[0032] In order to explain the embodiments and technical solutions of the present invention more clearly, the technical solutions of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0033] See figure 1 , Is a schematic structural diagram of the capacitive load high-frequency and high-voltage power supply provided by Embodiment 1 of the present invention, in which the rectifier unit 1, the filter unit 2, the full-bridge inverter unit 3, the drive unit 4, the control unit 5 and the surge absorption unit 6;
[0034] The rectifier unit 1, the filter unit 2, and the full-bridge inverter unit 3 are electrically connected to the drive unit 4 and the control unit 5, respectively;
[0035] The surge absorption unit 6 is electrically connected to the rectifier unit 1.
[0036] Specifically, the filter unit 2 is arranged on the power backplane;
[0037] A fan is also arranged on the power baseboard, and a heat sink is arranged on the fan, and the rectifier unit 1, the full-bridge inverter unit 3 and the surge absorption unit 6 are installed on the heat sink.
[0038] Further, this embodiment also includes a DC blocking capacitor and an output terminal;
[0039] The DC blocking capacitor is electrically connected to the output terminal of the full-bridge inverter unit 3;
[0040] The output terminal is electrically connected with the output terminal of the full-bridge inverter unit 3 and the DC blocking capacitor.
[0041] Further, the filter unit 2 is composed of two sets of capacitors and inductors connected in parallel.
[0042] Further, the full-bridge inverter unit 3 is composed of two insulated gate bipolar transistor IGBT modules.
[0043] The IGBT module in the full-bridge inverter unit 3 is composed of two insulated gate bipolar transistors IGBT connected in series.
[0044] Further, this embodiment also includes a human-machine interface unit, which is electrically connected to the control unit 5.
[0045] Further, the filtering unit 2 further includes:
[0046] Voltage divider resistor, connected in series with AC contactor;
[0047] Two sets of output contacts of AC contactor are electrically connected in parallel;
[0048] The control unit 5 is electrically connected to the AC contactor, and controls the AC contactor to pull in.
[0049] See figure 2 , Is a schematic structural diagram of the capacitive load high-frequency and high-voltage power supply provided by Embodiment 2 of the present invention, in which the power supply consists of a rectifier unit 1, a full-bridge inverter unit 3, a filter unit 2, a drive unit 4, and a control unit 5, which are electrically connected in sequence. Discharge cell composition. The filter unit 2 is placed on the power backplane, and a fan is also arranged on the power backplane. The rectifier unit 1 and the full-bridge inverter unit 3 are installed on the upper part of the fan, and the upper part of the filter unit 2 is provided with a clamping plate. The clamping plate is equipped with a driving unit 4. Control unit 5. Surge absorption unit 6, rectifier unit 1, filter unit 2, full-bridge inverter unit 3, discharge unit and drive unit 4, boost unit and control unit 5 are electrically connected, and human-machine interface unit is electrically connected with control unit 5 , The uniquely designed drive unit 4 and the integrated circuit of the control unit 5 make the power box structure compact and improve the reliability of the power supply.
[0050] Further, this embodiment also includes a surge absorber plate with lightning protection, anti-vibration and passive absorption, a high-frequency and high-voltage transformer, and a DC blocking capacitor, which is electrically connected to the output terminal of the full-bridge inverter after IGBT chopping. , The output terminal of the blocking capacitor is connected to the output terminal.
[0051] In this embodiment, an independent input terminal, an output terminal, and an energy storage filter capacitor are included. The energy storage filter capacitor is connected to the output terminal of the IGBT chopped full-bridge inverter circuit, and the independent output terminal is connected to a high-voltage and high-frequency transformer.
[0052] In this embodiment, the control unit 5 and the driving unit 4 are included. The control unit 5 adopts a highly intelligent and stable digital circuit and is equipped with various protections such as overcurrent, overvoltage, undercurrent, undervoltage, and IGBT failure. .
[0053] In this embodiment, there are 4 sets of capacitors including filtering, full-wave energy storage, and buffering. There is 1 set of full-wave capacitors at both ends of the IGBT, 1 set in series with the output terminal after full-bridge inversion, and 1 set with An inductor is connected in series with the filter capacitor of the full-bridge inverter, and there is a group of buffer capacitors at both ends of the filter capacitor.
[0054] In this embodiment, among the surge absorption unit 6, the rectifier unit 1, the filter unit 2, the full-bridge inverter unit 3, the buffer unit, the drive unit 4, the control unit 5, and the man-machine interface unit that are electrically connected in sequence, the filter unit 2 Set on the power backplane, and also set a fan on the power backplane; install the rectifier unit 1 and the full bridge inverter unit 3 on the heat sink; the filter unit 2 and the full bridge inverter unit 3 are electrically connected to the control unit 5 and the drive unit 4; The rectifier unit 1, the filter unit 2, and the full-bridge inverter unit 3 are electrically connected with the drive unit 4 and the control unit 5, respectively; the man-machine interface unit is embedded outside the power box.
[0055] Further, the power supply also includes: a DC blocking capacitor, an incoming terminal and an output terminal; the DC blocking capacitor is electrically connected to the output terminal of the full-bridge inverter unit 3; the output terminal is electrically connected to the output terminal of the full-bridge inverter unit 3 and the DC blocking capacitor Phase electrical connection.
[0056] Further, the filter unit 2 is composed of two sets of parallel capacitor units and inductors electrically connected.
