High-frequency high-voltage high-power alternating-current power supply generating system
Through the SPWM method of synthesizing sine wave and multipole filtering networks, the transducer matching problem in ultrasonic power supplies is solved, and the stable output of high-frequency, high-voltage, high-power AC power supply and dynamic matching of transducer frequency are achieved, extending the equipment life.
Patent Information
- Application Number
- CN202420771658.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-15
AI Technical Summary
The existing ultrasonic power supply generates high-frequency, high-voltage, high-power sinusoidal power supply through LC resonance method, which has problems with transducer matching, resulting in low working efficiency, severe heating, unstable output, and the inductor capacitance components cannot be adjusted simultaneously to match the transducer. Frequency changes.
Using SPWM to synthesize sine waves and match the multi-pole filtering network, a high-frequency, high-voltage, and high-power AC power supply is generated through the controller, CNC power supply module, drive module and inverter processing module to achieve dynamic matching of ultrasonic transducer frequency , reduce the working noise and heating of the transducer.
It realizes the stable output of high-frequency, high-voltage, high-power AC power supply, reduces the working noise and heat generation of the transducer, extends the service life of the transducer, and does not need to match the LC resonant component parameters.
Smart Images
Figure CN222283070U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electronic technology, in particular to a high-frequency, high-voltage and high-power AC power generation system. Background Art
[0002] Existing ultrasonic power supplies all use the LC resonant circuit method to generate high-frequency, high-voltage, and high-power sinusoidal power. This method has a simple structure and low cost, but has many defects.
[0003] Using LC resonance to generate the driving source requires matching the inductor and capacitor elements according to the operating frequency of the transducer. The transducer is a consumable part of an ultrasonic system and needs to be replaced frequently during use. Different transducers also need to be matched for different working scenarios. At this time, the inductor and capacitor elements inside the power supply cannot be replaced synchronously with the replacement of the transducer. As a result, the optimal matching state cannot always be achieved during operation, which will lead to low working efficiency of the transducer, and the output power will not meet expectations. The entire system will also generate severe heat, and the heat generated during operation will change the characteristics of the capacitor and inductor elements, which will lead to a shift in the resonant frequency, further aggravating the mismatch of parameter matching and reducing working efficiency and output energy.
[0004] An ultrasonic transducer is a component that converts electrical energy into mechanical energy. It has an optimal frequency of mechanical vibration. This frequency will change depending on the transducer itself, the temperature of the component itself, and the load on the transducer. The ultrasonic power supply must correspond to this frequency when matching to maximize the transducer's working efficiency and minimize heat generation while maximizing energy output. However, this frequency is constantly changing, and the matching components in the ultrasonic power supply cannot be adjusted at any time. Some ultrasonic power supplies will design an adjustable inductor in the circuit, which can be manually adjusted to compensate for the changing parameters. However, the frequency of the ultrasonic transducer is constantly changing during operation, and the adjustable inductor cannot be automatically adjusted in sync with the changes. This will still cause the LC parameters to lose matching, and the ultrasonic transducer will generate heat and noise when working, resulting in unstable output and large fluctuations in output energy.
[0005] Therefore, there is an urgent need to provide a high-frequency, high-voltage, and high-power AC power generation system to overcome the above-mentioned defects. Utility Model Content
[0006] The main purpose of the utility model is to provide a high-frequency, high-voltage, and high-power AC power generation system, which uses SPWM to synthesize sine waves and match a multi-pole filter network to generate a high-frequency, high-voltage, and high-power AC power supply to match the needs of an ultrasonic transducer.
[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0008] High frequency, high voltage and high power AC power generation system, used in ultrasonic generators, including:
[0009] Controller: used to feedback corresponding instructions according to the received signal;
[0010] Digital control power supply module: provides DC power supply according to the transmission instructions of the controller;
[0011] Driving module: generating a corresponding on / off signal according to the PWM signal of the controller;
[0012] Inverter processing module: performs corresponding on / off operation according to the corresponding on / off signal, compares the reference level output after filtering and amplification and compares the sampling point level when on, feeds back the signal to the controller to start the protection function when abnormal, and converts the DC voltage provided by the CNC power supply module into a high-frequency AC power supply to drive the ultrasonic generator to work.
[0013] Preferably, the inversion processing module includes:
[0014] A plurality of switch tube units are respectively connected to the driving module and the transformer in bridge arms, a group of switch tube units at a diagonal of the bridge arm are turned on at the same time, and two groups of switch tube units at a diagonal are turned on in turn;
[0015] A filter unit that amplifies and filters the bridge arm signal and the overcurrent detection comparison level / short-circuit detection comparison level transmitted by the power supply terminal module;
[0016] When it is determined by comparison that the current of the switch tube unit exceeds the upper limit, or when the switch tube unit is broken down and damaged and short-circuited, a feedback signal is sent to the comparison and judgment unit of the controller to trigger a protection action.
