Multi-stage voltage supply circuit, power supply device and test system

Abstract

This application relates to the field of hardware testing, and in particular to a multi-stage voltage power supply circuit, power supply equipment, and testing system. The circuit includes at least three voltage conversion modules, each sharing a single power supply terminal for inputting an initial voltage. Each voltage conversion module converts the initial voltage input to the power supply terminal into a regulated operating voltage and outputs the operating voltage at its corresponding output terminal. The operating voltages obtained by each voltage conversion module are unique, and none of the operating voltages exceed the initial voltage. Using this multi-stage voltage power supply circuit, multiple stable power supply voltages can be provided to the power supply board assembly.

Description

Technical Field

[0001] This application relates to the field of hardware testing, and in particular to a multi-level voltage power supply circuit, power supply equipment, and testing system. Background Technology

[0002] HIL (Hardware-in-the-loop) testing is a testing method that combines real hardware with real-time simulation models, and it is currently widely used in automotive testing. HIL testing typically uses an NI chassis and a test board set; the NI chassis is used to simulate automotive equipment or automotive electrical systems and can output corresponding status signals, while the test board set is used to transmit signals between the NI chassis and the automotive ECU (Hardware-in-the-loop Electronic Control Unit).

[0003] A typical test board set includes various functional boards, such as digital boards for digital signal processing, analog input / output boards for analog signal processing, and conditioning boards for signal conditioning; and these boards often require different power supply voltages.

[0004] How to provide multiple power supply voltages for the test board is an urgent problem to be solved. Utility Model Content

[0005] Therefore, it is necessary to provide a multi-level voltage power supply circuit, power supply equipment, and test system that can provide multiple power supply voltages for test board groups.

[0006] In a first aspect, this application provides a multi-stage voltage power supply circuit, which includes at least three voltage conversion modules, wherein:

[0007] Each of the voltage conversion modules shares a power supply terminal, which is used to input the initial voltage;

[0008] Each of the voltage conversion modules is used to convert the initial voltage input from the power supply terminal into a regulated output operating voltage, and output the operating voltage at the corresponding output terminal;

[0009] The operating voltages converted by each voltage conversion module are unique, and none of the operating voltages are higher than the initial voltage.

[0010] In one embodiment, among the voltage conversion modules, one of the voltage conversion modules converts the operating voltage to the initial voltage; wherein the initial voltage is 24V.

[0011] In one embodiment, each voltage conversion module includes a first voltage conversion module and a second voltage conversion module, wherein:

[0012] The first voltage conversion module is used to convert the initial voltage into a stable output first operating voltage; the first operating voltage is ±24V;

[0013] The second voltage conversion module is used to convert the initial voltage into the second operating voltage of the stable output; the second operating voltage is ±15V.

[0014] In one embodiment, each of the voltage conversion modules includes a third voltage conversion module and a fourth voltage conversion module, wherein:

[0015] The third voltage conversion module is used to convert the initial voltage into a stable output third operating voltage; the third operating voltage is 12V.

[0016] The fourth voltage conversion module is used to convert the initial voltage into a stable output fourth operating voltage, which is 5V.

[0017] In one embodiment, the first voltage conversion module and the second voltage conversion module are of a first type structure, which includes a pre-filter module, a voltage conversion chip, and two post-filter modules, wherein:

[0018] The input terminal of the pre-filter module is connected to the power supply terminal, and the output terminal is connected to the input terminal of the voltage conversion chip.

[0019] One of the post-filtering modules is connected to the positive output terminal and the ground terminal of the voltage conversion chip, and the other post-filtering module is connected to the negative output terminal and the ground terminal of the voltage conversion chip.

[0020] The voltage conversion chips in the first voltage conversion module and the second voltage conversion module are of different models.

[0021] In one embodiment, the third voltage conversion module and the fourth voltage conversion module are of a second type structure, which includes a pre-filter module, a voltage conversion chip, and a post-filter module, wherein:

[0022] The input terminal of the pre-filter module is connected to the power supply terminal, and the output terminal is connected to the input terminal of the voltage conversion chip.

[0023] The post-filter module is connected to the positive output terminal and the ground terminal of the voltage conversion chip.

[0024] In one embodiment, at least one of the voltage conversion modules is further connected to an indicator module, wherein:

[0025] The indicator module includes a light-emitting diode and a protection resistor;

[0026] The anode of the light-emitting diode is connected to the positive output terminal of the voltage conversion module, the cathode of the light-emitting diode is connected to one end of the protection resistor, and the other end of the protection resistor is grounded.

