CN111464060B - Linear alternating current power supply conversion device and control method thereof - Google Patents
Linear alternating current power supply conversion device and control method thereof Download PDFInfo
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- CN111464060B CN111464060B CN202010378287.7A CN202010378287A CN111464060B CN 111464060 B CN111464060 B CN 111464060B CN 202010378287 A CN202010378287 A CN 202010378287A CN 111464060 B CN111464060 B CN 111464060B
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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
- H02M7/538—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 push-pull configuration
- H02M7/53803—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 push-pull configuration with automatic control of output voltage or current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a linear alternating current power supply conversion device and a control method thereof. The signal amplifying unit amplifies the signal output by the signal filtering unit through a transformer T1 and transmits the signal into the power isolation amplifying unit, and the power isolation amplifying unit amplifies the input power through a MOS tube V1 and a MOS tube V2 and performs power isolation conversion through a transformer T2. On one hand, the closed-loop control of the output voltage is realized, and on the other hand, the linear alternating-current power supply conversion device has good electromagnetic compatibility.
Description
Technical Field
The invention relates to the technical field of inverter power supply, in particular to a linear alternating current power supply conversion device and a control method thereof.
Background
In the field of power supply applications, DC/AC power conversion technology is mainly used to convert DC power into AC power of a certain frequency for powering devices. DC/AC mainly has two conversion modes, one is based on the early linear conversion technology of low-frequency semiconductor devices, and usually adopts control modes such as resonance to generate sine wave signals, and the sine wave signals are converted into alternating voltage signals after power amplification. The SPWM (sine wave pulse width modulation) switching conversion technology based on high-frequency semiconductor devices has the characteristics of high response speed, small volume and high power density. But the disadvantage is that the electromagnetic compatibility is poor, and the application occasion with higher requirement on electromagnetic environment cannot be satisfied. In contrast, the linear conversion ac power supply based on the low frequency semiconductor device has a wider application range.
However, most of the linear alternating-current power supplies based on the resonance control mode have no closed-loop control and do not have good consistency.
Disclosure of Invention
The present invention is directed to a linear ac power converter and a control method thereof, so as to solve the above technical problems.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a linear alternating current power supply conversion device, which comprises an AC/DC feedback signal rectification unit, a signal conditioning unit, a square wave conversion unit, a signal filtering unit, a signal amplification unit and a power isolation amplification unit which are connected in sequence; the device also comprises a reference direct current signal sending unit and a frequency signal unit, wherein the reference direct current signal sending unit outputs a reference direct current signal to the signal conditioning unit; the frequency signal unit outputs a first square wave signal to a second input end of the square wave conversion unit; the power isolation amplifying unit is connected with a power supply input voltage, a first output end of the power isolation amplifying unit outputs a power supply output voltage, and a second output end of the power isolation amplifying unit outputs an alternating current feedback signal to the AC/DC feedback signal rectifying unit;
the power isolation amplifying unit comprises a first MOS tube, a second MOS tube and a second transformer; one end of a primary winding of the first transformer is used as the input end of the signal amplification unit, and the other end of the primary winding of the first transformer is grounded; the grid electrode of the first MOS tube is connected with one end of a first secondary winding of the first transformer, and the grid electrode of the second MOS tube is connected with one end of a second secondary winding of the first transformer; the source electrode of the first MOS tube is connected with one end of a first primary winding of the second transformer, and the source electrode of the second MOS tube is connected with one end of a second primary winding of the second transformer; the drain electrode of the first MOS tube and the drain electrode of the second MOS tube are connected with an input voltage VIN; the other end of the first secondary winding of the first transformer and the other end of the second secondary winding of the first transformer are grounded; the other end of the first primary winding of the second transformer and the other end of the second primary winding of the second transformer are grounded; two ends of the first secondary winding of the second transformer are used as second output ends of the power isolation amplifying unit, and two ends of the second secondary winding of the second transformer are used as first output ends of the power isolation amplifying unit.
Furthermore, the signal conditioning unit comprises a first operational amplifier, a first resistor, a second resistor and a first capacitor; one end of the first resistor is used as the input end of the signal conditioning unit, the other end of the first resistor is connected with the reverse input end of the first operational amplifier, a reference direct current signal is input to the non-inverting input end of the first operational amplifier, the second resistor is connected between the reverse input end and the output end of the first operational amplifier after being connected with the first capacitor in series, and the output end of the first operational amplifier is used as the output end of the signal conditioning unit.
Further, the square wave conversion unit comprises a second operational amplifier, a third resistor and a third MOS tube; the non-inverting input end of the second operational amplifier is used as the input end of the square wave conversion unit, and the output end of the second operational amplifier is connected with the inverting input end; the grid electrode of the third MOS tube receives a first square wave signal, the source electrode of the third MOS tube is grounded, and the output end of the second operational amplifier is sequentially connected with the third resistor and the drain electrode of the third MOS tube and then serves as the output end of the square wave conversion unit.
