CN113572371B - Pure sine wave AC constant voltage stable power supply - Google Patents

Pure sine wave AC constant voltage stable power supply Download PDF

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Publication number
CN113572371B
CN113572371B CN202110926905.1A CN202110926905A CN113572371B CN 113572371 B CN113572371 B CN 113572371B CN 202110926905 A CN202110926905 A CN 202110926905A CN 113572371 B CN113572371 B CN 113572371B
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capacitor
pin
resistor
circuit
voltage
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CN113572371A (en
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傅胜江
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Yueqing Lexiang Electrical Co ltd
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Yueqing Lexiang Electrical Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a pure sine wave AC constant voltage stable power supply, which comprises: the rectification filter circuit is connected with the power grid, filters alternating current transmitted by the power grid and outputs direct current voltage through rectification; a booster circuit connected to the rear stage of the rectifying filter circuit for boosting the DC voltage output by the rectifying filter circuit; an inverter circuit connected to the rear stage of the booster circuit to perform inversion processing on the boosted DC voltage, thereby obtaining an AC output voltage; wherein, connect with making the first drive circuit of the direct-current voltage after boosting invariable in the boost circuit; the inverter circuit is connected with a second driving circuit which makes the output voltage constant so as to obtain pure sine wave voltage. The invention has the following advantages and effects: the invention has fast dynamic response, outputs pure sine wave voltage and uses electrical equipment to operate safely and reliably.

Description

Pure sine wave AC constant voltage stable power supply
Technical Field
The invention relates to the technical field of voltage-stabilized power supplies, in particular to a pure sine wave alternating-current constant-voltage stable power supply.
Background
In practical applications, the unstable ac voltage input by the power grid may cause fatal damage to the power utilization equipment, affect production, cause unstable product quality, and other losses in many aspects, so that a voltage stabilizer is required to keep the output voltage and current stable. However, the conventional voltage stabilizer has slow dynamic response and cannot effectively maintain the output voltage constant in time.
Disclosure of Invention
The invention aims to provide a pure sine wave alternating current constant voltage stable power supply to solve the problems in the background technology.
The technical purpose of the invention is realized by the following technical scheme: a pure sine wave AC constant voltage stable power supply comprises:
the rectification filter circuit is connected with the power grid, filters alternating current transmitted by the power grid, and outputs direct current voltage through rectification;
a booster circuit connected to the rear stage of the rectifier filter circuit for boosting the DC voltage output by the rectifier filter circuit;
an inverter circuit connected to the rear stage of the booster circuit for inverting the boosted dc voltage to obtain an ac output voltage;
wherein, the first drive circuit which makes the boosted DC voltage constant is connected with the boosting circuit;
the inverter circuit is connected with a second driving circuit which enables the output voltage to be constant, so that pure sine wave voltage is obtained.
The further setting is that: the boost circuit at least comprises an energy storage inductor L1, a boost diode D1 and an energy storage capacitor C5, wherein one end of the energy storage inductor L1 is connected to the anode of the rectifier and filter circuit for outputting, the other end of the energy storage inductor L1 is connected to the anode of the boost diode D1, the cathode of the boost diode D1 is connected to the anode of the energy storage capacitor C5, and the cathode of the energy storage capacitor C5 is connected to the cathode of the rectifier and filter circuit for outputting.
The further setting is as follows: the first driving circuit at least comprises a switching tube Q5 and a pulse width modulation chip U1, wherein a collector of the switching tube Q5 is connected with the anode of the boost diode D1, an emitter of the switching tube Q5 is connected with the cathode output of the rectification filter circuit, and a base of the switching tube Q5 is connected to the pulse width modulation chip U1 and is controlled by the pulse width modulation chip U1.
