Power supply control system of aging machine

Abstract

The utility model discloses a power supply control system of an aging machine. The power supply control system comprises a single-chip microcomputer, a serial port communication circuit, a first I2C switch interface circuit, an I2C voltage setting and adjusting circuit, a reference voltage providing circuit, a voltage following and enhancing circuit and an adjustable power supply. Reference voltage is provided for the I2C voltage setting and adjusting circuit through the reference voltage providing circuit, and voltage following and loading capacity enhancing functions are provided for the I2C voltage setting and adjusting circuit through the voltage following and enhancing circuit. The single-chip microcomputer is used for controlling the I2C voltage setting and adjusting circuit to adjust the output voltage of the adjustable power supply through the first I2C switch interface circuit; the single-chip microcomputer reads and writes the I2C voltage setting and adjusting circuit through an I2C interface, the precision of a 12-bit-precision voltage change value is 0.001 V, the slow rising / slow falling function of output voltage can be completed within 1 millisecond, and then high-precision output and high response speed are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of aging test, in particular to a power supply control system of an aging machine. Background Art

[0002] Before a product leaves the factory, it is usually necessary to perform an aging test on it. During the aging test, a small voltage is required to control the output voltage of the dozen or so programmable power supplies used. The commonly used method is generally to use a single-chip microcomputer to control the digital-to-analog converter to complete the output. The accuracy and response speed depend largely on the digital-to-analog converter. The existing technology usually uses an 8-bit digital-to-analog converter DAC0832. DAC0832 can use a parallel interface, and the read and write speed is fast enough, but the accuracy is obviously insufficient, and it cannot achieve the microsecond voltage ramp-up / ramp-down function.

[0003] Based on this, a new solution is needed. Utility Model Content

[0004] The main purpose of the utility model is to provide a power supply control system for an aging machine.

[0005] To achieve the above-mentioned purpose, the utility model provides an aging machine power supply control system, including a single-chip microcomputer, a serial communication circuit, a first I2C switch interface circuit, an I2C voltage setting and adjustment circuit, a reference voltage providing circuit, a voltage following enhancement circuit and an adjustable power supply. The serial communication circuit and the first I2C switch interface circuit are connected to the single-chip microcomputer, the first I2C switch interface circuit, the reference voltage providing circuit, the voltage following enhancement circuit and the adjustable power supply are connected to the I2C voltage setting and adjustment circuit, and the single-chip microcomputer controls the I2C voltage setting and adjustment circuit via the first I2C switch interface circuit to adjust the output voltage of the adjustable power supply.

[0006] In the aging machine power supply control system provided by the utility model, the I2C voltage setting and regulating circuit adopts the MCP4725 converter.

[0007] In the aging machine power supply control system provided by the utility model, the voltage follower enhancement circuit includes an operational amplifier LM324ADR, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a transistor Q1 and a diode D1, the positive input end of the operational amplifier LM324ADR is connected to the I2C voltage setting adjustment circuit via the second resistor R2, and the reverse input end of the operational amplifier LM324ADR is connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5, and the sixth capacitor C6. The first end of the seventh capacitor C7, the emitter of the transistor Q1 and the anode of the diode D1 are connected to ground, the second end of the fifth resistor R5, the second end of the sixth capacitor C6, and the second end of the seventh capacitor C7 are grounded, the output end of the operational amplifier LM324ADR is connected to the base of the transistor Q1 via the third resistor R3, the collector of the transistor Q1 is connected to the 12V voltage via the first resistor R1, the cathode of the diode D1 is connected to the 5V voltage, the first control end of the operational amplifier LM324ADR is grounded via the fifth capacitor C5, and the first capacitor C1 and the second capacitor C2 are connected in parallel and connected to the second control end of the operational amplifier LM324ADR.

[0008] The aging machine power supply control system provided by the utility model further includes a second I2C switch interface circuit and a temperature measurement circuit, and the temperature measurement circuit is connected to the single chip microcomputer via the second I2C switch interface circuit.

[0009] The power supply control system of the aging machine provided by the utility model also includes a power supply voltage measurement circuit connected between the single chip microcomputer and the adjustable power supply.

