Multi-channel direct current power supply

Abstract

The application relates to the technical field of electronic circuits, and discloses a multi-channel direct-current power supply. The multi-channel direct-current power supply comprises a controller and a plurality of direct-current conversion topologies; the direct-current conversion topologies are used for outputting direct-current power supply signals when powered on; the controller is connected with the direct-current conversion topologies, and the controller is used for converting the direct-current power supply signals output by the direct-current conversion topologies into electric signals with interference noise characteristics. According to the embodiment of the application, a signal generator does not need to be additionally introduced when external equipment is subjected to anti-interference testing, and the testing cost of anti-interference is reduced.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a multi-channel DC power supply. Background Technology

[0002] A multi-channel DC power supply is a power supply device that can simultaneously provide multiple independent DC output channels. Each channel can independently set parameters such as voltage and current, making it suitable for applications requiring multiple power supplies or complex testing scenarios. However, in related technologies, multi-channel DC power supplies only support basic voltage / current control and cannot superimpose interference noise into the DC output. This necessitates the use of an external signal generator for interference performance testing, increasing the cost of interference immunity testing. Utility Model Content

[0003] The purpose of this application is to provide a multi-channel DC power supply that eliminates the need for an additional signal generator when performing anti-interference tests on external devices, thereby reducing the cost of anti-interference testing.

[0004] This application provides a multi-channel DC power supply, including: Multiple DC-DC conversion topologies are used to output DC power supply signals upon power-up; A controller, connected to each of the DC-DC conversion topologies, is used to convert the DC power supply signal output by the DC-DC conversion topologies into an electrical signal with interference noise characteristics.

[0005] In some embodiments, the controller sends an unsteady control signal to the power feedback port of the DC-DC conversion topology, causing the DC power supply signal output by the DC-DC conversion topology to be converted into an electrical signal with interference noise characteristics.

[0006] In some embodiments, the controller configures the voltage value of the DC power supply signal output by the DC conversion topology by sending a steady-state control signal to the power feedback port of the DC conversion topology.

[0007] In some embodiments, the multi-channel DC power supply further includes: A signal coupling topology is connected between the controller and the power feedback port of the DC-DC conversion topology, and is used to transmit the control signal output by the controller to the power feedback port of the DC-DC conversion topology.

[0008] In some embodiments, the multi-channel DC power supply further includes: A current sampling topology, connected to the DC-DC conversion topology, is used to sample the current value of the DC signal output by the DC-DC conversion topology and obtain the corresponding current sampling signal; A signal conversion topology, connected between the current sampling topology and the controller, is used to convert the current sampling signal of the current sampling topology into a corresponding digital signal and transmit it to the controller.

[0009] In some embodiments, the controller is also configured to power on or off the DC-DC conversion topology.

[0010] In some embodiments, the number of DC-DC conversion topologies is eight.

[0011] In some embodiments, the controller is a microcontroller, a DSP chip, or an FPGA chip.

[0012] The beneficial effects of this application are: when external equipment needs to be tested for anti-interference, there is no need to connect an additional signal generator. Instead, the DC power supply signal output by the DC-DC conversion topology is converted into an electrical signal with interference noise characteristics by the controller. This solves the problem that traditional tests require an external signal generator and coupling network. It has the advantages of simplifying the configuration of interference test equipment, reducing test costs, improving the control accuracy of interference signals and test efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the multi-channel DC power supply provided in the first embodiment of this application.

[0014] Figure 2 This is a schematic diagram of the structure of the multi-channel DC power supply provided in the second embodiment of this application. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0016] It should be noted that the terms "first," "second," "third," "fourth," etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device that includes a series of circuits is not necessarily limited to those explicitly listed, but may include other circuits not explicitly listed or inherent to such systems, products, or devices.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0018] See Figure 1 In one embodiment, the multi-channel DC power supply includes a controller 100 and a plurality of DC conversion topologies 200, with the controller 100 connected to each DC conversion topology 200.

[0019] DC-DC conversion topology 200 is used to output a DC power supply signal upon power-up. DC-DC conversion topology 200 refers to a circuit module that can realize power conversion, which can be implemented using buck, boost, or buck-boost switching power supply topologies, such as a BUCK circuit structure that includes inductors, power switches, and feedback networks.

[0020] The controller 100 is used to convert the DC power supply signal output by the DC-DC conversion topology 200 into an electrical signal with interference noise characteristics. The controller 100 refers to a processing unit with signal generation and modulation functions. The controller 100 can generate a pulse signal with a variable duty cycle through a PWM module to adjust the operating state of the DC-DC conversion topology 200, so that a preset interference waveform is superimposed on the output DC power supply signal.