[0017] Preferably, each of the bridge arm signal and power supply terminal modules includes: terminal one for providing a driving signal, an alarm comparison level and a feedback alarm signal for a bridge arm, and terminal two for providing a bridge arm with a power supply of +20V and +5V isolated from other parts, and a common ground of 0V; terminal two is connected to the bridge arm power supply circuit.
[0018] Preferably, each of the bridge arm power supply circuits includes a voltage conversion chip that converts a +20V voltage into a +15V voltage and provides it to the corresponding bridge arm as a high logic reference level, and an LED indicator light that lights up when the voltage conversion chip generates a +15V voltage normally.
[0019] Preferably, each of the switch tube units includes a MOSFET and an RC absorption circuit, and is turned on when the connected PWM signal is at a high level.
[0020] Preferably, each of the filtering units comprises two filtering circuits, one filtering circuit amplifies and filters the output of the overcurrent detection comparison level; and the other filtering circuit amplifies and filters the output of the short circuit detection comparison level.
[0021] Preferably, each of the comparison and judgment units includes two comparison and judgment circuits, and each of the comparison and judgment circuits is connected to the switch tube unit via a diode; when the switch tube unit is disconnected, the two diodes are not conductive; when the switch tube unit is conductive, the two diodes are conductive.
[0022] Preferably, both comparison and judgment circuits are equipped with indicator lights, and when the switch tube unit is broken down, damaged, or short-circuited, and the current of the switch tube unit exceeds an upper limit, the corresponding indicator lights perform corresponding on / off operations.
[0023] Preferably, the digital control power supply module comprises a bus voltage positive input terminal current sampling circuit connected to the controller, the drive module and the inverter processing module.
[0024] Preferably, the current sampling circuit at the positive input end of the bus voltage includes a Hall sensor that converts the current into an analog value and transmits it back to the controller through a terminal.
[0025] The beneficial effects of the high-frequency, high-voltage, and high-power AC power generation system of the utility model are as follows: the controller instructs the driving module to generate a corresponding on / off signal to turn on or off the corresponding on switch of the inverter processing module, and the inverter processing module feeds back a short-circuit and overcurrent signal to the controller when it is turned on / off, and the controller issues a protection instruction to instruct the circuit to perform a circuit protection function. At the same time, the inverter processing module generates a high-frequency AC power supply to drive the ultrasonic generator to work, thereby achieving the requirements of generating a high-frequency, high-voltage, and high-power AC power supply to match the ultrasonic transducer. There is no need to match the parameters of the LC resonant element, and only the driving source signal needs to be controlled to ensure the voltage amplitude and driving capability of the driving power supply within a certain frequency range. When the ultrasonic transducer is driven to work using this solution, the frequency can be conveniently adjusted to match the mechanical frequency of the transducer, thereby reducing the working noise and heat of the transducer, ensuring the stability of the output energy, and extending the service life of the transducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a module block diagram of an embodiment of a high-frequency, high-voltage, and high-power AC power generation system of the utility model.
[0027] Figure 2 FIG. 1 is a circuit diagram of an embodiment of the utility model.
[0028] Figure 3 for Figure 2Circuit diagram of the bridge arm signal and power supply terminal module in the middle bridge arm.
[0029] Figure 4 for Figure 2 Schematic diagram of the circuit of the driving unit of one bridge arm.
[0030] Figure 5 for Figure 2 Circuit diagram of the switch tube unit in one bridge arm.
[0031] Figure 6 for Figure 2 A circuit diagram of the filter unit and the comparison and judgment unit of a bridge arm.
[0032] Figure 7 for Figure 2 The power supply circuit diagram of the middle bridge arm.
[0033] Figure 8 for Figure 2 Schematic diagram of the current sampling circuit at the positive input end of the bus voltage.
[0034] Fig. 9 for Figure 2 Schematic diagram of the circuit of the bridge arm signal and power supply terminal module of the other bridge arm.
[0035] Fig.10 for Figure 2 Schematic diagram of the circuit of the driving unit of the other bridge arm.
[0036] Fig.11 for Figure 2 Schematic diagram of the circuit of the switch tube unit in the other bridge arm.
[0037] Fig.12 for Figure 2 A circuit diagram of the filter unit and the comparison and judgment unit of the other bridge arm.
[0038] Fig.13 for Figure 2 The power supply circuit diagram of the other bridge arm.
