CN214480295U - 1000W sine wave inverter power adapter for converting DC into AC - Google Patents

1000W sine wave inverter power adapter for converting DC into AC Download PDF

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Publication number
CN214480295U
CN214480295U CN202022390077.8U CN202022390077U CN214480295U CN 214480295 U CN214480295 U CN 214480295U CN 202022390077 U CN202022390077 U CN 202022390077U CN 214480295 U CN214480295 U CN 214480295U
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circuit
inverter
push
pull
adapter
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CN202022390077.8U
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高其玉
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Dongguan Dongsong Electronic Co ltd
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Dongguan Dongsong Electronic Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The utility model discloses a 1000W sine wave inverter power adapter for converting DC into AC, which comprises a storage battery input and filter circuit, a push-pull quasi-resonance booster circuit, a high-frequency transformer, a bridge type finishing filter circuit, a DC-AC inverter circuit, a preceding stage drive circuit, a current sampling circuit, an SPWM drive circuit and an AC voltage output sampling circuit; two ends of a primary winding of the high-frequency transformer are grounded through the push-pull quasi-resonant booster circuit; the push-pull quasi-resonance booster circuit is controlled by a front-stage driving circuit; and the secondary output end of the high-frequency transformer is connected to the inverter bridge input end of the DC-AC inverter circuit through a bridge rectifier filter circuit. The utility model has the advantages of switching frequency is high, reaches 70KHz, and the converter is small, and power MOS manages switching loss little, efficient, and is with low costs, and power MOS manages work and opens and turn-off the mode at zero current, greatly reduced the calorific capacity of switch tube.

