CN-122001186-A - Control system and method for avoiding resonance point of high-frequency high-efficiency special power supply

Abstract

The application discloses a high-frequency high-efficiency special power supply avoidance resonance point control system and method, and relates to the field of special power supply control. The system comprises a power supply unit, a first current acquisition unit, a second current acquisition unit, a voltage acquisition unit, a virtual damping compensation module, a virtual damping coefficient and a feedback voltage control module, wherein the first current acquisition unit acquires a first current signal flowing through a parasitic inductor, the second current acquisition unit acquires a second current signal flowing to a load, the voltage acquisition unit acquires a load end voltage signal, the virtual damping compensation module performs difference value operation on the first current signal and the second current signal and then multiplies the first current signal by the virtual damping coefficient to obtain a damping voltage, the damping voltage is summed with the load end voltage signal to obtain the feedback voltage, and the feedback voltage is compared with a reference voltage by the voltage control module and is regulated. Virtual damping voltage is introduced in the control algorithm layer, virtual resistance is equivalently connected in series with a capacitor, a resonance peak value is reduced, the phase is improved from step hysteresis to smooth transition, the stability and the robustness of the system are improved, and heating loss is avoided without adding physical devices.

Inventors

• BAI HONGCHAO
• YU JINBIAO
• ZHU CHEN
• SHI WENWEN
• DONG HUINA

Assignees

• 山东艾诺智能仪器有限公司

Dates

Publication Date

20260508

Application Date

20260408

Claims (7)

1. 1. The utility model provides a high frequency high efficiency special type power avoids resonance point control system, includes power supply unit, its characterized in that still includes: A parasitic inductance and a load side capacitive element are arranged between the output end and the load end of the power supply unit, and the parasitic inductance and the load side capacitive element form an LC resonance network; A first current acquisition unit for acquiring a first current signal flowing through the parasitic inductance ; A second current acquisition unit for acquiring a second current signal flowing to the load ; The voltage acquisition unit is used for acquiring voltage signals of the load end ; A virtual damping compensation module for compensating the first current signal Second current signal And a voltage signal Calculating feedback voltage In particular for the first current signal And the second current signal Performing difference operation to obtain a difference signal and a virtual damping coefficient Multiplying to obtain damping voltage, and comparing the damping voltage with the load terminal voltage signal Summing operation is carried out to obtain the feedback voltage ; A voltage control module for comparing the feedback voltage with a reference voltage The comparison is made and the adjustment is made.
2. 2. The high frequency high efficiency specialty power evasion resonance point control system of claim 1, further comprising: the voltage effective value loop module is used for outputting the reference voltage; and the current inner loop module is used for receiving the output of the voltage control module and carrying out current regulation.
3. 3. The high-frequency high-efficiency special power supply avoidance resonance point control system according to claim 1, wherein the voltage control module comprises an error calculation unit and a proportional-integral controller, wherein the error calculation unit is configured to calculate an error signal between the feedback voltage and the reference voltage, in particular, calculate a difference between the reference voltage and the feedback voltage as the error signal.
4. 4. The method for controlling the evading resonance point of the high-frequency high-efficiency special power supply is applied to a power supply system comprising a power supply unit, parasitic inductance from an output end to a load end and a load, and comprises the steps of collecting a voltage signal of the load end, comparing the voltage signal with a reference voltage and adjusting the voltage signal, and is characterized by further comprising the following steps: collecting a first current signal flowing through the parasitic inductance ; Collecting a second current signal flowing to the load ; Performing difference operation on the first current signal and the second current signal; the difference signal and the virtual damping coefficient Multiplying to obtain damping voltage; the damping voltage and the load end voltage signal are summed to obtain a feedback voltage ; The feedback voltage is set With reference voltage Comparing to obtain an error signal; and performing proportional integral adjustment on the error signal, and outputting a control signal.
5. 5. The control method for avoiding resonance points of a high-frequency and high-efficiency special power supply according to claim 4, wherein the sampling frequency of collecting the first current signal, the second current signal and the load terminal voltage signal is greater than or equal to 10 times of the working frequency.
6. 6. The high-frequency high-efficiency special power supply evasion resonance point control method according to claim 4, further comprising: the step of generating the reference voltage through a voltage effective value loop is specifically to collect an output voltage effective value, compare the output voltage effective value with a voltage effective value set value, and output the reference voltage after proportional integral adjustment.
7. 7. The high-frequency high-efficiency special power supply evasion resonance point control method according to claim 6, further comprising: And a step of current regulation through a current inner loop, in particular comparing the control signal with a current limiting value, and limiting the amplitude of the control signal when the current exceeds the current limiting value.