The further setting is as follows: the wide modulation chip U1 controls the on/off of the switching tube Q5 in a mode of generating PWM pulses;
when the pulse width modulation chip U1 generates positive pulse, the switching tube Q5 is conducted, and the energy storage inductor L1 stores energy; when the pulse width modulation chip U1 generates negative pulse, the switching tube Q5 is switched off, the energy storage inductor L1 releases energy to charge the energy storage capacitor C5 through the boost diode D1, the energy storage inductor L1 continuously charges the energy storage capacitor C5 under the action of the high-frequency switch, and constant boost is realized through the energy storage capacitor C5.
The further setting is as follows: the inverter circuit comprises an inverter bridge consisting of four IGBT tubes, and the second drive circuit comprises a feedback circuit connected to the inverter bridge and used for realizing current feedback, and a main control circuit connected with the feedback circuit and connected to the inverter bridge in parallel for performing voltage stabilization control on output voltage.
The further setting is as follows: the feedback circuit comprises a current sampling resistor R19 connected between the inverter bridge and the main control circuit.
The further setting is that: the inverter circuit comprises a low-pass filter, the low-pass filter outputs pure sine wave voltage, and the low-pass filter consists of an inductor L2 and a capacitor C9.
The further setting is that: the main control circuit comprises a main control chip U2, a first driving chip U3, a second driving chip U4, a voltage comparator U5, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a thermistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a potentiometer R34, a diode D12 and a diode D13; the inverter bridge consists of an IGBT tube Q1, an IGBT tube Q2, an IGBT tube Q3 and an IGBT tube Q4;
a VDD pin of a first driving chip U3 is connected to one end of a capacitor C20 and one end of a capacitor C21, the VDD pin is connected to a 5V power supply, the other ends of the capacitor C20 and the capacitor C21 are grounded, an HIN pin of the first driving chip U3 is connected to an SPWMOU3 pin of a main control chip U2, an SD pin of the first driving chip U3 is connected to an OUT1 pin of a voltage comparator U5 after being connected to an SD pin of a second driving chip U4, an LIN pin of the first driving chip U3 is connected to an SPWMOU4 pin of the main control chip U2, and is connected to an LIN pin of the second driving chip U4 and then connected to an SPWMOU2 pin of the main control chip U2, and a VSS pin of the first driving chip U3 is grounded;
a pin HO of the first driving chip U3 is connected with a grid electrode of the IGBT tube Q1, a pin VB of the first driving chip U3 is connected with one end of a capacitor C22 and a cathode of a diode D12, the other end of the capacitor C22 is connected with a pin VS of the first driving chip U3 and a first output end of an inverter bridge, and one end of an inductor L2 is connected with the first output end of the inverter bridge; a VCC pin of the first driving chip U3 is connected with one end of a capacitor C23, one end of a capacitor C24 and the anode of a diode D12, the terminals are simultaneously connected with a 12V power supply, the other end of the capacitor C23 and the other end of the capacitor C24 are connected with a COM pin of the first driving chip U3, the terminals are simultaneously grounded, and an LO pin of the first driving chip U3 is connected with the grid electrode of the IGBT tube Q2;
the VDD pin of the second driving chip U4 is connected to one end of a capacitor C27 and one end of a capacitor C28, the VDD pin is connected to a 5V power supply at the same time, the other ends of the capacitor C27 and the capacitor C28 are grounded, the HIN pin of the second driving chip U4 is connected to the SPWMOU1 pin of the main control chip U2, and the VSS pin of the second driving chip U4 is grounded;
the HO pin of the second driving chip U4 is connected with the grid electrode of the IGBT tube Q3, the VB pin of the second driving chip U4 is connected with one end of a capacitor C29 and the cathode of a diode D13, the other end of the capacitor C29 is connected with the VS pin of the second driving chip U4 and the second output end of an inverter bridge, the VCC pin of the second driving chip U4 is connected with one end of a capacitor C30, one end of a capacitor C31 and the anode of the diode D13, the ends are simultaneously connected with a 12V power supply, the other end of the capacitor C31 at the other end of the capacitor C30 is connected with the COM pin of the second driving chip U4, the ends are simultaneously grounded, and the LO pin of the second driving chip U4 is connected with the grid electrode of the IGBT tube Q4;
