CN219247713U - Synchronous networking numerical control direct current step-down power supply based on FPGA - Google Patents
Synchronous networking numerical control direct current step-down power supply based on FPGA Download PDFInfo
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Abstract
The utility model belongs to the technical field of power supplies, and relates to a synchronous networking numerical control direct current step-down power supply based on an FPGA, which comprises at least one power supply module; the power supply module comprises a power supply controller based on an FPGA, at least one voltage conversion circuit, a current feedback circuit and a voltage feedback circuit; the PWM controller is provided with a PWM generator and clock synchronization interface; the voltage conversion circuit comprises a switching tube driving circuit, a switching tube circuit and a filtering output circuit. The numerical control direct current step-down power supply is digitally controlled and synchronized through the FPGA, so that multiphase staggered output and full-bridge output are facilitated; the output flexibility is high, the output current and the output voltage are controllable, and the device can be used as a low-frequency waveform generator or a power supply for simulating indefinite power; the control cost of the multiphase parallel power supply is reduced, and the workload in designing a large-scale power supply is reduced through a modularized single power supply module channel.
Description
Technical Field
The utility model relates to the technical field of power supplies, in particular to a synchronous networking numerical control direct current step-down power supply based on an FPGA.
Background
Most existing step-down power modules depend on the existing power control chip and do not support programmable voltage output, and the programmable power module has a complicated structure because the programmable power module comprises a circuit of a digital control part, and compared with a power module with constant value output, the programmable power module has large volume and high price.
The maximum current of a single synchronous buck power module is typically dependent on its inductance and the maximum pass current of the transistor. In order to cope with the increasing power supply demands, besides the components with higher power, the upper limit of the passing current of the power supply can be improved by a power supply parallel connection method. The parallel step-down power supply with multiphase staggered output has higher requirement on time sequence precision, and is usually controlled by pure numbers based on a specific power chip or FPGA.
The Chinese patent with the application number of 2020227790442 discloses a numerical control BUCK circuit which can realize closed-loop control of output voltage, but the scheme has the problems that the timing accuracy of a power supply controlled by an MCU is low, and when a plurality of power supplies are connected in parallel, the power supplies cannot be synchronous, so that the problem that the networking capability is weak due to multiphase staggered output can not be solved.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a synchronous networking numerical control direct current step-down power supply based on an FPGA, which comprises at least one power supply module; the power supply module comprises a power supply controller based on an FPGA, at least one voltage conversion circuit, a current feedback circuit and a voltage feedback circuit; the power supply controller is provided with a PWM generator and clock synchronization interface; the PWM generator is in signal connection with the clock synchronization interface;
the voltage conversion circuit comprises a switching tube driving circuit, a switching tube circuit and a filtering output circuit; the output end of the power supply controller is electrically connected with the input end of the switching tube circuit through the switching tube driving circuit; the output end of the switching tube circuit is electrically connected with the input end of the filtering output circuit; the output end of the filtering output circuit is electrically connected with the input end of the current feedback circuit and the first input end of the voltage feedback circuit; a second input end of the voltage feedback circuit is connected with a remote sensing voltage input circuit;
the output end of the current feedback circuit and the output end of the voltage feedback circuit are respectively connected with the input end of the power supply controller in an electric signal mode.
The beneficial effects of the utility model are as follows: the output voltage of the numerical control direct current step-down power supply is subjected to pure digital control through the FPGA, PWM signals of the switching tube are directly generated by the FPGA module, and meanwhile, synchronization can be carried out through the FPGA, so that the purposes of multiphase staggered output and full-bridge output are achieved;
the numerical control direct current step-down power supply has high output flexibility, and can be used as a low-frequency waveform generator or used for simulating an power supply with indefinite power because the output current and the output voltage are controllable;
the utility model reduces the control cost of the multiphase parallel power supply, and greatly reduces the repeated workload of power engineers in designing a large-scale power supply through a modularized single power supply module channel.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the switching tube circuit comprises a first switching tube and a second switching tube; the first output end of the switching tube driving circuit is connected with the grid electrode electric signal of the first switching tube; the second output end of the switching tube driving circuit is electrically connected with the grid electrode of the second switching tube; the drain electrode of the first switching tube is used for inputting voltage signals; the source electrode of the first switching tube is electrically connected with the output end of the switching tube circuit and the drain electrode of the second switching tube; and the source electrode of the second switching tube is grounded.
