Control method of high-isolation dual-frequency output power supply

Abstract

The invention discloses a control method of a high-isolation dual-frequency output power supply, and relates to the technical field of electronic power supplies, the dual-frequency output power supply comprises a power conversion unit, an energy transmission unit and an output control unit, and the control method comprises the following steps: adopting a PWM control signal to control the power conversion unit to generate a composite AC signal; applying the composite AC signal to a primary winding of the energy transmission unit, and inducing and generating an AC voltage at a secondary winding; frequency separation is carried out on the alternating-current voltage through the output control unit, an alternating-current signal with the needed frequency is extracted, rectification and voltage stabilization processing is carried out on the alternating-current signal, and an analog direct-current signal and a digital current signal are output. According to the technical scheme, a composite alternating current signal and frequency separation mode is adopted to achieve double-frequency output, the size and weight of the power supply are reduced, meanwhile, the low-ripple and low-noise power supply quality is guaranteed, and miniaturization and high-efficiency operation of modern electronic equipment is achieved.

Description

Technical Field

[0001] This application relates to the field of electronic power supply technology, and in particular to a control method for a high-isolation dual-frequency output power supply. Background Technology

[0002] In modern electronic devices, with increasing integration, more and more systems need to simultaneously meet the power supply requirements of both analog and digital circuits. Analog circuits have higher power supply requirements, typically needing clean power supplies with low ripple and low noise, such as operational amplifiers and sensor interfaces; while digital circuits have relatively higher tolerance for power supply ripple, but place greater emphasis on the dynamic response and stability of the power supply. Traditional power supply design solutions cannot adequately meet these multiple requirements.

[0003] Existing mixed-signal power supply solutions typically employ discrete power systems, including two independent DC-DC converters. However, this approach suffers from drawbacks such as high cost, large PCB footprint, and low efficiency. Furthermore, the coexistence of multiple power modules can lead to noise interference between them, affecting system stability. While using a single power supply with a linear regulator (LDO) simplifies the design, the LDO introduces additional power losses and temperature rise, reducing overall efficiency, especially in high-current scenarios where it can easily become a performance bottleneck. Traditional power frequency transformer solutions, although providing clean power, are bulky and heavy, failing to meet the miniaturization and onboard requirements of modern electronic devices, significantly limiting their application. Summary of the Invention

[0004] The purpose of this application is to provide a control method for a high-isolation dual-frequency output power supply, which aims to solve the technical problem that existing power supplies cannot meet the miniaturization and onboard requirements of modern electronic devices.

[0005] To achieve the above objectives, this application proposes a control method for a high-isolation dual-frequency output power supply. The dual-frequency output power supply includes a power conversion unit, an energy transmission unit, and an output control unit. The control method includes: A PWM control signal is generated based on a low-frequency modulation signal and a high-frequency carrier signal, and the PWM control signal is used to control the power conversion unit to generate a composite AC signal. The composite AC signal is applied to the primary winding of the energy transmission unit, and an AC voltage is induced in the secondary winding through electromagnetic coupling. The AC voltage is frequency-separated by the output control unit to extract the AC signal of the required frequency. The AC signal is then rectified and regulated to output an analog DC signal and a digital current signal.

[0006] In one embodiment, the power conversion unit includes a modulation controller and a push-pull inverter circuit; the modulation controller is used to generate a PWM control signal based on a low-frequency modulation signal and a high-frequency carrier signal, and the push-pull inverter circuit is used to receive a DC input signal and convert the DC input signal into a composite AC signal under the control of the PWM control signal.

[0007] In one embodiment, generating the PWM control signal based on the low-frequency modulation signal and the high-frequency carrier signal includes: comparing a 50 Hz sinusoidal modulation wave with a 1 kHz triangular carrier wave to generate a PWM signal whose duty cycle varies with 50 Hz.

