CN220711361U - Conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current - Google Patents
Conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current Download PDFInfo
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- CN220711361U CN220711361U CN202322370859.9U CN202322370859U CN220711361U CN 220711361 U CN220711361 U CN 220711361U CN 202322370859 U CN202322370859 U CN 202322370859U CN 220711361 U CN220711361 U CN 220711361U
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Abstract
The utility model provides a conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current, which comprises the following components: the device comprises an input module, a filtering module, an oscillation frequency division module, a frequency selection amplitude stabilization module and a power amplification module; the input module is used for providing a direct-current voltage signal; the filtering module is used for filtering and DC converting the DC voltage signal provided by the input module and respectively supplying power to the oscillation frequency division module, the frequency selection amplitude stabilization module and the power amplification module; the oscillation frequency division module outputs two stable square wave signals to the frequency-selecting amplitude-stabilizing module after oscillating and frequency-dividing the direct-current voltage signal; the frequency-selecting amplitude-stabilizing module is used for outputting single-phase and three-phase alternating voltage signals with high stability after frequency selection and amplitude stabilization of the input square wave signals, and providing the single-phase and three-phase alternating voltage signals to the power amplifying module; the power amplification module is used for amplifying the power of the input alternating voltage signal and providing the amplified alternating voltage signal for a load. The conversion circuit provided by the utility model improves the efficiency and reliability of direct current-single phase/three-phase alternating current power supply conversion.
Description
Technical Field
The utility model relates to the technical field of three-phase alternating current power supplies, in particular to a novel direct current-three-phase alternating current conversion circuit and a method.
Background
Along with the progress of technology, the demands of people on the performance of electric appliances are more and more complex, and part of electric appliances simultaneously need direct current, alternating current and three-phase alternating current power supply, so that the design of a direct current-alternating current conversion circuit in the electric appliances becomes the key of stable operation of the electric appliances. However, at present, the three-phase power supply cannot provide single-phase alternating current and three-phase alternating current at the same time, the central frequency and the power amplitude are not adjustable, the DC/AC voltage conversion, the isolation between a DC system and an AC system are poor, the fault current cannot be limited, the neutral point of the DC part is grounded, the neutral point of the AC system is easily and directly shorted, and the like, so that the problems of unstable conversion, poor efficiency, weak universality and the like of the DC-three-phase alternating current power supply are caused.
Disclosure of Invention
Aiming at the problems in the prior art, the conversion stability, the universality and the conversion efficiency of the direct current-three-phase alternating current power supply are improved. The utility model provides a DC-three-phase AC conversion circuit with adjustable center frequency and output voltage, which realizes the conversion of signals from low frequency to high frequency in one stage, simultaneously outputs single-phase AC and three-phase AC, realizes the electric insulation and isolation conversion of a DC system and an AC system, and realizes the control of the output voltage frequency and the center frequency by adjusting the resistance value of a resistor.
The utility model discloses a direct current-three-phase alternating current conversion circuit, which comprises: the device comprises an input module, a filtering module, an oscillation frequency division module, a frequency selection amplitude stabilization module and a power amplification module. The input module is used for providing a direct-current voltage signal; the filtering module is used for filtering and DC converting the DC voltage signal provided by the input module and respectively supplying power to the oscillation frequency division module, the frequency selection amplitude stabilization module and the power amplification module; the oscillation frequency division module outputs two stable square wave signals to the frequency-selecting amplitude-stabilizing module after oscillating and frequency-dividing the direct-current voltage signal; the frequency-selecting amplitude-stabilizing module is used for outputting single-phase and three-phase (phase difference of 120 ℃) alternating voltage signals with high stability after frequency selection and amplitude stabilization of the input square wave signals, and providing the alternating voltage signals to the power amplifying module; the power amplification module is used for amplifying the power of the input alternating voltage signal and providing the amplified alternating voltage signal for a load.
Specifically, after the + -25V- + -36V direct current voltage signals provided by the input module are transformed by the filtering module, power is supplied to the oscillation frequency division module, the frequency-selecting amplitude-stabilizing module and the power amplification module, and input is provided for the oscillation frequency division module, and one path of single-phase sine wave and one path of three-phase sine alternating current signals are output by the oscillation frequency division module, the frequency-selecting amplitude-stabilizing module and the power amplification module, so that DC-AC isolation transformation three-phase alternating current voltage output is realized.