Further, the output end of each voltage conversion circuit is also connected with a transformer; the output end of each voltage conversion circuit is electrically connected with the input end of the transformer; a plurality of power supply modules are respectively arranged at a first input end and a second input end of the primary side of the transformer; the power supply modules are electrically connected with a first input end of the primary side of the transformer, the power supply modules are electrically connected with a second input end of the primary side of the transformer, and each power supply module and the transformer form a full-bridge inverter circuit.
Further, the filtering output circuit comprises an inductor and a capacitor; the output end of the switching tube circuit is electrically connected with the first end of the inductor; the second end of the inductor is electrically connected with the first end of the capacitor, the input end of the current feedback circuit and the input end of the voltage feedback circuit; the second end of the capacitor is grounded.
Further, the current feedback circuit comprises a current signal acquisition circuit and a first amplifying acquisition circuit; the input end of the current signal acquisition circuit is electrically connected with the output end of the voltage conversion circuit; the output end of the current signal acquisition circuit is electrically connected with the first input end of the power supply controller through the first amplifying acquisition circuit;
the voltage feedback circuit comprises a voltage signal acquisition circuit, a remote sensing signal acquisition circuit, a selection switch and a second amplification acquisition circuit; the input end of the voltage signal acquisition circuit is electrically connected with the output end of the switching tube circuit; the input end of the remote sensing signal acquisition circuit is used for inputting remote sensing signals; the output end of the voltage signal acquisition circuit and the output end of the remote sensing signal acquisition circuit are connected with the input node of the selection switch; and an output node of the selection switch is electrically connected with a second input end of the power supply controller through the second amplification acquisition circuit.
Further, the first amplifying and collecting circuit comprises a first operational amplifier and a first analog-to-digital converter; the second amplifying and collecting circuit comprises a second operational amplifier and a second analog-to-digital converter; the current signal acquisition circuit is in electrical signal connection with the input end of the first analog-to-digital converter through the first operational amplifier; the output end of the first analog-to-digital converter is electrically connected with the input end of the power supply controller; the output node of the selection switch is electrically connected with the input end of the second analog-to-digital converter through the second operational amplifier; the output end of the second analog-to-digital converter is electrically connected with the input end of the power supply controller.
Further, the voltage signal acquisition circuit comprises a first voltage division circuit; the first voltage dividing circuit comprises a first resistor and a second resistor; the first end of the first resistor is electrically connected with the output end of the switching tube circuit; the second end of the first resistor is electrically connected with the first end of the second resistor and the first input node of the selection switch; the second end of the second resistor is grounded;
the remote sensing signal acquisition circuit comprises a second voltage division circuit; the second voltage dividing circuit comprises a third resistor and a fourth resistor; the first end of the third resistor is electrically connected with the first end of the fourth resistor and the second input node of the selection switch; the second end of the third resistor is used for inputting remote sensing signals; the second end of the fourth resistor is grounded.
Further, the input end of each power supply controller is connected with an upper computer; and each power supply controller is in communication connection with the upper computer through an SPI communication bus.
Drawings
FIG. 1 is a schematic block diagram of a synchronous networking digital control direct current step-down power supply based on an FPGA according to an embodiment of the utility model;
fig. 2 is a circuit diagram of a specific implementation of a synchronous networking digital control direct current step-down power supply based on an FPGA according to an embodiment of the present utility model;
FIG. 3 is a circuit diagram of a full bridge inverter circuit consisting of two power modules;
FIG. 4 is a circuit diagram of a simplified positive half cycle equivalent full bridge inverter circuit;
FIG. 5 is a circuit diagram of a simplified negative half cycle equivalent full bridge inverter circuit;
FIG. 6 is a schematic diagram of the waveforms of the voltages at the two input terminals of the primary side of the transformer and the output voltage at the secondary side of the transformer;
FIG. 7 is a circuit diagram of a two-phase interleaved output network incorporating two power modules;
FIG. 8 is a circuit diagram of a single-pass power supply with three power modules equivalent to a three-phase interleaved output;
fig. 9 is a circuit diagram of a configuration in which a plurality of power modules are simultaneously configured through an SPI bus.