[0008] In one embodiment, the energy transmission unit includes a high isolation transformer, which includes an insulation structure consisting of an epoxy resin board inserted between the primary winding and the secondary winding. The epoxy resin board has a thickness of 1.6 mm, such that the insulation strength between the primary winding and the secondary winding is less than 8 kV.

[0009] In one embodiment, the output control unit includes a filtering and demodulation circuit and a rectification and voltage regulation circuit; the filtering and demodulation circuit is used to perform frequency separation on the AC voltage through the output control unit to extract the AC signal of the desired frequency, including: Attenuate frequency components of 1kHz and above by using a low-pass filter; High-pass filters attenuate frequency components at 50Hz and below.

[0010] In one embodiment, the low-pass filter is a second-order LC filter; And / or, the high-pass filter is a first-order RC filter.

[0011] In one embodiment, the rectifier and voltage regulator circuit is used to rectify and regulate the AC signal respectively, and output an analog DC signal and a digital current signal.

[0012] In one embodiment, the dual-frequency output power supply further includes an auxiliary power supply unit, which includes an analog power supply branch and a digital power supply branch. The control method further includes: The analog power supply branch is rectified using a full-bridge rectifier circuit and filtered using an LC filter. The digital power supply branch is rectified using a synchronous rectifier circuit and filtered using a capacitor filter.

[0013] In one embodiment, the rectification of the analog power supply branch using a full-bridge rectifier circuit and the filtering using an LC filter include: Use diodes to construct a full-bridge rectifier circuit; A π-type filter is connected to the rectifier circuit for filtering.

[0014] In one embodiment, the rectification of the digital power supply branch using a synchronous rectifier circuit and the filtering using a capacitor filter include: Use a power MOSFET as a rectifier switch; A capacitor is connected in parallel at the output of the rectifier for filtering.

[0015] The above-mentioned technical solution of this application has at least the following beneficial technical effects: The technical solution of this application uses a PWM control signal to control the power conversion unit to generate a composite AC signal. This composite AC signal is applied to the primary winding of the energy transmission unit, and through electromagnetic coupling, an AC voltage is induced in the secondary winding. The AC voltage is then frequency-separated by the output control unit to extract the desired frequency AC signal. The AC signal is then rectified and regulated to output an analog DC signal and a digital current signal. This technical solution achieves dual-frequency output by using a composite AC signal and frequency separation, combining multiple output frequencies within the same power conversion unit. This reduces the need for multiple independent conversion units, which helps to reduce the size and weight of the power supply, while ensuring low ripple and low noise power quality. This, in turn, improves the system's integration and efficiency, facilitating the miniaturization and high-efficiency operation of modern electronic devices. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the high-isolation dual-frequency output power supply module provided in this application; Figure 2 This is a flowchart illustrating the control method for the high-isolation dual-frequency output power supply provided in this application; Figure 3 This is a schematic diagram of an embodiment of the signal modulation and power inversion of the control method for the high-isolation dual-frequency output power supply provided in this application; Figure 4 This is a schematic diagram of another embodiment of the signal modulation and power inversion of the control method for the high-isolation dual-frequency output power supply provided in this application; Figure 5 This is a schematic diagram of an embodiment of the energy coupling and high-voltage isolation of the control method for the high-isolation dual-frequency output power supply provided in this application; Figure 6 This is a schematic diagram of an embodiment of the frequency selection and filtering demodulation of the control method for the high-isolation dual-frequency output power supply provided in this application; Figure 7 This is a schematic diagram of an embodiment of the rectification and voltage regulation output of the control method for the high-isolation dual-frequency output power supply provided in this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this application. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0018] The embodiments described in this application are only some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments described herein without inventive effort are within the scope of protection of this application.

[0019] In modern electronic devices, with increasing integration, more and more systems need to simultaneously meet the power supply requirements of both analog and digital circuits. Analog circuits have higher power supply requirements, typically needing clean power supplies with low ripple and low noise, such as operational amplifiers and sensor interfaces; while digital circuits have relatively higher tolerance for power supply ripple, but place greater emphasis on the dynamic response and stability of the power supply. Traditional power supply design solutions cannot adequately meet these multiple requirements.

