CN212367154U - Variable-frequency pulse power supply for electric desalting - Google Patents
Variable-frequency pulse power supply for electric desalting Download PDFInfo
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- CN212367154U CN212367154U CN202021003035.8U CN202021003035U CN212367154U CN 212367154 U CN212367154 U CN 212367154U CN 202021003035 U CN202021003035 U CN 202021003035U CN 212367154 U CN212367154 U CN 212367154U
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Abstract
The utility model discloses a variable frequency pulse power supply for electric desalting relates to electric desalting technical field, the power cascades through two inverter, the many level low voltage pulse power supply of direct output, and rethread pulse transformer device steps up and handles formation high voltage pulse DC power supply. By the variable-frequency pulse power supply, the voltage of the high-voltage pulse direct-current power supply can be increased by superposing the amplitudes as required, so that the variable-frequency pulse power supply is suitable for the wide variation of the load; or frequency superposition is carried out to carry out frequency multiplication on the high-voltage pulse direct-current power supply so as to improve the pulse desalting effect of products such as crude oil and the like; meanwhile, the two inverter devices can be used for hot backup, and when one inverter device fails, the other inverter device can be quickly switched to work. Has positive significance for the high-efficiency and long-term stable work of the variable frequency pulse power supply.
Description
Technical Field
The utility model relates to an electric desalting technical field especially relates to a variable frequency pulse power supply for electric desalting.
Background
The crude oil contains water, also contains natural emulsifiers such as colloid, asphaltene and the like, during the process of exploitation and transportation of the crude oil, due to severe disturbance, the water is dispersed in the crude oil in a micro-droplet state, the emulsifiers in the crude oil are concentrated on an oil-water interface by virtue of adsorption to form a firm molecular film to form stable emulsion, the stability degree of the emulsion depends on the properties and the concentration of the emulsifiers, the properties of the crude oil, the water dispersion degree, the time for forming the emulsion and other factors, the crude oil is strongly stirred mechanically, the concentration of the emulsifiers is high, the viscosity of the crude oil is high, the time for forming the emulsion is long, and the stability degree of the emulsion is increased. The electric desalting of crude oil is mainly to add demulsifier to destroy the emulsified state, and to make the micro water drop coalesce into large water drop under the action of electric field to separate oil from water. Since most of the salts in the crude oil are dissolved in water, desalting and dewatering are performed simultaneously.
The main process parameters of crude oil electric desalting can be divided into two types, one type refers to adjustable parameters in the desalting operation process, and the parameters mainly comprise temperature, water injection amount, demulsifier type and injection amount, oil-water mixing strength, electric desalting boundary level and the like, and the parameters obviously influence the electric desalting effect of crude oil. Another type is a design parameter that is related to the nature of the crude oil, the amount of crude oil processed, and the equipment selected for the desalter. In actual operation, because the quality and the processing amount of crude oil are fixed, parameters such as desalting pressure, the residence time of the crude oil in an electric field and the electric field strength are also fixed, and cannot be adjusted at will. However, when the supply of crude oil is short, the quality of crude oil cannot be effectively guaranteed, and the change of the quality of crude oil causes the change of parameters such as electric field intensity and the like, and greatly influences the load of a power supply. Therefore, it is desirable to provide an intelligent variable frequency pulse power supply, which provides a wide load regulation capability, and can maintain continuous, efficient and stable operation to satisfy the electric desalting and dewatering of crude oils with different qualities.
The invention discloses an invention patent with the application number of 200810119165.5, and relates to a crude oil electric dehydration high-power pulse power supply and a generation method thereof. The high-power pulse power supply comprises a low-voltage direct-current power supply device for outputting a low-voltage direct-current power supply, a high-power inverter device for performing inversion processing on the low-voltage direct-current power supply and outputting a bipolar low-voltage pulse power supply, a pulse transformer device for performing boosting processing on the bipolar low-voltage pulse power supply and outputting a high-voltage direct-current power supply, a pulse switch device for enabling the high-voltage direct-current power supply to become a high-voltage high-frequency pulse power supply for outputting to a load, a detection device and. According to the invention, a bipolar low-voltage pulse power supply is formed by rectifying, filtering and inverting low-voltage alternating current, a high-voltage direct current power supply is formed by boosting through a pulse transformer, and a high-voltage high-frequency pulse power supply is formed by a pulse switch group with a complementary structure.