[0027] In one embodiment, the circuit further includes a protection module, wherein:

[0028] The protection module is connected to the power supply terminal and the input terminal of each of the voltage conversion modules;

[0029] The protection module is used to restrict the range of voltage and current input from the power supply terminal to each of the voltage conversion modules.

[0030] In a second aspect, this application provides a power supply device, which includes a carrier board and a multi-level voltage power supply circuit as described in any one of the first aspects above.

[0031] The modules in the multi-level voltage power supply circuit are integrated on the carrier board or connected to the carrier board via terminals.

[0032] Thirdly, this application provides a testing system, which includes a backplane, a digital processing board, an analog processing board, a fault injection board, and the power supply equipment described in the second aspect, wherein:

[0033] The backplane is used to connect the digital processing board, the analog processing board, the fault injection board, and the power supply equipment.

[0034] The power supply device is used to provide the corresponding operating voltage to the other boards through the wiring on the carrier board.

[0035] The aforementioned multi-level voltage power supply circuit, power supply equipment, and testing system distribute the input initial voltage to each voltage conversion module through the power supply terminal. Each conversion module converts the initial voltage to obtain different working voltages, and each working voltage obtained is a regulated output. This provides multi-level working voltages for the test board group, meeting the power requirements and stability of each test board in the test board group. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a simplified schematic diagram of a multi-stage voltage power supply circuit in one embodiment;

[0038] Figure 2 This is a structural diagram of the first type of structure in one embodiment;

[0039] Figure 3 This is a structural diagram of the second type of structure in one embodiment;

[0040] Figure 4 This is a schematic diagram of the structure of the indicator module in one embodiment;

[0041] Figure 5 This is a schematic diagram of the power supply equipment in one embodiment;

[0042] Figure 6 This is a schematic diagram of the test system in one embodiment. Detailed Implementation

[0043] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0045] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0046] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0047] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0048] When used herein, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0049] In one exemplary embodiment, such as Figure 1 As shown, this application provides a multi-level voltage power supply circuit, which includes at least three voltage conversion modules, wherein: each voltage conversion module shares a power supply terminal, which is used to input an initial voltage; each voltage conversion module is used to convert the initial voltage input by the power supply terminal into a regulated output working voltage, and outputs the working voltage at the corresponding output terminal; the working voltages converted by each voltage conversion module are not repeated, and each working voltage is not higher than the initial voltage.

[0050] Specifically, the power supply terminal is used to receive the initial voltage from an external input and distribute it to each voltage conversion module; the initial voltage can be either AC or DC. Since the operating voltage of each component and the signals processed in electronic circuits are all DC, if the initial voltage is AC, it needs to be converted to DC by an AC-to-DC module before being distributed to the respective voltage conversion modules. In the embodiments of this application, the initial voltage at the power supply terminal is DC, therefore, no further AC-to-DC conversion is required.

[0051] Furthermore, the operating voltages obtained by each voltage conversion module are different, and the operating voltage obtained by each voltage conversion module is no higher than the initial voltage. Each voltage conversion module can power at least one board in the test board group, or it can power multiple boards simultaneously. Each test board in the test board group can receive power from at least one voltage conversion module.

[0052] The aforementioned multi-level voltage power supply circuit can be applied to test board sets used for HIL testing, and can also be applied to other electronic devices or systems that require multi-voltage power supply. This application embodiment does not impose specific limitations on this.

[0053] In the above-mentioned multi-level voltage power supply circuit, the input initial voltage is distributed to each voltage conversion module through the power supply terminal. Each conversion module converts the initial voltage to obtain different working voltages, and each working voltage is a regulated output, thereby providing multi-level working voltages for the test board group and meeting the stable power requirements of each test board in the test board group.

[0054] In one embodiment, the multi-stage voltage power supply circuit includes four voltage conversion modules: a first voltage conversion module, a second voltage conversion module, a third voltage conversion module, and a fourth voltage conversion module. The initial voltage can be a 24V DC voltage, and one of the voltage conversion modules converts the voltage to the initial voltage. The multi-stage voltage power supply circuit also includes a protection module connected to the power supply terminal and the input terminals of each voltage conversion module. The protection module is used to clamp the range of voltage and current input from the power supply terminal to each voltage conversion module. The protection module simultaneously protects each stage of the voltage conversion module to reduce damage to downstream components caused by short circuits and / or large instantaneous currents. Further details on each voltage conversion module are provided below.