[0021] In practical applications, one or more DC-DC converter topologies 200 output corresponding DC power supply signals after power-on to power external devices. For external devices requiring anti-interference testing, the controller 100 converts the DC power supply signal output by the DC-DC converter topology 200 supplying the external device into an electrical signal with interference noise characteristics to perform anti-interference testing on the external device. Specifically, the controller 100 can change the reference voltage of the feedback network of the DC-DC converter topology 200 supplying the external device, forcing the DC power supply signal output by the DC-DC converter topology 200 to generate periodic fluctuations, thereby forming interference noise with specific spectral characteristics in the DC power supply signal, i.e., having interference noise characteristics. The controller 100 can convert the DC power supply signals output by multiple DC-DC converter topologies 200 into electrical signals with different interference noise characteristics, converting the DC power supply signal output by one DC-DC converter topology 200 into an electrical signal with high-frequency ripple characteristics, and converting the DC power supply signal output by another DC-DC converter topology 200 into an electrical signal with low-frequency harmonic characteristics.

[0022] In some embodiments, the controller 100 sends an unsteady control signal to the power feedback port of the DC-DC conversion topology 200, thereby converting the DC power supply signal output by the DC-DC conversion topology 200 into an electrical signal with interference noise characteristics.

[0023] Non-steady-state control signals refer to control signals whose amplitude or frequency varies with time, and can be implemented using pulse width modulation signals, random pulse sequences, or frequency sweep signals. The power supply feedback port is the interface in the DC-DC converter topology 200 used to receive voltage regulation signals, and can be implemented using a voltage divider circuit or an error amplifier to dynamically adjust the operating point of the output voltage by receiving control signals.

[0024] In practical applications, the controller 100 generates an unsteady control signal, which may contain high-frequency components or random fluctuations. This unsteady control signal is injected into the feedback loop of the DC-DC conversion topology 200 through its power feedback port. The unsteady control signal then influences the closed-loop regulation mechanism of the DC-DC conversion topology 200, causing interference noise components corresponding to the unsteady control signal to be superimposed on the output DC power supply signal. For example, when the unsteady control signal is a pulse sequence with a frequency varying in the range of 10kHz to 100kHz, the output DC power supply signal will generate corresponding ripple noise.

[0025] In some embodiments, the controller 100 configures the voltage value of the DC power supply signal output by the DC conversion topology 200 by sending a steady-state control signal to the power feedback port of the DC conversion topology 200.

[0026] A steady-state control signal refers to a control signal in which voltage or current parameters remain constant. Specifically, it can be implemented using a pulse width modulation signal with a fixed duty cycle or an analog signal with a constant level.

[0027] In practical applications, the controller 100 generates a steady-state control signal and transmits it to the power feedback port of the DC-DC converter topology 200. Utilizing the voltage regulation mechanism in the feedback loop, a preset voltage value is configured at the output of the DC-DC converter topology 200. For example, when the controller 100 inputs a control signal with a specific voltage value to the power feedback port of the DC-DC converter topology 200, the voltage value of the DC voltage signal output by the DC-DC converter topology 200 will adjust to the corresponding current value following the control signal, thereby enabling independent voltage settings for multiple DC-DC converter topologies 200.

[0028] See Figure 2 In one embodiment, the multi-channel DC power supply further includes a signal coupling topology 300. The signal coupling topology 300 is connected to the power feedback port of the controller 100 and the DC-DC conversion topology 200. Figure 2 Between the feedback (hereinafter the same) in the DC-DC converter topology 200, the signal coupling topology 300 is used to transmit the control signal output by the controller 100 to the power feedback port of the DC-DC converter topology 200.

[0029] Signal coupling topology 300 refers to a circuit structure that can achieve signal transmission and circuit isolation. Specifically, it can be implemented using transformers, optocouplers, or magnetic coupling devices. It transmits control signals through electromagnetic induction or photoelectric conversion while blocking DC component interference.

[0030] In practical applications, when the controller 100 generates a control signal (steady-state or non-steady-state) for adjusting the DC power supply signal, the signal coupling topology 300 transmits the control signal to the power feedback port via electromagnetic coupling or opto-isolation. For example, when the controller 100 needs to superimpose interference noise characteristics, the non-steady-state control signal generates an optical signal through the light-emitting diode of the optocoupler, triggering the phototransistor at the receiving end to conduct, thereby injecting the non-steady-state control signal into the power feedback port, so that the DC-DC conversion topology 200 outputs a DC power supply signal superimposed with noise. The signal coupling topology 300 achieves electrical isolation between the controller 100 and the power circuit through signal coupling, preventing high-frequency noise backlash from damaging the control circuit.

[0031] See again Figure 2 In one embodiment, the multi-channel DC power supply further includes a current sampling topology 400 and a signal conversion topology 500. The current sampling topology 400 is connected to the DC conversion topology 200, and the signal conversion topology 500 is connected between the current sampling topology 400 and the controller 100. The current sampling topology 400 is used to sample the current value of the DC signal output by the DC conversion topology 200 and obtain the corresponding current sampling signal. The signal conversion topology 500 is used to convert the current sampling signal of the current sampling topology 400 into a corresponding digital signal and transmit it to the controller 100.

