An ultrasonic sieving system
By combining a rectifier circuit, a filter circuit, a PWM drive circuit, a high-frequency inverter circuit, and a resonant circuit, the resonant frequency of the screen is tracked and a 50Hz modulation wave is superimposed, which solves the problem of heat generation in the ultrasonic screening system due to non-resonant positions, improves screening efficiency, and reduces power consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN JIAYUANDA TECH CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-03
AI Technical Summary
Existing ultrasonic screening systems are prone to overheating and damage to the chassis and transducers due to operating in a non-resonant position, and they also consume a lot of power.
By combining a rectifier circuit, a filter circuit, a PWM drive circuit, a high-frequency inverter circuit, a resonant circuit, and a controller, the resonant frequency of the screen is tracked, and a 50Hz modulation wave is superimposed on the resonant frequency to improve the screening effect.
This enables the ultrasonic screening system to operate at the resonant frequency, improving screening efficiency and reducing power consumption.
Smart Images
Figure CN224443736U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of screening equipment technology, specifically to an ultrasonic screening system. Background Technology
[0002] An ultrasonic screening generator is a key piece of equipment that provides power to an ultrasonic vibrating screen and enables material screening. It is widely used in industries such as chemical, food, and pharmaceutical.
[0003] Currently, most analog ultrasonic screening generators on the market use fixed frequency output. The screening system as a whole may operate in a non-resonant position, which can easily cause the chassis and transducer to overheat and be damaged. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides an ultrasonic sieving system that can track the resonant frequency of the sieve.
[0005] This utility model provides an ultrasonic sieving system applied to an ultrasonic sieving generator, including a rectifier circuit, a filter circuit, a PWM drive circuit, a high-frequency inverter circuit, a resonant circuit, and a controller.
[0006] The rectifier circuit is connected to the filter circuit and the high-frequency inverter circuit respectively;
[0007] The controller's ADC channel is connected to the resonant circuit to acquire the collected detection signal, and the frequency tracking is achieved based on the frequency corresponding to the voltage extreme value in the detection signal, which is the resonant frequency. The resonant circuit is also connected to an external load transducer.
[0008] The controller is connected to the filter circuit via a relay, and the controller's PWM pin is connected to the high-frequency inverter circuit via the PWM drive circuit. The controller is configured to:
[0009] The relay is turned on / off based on the detection signal;
[0010] And whether to enable the PWM drive of the controller.
[0011] Furthermore, the controller is a microcontroller.
[0012] Furthermore, a driving device is connected between the controller and the relay. The controller controls the power supply to the relay through the driving device, thereby enabling or disabling the filtering circuit.
[0013] Furthermore, the driving device is a transistor.
[0014] Furthermore, the high-frequency inverter circuit is connected to the resonant circuit via a high-frequency transformer.
[0015] Furthermore, the resonant circuit includes a resonant inductor and multiple resonant capacitors.
[0016] Furthermore, the controller is also connected to external interactive devices via a communication interface.
[0017] The beneficial effects of this utility model are:
[0018] This utility model provides an ultrasonic sieving system that obtains the correct resonant frequency through ADC detection. After automatically tracking the resonant frequency of the screen, the PWM drive of the controller is activated, and the filter circuit is disconnected through a relay. This allows the sieving generator to operate with a 50Hz modulation wave from the power input, which significantly improves the sieving effect. At the same time, because it operates at the resonant position, it achieves the best effect with relatively low power. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0020] Figure 1 This invention provides a schematic block diagram of an ultrasonic sieving system.
[0021] Figure 2 A schematic diagram of the structure of a filter circuit provided by this utility model is shown;
[0022] Figure 3 A schematic diagram of the resonant circuit provided by this utility model is shown. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0025] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. Furthermore, it should be understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items, and all possible combinations thereof.
[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.
[0027] like Figure 1 , Figure 2 The diagram shows a principle block diagram of an ultrasonic screening system provided by this utility model, which is applied to an ultrasonic screening generator and includes a rectifier circuit, a filter circuit, a PWM drive circuit, a high-frequency inverter circuit, a resonant circuit, and a controller.
[0028] The rectifier circuit is connected to the filter circuit and the high-frequency inverter circuit respectively;
[0029] The controller's ADC channel is connected to the resonant circuit to acquire the collected detection signal, and the frequency tracking is achieved based on the frequency corresponding to the voltage extreme value in the detection signal, which is the resonant frequency. The resonant circuit is also connected to an external load transducer.
[0030] The controller is connected to the filter circuit via a relay, and the controller's PWM pin is connected to the high-frequency inverter circuit via the PWM drive circuit. The controller is configured to:
[0031] The relay is turned on / off based on the detection signal;
[0032] And whether to enable the PWM drive of the controller.
[0033] In this embodiment, the grid input is first processed by the rectifier circuit; the high-frequency inverter circuit is connected to the resonant circuit through a high-frequency transformer.
[0034] The PWM drive circuit includes an IGBT driver chip, which amplifies the PWM (Pulse Width Modulation) signal generated by the microcontroller through its internal timer, thereby providing sufficient drive capability to drive the IGBT to alternately turn on the upper and lower bridge arms according to the control signal, realizing the DC to AC conversion.
