Power supply system for electromagnetic compatibility test of integrated circuit

Abstract

The utility model relates to the technical field of power supply systems, in particular to a power supply system for an integrated circuit electromagnetic compatibility test, which comprises a front step-down module, a rear step-down module, a master control module and a filter module, the front step-down module, the rear step-down module and the filter module are electrically connected in sequence, the front step-down module is used for rectification and step-down, and the master control module is used for controlling the master control module. The main control module obtains the output current of the rear step-down module and outputs a PWM signal to control the output voltage of the rear step-down module, and the filtering module is used for filtering interference signals. According to the utility model, the front step-down module carries out preliminary step-down, and then the rear step-down module carries out accurate control, so that the rear step-down module can output different voltages, the applicability is improved, interference signals are filtered through the filtering module, the influence on subsequent circuits is avoided, and the practicability is stronger.

Description

TECHNICAL FIELD

[0001] The utility model relates to power system technical field, specifically, relate to a power system for integrated circuit electromagnetic compatibility test. BACKGROUND

[0002] With the rapid development of integrated circuit technology, electronic products are more and more widely used in various fields, integrated circuit as the core component of electronic products, its performance and reliability directly affect the quality of the whole electronic product, in the design, production and application process of integrated circuit, electromagnetic compatibility problem is increasingly concerned.

[0003] Electromagnetic compatibility refers to the ability of electronic equipment to work normally in electromagnetic environment and not to constitute the electromagnetic disturbance that cannot be borne by any thing in the environment, for integrated circuit, electromagnetic compatibility test is an important link to ensure its stable and reliable operation in practical application.

[0004] In integrated circuit electromagnetic compatibility test, power system plays a vital role, stable, reliable, low noise power supply is the key to ensure the accuracy and reliability of test results, traditional power system has some deficiencies in meeting the requirements of integrated circuit electromagnetic compatibility test, the power noise is larger, and may interfere with the test results, therefore, a power system for integrated circuit electromagnetic compatibility test is needed. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a power system for integrated circuit electromagnetic compatibility test to solve the problems in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A power system for integrated circuit electromagnetic compatibility test, comprising pre-depression module, post-depression module, main control module and filter module, the pre-depression module, the post-depression module and the filter module are electrically connected in turn, the pre-depression module is used for rectification and voltage reduction, the main control module obtains the output current of the post-depression module and outputs PWM signal to control the output voltage of the post-depression module, and the filter module is used for filtering interference signal.

[0008] As preferred, the pre-depression module comprises 220V mains, primary coil, secondary coil, rectifier bridge and capacitor C1;

[0009] The two ends of the primary coil are connected with the firewire and zero line of 220V mains respectively, the two ends of the secondary coil are connected with the two input ends of the rectifier bridge respectively, the two ends of the capacitor C1 are connected with the two output ends of the rectifier bridge respectively, the second end of the capacitor C1 is connected with the ground, and the two ends of the capacitor C1 are used as the output end of the pre-depression module.

[0010] As preferred, the post-positioned voltage reduction module comprises NMOS tube, diode D, inductor L1, capacitor C2, resistor R1, resistor R2, resistor R3, resistor R4 and operational amplifier;

[0011] The source of the NMOS tube and the negative electrode of the diode D are used as the input end of the post-positioned voltage reduction module, the output port of the main control module is connected with the gate of the NMOS tube, the drain of the NMOS tube is connected with the positive electrode of the diode D, the first end of the inductor L1 is connected with the negative electrode of the diode D, the second end of the inductor L1 is connected with the first end of the capacitor C2, the second end of the capacitor C2 is connected with the positive electrode of the diode D, and the two ends of the capacitor C2 are used as the output end of the post-positioned voltage reduction module;

[0012] The first end of the resistor R1 is connected with the non-inverting input end of the operational amplifier, the second end of the resistor R1 is connected with the first end of the capacitor C2, the output end of the operational amplifier is connected with the input port of the main control module, the first end of the resistor R4 is connected with the ground, the second end of the resistor R4 is connected with the first end of the resistor R1, the first end of the resistor R2 is connected with the inverting input end of the operational amplifier, the second end of the resistor R2 is connected with the second end of the capacitor C2, the first end of the resistor R3 is connected with the output end of the operational amplifier, and the second end of the resistor R3 is connected with the first end of the resistor R2.

[0013] As preferred, the filter module comprises capacitor C3, inductor L2, capacitor C4, capacitor C5 and capacitor C6;

[0014] The two ends of the capacitor C3 are used as the input end of the filter module, the first end of the inductor L2 is connected with the first end of the capacitor C3, the second end of the inductor L2 is connected with the second end of the capacitor C3, the first end of the capacitor C4 is connected with the third end of the inductor L2, the second end of the capacitor C4 is connected with the fourth end of the inductor L2, the first end of the capacitor C5 is connected with the first end of the capacitor C4, the second end of the capacitor C5 is connected with the ground, the first end of the capacitor C6 is connected with the ground, the second end of the capacitor C6 is connected with the second end of the capacitor C4, and the two ends of the capacitor C4 are used as the output end of the filter module.