[0055] In one embodiment, reference Figure 2 , Figure 2 The diagram shows the structures of the first voltage conversion module and the second voltage conversion module. The first and second voltage conversion modules have the same structure, both being of the first type. The first structural type will be described in detail here. (Refer to...) Figure 2 The first structural type may specifically include a pre-filter module, a voltage conversion chip, and two post-filter modules, wherein: the input terminal of the pre-filter module is connected to the power supply terminal, and the output terminal is connected to the input terminal of the voltage conversion chip; one post-filter module is connected to the positive output terminal and the ground terminal of the voltage conversion chip, and the other post-filter module is connected to the negative output terminal and the ground terminal of the voltage conversion chip; the voltage conversion chips in the first voltage conversion module and the second voltage conversion module are of different models.

[0056] Specifically, refer to Figure 2 The pre-filter module includes a common-mode inductor LDM1, a differential-mode inductor LDM2, and four capacitors, E1 and E2, and C0 and C1, respectively. The first terminal of the differential-mode inductor LDM2 is connected to the positive input (+Vin) pin of the voltage conversion chip, and the second terminal is connected to the second terminal of the common-mode inductor LDM1. The first terminal of the common-mode inductor LDM1 is connected to the protection module. The third terminal of the common-mode inductor LDM1 is grounded, and the fourth terminal is connected to the negative input (-Vin) pin of the voltage conversion chip.

[0057] Capacitors E1 and E2 are both electrolytic capacitors; capacitors C0 and C1 are both ceramic capacitors. The first terminal of capacitor C1 is connected to the first terminal of differential mode inductor LDM2, and the second terminal of capacitor C1 is grounded; capacitor E2 is connected in parallel with capacitor C1. The first terminal of capacitor C0 is connected to the second terminal of differential mode inductor LDM2, and the second terminal of capacitor C0 is grounded; capacitor E1 is connected in parallel with capacitor C0.

[0058] Each post-filter module has the same structure. One post-filter module is used to filter the positive output (+V0) pin of the voltage conversion chip, and the other post-filter module is used to filter the negative output (-V0) pin.

[0059] Reference Figure 2 Taking one of the post-filtering modules as an example, this filter module includes three electrolytic capacitors and one inductor. The three electrolytic capacitors are capacitors C2, C3, and C4, and the inductor is LDM3. The first terminal of capacitor C2 is connected to the positive output (+V0) pin of the voltage conversion chip, and the second terminal is connected to the common connection (COM) pin of the voltage conversion chip. The common connection (COM) pin of the voltage conversion chip is connected in series with inductor LDM4 and then grounded. The first terminal of inductor LDM3 is connected to the positive output (+V0) pin of the voltage conversion chip, the first terminal of capacitor C3 is connected to the second terminal of inductor LDM3, and the second terminal of capacitor C3 is connected to the common connection (COM) pin of the voltage conversion chip. Capacitor C4 is connected in parallel with capacitor C3.

[0060] Another post-filter module includes three electrolytic capacitors and one inductor; the three electrolytic capacitors are capacitors C5, C6, and C7, and the inductor is LDM5; the first terminal of capacitor C5 is connected to the negative output (-V0) pin of the voltage conversion chip, and the second terminal is connected to the common connection (COM) pin of the voltage conversion chip; the first terminal of inductor LDM5 is connected to the negative output (-V0) pin of the voltage conversion chip, the first terminal of capacitor C6 is connected to the second terminal of inductor LDM5, and the second terminal of capacitor C6 is connected to the common connection (COM) pin of the voltage conversion chip; capacitor C7 is connected in parallel with capacitor C6.

[0061] In the voltage conversion module of the first type described above, the first voltage conversion module is used to convert the initial voltage into a stable output first operating voltage; the first operating voltage is ±24V; the second voltage conversion module is used to convert the initial voltage into a stable output second operating voltage; the second operating voltage is ±15V. Specifically, the voltage conversion chip in the first voltage conversion module is U1, whose model can be URB2424LD-30WR3; the voltage conversion chip in the second voltage conversion module is U2, whose model can be VRA2415LD-20WR3. The positive output pin of voltage conversion chip U1 outputs a regulated +24V voltage, and the negative output pin outputs a regulated -24V voltage. The positive output pin of voltage conversion chip U2 outputs a regulated +15V voltage, and the negative output pin outputs a regulated -15V voltage.

[0062] In one embodiment, reference Figure 3 , Figure 3 The diagram shows the structures of the third and fourth voltage conversion modules. The third and fourth voltage conversion modules have the same structure, both being of the second type. This section provides a detailed explanation of the second structural type. (Refer to...) Figure 3 The second type of structure includes a pre-filter module, a voltage conversion chip, and a post-filter module, wherein: the input terminal of the pre-filter module is connected to the power supply terminal, and the output terminal is connected to the input terminal of the voltage conversion chip; the post-filter module is connected to the positive output terminal and the ground terminal of the voltage conversion chip.