the VCC pin of the voltage comparator U5 is connected to a 5V power supply, the OUT2 pin of the voltage comparator U5 is connected to one end of a resistor R24, the other end of the resistor R24 is connected to one end of a resistor R23, one end of a capacitor C32 and the SPWMEN pin of the main control chip U2, the other end of the capacitor C32 is grounded, the other end of the resistor R23 is connected to one end of a resistor R22 and the 5V power supply, the other end of the resistor R22 is connected to one end of a capacitor C39 and the OUT1 pin of the voltage comparator U5, the other end of the capacitor C39 is grounded, the INB1 pin of the voltage comparator U5 is connected to the IFB pin of the main control chip U2, the end is simultaneously connected to the INA2 pin of the voltage comparator U5, the resistor R29 is connected between the OUT1 pin and the INA2 pin of the voltage comparator U5, the INB2 pin of the voltage comparator U5 is connected to the INA1 pin, and the GND pin of the voltage comparator U5 is grounded;
the INB2 pin of the voltage comparator U5 is also connected with one end of a resistor R25, one end of a resistor R30 and one end of a capacitor C4O, the other end of the resistor R30 and the other end of the capacitor C4O are grounded, the other end of the resistor R25 is connected with one end of a capacitor C33, one end of a capacitor C34 and one end of a thermistor R27, the other ends of the resistors are simultaneously connected to a 5V power supply, the other end of the capacitor C33 and the other end of the capacitor C34 are grounded, the other end of the thermistor R27 is connected with one end of a capacitor C37 and one end of a resistor R26, the other end of the capacitor C37 is grounded, the other end of the resistor R26 is connected with one end of a capacitor C35 and the TFB pin of the main control chip U2, and the other end of the capacitor C35 is grounded;
the INB1 pin of the voltage comparator U5 is also connected with one end of a capacitor C36 and one end of a resistor R28, the other end of the capacitor C36 is grounded, and the other end of the resistor R28 is connected to an inverter bridge;
the VFB pin of the main control chip U2 is connected to one end of a capacitor C38 and one end of a resistor R31, the other end of the capacitor C38 is grounded, the other end of the resistor R31 is connected to one end of a capacitor C41, one end of a resistor R32, one end of a resistor R33 and one end of a potentiometer R34, the other end of the resistor R33 is connected to the other end of an inductor L2 and one end of a capacitor C9, the other end of the capacitor C9 is connected to a second output end of the inverter bridge, and the other end of the capacitor C41, the other end of the resistor R32 and the other end of the potentiometer R34 are grounded.
The invention has the beneficial effects that:
the invention has fast dynamic reaction, outputs pure sine wave voltage and uses electrical equipment to operate safely and reliably; the purpose of constant voltage output is achieved through the control of double voltage stabilization formed by the first driving circuit and the second driving circuit. The invention has no heavy power frequency transformer, only has one high-frequency energy storage inductor L1, the volume is greatly reduced, the weight is only 1 percent of that of a power frequency stabilized power supply, a large amount of copper and iron materials can be saved, the energy is saved, the environment is protected, the transportation cost is saved, and the integral production cost of the stabilized power supply is reduced.
Drawings
FIG. 1 is a functional block diagram of an embodiment;
FIG. 2 is a circuit diagram of a rectifying-filtering circuit in an embodiment;
FIG. 3 is a circuit diagram of a booster circuit and a first driver circuit in the embodiment;
FIG. 4 is a circuit diagram of an inverter circuit according to an embodiment;
FIG. 5 is a first circuit diagram of a second driving circuit in an embodiment;
FIG. 6 is a second circuit diagram of a second driving circuit in the embodiment.