Icon: r1-a first resistor; r2-a second resistor; r3-a third resistor; r4-fourth resistor; l-inductance; c-capacitance; q1-a first switching tube; q2-a second switching tube; SW-selection switch; v1-a first operational amplifier; v2-a second operational amplifier; ADC 1-a first analog-to-digital converter; ADC 2-second analog-to-digital converter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As an embodiment, in order to solve the above technical problems, as shown in fig. 1, the embodiment provides a synchronous networking digital control dc voltage reduction power supply based on FPGA, which includes at least one power module; the power supply module comprises a power supply controller based on an FPGA, at least one voltage conversion circuit, a current feedback circuit and a voltage feedback circuit; the power supply controller is provided with a PWM generator and clock synchronization interface; the PWM generator is connected with the clock synchronous interface signal;
the voltage conversion circuit comprises a switching tube driving circuit, a switching tube circuit and a filtering output circuit; the output end of the power supply controller is electrically connected with the input end of the switching tube circuit through the switching tube driving circuit; the output end of the switching tube circuit is electrically connected with the input end of the filtering output circuit; the output end of the filtering output circuit is electrically connected with the input end of the current feedback circuit and the first input end of the voltage feedback circuit; a second input end of the voltage feedback circuit is connected with a remote sensing voltage input circuit;
the output end of the current feedback circuit and the output end of the voltage feedback circuit are respectively connected with the input end of the power supply controller in an electric signal mode. Optionally, as shown in fig. 2, the switching tube circuit includes a first switching tube Q1 and a second switching tube Q2; the first output end of the switching tube driving circuit is electrically connected with the grid electrode of the first switching tube Q1; the second output end of the switching tube driving circuit is electrically connected with the grid electrode of the second switching tube Q2; the drain electrode of the first switching tube Q1 is used for voltage signal input; the source electrode of the first switching tube Q1 is electrically connected with the output end of the switching tube circuit and the drain electrode of the second switching tube Q2; the source of the second switching tube Q2 is grounded.
Optionally, the output end of each voltage conversion circuit is also connected with a transformer; the output end of each voltage conversion circuit is electrically connected with the input end of the transformer; a plurality of power supply modules are respectively arranged at a first input end and a second input end of the primary side of the transformer; the power modules are electrically connected with a first input end of the primary side of the transformer, the power modules are electrically connected with a second input end of the primary side of the transformer, and each power module and the transformer form a full-bridge inverter circuit.
In the practical application process, since the power supply consists of a high-side MOS tube and a low-side MOS tube, when the power supply outputs 0V voltage, the output of the power supply can be directly short-circuited to the ground. In this state, the power supply can sink current from the output. If one power supply is used to output current and the other power supply is used to sink current, the two power supply modules can form a full bridge circuit. The full bridge mode can be widely applied to scenes requiring bidirectional current drive, such as transformer drive and motor drive. Taking a transformer driving circuit as an example, two power supply modules and a transformer form a full-bridge inverter circuit, and the circuit connection of the full-bridge inverter circuit is shown in fig. 3.
The circuit can be used for simulating mains voltage output, specifically, the upper computer controls the two power modules to alternately output sine waves of half cycles, when the transformer outputs sine waves of positive half cycles, the power modules 1 generate sine waves of half cycles at the first input end of the transformer, the power modules 2 are connected with the second input end of the transformer through the low-side MOS tube of the power modules, and the simplified equivalent circuit is shown in figure 4.
When the transformer outputs a negative half-period waveform, a half-period sine wave is generated at the second row input end of the transformer by a plurality of sub-power supply modules 2, and the first input end of the transformer is grounded by a plurality of sub-power supply modules 1 of the power supply parallel network 2. When the transformer outputs a negative half-period waveform, the equivalent circuit after the output network is simplified is shown as figure 5, wherein the primary side first input end of the transformer is A, the primary side second input end of the transformer is B, and the output current of the transformer is I out The output voltage of the transformer is V out 。
In the inverter network, a schematic diagram of the voltage at two input ends of a primary side of a transformer and the waveform of the output voltage of a secondary side of the transformer is shown in fig. 6, wherein the horizontal axis is time t, and the vertical axis is the output voltage V of the transformer out Primary side first input voltage V of transformer A Primary side second input voltage V of transformer B 。
Optionally, two power supply modules are respectively arranged at the first input end and the second input end of the primary side of the transformer; two power supply modules are electrically connected with a first input end of the primary side of the transformer, the other two power supply modules are electrically connected with a second input end of the primary side of the transformer, and the four power supply modules and the transformer form a full-bridge inverter circuit.