[0010] The power supply control system of the aging machine provided by the utility model also includes a sampling current measurement circuit connected between the single chip microcomputer and the unit under test.

[0011] The aging machine power supply control system provided by the utility model has the following beneficial effects: the aging machine power supply control system provided by the utility model provides a reference voltage for the I2C voltage setting adjustment circuit through a reference voltage providing circuit, provides a voltage following and load capacity enhancement function for the I2C voltage setting adjustment circuit through a voltage following enhancement circuit, and then uses a single-chip microcomputer to control the I2C voltage setting adjustment circuit via a first I2C switch interface circuit to adjust the output voltage of the adjustable power supply; the single-chip microcomputer reads and writes the I2C voltage setting adjustment circuit through the I2C interface, and the 12-bit precision voltage change value precision is 0.001V, and the output voltage slow rise / slow fall function can be completed within 1 millisecond, thereby achieving high-precision output and fast response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work:

[0013] Figure 1 The figure shows a schematic diagram of a power supply control system of an aging machine provided by an embodiment of the utility model;

[0014] Figure 2 Shown Figure 1 The circuit diagram of the microcontroller shown;

[0015] Figure 3 Shown Figure 1 The circuit diagram of the serial communication circuit shown;

[0016] Figure 4 Shown Figure 1 A circuit diagram of a first I2C switch interface circuit shown;

[0017] Figure 5 Shown Figure 1 The circuit diagram of the I2C voltage setting and regulating circuit shown;

[0018] Figure 6 Shown Figure 1 A circuit diagram of a reference voltage providing circuit is shown;

[0019] Figure 7 Shown Figure 1 The circuit diagram of the voltage follower enhancement circuit shown;

[0020] Figure 8 Shown Figure 1 The circuit diagram of the adjustable power supply shown;

[0021] Fig. 9 Shown Figure 1 The circuit diagram of the temperature measurement circuit shown;

[0022] Fig.10 Shown Figure 1 The circuit diagram of the power supply voltage measurement circuit shown;

[0023] Fig.11 Shown Figure 1 The circuit diagram of sampling current measurement is shown. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings below. Typical embodiments of the utility model are given in the drawings. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] The general idea of ​​the utility model is: in order to solve the problem of insufficient power control accuracy of the aging machine in the prior art, the utility model provides an aging machine power control system, which provides a reference voltage for the I2C voltage setting adjustment circuit through a reference voltage providing circuit, provides voltage following and load capacity enhancement functions for the I2C voltage setting adjustment circuit through a voltage following enhancement circuit, and then uses a single-chip microcomputer to control the I2C voltage setting adjustment circuit via a first I2C switch interface circuit to adjust the output voltage of the adjustable power supply; the single-chip microcomputer reads and writes the I2C voltage setting adjustment circuit through the I2C interface, and the 12-bit precision voltage change value precision is 0.001V, and the output voltage slow rise / slow fall function can be completed within 1 millisecond, thereby achieving high-precision output and fast response speed.

[0027] In order to better understand the above-mentioned technical scheme, the above-mentioned technical scheme will be described in detail below in combination with the accompanying drawings and specific implementation methods. It should be understood that the embodiments of the utility model and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the utility model and the technical features in the embodiments can be combined with each other.

[0028] Figure 1 The figure shows the principle diagram of the power supply control system of the aging machine provided by one embodiment of the utility model. Figure 1As shown, the aging machine power control system includes a single-chip microcomputer 100, a serial communication circuit 200, a first I2C switch interface circuit 300, an I2C voltage setting and adjusting circuit 400, a reference voltage providing circuit 500, a voltage following enhancement circuit 600 and an adjustable power supply 700. Among them, the serial communication circuit 200 is connected to the single-chip microcomputer 100, the I2C voltage setting and adjusting circuit 400 is connected to the single-chip microcomputer 100 via the first I2C switch interface circuit 300, and the reference voltage providing circuit 500, the voltage following enhancement circuit 600 and the adjustable power supply 700 are connected to the I2C voltage setting and adjusting circuit 400. The reference voltage providing circuit provides a reference voltage for the I2C voltage setting and adjusting circuit, and the voltage following enhancement circuit provides a voltage following and load capacity enhancement function for the I2C voltage setting and adjusting circuit, and then the single-chip microcomputer controls the I2C voltage setting and adjusting circuit via the first I2C switch interface circuit to adjust the output voltage of the adjustable power supply.

