CN206099812U - A single-phase sine wave variable frequency power supply system - Google Patents

Abstract

The utility model relates to power supply technology, in particular to a single-phase sine wave variable frequency power supply system, which includes a system DC input terminal and a system output terminal, and also includes a DC-DC conversion system, a DC-AC conversion system, a control system, an auxiliary power supply system and Protection system; DC-DC conversion system and DC-AC conversion system are connected in series at the DC input end of the system, and the output of the DC-AC conversion system is used as the system output end; the control system is respectively connected to the DC-DC conversion system, DC-AC conversion system and the system The output terminal; the auxiliary power supply system are respectively connected to the DC input terminal of the system, the protection system, the DC-DC conversion system, the DC-AC conversion system and the control system; the protection system is respectively connected to the DC input terminal of the system and the control system. The frequency of the power supply system can be set step-by-step or freely by keys within the range of 20-100Hz, and the voltage, current and frequency of the output sine wave are displayed on the LCD display. The load regulation rate and voltage regulation rate are both less than 0.2%, and the system efficiency reaches 92.3%. It has friendly human-computer interaction, superior performance and stable working status.

Description

A single-phase sine wave variable frequency power supply system

technical field

The utility model belongs to the technical field of power supplies, in particular to a single-phase sine wave frequency conversion power supply system.

Background technique

An inverter power supply is a device that uses power electronics technology for power conversion. It obtains a regulated AC output from an AC or DC input for power consumption by AC loads. The main uses of inverter power supply are: 1. In mobile power supply places or areas without electricity, together with other power generation equipment (solar energy, wind energy, water energy and various fuel generators) or direct current (battery batteries, switching power supplies, fuel cells, etc.) , to provide users with a stable and reliable AC power supply; 2. As an uninterruptible power supply for communication and power systems; 3. As a fire emergency power supply; 4. Using a portable power supply to provide temporary AC power, etc. In modern production, the practical requirements of energy conservation and emission reduction, quality assurance and efficiency increase, scientific development, and sustainable development urgently require inverter technology to play a more extensive role in more and more fields. Therefore, it is very necessary to develop a single-phase sine wave variable frequency power supply device to meet the power supply requirements of different occasions, where the power input can be a DC battery, thereby enhancing the flexibility and mobility of the system.

From a principle point of view, the more common inverters on the market include traditional inverters and digital inverters. The transformer of the traditional inverter is made of ordinary silicon steel sheets, which has many consumables, is heavy and has low efficiency, and the waste of electric energy is serious, the output voltage is unstable, and it is easy to damage the electrical appliances. Burning of the output power tube and battery. Digital inverter power supply is a practical product combining computer technology and power supply technology. It adopts switching power supply scheme with high efficiency and good flexibility, but some of them do not include adjustable output frequency, real-time monitoring of output voltage and current, over-current protection and automatic Recovery and other functions, the effect of human-computer interaction is poor.

From the perspective of waveforms, the output quality of square wave inverters currently on the market is poor, which is likely to cause severe instability, poor load capacity, and cannot be used with inductive loads.

Utility model content

The purpose of this utility model is to propose a medium and small power sine wave inverter power supply that can input direct current, output high-quality alternating current, have high efficiency, low noise, various protection and self-recovery functions, strong flexibility, and good human-computer interaction. .

In order to achieve the above purpose, the technical solution adopted by the utility model is: a single-phase sine wave variable frequency power supply system, including the system DC input terminal and the system output terminal, and also includes a DC-DC conversion system, a DC-AC conversion system, and a control system , auxiliary power supply system and protection system; DC-DC conversion system and DC-AC conversion system are connected in series at the DC input end of the system, and the output of the DC-AC conversion system is used as the system output end; the control system is respectively connected to the DC-DC conversion system, DC- The AC conversion system and the system output; the auxiliary power system is respectively connected to the system DC input, the protection system, the DC-DC conversion system, the DC-AC conversion system and the control system; the protection system is respectively connected to the system DC input and the control system.