In the figure: 1. a rectification filter circuit; 2. a boost circuit; 3. an inverter circuit; 4. a first drive circuit; 5. a second drive circuit; 51. a master control circuit; 52. a feedback circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 6, a pure sine wave ac constant voltage stable power supply includes:
a rectification filter circuit 1 connected with the power grid, filtering the alternating current transmitted by the power grid, and outputting direct current voltage through rectification;
a booster circuit 2 connected to the rear stage of the rectifying and filtering circuit 1 for boosting the dc voltage output from the rectifying and filtering circuit;
an inverter circuit 3 connected to a subsequent stage of the booster circuit 2 to invert the boosted dc voltage to obtain an ac output voltage;
wherein, the first drive circuit 4 which makes the DC voltage after boosting constant is connected with the booster circuit 2;
the inverter circuit 3 is connected to a second drive circuit 5 which makes the output voltage constant and obtains a pure sine wave voltage.
Wherein, boost circuit 2 is including energy storage inductance L1, boost diode D1 and energy storage capacitor C5 at least, energy storage inductance L1's one end connect at rectifier and filter circuit 1's anodal output, energy storage inductance L1's the other end is connected at boost diode D1's positive pole, boost diode D1's negative pole is connected at energy storage capacitor C5's positive pole, energy storage capacitor C5's negative pole is connected at rectifier and filter circuit 1's negative pole output.
The first driving circuit 4 at least comprises a switching tube Q5 and a pulse width modulation chip U1, wherein a collector of the switching tube Q5 is connected with the anode of the boost diode D1, an emitter of the switching tube Q5 is connected with the cathode output of the rectification filter circuit 1, and a base of the switching tube Q5 is connected to the pulse width modulation chip U1 and controlled by the pulse width modulation chip U1.
The wide modulation chip U1 controls the on/off of the switching tube Q5 in a mode of generating PWM pulses;
when the pulse width modulation chip U1 generates positive pulse, the switching tube Q5 is conducted, and the energy storage inductor L1 stores energy; when the pulse width modulation chip U1 generates negative pulse, the switching tube Q5 is switched off, the energy storage inductor L1 releases energy to charge the energy storage capacitor C5 through the boost diode D1, the energy storage inductor L1 continuously charges the energy storage capacitor C5 under the action of the high-frequency switch, and constant boost is realized through the energy storage capacitor C5.
In this embodiment, a dc voltage of about 400V is generated at two ends of the energy storage capacitor C5, and since the PWM pulse is adjustable, the UC3842 chip introduces a feedback signal to perform closed-loop pulse width modulation on the PWM signal, and the adjustment speed reaches a microsecond level, the output dc voltage is nearly constant, and the constant dc voltage provides sufficient energy for the pure sine wave inverter circuit 3 at the subsequent stage.
The inverter circuit 3 comprises an inverter bridge composed of four IGBT transistors, and the second driving circuit 5 comprises a feedback circuit 52 connected to the inverter bridge for current feedback, and a main control circuit 51 connected to the feedback circuit 52 and connected to the inverter bridge for voltage stabilization control of output voltage.
The feedback circuit 52 includes a current sampling resistor R19 connected between the inverter bridge and the main control circuit 51.
The inverter circuit 3 comprises a low-pass filter, and outputs pure sine wave voltage through the low-pass filter, wherein the low-pass filter consists of an inductor L2 and a capacitor C9.