[0063] Specifically, such as Figure 3 As shown, the pre-filter module includes a common-mode inductor LDM1, a differential-mode inductor LDM2, and four capacitors, E1 and E2, and C0 and C1, respectively. The first terminal of the differential-mode inductor LDM2 is connected to the positive input (+Vin) pin of the voltage conversion chip, and the second terminal is connected to the second terminal of the common-mode inductor LDM1. The first terminal of the common-mode inductor LDM1 is connected to the protection module. The third terminal of the common-mode inductor LDM1 is grounded, and the fourth terminal is connected to the negative input (-Vin) pin of the voltage conversion chip.

[0064] Capacitors E1 and E2 are both electrolytic capacitors; capacitors C0 and C1 are both ceramic capacitors. The first terminal of capacitor C1 is connected to the first terminal of differential mode inductor LDM2, and the second terminal of capacitor C1 is grounded; capacitor E2 is connected in parallel with capacitor C1. The first terminal of capacitor C0 is connected to the second terminal of differential mode inductor LDM2, and the second terminal of capacitor C0 is grounded; capacitor E1 is connected in parallel with capacitor C0.

[0065] Reference Figure 3The post-filter module includes three electrolytic capacitors and two inductors. The three electrolytic capacitors are capacitors C2, C3, and C4, and the inductors are LDM3 and LDM4. The first terminal of capacitor C2 is connected to the positive output (+V0) pin of the voltage conversion chip, and the second terminal is connected to the ground (GND) pin of the voltage conversion chip. The ground terminal of the voltage conversion chip is connected to the first terminal of inductor LDM4, and the second terminal of inductor LDM4 is grounded. The first terminal of capacitor C3 is connected to the second terminal of inductor LDM3, and the second terminal of capacitor C3 is connected to the second terminal of inductor LDM4. Capacitor C4 is connected in parallel with capacitor C3.

[0066] In the voltage conversion module of the second type described above, the third voltage conversion module is used to convert the initial voltage into a stable output third operating voltage; the third operating voltage is 12V; the fourth voltage conversion module is used to convert the initial voltage into a stable output fourth operating voltage, the fourth operating voltage is 5V. Specifically, the voltage conversion chip in the third voltage conversion module is U3, whose model can be VRA2412LD-20WR3; the voltage conversion chip in the second voltage conversion module is U4, whose model can be VRB2405LD-20WR3. The positive output pin of voltage conversion chip U3 outputs a regulated +12V DC voltage, and the positive output pin of voltage conversion chip U4 outputs a regulated +5V DC voltage.

[0067] It should be emphasized that the presence of the same component symbols in the voltage conversion modules of the first and second types of structures does not indicate that the same component is connected in both types of structures. The same component symbols only indicate that the types of components in the two types of structures are consistent, which will not be elaborated on further here.

[0068] Furthermore, such as Figure 2 and Figure 3 As shown, the protection module includes a fuse FUSE and a varistor MOV; wherein, the first terminal of the fuse FUSE is connected to the external initial voltage, and the second terminal is connected to the first terminal of the common mode inductor LDM1 of the pre-filter module in each voltage conversion module; the first terminal of the varistor MOV is connected to the second terminal of the fuse FUSE, and the second terminal of the varistor MOV is connected to the third terminal of the common mode inductor LDM1 of the pre-filter module in each voltage conversion module.

[0069] A varistor is a resistor with nonlinear voltage-current characteristics. It can clamp the voltage when the circuit is subjected to overvoltage and absorb excess current to protect sensitive devices. A fuse can melt when subjected to a large current to open the circuit, thereby protecting downstream components.

[0070] In one embodiment, reference Figure 4At least one voltage conversion module's output is also connected to an indicator module, wherein: the indicator module includes a light-emitting diode D1 and a protective resistor R0; the anode of the light-emitting diode D1 is connected to the positive output pin (+V0) of the voltage conversion module, the cathode of the light-emitting diode D1 is connected to one end of the protective resistor R0, and the other end of the protective resistor R0 is grounded. In one possible example, the outputs of the third and fourth voltage conversion modules in this application are each connected to an indicator module.

[0071] It is understood that the voltage conversion chips in the voltage conversion modules described above can also be other models, not limited to those mentioned in the above embodiments, as long as they can achieve the voltage conversion function of their corresponding voltage conversion modules.