Description

1000W sine wave inverter power adapter for converting DC into AC
Technical Field
The utility model belongs to the technical field of the power adapter, specifically be a 1000W sine wave invertion power adapter that relates to a DC changes AC.
Background
In the traditional push-pull converter, because the switching frequency is mainly limited by the switching loss of a switching tube and is generally between 30KHz and 40KHz, the size of a selected power device is large, and the converter with high efficiency and small volume is difficult to realize.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the above-mentioned problem, provide a 1000W sine wave invertion power adapter of DC commentaries on classics AC, adopted soft switching technique, this technique is accurate resonant soft switch push-pull circuit, and it is high to have switching frequency, reaches 70KHz, and the converter is small, and power MOS manages switching loss little, efficient, advantage such as with low costs.
The utility model discloses a realize through following technical scheme:
A1000W sine wave inverter power adapter for converting DC to AC is characterized in that: the device comprises a storage battery input and filter circuit, a push-pull quasi-resonant booster circuit, a high-frequency transformer, a bridge type trimming filter circuit, a DC-AC inverter circuit, a preceding stage drive circuit, a current sampling circuit, an SPWM drive circuit and an alternating voltage output sampling circuit;
the positive electrode of the storage battery input and filter circuit is connected to the middle part of the primary winding of the high-frequency transformer; two ends of a primary winding of the high-frequency transformer are grounded through the push-pull quasi-resonant booster circuit; the control signal input end of the push-pull quasi-resonance booster circuit is connected with the PWM signal output end of the preceding stage driving circuit; the secondary output end of the high-frequency transformer is connected to the inverter bridge input end of the DC-AC inverter circuit through a bridge type finishing filter circuit; the output end of an inverter bridge of the DC-AC inverter circuit is connected to the final output end through a filter circuit;
a current sampling circuit is connected between the secondary output end of the high-frequency transformer and the bridge type arrangement filter circuit; a sampling signal of the current sampling circuit is input to a current feedback input end of the preceding stage driving circuit;
the output end of an inverter bridge of the DC-AC inverter circuit is connected with an alternating voltage output sampling circuit; and a sampling signal of the alternating voltage output sampling circuit is input to a voltage feedback input end of the SPWM driving circuit.
Furthermore, the push-pull quasi-resonant booster circuit is composed of two groups of push-pull booster circuits; each group of push-pull booster circuit is formed by connecting 4 field effect tubes in parallel;
furthermore, the preceding stage driving circuit outputs two paths of push-pull mode PWM signals, and the two paths of push-pull mode PWM signals are correspondingly connected with control ends of two groups of push-pull boost circuits of the push-pull quasi-resonant boost circuit.
Further, the DC-AC inverter circuit comprises two groups of inverter bridge arms; each group of inverter bridge arms comprises a high-end field effect transistor and a low-end field effect transistor; and the control ends of each high-end field effect transistor and each low-end field effect transistor are respectively connected to the corresponding control ends of the SPWM drive circuit.
The field effect transistor is a power MOS transistor.
Furthermore, the SPWM drive circuit is internally provided with a 20MHz crystal oscillator, and an SPWM sine generator, a dead time control circuit, an amplitude factor multiplier, a soft start circuit, a protection circuit and a serial liquid crystal drive module are integrated in the SPWM drive circuit.
The utility model has the advantages that: 1. the soft switch technology is adopted, the technology is a quasi-resonant soft switch push-pull circuit, and the quasi-resonant soft switch push-pull circuit has the advantages of high switching frequency reaching 70KHz, small size of a converter, low switching loss of a power MOS tube, high efficiency, low cost and the like. 2. In each PWM period, the power MOS tube works in a Zero Current (ZCS) opening and closing mode, so that the heat productivity of the switching tube is greatly reduced. 3. The preceding stage drive circuit is specially used for driving the preceding stage push-pull quasi-resonance boosting of the inverter, under-voltage buzzing, under-voltage turn-off and battery overvoltage turn-off protection are provided, 40KHz PWM signals and overcurrent protection in two push-pull modes are output, a shallow closed loop voltage stabilization mode is adopted for voltage feedback, highest voltage limitation can be realized, the phenomenon that an MOS (metal oxide semiconductor) tube is burnt due to overhigh voltage during no-load is prevented, meanwhile, the filter inductance output by a transformer is saved, and the overall cost and the PCB space are reduced. 4. The SPWM drive circuit is an enhanced pure sine wave inverter control module, a 20MHz crystal oscillator is arranged in the SPWM drive circuit, and a pure sine wave 50Hz or 60Hz inverter with high precision, very small distortion and harmonic waves can be realized.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
In the figure, the device comprises a storage battery input and filter circuit 10, a push-pull quasi-resonant booster circuit 20, a push-pull quasi-resonant booster circuit 30, a high-frequency transformer 40, a bridge type trimming filter circuit 50, a DC-AC inverter circuit 60, a preceding stage driving circuit 70, a current sampling circuit 80, an SPWM driving circuit 90 and an alternating current voltage output sampling circuit.
Detailed Description
The invention will be further described with reference to the following specific examples and the accompanying drawings.
As shown in fig. 1-2, a 1000W sine wave inverter power adapter for converting DC to AC comprises a storage battery input and filter circuit 10, a push-pull quasi-resonant boost circuit 20, a high-frequency transformer 30, a bridge rectifier filter circuit 40, a DC-AC inverter circuit 50, a pre-driver circuit 60, a current sampling circuit 70, an SPWM driver circuit 80, and an AC voltage output sampling circuit 90;