In the practical application process, the full-bridge inverter network increases the output power by combining the multiphase staggered output network. Taking the case of combining two power supply modules with two-phase staggered output network as an example, the four power supply modules and the transformer form a full-bridge inverter circuit by a connection method shown in fig. 7, so that the maximum output current of the full-bridge inverter network can be doubled.
In the practical application process, the control signal output by the power supply controller is converted into a PWM signal by the PWM generator and is output to the voltage conversion circuit. The PWM signal may be synchronized to an external clock source via a synchronizing clock input signal, and the power controller may also output a synchronizing clock output signal having a frequency equal to the PWM signal and a different phase. Taking the case that three power supply modules are connected in parallel as an example, the phase of the synchronous clock output signals of the power supply modules is set to 120 degrees, and the three power supply modules are connected in parallel after being in phase-staggered synchronization through the synchronous clock, so that the three power supply modules are equivalent to a three-phase staggered output single-path power supply, as shown in figure 8.
Compared with a single power supply mode, the equivalent three-phase staggered output single-path power supply of the three power supply modules has the advantages that the output current of the single power supply module can be three times of that of the single power supply module, and the equivalent control frequency of the single power supply module is three times of that of the single power supply module, so that the ripple characteristic and the dynamic response speed of the single power supply module are superior to those of the single power supply module.
Optionally, as shown in fig. 2, the filtering output circuit includes an inductor L and a capacitor C; the output end of the switching tube circuit is electrically connected with the first end of the inductor L; the second end of the inductor L is electrically connected with the first end of the capacitor C, the input end of the current feedback circuit and the input end of the voltage feedback circuit; the second terminal of the capacitor C is grounded. In the practical application process, the inductor L and the capacitor C form a low-pass filter. The PWM signal output by the power supply controller is amplified by the voltage conversion circuit, filtered by the low-pass filter, converted into direct-current voltage and output to external equipment.
The current feedback circuit comprises a current signal acquisition circuit and a first amplifying acquisition circuit; the input end of the current signal acquisition circuit is electrically connected with the output end of the voltage conversion circuit; the output end of the current signal acquisition circuit is in electrical signal connection with the first input end of the power supply controller through the first amplifying acquisition circuit; alternatively, the first amplification and acquisition circuit uses a hall sensor such as ACS711 for measurement.
The voltage feedback circuit comprises a voltage signal acquisition circuit, a remote sensing signal acquisition circuit, a selection switch and a second amplifying acquisition circuit; the input end of the voltage signal acquisition circuit is electrically connected with the output end of the switching tube circuit; the input end of the remote sensing signal acquisition circuit is used for inputting remote sensing signals; the output end of the voltage signal acquisition circuit and the output end of the remote sensing signal acquisition circuit are connected with the input node of the selection switch; the output node of the selection switch is electrically connected with the second input end of the power supply controller through a second amplifying and collecting circuit.
Optionally, as shown in fig. 2, the voltage signal acquisition circuit includes a first voltage dividing circuit; the first voltage dividing circuit comprises a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is electrically connected with the output end of the switching tube circuit; the second end of the first resistor R1 is electrically connected with the first end of the second resistor R2 and the first input node of the selection switch SW; the second end of the second resistor R2 is grounded.
Optionally, as shown in fig. 2, the remote sensing signal acquisition circuit includes a second voltage division circuit; the second voltage dividing circuit comprises a third resistor R3 and a fourth resistor R4; the first end of the third resistor R3 is electrically connected with the first end of the fourth resistor R4 and the second input node of the selection switch SW; the second end of the third resistor R3 is used for inputting remote sensing signals; the second terminal of the fourth resistor R4 is grounded.