[0039] Fig.14 for Figure 3 Circuit diagram of the diagonal bridge arm signal and power supply terminal module.
[0040] Fig.15 for Figure 3 Schematic diagram of the circuit of the driver unit of the diagonal bridge arm.
[0041] Fig.16 for Figure 3 Circuit diagram of the switch tube unit of the diagonal bridge arm.
[0042] Fig.17 for Figure 3Circuit diagram of the filter unit and comparison and judgment unit of the diagonal bridge arm.
[0043] Fig.18 for Figure 3 Power supply circuit diagram of the diagonal bridge arm.
[0044] Fig.19 Fig. 9 Circuit diagram of the bridge arm signal and power supply terminal module of the diagonal bridge arm.
[0045] Fig. 20 for Fig. 9 Schematic diagram of the circuit of the driver unit of the diagonal bridge arm.
[0046] Fig.21 for Fig. 9 Circuit diagram of the switch tube unit of the diagonal bridge arm.
[0047] Fig. 22 for Fig. 9 Circuit diagram of the filter unit and comparison and judgment unit of the diagonal bridge arm.
[0048] Fig.23 for Fig. 9 Power supply circuit diagram of the diagonal bridge arm.
[0049] Description of Figure Numbers:
[0050] 1-controller, 2-CNC power supply module, 3-drive module, 4-inversion processing module, 41a / 41b / 41c / 41d-switch tube unit, 42a / 42b / 42c / 42d power supply terminal module, 43a / 43b / 43c / 43d-filter unit, 44a / 44b / 44c / 44d-comparison and judgment unit, 45a / 45b / 45c / 45d-bridge arm power supply circuit, 5-ultrasonic generator. DETAILED DESCRIPTION
[0051] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.
[0052] See also Figures 1 to 23The high-frequency, high-voltage, and high-power AC power generation system of this embodiment is applied to an ultrasonic filter 5, and includes: a controller 1 for feeding back corresponding instruction instructions according to a received signal, a digital control power module 2 for providing a DC power supply according to a transmission instruction of the controller 1, a driving module 3 for generating a corresponding on / off signal according to a PWM signal of the controller 1, and an inverter processing module 4 for performing a corresponding on or off operation according to the corresponding on / off signal, comparing and judging the reference level output after filtering and amplification and comparing the sampling point level when on, feeding back a signal to the controller 1 to start a protection function when abnormal, and converting the voltage provided by the digital control power module 2 into a high-frequency AC power supply to drive the ultrasonic generator 5 to work.
[0053] Wherein, the inverter processing module 4 includes: a plurality of switch tube units 41a / 41b / 41c / 41d connected to the driving module 3 and the transformer A in bridge arms, respectively; a group of the switch tube units 41a and the switch tube unit 41c or the switch tube unit 41b and the switch tube unit 41d diagonally opposite to the bridge arm are turned on at the same time, and the two groups of the switch tube units 41a / 41b / 41c / 41d are turned on in turn; a filter unit 43a / 43b / 43c / 43d amplifies and filters the overcurrent detection comparison level / short-circuit detection comparison level transmitted by the bridge arm signal and the power supply terminal module 42a / 42b / 42c / 42d, and each of the filter units 43a / 43b / 43c / 43d includes two filter circuits, one of which amplifies and filters the overcurrent detection comparison level; the other filter circuit amplifies and filters the short-circuit detection comparison level; when the comparison determines that the switch tube unit 41 When the current of a / 41b / 41c / 41d exceeds the upper limit, or when the switch tube unit 41a / 41b / 41c / 41d breaks down and is damaged by short circuit, a feedback signal is sent to the comparison and judgment unit 44a / 44b / 44c / 44d of the controller 1 to trigger the protection action. Each of the comparison and judgment units 44a / 44b / 44c / 44d includes two comparison and judgment circuits, and each of the comparison and judgment circuits is connected to the corresponding switch tube unit 41a / 41b / 41c / 41d via a diode; when the switch tube unit 41a / 41b / 41c / 41d is disconnected, the two diodes are not turned on; when the switch tube unit 41a / 41b / 41c / 41d is turned on, the two diodes are turned on. Each of the switch tube units 41a / 41b / 41c / 41d includes a MOSFET and an RC absorption circuit, and is turned on when the connected PWM signal is at a high level. Both comparison and judgment circuits are equipped with indicator lights. When the switch tube unit 41a / 41b / 41c / 41d of the corresponding bridge arm breaks down and is damaged and short-circuited, and the current of the corresponding switch tube unit 41a / 41b / 41c / 41d exceeds the upper limit, the corresponding indicator light performs the corresponding on / off operation. Specifically, each of the bridge arm signal and power supply terminal modules 42a / 42b / 42c / 42d includes: terminal one for providing a driving signal, an alarm comparison level and a feedback alarm signal for a bridge arm, and terminal two for providing a bridge arm with a power supply of +20V and +5V isolated from other parts, and a common ground of 0V; terminal two is connected to the bridge arm power supply circuit 45a / 45b / 45c / 45d, and each of the bridge arm power supply circuits 45a / 45b / 45c / 45d includes a voltage conversion chip that converts the +20V voltage into a +15V voltage and provides it to the corresponding bridge arm as a high logic reference level, and an LED indicator light that lights up when the voltage conversion chip generates +15V voltage normally.It should be noted that each of the bridge arms corresponds to a driving circuit 31 a / 31 b / 31 c / 31 d of the driving module 3 .