In the above-mentioned single-phase sine wave variable frequency power supply system, the DC-DC conversion system includes inductors, diodes, switch tubes and their drive chips, and filter capacitors; one end of the inductor is connected to the DC input end of the system, connected to the positive pole of the input filter capacitor, and Connect the switch tube drain and the diode anode of the switch tube and its drive chip; the switch tube and the switch tube drain of the drive chip are connected to the inductor and the diode anode; the gate is connected to the output port of the drive chip through a resistor, the source is grounded, and the gate, The source is connected to the discharge resistor; the VDD pin of the driver chip is connected to the auxiliary power supply system, and the INA pin is connected to the control system; the cathode of the diode is connected to the positive pole of the filter capacitor as the DC voltage output of the DC-DC conversion system, and connected to the DC-AC conversion system ; Filter capacitor negative ground.

In the above-mentioned single-phase sine wave frequency conversion power supply system, the inductance adopts E-type inductance and EE55 type magnetic core; the diode uses Schottky diode MBR10100CT; The filter capacitor adopts 1 electrolytic capacitor and 2 ceramic capacitors connected in parallel.

In the above-mentioned single-phase sine wave variable frequency power supply system, the DC-AC conversion system includes a full-bridge inverter circuit and an LC filter circuit, and the full-bridge inverter circuit and the LC filter circuit are connected in series after the DC voltage output of the DC-DC conversion system .

In the above-mentioned single-phase sine wave variable frequency power supply system, the full-bridge inverter circuit includes the first half-bridge driver chip IRS21867, the second half-bridge driver chip IRS21867, the first high-power switch tube CSD19536, the second high-power switch tube CSD19536, The third high-power switch tube CSD19536, the fourth high-power switch tube CSD19536 and peripheral circuits adopt bipolar SPWM modulation; the LC filter circuit includes an E-type inductor with an EE55 magnetic core connected in series with a CBB capacitor.

In the above-mentioned single-phase sine wave frequency conversion power supply system, the control system includes a single-chip microcomputer, voltage transformer circuit, current transformer circuit, AD sampling circuit, matrix keyboard and LCD liquid crystal display; The mutual inductor circuit and the AD sampling circuit are respectively connected in series to the output end of the system, and the matrix keyboard and the LCD liquid crystal display are connected to the periphery of the single-chip computer.

In the above-mentioned single-phase sine wave frequency conversion power supply system, MSP430F5529 is used for single-chip microcomputer, and MSP-EXP430F5529 USB experiment board with built-in LCD liquid crystal display is selected; 4×4 matrix keyboard is used for matrix keyboard, the model of voltage transformer is TV1013, and the model of current transformer is TV1013. The model is TA1013; the AD sampling circuit includes an AD sampling chip, a reference voltage chip and a linear voltage regulator; the AD sampling chip uses a 14-bit 4-channel, high-precision TLC3574, the reference voltage chip uses REF5040, and the linear voltage regulator uses LM1117.

In the above-mentioned single-phase sine wave variable frequency power supply system, the auxiliary power supply system includes +12V power supply circuit, +5V power supply circuit and -5V power supply circuit; The power supply circuits are respectively connected in series behind the +12V power supply.

In the above-mentioned single-phase sine wave variable frequency power supply system, the +12V power supply circuit is a BUCK circuit built with the step-down chip TPS54160, the +5V power supply circuit is a BUCK circuit built with the step-down chip TPS54340, and the -5V power supply circuit is a buck circuit built with the step-down chip TPS54340. The BUCK-BOOST circuit built by the chip TPS54340.

In the above-mentioned single-phase sine wave frequency conversion power supply system, the protection system includes a triode, a light-emitting diode and a relay circuit; the relay circuit is arranged at the DC input end of the system. The control terminal of the protection system is connected behind the IO port of the microcontroller, and connected to the base of the triode through a resistor.

The working process of the above-mentioned single-phase sine wave variable frequency power supply system: take the boost circuit and the full bridge inverter circuit as the core, respectively complete the DC-DC conversion and DC-AC conversion, use the single-chip microcomputer MSP430F5529 to generate PWM waves, and control the boost through the driver chip The switching tube in the circuit is turned on and off to generate a stable DC voltage as the input voltage of the full-bridge inverter circuit; at the same time, SPWM waves are generated, which are driven by the driver chip to drive the full-bridge inverter circuit, and sine waves with adjustable frequency are generated by LC filtering. A closed-loop feedback system is used to adjust the modulation ratio of the SPWM wave through the PID algorithm to control the stability of the output voltage.