[0020] Existing mixed-signal power supply solutions typically employ discrete power systems, including two independent DC-DC converters. However, this approach suffers from drawbacks such as high cost, large PCB footprint, and low efficiency. Furthermore, the coexistence of multiple power modules can lead to noise interference between them, affecting system stability. While using a single power supply with a linear regulator (LDO) simplifies the design, the LDO introduces additional power losses and temperature rise, reducing overall efficiency, especially in high-current scenarios where it can easily become a performance bottleneck. Traditional power frequency transformer solutions, although providing clean power, are bulky and heavy, failing to meet the miniaturization and onboard requirements of modern electronic devices, significantly limiting their application.

[0021] To address the aforementioned technical problems, this application proposes a control method for a high-isolation dual-frequency output power supply. Please refer to [link / reference needed]. Figure 1 and Figure 3 The dual-frequency output power supply includes a power conversion unit, an energy transfer unit, and an output control unit. Please refer to [link / reference]. Figure 2 In one embodiment of this application, the control method for the high-isolation dual-frequency output power supply includes the following steps: S1. A PWM control signal is generated based on a low-frequency modulation signal and a high-frequency carrier signal, and the PWM control signal is used to control the power conversion unit to generate a composite AC signal; S2. A composite AC signal is applied to the primary winding of the energy transmission unit, and an AC voltage is induced in the secondary winding through electromagnetic coupling. S3. The AC voltage is frequency separated by the output control unit, the AC signal of the required frequency is extracted, the AC signal is rectified and regulated respectively, and the analog DC signal and digital current signal are output.

[0022] The technical solution of this application uses a PWM control signal to control the power conversion unit to generate a composite AC signal. This composite AC signal is applied to the primary winding of the energy transmission unit, and through electromagnetic coupling, an AC voltage is induced in the secondary winding. The AC voltage is then frequency-separated by the output control unit to extract the desired frequency AC signal. The AC signal is then rectified and regulated to output an analog DC signal and a digital current signal. This technical solution achieves dual-frequency output by using a composite AC signal and frequency separation, combining multiple output frequencies within the same power conversion unit. This reduces the need for multiple independent conversion units, which helps to reduce the size and weight of the power supply, while ensuring low ripple and low noise power quality. This, in turn, improves the system's integration and efficiency, facilitating the miniaturization and high-efficiency operation of modern electronic devices.

[0023] In one embodiment, the power conversion unit includes a modulation controller and a push-pull inverter circuit. The modulation controller generates a PWM control signal based on a low-frequency modulation signal and a high-frequency carrier signal. The push-pull inverter circuit receives a DC input signal and converts it into a composite AC signal under the control of the PWM control signal. This embodiment, through the cooperation of the modulation controller and the push-pull inverter circuit, can convert a DC input signal into a composite AC signal under control, improving power conversion efficiency and optimizing power transmission, which is beneficial to improving system stability and performance.

[0024] Please see Figures 3 to 7 In one embodiment, a PWM control signal is generated based on a low-frequency modulation signal and a high-frequency carrier signal, including: comparing a 50 Hz sinusoidal modulation wave with a 1 kHz triangular carrier wave to generate a PWM signal whose duty cycle varies with 50 Hz. This embodiment generates the PWM control signal by comparing the low-frequency sinusoidal modulation wave with the high-frequency triangular carrier wave, which can precisely adjust the duty cycle, making the power output more stable and facilitating low-ripple and high-efficiency power conversion. Specifically, a push-pull inverter circuit with a 24V DC input and MOSFETs is used, employing PWM modulation technology. Natural sampling PWM is used, comparing the 50Hz sinusoidal modulation wave with the 1kHz triangular carrier wave. When the instantaneous value of the modulation wave is greater than the carrier wave, a high level is output; otherwise, a low level is output. Mathematically, this is expressed as the modulation depth. ,in The modulation amplitude is 50Hz. The carrier amplitude is 1kHz. This is controlled by... The power distribution ratio between the two outputs can be precisely adjusted. The output waveform includes a 1kHz carrier frequency, a 50Hz modulation frequency, and their sideband components, meeting the requirements for subsequent frequency separation. This facilitates the "loading" of low-frequency energy onto the intermediate frequency carrier, laying the foundation for the use of small transformers, achieving frequency shifting, and avoiding the need for a huge magnetic core required for direct transmission of 50Hz.

