first reserved branch, installing a first bus capacitor EC1 on the first bus capacitor branch, and installing a first filter capacitor C172 on the first filter capacitor branch to select the first bus capacitor branch. For example, the second conductive element J2, the second bus capacitor EC2, and the second filter capacitor C173 can be connected to select the second bus capacitor branch. Alternatively, the first conductive element J1, the first bus capacitor EC1, and the first filter capacitor C172 can be connected to select the first bus capacitor branch.

[0055] When the input voltage is the second voltage value, which in this embodiment is 380V, a conductive element, namely the third conductive element J3, is provided on the connecting branch of the third reserved branch. A first bus capacitor EC1 and a second bus capacitor EC2 are respectively provided on the first bus capacitor branch and the second bus capacitor branch. A first voltage equalizing resistor R81 is provided on the first voltage equalizing resistor branch and a second voltage equalizing resistor R82 is provided on the second voltage equalizing resistor branch. A first filter capacitor C172 is provided on the first filter capacitor branch and a second filter capacitor C173 is provided on the second filter capacitor branch, so that the first bus capacitor branch and the second bus capacitor branch are connected in series.

[0056] For example, when the input voltage is 380V, the main power circuit is turned on to set the third conductive component J3, the first bus capacitor EC1, the second bus capacitor EC2, the first voltage equalizing resistor R81, the second voltage equalizing resistor R82, the first filter capacitor C172, and the second filter capacitor C173, so that the first bus capacitor EC1 and the second bus capacitor EC2 are connected in series to improve the withstand voltage performance. Figure 9 The diagram shown is the equivalent circuit diagram of the main power circuit after the surface mount and soldering processes are completed when the input voltage is 380V.

[0057] In actual operation, when using a 380V series driver, the second conductive element J2 and the first conductive element J1 are not connected, and the third conductive element J3 is set to be on. At this time, the first bus capacitor EC1 and the second bus capacitor EC2 are connected in series. At the same time, the first voltage equalizing resistor R81 and the second voltage equalizing resistor R82 are set to be on, and their function is to act as voltage equalizing resistors. The first filter capacitor C172 and the second filter capacitor C173 are set to be on.

[0058] Since the standard withstand voltage of bus capacitors is 400V or even 500V, the bus voltage after rectification of a standard 380V AC circuit is 540V DC. Considering the relatively wide input voltage range, a single bus capacitor cannot support 540V or even 700V DC. Therefore, it is necessary to connect multiple bus capacitors in series to divide the voltage and connect voltage-equalizing resistors in parallel across the capacitors to solve the high withstand voltage problem, while ensuring that the positive and negative terminals of the bus capacitors correspond.

[0059] exist Figure 9 In the circuit shown, the second conductive element J2 and the first conductive element J1 can be shorted with appropriate power and size depending on the power requirement. When only the third conductive element J3 is set, and the first conductive element J1 and the second conductive element J2 are not connected, the first bus capacitor EC1 and the second bus capacitor EC2 can be connected in series, which also solves the problem of capacitor polarity. When only the second conductive element J2 and the first conductive element J1 are connected, and the third conductive element J3 is not connected, the first bus capacitor EC1 and the second bus capacitor EC2 are connected in parallel. The number of capacitors and conductive elements connected can also be selected according to the power requirement.

[0060] Because the 380V driver has a high voltage rating and the electrolytic capacitors are connected in series, if a voltage equalization resistor is not connected in parallel, the voltage across the two electrolytic capacitors will be uneven. Therefore, when using a 380V input power supply, a compatible power supply circuit board must be equipped with a first voltage equalization resistor R81 and a second voltage equalization resistor R82. The resistance value and power rating should be selected according to actual needs.