[0029] Specifically, in one embodiment of the present utility model, Figure 2 As shown, the microcontroller Figure 4 The I2C interface shown reads and writes the I2C voltage setting and regulating circuit. The microcontroller completes a read and write cycle within 50us at an 8MHz clock, thereby being able to quickly respond to external signals and condition changes and perform precise voltage regulation and monitoring tasks.

[0030] Specifically, in one embodiment of the present utility model, Figure 5 As shown, the I2C voltage setting and regulating circuit 400 adopts the MCP4725 converter. By adopting the MCP4725 converter with a 12-bit I2C interface DAC, a read and write cycle is completed within 50us, and the voltage change value with 12-bit precision is 0.001V. The output voltage can be slowly increased / decreased within 1 millisecond. The circuit is simple and the cost is low. In this embodiment, the I2C voltage setting and regulating circuit provides up to 12-bit accurate voltage control capability, allows small voltage adjustments, simplifies circuit design and layout, and reduces cost and power consumption.

[0031] Specifically, in one embodiment of the present utility model, Figure 4 As shown, the MCP4725 converter is connected to the I2C switch interface PCA9548APWR, and then connected to the microcontroller system circuit via the PCA9548APWR. In this embodiment, the I2C switch interface circuit provides the ability for multiple I2C devices to control and communicate through a single bus, simplifying the connection and management of the system.

[0032] Specifically, in one embodiment of the present utility model, Figure 6As shown, the reference voltage providing circuit adopts ADR395BUJZ-REEL7 to provide the reference working voltage for MCP4725. The voltage following enhancement circuit adopts LM324ADR+MMBT2222ALT3G to provide the MCP4725 with voltage following and load capacity enhancement functions. In this embodiment, the reference voltage providing circuit can maintain high stability and low drift reference voltage output within a wide temperature range, and ensure the accuracy of voltage measurement and control of the entire system by providing a stable reference voltage. The voltage following enhancement circuit enhances the circuit's adaptability to load changes, ensures the stability of the output voltage, and ensures the immediacy and stability of the power supply output by quickly responding to voltage changes.

[0033] Further, in an embodiment of the present invention, if Figure 7 As shown, the voltage follower enhancement circuit 600 includes an operational amplifier LM324ADR, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a transistor Q1 and a diode D1. The positive input terminal of the operational amplifier LM324ADR is connected to the I2C voltage setting and adjusting circuit 400 via the second resistor R2, and the reverse input terminal of the operational amplifier LM324ADR is connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5, the first end of the sixth capacitor C6, the first end of the seventh capacitor C7, a transistor Q1 and a diode D1. The first end of capacitor C7, the emitter of transistor Q1 and the anode of diode D1, the second end of the fifth resistor R5, the second end of the sixth capacitor C6, and the second end of the seventh capacitor C7 are grounded, the output end of the operational amplifier LM324ADR is connected to the base of transistor Q1 via the third resistor R3, the collector of transistor Q1 is connected to the 12V voltage via the first resistor R1, the cathode of diode D1 is connected to the 5V voltage, the first control end of the operational amplifier LM324ADR is grounded via the fifth capacitor C5, and the first capacitor C1 and the second capacitor C2 are connected in parallel and connected to the second control end of the operational amplifier LM324ADR.

[0034] Specifically, in an embodiment of the present invention, a second I2C switch interface circuit 800 and a temperature measurement circuit 900 are further included. The temperature measurement circuit 900 is connected to the single chip computer 100 via the second I2C switch interface circuit 800. Fig. 9 As shown, the temperature measurement circuit uses P82B715+LM75 to achieve temperature measurement, which can realize the real-time temperature measurement function over long distances. In this embodiment, the temperature measurement circuit provides accurate temperature measurement capabilities, helps monitor the operating temperature of the system, and ensures that the system operates within a safe operating range.

