CN209375463U - A new type of single-phase sine wave variable frequency variable voltage power supply system - Google Patents

Abstract

The utility model relates to the technical field of power supply, in particular to a novel single-phase sine wave variable frequency and variable voltage power supply system. The system uses FGPA and a single-chip microcomputer as the control core, and a BOOST boost module based on a half-bridge structure and a full-bridge inverter module. The main circuit is designed and manufactured with a single-phase inverter power supply with input 10‑15V DC, inverter output 30‑36V AC, and rated power 72W. The power supply efficiency is higher than 90%, the load regulation rate is less than 0.5%, the effective value of the output AC voltage is adjustable from 30-36V, and the frequency is adjustable in steps of 20-100Hz. The system uses FPGA to generate PWM wave to control BOOST boost circuit, and SPWM wave to control full bridge circuit. It also includes a voltage and current sampling module, an auxiliary power supply module, a protection module, a keyboard module, and a display module, which have functions such as input undervoltage and overvoltage protection, output overcurrent protection, and display of input voltage, output voltage, frequency, and current.

Description

A new type of single-phase sine wave variable frequency variable voltage power supply system

technical field

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

Background technique

At present, there are mainly traditional inverter power supply and digital inverter power supply on the market. The traditional inverter power supply uses a transformer, the circuit is bulky and inefficient, the output voltage is unstable, there are no various protection measures, and some digital inverter power supplies cannot be adjusted. Frequency, unable to monitor and adjust the output voltage, and expensive, so it is necessary to design a DC input, output to provide high-quality AC, high efficiency, low noise, adjustable voltage, adjustable frequency, with various protection and self-recovery Small and medium power sine wave inverter power supply with good functions, good human-computer interaction and low price.

Utility model content

The purpose of this utility model is to provide a DC input in a certain range, the output provides high-quality AC power, high efficiency, low noise, adjustable voltage, adjustable frequency, various protection and self-recovery functions, and good human-computer interaction. Power sine wave inverter power supply.

In order to achieve the above object, the technical solution adopted by the utility model is: a novel single-phase sine wave variable frequency and variable voltage power supply system, including a BOOST boost module based on a half-bridge structure, a full-bridge inverter module, a voltage and current sampling module, and an FPGA And single-chip control module, auxiliary power supply module, protection module, keyboard module, display module; protection module, BOOST step-up module, full-bridge inverter module are connected in turn as the main circuit; voltage and current sampling module for input terminal voltage and output terminal voltage current Sampling; FPGA and single-chip microcomputer control module are respectively connected with BOOST step-up module, full-bridge inverter module, voltage and current sampling module and protection module to realize circuit control, and connected with keyboard module and display module to realize human-computer interaction; auxiliary power module is input from Take power from the terminal to generate the voltage required for the operation of each chip in the system.

In the above-mentioned new single-phase sine wave variable frequency and variable voltage power supply system, the BOOST boost module based on the half-bridge structure includes a 1mH inductor with a magnetic core of EE55/28/25, three 1.2mm diameter enameled wires, and a 10mF electrolytic capacitor with a withstand voltage of 100V, two MOSFET switch tubes CSD19536 and a half-bridge driver chip UCC27211 based on the gate bootstrap drive principle, PWM wave control half-bridge driver chip with adjustable duty cycle output by FPGA and microcontroller control module .

In the above novel single-phase sine wave variable frequency and variable voltage power supply system, the full bridge inverter module includes a full bridge circuit and an LC filter circuit; the full bridge circuit includes four MOSFET switch tubes to form a full bridge, and two half bridge drive circuits Drive; LC filter circuit includes EE55/28/25 magnetic core, 1mH inductor wound by 3 strands of 1.2mm diameter enameled wire and 10μF CBB capacitor, which are used to filter out high frequency components output by the full bridge circuit.