[0025] Please see Figures 3 to 7 In one embodiment, the energy transmission unit includes a high-isolation transformer. The high-isolation transformer includes an insulation structure, which is an epoxy resin board inserted between the primary and secondary windings. The epoxy resin board is 1.6 mm thick, ensuring that the insulation strength between the primary and secondary windings is less than 8 kV. This embodiment, by using an epoxy resin insulation board in the high-isolation transformer, ensures safe insulation between the primary and secondary windings while maintaining efficient energy transmission, thus improving system reliability and safety. Specifically, the modulated composite waveform is applied to the specially designed primary winding of the high-isolation transformer. The transformer employs a unique insulation structure (1.6 mm epoxy resin board isolation) to ensure an insulation strength of 8 kV between the primary and secondary windings. Based on a 1 kHz operating frequency, high-permeability ferrite materials (such as PC40 and PC95) are selected. Compared to silicon steel sheets, ferrite has lower losses at 1 kHz and can effectively control volume. According to Faraday's law of electromagnetic induction, the key parameter to prevent core saturation is the volt-second product. The expression for calculating the number of turns is: ,in, Input voltage, ; For half a cycle time, Take a carrier frequency of 1kHz; Let f be the flux density swing amplitude, and take a conservative value. ; The effective cross-sectional area of ​​the selected EI28 magnetic core is calculated as follows: The number of turns is rounded up to 340. The number of secondary turns is calculated based on the output voltage requirement, and the calculation expression is: In the above expression, For rectifier diode voltage drop, This is for the maximum duty cycle. Furthermore, a 1.6mm thick epoxy resin board (FR-4 material) is physically inserted between the primary and secondary windings. This resin board is precision-machined into a skeleton shape to form a stable insulation barrier. The entire transformer employs vacuum epoxy resin potting technology to eliminate internal air gaps and form a uniform insulation system.

[0026] Please see Figures 3 to 7In one embodiment, the output control unit includes a filtering and demodulation circuit and a rectification and voltage regulation circuit. The filtering and demodulation circuit is used to perform frequency separation on the AC voltage through the output control unit to extract the AC signal of the desired frequency, including the following steps: A1. Attenuating frequency components of 1kHz and above through a low-pass filter; A2. Attenuating frequency components of 50Hz and below through a high-pass filter. This embodiment effectively extracts the AC signal of the desired frequency by performing frequency separation on the AC voltage through the filtering and demodulation circuit, reduces unnecessary frequency interference, and helps improve the quality and stability of the output signal.

[0027] Please see Figures 3 to 7 In one embodiment, a second-order LC filter is used as the low-pass filter. In this embodiment, using a second-order LC filter as the low-pass filter can effectively attenuate frequency components higher than 1kHz while ensuring the transparency of lower frequency components. The second-order LC filter has good filtering characteristics, enabling more accurate frequency separation and improving the system's frequency response and signal quality. Specifically, a second-order LC filter is used with a cutoff frequency of... Component values: L = 15mH (magnetically shielded inductor), C = 47μF (low ESR electrolytic capacitor), out-of-band attenuation: -40dB / decade, ensuring effective suppression of 1kHz components. Please see Figures 3 to 7 In one embodiment, the high-pass filter is a first-order RC filter. In this embodiment, using a first-order RC filter as the high-pass filter can effectively attenuate frequency components at 50Hz and below, while retaining higher frequency signals. Because RC filters have a simple structure and fast response speed, they are suitable for filtering low-frequency signals, effectively improving the system's extraction efficiency of the target frequency signal and optimizing signal quality. Specifically, a first-order RC filter is used, with a cutoff frequency of... Component values: R = 100Ω, C = 3.3μF (film capacitor), attenuation of approximately -20dB for 50Hz components.