[0032] Current sampling topology 400 refers to the circuit structure used to acquire output current data in real time. Specifically, it can be implemented using a current detection circuit based on a Hall sensor or a precision sampling resistor, converting the current signal into a voltage signal for measurement. Signal conversion topology 500 refers to the functional module that converts analog signals to digital signals. Specifically, it can be implemented using an analog-to-digital converter or an integrated signal conditioning chip, converting the continuously changing current signal into discrete data recognizable by the controller 100 through quantization processing.

[0033] In practical applications, the current value of the DC power supply signal output by the DC conversion topology 200 is converted into a voltage signal by the sensor element in the current sampling topology 400. This signal is then filtered and amplified before being transmitted to the signal conversion topology 500. The signal conversion topology 500 converts the analog voltage signal into a digital signal through an analog-to-digital converter circuit, and then transmits the quantized current value to the controller 100 through a digital interface. Thus, the controller 100 can acquire the current parameters of each channel in real time, providing data support for closed-loop control or status monitoring.

[0034] In some embodiments, the controller 100 is also used to power on or power off the DC-DC conversion topology 200. In practical applications, when the controller 100 receives a start command, it sends a command to the independent control port of the DC-DC conversion topology 200. Figure 2 The controller 100 sends a conduction signal to the EN port of the DC-DC converter topology 200 to trigger the internal power switch to close, thus enabling power-on. When power needs to be disconnected, the controller 100 outputs a cutoff signal to drive the power switch to open, completing the power-off operation. This process does not require manual operation of the physical switch or external control equipment; the power supply state switching is directly completed through the internal logic of the controller 100.

[0035] In some embodiments, the number of DC-DC conversion topologies 200 is eight. In practical applications, when a multi-channel DC power supply needs to simultaneously apply different interference noises to multiple units under test, the eight DC-DC conversion topologies 200 can independently output eight DC power supply signals with noise characteristics. Each conversion topology adjusts its output characteristics through a separate control signal. For example, in anti-interference testing, differentiated interference can be applied to eight circuits under test simultaneously without the need for an additional signal generator. This architecture integrates the interference superposition function into the power supply system through hardware integration, enabling each channel to have independent noise injection capability.

[0036] In some embodiments, the controller 100 is a microcontroller, DSP chip, or FPGA chip. Specifically, the microcontroller, DSP chip, or FPGA chip receives the analog signal transmitted by the current sampling topology 400 through its built-in analog-to-digital conversion module, and converts the analog signal into a digital signal based on a preset algorithm, thereby generating a corresponding control signal. The control signal is transmitted to the power feedback port of the DC-DC conversion topology 200 via the signal coupling topology 300, and changes the voltage of the DC power supply signal or adds interference noise characteristics by adjusting the duty cycle or frequency parameters. In addition, the multi-channel control capability of the microcontroller, DSP chip, or FPGA chip supports independent management of the power-on, power-off, and parameter configuration of eight DC-DC conversion topologies 200, ensuring the stability of the output of each channel.

[0037] In summary, the multi-channel DC power supply provided in this application embodiment does not require an additional signal generator when external devices need to perform anti-interference tests. Instead, the controller converts the DC power supply signal output from the DC conversion topology into an electrical signal with interference noise characteristics, solving the problem of traditional tests requiring an external signal generator and coupling network. It has the advantages of simplifying the configuration of interference test equipment, reducing test costs, improving the control accuracy of interference signals, and increasing test efficiency.

[0038] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0039] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A multi-channel DC power supply, characterized in that, include: Multiple DC-DC conversion topologies are used to output DC power supply signals upon power-up; A controller, connected to each of the DC-DC conversion topologies, is used to convert the DC power supply signal output by the DC-DC conversion topologies into an electrical signal with interference noise characteristics.

2. The multi-channel DC power supply according to claim 1, characterized in that, Also includes: A signal coupling topology is connected between the controller and the power feedback port of the DC-DC conversion topology, and is used to transmit the control signal output by the controller to the power feedback port of the DC-DC conversion topology.

3. The multi-channel DC power supply according to claim 1, characterized in that, Also includes: A current sampling topology, connected to the DC-DC conversion topology, is used to sample the current value of the DC signal output by the DC-DC conversion topology and obtain the corresponding current sampling signal; A signal conversion topology, connected between the current sampling topology and the controller, is used to convert the current sampling signal of the current sampling topology into a corresponding digital signal and transmit it to the controller.

4. The multi-channel DC power supply according to claim 1, characterized in that, The number of DC-DC conversion topologies is eight.

5. The multi-channel DC power supply according to claim 1, characterized in that, The controller is a microcontroller, DSP chip, or FPGA chip.

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