Furthermore, the reference direct current signal sending unit comprises a fourth resistor and a voltage stabilizing diode, wherein a reference voltage is input to one end of the fourth resistor, the fourth resistor is connected with the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is grounded; the sampling end of the voltage stabilizing diode is connected with the cathode and is used as the output end of the reference direct current signal sending unit.
Further, the AC/DC feedback signal rectification unit comprises a full-bridge rectification circuit, an LC filter circuit and an amplifying circuit; the alternating current feedback signal is rectified by the full-bridge rectifying circuit, filtered by the LC filter circuit, amplified by the amplifying circuit and output to the signal conditioning unit.
Further, the frequency signal unit is a square wave generator or a digital processor.
Further, the signal filtering unit is a band-pass filter or a low-pass filter.
In a second aspect, the present invention provides a method for controlling a linear ac power converter, including the steps of:
step S1, the AC/DC feedback signal rectification unit collects the AC feedback signal output by the power isolation amplification unit, and outputs a DC feedback signal after rectification and amplification;
step S2, the signal conditioning unit receives the direct current feedback signal, adjusts the amplitude of the direct current feedback signal, and outputs the direct current level with adjustable amplitude;
step S3, the square wave conversion unit converts the amplitude-adjustable direct current level into a second square wave signal with controllable amplitude;
step S4, the signal filtering unit filters the second square wave signal and outputs a sine wave signal;
step S5, the signal amplification unit amplifies the sine wave signal and converts the sine wave signal into an alternating current signal of common ground push-pull;
and step S6, the power isolation amplifying unit converts the alternating current signal into two paths of output, the first path of output power supply output voltage supplies power for a post-stage circuit or module, and the second path of output alternating current feedback signal is sent to the AC/DC feedback signal rectifying unit.
Further, the step S1 specifically includes: the AC feedback signal is rectified by the full-bridge rectification circuit, filtered by the LC filter circuit, amplified by the amplifier circuit and then output as the DC feedback signal.
Further, the filtering manner in step S4 is band-pass filtering or low-pass filtering.
The invention has the beneficial effects that: the signal amplifying unit amplifies the signal output by the signal filtering unit through a transformer T1 and transmits the signal into the power isolation amplifying unit, and the power isolation amplifying unit amplifies input power through a MOS tube V1 and a MOS tube V2 and converts the input power into output alternating current and feedback signals through a transformer T2. The feedback signal is output to an AC/DC feedback signal rectifying unit, and the output alternating current is used for supplying power to a post-stage circuit. On one hand, closed-loop control of the output voltage is realized, and on the other hand, due to the power isolation transformer T2, the linear alternating-current power supply conversion device has good electromagnetic compatibility.
Drawings
Fig. 1 is a circuit block diagram of a linear ac power converter of the present invention;
FIG. 2 is a circuit diagram of the AC/DC feedback signal rectifying unit of the present invention;
FIG. 3 is a circuit diagram of a signal conditioning unit and a square wave transformation unit of the present invention;
FIG. 4 is a circuit diagram of a signal filtering unit of the present invention employing a band pass filter;
FIG. 5 is a circuit diagram of a signal filtering unit of the present invention employing a low pass filter;
FIG. 6 is a circuit diagram of a signal amplification unit and a power isolation amplification unit of the present invention;
fig. 7 is a circuit diagram of a reference dc signal sending unit according to the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
The circuit block diagram of the linear alternating current power supply conversion device is shown in fig. 1 and comprises a reference direct current signal sending unit, an AC/DC feedback signal rectification unit, a signal conditioning unit, a square wave conversion unit, a frequency signal unit, a signal filtering unit, a signal amplification unit and a power isolation amplification unit. The AC/DC feedback signal rectifying unit has an input terminal and an output terminal. The signal conditioning unit has a first input terminal, a second input terminal, and an output terminal. The square wave transformation unit is provided with a first input end, a second input end and an output end. The signal filtering unit has an input terminal and an output terminal. The signal amplification unit has an input terminal and an output terminal. The power isolation amplifying unit is provided with a first input end, a second input end, a first output end and a second output end.
