CN115133804B - AC output switch power supply - Google Patents

AC output switch power supply Download PDF

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Publication number
CN115133804B
CN115133804B CN202211030515.7A CN202211030515A CN115133804B CN 115133804 B CN115133804 B CN 115133804B CN 202211030515 A CN202211030515 A CN 202211030515A CN 115133804 B CN115133804 B CN 115133804B
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circuit
output current
output
inductor
current circuit
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CN115133804A (en
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王齐祥
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Guangzhou Dsppa Information Technology Co ltd
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Guangzhou Dsppa Information Technology 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
    • 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
    • H02M7/539—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 with automatic control of output wave form or frequency
    • H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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

Abstract

The invention provides an alternating current output switching power supply, which comprises an inductor L1, a capacitor C2, a voltage-to-pulse width modulation circuit, a forward output current circuit, a reverse output current circuit and a load circuit, wherein the input end of the forward output current circuit and the input end of the reverse output current circuit are converged at a node A, one end of the inductor is connected with the anode of a power supply E1, and the other end of the inductor is connected with the node A; the input end of the voltage-to-pulse width modulation circuit is connected with an alternating current voltage signal AC, and the output end of the voltage-to-pulse width modulation circuit is respectively connected with the forward output current circuit and the reverse output current circuit; the output end of the forward output current circuit and the output end of the reverse output current circuit are respectively connected with the load circuit. The invention controls the positive output current circuit and the reverse output current circuit to work in turn through the voltage-to-pulse width modulation circuit so as to realize alternating current output in the load circuit; the circuit of the invention has simple structure, fewer components compared with the traditional switch power supply and convenient popularization and use.