the positive electrode of the storage battery input and filter circuit 10 is connected to the middle part of the primary winding of the high-frequency transformer 30; two ends of a primary winding of the high-frequency transformer 30 are grounded through the push-pull quasi-resonant booster circuit 20; the control signal input end of the push-pull quasi-resonant booster circuit 20 is connected with the PWM signal output end of the preceding stage driving circuit 60; the secondary output end of the high-frequency transformer 30 is connected to the inverter bridge input end of the DC-AC inverter circuit 50 through a bridge rectifier filter circuit 40; the output end of the inverter bridge of the DC-AC inverter circuit 50 is connected to the final output end through a filter circuit;
a current sampling circuit 70 is connected between the secondary output end of the high-frequency transformer 30 and the bridge rectifier filter circuit 40; the sampling signal of the current sampling circuit 70 is input to the current feedback input terminal of the preceding stage driving circuit 60;
the battery input and filter circuit 10 includes a filter capacitor C1.
The pre-driver circuit 60 outputs two paths of PWM signals in 40KHz push-pull mode, and the output ports are G2 and G1.
The push-pull quasi-resonant booster circuit 20 is composed of two groups of push-pull booster circuits. One group of push-pull boosting circuits is formed by connecting field effect transistors (power MOS transistors) V3, V4, V5 and V6 in parallel, one end of the parallel circuit is connected with one end of a primary winding of the high-frequency transformer 30, and the other end of the parallel circuit is grounded; control terminals of field effect transistors V3, V4, V5 and V6 are connected to a G2 port of the front-stage driving circuit 60 through resistors R8, R9, R10 and R11 respectively. The other group of push-pull boosting circuits is formed by connecting field effect transistors (power MOS transistors) V7, V8, V9 and V10 in parallel, one end of each parallel circuit is connected with the other end of the primary winding of the high-frequency transformer 30, and the other end of each parallel circuit is grounded; control terminals of field effect transistors V7, V8, V9 and V10 are connected to a G1 port of the front-stage driving circuit 60 through resistors R12, R13, R14 and R15 respectively.
The SPWM drive circuit 80 mainly comprises a chip EG1 and a chip U7 (the model of the chip EG1 is EG8010, the model of the chip U7 is EG2126), a 20MHz crystal oscillator is arranged in the SPWM drive circuit, and an SPWM sine generator, a dead time control circuit, an amplitude factor multiplier, a soft start circuit, a protection circuit and a serial liquid crystal drive module are integrated in the SPWM drive circuit. The port mainly has two high-end driving output ends 2HO and 1HO, two low-end driving output ends 2LO and 1LO, and a voltage feedback input end VFB.
The DC-AC inverter circuit 50 includes two sets of inverter legs; the inverter bridge arms comprise a high-end field effect transistor (power MOS transistor) V1 and a low-end field effect transistor (power MOS transistor) V12, the control end of the high-end field effect transistor V1 is connected to the high-voltage driving output end 2HO of the SPWM driving circuit 80 through a parallel circuit of a resistor R2 and a diode D4, and the control end of the low-end field effect transistor V12 is connected to the low-voltage driving output end 1LO of the SPWM driving circuit 80 through a parallel circuit of a resistor R20 and a diode D11; and the other group of inverter bridge arms consists of a high-end field effect transistor (power MOS transistor) V2 and a low-end field effect transistor (power MOS transistor) V11, the control end of the high-end field effect transistor V2 is connected to the high-voltage driving output end 1HO of the SPWM driving circuit 80 through a parallel circuit of a resistor R3 and a diode D3, and the control end of the low-end field effect transistor V11 is connected to the low-voltage driving output end 2LO of the SPWM driving circuit 80 through a parallel circuit of a resistor R19 and a diode D12.
The output end of the inverter bridge of the DC-AC inverter circuit 50 is connected with an alternating voltage output sampling circuit 90; the sampling signal of the ac voltage output sampling circuit 90 is input to the voltage feedback input terminal VFB of the SPWM driving circuit 80.
The utility model discloses a soft switching technique, this technique are accurate resonant soft switch push-pull circuit, have switching frequency height, reach 70KHz, the converter is small, and power MOS manages switching loss little, efficient, advantage such as with low costs. In each PWM period, the power MOS tube works in a Zero Current (ZCS) opening and closing mode, so that the heat productivity of the switching tube is greatly reduced.
The preceding stage drive circuit 60 is exclusively used in the drive module that the quasi-resonance of inverter preceding stage push-pull boosted, provides battery under-voltage buzzing, under-voltage turn-off and battery overvoltage turn-off protection, outputs the 40KHz PWM signal and the overcurrent protection of two way push-pull modes, and voltage feedback has adopted shallow closed loop steady voltage mode, can realize the maximum voltage restriction, prevents that voltage is too high and leads to the phenomenon of burning the MOS pipe when no load, has saved the filter inductance of transformer output simultaneously, reduces overall cost and PCB space.
The SPWM drive circuit 80 is an enhanced pure sine wave inverter control module. A20 MHz crystal oscillator is arranged in the inverter, so that a pure sine wave 50Hz or 60Hz inverter with high precision and very small distortion and harmonic waves can be realized. The module adopts a CMOS (complementary metal oxide semiconductor) process, and functions of an SPWM (sinusoidal pulse width modulation) sine generator, a dead time control circuit, an amplitude factor multiplier, a soft start circuit, a protection circuit, a serial liquid crystal driving module and the like are integrated inside the module.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and those skilled in the art should be equivalent replacement modes without departing from the spirit and principles of the present invention.