The utility model has beneficial effects: it can output alternating current with good sine wave quality and adjustable frequency, the load adjustment rate and voltage adjustment rate are both less than 0.2%, and the system efficiency reaches 92.3%. The frequency of the power supply system can be set step-by-step or freely through the button within the range of 20-100Hz, and the voltage, current and frequency of the output sine wave are displayed on the LCD display. It has high efficiency, low noise, various protection and self-recovery functions, strong flexibility, superior performance, complete functions, stable work, and friendly human-computer interaction.

Description of drawings

Fig. 1 is the structural block diagram of an embodiment of the utility model;

Fig. 2 is a circuit diagram of a DC-DC conversion system of an embodiment of the present invention;

Fig. 3 is a circuit diagram of a DC-AC conversion system of an embodiment of the present invention;

Fig. 4 (a), Fig. 4 (b) is a control system circuit diagram of an embodiment of the utility model;

Figure 5(a) and Figure 5(b) are circuit diagrams of the auxiliary power supply system of an embodiment of the present invention;

Fig. 6 is a circuit diagram of a protection system of an embodiment of the present invention.

detailed description

Embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings.

Examples of the described embodiments are shown in the drawings, wherein like or similar reference numerals designate like or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and cannot be construed as limiting the present invention.

The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. They are examples only and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. Additionally, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials. Additionally, configurations described below in which a first feature is "on" a second feature may include embodiments where the first and second features are formed in direct contact, and may include additional features formed between the first and second features. For example, such that the first and second features may not be in direct contact.

In the description of the present utility model, it should be noted that, unless otherwise stipulated and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements , may be directly connected, or may be indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

The technical solution adopted in this embodiment is as follows: a single-phase sine wave variable frequency power supply system, including a system DC input terminal and a system output terminal, and also includes a DC-DC conversion system, a DC-AC conversion system, a control system, an auxiliary power supply system and Protection system; DC-DC conversion system and DC-AC conversion system are connected in series at the DC input end of the system, and the output of the DC-AC conversion system is used as the system output end; the control system is respectively connected to the DC-DC conversion system, DC-AC conversion system and system The output terminal; the auxiliary power system is respectively connected to the system DC input terminal, the protection system, the DC-DC conversion system, the DC-AC conversion system and the control system; the protection system is respectively connected to the system DC input terminal and the control system.

Further, the DC-DC conversion system includes an inductor, a diode, a switch tube and its drive chip, and a filter capacitor; one end of the inductor is connected to the DC input end of the system, connected to the positive pole of the input filter capacitor, and the other end is connected to the switch tube and the switch tube of the drive chip. The drain is connected to the anode of the diode; the drain of the switching tube and the switching tube of the driver chip is connected to the inductor and the anode of the diode; the gate is connected to the output port of the driver chip through a resistor, the source is grounded, and the drain resistor is connected between the gate and the source; The VDD pin of the chip is connected to the auxiliary power supply system, and the INA pin is connected to the control system; the cathode of the diode is connected to the positive pole of the filter capacitor as the DC voltage output of the DC-DC conversion system, and is connected to the DC-AC conversion system; the negative pole of the filter capacitor is grounded.

Further, the inductance adopts E-type inductance, and the magnetic core of EE55 type is selected; the diode is Schottky diode MBR10100CT; the switching tube and the switching tube of the driving chip are selected from CSD19536, the driving chip is selected from UCC27524, and the filter capacitor is connected in parallel with 1 electrolytic capacitor and 2 a ceramic capacitor.

Further, the DC-AC conversion system includes a full-bridge inverter circuit and an LC filter circuit, and the full-bridge inverter circuit and the LC filter circuit are connected in series after the DC voltage output of the DC-DC conversion system.

Further, the full-bridge inverter circuit includes the first half-bridge drive chip IRS21867, the second half-bridge drive chip IRS21867, the first high-power switch tube CSD19536, the second high-power switch tube CSD19536, the third high-power switch tube CSD19536, the fourth The high-power switching tube CSD19536 and peripheral circuits adopt bipolar SPWM modulation; the LC filter circuit includes an E-type inductor with an EE55 core and a CBB capacitor connected in series.