[0072] In one exemplary embodiment, refer to Figure 5 A power supply device is provided, which includes a carrier board and a multi-level voltage power supply circuit as described in the above-described multi-level voltage power supply circuit embodiment; and each module in the multi-level voltage power supply circuit is integrated on the carrier board or connected to the carrier board by means of terminal connection.

[0073] In one exemplary embodiment, refer to Figure 6 Furthermore, a testing system is provided, comprising a backplane, digital processing boards, analog processing boards, fault injection boards, and a power supply device as described in the above power supply device embodiment, wherein: the backplane is used to connect the digital processing boards, analog processing boards, fault injection boards, and the power supply device; and the power supply device is used to provide corresponding operating voltages to the other boards through wiring on the carrier board.

[0074] In the description of this specification, references to terms such as "some embodiments," "other embodiments," 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 descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A multi-level voltage supply circuit, characterized by The power supply circuit includes at least three voltage conversion modules, wherein: Each of the voltage conversion modules shares a power supply terminal, which is used to input the initial voltage; Each of the voltage conversion modules is used to convert the initial voltage input from the power supply terminal into a regulated output operating voltage, and output the operating voltage at the corresponding output terminal; The operating voltages converted by each voltage conversion module are unique, and none of the operating voltages are higher than the initial voltage.

2. The multi-level voltage supply circuit of claim 1, wherein, In each of the voltage conversion modules, one of the voltage conversion modules converts the operating voltage to the initial voltage; wherein the initial voltage is 24V.

3. The multi-level voltage supply circuit of claim 2, wherein, Each of the voltage conversion modules includes a first voltage conversion module and a second voltage conversion module, wherein: The first voltage conversion module is used to convert the initial voltage into a stable output first operating voltage; the first operating voltage is ±24V; The second voltage conversion module is used to convert the initial voltage into the second operating voltage of the stable output; the second operating voltage is ±15V.

4. The multi-level voltage supply circuit of claim 2, wherein, Each of the voltage conversion modules includes a third voltage conversion module and a fourth voltage conversion module, wherein: The third voltage conversion module is used to convert the initial voltage into a stable output third operating voltage; the third operating voltage is 12V. The fourth voltage conversion module is used to convert the initial voltage into a stable output fourth operating voltage, which is 5V.

5. The multi-level voltage supply circuit of claim 3, wherein, The first voltage conversion module and the second voltage conversion module are of a first type structure, which includes a pre-filter module, a voltage conversion chip, and two post-filter modules, wherein: The input terminal of the pre-filter module is connected to the power supply terminal, and the output terminal is connected to the input terminal of the voltage conversion chip. One of the post-filtering modules is connected to the positive output terminal and the ground terminal of the voltage conversion chip, and the other post-filtering module is connected to the negative output terminal and the ground terminal of the voltage conversion chip. The voltage conversion chips in the first voltage conversion module and the second voltage conversion module are of different models.

6. The multi-level voltage supply circuit of claim 4, wherein, The third and fourth voltage conversion modules are of the second type of structure, which includes a pre-filter module, a voltage conversion chip, and a post-filter module, wherein: The input terminal of the pre-filter module is connected to the power supply terminal, and the output terminal is connected to the input terminal of the voltage conversion chip. The post-filter module is connected to the positive output terminal and the ground terminal of the voltage conversion chip.

7. The multi-level voltage supply circuit according to any of claims 1-6, characterized by, At least one of the voltage conversion modules is further connected to an indicator module at its output, wherein: The indicator module includes a light-emitting diode and a protection resistor; The anode of the light-emitting diode is connected to the positive output terminal of the voltage conversion module, the cathode of the light-emitting diode is connected to one end of the protection resistor, and the other end of the protection resistor is grounded.

8. The multi-level voltage supply circuit of any of claims 1-6, wherein, The circuit also includes a protection module, wherein: The protection module is connected to the power supply terminal and the input terminal of each of the voltage conversion modules; The protection module is used to restrict the range of voltage and current input from the power supply terminal to each of the voltage conversion modules.

9. A power supply device, characterized by comprising: The power supply device includes a carrier board and a multi-stage voltage power supply circuit as described in any one of claims 1-8 above; The modules in the multi-level voltage power supply circuit are integrated on the carrier board or connected to the carrier board via terminals.

10. A test system, characterized by The test system includes a backplane, digital processing boards, analog processing boards, fault injection boards, and the power supply equipment as described in claim 9, wherein: The backplane is used to connect the digital processing board, the analog processing board, the fault injection board, and the power supply equipment. The power supply device is used to provide the corresponding operating voltage to the other boards through the wiring on the carrier board.

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