[0061] exist Figure 7 In the reserved compatible power supply circuit shown, several bleeder resistors are connected in series and parallel on the bus circuit 4, near the bus capacitor circuit. The national standard requires that the bus voltage drop to a safe voltage below 36V after 15 minutes of power failure. Therefore, several bleeder resistors are provided, including the first bleeder resistor R128, the second bleeder resistor R129, the third bleeder resistor R80, the fourth bleeder resistor R133, the fifth bleeder resistor R94, the sixth bleeder resistor R83, and the seventh bleeder resistor R136. The function of these bleeder resistors is to dissipate the charge of the bus capacitor after power failure, preventing electric shock. Different resistance values ​​can be selected for the 220V and 380V series bleeder resistors.

[0062] exist Figure 7In the middle, indicator LED1 is the bus voltage indicator, used to indicate the status of bus voltage failure, so as to alert the user whether the bus capacitor has a charge.

[0063] Please refer to Figure 10 The circuit diagram shown is a compatible circuit diagram of a switching power supply circuit. The DC flyback power supply 7 includes a PWM generator U1 and a reserved-point switching transistor Q4. When the input voltage is 220V, the switching transistor Q4 is selected as the first voltage-rated switching transistor; when the input voltage is 380V, the switching transistor Q4 is selected as the second voltage-rated switching transistor.

[0064] The input varistor RV1 can be selected according to the voltage level. The NTC resistor RT1 limits the startup current and protects the downstream circuitry of the switching power supply. DBD1 is the rectifier bridge. The PWM generator U1 of the DC flyback power supply is connected to the switching transistor Q4, which is a MOSFET. The DC flyback power supply, also known as the RCD circuit, uses a flyback power supply design, which will not be elaborated upon here.

[0065] Among them, the input varistor V1 is an MOV device, which can be flexibly selected according to the different voltages of 220V and 380V. Any MOV of the same series and size can be selected. The switching transistor Q4 is a MOSFET. When the input is 220V, the first voltage-rated switching transistor selected is an 800V or 1000V MOSFET. When the input is 380V, the second voltage-rated switching transistor selected is a 1500V MOSFET.

[0066] The second rectifier circuit 3 uses a rectifier bridge rectifier DBD1. Due to the low power of the switching power supply, a rectifier bridge rectifier with a withstand voltage of 1000V / 2A is selected. The output of the second rectifier circuit 3 is connected to the input compatibility circuit 7. This input compatibility circuit 7 includes a reserved capacitor branch and a second capacitor branch.

[0067] The DC output positive and negative terminals of the rectifier bridge DBD1 are connected in series with a reserved capacitor branch and a second capacitor branch. The reserved capacitor branch includes a connection branch for setting an energy storage capacitor, E13, which can be conductively connected to this branch. A second input capacitor E14 is installed on this second capacitor branch. The reserved resistor branch includes a connection branch for setting current-limiting resistors, and the second resistor branch includes a third current-limiting resistor R40 and a fourth current-limiting resistor R46. The energy storage capacitor E13 is connected in parallel with a third filter capacitor branch. A third filter capacitor C170 can be conductively connected to this third filter capacitor branch.

[0068] The energy storage capacitor E13 is connected in series with the second input capacitor E14. The reserved resistor branch includes a first current-limiting resistor R25 and a second current-limiting resistor R38 at a reserved location. The second resistor branch includes a third current-limiting resistor 40 and a fourth current-limiting resistor 46. The first current-limiting resistor 25 and the second current-limiting resistor 38 are connected in series, and then in parallel with the energy storage capacitor E13. The second input capacitor E14 is connected in parallel with the fourth filter capacitor C171, and also in parallel with this second resistor branch.

[0069] In the following embodiments, the reserved capacitor branch is used as an example of the reserved circuit. The principle of the second capacitor branch as a reserved circuit is the same.

[0070] When the input voltage is the first voltage value, in this embodiment, the input voltage is 220V. The energy storage capacitor E13 and the third filter capacitor C170 are not connected. A first current-limiting resistor R25 and a second current-limiting resistor R38 are connected in series on the reserved resistor branch. Both the first current-limiting resistor R25 and the second current-limiting resistor R38 are zero-ohm resistors, ensuring that only the second capacitor branch is selected. Please refer to... Figure 11 The equivalent circuit diagram of the compatible switching power supply circuit is shown. When the input voltage is 220V, the conducting elements include the first current-limiting resistor R25 and the second current-limiting resistor R38. Both the first current-limiting resistor R25 and the second current-limiting resistor R38 are zero-ohm resistors, so that only the second capacitor branch, that is, the second input capacitor E14, is selected.