Description

AC output switch power supply
Technical Field
The invention relates to the field of digital power amplifiers, in particular to an alternating current output switching power supply.
Background
Conventional switching power supplies are dc power supplies, and are typically characterized by having an output that is rectified and filtered to provide a unidirectional current to a load.
In order to output ac, such as fifty hz sinusoidal ac or audio voltage for driving a speaker, it is conventional practice to use a dc switching power supply in combination with an ac power amplifier. Although the technical research has realized that the switching power supply directly outputs alternating current, the switching power supply has too many electronic components and is not inferior to the direct current switching power supply with a power amplifier in complexity and cost, so the switching power supply is not popularized and applied.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an alternating current output switching power supply.
The technical scheme of the invention is realized as follows:
a switching power supply for alternating current output comprises an inductor L1, a capacitor C2, a voltage-to-pulse width modulation circuit, a forward output current circuit, a reverse output current circuit and a load circuit, wherein the input end of the forward output current circuit and the input end of the reverse output current circuit are gathered at a node A, one end of the inductor is connected with the anode of a power supply E1, and the other end of the inductor is connected with the node A; the input end of the voltage-to-pulse width modulation circuit is connected with an alternating voltage signal AC, and the output end of the voltage-to-pulse width modulation circuit is respectively connected with the forward output current circuit and the reverse output current circuit so as to control the forward output current circuit and the reverse output current circuit to be conducted in turn; the output end of the forward output current circuit and the output end of the reverse output current circuit are respectively connected with the load circuit; one end of the capacitor C2 is connected with the input end of the load circuit, and the other end of the capacitor C2 is grounded; the forward output current circuit and the reverse output current circuit are controlled to be conducted in turn through the voltage-to-pulse width modulation circuit so as to form alternating current output on the load circuit.
Furthermore, the positive output current circuit comprises an MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the output end of the voltage-to-pulse width modulation circuit, the drain electrode D of the MOS tube Q1 is connected with the inductor, and the source electrode S of the MOS tube Q1 is grounded.
Furthermore, the reverse output current circuit comprises an MOS tube Q2, a phase inverter F1 and a level shift circuit, wherein the input end of the phase inverter F1 is connected with the output end of the voltage-to-pulse width modulation circuit, the output end of the phase inverter F1 is connected with the input end of the level shift circuit, the output end of the level shift circuit is connected with a grid G of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with an inductor, and the drain electrode D of the MOS tube Q2 is connected with a load circuit.
The circuit further comprises a negative feedback circuit, wherein the negative feedback circuit comprises a comparator U1, a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are gathered at a node C, one end of the resistor R2 is connected with a load circuit, and the other end of the resistor R2 is connected with a first input end of the comparator U1; one end of the resistor R3 is connected with the first input end of the comparator U1, and the other end of the resistor R is grounded; the alternating voltage signal AC is connected to the second input terminal of the comparator U1, and the output terminal of the comparator U1 is connected to the voltage-to-pulse width modulation circuit.
Furthermore, the reverse output current circuit comprises an MOS (metal oxide semiconductor) tube Q2, a phase inverter F1 and an inductor L3, wherein the input end of the phase inverter F1 is connected with the output end of the voltage-to-pulse width modulation circuit, the output end of the phase inverter F1 is connected with a grid G circuit of the MOS tube Q2, and the source s of the MOS tube Q2 is grounded; the drain D of the MOS tube Q2 is connected with one end of an inductor L3, and the other end of the inductor L3 is connected with a load circuit; wherein, the inductor L3 is coupled to one side of the inductor L1 such that the inductor L1 and the inductor L3 form a flyback transformer T1.
Furthermore, the load circuit comprises a capacitor C1 and a load resistor RL, one end of the capacitor C1 and one end of the capacitor C2 are collected at a node D, the forward output current circuit and the reverse output current circuit are respectively connected with the node D, and the other end of the capacitor C1 is connected with the load resistor RL.
Further, the flyback converter circuit is arranged in a mirror image mode with the flyback transformer T1 and comprises a capacitor C2, an MOS (metal oxide semiconductor) tube Q3, an MOS tube Q4 and a transformer T2, the output end of the phase inverter F1 is connected with a grid G of the MOS tube Q3, and the input end of the phase inverter F1 is connected with a grid G of the MOS tube Q4; the primary side of the transformer T2 is connected between the positive electrode of the power supply E1 and the drain electrode D of the MOS tube Q3, and the drain electrode D of the MOS tube Q4 is connected with one end of the secondary side of the transformer T2;
the load circuit comprises a load resistor RL, one end of the load resistor RL is connected with one end of the L3 of the transformer T1, and the other end of the load resistor RL is connected with one end of the L5 of the transformer T2.