Further, the control system includes a single-chip microcomputer, a voltage transformer circuit, a current transformer circuit, an AD sampling circuit, a matrix keyboard and an LCD liquid crystal display; the single-chip microcomputer is used as the control core, and the voltage transformer circuit and the current transformer circuit are respectively connected in series with the AD sampling circuit At the output end of the system, the matrix keyboard and LCD liquid crystal display are connected to the periphery of the single-chip microcomputer.

Further, MSP430F5529 is used for single-chip microcomputer, MSP-EXP430F5529USB experiment board with its own LCD liquid crystal display is selected; 4×4 matrix keyboard is used for matrix keyboard, the model of voltage transformer is TV1013, and the model of current transformer is TA1013; AD sampling circuit includes AD sampling chip , Reference voltage chip and linear regulator; AD sampling chip adopts 14-bit 4-channel, high-precision TLC3574, reference voltage chip adopts REF5040, linear regulator adopts LM1117.

Further, the auxiliary power supply system includes a +12V power supply circuit, a +5V power supply circuit and a -5V power supply circuit; the +12V power supply circuit is connected in series to the DC input end of the system, and the +5V power supply circuit and the -5V power supply circuit are respectively connected in series to the +12V power supply after.

Further, the +12V power supply circuit is a BUCK circuit built with a step-down chip TPS54160, the +5V power supply circuit is a BUCK circuit built with a step-down chip TPS54340, and the -5V power supply circuit is a BUCK-BOOST circuit built with a step-down chip TPS54340.

Furthermore, the protection system includes a triode, a light-emitting diode and a relay circuit; the relay circuit is arranged at the DC input end of the system. The control terminal of the protection system is connected behind the IO port of the microcontroller, and connected to the base of the triode through a resistor.

As shown in Figure 1 for specific implementation, a single-phase sine wave variable frequency power supply system includes: DC-DC conversion system 1, DC-AC conversion system 2, control system 3, auxiliary power supply system 4 and protection system 5. The DC-DC conversion system 1 and the DC-AC conversion system 2 are connected in series to the input DC voltage source, the output of the DC-AC conversion system 2 is used as the system output, and the control system 3, auxiliary power system 4 and protection system 5 are used as peripheral parts.

As shown in FIG. 2 , the DC-DC conversion system 1 includes an inductor 11 , a diode 12 , a switch tube and its driving chip 13 , and a filter capacitor 14 . One end of the inductor 11 is connected to the positive pole of the input filter capacitor after being connected to the DC power supply of the system, and the other end is connected to the drain of the switching tube and the anode of the diode 12 in the switching tube and its driving chip 13 . In the switching tube and its driving chip 13, the drain of the switching tube is connected to the inductor 11 and the anode of the diode 12, the gate is connected to the output port of the driving chip through a resistor, the source is grounded, the gate and the source are connected to a bleeder resistor, and the VDD pin of the driving chip is connected. Connect the output terminal of the 12V power supply circuit 41 in the auxiliary power supply system 4, connect the decoupling capacitor between the VDD pin and the ground, and connect the INA pin for inputting the PWM wave signal to the PWM wave output port of the single-chip microcomputer 31 in the control system 3 . The anode of the diode 12 is connected to one end of the inductor 11 that is not connected to the input power supply and the drain of the switch tube, and the cathode is connected to the anode of the filter capacitor 14 as the DC voltage output of the DC-DC conversion system, and is connected to the DC-AC conversion system 2 . The filter capacitor 14 includes one electrolytic capacitor and two ceramic capacitors connected in parallel, the positive electrode of the electrolytic capacitor is connected to the cathode of the diode 12, and the negative electrode is grounded.

