Power conversion device, resource board card and test machine

Abstract

The utility model relates to a power supply conversion device, a resource board card and a test machine, the power supply conversion device comprises a resonant capacitor, a transformer and a conversion module, a primary winding of the transformer is connected with alternating current, the resonant capacitor is connected in series with the primary winding of the transformer, a secondary winding of the transformer is connected with the conversion module, and the voltage-reduced alternating current is output to the conversion module; the conversion module processes the alternating current after voltage reduction and then outputs the alternating current to a load; wherein the transformer is formed by winding a primary winding and a secondary winding in an isolated manner, and the distance between the primary winding and the secondary winding is widened, so that the parasitic capacitance is reduced, and the ripple noise is reduced. Meanwhile, the resonant capacitor is connected in series with the primary winding of the transformer, and the capacitive reactance of the resonant capacitor is utilized to resist the inductive reactance generated by leakage inductance elimination of the transformer, so that the output voltage is stabilized, and the output reliability is improved.

Description

Technical Field

[0001] The present application relates to the field of semiconductor testing technology, and in particular to a power conversion device, a resource board, and a tester. Background Art

[0002] Semiconductor automated testing refers to the use of automatic test equipment (ATE) to inspect various parameters of devices under test (DUTs), eliminating defective products and controlling the quality of semiconductors before they leave the factory. The tester's resource board must convert AC power to DC power for the load. Traditional power conversion circuits use transformers to step down the incoming AC power and output DC power to the load. However, due to the parasitic capacitance generated by the transformer, the output DC power will contain ripple noise, resulting in low output reliability. Utility Model Content

[0003] Based on this, it is necessary to provide a power conversion device, a resource board and a tester that can improve output reliability in order to address the above problems.

[0004] The first aspect of the present application provides a power conversion device, including a resonant capacitor, a transformer and a conversion module, wherein the primary winding of the transformer is connected to alternating current, the resonant capacitor is connected in series with the primary winding of the transformer, the secondary winding of the transformer is connected to the conversion module, and the stepped-down alternating current is output to the conversion module, and the conversion module outputs direct current to the load; wherein the transformer is a transformer with isolated primary and secondary windings.

[0005] In one embodiment, the conversion module includes a rectifier circuit connected to the secondary winding of the transformer and the load.

[0006] In one embodiment, the conversion module further includes a power amplification module, the rectifier circuit is connected to a power pin of the power amplification module, the output pin of the power amplification module is connected to the load, and the ground pin of the power amplification module is connected to a ground terminal.

[0007] In one embodiment, the conversion module further includes an energy storage capacitor, a first end of the energy storage capacitor is connected to the rectifier circuit and the power supply pin of the power amplifier module, and a second end of the energy storage capacitor is connected to the ground end.

[0008] In one embodiment, the rectifier circuit includes a diode D1, a diode D2, a diode D3 and a diode D4, the anode of the diode D1 and the anode of the diode D2 are both connected to the ground terminal, the cathode of the diode D1 and the anode of the diode D3 are both connected to the first end of the secondary winding, the cathode of the diode D2 and the anode of the diode D4 are both connected to the second end of the secondary winding, and the cathode of the diode D3 and the cathode of the diode D4 are both connected to the power pin of the power amplifier module.

[0009] A second aspect of the present application provides a resource board comprising the above-mentioned power conversion device.

[0010] In one embodiment, the number of the power conversion devices is more than two.

[0011] In one embodiment, each of the power conversion devices is connected in series in sequence, the conversion module of the power conversion device at the head end is connected to the first end of the load, the ground end of each power conversion device is connected to the conversion module of the next power conversion device, and the ground end of the power conversion device at the tail end is connected to the second end of the load.

[0012] In one embodiment, the conversion module includes a rectifier circuit, a power amplifier module, an energy storage capacitor and a control module, one end of the rectifier circuit is connected to the secondary winding of the transformer, the other end of the rectifier circuit is connected to the power pin of the power amplifier module, the ground pin of the power amplifier module is connected to the ground end, the control module is connected to the input pin of the power amplifier module, the first end of the energy storage capacitor is connected to the power pin of the rectifier circuit and the power amplifier module, and the second end of the energy storage capacitor is connected to the ground end; the ground end of the previous stage power conversion device is connected to the output pin of the power amplifier module of the next stage power conversion device, the output pin of the power amplifier module in the power conversion device at the head end is connected to the first end of the load, and the ground end of the power conversion device at the end end is connected to the second end of the load.