The reference direct current signal sending unit outputs a reference direct current signal to a first input end of the signal conditioning unit. The input end of the AC/DC feedback signal rectifying unit is connected with the second output end of the power isolation amplifying unit, and an alternating current feedback signal output by the second output end of the power isolation amplifying unit is sampled; the output end of the AC/DC feedback signal rectifying unit is connected with the second input end of the signal conditioning unit. The output end of the signal conditioning unit is connected with the first input end of the square wave conversion unit. The frequency signal unit outputs a square wave signal to the second input terminal of the square wave transformation unit. The output end of the square wave conversion unit is connected to the second input end of the power isolation amplification unit after sequentially passing through the input end and the output end of the signal filtering unit and the input end and the output end of the signal amplification unit. The first input end of the power isolation amplifying unit is connected with a power supply input voltage. The first output end of the power isolation amplifying unit outputs power supply output voltage to supply power for a post-stage circuit or equipment.
Further, in an embodiment provided by the present application, the reference dc signal issuing unit is configured to issue a reference dc signal VREF to the signal conditioning unit. The reference dc signal is used as a reference set value for closed-loop control of the power conversion apparatus of the present invention, and a specific circuit thereof is shown in fig. 7, and includes a resistor R4, a zener diode U6, and a reference voltage, where the reference voltage is +5V in this embodiment. The reference voltage is input to one end of a resistor R4, the resistor R4 is connected with the cathode of a voltage stabilizing diode U6, and the anode of the voltage stabilizing diode U6 is grounded. The sampling end of the zener diode U6 is connected to the cathode of the zener diode U6 and serves as the output end of the reference dc signal sending unit to output the reference dc signal VREF.
Further, in an embodiment provided by the present application, the AC/DC feedback signal rectifying unit is configured to rectify an input AC feedback signal into a DC feedback signal and output the DC feedback signal to the signal conditioning unit. The specific circuit is shown in fig. 2, and comprises a full-bridge rectification circuit consisting of a diode D1, a diode D2, a diode D3 and a diode D4, an LC filter circuit consisting of an inductor L2 and a capacitor C2, and an amplification circuit consisting of a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier U2A. The alternating current feedback signal is rectified by the full-bridge rectifying circuit, filtered by the LC filter circuit, amplified by the amplifying circuit and then output to the signal conditioning unit as the direct current feedback signal VS. The full-bridge rectification circuit, the LC filter circuit and the amplifying circuit are all common circuits in the prior art, and the respective connection relationship and working principle are not repeated herein.
Further, in an embodiment provided by the present application, the signal conditioning unit is configured to receive a reference dc signal and a dc feedback signal, perform linear control on the reference dc signal and the dc feedback signal, and output a dc level with an adjustable amplitude. The specific circuit is shown in fig. 3, and includes an operational amplifier U1A, a resistor R1, a resistor R2, and a capacitor C1. The dc feedback signal VS is transmitted to the inverting input terminal of the operational amplifier U1A through the resistor R1, the reference dc signal VREF is input to the non-inverting input terminal of the operational amplifier U1A, and the resistor R2 is connected in series with the capacitor C1 and then connected between the inverting input terminal and the output terminal of the operational amplifier U1A. The output end of the operational amplifier U1A outputs a DC level with adjustable amplitude to the square wave conversion unit. The signal conditioning unit adopts a typical PI (proportional integral) regulation mode to achieve the purpose that the direct current feedback signal follows the reference direct current signal.
Further, in an embodiment provided by the present application, the frequency signal unit is used for emitting a square wave signal to the square wave conversion unit. The frequency signal unit is used as a square wave signal generating device and outputs square wave signals with adjustable frequency and pulse width. A square wave generator may be used to generate a square wave signal of fixed frequency and fixed pulse width. A digital processor may also be employed to generate an SPWM square wave signal of fixed frequency and varying pulse width.
Further, in an embodiment provided by the present application, the square wave transforming unit is configured to transform the dc level with adjustable amplitude and the first square wave signal into a second square wave signal with controllable amplitude. The specific circuit is shown in fig. 3, and includes an operational amplifier U1B, a resistor R3, and a MOS transistor V3. The non-inverting input end of the operational amplifier U1B receives the amplitude-adjustable direct current level output by the signal conditioning unit, and the output end of the operational amplifier U1B is connected with the inverting input end thereof. The gate of the MOS transistor V3 receives the square wave signal PWM1 sent by the frequency signal unit, the source of the MOS transistor V3 is grounded, and the output end of the operational amplifier U1B is connected with the resistor R3 and the drain of the MOS transistor V3 in sequence, and outputs the second square wave signal with controllable amplitude as the output end of the square wave conversion unit.
Further, in an embodiment provided by the present application, the signal filtering unit is configured to filter the second square wave signal and output a sine wave signal. The signal filtering unit may adopt a band-pass filter, which is a second-order active band-pass filter, and its specific circuit is shown in fig. 4. A low-pass filter, which is a second-order passive filter, may also be used, and its specific circuit is shown in fig. 5.