[0028] Please see Figures 3 to 7 In one embodiment, the rectifier and voltage regulator circuit is used to rectify and regulate the AC signal, outputting an analog DC signal and a digital current signal. This embodiment uses a filter and demodulation circuit to perform frequency separation on the AC signal, effectively removing unnecessary frequency components and extracting the desired frequency signal, thus improving the quality and stability of the output signal. The rectifier and voltage regulator circuit converts the AC signal into a stable DC signal and a digital current signal, ensuring the accuracy and consistency of the output signal, which is beneficial for the efficient operation and control of the system, and improves the overall system reliability and adaptability.

[0029] Please see Figures 3 to 7In one embodiment, the dual-frequency output power supply further includes an auxiliary power supply unit, which comprises an analog power supply branch and a digital power supply branch. The control method further includes the following steps: B1. Rectifying the analog power supply branch using a full-bridge rectifier circuit and filtering it using an LC filter; B2. Rectifying the digital power supply branch using a synchronous rectifier circuit and filtering it using a capacitor filter. This embodiment, by employing different rectification and filtering methods for the analog power supply branch and the digital power supply branch respectively, can effectively handle the power requirements of analog and digital signals, providing efficient and stable power output. The full-bridge rectifier circuit and LC filter ensure a stable DC voltage output from the analog power supply branch, while the synchronous rectifier circuit and capacitor filter optimize the current characteristics of the digital power supply branch, which helps reduce noise interference and improve the overall power stability and efficiency of the system.

[0030] Please see Figures 3 to 7 In one embodiment, a full-bridge rectifier circuit is used for rectification of the analog power supply branch, and an LC filter is used for filtering. The steps include: C1. Constructing a full-bridge rectifier circuit using diodes; C2. Connecting a π-type filter to the rectifier circuit for filtering. This embodiment effectively converts AC signals into stable DC signals by combining a full-bridge rectifier circuit and a π-type filter, significantly reducing power supply noise and improving the stability of the output signal. The full-bridge rectifier circuit uses diodes to ensure rectification efficiency, while the use of a π-type filter further enhances the filtering effect, which is beneficial for providing a cleaner DC power supply and meeting the application requirements for high power supply stability. Specifically, the full-bridge rectification process is as follows: A full-bridge rectifier circuit is constructed using four diodes (D1, D2, D3, D4), or an integrated full-bridge rectifier is used. Utilizing the unidirectional conductivity of the diodes, the negative half-cycle of the 50Hz sine wave is flipped to the positive half-cycle. When the input voltage is positive at the top and negative at the bottom, the current path is: D1 → Load → D4. When the input voltage is negative at the top and positive at the bottom, the current path is: D2 → Load → D3. The result is that the input sine wave is converted into a unidirectional pulsating DC current with a frequency of 100Hz (ripple frequency is twice the input frequency). Its output voltage waveform is a series of connected sine wave peaks. Relevant formula: Ideally, the average output voltage (V_{dc}) after rectification is: ,in, This is the peak voltage of the input sine wave. Furthermore, the specific process of the π-type LC filter is as follows: A π-type filter (C1-L1-C2) consisting of inductor L1 and capacitors C1 and C2 is connected after the rectifier. Inductor L1: its inductive reactance... For 100Hz ripple, the inductive reactance is relatively large, exhibiting "AC blocking" behavior; while for DC (f=0), its impedance is almost zero, exhibiting "DC passing" behavior. Capacitors C1 / C2: their capacitive reactance... For 100Hz ripple, the capacitive reactance is very small, providing a low-impedance bypass path to ground for the ripple current; for DC, the capacitive reactance is infinite, equivalent to an open circuit. L1 and C form a voltage divider network, causing most of the 100Hz ripple voltage to drop across L1, while the ripple voltage received by the load (output terminal) is greatly attenuated. The π-type structure is more effective than a single LC filter. The result is: converting 100Hz pulsating DC into a smooth DC voltage, but still having a small amount of ripple and fluctuations caused by load changes. Ripple voltage formula (approximate): For LC filters, the ripple factor can be significantly reduced. Peak ripple voltage. It can be estimated as follows: ,in, For load current, The ripple frequency is 100Hz. This is the value of the filter capacitor. It can be seen that increasing the capacitor C effectively reduces ripple. The operation of a low-dropout linear regulator (LDO): The input of the LDO is connected to the output of a π-type filter, and its output is the final analog power supply. The LDO samples the output voltage through an internal error amplifier, compares it with a precision reference voltage, and dynamically adjusts the conduction level of the internal regulating transistor (MOSFET) to maintain a constant output voltage. It can suppress input voltage fluctuations and ripple. The key parameter is the Power Supply Rejection Ratio (PSRR). PSRR represents the LDO's ability to suppress input ripple at a specific frequency, measured in dB. The higher the PSRR, the better the suppression effect. For example, an LDO with a PSRR of 60dB can attenuate a 1000-fold increase in input ripple at 100Hz. Operating results: A very low ripple (below 1mV), clean noise, and highly stable DC voltage is obtained. Using a low-dropout linear regulator (LDO) is beneficial for ensuring the core of analog power supply quality, eliminating ripple and noise that the preceding stage could not completely filter out.