The filtering module is used for filtering and converting the direct current voltage of +/-25V- +/-36V input by the input module into direct current voltages of +/-15V and +/-36V so as to improve electromagnetic compatibility of the system; further, the filtering module comprises an EMI filter and three DC/DC converters, one end of the EMI filter is connected with the output of the input module, the other end of the EMI filter is respectively connected with the input ends of the three DC/DC converters, and the direct current voltage of +/-25V- +/-36V input by the input module is subjected to filtering treatment and converted into direct current voltages of +/-15V and +/-36V through DC/DC conversion. The power amplifier comprises a power amplifier module, an oscillation frequency division module, a frequency-selecting amplitude-stabilizing module, a voltage regulator (voltage dividing resistor), a power amplifier module and a power amplifier module, wherein +/-15V is respectively used for supplying power to the circuit of the oscillation frequency division module and the circuit of the frequency-selecting amplitude-stabilizing module, one end of +15V is connected with the voltage regulator (voltage dividing resistor) of the oscillation frequency division module, one end of-15V is connected with the single-phase and three-phase circuit of the frequency-selecting amplitude-stabilizing module, and +/-36V is used for supplying power to the circuit of the power amplifier module.
Further, the oscillation frequency division module comprises a voltage stabilizer and a capacitor three-point oscillator, the voltage stabilizer stabilizes +15V direct current voltage output by the DC/DC converter, the output end of the voltage stabilizer outputs direct current voltage of 11V plus or minus 0.5V to supply power for the oscillator, and the oscillator outputs two stable square wave signals to the frequency-selecting amplitude-stabilizing module after oscillation frequency division. The oscillation frequency division module is used for reducing mutual interference between two paths of square waves and improving the load capacity of each path of square waves. Specifically, the circuit of the oscillation frequency division module is formed by three frequency division modules in a cascading mode, a 4096KHz square wave signal is output by a first-stage frequency division module, is processed by a second-stage module and a third-stage module in sequence, and two stable 500Hz square wave signals are output after frequency division is 8192 times.
Furthermore, the frequency-selecting amplitude-stabilizing module comprises a single-phase frequency-selecting amplitude-stabilizing circuit and a three-phase frequency-selecting amplitude-stabilizing circuit, wherein the single-phase frequency-selecting amplitude-stabilizing circuit and the three-phase frequency-selecting amplitude-stabilizing circuit can change the central frequency of a frequency-selecting network in the circuit by setting corresponding resistors and adjusting resistance values of the resistors, and regulate amplitude-stabilizing output voltage. Specifically, two stable 500Hz square wave signals are sent to the frequency-selecting amplitude-stabilizing module for frequency-selecting, amplitude-stabilizing and phase-shifting treatment, and a single-phase sine wave signal with the frequency of 500Hz and a three-phase sine alternating current signal with the frequency of 500Hz are respectively obtained, wherein the frequency, amplitude and phase of the single-phase sine wave signal and the three-phase sine wave signal are adjustable, the frequency and amplitude of the three-phase sine alternating current signals are equal, and the phase difference is 120 degrees.
Further, the power amplification module comprises a single-phase power amplification circuit and a three-phase power amplification circuit, the single-phase power amplification circuit comprises a power amplifier and a transformer, and the three-phase power amplification circuit comprises a power amplifier and a three-phase frequency-selecting phase-shifting circuit. The power amplification module respectively isolates and amplifies received single-phase sine wave signals with a path of frequency of 500Hz and three-phase sine alternating current signals with a path of frequency of 500Hz, so that the signals are converted from low frequency to high frequency, and single-phase alternating current and three-phase alternating current with carrying capacity are output at the same time.
Further, the working principle/conversion method of the conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current of the utility model comprises the following steps:
a) And (5) power supply filtering. Firstly, filtering a power supply signal to ensure the reliability and stability of the working performance of each module, filtering a direct-current voltage signal of +/-25V- +/-36V provided by an input module by a filtering module, and then respectively sending the direct-current voltage signal to an oscillation frequency division module, a frequency-selecting amplitude-stabilizing module and a power amplification module to respectively provide direct-current voltages of +/-15V and +/-36V for the direct-current voltage signal.
b) Oscillating frequency division. The oscillating frequency dividing module circuit is formed by three frequency dividing modules in a cascading mode, a 4096KHz square wave signal is output by the first-stage frequency dividing module, is processed by the second-stage module and the third-stage module in sequence, and two stable 500Hz square wave signals are output after frequency division is 8192 times.
c) Frequency selection and amplitude stabilization. And sending the two stable 500Hz square wave signals into a frequency-selecting amplitude-stabilizing module for frequency-selecting, amplitude-stabilizing and phase-shifting treatment to respectively obtain a single-phase sine wave signal with a frequency of 500Hz and a three-phase sine alternating signal with a frequency of 500Hz, wherein the frequency, amplitude and phase of the single-phase sine wave signal and the three-phase sine wave signal are adjustable, the frequency and amplitude of the three-phase sine alternating signal are equal, and the phase difference is 120 degrees.
d) Power amplification and isolation. The single-phase sine wave signal with the frequency of 500Hz and the three-phase sine alternating current signal with the frequency of 500Hz are respectively sent to the power amplification module for isolation and power amplification treatment, and then the conversion of the signals from low frequency to high frequency is realized, so that the single-phase alternating current with the carrying capacity and the three-phase alternating current are simultaneously output.
The conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current has the beneficial effects that: compared with the prior art, the utility model provides a conversion circuit for converting direct current with adjustable center frequency and output voltage into single-phase alternating current and three-phase alternating current, which realizes the conversion of signals from low frequency to high frequency in one stage, simultaneously outputs single-phase alternating current and three-phase alternating current, realizes the electric insulation and isolation conversion of a direct current system and an alternating current system, realizes the control of the output voltage frequency and the center frequency by adjusting the resistance value, and improves the conversion stability, the universality and the conversion efficiency of direct current-single-phase/three-phase alternating current power supplies.
Drawings
Fig. 1 is a system block diagram of a conversion circuit for converting direct current into single-phase and three-phase alternating current according to the present utility model.
Fig. 2 is a schematic diagram of a dc-to-single phase and three-phase ac conversion circuit according to the present utility model.
Fig. 3 is a specific circuit diagram of a converting circuit for converting dc into single-phase and three-phase ac according to the present utility model.
Detailed Description
A conversion circuit for converting direct current into single-phase and three-phase alternating current according to the present utility model will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a conversion circuit of the present utility model for converting direct current into single-phase and three-phase alternating current includes: the device comprises an input module, a filtering module, an oscillation frequency division module, a frequency selection amplitude stabilization module and a power amplification module. The 25V-36V direct current voltage signal provided by the input module is converted by the filtering module, and then is supplied to the oscillation frequency division module, the frequency-selecting amplitude-stabilizing module and the power amplification module to provide input for the oscillation frequency division module, and the signal and the three-phase sine alternating current signal are output by the oscillation frequency division module, the frequency-selecting amplitude-stabilizing module and the power amplification module to realize DC-AC isolation conversion three-phase alternating current voltage output.
Specifically, as shown in fig. 2, the filtering module includes an EMI filter and three DC/DC converters, one end of the EMI filter is connected to the output of the input module, and the other end of the EMI filter is connected to the input ends of the 3 DC/DC converters, respectively, and performs filtering processing on the 25V-36V DC voltage input by the input module and DC/DC conversion to convert the 25V-36V DC voltage into ±15v and ±36v DC voltages.
The oscillation frequency division module comprises a voltage stabilizer and a capacitor three-point oscillator, wherein the voltage stabilizer stabilizes +15V direct current voltage output by the DC/DC converter, and the output end of the voltage stabilizer outputs direct current voltage of 11V plus or minus 0.5V to supply power for the oscillator.
The frequency-selecting amplitude-stabilizing module comprises a single-phase frequency-selecting amplitude-stabilizing circuit and a three-phase frequency-selecting amplitude-stabilizing circuit, wherein the single-phase frequency-selecting amplitude-stabilizing circuit can adjust and change the central frequency of a frequency-selecting network in the circuit through resistance values, and adjust amplitude-stabilizing output voltage.
The power amplification module comprises a single-phase power amplification circuit and a three-phase power amplification circuit, wherein the single-phase power amplification circuit comprises a power amplifier and a transformer, and the three-phase power amplification circuit comprises a power amplifier and a three-phase frequency-selecting phase-shifting circuit.
Specific examples of the detection process are as follows:
the specific circuit is shown in fig. 3, after the 25V-36V direct current voltage signal provided by the input module is converted by the filtering module, the power is supplied to the oscillation frequency division module, the frequency-selecting amplitude-stabilizing module and the power amplifying module, the filtering module comprises an electromagnetic interference (EMI) filter HFB-CE03F and three DC/DC converters (an High Speed Generator (HSG) 28D15 and two HOMs 28S 36F), one end of the EMI filter is connected with the output of the input module, the other end of the EMI filter is respectively connected with the input ends of the 3 DC/DC converters, and the 25V-36V direct current voltage input by the input module is subjected to filtering treatment and DC/DC conversion to be converted into +/-15V and +/-36V direct current voltage.