In the above-mentioned new single-phase sine wave variable frequency variable voltage power supply system, the main body of the voltage and current sampling module is an analog-to-digital conversion circuit, including a chip TLC3578 with a sampling range of ±10V, a reference voltage chip REF5040 and a linear voltage regulator LM1117. The DC voltage at the terminal and the AC voltage and current at the output terminal are sampled, and the collected data is sent to the control module as circuit feedback; the voltage at the input terminal is DC, and the sampling is performed after the resistor divides the voltage, and the voltage and current at the output terminal are AC. The voltage mutual inductance circuit and the current mutual inductance circuit built by the transformer TV1013, TA1015 and two operational amplifier chips OPA2227 with two operational amplifiers in them are then sampled.

In the above-mentioned new single-phase sine wave variable frequency and variable voltage power supply system, the protection module includes a 5V power supply relay SRD-05VDC-SL-C, a transistor S9013, a diode 1N4148 and a light emitting diode 3RR4-Y-T; the relay is connected in series at the input end of the system , the control terminal of the protection module is connected with the FPGA and the single-chip microcomputer control module.

In the above-mentioned novel single-phase sine wave variable frequency and variable voltage power supply system, the FPGA and single-chip microcomputer control module include a single-chip microcomputer MSP430F6638, an FPGA development board with cyclone II as the core; used to receive the data output by the voltage and current sampling module, and control the PWM wave. The duty cycle and the frequency of the SPWM wave are adjusted, and the circuit protection is realized by controlling the protection module.

In the above-mentioned new single-phase sine wave variable frequency and variable voltage power supply system, the auxiliary power supply module includes a +12V power supply circuit, a +5V power supply circuit and a -5V power supply circuit; the auxiliary power supply module takes power from the input terminal and inputs the +5V power supply circuit , the +12V power supply circuit and the -5V power supply circuit are connected behind the +5V power supply circuit; the +5V power supply circuit uses a step-down converter TPS5430 to step down the input voltage to +5V DC voltage, and the -5V power supply circuit uses a voltage converter LM2663 to convert The +5V voltage is inverted to obtain a -5V DC voltage, and the +12V power supply circuit uses a boost converter TPS61081 to boost +5V to obtain a +12V DC voltage.

The beneficial effect of the utility model: it has input self-adaptation, and can automatically realize stable output for 10V-15V DC input voltage. The effective value of the output AC voltage is adjustable from 30-36V, the frequency is adjustable from 20-100Hz, and the precision is high. Good stability, for 10-15V input and 30-36V output, the system load regulation rate is less than 0.5%. High efficiency, for 10-15V input and 30-36V output, the efficiency is greater than 90% at rated power. With current and voltage display and over-current protection and under-overvoltage protection functions, friendly man-machine interface. Inexpensive and small in size.

Description of drawings

Fig. 1 is an overall circuit module block diagram of an embodiment of the utility model;

Fig. 2 is a circuit diagram of the BOOST step-up module based on the half-bridge structure in an embodiment of the present invention;

Fig. 3 is a circuit diagram of a full-bridge inverter module according to an embodiment of the present invention;

Fig. 4-1 is a voltage mutual inductance circuit diagram of an embodiment of the utility model, Fig. 4-2 is a current mutual inductance circuit diagram of an embodiment of the utility model, and Fig. 4-3 is an analog-to-digital conversion circuit diagram of an embodiment of the utility model;

Fig. 5 is a circuit diagram of a protection module of an embodiment of the present invention;

Fig. 6-1 is a +12V power supply circuit diagram of an embodiment of the utility model, Fig. 6-2 is a +5V power supply circuit diagram of an embodiment of the utility model, and Fig. 6-3 is a 5V power supply circuit diagram of an embodiment of the utility model.

Detailed ways

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

As shown in Figure 1, a novel single-phase sine wave variable frequency and variable voltage power supply system in this embodiment includes a BOOST boost module based on a half-bridge structure, a full-bridge inverter module, a voltage and current sampling module, an FPGA and a single-chip microcomputer control module, Auxiliary power supply module, protection module, keyboard module, display module. The protection module, BOOST boost module, and full-bridge inverter module are connected in turn as the main circuit. The voltage and current sampling module samples the DC voltage at the input end and the AC voltage and current at the output end. The bridge inverter module, the voltage and current sampling module and the protection module are connected for circuit control, connected with the keyboard module and the display module for human-computer interaction, and the auxiliary power module takes power from the input terminal to generate the voltage required for the operation of each chip in the system.