[0013] In one embodiment, the resource board further includes a power supply module, which is connected to the power conversion device and outputs AC power to the power conversion device.

[0014] A third aspect of the present application provides a testing machine, comprising the above-mentioned resource board.

[0015] The aforementioned power conversion device, resource board, and tester utilize a transformer designed with isolated primary and secondary windings, widening the distance between the primary and secondary windings to reduce parasitic capacitance and ripple noise. Furthermore, by connecting a resonant capacitor in series with the transformer's primary winding, the resonant capacitor's capacitive reactance offsets the inductive reactance generated by the transformer's leakage inductance, thereby stabilizing the output voltage and improving output reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural block diagram of a power conversion device in one embodiment;

[0017] Figure 2 Schematic diagram of winding of primary winding and secondary winding of a transformer in one embodiment;

[0018] Figure 3 is a circuit schematic diagram of a power conversion device in one embodiment;

[0019] Figure 4 is an equivalent circuit diagram of a power conversion device in one embodiment;

[0020] Figure 5 FIG. 1 is an equivalent circuit diagram of a plurality of power conversion devices connected in series in one embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0023] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0024] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, operations, components, parts, or combinations thereof.

[0025] In one embodiment, Figure 1As shown, a power conversion device 100 is provided, including a resonant capacitor C1, a transformer T1 and a conversion module 110. The primary winding of the transformer T1 is connected to the alternating current AC Vin, the resonant capacitor C1 is connected in series with the primary winding of the transformer T1, and the secondary winding of the transformer T1 is connected to the conversion module 110. The stepped-down alternating current is output to the conversion module 110, and the conversion module 110 outputs direct current to the load R1.

[0026] Among them, transformer T1 is a transformer with isolated primary winding and secondary winding. Figure 2 As shown, by changing the winding structure of the transformer T1, the primary winding and the secondary winding are wound separately and isolated, and the distance between the primary winding and the secondary winding is widened, the coupling capacitance between the primary winding and the secondary winding can be reduced, thereby achieving the effect of reducing common-mode noise. On this basis, a resonant capacitor C1 is also connected in series with the primary winding of the transformer T1, and the capacitive reactance of the resonant capacitor C1 is used to offset the inductive reactance generated by the leakage inductance of the transformer T1, thereby stabilizing the output voltage. After receiving the stepped-down AC power, the conversion module 110 can rectify the AC power and use the obtained DC power as an internal power supply, and then transmit the DC power to the load R1 for power supply according to the input signal; the conversion module 110 can also rectify the AC power and directly transmit the obtained DC power to the load R1 for power supply. The load R1 can be a controller or other device that needs power supply.

[0027] In one embodiment, conversion module 110 includes a rectifier circuit connected to the secondary winding of the transformer and load R1. The rectifier circuit rectifies the stepped-down AC power to generate DC power, which is then supplied to load R1. The rectifier circuit can be a full-bridge rectifier circuit or a half-bridge rectifier circuit. In this embodiment, rectifier circuit X1 is a full-bridge rectifier circuit.

[0028] Further, if Figure 3 As shown, the conversion module 110 includes a rectifier circuit X1 and a power amplifier module U1. The rectifier circuit X1 is connected to the power pin of the power amplifier module U1. The output pin of the power amplifier module U1 is connected to the load R1. The ground pin of the power amplifier module U1 is connected to the ground terminal GND. The rectifier circuit X1 may specifically include a diode D1, a diode D2, a diode D3, and a diode D4. The anode of the diode D1 and the anode of the diode D2 are both connected to the ground terminal. The cathode of the diode D1 and the anode of the diode D3 are both connected to the first end of the secondary winding. The cathode of the diode D2 and the anode of the diode D4 are both connected to the second end of the secondary winding. The cathode of the diode D3 and the cathode of the diode D4 are both connected to the power pin of the power amplifier module U1.