The main control circuit 51 includes a main control chip U2, a first driving chip U3, a second driving chip U4, a voltage comparator U5, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a thermistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a potentiometer R34, a diode D12, and a diode D13; the inverter bridge consists of an IGBT tube Q1, an IGBT tube Q2, an IGBT tube Q3 and an IGBT tube Q4;
a VDD pin of a first driving chip U3 is connected to one end of a capacitor C20 and one end of a capacitor C21, the VDD pin is connected to a 5V power supply, the other ends of the capacitor C20 and the capacitor C21 are grounded, an HIN pin of the first driving chip U3 is connected to an SPWMOU3 pin of a main control chip U2, an SD pin of the first driving chip U3 is connected to an OUT1 pin of a voltage comparator U5 after being connected to an SD pin of a second driving chip U4, an LIN pin of the first driving chip U3 is connected to an SPWMOU4 pin of the main control chip U2, and is connected to an LIN pin of the second driving chip U4 and then connected to an SPWMOU2 pin of the main control chip U2, and a VSS pin of the first driving chip U3 is grounded;
a pin HO of the first driving chip U3 is connected with a grid electrode of the IGBT tube Q1, a pin VB of the first driving chip U3 is connected with one end of a capacitor C22 and a cathode of a diode D12, the other end of the capacitor C22 is connected with a pin VS of the first driving chip U3 and a first output end of an inverter bridge, and one end of an inductor L2 is connected with the first output end of the inverter bridge; a VCC pin of the first driving chip U3 is connected with one end of a capacitor C23, one end of a capacitor C24 and the anode of a diode D12, the terminals are simultaneously connected with a 12V power supply, the other end of the capacitor C23 and the other end of the capacitor C24 are connected with a COM pin of the first driving chip U3, the terminals are simultaneously grounded, and an LO pin of the first driving chip U3 is connected with the grid electrode of the IGBT tube Q2;
the VDD pin of the second driving chip U4 is connected to one end of a capacitor C27 and one end of a capacitor C28, the VDD pin is connected to a 5V power supply at the same time, the other ends of the capacitor C27 and the capacitor C28 are grounded, the HIN pin of the second driving chip U4 is connected to the SPWMOU1 pin of the main control chip U2, and the VSS pin of the second driving chip U4 is grounded;
the HO pin of the second driving chip U4 is connected with the grid electrode of the IGBT tube Q3, the VB pin of the second driving chip U4 is connected with one end of a capacitor C29 and the cathode of a diode D13, the other end of the capacitor C29 is connected with the VS pin of the second driving chip U4 and the second output end of an inverter bridge, the VCC pin of the second driving chip U4 is connected with one end of a capacitor C30, one end of a capacitor C31 and the anode of the diode D13, the ends are simultaneously connected with a 12V power supply, the other end of the capacitor C31 at the other end of the capacitor C30 is connected with the COM pin of the second driving chip U4, the ends are simultaneously grounded, and the LO pin of the second driving chip U4 is connected with the grid electrode of the IGBT tube Q4;
a VCC pin of a voltage comparator U5 is connected to a 5V power supply, an OUT2 pin of the voltage comparator U5 is connected to one end of a resistor R24, the other end of the resistor R24 is connected to one end of a resistor R23, one end of a capacitor C32 and an SPWMEN pin of a main control chip U2, the other end of the capacitor C32 is grounded, the other end of the resistor R23 is connected to one end of a resistor R22 and the 5V power supply, the other end of the resistor R22 is connected to one end of a capacitor C39 and an OUT1 pin of the voltage comparator U5, the other end of the capacitor C39 is grounded, an INB1 pin of the voltage comparator U5 is connected to an IFB pin of the main control chip U2, the ends are simultaneously connected to an INA2 pin of the voltage comparator U5, a resistor R29 is connected between the OUT1 pin and the INA2 pin of the voltage comparator U5, the INB2 pin of the voltage comparator U5 is connected to the INA1 pin, and a GND pin of the voltage comparator U5 is grounded;
the INB2 pin of the voltage comparator U5 is also connected to one end of a resistor R25, one end of a resistor R30 and one end of a capacitor C4O, the other end of the resistor R30 and the other end of the capacitor C4O are grounded, the other end of the resistor R25 is connected to one end of a capacitor C33, one end of a capacitor C34 and one end of a thermistor R27, the ends are simultaneously connected to a 5V power supply, the other end of the capacitor C33 and the other end of the capacitor C34 are both grounded, the other end of the thermistor R27 is connected to one end of a capacitor C37 and one end of a resistor R26, the other end of the capacitor C37 is grounded, the other end of the resistor R26 is connected to one end of a capacitor C35 and the TFB pin of the main control chip U2, and the other end of the capacitor C35 is grounded;
the INB1 pin of the voltage comparator U5 is also connected with one end of a capacitor C36 and one end of a resistor R28, the other end of the capacitor C36 is grounded, and the other end of the resistor R28 is connected to an inverter bridge;
the VFB pin of the main control chip U2 is connected to one end of a capacitor C38 and one end of a resistor R31, the other end of the capacitor C38 is grounded, the other end of the resistor R31 is connected to one end of a capacitor C41, one end of a resistor R32, one end of a resistor R33 and one end of a potentiometer R34, the other end of the resistor R33 is connected to the other end of an inductor L2 and one end of a capacitor C9, the other end of the capacitor C9 is connected to a second output end of the inverter bridge, and the other end of the capacitor C41, the other end of the resistor R32 and the other end of the potentiometer R34 are grounded.