As shown in FIG. 3 , the DC-AC conversion system 2 includes a full-bridge inverter circuit 21 and an LC filter circuit 22 . The full-bridge inverter circuit 21 consists of a half-bridge driver chip, the first half-bridge driver chip IRS21867 2101, the second half-bridge driver chip IRS21867 2102, a high-power switch tube, the first high-power switch tube CSD19536 2103, and the second high-power switch tube CSD19536 2104 , The third high-power switch tube CSD19536 2105, the fourth high-power switch tube CSD19536 2106 and peripheral circuits. The VCC terminals of the first half-bridge driver chip IRS21867 2101 and the second half-bridge driver chip IRS21867 2102 are connected in parallel to the output terminal of the 12V power supply circuit 41 in the auxiliary power supply system 4, and the COM terminals are respectively connected to the low-side switch tube and the second high-power switch tube The sources of CSD195362104 and the fourth high-power switching tube CSD19536 2106 are connected to the system ground, the LIN terminal and the HIN terminal are respectively connected to the two SPWM wave output ports of the control system 3, and the VB terminal is connected to the bootstrap One end of the capacitor is connected to the cathode of the bootstrap diode, the HO end is respectively connected to the gates of the first high-power switching tube CSD19536 2103 and the third high-power switching tube CSD19536 2105 through the driving resistor, and the LO end is respectively connected to the gate of the low-side switching tube through the driving resistor. The gate of the side switch tube CSD19536 2104 of the second high power switch tube and the gate of the fourth high power switch tube CSD19536 2106 are connected. The source of the first high-power switch CSD19536 2103 of the high-side switch is connected to the drain of the second high-power switch CSD19536 2104 of the low-side switch, and is connected to the other end of the bootstrap capacitor. The source of the third high-power switch CSD19536 2105 of the high-side switch is connected to the drain of the fourth high-power switch CSD19536 2106 of the low-side switch, and is connected to the other end of the bootstrap capacitor. High-power switch tubes The gate-source electrodes of the first high-power switch tube CSD19536 2103 , the second high-power switch tube CSD19536 2104 , the third high-power switch tube CSD19536 2105 , and the fourth high-power switch tube CSD19536 2106 are connected to discharge resistors. The drains of the high-side switch tubes of the first high-power switch tube CSD19536 2103 and the third high-power switch tube CSD19536 2105 are connected to the DC voltage output terminal of the DC-DC conversion system 1 . The output voltage of the full-bridge inverter circuit 21 is a bipolar SPWM wave with a sinusoidal pulse width. The LC filter circuit 22 filters out high-order harmonics to obtain a low-frequency sine wave AC. The LC inverter circuit 22 is composed of an E-shaped inductor and a CBB capacitor connected in series. The two input terminals of the LC inverter circuit 22 are respectively connected to the source of the first high-power switching tube CSD19536 2103 and the drain of the second high-power switching tube CSD19536 2104. pole connection and the source of the third high-power switch CSD19536 2105 and the drain of the fourth high-power switch CSD19536 2106. The two output ends of the LC inverter circuit 22 are the output ends of the sine wave AC power supply of the system.

As shown in Figure 4(a) and Figure 4(b), the control system 3 includes a single-chip microcomputer MSP430F5529 31, an LCD liquid crystal display 32, a matrix keyboard 33, a voltage transformer circuit 34, a current transformer circuit 35, and an AD sampling chip TLC3574 36 , voltage reference chip REF5040 37, and linear voltage regulator LM1117 38. As shown in Figure 4(a), the LCD liquid crystal display 32 is provided by the single-chip microcomputer MSP430F5529 31, and the matrix keyboard 33 is connected to the eight IO ports with interrupt function of the single-chip microcomputer 31, and the key values of the keys are obtained by the row scanning method and displayed in the control center. Processing in the single chip microcomputer 31. One SPWM wave output port of the single-chip microcomputer 31 is connected with the grid of the first high-power switch tube CSD19536 2103 and the third high-power switch tube CSD195362105 in the DC-AC conversion system 2, and the other SPWM wave output port is connected with the DC-AC The low-side switching tube in conversion system 2 is connected to the grid of the second high-power switching tube CSD19536 2104 and the fourth high-power switching tube CSD19536 2106 to realize bipolar SPWM modulation in the sine wave inverter, and the PWM wave output port is connected to the DC - the signal input INA pin of the switch tube and its drive chip 13 in the DC conversion system is connected. The voltage transformer circuit 34 and the current transformer circuit 35 are connected to the post-output stage of the system to convert large voltage and current into voltage signals available for AD chip sampling and filter the signals to ensure accurate sampling. The positive power supply terminal of the operational amplifier in the voltage transformer circuit 34 and the current transformer circuit 35 is connected with the output of the +5V power supply circuit 42 of the auxiliary power supply system 4, and the negative power supply terminal is connected with the output of the -5V power supply circuit 43 of the auxiliary power supply system 4 . As shown in FIG. 4( b ), the SCLK, SDI, SDO, and CS terminals of the AD sampling chip 36 are respectively connected to UCB0CLK, UCB0SIMO, UCB0SOMI of the single-chip microcomputer 31 and any IO port. The REFP terminal is connected to the output terminal of the voltage reference 37 , and the DVDD terminal is connected to the output of the linear regulator 38 . The input end of the linear voltage regulator 38 is connected to the +5V power output 42 of the auxiliary power system 4 . The software part takes the single-chip microcomputer 31 as the control core, controls high-speed AD sampling, monitors the output AC voltage and current in real time, and controls LCD display. The control system 3 is a digital feedback system, which continuously adjusts the SPWM wave modulation ratio through the PID algorithm, so that the effective value of the output voltage is stable at 36V, and when the output current exceeds 2.5A, the IO port connected to the base of the transistor 51 in the protection system 5 outputs High level, the control relay disconnects the front-stage input to realize over-current protection. At the same time, the output sine wave frequency is adjusted by adjusting the speed of reading the sine wave meter.

