High-power ultrasonic power supply

Abstract

The utility model discloses a high-power ultrasonic power supply, which is characterized in that alternating current in a mains supply network is converted into direct current through a full-bridge rectifier circuit, and then the rectified direct current is converted into smooth direct current through a filter circuit; then, the inverter circuit converts direct current into square wave alternating current under the control of the controller and the IGBT driver, then the square wave alternating current is converted into sine alternating current through the transformer, and the power supply is transmitted to the transducer through the impedance matching circuit; the controller controls the output frequency of the power supply through the IGBT driver according to the collected phase information of the transducer; meanwhile, the input power of the point cloud is controlled through the rectification driving unit. According to the utility model, frequency control and power supply control are separated, interference can be effectively reduced, tail end control is stable, and control difficulty is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic power supplies, in particular to a high-power ultrasonic power supply. Background Art

[0002] Ultrasonic demulsification is achieved by resonating the ultrasonic power supply with the transducer to generate mechanical vibrations in the emulsion. Currently, the ultrasonic power supplies on the market are generally used for low-power applications (cleaning, emulsification, etc.) or high-power pulse applications (welding, etc.). These power supplies do not meet the high-power continuous operation requirements required for ultrasonic demulsification.

[0003] The current ultrasonic power supply structure is generally that the power supply is rectified and filtered by a full-bridge or half-bridge to convert AC into DC. Then the DC is converted into a square wave of the required frequency through a phase shift circuit, and then converted into the sinusoidal AC required by the transducer through a transformer and filtering. The system tracks the resonant frequency of the transducer through phase detection.

[0004] However, during the application process, it was found that after the power changed, the waveform would generate a lot of interference signals, making tracking difficult, and detuning would occur after long-term application. Summary of the invention

[0005] The utility model provides a high-power ultrasonic power supply to overcome the above technical problems.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A high-power ultrasonic power supply, including a full-bridge rectifier circuit, a filter circuit, an inverter circuit, a transformer, an impedance matching circuit, a transducer, a signal acquisition module, a controller, an IGBT driver, and a rectifier drive unit;

[0008] The full-bridge rectifier circuit is connected to the mains;

[0009] The input end of the filter circuit is connected to the output end of the full-bridge rectifier circuit;

[0010] The input end of the inverter circuit is connected to the output end of the controller and the filter circuit; the input end of the inverter circuit is also connected to an IGBT driver, and the IGBT driver is connected to the controller;

[0011] The input end of the transformer is connected to the output end of the inverter circuit;

[0012] The input end of the impedance matching circuit is connected to the output end of the transformer, and the output end of the impedance matching circuit is connected to the transducer;

[0013] The controller is connected to the impedance matching circuit via a signal acquisition module;

[0014] The full-bridge rectifier circuit is also connected to the controller via a rectifier drive unit.

[0015] Further, the full-bridge rectifier circuit includes a U-phase connecting branch, a V-phase connecting branch, and a W-phase connecting branch;

[0016] The U-phase connecting branch, the V-phase connecting branch, and the W-phase connecting branch are connected in parallel, and the U-phase connecting branch, the V-phase connecting branch, and the W-phase connecting branch are respectively connected to the U-phase, V-phase, and W-phase of the mains;

[0017] The U-phase connecting branch includes a first thyristor G1, a second thyristor G2, a first capacitor C1, a first resistor R1, a second capacitor C2, and a second resistor R2;

[0018] The first capacitor C1 and the first resistor R1 are connected in series, the other end of the first capacitor C1 is connected to the anode of the first thyristor G1, and the other end of the first resistor R1 is connected to the cathode of the first thyristor G1;

[0019] The second capacitor C2 is connected in series with the second resistor R2, the other end of the second capacitor C2 is connected to the anode of the second thyristor G2, and the other end of the second resistor R2 is connected to the cathode of the second thyristor G2;

[0020] The cathode of the first thyristor G1 is connected to the anode of the second thyristor G2;

[0021] The gate of the first thyristor G1 and the gate of the second thyristor G2 are both connected to the rectification driving unit;

[0022] The U phase of the mains is connected to the connection point between the cathode of the first thyristor G1 and the anode of the second thyristor G2;

[0023] The circuit structures of the U-phase connecting branch, the V-phase connecting branch and the W-phase connecting branch are the same.

[0024] Further, the filtering circuit includes a third capacitor C3 and a third resistor R3 connected in parallel;

[0025] Two ends of the third capacitor C3 are connected to two ends of the full-bridge rectifier circuit respectively.

