Intermediate-frequency static conversion power supply

Abstract

The utility model discloses an intermediate frequency static conversion power supply, comprising an AC / DC rectification unit, a DC / AC inversion frequency conversion unit, an isolation transformer unit, an AC / DC rectification unit, a super energy storage unit connected between the DC / AC inversion frequency conversion unit, and a charging unit connected between the super energy storage unit and the AC / DC rectification unit, a reversely arranged diode is connected between the output end of the super energy storage unit and the output end of the AC / DC rectification unit. According to the circuit, the anti-reverse diode is connected in parallel with the super capacitor bank between the direct current buses HV + and HV-behind the rectification unit for energy storage, and the super capacitor has the functions of high energy storage density, large instantaneous discharge current, multiple cycle times and the like, and can meet the energy storage requirements of multi-frequency instantaneous voltage drop and interruption.

Description

Technical Field

[0001] The utility model belongs to the field of inverter and frequency converter power supplies, and particularly relates to an intermediate frequency static inverter power supply. Background Art

[0002] With the continuous development of industry, the quality of the power grid is difficult to adapt to the continuous development of electrical equipment. In particular, short power outages or voltage sags within 1 second caused by lightning strikes, ATS dual power source switching, instantaneous startup of large electrical equipment, etc., result in the abnormal operation of other electrical equipment within the same power grid. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an intermediate frequency static inverter power supply, which solves the problem that short power outages or voltage sags in the prior art affect the normal operation of other electrical equipment.

[0004] The utility model adopts the following technical solutions to solve the above technical problems:

[0005] An intermediate frequency static inverter power supply includes an AC / DC rectification unit, a DC / AC inversion and frequency conversion unit, and an isolation transformer unit connected in sequence. A super energy storage unit is connected between the AC / DC rectification unit and the DC / AC inversion and frequency conversion unit. A charging unit is connected between the super energy storage unit and the AC / DC rectification unit. A diode with a reverse setting is connected between the output end of the super energy storage unit and the output end of the AC / DC rectification unit.

[0006] A diode with forward conduction is connected between the positive output end of the super energy storage unit and the positive output end of the AC / DC rectification unit. A diode with reverse cut-off is connected between the negative output end of the super energy storage unit and the negative output end of the AC / DC rectification unit.

[0007] The AC / DC rectification unit inputs three-phase 380V 50HZ alternating current; the isolation transformer outputs three-phase four-wire 200V 400HZ alternating current.

[0008] The super capacitor energy storage unit is composed of a super capacitor group. Each single module is composed of super capacitor monomers with a voltage of 2.7 - 3.0V connected in series. The number of series-connected capacitors depends on the voltage level of the DC bus. Then, multiple modules are connected in parallel according to the amount of stored energy. The stored energy can ensure the normal output of the rear-end inverter when the grid voltage sags.

[0009] The charging unit is used to charge the super capacitor with constant voltage and constant current, and store energy in the super capacitor when the grid is normal.

[0010] The AC / DC rectification unit rectifies the 380V alternating current input from the grid mains through a three-phase full bridge to output direct current of 530 - 550V for use by the inverter.

[0011] The DC / AC inverter and frequency conversion unit converts direct current of 530 - 550V into alternating current and changes the frequency to three-phase alternating current of 400HZ output by the inverter and frequency conversion unit.

[0012] The isolation transformer unit isolates and transforms the 400HZ alternating current output by the inverter and frequency conversion unit to output three-phase alternating current of 200V and 400HZ.

[0013] The intermediate frequency static inverter power supply has the function of supporting voltage sags and momentary power outages.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. In this circuit, a supercapacitor bank is connected in parallel between the DC bus bars HV+ and HV- after the rectification unit through an anti-reverse diode for energy storage. The supercapacitor has functions such as high energy storage density, large instantaneous discharge current, and many cycle times, and can meet the energy storage requirements for multiple instantaneous voltage dips and interruptions.

[0016] 2. The present invention uses supercapacitor energy storage to solve the disadvantages of traditional battery energy storage, such as few discharge times, short lifespan, and large volume.

[0017] 3. The present invention solves the problem that traditional static inverters do not have an energy storage unit, and when there is a short-term instantaneous power outage in the power grid, they immediately stop output, causing the backend equipment to shut down. Description of the Drawings

[0018] Figure 1 It is the circuit principle block diagram of the intermediate frequency static inverter power supply of the utility model.