The inverter adopts a full bridge or a half bridge to form a power conversion circuit, works by utilizing the area equivalent principle, the control end adopts carrier waves and target waveforms to be jointly modulated into PWM and then finally outputs the target waveforms through an inertia link, the realization of the pulse is realized by basically adopting an intermittent power supply mode, the pulse distortion is large, the switching frequency of a power device is several times of the output frequency, and the reliability is poor.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defects of the prior art, the present invention provides a variable frequency pulse power supply for electric desalination, which can conveniently adjust the voltage value and pulse waveform of high voltage direct current pulse, thereby realizing: adapt to wide variation of load and effectively improve the effect of pulse desalination of products such as crude oil and the like.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a variable frequency pulsed power supply for electrical desalination comprising:
the first low-voltage direct-current power supply device comprises a first rectifier and a first filtering device and is used for rectifying and filtering low-voltage alternating current and outputting a first low-voltage direct-current power supply with an adjusted amplitude;
the second low-voltage direct-current power supply device comprises a second rectifier and a second filtering device and is used for rectifying and filtering the low-voltage alternating current and outputting a second low-voltage direct-current power supply with the amplitude adjusted;
the isolation transformer is used for electrically isolating the input ends of the first low-voltage direct-current power supply device and the second low-voltage direct-current power supply device;
the contactor is arranged between the isolation transformer and the low-voltage alternating current and is used for controlling the connection between the second low-voltage direct current power supply device and the low-voltage alternating current;
the first inversion device is connected with the first low-voltage direct-current power supply device and is used for carrying out inversion processing on the first low-voltage direct-current power supply;
the second inversion device is connected with the second low-voltage direct-current power supply device and is used for carrying out inversion processing on the second low-voltage direct-current power supply; the low-voltage pulse power supply is cascaded with the first inverter and is adjusted in output amplitude value through duty ratio modulation, and the low-voltage pulse power supply is a bipolar low-voltage pulse power supply or a multi-level low-voltage pulse power supply;
the pulse transformer device is connected with the first inverter device and the second inverter device which are cascaded and used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
the detection device is used for monitoring the current and the voltage of the low-voltage pulse direct-current power supply input by the pulse transformer device and acquiring output parameters;
and the control device is respectively connected with the first low-voltage direct-current power supply device, the second low-voltage direct-current power supply device, the first inverter device, the second inverter device, the contactor and the detection device and is used for adjusting the amplitude of the first low-voltage direct-current power supply, the amplitude of the second low-voltage direct-current power supply and the amplitude and frequency of the low-voltage pulse power supply according to the output parameters.
The variable-frequency pulse power supply performs power isolation on the input of the second inverter through the isolation transformer, so that the output of the first inverter and the output of the second inverter can be cascaded to obtain the multi-level low-voltage pulse power supply; the contactor can cut off the second low-voltage direct-current power supply device when the second inverter device bypasses.
Furthermore, the first inverter device and the second inverter device both comprise a group of H-bridge inverters and an inverter driving circuit, and the control device drives the H-bridge inverters through the inverter driving circuit.
Furthermore, all the switch tubes of each bridge arm of the H-bridge inverter are MOS tubes or all the switch tubes are IGBT transistors.
Furthermore, the variable-frequency pulse power supply further comprises two reactors which are respectively arranged between the first inverter device and the pulse transformer device and between the second inverter device and the pulse transformer.
Furthermore, the input of the variable frequency pulse power supply is low-voltage three-phase alternating current, the contactor is a three-phase contactor, the first rectifier is a three-phase rectifier, the second rectifier is a three-phase rectifier, and the isolation transformer is a three-phase isolation transformer.
Further, the isolation transformer is of a star-triangle structure.
Further, the control device includes:
the parameter acquisition module is connected with the detection device and used for receiving output parameters from the detection device;
the first low-voltage direct-current power supply control module is connected with the first low-voltage direct-current power supply device and is used for adjusting the amplitude of the first low-voltage direct-current power supply by controlling the trigger angle of the controllable silicon;
the second low-voltage direct-current power supply control module is connected with the contactor and used for switching on or switching off the connection between a second low-voltage direct-current power supply and low-voltage alternating current;
the pulse width modulation module is connected with the first inverter device and the second inverter device and used for adjusting the amplitude of the low-voltage pulse power supply in a pulse width modulation mode;
and the central processing module is respectively connected with the parameter acquisition module, the first low-voltage direct-current power supply control module, the second low-voltage direct-current power supply control module and the pulse width modulation module and is used for controlling the amplitude of the first low-voltage direct-current power supply output by the first low-voltage direct-current power supply device through the low-voltage direct-current power supply control module according to the output parameters and controlling the amplitude of the low-voltage pulse power supply output by the first inverter device and the second inverter device in a cascading manner through the pulse width modulation module.