Description

Control system and method for avoiding resonance point of high-frequency high-efficiency special power supply Technical Field The invention relates to the field of special power supply control, in particular to a high-frequency high-efficiency special power supply resonance point avoidance control system and method. Background The high-frequency high-efficiency special power supply is a power electronic device with high-efficiency output characteristics and working frequency within the range of 100 kHz-10 MHz, and is widely applied to the fields of electromagnetic compatibility testing, radio frequency power amplification, plasma excitation, power electronic converter testing and the like. Along with the development of power electronics technology and the improvement of application requirements, higher requirements are put on the output frequency range, dynamic response speed and system stability of the high-frequency special power supply. In the practical application of the high-frequency special power supply, parasitic inductance exists in a connecting line between the power supply output end and the load, and the load also has equivalent capacitance characteristics. These parasitic inductances and load equivalent capacitances form an LC resonant network. When the power supply operating frequency approaches the natural resonant frequency of the LC network, the gain curve of the system open loop transfer function will rise sharply around the resonant frequency, forming a significant resonant peak, while the phase will exhibit a step hysteresis approaching 180 degrees. The resonance phenomenon causes the output voltage or power supply noise to be obviously amplified near the resonance frequency, the phase margin and the gain margin of the system are seriously reduced, the stability of the control system is seriously challenged, and the output performance of the power supply and the safe operation of a load are influenced. In order to suppress LC resonance phenomenon, the prior art generally adopts a method of optimizing hardware design to reduce the parasitic inductance and the value of the parasitic capacitance. For example, the parasitic inductance is reduced by shortening the length of the connecting line, adopting a plurality of strands of parallel wires, optimizing the layout of the PCB, or the capacitance parameter is adjusted by selecting a load with low capacitance characteristic, adding decoupling capacitance, and the like. However, under high frequency operating conditions, even with optimized hardware design, the effects of spurious parameters are still strongly amplified, and the space for hardware optimization is very limited, which makes it difficult to fundamentally eliminate resonance problems. Another prior art solution is to connect passive devices in series or parallel in an LC resonant network, as shown in fig. 1, to reduce the resonance peak or change the resonance frequency by changing the impedance characteristics of the system. This method can suppress resonance phenomena to some extent by adding physical devices to adjust the frequency response characteristics of the system. However, the series or integrated passive devices absorb the energy of the resonance peak and convert it into heat during operation, which generates power loss, reduces the overall efficiency of the system, and also introduces additional phase shift. In addition, the parameters of the physical devices added at one time are fixed, and when the working condition of the system is changed or the load parameters are changed, the devices with the fixed parameters cannot be adjusted in a self-adaptive mode, so that the resonance suppression effect is reduced, and the flexibility and the adaptability of the system are poor. In summary, in the prior art, in terms of suppressing the LC resonance of the high-frequency power supply, there are problems that the hardware optimization space is limited, the additional power consumption and heat are introduced when the physical damping device is added, and the adaptability is poor. Disclosure of Invention The invention aims to provide a control system and a control method for avoiding resonance points of a high-frequency high-efficiency special power supply, which are used for solving the technical problems of poor system stability and poor robustness caused by steep gain rise and phase step hysteresis of a parasitic LC network between an output end of the high-frequency special power supply and a load in the prior art, and simultaneously avoiding the problems of heating loss and insufficient flexibility caused by a traditional passive device scheme. The invention aims to achieve the aim, and the aim is achieved by the following technical scheme: A high-frequency high-efficiency special power supply evasion resonance point control system comprises a power supply unit and further comprises: A parasitic inductance and a load side capacitive element are arranged between the output