A multi-step programmable constant current source device

Abstract

The utility model belongs to the technical field of program-controlled power supply, and relates to a multi-gear program-controlled constant current source device, which comprises a power supply part, a main control part, a reference part, a relay control part, an output part, a sampling part, an error comparison part and the connection relationship thereof. The utility model makes the constant current source output direct current in the range of 0-10A, the current regulation precision is 10PPM, and the output power can reach more than 100W through the design of the power supply part, the main control part, the reference part, the relay control part, the output part, the sampling part, the error comparison part, the panel part and the alarm part and the connection relationship of the parts.

Description

Technical Field

[0001] This utility model relates to the field of programmable power supply technology, and in particular to a multi-level programmable constant current source device. Background Technology

[0002] In the field of high-end measuring instruments and scientific instruments, high-precision, multi-level constant current source equipment is required to provide stable current to drive the equipment to work normally.

[0003] Programmable constant current sources generally adopt voltage control, which means that a control voltage is first generated, and then the control voltage is converted into an output current through the VI circuit, so that the output current can be adjusted by the magnitude of the control voltage.

[0004] Depending on how the control voltage is generated, constant current sources vary significantly in output range and accuracy. Different applications require different current levels; for example, motor drives and servo system drives require large current outputs, reaching the ampere (A) level. In scientific research, testing, and calibration equipment, accuracy needs to be at the microampere (μA) level, with an output range at the milliampere (mA) level. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of current constant current sources, such as insufficient adaptability, inability to be applied to general scenarios from mA to A, and problems with insufficient accuracy, inflexible program controllability, and insufficient load capacity. Therefore, this invention provides a multi-level programmable constant current source device. The design is specifically tailored to the AC / DC auxiliary power supply module used in the device, incorporating a PFC circuit, LLC control circuit, and bilateral rectifier circuit to output a low-ripple voltage, providing a clean energy source for subsequent circuitry. A reference voltage is set by the main control unit, and µV-level precision adjustment is achieved using a 16-bit DAC. The voltage reference is converted into a controlled current, and MOSFET power devices combined with a relay matrix are used to achieve stable current output from the mA to A levels. The relay matrix switches the sampling circuit for different current output levels, sampling the current with precision resistors of different resistance values ​​for each level. The current output is monitored in real time and fed back to the circuit for dynamic adjustment, thereby stabilizing the output.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A multi-stage programmable constant current source device includes a power supply section, a main control section, a reference section, a relay control section, an output section, a sampling section, and an error comparison section; The power supply section includes an anti-interference filter, a rectifier bridge, a PFC circuit, a smoothing circuit, an LLC control circuit, a power supply circuit, and a smoothing / rectification circuit connected in sequence. The power supply section outputs a ±15V power supply voltage, a 5V digital voltage, and a 5V analog voltage. The main control section is electrically connected to the reference section and the relay control section; The relay control section is electrically connected to the output section and the sampling section; The reference section is electrically connected to the error comparison section; The sampling section is electrically connected to the error comparison section and the output section; The error comparison section is electrically connected to the output section.

[0007] The following is a further defined technical solution of this utility model: the LLC control circuit is electrically connected to the feedback circuit through optocoupler isolation, and the LLC control circuit is electrically connected to the protection circuit.

[0008] The following is a further defined technical solution of this utility model: the main control part is electrically connected to the panel part.

[0009] The following is a further defined technical solution of this utility model: the error comparison part is electrically connected to the alarm part.

[0010] Compared with the prior art, the present invention has the following technical effects: This invention, through the design and connection of various parts such as the power supply section, main control section, reference section, relay control section, output section, sampling section, error comparison section, panel section, and alarm section, enables the constant current source to output a DC range of 0-10A, a current adjustment accuracy of 10PPM, and an output power of over 100W.

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the device module connection of this utility model; Figure 2 This is a schematic diagram illustrating the working principle of the device of this utility model; Figure 3 This is a circuit connection diagram of the power supply section in this utility model; Figure 4 This is a schematic diagram illustrating the working principle of the reference part in this utility model; Figure 5This is a schematic diagram illustrating the working principle of the output section in this utility model; Figure 6 This is a schematic diagram illustrating the working principle of the sampling section in this utility model; Figure 7 This is a schematic diagram illustrating the working principle of the error comparison section in this utility model. Detailed Implementation

[0014] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0015] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0016] like Figure 1-7 As shown, a multi-level programmable constant current source device is provided, mainly composed of a power supply section, a main control section, a reference section, a relay control section, an output section, a sampling section, an error comparison section, a panel section, and an alarm section, etc. Figure 1 and 2 As shown.