The utility model provides a frequency conversion pulse power supply for electric desalting, the power cascades through two inverter, the many level low pressure pulse power supply of direct output, and rethread pulse transformer device steps up and handles formation high-voltage pulse DC power supply. By the generation method, the voltage of the high-voltage pulse direct-current power supply can be increased by amplitude superposition according to needs, and the wide-range change of the load is adapted; or frequency superposition is carried out to carry out frequency multiplication on the high-voltage pulse direct-current power supply so as to improve the pulse desalting effect of products such as crude oil and the like; meanwhile, the two inverter devices can be used for hot backup, and when one inverter device fails, the other inverter device can be quickly switched to work. Has positive significance for the high-efficiency and long-term stable work of the variable frequency pulse power supply.
Drawings
Fig. 1 is a system block diagram of a variable frequency pulse power supply of the present invention;
fig. 2 is a circuit diagram of an embodiment of the variable frequency pulse power supply of the present invention;
fig. 3 is a circuit diagram of the cascade output of the first inverter and the second inverter according to the embodiment of the present invention;
fig. 4 is a schematic waveform diagram of the cascade output according to the embodiment of the present invention.
Reference numerals:
1. a first three-phase rectifier; 2. a first filtering means; 3. a three-phase contactor; 4. a three-phase isolation transformer; 5. a second three-phase rectifier; 6. a second filtering means; 7. a control device; 8. a first inverter device; 9. a second inverter device; 10. a detection device; 11. a first reactor; 12. a second reactor; 13. a pulse transformer device.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
As shown in fig. 1-4, the utility model discloses a frequency conversion pulse power supply for electric desalting, its input connects 380V's three-phase alternating current, including functional modules such as first three-phase rectifier 1, first filter equipment 2, three-phase contactor 3, three-phase isolation transformer 4, second three-phase rectifier 5, second filter equipment 6, controlling means 7, first inverter 8, second inverter 9, detection device 10, first reactor 11, second reactor 12 and pulse transformer device 13.
The first three-phase rectifier 1 and the first filter device 2 are used for rectifying and filtering low-voltage alternating current and outputting a first low-voltage direct-current power supply with an adjusted amplitude; and the second three-phase rectifier 5 and the second filtering device 6 are used for rectifying and filtering the low-voltage alternating current and outputting a second low-voltage direct-current power supply with the amplitude adjusted. In this embodiment, the first filtering device 2 and the second filtering device 6 are both capacitor banks for filtering and storing energy.
And a three-phase isolation transformer 4 for electrically isolating the input terminals of the first three-phase rectifier 1 and the second three-phase rectifier 5.
And the three-phase contactor 3 is arranged between the three-phase isolation transformer 4 and the low-voltage alternating current and used for controlling the operation of the second low-voltage direct current power supply device, and when the three-phase contactor 3 is disconnected, the output of the second low-voltage direct current power supply is stopped. The variable-frequency pulse power supply electrically isolates the input ends of the two groups of inversion devices through an isolation transformer 4, so that the output of the two inversion devices can be cascaded to obtain a multi-level low-voltage pulse power supply; meanwhile, the second low-voltage direct-current power supply device can be cut off when the second inverter device 9 bypasses through the three-phase contactor 3. The bypass application of the second inverter means 9 is described in detail below.
And the first inversion device 8 is connected with the first filtering device 2 and is used for carrying out inversion processing on the first low-voltage direct-current power supply.
The second inversion device 9 is connected with the second low-voltage direct-current power supply device and is used for performing inversion processing on the second low-voltage direct-current power supply; and the first inversion device 8 is cascaded, and the low-voltage pulse power supply with the regulated output amplitude value is modulated through a duty ratio, wherein the low-voltage pulse power supply is a bipolar low-voltage pulse power supply or a multi-level low-voltage pulse power supply.
