Power inductance test circuit and system
By designing a power inductor testing circuit including an adjustable DC power module, a boost module and a step-down module, the problem of high-power power supply in power inductor testing is solved, and a small-power power supply can perform large current and different voltage testing is achieved, which is energy-saving and low-cost.
Patent Information
- Application Number
- CN202421657661.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-12
AI Technical Summary
In the power electronics industry, the power test of power inductors requires temperature rise tests under high voltage, large current and different voltages and currents. It usually requires a high power supply, resulting in high costs and high power consumption.
A power inductance testing circuit is designed, including an adjustable DC power module, a boost module, a step-down module, a capacitor and a control module. The input voltage is set by the adjustable DC power module, the boost module changes the current on the inductor, and the buck module realizes energy feedback. Only a small-power input power supply can be used to achieve tests of large currents and different voltages.
It realizes that high current and different voltage testing is not required for power inductor testing, and is energy-saving and low-cost.
Smart Images
Figure CN222882765U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power electronics, to a power inductor, and in particular to a power inductor test, in particular to a power inductor test circuit and system. Background Art
[0002] In the power electronics industry, power inductors are widely used. They can be used together with power tubes to achieve a variety of voltage conversions.
[0003] To achieve power testing of power inductors, high voltage, large current, and temperature rise under different voltages and currents are required. This often requires a high-power power supply, which is costly and results in high power consumption. Utility Model Content
[0004] The purpose of the utility model is to provide a power inductor testing circuit and system, which are used to solve the problems pointed out in the above background technology.
[0005] In a first aspect, the utility model provides a power inductor test circuit, which is used for power testing of a first inductor to be tested, and the power inductor test circuit comprises: an adjustable DC power supply module, a boost module, a buck module, a capacitor and a control module; wherein, the first end of the adjustable DC power supply module is connected to the first end of the buck module, and is used to be commonly connected to one end of the first inductor; the first end of the boost module is used to be connected to the other end of the first inductor, the second end of the boost module and the second end of the buck module are both connected to the control module, the third end of the boost module is connected to the third end of the buck module and one end of the capacitor, and are commonly connected to the second end of the adjustable DC power supply module, and the fourth end of the boost module is connected to the fourth end of the buck module, and are commonly connected to the other end of the capacitor.
[0006] In the utility model, the input voltage of the first inductor to be tested is set by an adjustable DC power supply module, the current change on the first inductor is realized by a boost module, and the output current is connected back to the input end of the first inductor by a buck module to realize energy feedback. Therefore, when the power test of the first inductor is performed, only a power supply with general power is needed to realize the large current test on the first inductor and the test of different voltages, which has the characteristics of energy saving and low cost.
[0007] In an implementation of the first aspect, the boost module includes: a first diode and a first MOS transistor; wherein an anode of the first diode is connected to a drain of the first MOS transistor and together serves as a first end of the boost module, which is used to be connected to the other end of the first inductor; a gate of the first MOS transistor serves as a second end of the boost module, which is connected to the control module; a source of the first MOS transistor serves as a third end of the boost module, which is connected to a third end of the buck module and one end of the capacitor; and a cathode of the first diode serves as a fourth end of the boost module, which is connected to a fourth end of the buck module.
[0008] In an implementation manner of the first aspect, the step-down module includes: a second diode, a second MOS transistor and a second inductor; wherein one end of the second inductor serves as the first end of the step-down module and is connected to the first end of the adjustable DC power supply module, and the other end of the second inductor is respectively connected to the cathode of the second diode and the source of the second MOS transistor; the gate of the second MOS transistor serves as the second end of the step-down module and is connected to the control module; the anode of the second diode serves as the third end of the step-down module and is connected to the third end of the boost module and one end of the capacitor; and the drain of the second MOS transistor serves as the fourth end of the step-down module and is connected to the fourth end of the boost module.
[0009] In an implementation of the first aspect, the power inductor test circuit further includes: a power grid; the power grid is connected to the adjustable DC power supply module; the adjustable DC power supply module is used to convert the three-phase AC power of the power grid into adjustable DC power.
[0010] In an implementation of the first aspect, the control module adopts an MCU.
[0011] In a second aspect, the utility model provides a power inductor testing system, the power inductor testing system comprising: a first inductor to be tested and the above-mentioned power inductor testing circuit; wherein the power inductor testing circuit is connected to the first inductor.