[0054] The digital control power supply module 2 includes a bus voltage positive input terminal current sampling circuit 21 connected to the controller 1, the drive module 3 and the inverter processing module 4. The bus voltage positive input terminal current sampling circuit 21 includes a Hall sensor that converts the current size into an analog quantity and transmits it back to the controller through the terminal.
[0055] It should be noted that the controller 1 is an application of the prior art, so it is not described in detail here.
[0056] In this embodiment, Figure 3-Figure 7A bridge arm structure is formed, and terminal S5 provides the bridge arm with power supplies of +20V and +5V isolated from other parts, and shares a common ground of 0V. Terminal S9 provides the bridge arm with a driving signal, an alarm comparison level, and a feedback alarm signal. The controller 1 drives the voltage conversion chip 32 to convert the +20V voltage into a +15V voltage and provide it to the corresponding bridge arm as a high logic reference level. Terminal S9 inputs a driving signal PWM1A to the driving chip U42. When the logic is high, the driving chip U42 outputs +20V, and when the logic is low, it outputs 0V. When the driving signal is high, +20V is output to the G pole of the power MOSFET tube Q3 through R126 and R127. Since D15 is reversely cut off at this time, R124 and R125 are disconnected, and the S pole of the MOS tube Q3 is connected to +5V. At this time, when the high level is turned on, the GS voltage of the MOSFET tube Q3 is +15V, and this switch tube is turned on, and D and S are connected. When the driving signal is low, 0V is added to D15, and the S pole of Q3 is +5V, then the voltage between GS of Q3 is -5V, and D15 is forward-conducted, and the current flows through R124, R125, R126, and R127. At this time, Q3 is turned off, and there is no conduction between D and S. Synchronously, terminal S9 inputs the short-circuit detection comparison level OCS1 to the filter circuit of op amp U5, and after amplification and filtering, the OCSV1 signal is output to the comparator U18. Under the normal shutdown level: when the power tube Q3 is normally turned off, OCA1 is pulled up to +20V by Z31, and the positive end of D1 is 0V, which is equivalent to being disconnected, and the negative end of D9 is floating and not conducting. At this time, OCA1 is +20V, compared with the comparison level OCSV1, when the OCSV1 voltage is appropriate, the comparison result EIS1 is high, and the indicator L24 is not on.When the power MOS tube Q3 is damaged and short-circuited, the negative end of D9 is directly connected to +5V. At this time, OCA1 is pulled down to +5V plus the forward conduction voltage drop level of D9. At this time, it is compared with OCSV1. When the voltage of OCSV1 is appropriate, the comparison result EIS1 is low, and the indicator light L24 is on. At this time, EIS1 is fed back to the controller 1 through the terminal S9 to trigger the protection action; synchronously, the terminal S9 inputs the overcurrent detection comparison level OPS1 to the filter circuit of the operational amplifier U6, and after amplification and filtering, the OPSV1 signal is output to the comparator U17. When the drive signal PWM1A is low, U42 outputs 0V, the power tube Q3 is normally turned off, and OPA1 is also 0V. Compared with the comparison level OPSV1, when the voltage of OPSV1 is appropriate, At this time, the comparison result GH1 is low, and the indicator light L20 is on. When the drive signal PWM1A is high, U42 outputs +20V, the power MOS tube Q3 is turned on, and the OPA1 level is +5V plus the forward conduction voltage of D9, plus the forward conduction voltage of D1, plus the internal resistance Rds(on) of Q3 multiplied by the current Id through Q3 to get Vds(on). When the current Id through Q3 exceeds the upper limit of protection, Vds(on) will be high, and the voltage of OPA1 will exceed OPSV1. At this time, GH1 is high, the indicator light L20 is off, and GH1 is fed back to the controller 1 through the terminal S9 to trigger the protection action. At the same time, the high-frequency AC power output is sent to the ultrasonic generator 5 to drive the ultrasonic generator 5 to work. It should be noted that. Figure 9-13 The bridge arm structure is composed of Figure 14-18 The bridge arm structure composed of Figure 19-Figure 23 Please refer to the working principle of Figure 3-Figure 7 The working principle of a bridge arm structure is similar and will not be elaborated here. The driving signals PWM1A and PWM1B, PWM2A and PWM2B are sent out complementary to each other, and PWM1A and PWM2B are sent out in phase, so that the bridge arms are opened diagonally at the same time. By controlling the PWM signal, the bridge arms are opened diagonally in turn, so that the voltage polarity output by the output terminal is switched periodically, thereby achieving the purpose of generating high-frequency, high-voltage and high-power AC power supply to match the needs of the ultrasonic transducer.