Optionally, as shown in fig. 2, the first amplifying and collecting circuit includes a first operational amplifier V1 and a first analog-to-digital converter ADC1; the second amplifying and collecting circuit comprises a second operational amplifier V2 and a second analog-to-digital converter ADC2; the current signal acquisition circuit is in electrical signal connection with the input end of the first analog-to-digital converter ADC1 through the first operational amplifier V1; the output end of the first analog-to-digital converter ADC1 is electrically connected with the input end of the power supply controller.
In the practical application process, the voltage feedback circuit of the digital control direct current step-down power supply can select through the selection switch SW to realize two voltage feedback modes, namely, the output voltage of one power supply is buffered by a second operational amplifier V2 such as an AD8051 through a first voltage dividing circuit consisting of a first resistor R1 and a second resistor R2, and is fed back to the FPGA module after analog-to-digital conversion by an analog-to-digital converter ADC2 such as an ADs 7883. The power supply can also use an external remote sensing feedback signal to realize a remote sensing control function so as to compensate the loss caused by a downstream circuit of the power supply. The remote sensing feedback signal is divided by a second voltage dividing circuit consisting of a third resistor R3 and a fourth resistor R4, is selected by a selection switch SW, and then is relayed to a subsequent second operational amplifier V2 and a second analog-to-digital converter ADC2 for sampling.
Optionally, the input end of each power supply controller is connected with an upper computer; each power supply controller is in communication connection with the upper computer through an SPI communication bus.
In the practical application process, as shown in fig. 9, a plurality of power modules can be configured through the SPI bus at the same time. Taking the case of controlling each power module separately as an example, the circuit connection of the SPI communication bus is shown in fig. 9, which allows the power modules to be added to the SPI communication bus without limitation, and the ports of each power module are respectively connected to the serial clock input terminal SCLK, the data input terminal MOSI, the chip select terminal CS, and the data output terminal MISO of the host computer.
The numerical control direct current step-down power supply has high output flexibility, and can be used as a low-frequency waveform generator because the output current and the output voltage are controllable, and the application range of the numerical control direct current step-down power supply comprises but is not limited to generating high-power arbitrary waveforms required by experiments, such as triangular waves, square waves, sine waves and the like, or being used for simulating power sources with indefinite powers, such as simulating battery discharge, simulating an output model of a solar panel during weather change and the like.
In the aspects of power synchronization and networking, the power controller can realize different functions based on various output networks, compared with the traditional parallel power scheme, the control cost of the multiphase parallel power is reduced, and the repeated workload of a power engineer in designing a large-scale power is greatly reduced through a modularized single power module channel. The voltage waveforms of half periods are alternately generated by controlling the power supply or the power supply network at both ends of the load, and a plurality of modules can also form a full bridge circuit for generating bidirectional current. The full-bridge network can be used for generating alternating current output with any voltage through a transformer, so that the full-bridge network can be applied to various scenes needing low-frequency inversion, such as a photovoltaic inverter and a DC-AC link of an uninterruptible power supply, and can also be used for driving electromagnetic equipment such as a motor, an electromagnetic coil and the like to provide a bidirectional electromagnetic field.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. The FPGA-based synchronous networking digital control direct current step-down power supply is characterized by comprising at least one power supply module; the power supply module comprises a power supply controller based on an FPGA, at least one voltage conversion circuit, a current feedback circuit and a voltage feedback circuit; the power supply controller is provided with a PWM generator and clock synchronization interface; the PWM generator is in signal connection with the clock synchronization interface;
the voltage conversion circuit comprises a switching tube driving circuit, a switching tube circuit and a filtering output circuit; the output end of the power supply controller is electrically connected with the input end of the switching tube circuit through the switching tube driving circuit; the output end of the switching tube circuit is electrically connected with the input end of the filtering output circuit; the output end of the filtering output circuit is electrically connected with the input end of the current feedback circuit and the first input end of the voltage feedback circuit; a second input end of the voltage feedback circuit is connected with a remote sensing voltage input circuit;
the output end of the current feedback circuit and the output end of the voltage feedback circuit are respectively connected with the input end of the power supply controller in an electric signal mode.