Claims (5)

1. A1000W sine wave inverter power adapter for converting DC to AC is characterized in that: the device comprises a storage battery input and filter circuit, a push-pull quasi-resonant booster circuit, a high-frequency transformer, a bridge type trimming filter circuit, a DC-AC inverter circuit, a preceding stage drive circuit, a current sampling circuit, an SPWM drive circuit and an alternating voltage output sampling circuit;
the positive electrode of the storage battery input and filter circuit is connected to the middle part of the primary winding of the high-frequency transformer; two ends of a primary winding of the high-frequency transformer are grounded through the push-pull quasi-resonant booster circuit; the control signal input end of the push-pull quasi-resonance booster circuit is connected with the PWM signal output end of the preceding stage driving circuit; the secondary output end of the high-frequency transformer is connected to the inverter bridge input end of the DC-AC inverter circuit through a bridge type finishing filter circuit; the output end of an inverter bridge of the DC-AC inverter circuit is connected to the final output end through a filter circuit;
a current sampling circuit is connected between the secondary output end of the high-frequency transformer and the bridge type arrangement filter circuit; a sampling signal of the current sampling circuit is input to a current feedback input end of the preceding stage driving circuit;
the output end of an inverter bridge of the DC-AC inverter circuit is connected with an alternating voltage output sampling circuit; and a sampling signal of the alternating voltage output sampling circuit is input to a voltage feedback input end of the SPWM driving circuit.
2. The adapter of claim 1, wherein the adapter is adapted to convert DC to AC from a 1000W sine wave inverter power supply: the push-pull quasi-resonance booster circuit consists of two groups of push-pull booster circuits; each group of push-pull booster circuit is formed by connecting 4 field effect transistors in parallel.
3. The adapter of claim 1, wherein the adapter is adapted to convert DC to AC from a 1000W sine wave inverter power supply: the front-stage driving circuit outputs two paths of PWM signals in a push-pull mode and is correspondingly connected with the control ends of two groups of push-pull boosting circuits of the push-pull quasi-resonance boosting circuit.
4. The adapter of claim 1, wherein the adapter is adapted to convert DC to AC from a 1000W sine wave inverter power supply: the DC-AC inverter circuit comprises two groups of inverter bridge arms; each group of inverter bridge arms comprises a high-end field effect transistor and a low-end field effect transistor; and the control ends of each high-end field effect transistor and each low-end field effect transistor are respectively connected to the corresponding control ends of the SPWM drive circuit.
5. The adapter of claim 1, wherein the adapter is adapted to convert DC to AC from a 1000W sine wave inverter power supply: the SPWM drive circuit is internally provided with a 20MHz crystal oscillator, and an SPWM sine generator, a dead time control circuit, an amplitude factor multiplier, a soft start circuit, a protection circuit and a serial liquid crystal drive module are integrated in the SPWM drive circuit.
CN202022390077.8U 2020-10-25 2020-10-25 1000W sine wave inverter power adapter for converting DC into AC Active CN214480295U (en)

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Application Number Priority Date Filing Date Title
CN202022390077.8U CN214480295U (en) 2020-10-25 2020-10-25 1000W sine wave inverter power adapter for converting DC into AC

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022390077.8U CN214480295U (en) 2020-10-25 2020-10-25 1000W sine wave inverter power adapter for converting DC into AC

Publications (1)

Publication Number Publication Date
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