[0019] Figure 2 It is the circuit schematic diagram of the AC / DC rectification unit of the utility model.

[0020] Figure 3 It is the circuit schematic diagram of the DC / AC inverter and frequency conversion unit of the utility model.

[0021] Figure 4 It is the schematic diagram of the isolation transformer of the utility model.

[0022] Figure 5 It is the schematic diagram of the supercapacitor energy storage circuit of the utility model.

[0023] Figure 6 It is the schematic diagram of the supercapacitor charger of the utility model. Detailed Embodiments

[0024] The structure and working process of the utility model will be further described below with reference to the drawings.

[0025] An intermediate frequency static inverter power supply includes an AC / DC rectification unit, a DC / AC inverter frequency conversion unit, and an isolation transformer unit connected in sequence. A super energy storage unit is connected between the AC / DC rectification unit and the DC / AC inverter frequency conversion unit. A charging unit is connected between the super energy storage unit and the AC / DC rectification unit. A diode arranged in reverse is connected between the output end of the super energy storage unit and the output end of the AC / DC rectification unit.

[0026] Specific embodiments are as Figures 1 to 6 shown,

[0027] An intermediate frequency static inverter power supply includes an AC / DC rectification unit, a DC / AC inverter frequency conversion unit, and an isolation transformer unit connected in sequence. A super energy storage unit is connected between the AC / DC rectification unit and the DC / AC inverter frequency conversion unit. A charging unit is connected between the super energy storage unit and the AC / DC rectification unit. A diode arranged in reverse is connected between the output end of the super energy storage unit and the output end of the AC / DC rectification unit.

[0028] A diode with forward conduction is connected between the positive output end of the super energy storage unit and the positive output end of the AC / DC rectification unit. A diode with reverse cut-off is connected between the negative output end of the super energy storage unit and the negative output end of the AC / DC rectification unit.

[0029] The AC / DC rectification unit inputs three-phase 380V 50HZ alternating current; the isolation transformer outputs three-phase four-wire 200V 400HZ alternating current.

[0030] The supercapacitor energy storage unit is composed of a supercapacitor group. Each single module is composed of supercapacitor monomers with a voltage of 2.7 - 3.0V connected in series. The number of series-connected monomers depends on the voltage level of the DC bus. Then, multiple modules are connected in parallel according to the amount of stored energy. The energy stored in it can ensure the normal output of the rear-end inverter when the grid voltage sags.

[0031] The charging unit is used to charge the supercapacitor with constant voltage and constant current, and store energy in the supercapacitor when the grid is normal.

[0032] The AC / DC rectification unit rectifies the 380V alternating current input from the grid mains through a three-phase full bridge rectifier and outputs 530 - 550V direct current for use by the inverter.

[0033] The DC / AC inverter frequency conversion unit inverses the 530 - 550V direct current and changes the frequency to 400HZ three-phase alternating current output by the inverter frequency conversion unit.

[0034] The isolation transformer unit isolates and transforms the 400HZ alternating current output by the inverter frequency conversion unit and outputs three-phase 200V, 400HZ alternating current.

[0035] The intermediate frequency static frequency converter power supply has the function of supporting voltage sags and momentary power outages.

[0036] The key unit of this solution is to use supercapacitor energy storage to provide energy support for the inverter when the power grid experiences voltage sags or short-term power outages.

[0037] The static frequency converter power supply of the present utility model is a power conversion device, which can be specifically applied to the field of aircraft engines. When the ground aircraft's engine is not working, the static frequency converter power supply of the present utility model is required to supply power to the equipment on the aircraft. It has the function of supporting voltage sags and momentary power outages, that is, when the power grid experiences voltage sags or short-term power outages, supercapacitor energy storage is used to provide energy support for the inverter.

[0038] The specific working principle and process of the intermediate frequency static frequency converter power supply of this solution are as follows:

[0039] When the input power grid is normal, three-phase 380V 50HZ alternating current is input into the AC / DC rectification unit to output direct current. At the same time, the supercapacitor is charged through the charging unit. The direct current is inverted and frequency-converted through the DC / AC inverter to output three-phase three-wire 280V / 400HZ alternating current, which is output as three-phase four-wire 200V 400HZ alternating current through the isolation transformer for the load to use. When the input power grid is interrupted, the supercapacitor module supplies power to the DC bus HV through diodes D1 and D2 to maintain the normal operation of the DC / AC inverter unit and ensure the normal operation of the backend load.