It should be noted that in this embodiment, the model of the pulse width modulation chip U1 is UC3842, the model of the main control chip U2 is STM32, the models of the first driving chip U3 and the second driving chip U4 are both IR2110S, and the model of the voltage comparator U5 is LM393.
Output feedback carries out closed-loop control to main control chip U2 and removes the pulse width utmost point valuation of adjusting SPWM pulse signal, makes output voltage steady voltage control once more, lets output voltage more stable, and this power can reach the purpose of constant voltage output through the control of dual steady voltage.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (5)

1. A pure sine wave AC constant voltage stable power supply is characterized by comprising:
a rectification filter circuit (1) which is connected with the power grid, filters the alternating current transmitted by the power grid and outputs direct current voltage through rectification;
a booster circuit (2) connected to the rear stage of the rectifying and filtering circuit (1) for boosting the DC voltage output by the rectifying and filtering circuit;
an inverter circuit (3) connected to the subsequent stage of the booster circuit (2) for inverting the boosted dc voltage to obtain an ac output voltage;
wherein, a first drive circuit (4) which makes the boosted DC voltage constant is connected with the booster circuit (2);
the inverter circuit (3) is connected with a second driving circuit (5) which enables the output voltage to be constant so as to obtain pure sine-wave voltage;
the inverter circuit (3) comprises an inverter bridge consisting of four IGBT tubes, and the second drive circuit (5) comprises a feedback circuit (52) connected to the inverter bridge and used for realizing current feedback, and a main control circuit (51) connected with the feedback circuit (52) and connected to the inverter bridge in parallel for performing voltage stabilization control on output voltage;
the inverter circuit (3) comprises a low-pass filter, the low-pass filter outputs pure sine wave voltage, and the low-pass filter consists of an inductor L2 and a capacitor C9;
the main control circuit (51) comprises a main control chip U2, a first driving chip U3, a second driving chip U4, a voltage comparator U5, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a capacitor C29, a capacitor C30, a capacitor C31, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a thermistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a potentiometer R34, a diode D12 and a diode D13; the inverter bridge consists of an IGBT tube Q1, an IGBT tube Q2, an IGBT tube Q3 and an IGBT tube Q4;
a VDD pin of a first driving chip U3 is connected to one end of a capacitor C20 and one end of a capacitor C21 and is simultaneously connected to a 5V power supply, the other ends of the capacitor C20 and the capacitor C21 are grounded, a HIN pin of the first driving chip U3 is connected to a SPWMOU3 pin of a main control chip U2, an SD pin of the first driving chip U3 is connected to an SD pin of a second driving chip U4 and then is connected to an OUT1 pin of a voltage comparator U5, an LIN pin of the first driving chip U3 is connected to a SPWMOU4 pin of the main control chip U2, meanwhile, the LIN pin of the second driving chip U4 is connected to an SPWMOU2 pin of the main control chip U2 and a VSS pin of the first driving chip U3 is grounded;
a pin HO of the first driving chip U3 is connected with a grid electrode of the IGBT tube Q1, a pin VB of the first driving chip U3 is connected with one end of a capacitor C22 and a cathode of a diode D12, the other end of the capacitor C22 is connected with a pin VS of the first driving chip U3 and a first output end of an inverter bridge, and one end of an inductor L2 is connected with the first output end of the inverter bridge; a VCC pin of the first driving chip U3 is connected to one end of a capacitor C23, one end of a capacitor C24 and the anode of a diode D12, and is connected to a 12V power supply, the other end of the capacitor C23 and the other end of the capacitor C24 are connected to a COM pin of the first driving chip U3 and are grounded, and an LO pin of the first driving chip U3 is connected to the gate of the IGBT tube Q2;