The first inverter device 8 and the second inverter device 9 each include a group of H-bridge inverters and an inverter driving circuit, and the control device 7 drives the H-bridge inverters through the inverter driving circuit.
And the pulse transformer device 13 is connected with the first inverter device 8 and the second inverter device 9 which are cascaded, and is used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply.
The detection device 10 is used for monitoring the current and the voltage of the low-voltage pulse direct-current power supply input by the pulse transformer device 13 and acquiring output parameters;
and the control device 7 is respectively connected with the first low-voltage direct-current power supply device, the second low-voltage direct-current power supply device, the first inverter device 8, the second inverter device 9, the three-phase contactor 3 and the detection device 10, and is used for adjusting the amplitude of the low-voltage direct-current power supply and the amplitude and frequency of the low-voltage pulse power supply according to the output parameters.
In this embodiment, the low-voltage ac power refers to 220V or 380V ac power. The pulse voltage of the high-voltage pulse dc power supply is usually several tens of kilovolts.
The first reactor 11 and the second reactor 12 are provided between the first inverter device 8 and the pulse transformer device 13 and between the second inverter device 9 and the pulse transformer device 13, respectively, and perform an appropriate buffer smoothing function.
In the present embodiment, the three-phase isolation transformer 4 is a star-delta structure isolation transformer, and the source side of the isolation transformer is connected with three-phase alternating current, and the secondary side of the isolation transformer is connected with the second three-phase rectifier 5. The star-delta structure is a conventional structure of the isolation transformer, and when circuits of each phase in the isolation transformer are mismatched, the normal output of voltage can be ensured through absorption of a delta-connected annular loop of the secondary side of the isolation transformer.
Cascade of a first inverter device 8 and a second inverter device 9:
as shown in fig. 2, in the present application, the first inverter device 8 and the second inverter device 9 are cascaded as specifically described below.
The first inverter device 8 is an H-bridge inverter and is composed of four switching tubes S1, S2, S3 and S4, the switching tubes may be MOS transistors (insulated gate field effect transistors) or IGBT transistors (insulated gate bipolar transistors), the switching tubes are provided with protection diodes, wherein the switching tubes S1 and S3 form two upper bridge arms, are connected with a positive power supply (i.e., the positive electrode of the first filter device), and the switching tubes S2 and S4 form two lower bridge arms, and are connected with a negative power supply (i.e., the negative electrode of the first filter device).
A first output end A1 of the first inverter device 8 is led out from the connection of the switching tubes S1 and S2, and a second output end B1 is led out from the connection of the switching tubes S3 and S4; outputting a first bipolar low-voltage pulse power supply U1;
similarly, the second inverter 9 is an H-bridge inverter and is composed of four switching tubes S5, S6, S7 and S8, wherein the switching tubes S5 and S7 form two upper arms and are connected to a positive power supply (i.e., the positive pole of the second filter device), and the switching tubes S6 and S8 form two lower arms and are connected to a negative power supply (i.e., the negative pole of the second filter device).
A first output end A2 of the second inverter 9 is led out from the connection of the switching tubes S5 and S6, and a second output end B2 is led out from the connection of the switching tubes S7 and S8; and outputting the second bipolar low-voltage pulse power supply.
The first inverter device 8 and the second inverter device 9 are cascaded, that is, the first bipolar low-voltage pulse power supply and the second bipolar low-voltage pulse power supply output by the first inverter device and the second inverter device are subjected to voltage superposition, when the pulse width modulation is the same and the time sequence is the same, a group of boosted bipolar low-voltage pulse power supplies are formed, and when the pulse width modulation is different and/or the time sequence is different, a group of multi-level low-voltage pulse power supplies are formed. As shown in fig. 4.