[0012] As described above, the power inductor test circuit and system described in the utility model have the following beneficial effects:
[0013] Compared with the prior art, the power inductor test circuit and system provided by the utility model set the input voltage of the first inductor to be tested through an adjustable DC power supply module, realize the current change on the first inductor through a boost module, and connect the output current back to the input end of the first inductor through a buck module to realize energy feedback, so that when the power test of the first inductor is performed, a high-power power supply is not required, and a large-current test of the inductor and a test of different voltages and currents can be realized. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 Shown is a schematic diagram of a power inductor testing circuit according to an embodiment of the utility model.
[0015] Figure 2 Shown is a circuit diagram of a power inductor testing circuit according to an embodiment of the present utility model. DETAILED DESCRIPTION
[0016] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.
[0017] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0018] See also Figure 1 and Figure 2 The following embodiments of the utility model provide a power inductor test circuit and system. Compared with the prior art, the power inductor test circuit and system provided by the utility model set the input voltage of the first inductor to be tested through an adjustable DC power supply module, realize the current change on the first inductor through a boost module, and connect the output current back to the input end of the first inductor through a buck module to realize energy feedback, so that when the power test of the first inductor is performed, a high-power power supply is not required, and a large-current test of the inductor and a test of different voltages and currents can be realized.
[0019] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0020] like Figure 1 As shown, in one embodiment, the utility model provides a power inductor test circuit, which is used for power testing of a first inductor L1 to be tested (the first inductor L1 is a power inductor), and the power inductor test circuit includes: an adjustable DC power supply module 11, a boost module 12, a buck module 13, a capacitor C and a control module 14.
[0021] Specifically, the first end ① of the adjustable DC power supply module 11 is connected to the first end ① of the step-down module 13, and is used to be commonly connected to one end of the first inductor L1; the first end ① of the boost module 12 is used to be connected to the other end of the first inductor L1, the second end ② of the boost module 12 and the second end ② of the step-down module 13 are both connected to the control module 14, the third end ③ of the boost module 12 is connected to the third end ③ of the step-down module 13, and one end of the capacitor C, and are commonly connected to the second end ② of the adjustable DC power supply module 11 (corresponding to Figure 2 The “-” end of the adjustable DC power supply module 11), the fourth end ④ of the boost module 12 is connected to the fourth end ④ of the buck module 13, and are commonly connected to the other end of the capacitor C.
[0022] It should be noted that the adjustable DC power supply module 11 is used to input adjustable DC power to the first inductor L1. The DC input voltage of the adjustable DC power supply module 11 and the boost voltage value of the boost module 12 are set to realize the change of the current on the first inductor L1. The output current is connected back to the input end of the first inductor L1 through the buck module 13 to realize energy feedback. When the utility model performs power testing on the first inductor L1, only a general power high-voltage power supply is required. The first inductor L1 is used as the energy storage inductor of the boost power supply, and then a step-down is added at the back to control the buck voltage value so that the boost input is mainly based on the buck output voltage, thereby returning the current to the inductor input end, realizing large current testing of the inductor and testing of different voltages and currents.
[0023] like Figure 1 and Figure 2 As shown, in one embodiment, the boost module 12 includes: a first diode D1 and a first MOS transistor T1.
[0024] Specifically, the anode of the first diode D1 is connected to the drain of the first MOS transistor T1, and together serve as the first end ① of the boost module 12, which is used to be connected to the other end of the first inductor L1; the gate of the first MOS transistor T1 serves as the second end ② of the boost module 12, which is connected to the control module 14 (the switch of the first MOS transistor T1 is controlled by the control module 14), and the source of the first MOS transistor T1 serves as the third end ③ of the boost module 12, which is connected to the third end ③ of the buck module 13 and one end of the capacitor C; the cathode of the first diode D1 serves as the fourth end ④ of the boost module 12, which is connected to the fourth end ④ of the buck module 13.
[0025] like Figure 1 and Figure 2 As shown, in one embodiment, the voltage reduction module 13 includes: a second diode D2, a second MOS transistor T2 and a second inductor L2.
[0026] Specifically, one end of the second inductor L2 serves as the first end ① of the step-down module 13 and is connected to the first end ① of the adjustable DC power supply module 11 (corresponding to Figure 2 The second inductor L2 is connected to the “+” end of the adjustable DC power supply module 11 in the middle), the other end of the second inductor L2 is respectively connected to the cathode of the second diode D2 and the source of the second MOS tube T2; the gate of the second MOS tube T2 serves as the second end ② of the step-down module 13, and is connected to the control module 14 (the switch of the second MOS tube T2 is controlled by the control module 14); the anode of the second diode D2 serves as the third end ③ of the step-down module 13, and is connected to the third end ③ of the boost module 12, and one end of the capacitor C; the drain of the second MOS tube T2 serves as the fourth end ④ of the step-down module 13, and is connected to the fourth end ④ of the boost module 12.