[0029] Rectifier circuit X1 outputs DC power to power amplifier module U1. Power amplifier module U1 regulates voltage based on the signal received at its input pin and outputs DC power V+ of the required voltage to power load R1, adapting to various power supply requirements. Conversion module 110 may also include a control module (not shown), which is connected to the input pin of power amplifier module U1 and outputs a signal to the input pin of power amplifier module U1.

[0030] In addition, the conversion module 110 may further include an energy storage capacitor C O , energy storage capacitor C O The first end is connected to the rectifier circuit X1 and the power pin of the power amplifier module U1, and the energy storage capacitor C O The second end of the load R1 is connected to the ground terminal GND. The first end of the load R1 is connected to the output pin of the power amplifier module U1, and the second end of the load R1 can also be connected to the ground terminal GND.

[0031] Figure 4 The figure shows the equivalent circuit diagram of the power conversion device 100. Ls is the leakage inductance generated by transformer T1, Csp is the parasitic capacitance between the transformer's secondary winding and the primary winding, and Cps is the parasitic capacitance between the transformer's primary winding and the secondary winding. AC Vin is the input alternating current. When transformer T1 steps down the voltage, the parasitic capacitance generated by the primary and secondary windings of transformer T1 transmits the oscillation of the AC input to the load R1, generating ripple noise at the same frequency as the AC Vin. By changing the winding structure of transformer T1 and increasing the distance between the primary and secondary windings of transformer T1, the capacitance of the parasitic capacitances Csp and Cps can be reduced. This widening of the distance between the primary and secondary windings of transformer T1 generates a larger leakage inductance, which is reflected in the circuit as a significant drop in the rectified output voltage as the load increases. Therefore, a resonant capacitor C1 is added to the primary winding of transformer T1. The capacitive reactance of the resonant capacitor C1 is used to offset the inductive reactance generated by the leakage inductance, thereby achieving a voltage stabilization effect on the output voltage of the rectifier circuit X1. The calculation formula for the resonant capacitor C1 and the parasitic inductance is as follows:

[0032]

[0033] For example, if the frequency of AC Vin is 40kHz and the leakage inductance Ls of the wound transformer T1 is 500uH, the resonant capacitor C1 is calculated to be 31.6nF. By consulting the capacitor manual, a capacitor with a capacitance of 30nF can be selected as the resonant capacitor C1.

[0034] In one embodiment, a resource board is further provided, comprising the aforementioned power conversion device 100. The number of power conversion devices 100 may be one or more. When there are two or more power conversion devices 100, each power conversion device 100 may operate independently to supply power to a corresponding load. Alternatively, the power conversion devices 100 may be connected in series to jointly supply power to a single load, thereby providing a sufficient power supply capability.

[0035] In one embodiment, each power conversion device 100 is connected in series, with the conversion module 110 of the power conversion device 100 at the head end connected to the first end of the load R1, the ground end of each power conversion device 100 connected to the conversion module of the next power conversion device 100, and the ground end of the power conversion device 100 at the tail end connected to the second end of the load R1. In this embodiment, the conversion module of the power conversion device 100 includes a rectifier circuit, a power amplifier module, a control module, and an energy storage capacitor. One end of the rectifier circuit is connected to the secondary winding of the transformer, the other end of the rectifier circuit is connected to the power pin of the power amplifier module, the ground pin of the power amplifier module is connected to the ground end, the control module is connected to the input pin of the power amplifier module, the first end of the energy storage capacitor is connected to the common end of the rectifier circuit and the power amplifier module, and the second end of the energy storage capacitor is connected to the ground end; the ground end of the previous power conversion device 100 is connected to the output pin of the power amplifier module of the next power conversion device 100, the output pin of the power amplifier module in the power conversion device 100 at the head end is connected to the first end of the load R1, and the ground end of the power conversion device 100 at the tail end is connected to the second end of the load R1. A plurality of power conversion devices 100 are connected in series in sequence to supply power to the load R1 . The output voltage waveform after the series connection will not be distorted due to cross-connection, thereby ensuring the reliability of power supply.