Compared with the prior art, the invention has the following advantages: the invention adds a voltage-to-pulse width modulation circuit, a forward output current circuit and a reverse output current circuit in the switch power supply, controls the forward output current circuit and the reverse output current circuit to work in turn through the voltage-to-pulse width modulation circuit, and realizes alternating current output in a load circuit through pulse width modulation, thereby being capable of being used as various alternating current power supplies and audio power amplifiers and being used for energy recovery of new energy vehicles. The circuit of the invention has simple structure, fewer components compared with the traditional switch power supply and convenient popularization and use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of an AC output switching power supply according to the present invention;
FIG. 2 is a circuit diagram of an embodiment of an AC output switching power supply according to the present invention;
FIG. 3 is a circuit configuration diagram of the embodiment of FIG. 2 after negative feedback is introduced;
FIG. 4 is a circuit diagram of an alternate embodiment of the AC output switching power supply of the present invention;
FIG. 5 is a circuit diagram of an AC output switching power supply according to another embodiment of the present invention;
fig. 6 is a circuit configuration diagram of the embodiment of fig. 4 after negative feedback is introduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of a switching power supply for ac output according to the present invention, and an embodiment of the present invention discloses a switching power supply for ac output, including an inductor L1, a capacitor C2, a voltage-to-pulse width modulation circuit, a forward output current circuit, a reverse output current circuit, and a load circuit, where an input end of the forward output current circuit and an input end of the reverse output current circuit are collected at a node a, one end of the inductor is connected to an anode of a power supply E1, and the other end of the inductor is connected to the node a; the input end of the voltage-to-pulse width modulation circuit is connected with an alternating current voltage signal AC, and the output end of the voltage-to-pulse width modulation circuit is respectively connected with the forward output current circuit and the reverse output current circuit so as to control the forward output current circuit and the reverse output current circuit to be conducted in turn; the output end of the forward output current circuit and the output end of the reverse output current circuit are respectively connected with the load circuit; one end of the capacitor C2 is connected with the input end of the load circuit, and the other end of the capacitor C2 is grounded; the forward output current circuit and the reverse output current circuit are controlled to be conducted in turn through the voltage-to-pulse width modulation circuit so as to form alternating current output on the load circuit.
In the embodiment of the invention, the forward output current circuit and the reverse output current circuit are controlled to work in turn by the voltage-to-pulse width modulation circuit, and alternating current output is realized in the load circuit by pulse width modulation, so that the power amplifier can be used as various alternating current power supplies and audio power amplifiers.
Specifically, as shown in fig. 2, the positive output current circuit includes a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to an output terminal of the voltage-to-pulse width modulation circuit, a drain D of the MOS transistor Q1 is connected to the inductor, and a source S of the MOS transistor Q1 is grounded.
Specifically, as shown in fig. 2, the positive output current circuit includes a MOS transistor Q2, a phase inverter F1 and a level shift circuit, an input terminal of the phase inverter F1 is connected to an output terminal of the voltage-to-pulse width modulation circuit, an output terminal of the phase inverter F1 is connected to an input terminal of the level shift circuit, an output terminal of the level shift circuit is connected to a gate G of the MOS transistor Q2, a source of the MOS transistor Q2 is connected to an inductor L1, and a drain D of the MOS transistor Q2 is connected to the load circuit.
In this embodiment, as shown in fig. 2, an AC voltage signal AC is input, and is converted into a PWM pulse width modulation signal by a voltage-to-pulse width modulation circuit to control the on/off of an MOS transistor Q1 in a forward output current circuit; in the other path, namely in the forward output current circuit, a PWM (pulse width modulation) signal controls the on and off of a MOS (metal oxide semiconductor) transistor Q2 after passing through an inverter F1 and a level shift circuit, so that the Q1 and the Q2 are alternately switched on and off to form alternating current output on a capacitor C1, thereby driving a load to work.
Specifically, when the MOS transistor Q1 is turned on and the MOS transistor Q2 is turned off, forward current can be realized by the inductor L1 and the MOS transistor Q1; when the MOS tube Q1 is closed and the MOS tube Q2 is conducted, the inductor L1, the MOS tube Q2 and the output circuit can form a reverse output current circuit; the MOS tube Q1 and the MOS tube Q2 are controlled to work in turn through PWM pulse width modulation signal circulation, so that the alternating occurrence of forward current and reverse current is realized, and further alternating current output is formed on the capacitor C1 to drive a load to work.
As shown in fig. 3, the ac output switching power supply of the present invention further includes a negative feedback circuit, where the negative feedback circuit includes a comparator U1, a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are collected at a node C, one end of the resistor R2 is connected to the load circuit, and the other end of the resistor R2 is connected to the first input end of the comparator U1; one end of the resistor R3 is connected with the second input end of the comparator U1, and the other end of the resistor R is grounded; the alternating voltage signal AC is connected with a second input end of the comparator U1, and an output end of the comparator U1 is connected with the voltage-to-pulse width modulation circuit.