[0015] As preferred, the inductor L2 is a differential mode inductor, the capacitor C3 and the capacitor C4 are differential mode capacitors, and the capacitor C5 and the capacitor C6 are common mode capacitors.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] The utility model discloses a preliminary voltage reduction is carried out through setting the front-positioned voltage reduction module, then accurate control is carried out through the post-positioned voltage reduction module, makes the post-positioned voltage reduction module can output different voltage, improves the applicability, and through the filter module, the interference signal is filtered out, avoids the influence to the subsequent circuit, and the practicality is stronger. ACCURACY

[0018] Figure 1 It is the whole structure schematic diagram of the utility model;

[0019] Figure 2The circuit diagram of the front-stage voltage reduction module in the utility model;

[0020] Figure 3 The circuit diagram of the rear-stage voltage reduction module in the utility model;

[0021] Figure 4 The circuit diagram of the filter module in the utility model;

[0022] In the drawings:

[0023] 1. The front-stage voltage reduction module;

[0024] 2. The rear-stage voltage reduction module;

[0025] 3. The main control module;

[0026] 4. The filter module. DETAILED DESCRIPTION

[0027] The technical solutions in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Apparently, the described embodiments are only some of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] Please refer to Figures 1-4 The utility model provides technical solutions:

[0029] A power supply system for integrated circuit electromagnetic compatibility test, comprising a front-stage voltage reduction module 1, a rear-stage voltage reduction module 2, a main control module 3 and a filter module 4, the front-stage voltage reduction module 1, the rear-stage voltage reduction module 2 and the filter module 4 are electrically connected in sequence, the front-stage voltage reduction module 1 is used for rectification and voltage reduction, the main control module 3 obtains the output current of the rear-stage voltage reduction module 2 and outputs a PWM signal to control the output voltage of the rear-stage voltage reduction module 2, different voltage values can be obtained, different test requirements are met, the filter module 4 is used for filtering interference signals, mainly high-frequency clutter, and the main control module 3 can use common single-chip microcomputer series.

[0030] In the embodiment, the front-stage voltage reduction module 1 comprises 220V mains, a primary coil, a secondary coil, a rectifier bridge and a capacitor C1, the primary coil and the secondary coil constitute a voltage reduction circuit, the rectifier bridge is a full-bridge rectifier circuit, and the capacitor C1 is a filter capacitor.

[0031] Two ends of the primary coil are connected with a live wire and a zero wire of the 220V mains respectively, two ends of the secondary coil are connected with two input ends of the rectifier bridge respectively, two ends of the capacitor C1 are connected with two output ends of the rectifier bridge respectively, a second end of the capacitor C1 is connected with the ground, and the two ends of the capacitor C1 serve as output ends of the front-stage voltage reduction module 1.

[0032] Specifically, the post voltage reduction module 2 includes an NMOS tube, a diode D, an inductor L1, a capacitor C2, resistors R1, R2, R3, R4 and an operational amplifier, different voltages are obtained by switching of the NMOS tube, and the operational amplifier constitutes a sampling circuit;

[0033] The source of the NMOS tube and the negative electrode of the diode D are input terminals of the post voltage reduction module 2, the output port of the main control module 3 is connected to the gate of the NMOS tube, the drain of the NMOS tube is connected to the positive electrode of the diode D, the first end of the inductor L1 is connected to the negative electrode of the diode D, the second end of the inductor L1 is connected to the first end of the capacitor C2, the second end of the capacitor C2 is connected to the positive electrode of the diode D, and the two ends of the capacitor C2 are output terminals of the post voltage reduction module 2;

[0034] The first end of the resistor R1 is connected to the non-inverting input terminal of the operational amplifier, the second end of the resistor R1 is connected to the first end of the capacitor C2, the output terminal of the operational amplifier is connected to the input port of the main control module 3, the input port of the main control module 3 needs to have an analog-to-digital conversion function, the first end of the resistor R4 is connected to the ground, the second end of the resistor R4 is connected to the first end of the resistor R1, the first end of the resistor R2 is connected to the inverting input terminal of the operational amplifier, the second end of the resistor R2 is connected to the second end of the capacitor C2, the first end of the resistor R3 is connected to the output terminal of the operational amplifier, and the second end of the resistor R3 is connected to the first end of the resistor R2.

[0035] Further, the filter module 4 includes a capacitor C3, an inductor L2, a capacitor C4, a capacitor C5 and a capacitor C6, and the filter module 4 is an EMI filter circuit;

[0036] The two ends of the capacitor C3 are input terminals of the filter module 4, the first end of the inductor L2 is connected to the first end of the capacitor C3, the second end of the inductor L2 is connected to the second end of the capacitor C3, the first end of the capacitor C4 is connected to the third end of the inductor L2, the second end of the capacitor C4 is connected to the fourth end of the inductor L2, the first end of the capacitor C5 is connected to the first end of the capacitor C4, the second end of the capacitor C5 is connected to the ground, the first end of the capacitor C6 is connected to the ground, the second end of the capacitor C6 is connected to the second end of the capacitor C4, and the two ends of the capacitor C4 are output terminals of the filter module 4.