[0057] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A high-frequency, high-voltage, high-power AC power generation system, characterized in that: Applicable to ultrasonic generators, including: Controller: used to feedback corresponding instructions according to the received signal; Digital control power supply module: provides DC power supply according to the transmission instructions of the controller; Driving module: generating a corresponding on / off signal according to the PWM signal of the controller; Inverter processing module: performs corresponding on / off operation according to the corresponding on / off signal, compares the reference level output after filtering and amplification and compares the sampling point level when on, feeds back the signal to the controller to start the protection function when abnormal, and converts the DC voltage provided by the CNC power supply module into a high-frequency AC power supply to drive the ultrasonic generator to work.
2. The high-frequency, high-voltage, high-power AC power generation system according to claim 1, characterized in that: The inversion processing module includes: A plurality of switch tube units are respectively connected to the driving module and the transformer in bridge arms, a group of switch tube units at a diagonal of the bridge arm are turned on at the same time, and two groups of switch tube units at a diagonal are turned on in turn; A filter unit that amplifies and filters the bridge arm signal and the overcurrent detection comparison level / short-circuit detection comparison level transmitted by the power supply terminal module; When it is determined by comparison that the current of the switch tube unit exceeds the upper limit, or when the switch tube unit is broken down and damaged and short-circuited, a feedback signal is sent to the comparison and judgment unit of the controller to trigger a protection action.
3. The high-frequency, high-voltage, high-power AC power generation system according to claim 2, characterized in that: Each of the bridge arm signal and power supply terminal modules includes: terminal one for providing a driving signal, an alarm comparison level and a feedback alarm signal for a bridge arm, and terminal two for providing a bridge arm with a power supply of +20V and +5V isolated from other parts, and a common ground of 0V; terminal two is connected to the bridge arm power supply circuit.
4. The high-frequency, high-voltage, high-power AC power generation system according to claim 3, characterized in that: Each of the bridge arm power supply circuits includes a voltage conversion chip that converts a +20V voltage into a +15V voltage and provides it to the corresponding bridge arm as a high logic reference level, and an LED indicator light that lights up when the voltage conversion chip generates a +15V voltage normally.
5. The high-frequency, high-voltage, high-power AC power generation system according to claim 2, characterized in that: Each of the switch tube units includes a MOSFET and an RC absorption circuit, and is turned on when the connected PWM signal is at a high level.
6. The high-frequency, high-voltage, high-power AC power generation system according to claim 2, characterized in that: Each of the filter units comprises two filter circuits, one of which amplifies and filters the output of an overcurrent detection comparison level; and the other of which amplifies and filters the output of a short circuit detection comparison level.
7. The high-frequency, high-voltage, high-power AC power generation system according to any one of claims 2 to 6, characterized in that: Each of the comparison and judgment units includes two comparison and judgment circuits, and each of the comparison and judgment circuits is connected to the switch tube unit via a diode; when the switch tube unit is disconnected, the two diodes are not conductive; when the switch tube unit is conductive, the two diodes are conductive.
8. The high-frequency, high-voltage, high-power AC power generation system according to claim 7, characterized in that: Both comparison and judgment circuits are equipped with indicator lights. When the switch tube unit is broken down, damaged, or short-circuited, or the current of the switch tube unit exceeds an upper limit, the corresponding indicator lights perform corresponding on / off operations.
9. The high-frequency, high-voltage, high-power AC power generation system according to claim 1, characterized in that: The digital control power supply module comprises a bus voltage positive input terminal current sampling circuit connected to the controller, the drive module and the inversion processing module.
10. The high-frequency, high-voltage, high-power AC power generation system according to claim 9, characterized in that: The bus voltage positive input terminal current sampling circuit includes a Hall sensor that converts the current magnitude into an analog quantity and transmits it back to the controller through a terminal.