As shown in Figure 2, the two MOSFET switches in the BOOST boost module based on the half-bridge structure choose CSD19536, and the two switch tubes form a half-bridge structure. , The main inductor in the BOOST topology uses EE55/28/25 magnetic core, and the inductor is wound by three strands of 1.2mm diameter enameled wire. The inductance value is 1mH. The half-bridge low-side switching tube is implemented, and the diode in the topology is replaced with a half-bridge high-side switching tube to reduce circuit loss. The positive electrode of the input voltage is connected to the source of the high-side switch Q1 and the drain of the low-side switch Q2 through the main inductor, the source of the low-side switch Q2 is grounded, and the drain of the high-side switch Q1 is connected to the positive electrode of the 10mF main capacitor C1 connected, the negative pole of the main capacitor C1 is grounded, and the voltage across the main capacitor is the output voltage of the BOOST step-up module. The VSS terminal of the half-bridge driver chip UCC27211 is grounded, VDD is connected to the +12V output of the auxiliary power supply module, and connected to the decoupling capacitor for decoupling, and the LI and HI two input ports respectively receive two mutually mirrored PWM outputs from the FPGA and the single-chip control module Wave, HB and HS are connected to both ends of the 150nF bootstrap capacitor C2, and the HS terminal is connected to the connection point of Q1Q2, the HO terminal is connected to the gate of the high-side switch Q1 through the drive resistor, and the LO terminal is connected to the low-side switch tube through the drive resistor The gate of Q2 is connected, and the drive resistor is connected in parallel with a diode to shorten the turn-off time of the switch tube. Both the gate and source electrodes of the high-side switch tube Q1 and the low-side switch tube Q2 are connected with a discharge resistor.

As shown in Figure 3, the full-bridge inverter module is composed of a full-bridge circuit and an LC filter circuit. The full-bridge circuit is mainly composed of half-bridge driver chips UCC27211U1, U2, the first half-bridge high-side switch CSD19536Q1, the first half-bridge low-side switch CSD19536Q2, the second half-bridge high-side switch CSD19536Q3, and the second half-bridge high-side switch Tube CSD19536Q4; LC filter circuit is composed of EE55/28/25 magnetic core with 3 strands of 1.2mm diameter enameled wire winding 1mH inductance L1 and 10μF CBB capacitor C1. The positive pole of the DC output of the BOOST boost module is connected to the drains of Q1 and Q3, the ground of the DC output of the BOOST boost module is connected to the sources of Q2 and Q4, the source of Q1 is connected to the drain of Q2, and is connected to the U1HS terminal, The inductance of the LC filter circuit is connected, the source of Q3 is connected to the drain of Q4, and is connected to the U2HS terminal and the capacitor of the LC filter circuit. The VDD terminals of U1 and U2 are connected to the +12V output of the auxiliary power module, the VSS terminal is grounded, the HI of U1 and the LI of U2 are connected to the same SPWM wave control signal, and the LI of U1 and HI of U2 are connected to another mirrored SPWM wave Control signal, HB and HS of U1 and U2 are respectively connected to both ends of the bootstrap capacitor, HO of U1 is connected to the gate of Q1 through a driving resistor, LO of U1 is connected to Q2 through a driving resistor, HO of U2 is connected to Q3 through a driving resistor The gate is connected, and the LO of U2 is connected to Q4 through a driving resistor, and the driving resistors are connected in parallel with the diode. The gates and sources of Q1, Q2, Q3, and Q4 are all connected to discharge resistors.