[0035] Specifically, in one embodiment of the present invention, a power supply voltage measurement circuit 1000 connected between the single chip computer 100 and the adjustable power supply 700 is also included. Fig.10 As shown, by measuring the power supply voltage through LM324ADR, it is possible to measure whether the power supply output voltage is within the required range. In this embodiment, the power supply voltage measurement circuit provides the ability to monitor the power supply output voltage in real time to ensure that the output voltage meets the expected range.

[0036] Specifically, in one embodiment of the present invention, a sampling current measurement circuit 1010 connected between the single chip computer 100 and the unit under test is also included. Fig.11 As shown, the sampling current measurement circuit composed of MAX9920ASA+ and operational amplifiers OP07 and TL072 can measure the operating current of the unit under test. In this embodiment, the sampling current measurement circuit provides the ability to accurately measure the operating current of the unit under test, supporting in-depth analysis and optimization of circuit loads.

[0037] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0038] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various utility model aspects, in the above description of the exemplary embodiments of the utility model, the various features of the utility model are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be interpreted as reflecting the following intention: the claimed utility model requires more features than the features explicitly stated in each claim. More specifically, as reflected in the following claims, the utility model aspects are less than all the features of the single embodiment disclosed above. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the utility model.

[0039] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0040] It should be noted that the above embodiments illustrate the utility model rather than limit the utility model, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the existence of elements or steps not listed in the claims. The word "one" or "an" before an element does not exclude the existence of multiple such elements. The utility model can be implemented by means of hardware including several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices can be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words can be interpreted as names.

Claims

1. A power supply control system for an aging machine, characterized in that: The invention comprises a single-chip microcomputer (100), a serial communication circuit (200), a first I2C switch interface circuit (300), an I2C voltage setting and adjusting circuit (400), a reference voltage providing circuit (500), a voltage following enhancement circuit (600) and an adjustable power supply (700); the serial communication circuit (200) and the first I2C switch interface circuit (300) are connected to the single-chip microcomputer (100); the first I2C switch interface circuit (300), the reference voltage providing circuit (500), the voltage following enhancement circuit (600) and the adjustable power supply (700) are connected to the I2C voltage setting and adjusting circuit (400); the single-chip microcomputer (100) controls the I2C voltage setting and adjusting circuit (400) via the first I2C switch interface circuit (300) to adjust the output voltage of the adjustable power supply (700).

2. The aging machine power supply control system according to claim 1, characterized in that: The I2C voltage setting and regulating circuit (400) adopts the MCP4725 converter.

3. The aging machine power supply control system according to claim 1, characterized in that: The voltage follower enhancement circuit (600) comprises an operational amplifier LM324ADR, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a transistor Q1 and a diode D1, wherein the positive input terminal of the operational amplifier LM324ADR is connected to the I2C voltage setting and adjusting circuit (400) via the second resistor R2, and the negative input terminal of the operational amplifier LM324ADR is connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5, the first end of the sixth capacitor C6, The first end of the seventh capacitor C7, the emitter of the transistor Q1 and the anode of the diode D1, the second end of the fifth resistor R5, the second end of the sixth capacitor C6, and the second end of the seventh capacitor C7 are grounded, the output end of the operational amplifier LM324ADR is connected to the base of the transistor Q1 via the third resistor R3, the collector of the transistor Q1 is connected to the 12V voltage via the first resistor R1, the cathode of the diode D1 is connected to the 5V voltage, the first control end of the operational amplifier LM324ADR is grounded via the fifth capacitor C5, and the first capacitor C1 and the second capacitor C2 are connected in parallel and connected to the second control end of the operational amplifier LM324ADR.

4. The aging machine power supply control system according to claim 1, characterized in that: It also includes a second I2C switch interface circuit (800) and a temperature measurement circuit (900), wherein the temperature measurement circuit (900) is connected to the single chip computer (100) via the second I2C switch interface circuit (800).

5. The aging machine power supply control system according to claim 1, characterized in that: It also includes a power supply voltage measurement circuit (1000) connected between the single chip computer (100) and the adjustable power supply (700).

6. The aging machine power supply control system according to claim 1, characterized in that: It also includes a sampling current measurement circuit (1010) connected between the single chip computer (100) and the unit under test.

Images