As shown in FIG. 5( a ) and FIG. 5( b ), the auxiliary power supply system 4 is composed of a 12V power supply circuit 41 , a +5V power supply circuit 42 , and a -5V power supply circuit 43 . As shown in Figure 5(a), the 12V power supply circuit 41 is connected to the system DC voltage input terminal, and the BUCK circuit built with the step-down chip TPS54160 is used to obtain the 12V DC power supply. The +5V power supply circuit 42 is connected to the rear stage of the 12V power supply circuit 41, and the BUCK circuit built with the step-down chip TPS54340 is used to obtain a 5V DC power supply. As shown in Figure 5(b), the -5V power supply circuit 43 and the +5V power supply circuit 42 are connected in parallel to the rear stage of the 12V power supply circuit 41, and the BUCK-BOOST circuit built with the step-down chip TPS54340 is used to obtain a -5V DC power supply.

As shown in FIG. 6 , the protection system 5 includes a triode 51 , a light emitting diode 52 and a five-pin relay 53 . The base of the triode 51 is connected with any IO port of the single-chip microcomputer 31 in the control system 3 through a resistor, the emitter is grounded, the collector is connected with the anode of the diode 52 and one end of the coil of the relay 53, and the cathode of the diode 52 is connected with the other end of the coil of the relay 53 Connected at one end. The normally closed end of the relay 53 is connected to the input end of the DC power supply in the DC-DC conversion system 1 . When the output current exceeds the overcurrent protection point, the IO port of the microcontroller outputs a high level, and the control relay disconnects the previous stage input to realize overcurrent protection. At the same time, the LED 52 lights up, indicating that the system enters the overcurrent protection state.

This embodiment can achieve: input DC voltage 24V, single-phase sine wave output voltage effective value 36V, rated full-load output power 72W, frequency can be set step by step or freely through the button within the range of 20-100Hz, and through the LCD display Display the voltage, current and frequency of the output sine wave. The load regulation rate and voltage regulation rate are both less than 0.2%, and the system efficiency reaches 92.3%. It has superior overall performance, complete functions, stable working status, and friendly human-computer interaction.

It should be understood that the parts not described in detail in this specification belong to the prior art.

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, those of ordinary skill in the art should understand that these are only examples, and various variations or modifications can be made to these embodiments without departing from the principles of the present invention. principle and essence. The scope of the invention is limited only by the appended claims.

Claims (10)

1. a kind of single-phase sine wave frequency-converting power supply, including system dc input and system output, it is characterised in that also Including DC-DC transformation systems, DC-AC transformation systems, control system, secondary power system and protection system；DC-DC transformation series System, DC-AC transformation systems are connected in series in system dc input, and DC-AC transformation systems are exported as system output；Control System connects respectively DC-DC transformation systems, DC-AC transformation systems and system output；Secondary power system distinguishes connection system Direct-flow input end, protection system, DC-DC transformation systems, DC-AC transformation systems and control system；Protection system connects respectively System direct-flow input end and control system.