[0037] In addition, the inductor L2 is a differential mode inductor, the capacitor C3 and the capacitor C4 are differential mode capacitors, the capacitor C5 and the capacitor C6 are common mode capacitors, and a resistor can also be connected in parallel to the two ends of the capacitor C3 and the capacitor C4 to discharge.

[0038] The power supply system for integrated circuit electromagnetic compatibility test of the utility model in use, through the preliminary voltage reduction and shaping of the voltage reduction circuit and rectifier circuit in the front end voltage reduction module 1, the switch of NMOS pipe is controlled by the output PWM signal of main control module 3 to obtain different voltage, the current value is sampled by operational amplifier, the current value of sampling is obtained by main control module 3 to accurately control, and then the voltage value obtained is more accurate, finally the high frequency signal is filtered out by filter module 4, when high frequency interference passes through filter module 4, common mode inductance and differential mode inductance make high frequency interference convert into heat energy or flow out from bypass, thereby realizing filter function.

[0039] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the utility model and are not intended to limit the utility model. Without departing from the spirit and scope of the utility model, various changes and improvements can be made to the utility model, and these changes and improvements fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A power supply system for integrated circuit electromagnetic compatibility test, comprising a front-stage voltage reduction module (1), a rear-stage voltage reduction module (2), a main control module (3) and a filter module (4), characterized in that: The pre-depression module (1), the post-depression module (2) and the filter module (4) are electrically connected in sequence, the pre-depression module (1) is used for rectification and voltage reduction, the main control module (3) obtains the output current of the post-depression module (2) and outputs a PWM signal to control the output voltage of the post-depression module (2), and the filter module (4) is used for filtering interference signals.

2. The power system for integrated circuit electromagnetic compatibility testing according to claim 1, characterized in that: The pre-depression module (1) comprises 220V mains, a primary coil, a secondary coil, a rectifier bridge and a capacitor C1. The two ends of the primary coil are connected to the live wire and the zero line of the 220V mains respectively, the two ends of the secondary coil are connected to the two input ends of the rectifier bridge respectively, the two ends of the capacitor C1 are connected to the two output ends of the rectifier bridge respectively, the second end of the capacitor C1 is connected to the ground, and the two ends of the capacitor C1 serve as the output ends of the pre-depression module (1).

3. The power system for integrated circuit electromagnetic compatibility testing of claim 1, wherein: The post-depression module (2) comprises an NMOS tube, a diode D, an inductor L1, a capacitor C2, resistors R1, R2, R3, R4 and an operational amplifier. The source of the NMOS tube and the negative electrode of the diode D serve as the input ends of the post-depression module (2), the output port of the main control module (3) is connected to the gate of the NMOS tube, the drain of the NMOS tube is connected to the positive electrode of the diode D, the first end of the inductor L1 is connected to the negative electrode of the diode D, the second end of the inductor L1 is connected to the first end of the capacitor C2, the second end of the capacitor C2 is connected to the positive electrode of the diode D, and the two ends of the capacitor C2 serve as the output ends of the post-depression module (2). The first end of the resistor R1 is connected to the non-inverting input end of the operational amplifier, the second end of the resistor R1 is connected to the first end of the capacitor C2, the output end of the operational amplifier is connected to the input port of the main control module (3), the first end of the resistor R4 is connected to the ground, the second end of the resistor R4 is connected to the first end of the resistor R1, the first end of the resistor R2 is connected to the inverting input end of the operational amplifier, the second end of the resistor R2 is connected to the second end of the capacitor C2, the first end of the resistor R3 is connected to the output end of the operational amplifier, and the second end of the resistor R3 is connected to the first end of the resistor R2.

4. The power system for integrated circuit electromagnetic compatibility testing of claim 1, wherein: The filter module (4) comprises capacitors C3, L2, C4, C5 and C6. The two ends of the capacitor C3 serve as the input ends of the filter module (4), the first end of the inductor L2 is connected to the first end of the capacitor C3, the second end of the inductor L2 is connected to the second end of the capacitor C3, the first end of the capacitor C4 is connected to the third end of the inductor L2, the second end of the capacitor C4 is connected to the fourth end of the inductor L2, the first end of the capacitor C5 is connected to the first end of the capacitor C4, the second end of the capacitor C5 is connected to the ground, the first end of the capacitor C6 is connected to the ground, the second end of the capacitor C6 is connected to the second end of the capacitor C4, and the two ends of the capacitor C4 serve as the output ends of the filter module (4).

5. The power system for integrated circuit electromagnetic compatibility testing of claim 4, wherein: The inductor L2 is a differential mode inductor, the capacitors C3 and C4 are differential mode capacitors, and the capacitors C5 and C6 are common mode capacitors.

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