the VDD pin of the second driving chip U4 is connected to one ends of the capacitor C27 and the capacitor C28 and is simultaneously connected to a 5V power supply, the other ends of the capacitor C27 and the capacitor C28 are grounded, the HIN pin of the second driving chip U4 is connected to the SPWMOU1 pin of the main control chip U2, and the VSS pin of the second driving chip U4 is grounded;
the HO pin of the second driving chip U4 is connected to the grid of the IGBT tube Q3, the VB pin of the second driving chip U4 is connected to one end of a capacitor C29 and the cathode of a diode D13, the other end of the capacitor C29 is connected to the VS pin of the second driving chip U4 and the second output end of the inverter bridge, the VCC pin of the second driving chip U4 is connected to one end of a capacitor C30, one end of a capacitor C31 and the anode of the diode D13 and is simultaneously connected to a 12V power supply, the other end of the capacitor C31 at the other end of the capacitor C30 is connected to the COM pin of the second driving chip U4 and is simultaneously grounded, and the LO pin of the second driving chip U4 is connected to the grid of the IGBT tube Q4;
a VCC pin of a voltage comparator U5 is connected to a 5V power supply, an OUT2 pin of the voltage comparator U5 is connected to one end of a resistor R24, the other end of the resistor R24 is connected to one end of a resistor R23, one end of a capacitor C32 and an SPWMEN pin of a main control chip U2, the other end of the capacitor C32 is grounded, the other end of the resistor R23 is connected to one end of a resistor R22 and the 5V power supply, the other end of the resistor R22 is connected to one end of a capacitor C39 and an OUT1 pin of the voltage comparator U5, the other end of the capacitor C39 is grounded, an INB1 pin of the voltage comparator U5 is connected to an IFB pin of the main control chip U2 and is simultaneously connected to an INA2 pin of the voltage comparator U5, the resistor R29 is connected between the OUT1 pin and the INA2 pin of the voltage comparator U5, the INB2 pin of the voltage comparator U5 is connected to the INA1 pin, and a GND pin of the voltage comparator U5 is grounded;
the INB2 pin of the voltage comparator U5 is also connected to one end of a resistor R25, one end of a resistor R30 and one end of a capacitor C4O, the other end of the resistor R30 and the other end of the capacitor C4O are grounded, the other end of the resistor R25 is connected to one end of a capacitor C33, one end of a capacitor C34 and one end of a thermistor R27, and is also connected to a 5V power supply, the other end of the capacitor C33 and the other end of the capacitor C34 are grounded, the other end of the thermistor R27 is connected to one end of a capacitor C37 and one end of a resistor R26, the other end of the capacitor C37 is grounded, the other end of the resistor R26 is connected to one end of a capacitor C35 and the TFB pin of the main control chip U2, and the other end of the capacitor C35 is grounded;
the INB1 pin of the voltage comparator U5 is also connected with one end of a capacitor C36 and one end of a resistor R28, the other end of the capacitor C36 is grounded, and the other end of the resistor R28 is connected to an inverter bridge;
the VFB pin of the main control chip U2 is connected to one end of a capacitor C38 and one end of a resistor R31, the other end of the capacitor C38 is grounded, the other end of the resistor R31 is connected to one end of a capacitor C41, one end of a resistor R32, one end of a resistor R33 and one end of a potentiometer R34, the other end of the resistor R33 is connected to the other end of the inductor L2 and one end of a capacitor C9, the other end of the capacitor C9 is connected to a second output end of the inverter bridge, and the other end of the capacitor C41, the other end of the resistor R32 and the other end of the potentiometer R34 are grounded.