[0026] Further, the inverter circuit includes a first IGBT transistor Q1, a second IGBT transistor Q2, a third IGBT transistor Q3, and a fourth IGBT transistor Q4;

[0027] The source of the first IGBT transistor Q1 is connected to one end of the full-bridge rectifier circuit, the drain of the first IGBT transistor Q1 is connected to the source of the second IGBT transistor Q2, and the drain of the second IGBT transistor Q2 is connected to the other end of the full-bridge rectifier circuit;

[0028] The source of the third IGBT transistor Q3 is connected to one end of the full-bridge rectifier circuit, the drain of the third IGBT transistor Q3 is connected to the source of the fourth IGBT transistor Q4, and the drain of the fourth IGBT transistor Q4 is connected to the other end of the full-bridge rectifier circuit;

[0029] The drain of the first IGBT transistor Q1 is connected to one end of the transformer; the drain of the third IGBT transistor Q3 is connected to the other end of the transformer;

[0030] The gates of the first IGBT transistor Q1 , the second IGBT transistor Q2 , the third IGBT transistor Q3 and the fourth IGBT transistor Q4 are all connected to the IGBT driver.

[0031] Further, the impedance matching circuit includes an inductor L and a fourth capacitor C4;

[0032] One end of the inductor L is connected to one end of the transformer, and the other end is connected to the transducer;

[0033] One end of the fourth capacitor C4 is connected to the connection between the inductor L and the fourth capacitor C4, and the other end is connected to the other end of the transformer;

[0034] The other end of the transducer is connected to the other end of the transformer.

[0035] Beneficial effects: The utility model is a high-power ultrasonic power supply, which converts the AC power in the mains into DC power through a full-bridge rectifier circuit, and then converts the rectified DC power into smooth DC power through a filter circuit; then the inverter circuit, under the control of the controller and the IGBT driver, converts the DC power into square-wave AC power, and then converts the square-wave AC power into sinusoidal AC power through a transformer, and transmits the power to the transducer through an impedance matching circuit; then the controller controls the output frequency of the power supply through the IGBT driver according to the collected phase information of the transducer; and at the same time, the input power of the point cloud is controlled through the rectifier drive unit. The utility model separates frequency control from power control, which can effectively reduce interference, stabilize the terminal control, and greatly reduce the difficulty of control. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 This is a structural block diagram of a high-power ultrasonic power supply of the utility model;

[0038] Figure 2 This is a schematic diagram of an ultrasonic power supply circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] This embodiment provides a high-power ultrasonic power supply, such as Figure 1 , including a full-bridge rectifier circuit 1, a filter circuit 2, an inverter circuit 3, a transformer 4, an impedance matching circuit 5, a transducer 6, a signal acquisition module 7, a controller, an IGBT driver, and a rectifier drive unit;

[0041] The full-bridge rectifier circuit 1 is connected to the mains to convert the alternating current in the mains to direct current;

[0042] The input end of the filter circuit 2 is connected to the output end of the full-bridge rectifier circuit 1, so that the rectified direct current can be converted into smooth direct current through the filter circuit;

[0043] The input end of the inverter circuit 3 is connected to the output end of the controller and the filter circuit 2; the input end of the inverter circuit 3 is also connected to the IGBT driver, and the IGBT driver is connected to the controller; under the control of the controller and the IGBT driver, the inverter circuit converts direct current into square wave alternating current;

[0044] The input end of the transformer 4 is connected to the output end of the inverter circuit 3, so that the square wave AC is converted into sinusoidal AC through the transformer;

[0045] The input end of the impedance matching circuit 5 is connected to the output end of the transformer 4, and the output end of the impedance matching circuit 5 is connected to the transducer 6; the power is transmitted to the transducer 6 through the impedance matching circuit 5;

[0046] The controller is connected to the impedance matching circuit 5 through a signal acquisition module 7; wherein the signal acquisition module 7 acquires phase information of the transducer 6, and the controller controls the output frequency of the power supply through the IGBT driver according to the acquired phase information;

[0047] The full-bridge rectifier circuit 1 is also connected to a controller via a rectifier drive unit to control the input power of the power supply by means of phase shift control.