In this embodiment, the negative feedback circuit collects the voltage signal in the load circuit in real time, and then compares the voltage signal with the reference voltage, so as to adjust the output of the PWM signal in the voltage-to-pulse width modulation circuit, thereby ensuring the normal operation of the load circuit.
In practical application, considering that a floating power supply circuit is needed when the MOS transistor Q2 in fig. 2 is driven, and a level shift circuit must be added to drive the G pole in the MOS transistor Q2 to be turned on, in this embodiment, as shown in fig. 4, the MOS transistor Q2 in fig. 4 can directly turn on the G pole, so that the floating power supply circuit is not needed for driving; however, the two circuits of the floating power supply circuit and the level shift circuit have complicated structures and many related components, which results in high cost of the switching power supply. On the basis, the embodiment of the invention improves the circuit of the switching power supply, in particular to the circuit structure of the reverse output current circuit.
Specifically, in another embodiment of the present invention, as shown in fig. 4, the reverse output current circuit includes a MOS transistor Q2, a phase inverter F1 and an inductor L3, an input end of the phase inverter F1 is connected to an output end of the voltage-to-pulse-width modulation circuit, an output end of the phase inverter F1 is connected to a gate G circuit of the MOS transistor Q2, and a source s of the MOS transistor Q2 is grounded; the drain D of the MOS tube Q2 is connected with one end of an inductor L3, and the other end of the inductor L3 is connected with a load circuit; wherein, the inductor L3 is coupled to one side of the inductor L1 such that the inductor L1 and the inductor L3 form a flyback transformer T1.
In the embodiment, a secondary winding coil L3 is added on an inductor L1, then a drain D of an MOS tube Q2 is connected with the L3, and a source S of the MOS tube Q2 is grounded; MOS pipe Q2 comes through inductance L3 with preceding L1's signal coupling, and the centre is kept apart through transformer T1, need not the lug connection, and reasonable design transformer turn ratio can save suspension power supply and level shift circuit to greatly simplified switching power supply's circuit structure, compared in current switching power supply and figure 2, reduced many components and parts by a wide margin, thereby greatly reduced switching power supply's cost, be convenient for use widely on the market. In this embodiment, the inductor L1 and the inductor L3 form a flyback transformer, and the voltage-to-pulse-width modulation circuit controls the MOS transistor Q1 and the MOS transistor Q2 to be turned on in turn, so that an ac output is formed on the capacitor C1 to drive a load to operate.
When introducing a load on the basis of fig. 4, see fig. 6. In fig. 6, an isolator electrical isolator B is also added. Therefore, the circuit of the embodiment has good practicability, is convenient to design and directly uses the flyback alternating current amplifying circuit with the isolation function in the mains supply, and is favorable for popularization and application.
In an embodiment of the present invention, the load circuit includes a capacitor C1 and a load resistor RL, one end of the capacitor C1 and one end of the capacitor C2 are collected at a node D, the forward output current circuit and the reverse output current circuit are respectively connected to the node D, and the other end of the capacitor C1 is connected to the load resistor RL. In the embodiment, because the output direct current voltage can damage loads such as a loudspeaker and the like, the capacitor C1 is added to cut off the direct current voltage from being added to the loads to avoid damaging the loads, and the capacitor has the function of alternating current and direct current cutting off, so that the capacitor C1 is introduced to cut off the direct current, and the alternating current output is formed on the load resistor RL.
In another embodiment of the present invention, the ac output may be formed at the load resistor RL by another method. Specifically, as shown in fig. 5, on the basis of the above embodiment, a flyback transformer circuit arranged in a mirror image with the flyback transformer T1 is introduced in the embodiment of the present invention, where the flyback transformer circuit includes a capacitor C2, an MOS transistor Q3, an MOS transistor Q4, and a transformer T2, an output end of a phase inverter F1 is connected to a gate G of the MOS transistor Q3, and an input end of an inverted phase F1 is connected to a gate G of the MOS transistor Q4; the primary side of the transformer T2 is connected between the positive electrode of the power supply E1 and the drain electrode D of the MOS tube Q3, and the drain electrode D of the MOS tube Q4 is connected with one end of the secondary side of the transformer T2;
and the load circuit comprises a load resistor RL, one end of the load resistor RL is connected with one end of the L3 of the transformer T1, and the other end of the load resistor RL is connected with one end of the L5 of the transformer T2.
In this embodiment, as shown in fig. 5, there are two output terminals, wherein the circuit formed by Q1, Q2, L1, L3, and C1 outputs the first half-period signal, and the circuit formed by Q3, Q4, L5, and C2 outputs the second half-period signal, these two output terminals are applied to two ends of the load to form a complete-period output, and the complete-period signal output has no dc voltage, so the dc blocking capacitor C1 in fig. 4 is eliminated.
In summary, the invention adds the voltage-to-pulse width modulation circuit, the forward output current circuit and the reverse output current circuit in the switching power supply, controls the forward output current circuit and the reverse output current circuit to work in turn through the voltage-to-pulse width modulation circuit, and realizes alternating current output in the load circuit through pulse width modulation, thereby being capable of being used as various alternating current power supplies and audio power amplifiers. The circuit of the invention has simple structure, fewer components compared with the traditional switch power supply and convenient popularization and use.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (5)