[0031] Please see Figures 3 to 7 In one embodiment, a synchronous rectifier circuit is used for rectification in the digital power supply branch, and a capacitor filter is used for filtering. The steps include: D1. Using a power MOSFET as a rectifier switch; D2. Connecting a capacitor in parallel at the output of the rectifier for filtering. This embodiment effectively improves the rectification efficiency and filtering effect of the digital power supply branch through the cooperation of the synchronous rectifier circuit and the capacitor filter. Using a power MOSFET as a rectifier switch significantly reduces energy loss during rectification and improves the overall system efficiency. The capacitor filter, used in parallel at the output, further smooths the output signal, reduces power supply noise interference, and improves the stability and reliability of the digital power supply. Specifically, the synchronous rectification process is as follows: using a power MOSFET with extremely low on-resistance... A power MOSFET replaces the diode as the rectifier switch. Driven by a synchronous rectifier controller, the MOSFET turns on and off at precise times, functioning identically to a diode, but with an extremely low forward voltage drop (only a fraction of the diode's voltage drop). Compared to the analog branch: Traditional diode rectification has a fixed voltage drop of approximately 0.7V, resulting in power loss. Losses in synchronous rectification The efficiency is significantly improved under high current. The operating result is: pulsating high-frequency DC power is obtained, with extremely high rectification efficiency. The capacitor filtering process is as follows: A large-capacity MLCC (multilayer ceramic capacitor) or several capacitors are directly connected in parallel at the rectifier output. The energy storage function of the capacitor is utilized. At the peak of the rectified voltage, the capacitor is charged; at the trough, the capacitor discharges to the load, thereby maintaining the stability of the output voltage. Due to the high operating frequency (1kHz), the required filter capacitor value can be much smaller than that of the analog branch (50Hz rectified to 100Hz). According to the ripple formula... ,frequency The higher the capacitance required to achieve the same ripple level, the more important it is. The smaller the ripple, the better. This results in an output with a certain amount of high-frequency ripple (e.g., 20-50mV) but stable DC voltage. Digital circuits themselves have strong noise immunity, and their power supply pins typically have numerous local decoupling capacitors that absorb this high-frequency ripple. Using power MOSFETs with extremely low on-resistance instead of diodes as rectifier switches converts AC to smooth DC and stabilizes it at the desired voltage value. The termination condition is that the output DC voltage stabilizes at its rated value (e.g., +12V, +5V) and the ripple is below a set threshold. Ultimately, this yields a low-ripple analog DC power supply and a fast-response digital DC power supply, thus providing high-quality power to the load that meets its characteristics.