[0027] like Figure 1 and Figure 2 As shown, in one embodiment, the power inductor test circuit further includes: a power grid 15 .
[0028] Specifically, the power grid 15 is connected to the adjustable DC power module 11; the adjustable DC power module 11 is used to convert the three-phase AC power of the power grid 15 into adjustable DC power.
[0029] It should be noted that the specific working principle of the adjustable DC power supply module 11 adopts the existing technical means in this field, so it will not be described in detail here.
[0030] like Figure 1 and Figure 2 As shown, in one embodiment, the control module 14 adopts MCU.
[0031] Specifically, the adjustable DC power supply module 11 converts the three-phase AC power of the power grid 15 into adjustable DC power. The voltage of the input first inductor L1 is set by the adjustable DC power supply module 11. The first diode D1 and the first MOS tube T1 form a boost module 12. The MCU controls the switch of the first MOS tube T1 to make the output voltage reach the setting, thereby generating the current required for the test on the first inductor L1; the second inductor L2, the second diode D2, and the second MOS tube T2 form a buck module 13. The MCU controls the switch of the second MOS tube T2 to control the buck voltage value, so that the boost input is mainly buck output, forming current feedback.
[0032] It should be noted that the power inductor test circuit provided by the utility model only needs a low-power input power supply to implement a high-power inductor test with variable voltage and current when performing a power test on the first inductor to be tested; and it has the characteristic of energy saving by recycling the current.
[0033] The utility model also provides a power inductor testing system, which comprises: a first inductor to be tested and the power inductor testing circuit mentioned above.
[0034] Specifically, the power inductor testing circuit is connected to the first inductor.
[0035] It should be noted that the working principle of the power inductor test system is: power test is performed on the first inductor through the power inductor test circuit. The specific working principle can be referred to the above introduction to the power inductor test circuit, so it will not be described in detail here.
[0036] The descriptions of the processes or structures corresponding to the above-mentioned figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.
[0037] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.
Claims
1. A power inductor test circuit, used for power testing of a first inductor to be tested, characterized in that: The power inductor test circuit includes: an adjustable DC power supply module, a boost module, a buck module, a capacitor and a control module; wherein, The first end of the adjustable DC power supply module is connected to the first end of the step-down module, and is used to be commonly connected to one end of the first inductor; The first end of the boost module is used to be connected to the other end of the first inductor, the second end of the boost module and the second end of the buck module are both connected to the control module, the third end of the boost module is connected to the third end of the buck module and one end of the capacitor, and are commonly connected to the second end of the adjustable DC power supply module, and the fourth end of the boost module is connected to the fourth end of the buck module, and are commonly connected to the other end of the capacitor.
2. The power inductor test circuit according to claim 1, characterized in that: The boost module includes: a first diode and a first MOS tube; wherein, The anode of the first diode is connected to the drain of the first MOS tube, and together serve as the first end of the boost module, and are used to be connected to the other end of the first inductor; The gate of the first MOS tube serves as the second end of the boost module and is connected to the control module; the source of the first MOS tube serves as the third end of the boost module and is connected to the third end of the buck module and one end of the capacitor; The cathode of the first diode serves as the fourth end of the boost module and is connected to the fourth end of the buck module.
3. The power inductor test circuit according to claim 1 or 2, characterized in that: The step-down module includes: a second diode, a second MOS tube and a second inductor; wherein, One end of the second inductor serves as the first end of the step-down module and is connected to the first end of the adjustable DC power supply module, and the other end of the second inductor is respectively connected to the cathode of the second diode and the source of the second MOS tube; The gate of the second MOS tube serves as the second end of the buck module and is connected to the control module; The anode of the second diode serves as the third end of the buck module, connected to the third end of the boost module and one end of the capacitor; The drain of the second MOS tube serves as the fourth end of the buck module and is connected to the fourth end of the boost module.
4. The power inductor test circuit according to claim 1, characterized in that: The power inductor test circuit also includes: a power grid; The power grid is connected to the adjustable DC power supply module; the adjustable DC power supply module is used to convert the three-phase AC power of the power grid into adjustable DC power.
5. The power inductor test circuit according to claim 1, characterized in that: The control module adopts MCU.
6. A power inductor testing system, characterized in that: The power inductor test system comprises: a first inductor to be tested and a power inductor test circuit according to any one of claims 1 to 5; wherein: The power inductor testing circuit is connected to the first inductor.