2. The FPGA-based synchronous networking digital control dc buck power supply of claim 1, wherein the switching tube circuit comprises a first switching tube and a second switching tube; the first output end of the switching tube driving circuit is connected with the grid electrode electric signal of the first switching tube; the second output end of the switching tube driving circuit is electrically connected with the grid electrode of the second switching tube; the drain electrode of the first switching tube is used for inputting voltage signals; the source electrode of the first switching tube is electrically connected with the output end of the switching tube circuit and the drain electrode of the second switching tube; and the source electrode of the second switching tube is grounded.
3. The FPGA-based synchronous networking digital control dc buck power supply of claim 2, wherein the output of each voltage conversion circuit is further connected with a transformer; the output end of each voltage conversion circuit is electrically connected with the input end of the transformer; a plurality of power supply modules are respectively arranged at a first input end and a second input end of the primary side of the transformer; the power supply modules are electrically connected with a first input end of the primary side of the transformer, the power supply modules are electrically connected with a second input end of the primary side of the transformer, and each power supply module and the transformer form a full-bridge inverter circuit.
4. The FPGA-based synchronous networking digital control dc buck power supply of claim 1, wherein the filter output circuit includes an inductor and a capacitor; the output end of the switching tube circuit is electrically connected with the first end of the inductor; the second end of the inductor is electrically connected with the first end of the capacitor, the input end of the current feedback circuit and the input end of the voltage feedback circuit; the second end of the capacitor is grounded.
5. The FPGA-based synchronous networking digital control dc buck power supply of claim 1, wherein the current feedback circuit includes a current signal acquisition circuit and a first amplification acquisition circuit; the input end of the current signal acquisition circuit is electrically connected with the output end of the voltage conversion circuit; the output end of the current signal acquisition circuit is electrically connected with the first input end of the power supply controller through the first amplifying acquisition circuit;
the voltage feedback circuit comprises a voltage signal acquisition circuit, a remote sensing signal acquisition circuit, a selection switch and a second amplification acquisition circuit; the input end of the voltage signal acquisition circuit is electrically connected with the output end of the switching tube circuit; the input end of the remote sensing signal acquisition circuit is used for inputting remote sensing signals; the output end of the voltage signal acquisition circuit and the output end of the remote sensing signal acquisition circuit are connected with the input node of the selection switch; and an output node of the selection switch is electrically connected with a second input end of the power supply controller through the second amplification acquisition circuit.
6. The FPGA-based synchronous networking digital control dc buck power supply of claim 5, wherein the first amplification acquisition circuit includes a first operational amplifier and a first analog-to-digital converter; the second amplifying and collecting circuit comprises a second operational amplifier and a second analog-to-digital converter; the current signal acquisition circuit is in electrical signal connection with the input end of the first analog-to-digital converter through the first operational amplifier; the output end of the first analog-to-digital converter is electrically connected with the input end of the power supply controller; the output node of the selection switch is electrically connected with the input end of the second analog-to-digital converter through the second operational amplifier; the output end of the second analog-to-digital converter is electrically connected with the input end of the power supply controller.
7. The FPGA-based synchronous networking digital control dc buck power supply of claim 5, wherein the voltage signal acquisition circuit includes a first voltage divider circuit; the first voltage dividing circuit comprises a first resistor and a second resistor; the first end of the first resistor is electrically connected with the output end of the switching tube circuit; the second end of the first resistor is electrically connected with the first end of the second resistor and the first input node of the selection switch; the second end of the second resistor is grounded;
the remote sensing signal acquisition circuit comprises a second voltage division circuit; the second voltage dividing circuit comprises a third resistor and a fourth resistor; the first end of the third resistor is electrically connected with the first end of the fourth resistor and the second input node of the selection switch; the second end of the third resistor is used for inputting remote sensing signals; the second end of the fourth resistor is grounded.
8. The FPGA-based synchronous networking numerical control direct current step-down power supply according to claim 1, wherein the input end of each power supply controller is connected with an upper computer; and each power supply controller is in communication connection with the upper computer through an SPI communication bus.
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| CN202320060857.7U CN219247713U (en) | 2023-01-09 | 2023-01-09 | Synchronous networking numerical control direct current step-down power supply based on FPGA |
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| CN202320060857.7U CN219247713U (en) | 2023-01-09 | 2023-01-09 | Synchronous networking numerical control direct current step-down power supply based on FPGA |
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