[0036] Specifically, if Figure 5 As shown, taking two power conversion devices 100 connected in series as an example, the first power conversion device 100 includes a resonant capacitor C1, a transformer T1, a rectifier circuit X1, a power amplifier module U1, an energy storage capacitor C O _1, the first control module (not shown in the figure), the second power conversion device 100 includes a resonant capacitor C2, a transformer T2, a rectifier circuit X2, a power amplifier module U2, an energy storage capacitor C O _2. A second control module (not shown in the figure): an output pin of the power amplifier module U1 in the first power conversion device 100 is connected to a first end of the load R1, a ground terminal GND1 is connected to an output pin of the power amplifier module U2 in the second power conversion device 100, and a second end of the load R1 is connected to a ground terminal GND in the second power conversion device 100.

[0037] In addition, the resource board also includes a power supply module, which is connected to the power conversion device 100 and outputs AC power to the power conversion device 100. The power supply module receives AC power and transmits it to the power conversion device 100, or generates AC power through energy conversion and transmits it to the power conversion device 100 for conversion into DC power to power the load R1.

[0038] In one embodiment, a testing machine is further provided, comprising the above-mentioned resource board.

[0039] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0040] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A power conversion device, characterized in that: It includes a resonant capacitor, a transformer and a conversion module. The primary winding of the transformer is connected to the AC power, the resonant capacitor is connected in series with the primary winding of the transformer, the secondary winding of the transformer is connected to the conversion module, and the stepped-down AC power is output to the conversion module. The conversion module outputs DC power to the load; wherein the transformer is a transformer with isolated primary and secondary windings.

2. The device according to claim 1, characterized in that The conversion module includes a rectifier circuit, and the rectifier circuit is connected to the secondary winding of the transformer and the load.

3. The device according to claim 2, characterized in that The conversion module further includes a power amplifier module, the rectifier circuit is connected to a power pin of the power amplifier module, the output pin of the power amplifier module is connected to the load, and the ground pin of the power amplifier module is connected to a ground terminal.

4. The device according to claim 3, characterized in that The conversion module further includes an energy storage capacitor, a first end of the energy storage capacitor is connected to the rectifier circuit and the power supply pin of the power amplifier module, and a second end of the energy storage capacitor is connected to the ground end.

5. The device according to claim 3, characterized in that The rectifier circuit includes a diode D1, a diode D2, a diode D3 and a diode D4, the anode of the diode D1 and the anode of the diode D2 are both connected to the ground terminal, the cathode of the diode D1 and the anode of the diode D3 are both connected to the first end of the secondary winding, the cathode of the diode D2 and the anode of the diode D4 are both connected to the second end of the secondary winding, and the cathode of the diode D3 and the cathode of the diode D4 are both connected to the power pin of the power amplifier module.

6. A resource board, characterized in that: A power conversion device comprising the power conversion device according to any one of claims 1 to 5.

7. The resource board according to claim 6, wherein: The number of the power conversion devices is more than two; each of the power conversion devices is connected in series in sequence, the conversion module of the power conversion device at the head end is connected to the first end of the load, the ground end of each power conversion device is connected to the conversion module of the next power conversion device, and the ground end of the power conversion device at the tail end is connected to the second end of the load.

8. The resource board according to claim 7, wherein: The conversion module includes a rectifier circuit, a power amplifier module, an energy storage capacitor and a control module. One end of the rectifier circuit is connected to the secondary winding of the transformer, the other end of the rectifier circuit is connected to the power pin of the power amplifier module, the ground pin of the power amplifier module is connected to the ground end, the control module is connected to the input pin of the power amplifier module, the first end of the energy storage capacitor is connected to the rectifier circuit and the power pin of the power amplifier module, and the second end of the energy storage capacitor is connected to the ground end; the ground end of the previous-stage power conversion device is connected to the output pin of the power amplifier module of the next-stage power conversion device, the output pin of the power amplifier module in the power conversion device at the head end is connected to the first end of the load, and the ground end of the power conversion device at the end end is connected to the second end of the load.

9. The resource board according to claim 6, wherein: It also includes a power supply module, which is connected to the power conversion device and outputs alternating current to the power conversion device.

10. A testing machine, characterized in that: The resource board comprises the resource board described in any one of claims 6 to 9.

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