As shown in Figures 4-1, 4-2, and 4-3, the voltage and current sampling module includes a voltage mutual inductance circuit, a current mutual inductance circuit, and an analog-to-digital conversion circuit to sample and measure the input voltage, output voltage, and output current. The +5V and -5V voltages output by the auxiliary power supply module are decoupled in parallel with 10uF tantalum capacitors and 0.1uF chip capacitors and connected to the places marked with corresponding voltage values in the figure to supply power to the chip. The input voltage is DC, and the analog-to-digital conversion chip TLC3578 is used for analog-to-digital conversion after the resistance is divided; the output voltage and current are AC, and the output voltage and current are converted into weak current signals by the voltage mutual induction circuit and the current mutual induction circuit respectively, and the analog-to-digital conversion chip is used TLC3578 samples the waveform. The voltage mutual induction circuit includes a transformer TV1013-1H and an operational amplifier chip OPA2227 with two operational amplifiers inside. The output voltage is input to the operational amplifier circuit and the third-order filter circuit built by the operational amplifier chip OPA2227U4 through the transformer TV1013-1H to obtain the sampling voltage of the output voltage. The current mutual induction circuit is input to the operational amplifier circuit and the third-order filter circuit built by the operational amplifier chip OPA2227U5 through the transformer TA1015-2 to obtain the sampling voltage of the output current. The analog-to-digital conversion circuit includes a 14-bit, 8-channel low-power analog-to-digital conversion chip TLC3578U1, a reference voltage chip REF5040U2 and a linear voltage regulator LM1117U3. The reference voltage chip provides a 4.096V reference voltage with high precision, low noise and low drift, and the linear regulator provides a +3.3V voltage. The SCLK, SDI, EOC, SDO, and CS pins of the analog-to-digital conversion chip LTC3578 are all connected to the FPGA and the IO port of the MCU control module through a 10Ω resistor. The COMP pin is connected to the 0.1uF capacitor to the analog ground, the REFM pin is connected to the analog ground, the REFP pin is connected to the 4.096V reference voltage output by the reference voltage chip REF5040, and the sampling voltage input is connected to the analog signal through a 100Ω resistor and a 10uF capacitor low-pass filter input pin.

Further, the FPGA and single-chip microcomputer control module includes a single-chip microcomputer MSP430F6638, and an FPGA development board with cyclone II as the core; it is used to receive the data output by the voltage and current sampling module, calculate the effective value of the input voltage and output current, and judge whether the input voltage is insufficient or not. If there is an abnormal situation, adjust the duty cycle of the PWM wave and the frequency of the SPWM wave to start the protection module and output a high level to the protection module to cut off the positive input of the main circuit. Open to achieve circuit protection.

Further, the 4*4 matrix keyboard inputs the required voltage effective value and frequency, and the FPGA and the single-chip microcomputer control module calculate and compare the effective value of the output voltage with the set value through output voltage sampling, and use the PID algorithm to adjust the output to the BOOST booster circuit. PWM wave, so that the output voltage is stabilized at the required voltage effective value. The FPGA and the single-chip microcomputer control module set the frequency of the SPWM wave output to the full-bridge inverter circuit according to the set frequency, so that the output signal is the required frequency. And the input voltage, output voltage, current, frequency and other information are displayed on the LCD screen, and the human-computer interaction is good.

As shown in Figure 5, the protection module uses the relay SRD-05VDC-SL-C, the output voltage of an I/O port of the FPGA and the single-chip microcomputer control module is used as the Vcon control voltage, and the high-level control transistor S9013 drives the relay through the I/O port Disconnect the input positive pole to realize over-current protection.

As shown in Figure 6-1, 6-2, and 6-3, the auxiliary power supply module includes a +12V power supply circuit, a +5V power supply circuit, and a -5V power supply circuit. The auxiliary power supply module takes power from the input terminal, and inputs +5V power supply circuit, +12V power supply circuit and -5V power supply circuit and is connected behind the +5V power supply circuit. The +5V power supply circuit uses the step-down converter TPS5430 to step down the input voltage to +5V DC voltage, the -5V power supply circuit uses the voltage converter LM2663 to invert the +5V voltage to obtain -5V DC voltage, and the +12V power supply circuit uses boost conversion tor TPS61081 boost to get

+12V DC voltage. +12V DC voltage supplies power to three driver chips UCC27211, +5V DC voltage supplies power to FPGA, MCU, analog-to-digital conversion chip TLC3578, reference voltage chip REF5040, linear regulator chip LM1117, operational amplifier chip OPA2227, relay power supply, -5V DC voltage Supply negative voltage to OPA2227.

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 substance. The scope of the invention is limited only by the appended claims.