[0035] Reference Figure 1 The power grid serves as the initial input, outputting to the rectifier stage. The rectifier circuit receives the power grid input and outputs to the filter stage. The filter circuit receives the rectified input and outputs to the high-frequency inverter circuit. Simultaneously, the high-frequency inverter receives the filtered input and outputs to the high-frequency transformer stage. The high-frequency transformer receives the high-frequency inverter input and outputs to the resonant circuit stage. The resonant circuit receives the high-frequency transformer input and outputs to the load transducer stage. Its state is detected and fed back to the controller by the ADC. The controller outputs PWM, which controls the high-frequency inverter circuit through the PWM drive circuit. It receives the ADC detection signal and also outputs a control signal (i.e.,...). Figure 2 The SW signal in the circuit enables frequency tracking on / off and adds a 50Hz modulation wave (after disconnecting the filter circuit, it is equivalent to introducing the frequency of the external AC power supply, which superimposes a 50Hz frequency on the original high frequency, generating an up-and-down force when screening materials, thereby improving screening efficiency).
[0036] It should be noted that, by utilizing the principle that "circuit voltage characteristics will exhibit extreme values (maximum or minimum values) under resonant conditions," the frequency corresponding to the voltage extreme value can be found by measuring the voltage values at different frequencies; this is the resonant frequency. This method is widely used in the debugging of existing ultrasonic systems (such as transducer matching in ultrasonic sieving generators). The core principle is to deduce the frequency by using the abrupt change in voltage characteristics at resonance.
[0037] The working principle of this scheme is as follows: After the mains power (usually 220V AC) is input, it first passes through a rectifier and filter circuit to convert the AC power into a relatively stable DC power. This is usually accomplished using a bridge rectifier and a large-capacity capacitor to obtain a relatively smooth DC voltage. Then, this DC voltage enters the high-frequency inverter circuit, where the inverter, composed of power switching devices (such as MOSFETs or IGBTs), converts the DC power into high-frequency AC power. We use a relatively smooth DC power in the initial stage of frequency tracking to track the accurate frequency. After frequency tracking is completed, the filter circuit is disconnected. At this time, the high-frequency power of the subsequent stage will be superimposed with the 50Hz mains power. The high-frequency AC power is then sent to the resonant circuit and the high-frequency transformer to ensure that the energy is efficiently transferred to the next stage load.
[0038] In application, the high-frequency inverter circuit is a mature existing technology, therefore, its diagram is not shown; the controller adopts a microcontroller, such as STM32F334, which supports logic operations, PWM output, input capture and other functions, which should be well known to those skilled in the art, and will not be described in detail here.
[0039] In implementation, a driving device is also connected between the controller and the relay. The controller controls the power supply to the relay through the driving device, thereby enabling or disabling the filtering circuit. The driving device is a transistor.
[0040] Furthermore, the resonant circuit includes a resonant inductor and multiple resonant capacitors; its specific connection structure is as follows. Figure 3 As shown; Figure 3 ADC1 and ADC2 are connected to the microcontroller to enable ADC detection; the load interface indicates connection to an external load transducer.
[0041] In this embodiment, the controller is also connected to an external interactive device via a communication interface.
[0042] The interactive devices include HMIs, industrial control computers, etc.; they can communicate via 485 or MODBUS RTU, and there are no restrictions on this.
[0043] The above scheme obtains the correct resonant frequency through ADC detection, and after automatically tracking the resonant frequency of the screen, it activates the PWM drive of the controller and disconnects the filter circuit through a relay. This allows the screening generator to operate with a 50Hz modulation wave from the power input on top of the resonant frequency, which can significantly improve the screening effect. At the same time, because it operates at the resonant position, it achieves the best effect with relatively low power.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. An ultrasonic sieving system applied to an ultrasonic sieving generator, characterized by, It includes rectifier circuits, filter circuits, PWM drive circuits, high-frequency inverter circuits, resonant circuits, and controllers; The rectifier circuit is connected to the filter circuit and the high-frequency inverter circuit respectively; The controller's ADC channel is connected to the resonant circuit to acquire the collected detection signal, and the frequency tracking is achieved based on the frequency corresponding to the voltage extreme value in the detection signal, which is the resonant frequency. The resonant circuit is also connected to an external load transducer. The controller is connected to the filter circuit via a relay, and the controller's PWM pin is connected to the high-frequency inverter circuit via the PWM drive circuit. The controller is configured to: The relay is turned on / off based on the detection signal; And whether to enable the PWM drive of the controller.
2. The ultrasonic screening system of claim 1, wherein, The controller is a microcontroller.
3. The ultrasonic screening system of claim 1, wherein, A driving device is also connected between the controller and the relay. The controller controls the power supply to the relay through the driving device, thereby enabling or disabling the filtering circuit.
4. The ultrasonic screening system of claim 3, wherein, The driving device uses a transistor.
5. The ultrasonic screening system of claim 4, wherein, The high-frequency inverter circuit is connected to the resonant circuit via a high-frequency transformer.
6. The ultrasonic screening system of claim 5, wherein, The resonant circuit includes a resonant inductor and multiple resonant capacitors.
7. The ultrasonic screening system according to any one of claims 1 to 6, characterized in that, The controller also connects to external interactive devices via a communication interface.