[0017] Power supply section: Provides stable DC voltage for each component, thus adapting to the low ripple voltage requirements of different circuits. For example... Figure 3 As shown, the AC220V input first passes through an anti-interference filter to reduce common-mode signal interference and filter noise. The filtered AC current is then converted to DC by a rectifier bridge. After being filtered by a π-type power supply, it passes through a PFC circuit to suppress harmonic currents and improve the power factor. A smoothing circuit is then used to reduce output voltage ripple, while an LLC control circuit adjusts the resonant network to improve output efficiency and stability. The output voltage is precisely adjusted in real time by a feedback circuit to ensure stable output. Additionally, the system includes an independent protection circuit to achieve comprehensive monitoring and safety control of the LLC control circuit.

[0018] Panel section: This section handles human-computer interaction and serves as the direct carrier for user operation control and status monitoring. It mainly includes buttons and a screen. The buttons correspond to different functions of the constant current source, while the screen is used to display relevant data.

[0019] Main control section: It undertakes key functions such as instruction processing, module coordination, external interaction and status management. The main control section receives user operation instructions from the panel, parses the function of the buttons and sends the corresponding control instructions to the subsequent modules, thereby coordinating the cooperation between different modules of the device.

[0020] Relay control section: The key module for current output regulation. After receiving instructions from the main control section, it converts them into control actions for the output section, realizing functions such as switching between different levels and switching the direction of output current.

[0021] Reference section: such as Figure 4 As shown, a high-precision and high-stability reference signal is generated, providing a reference for error comparison and current output regulation, thereby stabilizing the output.

[0022] Output section: such as Figure 5 As shown, based on the coordinated instructions of the main control section, the reference section and the relay control section, the output path is changed by using the on and off control of the relay, and different current levels are adapted through an adjustable resistor network, thereby realizing the different functions corresponding to the buttons and providing a stable current with multiple levels and switchable polarity to the load.

[0023] Sampling section: such as Figure 6 As shown, the sampling section uses precision resistors of different resistance values ​​to achieve current closed-loop control, and collects current signals in real time and transmits them to the error comparison section.

[0024] Error comparison section: such as Figure 7 As shown, the sampled current signal is compared with the reference signal to generate an error adjustment signal. Part of the error adjustment signal is fed back to the conversion circuit to correct the output current deviation, and the other part is sent to the subsequent alarm circuit. The output section, sampling section, and error comparison section together constitute a closed-loop feedback control to stabilize the current output.

[0025] Alarm section: mainly detects abnormal states of the device. If the signal after error comparison exceeds a certain threshold, an alarm will be issued.

[0026] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the shape, structure, and principle of this utility model without departing from its technical solution should be covered within the protection scope of this utility model.

Claims

1. A multi-stage programmable constant current source device, characterized in that, It includes the power supply section, main control section, reference section, relay control section, output section, sampling section, and error comparison section; The power supply section includes an anti-interference filter, a rectifier bridge, a PFC circuit, a smoothing circuit, an LLC control circuit, a power supply circuit, and a smoothing / rectification circuit connected in sequence. The power supply section outputs a ±15V power supply voltage, a 5V digital voltage, and a 5V analog voltage. The main control section is electrically connected to the reference section and the relay control section; The relay control section is electrically connected to the output section and the sampling section; The reference section is electrically connected to the error comparison section; The sampling section is electrically connected to the error comparison section and the output section; The error comparison section is electrically connected to the output section.

2. The multi-stage programmable constant current source device as described in claim 1, characterized in that, The LLC control loop is electrically connected to the feedback circuit via optocoupler isolation, and the LLC control loop is electrically connected to the protection circuit.

3. The multi-stage programmable constant current source device as described in claim 1, characterized in that, The main control unit is electrically connected to the panel.

4. The multi-stage programmable constant current source device as described in claim 1, characterized in that, The error comparison section is electrically connected to the alarm section.

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