[0032] In one specific embodiment, the dual-frequency power supply converts the 24V DC input into an AC waveform via a push-pull inverter circuit. The modulation controller employs sinusoidal pulse width modulation (PWM) technology to modulate a 50Hz low-frequency signal onto a 1kHz carrier wave, generating a composite AC waveform, which is then stored in the power conversion unit. The dual-frequency power supply uses a high-isolation transformer for energy transmission and isolation. This transformer features a special insulation structure, with a 1.6mm thick epoxy resin board serving as an insulating layer between the primary and secondary windings, achieving an isolation voltage of over 8kV to meet high safety requirements. The dual-frequency power supply uses a filtering and demodulation circuit to separate the frequency of the transformer's secondary output. The analog branch uses a low-pass filter with a cutoff frequency of 200Hz to extract a pure 50Hz sine wave; the digital branch uses a high-pass filter with a cutoff frequency of 500Hz to extract the 1kHz AC component. The dual-frequency power supply converts the separated AC signal into DC output through a rectifier and voltage regulator circuit. The analog branch uses a full-bridge rectifier with LC filtering and LDO regulation to output clean DC with a ripple of less than 5mV. The digital branch uses synchronous rectification with capacitor filtering to output a DC power supply with fast dynamic response. Users can connect load circuits through the output interface to simultaneously provide power to analog and digital circuits with different characteristics, achieving low-noise power for analog circuits and high-efficiency power for digital circuits.

[0033] In another specific embodiment, an intelligent control function is added based on the above specific embodiments, demonstrating the scalability and applicability of this application. The dual-frequency power supply establishes a connection with an external intelligent monitoring system through a communication module, uploading operating status parameters in real time, including input voltage, output voltage, output current, operating temperature, and other information. The intelligent monitoring system analyzes the power supply's operating efficiency through a built-in algorithm and automatically optimizes modulation parameters according to load changes. The dual-frequency power supply monitors the load status of the two outputs in real time through an intelligent control module. When a light analog load is detected, the modulation depth is automatically reduced, and the 50Hz component power distribution is decreased to improve overall efficiency. When a large dynamic change in the digital load is detected, the carrier frequency is automatically adjusted, dynamically changing around 1kHz, and spreading spectrum technology is used to reduce electromagnetic interference. Users can view the power supply's operating status through a remote monitoring interface, including real-time efficiency curves, temperature distribution diagrams, output quality analysis, and other data. The system provides intelligent optimization suggestions, such as recommending optimal operating parameter settings based on load characteristics and suggesting heat dissipation improvement schemes based on temperature distribution. In addition, remote intelligent control can also achieve the following functions: ① Remotely set modulation parameters, allowing users to select or customize parameters such as modulation method, carrier frequency, and modulation depth according to application scenarios; ② Remotely monitor power quality and monitor performance indicators such as output voltage ripple and dynamic response in real time; ③ Support remote firmware upgrades to optimize control algorithms; ④ Provide energy efficiency analysis reports, including energy-saving effect assessments and carbon emission reduction calculations.

[0034] This application aims to protect a control method for a high-isolation dual-frequency output power supply. The technical solution of this application uses a PWM control signal to control the power conversion unit to generate a composite AC signal. The composite AC signal is applied to the primary winding of the energy transmission unit. Through electromagnetic coupling, an AC voltage is induced in the secondary winding. The AC voltage is frequency-separated by the output control unit to extract the AC signal of the required frequency. The AC signal is rectified and regulated separately to output an analog DC signal and a digital current signal. This method can effectively reduce the size and weight of the power supply while ensuring low ripple and low noise power supply quality, thereby improving the system integration and efficiency. It is beneficial to realize the miniaturization and high-efficiency operation of modern electronic devices.