2. The pure sine wave ac constant voltage stable power supply of claim 1, wherein: boost circuit (2) at least including energy storage inductance L1, boost diode D1 and energy storage capacitor C5, energy storage inductance L1's one end connect the anodal output at rectifier and filter circuit (1), energy storage inductance L1's the other end is connected at boost diode D1's positive pole, boost diode D1's negative pole is connected at energy storage capacitor C5's positive pole, energy storage capacitor C5's negative pole is connected at rectifier and filter circuit (1)'s negative pole output.
3. A pure sine wave ac constant voltage stable power supply according to claim 2, wherein: the first driving circuit (4) at least comprises a switching tube Q5 and a pulse width modulation chip U1, wherein a collector of the switching tube Q5 is connected with the anode of the boost diode D1, an emitter of the switching tube Q5 is connected with the cathode output of the rectification filter circuit (1), and a base of the switching tube Q5 is connected to the pulse width modulation chip U1 and is controlled by the pulse width modulation chip U1.
4. A pure sine wave ac constant voltage stable power supply according to claim 3, wherein: the wide modulation chip U1 controls the on/off of the switching tube Q5 in a mode of generating PWM pulses;
when the pulse width modulation chip U1 generates positive pulse, the switching tube Q5 is conducted, and the energy storage inductor L1 stores energy; when the pulse width modulation chip U1 generates negative pulse, the switching tube Q5 is switched off, the energy storage inductor L1 releases energy to charge the energy storage capacitor C5 through the boost diode D1, the energy storage inductor L1 continuously charges the energy storage capacitor C5 under the action of the high-frequency switch, and constant boost is realized through the energy storage capacitor C5.
5. The pure sine wave ac constant voltage stable power supply of claim 1, wherein: the feedback circuit (52) comprises a current sampling resistor R19 connected between the inverter bridge and the main control circuit (51).
CN202110926905.1A 2021-08-12 2021-08-12 Pure sine wave AC constant voltage stable power supply Active CN113572371B (en)

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CN101272106A (en) * 2008-05-02 2008-09-24 蔡荣林 High-frequency pure sine wave inverter
CN104270013A (en) * 2014-09-30 2015-01-07 深圳市茂润电气有限公司 Boost automatic matching circuit and power conversion device used for smart travel
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CN204179966U (en) * 2014-09-30 2015-02-25 杭州电子科技大学 The switchable sinewave inverter of output voltage
WO2018107619A1 (en) * 2016-12-15 2018-06-21 广东百事泰电子商务股份有限公司 Pfc and llc resonance-based intelligent full-bridge sine-wave voltage conversion circuit
CN109067221A (en) * 2018-10-12 2018-12-21 中山市标致电子科技有限公司 A kind of inverter circuit
CN209608558U (en) * 2019-05-17 2019-11-08 西安科技大学 A kind of single-phase sine-wave inverter device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101272106A (en) * 2008-05-02 2008-09-24 蔡荣林 High-frequency pure sine wave inverter
CN104270013A (en) * 2014-09-30 2015-01-07 深圳市茂润电气有限公司 Boost automatic matching circuit and power conversion device used for smart travel
CN204179966U (en) * 2014-09-30 2015-02-25 杭州电子科技大学 The switchable sinewave inverter of output voltage
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