2. single-phase sine wave frequency-converting power supply as claimed in claim 1, it is characterised in that DC-DC transformation systems include electricity Sense, diode, switching tube and its driving chip and filter capacitor；Inductance one end is connected to system dc input, with input filter Ripple capacitance cathode connects, and the other end drains with the switching tube of switching tube and its driving chip and diode anode is connected；Switching tube And its switching tube drain electrode connection inductance and diode anode of driving chip；Grid Jing resistance connects driving chip delivery outlet, source Pole is grounded, and bleeder resistance is connected between grid, source electrode；Driving chip VDD pins connect secondary power system, the connection control of INA pins System processed；Diode cathode connects filter capacitor positive pole as the direct voltage output of DC-DC transformation systems, with DC-AC conversion System connects；Filter capacitor minus earth.

3. single-phase sine wave frequency-converting power supply as claimed in claim 2, it is characterised in that inductance adopts E type inductance, selects The magnetic core of EE55 models；Diode uses Schottky diode MBR10100CT；The switching tube choosing of switching tube and its driving chip With CSD19536, driving chip selects UCC27524, and filter capacitor is using 1 electrochemical capacitor in parallel and 2 ceramic disc capacitors.

4. single-phase sine wave frequency-converting power supply as claimed in claim 1, it is characterised in that DC-AC transformation systems include complete Bridge inverter circuit and LC filter circuits, full bridge inverter, LC filter circuits are connected in series in the direct current of DC-DC transformation systems After pressure output.

5. single-phase sine wave frequency-converting power supply as claimed in claim 4, it is characterised in that full bridge inverter includes first Half-bridge driven chip IRS21867, the second half-bridge driven chip IRS21867 are the first high-power switchgear pipe CSD19536, second high Power switch pipe CSD19536, the 3rd high-power switchgear pipe CSD19536, the 4th high-power switchgear pipe CSD19536 and periphery electricity Road, using bipolar SPWM modulation system；LC filter circuits are included using the E types inductance and CBB electric capacity series connection of EE55 magnetic cores.

6. single-phase sine wave frequency-converting power supply as claimed in claim 1, it is characterised in that control system include single-chip microcomputer, Voltage transformer circuit, current transformer circuit, AD sample circuits, matrix keyboard and LCD liquid crystal display screen；Single-chip microcomputer is used as control Core processed, voltage transformer circuit, current transformer circuit are connected in series in system output, matrix with AD sample circuits respectively Keyboard is connected to SCM peripheral with LCD liquid crystal display screen.

7. single-phase sine wave frequency-converting power supply as claimed in claim 6, it is characterised in that single-chip microcomputer is adopted MSP430F5529, selection carry the MSP-EXP430F5529 USB brassboards of LCD liquid crystal display screen；Matrix keyboard selects 4 × 4 Matrix keyboard, voltage transformer model TV1013, current transformer model TA1013；AD sample circuits include AD sampling cores Piece, reference voltage chip and linear voltage regulator；AD sampling A/D chips adopt 14 4 passages, high-precision TLC3574, reference voltage Chip adopts REF5040, linear voltage regulator to adopt LM1117.

8. single-phase sine wave frequency-converting power supply as claimed in claim 1, it is characterised in that secondary power system includes+12V Power supply circuits ,+5V power supply circuits and -5V power supply circuits；+ 12V power supply circuits are connected in series in system dc input, and+5V powers Circuit and -5V power supply circuits are connected in series in respectively after+12V power supplies.

9. single-phase sine wave frequency-converting power supply as claimed in claim 8, it is characterised in that+12V power supply circuits are using drop The pressure BUCK circuits built of chip TPS54160 ,+5V power supply circuits are that the BUCK built using step-down chip TPS54340 is electric Road, -5V power supply circuits are the BUCK-BOOST circuits built using step-down chip TPS54340.

10. single-phase sine wave frequency-converting power supply as claimed in claim 6, it is characterised in that protection system include triode, Light emitting diode and relay circuit；Relay circuit is arranged in system dc input, and the control end of protection system is connected to After single-chip I/O mouth, and by resistance connecting triode base stage.