Claims (7)

1. A novel single-phase sine wave variable frequency and variable voltage power supply system is characterized in that it includes a BOOST boost module based on a half-bridge structure, a full-bridge inverter module, a voltage and current sampling module, an FPGA and a single-chip microcomputer control module, and an auxiliary power supply module , protection module, keyboard module, and display module; the protection module, BOOST step-up module, and full-bridge inverter module are connected in turn as the main circuit; the voltage and current sampling module samples the input voltage and output voltage and current; FPGA and single-chip control module Connect with BOOST boost module, full-bridge inverter module, voltage and current sampling module and protection module respectively to realize circuit control, and connect with keyboard module and display module to realize human-computer interaction; the auxiliary power module takes power from the input terminal to generate each The voltage required for the chip to work. 2. The new single-phase sine wave variable frequency and variable voltage power supply system according to claim 1, wherein the BOOST boost module based on the half-bridge structure includes a magnetic core of EE55/28/25, 3 strands of 1.2mm A 1mH inductor with a diameter of enameled wire, a 10mF electrolytic capacitor with a withstand voltage of 100V, two MOSFET switch tubes CSD19536 and a half-bridge driver chip UCC27211 based on the gate bootstrap drive principle, the duty cycle of the output of the FPGA and the microcontroller control module can be The tuned PWM wave controls the half-bridge driver chip. 3. The novel single-phase sine wave variable frequency variable voltage power supply system as claimed in claim 1 is characterized in that, the full bridge inverter module comprises a full bridge circuit and an LC filter circuit; the full bridge circuit comprises four MOSFET switching tubes to form Full bridge, driven by two half bridge drive circuits; LC filter circuit includes EE55/28/25 magnetic core, 1mH inductor wound by 3 strands of 1.2mm diameter enameled wire and 10μFCBB capacitor, used to filter out the high frequency output by the full bridge circuit Element. 4. The novel single-phase sine wave variable frequency variable voltage power supply system as claimed in claim 1, characterized in that the main body of the voltage and current sampling module is an analog-to-digital conversion circuit, including a chip TLC3578 with a sampling range of ±10V, a reference voltage chip REF5040 And the linear regulator LM1117, samples the DC voltage at the input terminal, the AC voltage at the output terminal, and the AC current, and sends the collected data to the control module as circuit feedback; the input terminal voltage is DC, and the sampling is performed after the resistor divides the voltage , the output terminal voltage and current are alternating current, and the voltage mutual inductance circuit and current mutual inductance circuit built by the transformer TV1013, TA1015 and two operational amplifier chips OPA2227 with two operational amplifiers in them are respectively sampled. 5. The novel single-phase sine wave variable frequency and variable voltage power supply system according to claim 1, wherein the protection module includes a 5V power supply relay SRD-05VDC-SL-C, a triode S9013, a diode 1N4148 and a light emitting diode 3RR4- Y-T; the relay is connected in series at the input end of the system, and the control end of the protection module is connected with the FPGA and the single-chip microcomputer control module. 6. The novel single-phase sine wave variable frequency variable voltage power supply system as claimed in claim 2 is characterized in that, said FPGA and single-chip microcomputer control module comprise single-chip microcomputer MSP430F6638, take cyclone II as the core FPGA development board; for receiving voltage and current sampling The data output by the module adjusts the duty cycle of the PWM wave and the frequency of the SPWM wave, and realizes circuit protection by controlling the protection module. 7. The novel single-phase sine wave variable frequency variable voltage power supply system as claimed in claim 2 is characterized in that, the auxiliary power supply module includes a +12V power supply circuit, a +5V power supply circuit and a -5V power supply circuit; the auxiliary power supply module is input from Take power from the terminal, input +5V power supply circuit, +12V power supply circuit and -5V power supply circuit are connected behind the +5V power supply circuit; +5V power supply circuit uses step-down converter TPS5430 to step down the input voltage to +5V DC voltage, - The 5V power supply circuit uses a voltage converter LM2663 to invert the +5V voltage to obtain a -5V DC voltage, and the +12V power supply circuit uses a boost converter TPS61081 to boost +5V to obtain a +12V DC voltage.