[0040] When the power grid is normal, three-phase 380V 50HZ alternating current is rectified by the rectification unit to output direct current with a voltage of about 540V, which is supplied to the inverter and frequency-conversion unit. The inverter and frequency-conversion unit converts the 540V direct current into three-phase 280V 400HZ alternating current, and then the three-phase 280V 400HZ alternating current is changed into three-phase 200V 400HZ alternating current through the isolation transformer for the load to use. At the same time, the charging unit quickly stores energy in the supercapacitor by means of constant voltage and constant current for the direct current output by the rectification unit.

[0041] When the power grid experiences voltage sags or short-term power outages, the supercapacitor energy storage unit provides energy for the backend inverter and frequency-conversion unit through diodes D1 and D2 to ensure the normal operation of the inverter and frequency-conversion unit and the normal operation of the backend load.

[0042] The length of the support time for voltage sags, momentary power outages or short-term power outages depends on the capacitance of the supercapacitor in the supercapacitor energy storage unit. The supercapacitor energy storage unit can be increased in capacity by multiple parallel connections.

[0043] What the present utility model protects is the device of the intermediate frequency static inverter power supply and its circuit connection relationship, without involving the host computer control software. The identifiers in the attached drawings are used to distinguish the functions of various electronic components in the circuit diagram, which can be fully realized by those skilled in the art without further elaboration. The content protected by this application also does not involve the improvement of software and methods.

[0044] Those skilled in the art should understand that those skilled in the art can implement the variation examples in combination with the prior art and the above embodiments, and such variation examples do not affect the essence of this solution, so they will not be elaborated here.

[0045] It should be understood that this solution is not limited to the above specific implementation manners. The devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art, without departing from the scope of this solution's technical solution, can make many possible changes and modifications to this solution's technical solution by using the methods and technical content disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of this solution. Therefore, all simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of this solution without departing from the content of this solution's technical solution still fall within the scope of protection of this solution's technical solution.

Claims

1. An intermediate frequency static frequency converter power supply, comprising an AC / DC rectification unit, a DC / AC inversion and frequency conversion unit, and an isolation transformer unit connected in sequence, characterized in that: A super energy storage unit is connected between the AC / DC rectifier unit and the DC / AC inverter unit. A charging unit is connected between the super energy storage unit and the AC / DC rectifier unit. A diode with reverse setting is connected between the output terminals of the super energy storage unit and the AC / DC rectifier unit.

2. The IF static inverter power supply according to claim 1, wherein: A diode with forward conduction is connected between the positive output terminal of the super energy storage unit and the positive output terminal of the AC / DC rectifier unit. A diode with reverse cut-off is connected between the negative output terminal of the super energy storage unit and the negative output terminal of the AC / DC rectifier unit.

3. The intermediate frequency static frequency converter power supply according to claim 1, characterized in that: The AC / DC rectifier unit inputs three-phase 380V 50HZ alternating current; the isolation transformer outputs three-phase four-wire 200V 400HZ alternating current.

4. The IF static frequency converter according to claim 1, characterized in that: The super energy storage unit consists of a supercapacitor group. Each single module is composed of supercapacitor monomers with a voltage of 2.7 - 3.0V in series. The number of series is determined by the voltage level of the DC bus, and then multiple modules are connected in parallel according to the stored energy size. The stored energy can ensure the normal output of the backend inverter when the grid voltage sags.

5. The intermediate frequency static frequency converter power supply according to claim 1, characterized in that: The charging unit is used to charge the supercapacitor with constant voltage and constant current, and store energy in the supercapacitor when the grid is normal.

6. The IF static frequency converter power supply according to claim 1, characterized in that: The AC / DC rectifier unit rectifies the 380V alternating current input from the grid mains through a three-phase full bridge and outputs 530 - 550V direct current for the inverter to use.

7. The IF static frequency converter power supply according to claim 1, characterized in that: The DC / AC inverter unit inverses the 530 - 550V direct current and changes the frequency to 400HZ three-phase alternating current output by the inverter unit.

8. The IF static frequency converter power supply according to claim 1, wherein: The isolation transformer unit isolates and transforms the 400HZ alternating current output by the inverter unit and outputs three-phase 200V, 400HZ alternating current.

9. The IF static frequency converter power supply according to claim 1, wherein: The medium-frequency static inverter power supply has the function of supporting voltage sags and momentary power outages.

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