[0071] In practice, for the 220V series driver, the energy storage capacitor E13 and the third filter capacitor C170 are left unconnected. The first current-limiting resistor R25 and the second current-limiting resistor R38 are set to zero ohms.

[0072] When the input voltage is the second voltage value, in this embodiment the input voltage is 380V. An energy storage capacitor E13 is installed on the connection branch of the reserved capacitor branch, and a third filter capacitor C170 is installed on the third filter capacitor branch. A first current-limiting resistor and a second current-limiting resistor are connected in series on the reserved resistor branch. The resistance values ​​of the first and second current-limiting resistors are the same as the resistance values ​​of the third and fourth current-limiting resistors, so that the energy storage capacitor E13 is connected in series with the second input capacitor E14.

[0073] like Figure 10 As shown, when the input voltage is 380V, the first current-limiting resistor R25, the second current-limiting resistor R38, the third filter capacitor C170, and the energy storage capacitor E13 are connected. The resistance values ​​of the first current-limiting resistor R25 and the second current-limiting resistor R38 are the same as the resistance values ​​of the third current-limiting resistor R40 and the fourth current-limiting resistor R46, so that the reserved capacitor branch is connected in series with the second capacitor branch.

[0074] In practical operation, for the 380V series driver, the energy storage capacitor E13 and the third filter capacitor C170 are set to conduct, and the first current-limiting resistor R25 and the second current-limiting resistor R38 are 100KΩ resistors. At 380V, the resistance values ​​of the first current-limiting resistor R25 and the second current-limiting resistor R38 are consistent with those of the third current-limiting resistor R40 and the fourth current-limiting resistor R46, for example, 100KΩ resistors. Because the 380V driver has a high voltage level and the electrolytic capacitors are connected in series, if a voltage-equalizing resistor is not connected in parallel, the voltage across the two electrolytic capacitors will be uneven, which may damage the bus capacitors. Therefore, the 380V driver must have a first current-limiting resistor R25 and a second current-limiting resistor R38, and their resistance values ​​and power ratings should be selected according to actual needs. The first current-limiting resistor R25, the second current-limiting resistor R38, the third current-limiting resistor R40, and the fourth current-limiting resistor R46 are the starting current-limiting resistors for the switching power supply and can be selected and adjusted according to the PWM controller and the voltage level.

[0075] Please refer to Figure 6 This embodiment also relates to a circuit board, which includes the aforementioned power supply circuit compatible with different input voltages.

[0076] In addition, this embodiment also relates to a motor controller that uses the aforementioned circuit board.

[0077] The above description provides a further detailed explanation of the embodiments of the present invention in conjunction with specific implementation methods. It should not be construed that the specific implementation of the present invention is limited to these descriptions. In the above embodiments, the connection relationships mentioned can be direct connections, and in some cases, indirect connections, such as those involving switches or relays. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A power supply circuit compatible with different input voltages, characterized in that, This includes the main power circuit and the switching power supply circuit; The main power circuit includes a bus capacitor circuit, which includes a first bus capacitor branch and a second bus capacitor branch. The first bus capacitor branch is connected in series between the positive and negative terminals of the DC bus through a first reserved branch. The second bus capacitor branch is connected in series between the positive and negative terminals of the DC bus through a second reserved branch. The first bus capacitor branch, the third reserved branch, and the second bus capacitor branch are sequentially connected in series between the positive and negative terminals of the DC bus. The series and parallel connection modes of the first bus capacitor branch and the second bus capacitor branch are switched by turning on at least one of the first reserved branch, the second reserved branch, and the third reserved branch. The switching power supply circuit includes a capacitor branch and a resistor branch connected to the output terminal of the rectifier circuit. The capacitor branch includes a reserved capacitor branch and a second capacitor branch connected in series. The resistor branch includes a reserved resistor branch and a second resistor branch connected in series. The reserved resistor branch and the reserved capacitor branch are connected in parallel. The second resistor branch and the second capacitor branch are connected in parallel.