1. A switching power supply for alternating current output is characterized by comprising an inductor L1, a capacitor C2, a voltage-to-pulse width modulation circuit, a forward output current circuit, a reverse output current circuit and a load circuit, wherein the input end of the forward output current circuit and the input end of the reverse output current circuit are gathered at a node A, one end of the inductor L1 is connected with the anode of a power supply E1, and the other end of the inductor L1 is connected with the node A; the input end of the voltage-to-pulse width modulation circuit is connected with an alternating current voltage signal AC, and the output end of the voltage-to-pulse width modulation circuit is respectively connected with the forward output current circuit and the reverse output current circuit so as to control the forward output current circuit and the reverse output current circuit to be conducted in turn; the output end of the forward output current circuit and the output end of the reverse output current circuit are respectively connected with the load circuit; one end of the capacitor C2 is connected with the input end of the load circuit, and the other end of the capacitor C2 is grounded; the forward output current circuit and the reverse output current circuit are controlled to be conducted in turn through the voltage-to-pulse width modulation circuit so as to form alternating current output on the load circuit;
the positive output current circuit comprises an MOS (metal oxide semiconductor) tube Q1, a grid G of the MOS tube Q1 is connected with the output end of the voltage-to-pulse width modulation circuit, a drain D of the MOS tube Q1 is connected with an inductor L1, and a source S of the MOS tube Q1 is grounded;
the reverse output current circuit comprises an MOS (metal oxide semiconductor) tube Q2, a phase inverter F1 and a level shift circuit, wherein the input end of the phase inverter F1 is connected with the output end of the voltage-to-pulse width modulation circuit, the output end of the phase inverter F1 is connected with the input end of the level shift circuit, the output end of the level shift circuit is connected with a grid G of the MOS tube Q2, a source S of the MOS tube Q2 is connected with an inductor L1, and a drain D of the MOS tube Q2 is connected with a load circuit;
the alternating current voltage signal AC is converted into a PWM (pulse width modulation) signal through the voltage-to-pulse width modulation circuit to control the on and off of an MOS (metal oxide semiconductor) transistor Q1 in the positive output current circuit; in the reverse output current circuit, the PWM pulse width modulation signal controls the on and off of the MOS tube Q2 after passing through the phase inverter F1 and the level shift circuit, so that the MOS tube Q1 and the MOS tube Q2 are alternately switched on and off, and alternating current output is formed on the capacitor C2, thereby driving the load circuit to work.
2. An alternating current output switching power supply according to claim 1, further comprising a negative feedback circuit, wherein the negative feedback circuit comprises a comparator U1, a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are gathered at a node C, one end of the resistor R2 is connected to the load circuit, and the other end of the resistor R2 is connected to the first input end of the comparator U1; one end of the resistor R3 is connected with the first input end of the comparator U1, and the other end of the resistor R is grounded; the alternating voltage signal AC is connected with a second input end of the comparator U1, and an output end of the comparator U1 is connected with the voltage-to-pulse width modulation circuit.
3. The ac output switching power supply according to claim 1, wherein the reverse output current circuit further comprises an inductor L3, an input terminal of an inverter F1 is connected to an output terminal of the voltage-to-pulse width modulation circuit, an output terminal of the inverter F1 is connected to a gate G of a MOS transistor Q2, and a source S of the MOS transistor Q2 is grounded; the drain D of the MOS tube Q2 is connected with one end of an inductor L3, and the other end of the inductor L3 is connected with a load circuit; wherein, the inductor L3 is coupled to one side of the inductor L1 such that the inductor L1 and the inductor L3 form a flyback transformer T1.
4. An ac output switching power supply according to claim 1, wherein the load circuit includes a capacitor C1 and a load resistor RL, one end of the capacitor C1 and one end of the capacitor C2 are collected at a node D, the forward output current circuit and the reverse output current circuit are respectively connected to the node D, and the other end of the capacitor C1 is connected to the load resistor RL.
5. The AC output switching power supply according to claim 3, further comprising a flyback transformer circuit arranged in a mirror image with said flyback transformer T1, said flyback transformer circuit comprising a MOS transistor Q3, a MOS transistor Q4 and a transformer T2, wherein the output terminal of the inverter F1 is connected to the gate G of the MOS transistor Q3, and the input terminal of the inverter F1 is connected to the gate G of the MOS transistor Q4; the primary winding of the transformer T2 is connected between the positive electrode of the power supply E1 and the drain electrode D of the MOS tube Q3, and the drain electrode D of the MOS tube Q4 is connected with one end of the secondary winding of the transformer T2;
the load circuit includes a load resistor RL having one end connected to one end of the L3 of the transformer T1 and the other end connected to the other end of the secondary winding of the transformer T2.
CN202211030515.7A 2022-08-26 2022-08-26 AC output switch power supply Active CN115133804B (en)

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Citations (4)

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