[0048] Preferably, if Figure 2 As shown, the full-bridge rectifier circuit 1 includes a U-phase connecting branch, a V-phase connecting branch, and a W-phase connecting branch;

[0049] The U-phase connecting branch, the V-phase connecting branch, and the W-phase connecting branch are connected in parallel, and the U-phase connecting branch, the V-phase connecting branch, and the W-phase connecting branch are respectively connected to the U-phase, V-phase, and W-phase of the mains;

[0050] The U-phase connecting branch includes a first thyristor G1, a second thyristor G2, a first capacitor C1, a first resistor R1, a second capacitor C2, and a second resistor R2;

[0051] The first capacitor C1 and the first resistor R1 are connected in series, the other end of the first capacitor C1 is connected to the anode of the first thyristor G1, and the other end of the first resistor R1 is connected to the cathode of the first thyristor G1;

[0052] The second capacitor C2 is connected in series with the second resistor R2, the other end of the second capacitor C2 is connected to the anode of the second thyristor G2, and the other end of the second resistor R2 is connected to the cathode of the second thyristor G2;

[0053] The cathode of the first thyristor G1 is connected to the anode of the second thyristor G2;

[0054] The gate of the first thyristor G1 and the gate of the second thyristor G2 are both connected to the rectification driving unit;

[0055] The U phase of the mains is connected to the connection point between the cathode of the first thyristor G1 and the anode of the second thyristor G2;

[0056] The circuit structures of the U-phase connecting branch, the V-phase connecting branch and the W-phase connecting branch are the same.

[0057] Preferably, the filter circuit 2 comprises a third capacitor C3 and a third resistor R3 connected in parallel;

[0058] Two ends of the third capacitor C3 are connected to two ends of the full-bridge rectifier circuit 1 respectively.

[0059] Preferably, the inverter circuit 3 includes a first IGBT transistor Q1, a second IGBT transistor Q2, a third IGBT transistor Q3, and a fourth IGBT transistor Q4;

[0060] The source of the first IGBT transistor Q1 is connected to one end of the full-bridge rectifier circuit 1, the drain of the first IGBT transistor Q1 is connected to the source of the second IGBT transistor Q2, and the drain of the second IGBT transistor Q2 is connected to the other end of the full-bridge rectifier circuit 1;

[0061] The source of the third IGBT transistor Q3 is connected to one end of the full-bridge rectifier circuit 1, the drain of the third IGBT transistor Q3 is connected to the source of the fourth IGBT transistor Q4, and the drain of the fourth IGBT transistor Q4 is connected to the other end of the full-bridge rectifier circuit 1;

[0062] The drain of the first IGBT transistor Q1 is connected to one end of the transformer 4; the drain of the third IGBT transistor Q3 is connected to the other end of the transformer 4;

[0063] The gates of the first IGBT transistor Q1 , the second IGBT transistor Q2 , the third IGBT transistor Q3 and the fourth IGBT transistor Q4 are all connected to the IGBT driver.

[0064] Specifically, the transformer is a conventional transformer in the field, such as Figure 2 As shown, it is not described in detail here.

[0065] Preferably, the impedance matching includes an inductor L and a fourth capacitor C4;

[0066] One end of the fourth inductor is connected to one end of the transformer 4, and the other end is connected to the transducer 6;

[0067] One end of the fourth capacitor is connected to the connection between the inductor L and the fourth capacitor C4, and the other end is connected to the other end of the transformer 4;

[0068] The other end of the transducer 6 is connected to the other end of the transformer 4;

[0069] Specifically, the signal acquisition module in this embodiment is a conventional product in the field, including a current signal acquisition module and a voltage signal acquisition module, and the current and voltage signals of the transducer are respectively acquired through the current signal acquisition module and the voltage signal acquisition module; and the current and voltage signals are transmitted to the controller.

[0070] Specifically, the controller, IGBT driver and rectifier drive unit in this embodiment are all utilizations of existing products in the field, and this embodiment only uses them to realize the functions of the ultrasonic power supply circuit of this embodiment.

[0071] Specifically, it also includes a first diode D1 and a second diode D2;

[0072] Two ends of the first diode D1 are respectively connected to two ends of the U-phase connecting branch;

[0073] One end of the second diode D2 is connected to the cathode of the second thyristor G2 , and the other end is connected to the drain of the second IGBT transistor Q2 .

[0074] Specifically, a fifth capacitor C5 is further included; the drain of the first IGBT transistor Q1 is connected to one end of the transformer through the fifth capacitor C5.