In the present embodiment, the control device 7 includes: parameter acquisition module, first low pressure DC power supply control module, second low pressure DC power supply control module, pulse width modulation module and central processing module, wherein:
the parameter acquisition module is connected with the detection device 10 and used for receiving output parameters from the detection device 10; the first low-voltage direct-current power supply control module is connected with the first low-voltage direct-current power supply device and is used for adjusting the amplitude of the first low-voltage direct-current power supply by controlling the trigger angle of the controllable silicon;
the second low-voltage direct-current power supply control module is connected with the three-phase contactor 3 and used for switching on or switching off a second low-voltage direct-current power supply;
the pulse width modulation module is connected with the first inverter device 8 and the second inverter device 9 and used for adjusting the amplitude of the bipolar low-voltage pulse power supply in a pulse width modulation mode;
and the central processing module is respectively connected with the parameter acquisition module, the first low-voltage direct-current power supply control module, the second low-voltage direct-current power supply control module and the pulse width modulation module and is used for controlling the amplitude of the first low-voltage direct-current power supply output by the first low-voltage direct-current power supply device through the low-voltage direct-current power supply control module according to the output parameters and controlling the amplitude of the low-voltage pulse power supply output by the first inverter device and the second inverter device in a cascading manner through the pulse width modulation module.
The working principle of the cascaded inverter is specifically explained below with respect to the circuit of this embodiment:
the control device 7 controls the switching tubes S1, S2, S3 and S4 of the first inverter device 8 and the switching tubes S5, S6, S7 and S8 of the second inverter device 9 to be switched on or off to form an output loop.
And (3) superposition mode:
the first inverter device 8 and the second inverter device 9 are both in an inverter operating state.
When the switching tubes S1 and S4 of the first inverter device 8 are turned on and the switching tubes S5 and S8 of the second inverter device 9 are turned on, a positive-period pulse superposition path is established: from the positive pole of the power supply of the first inverter device 8 to the negative pole of the first inverter device 8 through the switching tubes S1 and S8; due to the continuity of the capacitor voltage, the voltage of the positive electrode of the capacitor C2 (the voltage of the positive electrode of the power supply of the second inverter device 9) is raised and returns to the negative electrode of the first inverter device 8 through the switch tube S5, the input winding of the pulse transformer device 13 and the switch tube S4.
Or the switching tubes S2 and S3 of the first inverter device 8 are turned on, and the switching tubes S6 and S7 of the second inverter device 9 are turned on, so as to establish a negative periodic pulse superposition path: the positive pole of the power supply of the first inverter device 8 is connected to the negative pole of the second inverter device 9 through a switch tube S3, an input winding of the pulse transformer device 13 and a switch tube S6; similarly, due to the continuity of the capacitor voltage, the voltage of the positive electrode of the capacitor C2 (the voltage of the positive electrode of the power supply of the second inverter device 9) is raised and returns to the negative electrode of the first inverter device 8 through the switching tubes S7 and S2.
As is apparent from the above description, in the application of the present embodiment, the output voltages of the first inverter device 8 and the second inverter device 9 are boosted by cascade connection, and the first inverter device 8 and the second inverter device 9 do not have a common ground level, so that in order to prevent the current from being reversely input into the power input circuit, the second isolation transformer 2 is required to be disposed at the input end of the second three-phase rectifier 4 to achieve electrical isolation.
Bypass mode:
when the high-voltage pulse direct-current power supply output by one inverter device 8 meets the requirements of pulse desalination application, the second inverter device 9 can also be bypassed. When the switching tubes S6 and S8 of the second inverter device 9 are turned on and S5 and S7 are turned off, the outputs a2 and B2 of the second inverter device 9 are in a short-circuited state, thereby forming a bypass. At the moment, the three-phase alternating current power supply to the second inverter device can be cut off through the three-phase contactor 3, and the energy-saving effect is achieved.
The utility model discloses a frequency conversion pulse power supply for electric desalting, control inverter output is not utilizing the area equivalence principle, but adopts the carrier wave to be the pure pulse output's of target waveform mode promptly, and the pulse waveform of production is output frequency promptly through inertia link, switching frequency, has reduced the switching frequency of contravariant power device, has improved the reliability of contravariant power device, and the pulse of output is for not having the true pulse through any link, and pulse efficiency can reach 98%.