The signal and pass through the oscillation frequency division module, the oscillation frequency division module includes the voltage stabilizer and three-point type oscillators of electric capacity, the voltage stabilizer (diode V1 and electric capacity C1 make up) is stabilized +15V direct current voltage that DC/DC converter output, after dividing the voltage through the resistance R1, its output end outputs the direct current voltage of 11V + -0.5V, supply power for the oscillator.
The three-point oscillator comprises a three-stage inverter of U1, a resistor R2, a capacitor C2 and a crystal Y1, wherein U1 is a CMOS digital integrated circuit CC4096. The oscillating frequency dividing circuit of the oscillator is formed by three frequency dividing modules in a cascading mode, a 4096KHz square wave signal is output by a first-stage frequency dividing module, is processed by a second-stage module and a third-stage module in sequence, and two stable 500Hz square wave signals are output after frequency division is performed 8192 times.
Two paths of 500Hz square waves are generated after the oscillation frequency division module, one path is used as the input of the single-phase frequency-selecting amplitude-stabilizing circuit, the other path is used as the input of the three-phase frequency-selecting amplitude-stabilizing circuit, and the frequency-selecting amplitude-stabilizing is realized by the mixed integrated circuit LB 8173A. The single-phase frequency-selecting amplitude-stabilizing circuit adjusts the central frequency of the frequency-selecting network by adjusting the resistance values of the R5 and R6 resistors, and adjusts the amplitude-stabilizing voltage by adjusting the resistance value of the R4 resistor, so that the amplitude of the output voltage is stable; the three-phase frequency-selecting amplitude-stabilizing circuit adjusts the central frequency of the frequency-selecting network by adjusting the resistance values of the R8 and R9 resistors, and adjusts the amplitude-stabilizing voltage by adjusting the resistance value of the R7 resistor, so that the amplitude of the output voltage is stable. Generating a single-phase 500Hz sine wave and a three-phase 500Hz sine wave.
The single-phase sine wave is used as an input of a single-phase power amplification circuit, the single-phase power amplification circuit comprises a power amplifier LB8181 and a transformer T1, the input end of the power amplifier LB8181 inputs single-phase 500Hz alternating voltage with high stability, and the output end of the power amplifier LB8181 is used as an input of the transformer T1. The transformer T1 increases the output voltage of the power amplifier to 26V and realizes an isolation function.
The three-phase power amplifying circuit comprises a power amplifier HDA502J, feedback resistors R12 and R13 and a damping capacitor C20, wherein three-phase sine waves are input into the power amplifier in the three-phase power amplifying circuit, and the output end of the power amplifier outputs voltage amplified by an in-phase amplifier and current amplified by a push-pull circuit, so that an alternating current signal with power is output.
When the dc-to-three-phase ac conversion circuit of the present embodiment performs power amplification, the amplification principles of the AI phase, the BI phase, and the CI phase of the three-phase power amplification circuit are the same, and the present embodiment describes the power amplification principle by taking CI as an example. The three-phase power amplifying circuit is composed of an HDA502J power amplifier, feedback resistors R12 and R13 and a damping capacitor C20. The voltage amplification factor can be adjusted by changing the resistance values of R12 and R13, so that the output voltage meets the requirement, and the capacitor C20 is used for eliminating parasitic oscillation possibly occurring on the output waveform of the power amplifier. The HDA502J type power amplifier is a typical power secondary integrated circuit, the input signal of the power secondary integrated circuit is 500Hz sine wave, and the output adopts a typical OCL circuit and has the functions of voltage and current amplification. The basic principle is as follows: the input 500Hz sine wave is voltage in-phase amplified by an in-phase amplifier and then current amplified by a push-pull circuit, thereby generating the required ac signal with power output.
Numerous specific details are set forth in the present embodiments in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than as described herein, and therefore the scope of the utility model is not limited to the specific embodiments disclosed below.
Claims (10)
1. A conversion circuit for converting direct current into single-phase and three-phase alternating current, the conversion circuit comprising: the device comprises an input module, a filtering module, an oscillation frequency division module, a frequency selection amplitude stabilization module and a power amplification module; the input module is used for providing a direct-current voltage signal; the filtering module filters and converts direct current voltage signals provided by the input module and respectively supplies power for the oscillation frequency division module, the frequency selection amplitude stabilization module and the power amplification module; the oscillation frequency division module outputs two stable square wave signals to the frequency-selecting amplitude-stabilizing module after oscillating and frequency-dividing the direct-current voltage signal; the frequency-selecting amplitude-stabilizing module is used for outputting single-phase and three-phase alternating voltage signals with high stability after frequency-selecting and amplitude-stabilizing the input square wave signals, and providing the single-phase and three-phase alternating voltage signals to the power amplifying module; the power amplification module is used for amplifying the power of the input alternating voltage signal and providing the amplified alternating voltage signal for a load.