[0075] Specifically, the working principle of this embodiment is as follows:

[0076] After the entire ultrasonic power supply system is started, the phase information of the transducer is collected through the signal acquisition module and transmitted to the controller, and then the output frequency of the power supply is controlled by the IGBT driver. At the same time, the input power of the power supply is controlled by the rectifier drive unit using phase shift control. This embodiment separates the frequency control from the power supply control, which can effectively reduce interference, stabilize the terminal control, and greatly reduce the difficulty of control. In addition, the IGBT driver and the rectifier drive unit in this embodiment both use power devices greater than 5KW, can operate at a power greater than 5KW for a long time, can achieve continuous operation for 7*24 hours, and can automatically track the resonant frequency.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A high-power ultrasonic power supply, characterized in that: It includes a full-bridge rectifier circuit (1), a filter circuit (2), an inverter circuit (3), a transformer (4), an impedance matching circuit (5), a transducer (6), a signal acquisition module (7), a controller, an IGBT driver, and a rectifier drive unit; The full-bridge rectifier circuit (1) is connected to the mains; The input end of the filter circuit (2) is connected to the output end of the full-bridge rectifier circuit (1); The input end of the inverter circuit (3) is connected to the output end of the controller and the filter circuit (2); the input end of the inverter circuit (3) is also connected to an IGBT driver, and the IGBT driver is connected to the controller; The input end of the transformer (4) is connected to the output end of the inverter circuit (3); The input end of the impedance matching circuit (5) is connected to the output end of the transformer (4), and the output end of the impedance matching circuit (5) is connected to the transducer (6); The controller is connected to the impedance matching circuit (5) via a signal acquisition module (7); The full-bridge rectifier circuit (1) is also connected to the controller via a rectifier drive unit.

2. A high-power ultrasonic power supply according to claim 1, characterized in that: The full-bridge rectifier circuit (1) comprises a U-phase connecting branch, a V-phase connecting branch, and a W-phase connecting branch; The U-phase connecting branch, the V-phase connecting branch, and the W-phase connecting branch are connected in parallel, and the U-phase connecting branch, the V-phase connecting branch, and the W-phase connecting branch are respectively connected to the U-phase, V-phase, and W-phase of the mains; The U-phase connecting branch includes a first thyristor G1, a second thyristor G2, a first capacitor C1, a first resistor R1, a second capacitor C2, and a second resistor R2; The first capacitor C1 and the first resistor R1 are connected in series, the other end of the first capacitor C1 is connected to the anode of the first thyristor G1, and the other end of the first resistor R1 is connected to the cathode of the first thyristor G1; The second capacitor C2 is connected in series with the second resistor R2, the other end of the second capacitor C2 is connected to the anode of the second thyristor G2, and the other end of the second resistor R2 is connected to the cathode of the second thyristor G2; The cathode of the first thyristor G1 is connected to the anode of the second thyristor G2; The gate of the first thyristor G1 and the gate of the second thyristor G2 are both connected to the rectification driving unit; The U phase of the mains is connected to the connection point between the cathode of the first thyristor G1 and the anode of the second thyristor G2; The circuit structures of the U-phase connecting branch, the V-phase connecting branch and the W-phase connecting branch are the same.

3. A high-power ultrasonic power supply according to claim 1, characterized in that: The filter circuit (2) comprises a third capacitor C3 and a third resistor R3 connected in parallel; The two ends of the third capacitor C3 are respectively connected to the two ends of the full-bridge rectifier circuit (1).

4. A high-power ultrasonic power supply according to claim 1, characterized in that: The inverter circuit (3) comprises a first IGBT transistor Q1, a second IGBT transistor Q2, a third IGBT transistor Q3, and a fourth IGBT transistor Q4; The source of the first IGBT transistor Q1 is connected to one end of the full-bridge rectifier circuit (1), the drain of the first IGBT transistor Q1 is connected to the source of the second IGBT transistor Q2, and the drain of the second IGBT transistor Q2 is connected to the other end of the full-bridge rectifier circuit (1); The source of the third IGBT transistor Q3 is connected to one end of the full-bridge rectifier circuit (1), the drain of the third IGBT transistor Q3 is connected to the source of the fourth IGBT transistor Q4, and the drain of the fourth IGBT transistor Q4 is connected to the other end of the full-bridge rectifier circuit (1); The drain of the first IGBT transistor Q1 is connected to one end of the transformer (4); the drain of the third IGBT transistor Q3 is connected to the other end of the transformer (4); The gates of the first IGBT transistor Q1 , the second IGBT transistor Q2 , the third IGBT transistor Q3 and the fourth IGBT transistor Q4 are all connected to the IGBT driver.

5. A high-power ultrasonic power supply according to claim 1, characterized in that: The impedance matching circuit (5) comprises an inductor L and a fourth capacitor C4; One end of the inductor L is connected to one end of the transformer (4), and the other end is connected to the transducer (6); One end of the fourth capacitor C4 is connected to the connection point between the inductor L and the fourth capacitor C4, and the other end is connected to the other end of the transformer (4); The other end of the transducer (6) is connected to the other end of the transformer (4).

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