[0057] Further, the full-bridge inverter unit 3 is composed of two IGBT modules. The two sets of output contacts of the AC contactor are electrically connected in parallel and electrically connected with the voltage dividing resistor; the voltage dividing resistor and the AC contactor are connected in series and connected in parallel with the filter unit 2; the surge absorption unit 6 is installed at the inlet end of the power box, behind It is electrically connected to the rectifier unit 1; the man-machine interface unit is embedded outside the power box and is electrically connected to the control unit 5; the control unit 5 is electrically connected to the AC contactor, and the control unit 5 controls the AC contactor to pull in.
[0058] Further, a fan is installed under the rectifier unit 1, a dust cover is installed on the fan, and a hole is opened on the power supply base plate at the corresponding position of the fan.
[0059] Further, it also includes a buffer unit electrically connected to the control unit 5, including two capacitors electrically connected in parallel.
[0060] Specifically, the control unit 5, the drive unit 4 are electrically connected to the rectifier unit 1, the filter unit 2, and the full-bridge inverter unit 3 that are electrically connected in turn, wherein the filter unit 2 is arranged on the power backplane, and is also provided on the power backplane. Heat sink; rectifier unit 1 and full-bridge inverter unit 3 are arranged on the heat sink; the upper part of filter unit 2 and full-bridge inverter unit 3 are electrically connected to drive unit 4 and control unit 5, rectifier unit 1, filter unit 3, full Bridge inverter unit 2. The surge absorption unit 6 is installed on the rectifier unit 1 to suppress the high-order harmonics of the power supply line. To protect the rectifier unit and inverter unit.
[0061] The rectifier unit 1 is used to provide AC voltage, and the filter unit 2 is connected in series with the full-bridge inverter unit 3.
[0062] The filter unit 2 is used to reduce the pulsation of the AC voltage output by the rectifier unit 1, and the voltage divider resistor in the filter unit 2 slows down the impact on the inductance and acts as a protection circuit. The voltage divider resistor is connected in parallel with the AC contactor. When the capacitor and inductance are fully charged, the control board gets the signal to control the drive board, and the drive board drives the AC contactor to pull in, and the device runs normally.
[0063] The full-bridge inverter unit 3 is used to provide the high-frequency voltage required by the load to be electrically connected to the transformer.
[0064] See image 3 with Figure 4 , Is a schematic structural diagram of a capacitive load high-frequency and high-voltage power supply provided by Embodiment 3 of the present invention, image 3 with Figure 4 The capacitors C1 and C6 in the circuit are energy storage and resonant capacitors in the circuit. C4 and C5 are connected in parallel to the insulated gate bipolar transistors S1 and S2, which are connected in series. They are continuously charged and discharged to rectify the wave during operation. C2 and C3 It is electrically connected in parallel and connected in series at the output end of the full-bridge inverter unit to block DC.
[0065] The full-bridge inverter unit 4 includes two sets of IGBT modules, one IGBT module is composed of insulated gate bipolar transistors S1 and S3 connected in series, and the other IGBT module is composed of insulated gate bipolar transistors S2 and S4 connected in series.
[0066] See Figure 5 , Is a schematic diagram of the external human-machine interface of the capacitive load high-frequency and high-voltage power supply provided in Embodiment 4 of the present invention, Figure 5 The man-machine interface unit in is set outside the power supply, and is electrically connected to the control unit 5, and plays the role of adjusting frequency, current, voltage, and temperature.
[0067] Among them, in one embodiment, the rectifier unit 1 includes an XX-type rectifier bridge, a three-phase full bridge, with a rated current of XX and a rated voltage of XX. Each capacitor in the filter unit 2 has a capacitance value of XX and a withstand voltage value of XX, and is connected in series in pairs, and four groups are electrically connected in parallel. The model of IGBT module is infineon XX, the model of IGBT driver is XX, the driving signal is generated by DSP, the capacitance value of IGBT buffer capacitor (C94 and C5) is XX, the withstand voltage value is XX, adopting centralized configuration; its coil rated voltage is XX, the coil resistance is XX, resistor R2 limits the bus voltage when the current-limiting resistor is cut off by dividing the internal resistance of the DC relay coil. Resistor R1 mainly plays the role of current-limiting and dividing voltage. The resistance value is XX, and the rated power is XX. The charging time of C12; the eleventh capacitors C2 and C3 mainly play the role of blocking the direct current, the capacitance value is XX, the withstand voltage value is XX, the buffer capacitor and the blocking capacitor are non-inductive capacitors; when the power supply is working, the full-bridge inverter unit The output voltage frequency of 3 is high frequency, duty ratio XX (full cycle), current effective value XX, secondary voltage of step-up transformer is high voltage high frequency, current effective value XX.
[0068] In summary, the capacitive load high-frequency high-voltage power supply provided by the embodiment of the present invention adopts the electrical connection mode of the control unit and the drive unit, which reduces the stray inductance in the main circuit and prevents the generation of stray inductance and buffer capacitance. Oscillation, on the other hand, the control unit adopts a highly intelligent and stable digital circuit and is equipped with various protections such as overcurrent, overvoltage, undercurrent, undervoltage, overtemperature, and IGBT failure.
[0069] The above are only preferred embodiments of the present invention, and are not used to limit the protection scope of the present invention.