2. The power supply circuit compatible with different input voltages as described in claim 1, characterized in that, The first reserved branch, the second reserved branch, and the third reserved branch include connection branches for setting conductive components; the bus capacitor circuit also includes a first voltage equalizing resistor branch and a first filter capacitor branch connected in parallel with the first bus capacitor branch, and a second voltage equalizing resistor branch and a second filter capacitor branch connected in parallel with the second bus capacitor branch.

3. The power supply circuit compatible with different input voltages as described in claim 2, characterized in that, When the input voltage is a first voltage value, the conductive element is provided on the connecting branch of the first reserved branch and the second reserved branch, the first bus capacitor and the second bus capacitor are respectively provided on the first bus capacitor branch and the second bus capacitor branch, and the first filter capacitor is provided on the first filter capacitor branch, so that the first bus capacitor branch and the second bus capacitor branch are connected in parallel.

4. The power supply circuit compatible with different input voltages as described in claim 2, characterized in that, When the input voltage is a first voltage value, the conductive element is provided on the connecting branch of the second reserved branch, a second bus capacitor is provided on the second bus capacitor branch, and a second filter capacitor is provided on the second filter capacitor branch to select the second bus capacitor branch; or the conductive element is provided on the connecting branch of the first reserved branch, a first bus capacitor is provided on the first bus capacitor branch, and a first filter capacitor is provided on the first filter capacitor branch to select the first bus capacitor branch.

5. The power supply circuit compatible with different input voltages as described in claim 2, characterized in that, When the input voltage is the second voltage value, the conductive element is installed on the connecting branch of the third reserved branch. A first bus capacitor and a second bus capacitor are respectively installed on the first bus capacitor branch and the second bus capacitor branch. A first voltage equalizing resistor is installed on the first voltage equalizing resistor branch and a second voltage equalizing resistor is installed on the second voltage equalizing resistor branch. A first filter capacitor is installed on the first filter capacitor branch and a second filter capacitor is installed on the second filter capacitor branch, so that the first bus capacitor branch and the second bus capacitor branch are connected in series.

6. The power supply circuit compatible with different input voltages as described in claim 1, characterized in that, The rectifier circuit is a rectifier bridge, and the reserved capacitor branch and the second capacitor branch are connected in series across the positive and negative output terminals of the rectifier bridge; the reserved resistor branch includes a connection branch for setting a current-limiting resistor, the second resistor branch includes a third current-limiting resistor and a fourth current-limiting resistor, and the reserved capacitor branch includes a connection branch for setting an energy storage capacitor.

7. The power supply circuit compatible with different input voltages as described in claim 6, characterized in that, When the input voltage is the first voltage value, a first current-limiting resistor and a second current-limiting resistor are connected in series on the reserved resistor branch. Both the first current-limiting resistor and the second current-limiting resistor are zero-ohm resistors, so that only the second capacitor branch is selected.

8. The power supply circuit compatible with different input voltages as described in claim 6, characterized in that, When the input voltage is the second voltage value, an energy storage capacitor is set on the connection branch of the reserved capacitor branch, and a first current-limiting resistor and a second current-limiting resistor are set in series on the reserved resistor branch. The resistance values ​​of the first current-limiting resistor and the second current-limiting resistor are the same as the resistance values ​​of the third current-limiting resistor and the fourth current-limiting resistor, so that the reserved capacitor branch is connected in series with the second capacitor branch.

9. A circuit board, characterized in that, Includes the power supply circuit compatible with different input voltages as described in any one of claims 1-8.

10. A motor controller, characterized in that, Includes the circuit board as described in claim 9.

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