The utility model discloses still adopt the cascaded mode of two H bridge inverter, but the work is in multiple mode: if two inverter device are connected in series output pulse (improve pulse peak voltage) simultaneously, two inverter device instantaneous parallel output (same switching frequency output frequency is doubled, can improve inverter device's reliability greatly) and two module mutual hot backup: when one module fails, the other module automatically supplies power to output.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A variable frequency pulsed power supply for electrical desalination, comprising:
the first low-voltage direct-current power supply device comprises a first rectifier and a first filtering device and is used for rectifying and filtering low-voltage alternating current and outputting a first low-voltage direct-current power supply with an adjusted amplitude; the first rectifier is a silicon controlled rectifier;
the second low-voltage direct-current power supply device comprises a second rectifier and a second filtering device and is used for rectifying and filtering the low-voltage alternating current and outputting a second low-voltage direct-current power supply with the amplitude adjusted;
the isolation transformer is used for electrically isolating the input ends of the first low-voltage direct-current power supply device and the second low-voltage direct-current power supply device;
the contactor is arranged between the isolation transformer and the low-voltage alternating current and is used for controlling the connection between the second low-voltage direct current power supply device and the low-voltage alternating current;
the first inversion device is connected with the first low-voltage direct-current power supply device and is used for carrying out inversion processing on the first low-voltage direct-current power supply;
the second inversion device is connected with the second low-voltage direct-current power supply device and is used for carrying out inversion processing on the second low-voltage direct-current power supply; the low-voltage pulse power supply is cascaded with the first inverter and is adjusted in output amplitude value through duty ratio modulation, and the low-voltage pulse power supply is a bipolar low-voltage pulse power supply or a multi-level low-voltage pulse power supply;
the pulse transformer device is connected with the first inverter device and the second inverter device which are cascaded and used for boosting the low-voltage pulse power supply and outputting a high-voltage pulse direct-current power supply;
the detection device is used for monitoring the current and the voltage of the low-voltage pulse direct-current power supply input by the pulse transformer device and acquiring output parameters;
and the control device is respectively connected with the first low-voltage direct-current power supply device, the second low-voltage direct-current power supply device, the first inverter device, the second inverter device, the contactor and the detection device and is used for adjusting the amplitude of the low-voltage direct-current power supply and the amplitude and frequency of the low-voltage pulse power supply according to the output parameters.
2. The variable frequency pulsed power supply for electric desalination of claim 1, wherein the first inverter and the second inverter each comprise a set of H-bridge inverters and an inverter driving circuit, and the control device drives the H-bridge inverters through the inverter driving circuit.
3. The variable-frequency pulse power supply for electric desalting according to claim 2, wherein the switching tubes of each bridge arm of the H-bridge inverter are all MOS tubes or all IGBT transistors.
4. The variable frequency pulsed power supply for electric desalination of claim 1, further comprising two reactors disposed between the first inverter means and the pulse transformer means and between the second inverter means and the pulse transformer means.
5. The variable frequency pulsed power supply for electrical desalination of claim 1, wherein the input of the variable frequency pulsed power supply is a low voltage three phase alternating current, the contactor is a three phase contactor, the first rectifier is a three phase silicon controlled rectifier, the second rectifier is a three phase rectifier, and the isolation transformer is a three phase isolation transformer.
6. The variable frequency pulsed power supply for electrical desalination of claim 5, wherein the isolation transformer is of star-delta configuration.
7. A variable frequency pulsed power supply for electric desalination according to any of claims 1-6 characterized in that the control means comprises:
the parameter acquisition module is connected with the detection device and used for receiving output parameters from the detection device;
the first low-voltage direct-current power supply control module is connected with the first low-voltage direct-current power supply device and is used for adjusting the amplitude of the first low-voltage direct-current power supply by controlling the trigger angle of the controllable silicon;
the second low-voltage direct-current power supply control module is connected with the contactor and used for controlling the connection of a second low-voltage direct-current power supply device and low-voltage alternating current;
the pulse width modulation module is connected with the first inverter device and the second inverter device and used for adjusting the amplitude of the bipolar low-voltage pulse power supply in a pulse width modulation mode;
and the central processing module is respectively connected with the parameter acquisition module, the first low-voltage direct-current power supply control module, the second low-voltage direct-current power supply control module and the pulse width modulation module and is used for controlling the amplitude of a first low-voltage direct-current power supply output by the first low-voltage direct-current power supply device through the low-voltage direct-current power supply control module and controlling the low-voltage pulse power supply output by the first inversion device and the second inversion device in a cascading manner through the pulse width modulation module according to the output parameters.
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| CN202021003035.8U CN212367154U (en) | 2020-06-04 | 2020-06-04 | Variable-frequency pulse power supply for electric desalting |
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| CN202021003035.8U CN212367154U (en) | 2020-06-04 | 2020-06-04 | Variable-frequency pulse power supply for electric desalting |
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