[0035] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this application and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this application should be included within the protection scope of this application. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A control method of a high-isolation dual-frequency output power supply, characterized by, The double-frequency output power supply comprises a power conversion unit, an energy transmission unit and an output control unit, and the control method comprises: generating a PWM control signal based on a low-frequency modulation signal and a high-frequency carrier signal, and using the PWM control signal to control the power conversion unit to generate a composite alternating current signal; applying the composite alternating current signal to a primary winding of the energy transmission unit, and generating an alternating voltage in a secondary winding through electromagnetic coupling; performing frequency separation on the alternating voltage through the output control unit, extracting an alternating current signal of a required frequency, and rectifying and stabilizing the alternating current signal to output an analog direct current signal and a digital current signal.

2. The control method of a high-isolation dual-frequency output power supply according to claim 1, characterized by, The power conversion unit comprises a modulation controller and a push-pull inverter circuit. The modulation controller is configured to generate a PWM control signal based on a low-frequency modulation signal and a high-frequency carrier signal, and the push-pull inverter circuit is configured to receive a direct current input signal and convert the direct current input signal into a composite alternating current signal under the control of the PWM control signal.

3. The control method of a high-isolation dual-frequency output power supply according to claim 2, characterized by, The generation of the PWM control signal based on the low-frequency modulation signal and the high-frequency carrier signal comprises: comparing a 50 Hz sinusoidal modulation wave with a 1 kHz triangular carrier wave to generate a PWM signal with a duty cycle varying with 50 Hz.

4. The control method of a high-isolation dual-frequency output power supply according to claim 1, characterized by, The energy transmission unit comprises a high-isolation transformer, and the high-isolation transformer comprises an insulation structure, which is an epoxy resin plate inserted between the primary winding and the secondary winding, and the thickness of the epoxy resin plate is 1.6 mm, so that the insulation strength between the primary winding and the secondary winding is less than 8 kV.

5. The control method of a high-isolation dual-frequency output power supply according to claim 1, wherein The output control unit comprises a filter demodulation circuit and a rectification and stabilization circuit. The filter demodulation circuit is configured to perform frequency separation on the alternating voltage through the output control unit, extract an alternating current signal of a required frequency, and comprises: attenuating frequency components of 1 kHz and above through a low-pass filter; attenuating frequency components of 50 Hz and below through a high-pass filter.

6. The control method of a high-isolation dual-frequency output power supply according to claim 5, wherein The low-pass filter adopts a second-order LC filter. And / or, the high-pass filter adopts a first-order RC filter.

7. The control method of a high-isolation dual-frequency output power supply according to claim 5, wherein The rectification and stabilization circuit is configured to rectify and stabilize the alternating current signal to output an analog direct current signal and a digital current signal.

8. The control method of a high-isolation dual-frequency output power supply according to claim 7, wherein The double-frequency output power supply further comprises an auxiliary power supply unit, and the control method further comprises: rectifying the analog power supply branch using a full-bridge rectification circuit and filtering using an LC filter; rectifying the digital power supply branch using a synchronous rectification circuit and filtering using a capacitor filter.

9. The control method of a high-isolation dual-frequency output power supply according to claim 7, wherein, The rectification of the analog power supply branch using a full-bridge rectification circuit and the filtering using an LC filter comprise: using diodes to construct a full-bridge rectification circuit; connecting a π-type filter to the rectification circuit for filtering.

10. The control method of a high-isolation dual-frequency output power supply according to claim 7, wherein, The rectification of the digital power supply branch using a synchronous rectification circuit and the filtering using a capacitor filter comprise: using a power MOSFET as a rectification switch; connecting a capacitor in parallel to the output of the rectifier for filtering.

Images