2. The conversion circuit for converting direct current into single phase and three phase alternating current according to claim 1, wherein the input module provides a ±25v—±36V direct current voltage signal.
3. The converting circuit for converting direct current into single-phase and three-phase alternating current according to claim 1, wherein the filtering module comprises an EMI filter and three DC/DC converters, one end of the EMI filter is connected with the output of the input module, the other end of the EMI filter is respectively connected with the input ends of the three DC/DC converters, and the direct current voltages of +/-25V- ± 36V input by the input module are subjected to filtering treatment and converted into direct current voltages of +/-15V and +/-36V through DC/DC conversion.
4. A conversion circuit for converting direct current into single-phase and three-phase alternating current according to claim 3, wherein one end of +15v voltage output by the filtering module is connected with a voltage stabilizer of the oscillation frequency division module, one end of-15v voltage is connected with the single-phase and three-phase circuit of the frequency-selecting amplitude-stabilizing module, and +/-36V is used for supplying power to the power amplifying module.
5. The conversion circuit for converting direct current into single-phase and three-phase alternating current according to claim 3, wherein the oscillation frequency division module comprises a voltage stabilizer and a capacitor three-point oscillator, the voltage stabilizer stabilizes +15V voltage output by the filtering module, the output end of the voltage stabilizer outputs direct current voltage of 11 V+/-0.5V to supply power for the oscillator, and the oscillator outputs two stable square wave signals to the frequency-selecting amplitude-stabilizing module after oscillation frequency division.
6. The conversion circuit for converting direct current into single-phase and three-phase alternating current according to claim 5, wherein the circuit of the oscillation frequency division module is formed by three frequency division modules in a cascading mode, a 4096KHz square wave signal is output by a first-stage frequency division module, the 4096KHz square wave signal is processed by a second-stage and a third-stage module sequentially, and two stable 500Hz square wave signals are output after frequency division is performed 8192 times.
7. The conversion circuit for converting direct current into single-phase and three-phase alternating current according to claim 1, wherein the frequency-selecting amplitude-stabilizing module comprises a single-phase frequency-selecting amplitude-stabilizing circuit and a three-phase frequency-selecting amplitude-stabilizing circuit; in the single-phase frequency-selecting amplitude-stabilizing circuit and the three-phase frequency-selecting amplitude-stabilizing circuit, the central frequency of a frequency-selecting network in the circuit can be changed by adjusting the resistance value of the resistor through setting corresponding resistors, and the amplitude-stabilizing output voltage is adjusted.
8. The conversion circuit for converting direct current into single-phase and three-phase alternating current according to claim 6, wherein two stable 500Hz square wave signals are sent to the frequency-selecting amplitude-stabilizing module for frequency-selecting, amplitude-stabilizing and phase-shifting treatment, and a single-phase sine wave signal with the frequency of 500Hz and a three-phase sine alternating current signal with the frequency of 500Hz are respectively obtained, wherein the frequency, amplitude and phase of the single-phase sine wave signal and the three-phase sine wave signal are adjustable, the frequency and amplitude of the three-phase sine alternating current signals are equal, and the phase difference is 120 degrees.
9. The conversion circuit for converting direct current into single-phase and three-phase alternating current according to claim 1, wherein the power amplification module comprises a single-phase power amplification circuit and a three-phase power amplification circuit, the single-phase power amplification circuit comprises a power amplifier and a transformer, and the three-phase power amplification circuit comprises a power amplifier and a three-phase frequency-selecting phase-shifting circuit.
10. The conversion circuit for converting direct current into single-phase and three-phase alternating current according to claim 8, wherein the power amplification module performs isolation and power amplification processing on a received single-phase sine wave signal with a frequency of 500Hz and a received three-phase sine alternating current signal with a frequency of 500Hz respectively, so as to realize conversion of signals from low frequency to high frequency and output single-phase alternating current and three-phase alternating current with load capacity at the same time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322370859.9U CN220711361U (en) | 2023-09-01 | 2023-09-01 | Conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322370859.9U CN220711361U (en) | 2023-09-01 | 2023-09-01 | Conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current |
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| CN220711361U true CN220711361U (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322370859.9U Active CN220711361U (en) | 2023-09-01 | 2023-09-01 | Conversion circuit for converting direct current into single-phase alternating current and three-phase alternating current |
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| CN (1) | CN220711361U (en) |
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