The signal filtering unit using the band pass filter includes a resistor R9, a resistor R10, a resistor R11, an operational amplifier U9A, a capacitor C3, and a capacitor C4. One end of the resistor R9 is used as an input end of the signal filtering unit, the resistor R9 is connected with the capacitor C4 in series and then is connected with the reverse input end of the amplifier U9A, and a node between the resistor R9 and the capacitor C4 is grounded through a resistor R11. One end of the capacitor C3 is connected with the series node of the resistor R9 and the capacitor C4, and the other end of the capacitor C3 is connected with the output end of the operational amplifier U9A. The resistor R10 is connected between the inverting input terminal and the output terminal of the operational amplifier U9A, the non-inverting input terminal of the amplifier U9A is grounded, and the output terminal of the amplifier U9A outputs a sine wave signal.
The signal filtering unit adopting the low-pass filter comprises an inductor L3 and a capacitor C5, one end of the inductor L3 serves as an input end of the signal filtering unit, and the other end of the inductor L3 is connected with one end of the capacitor C5 and serves as an output end of the signal filtering unit to output a sine wave signal. The other terminal of the capacitor C5 is connected to ground.
Further, in an embodiment provided by the present application, the signal amplifying unit functions to: the sine wave signal output by the signal filtering unit is amplified by a transformer T1 and converted into a common ground push-pull alternating current signal so as to drive the rear-stage power isolation amplifying unit. The specific circuit diagram is shown in fig. 6, and includes a transformer T1. One end of the primary winding of the transformer T1 serves as an input end of the signal amplification unit. The other end of the primary winding of the transformer T1 is grounded. One end of the first secondary winding and one end of the second secondary winding of the transformer T1 serve as output ends of the signal amplifying unit.
Further, in an embodiment provided by the present application, the power isolation amplifying unit is configured to convert the AC signal output by the signal amplifying unit into two paths of output according to a transformation ratio, where the first path of output power supply output voltage supplies power to a subsequent circuit or module, and the second path of output power supply output voltage outputs an AC feedback signal to the AC/DC feedback signal rectifying unit. The specific circuit diagram is shown in fig. 6, and includes a MOS transistor V1, a MOS transistor V2, and a transformer T2. The drain of MOS transistor V1 and the drain of MOS transistor V2 are connected to both ends of the power supply input voltage. The gate of the MOS transistor V1 and the gate of the MOS transistor V2 are connected to one end of the first secondary winding and one end of the second secondary winding of the transformer T1, respectively. The source of MOS transistor V1 is connected to one end of the first primary winding of transformer T2, and the source of MOS transistor V2 is connected to one end of the second primary winding of transformer T2. The other end of the first secondary winding of the transformer T1 is connected with the other end of the second secondary winding of the transformer T1 and is used as a secondary winding center tap of the transformer T1; the other end of the first primary winding of the transformer T2 is connected to the other end of the second primary winding of the transformer T2 and is tapped as the primary winding center of the transformer T2. The center tap of the secondary winding of the transformer T1 and the center tap of the primary winding of the transformer T2 are grounded. Both ends of the first secondary winding of the transformer T2 output an AC feedback signal to the AC/DC feedback signal rectifying unit. And the two ends of the second secondary winding of the transformer T2 output power supply output voltage to supply power for a post-stage circuit or module.
The invention has the beneficial effects that the signal amplification unit and the power isolation amplification unit are used for realizing the purpose. The signal amplification unit amplifies the sine wave signal output by the signal filtering unit through a transformer T1 and transmits the sine wave signal into the power isolation amplification unit, and the power isolation amplification unit amplifies input power input by power supply through a MOS tube V1 and a MOS tube V2 and converts the input power into power supply output voltage and an alternating current feedback signal through a transformer T2. The ac feedback signal enables closed loop control of the output voltage. Because the power supply output voltage and the alternating current feedback signal are mutually isolated, the linear alternating current power supply conversion device has good electromagnetic compatibility.
A control method of a linear alternating current power supply conversion device comprises the following steps:
and step S1, the AC/DC feedback signal rectification unit collects the AC feedback signal output by the power isolation amplification unit, and outputs a DC feedback signal after rectification and amplification.
The AC/DC feedback signal rectification unit comprises a full-bridge rectification circuit, an LC filter circuit and an amplifying circuit, wherein an alternating current feedback signal is rectified by the full-bridge rectification circuit, filtered by the LC filter circuit and amplified by the amplifying circuit to output a direct current feedback signal.
And step S2, the signal conditioning unit receives the direct current feedback signal, adjusts the amplitude of the direct current feedback signal and outputs the direct current level with adjustable amplitude.
The signal conditioning unit adjusts the amplitude of the DC feedback signal according to a reference DC signal. The reference direct current signal is generated by a reference direct current signal emitting unit.
And step S3, the square wave conversion unit converts the amplitude-adjustable direct current level into a second square wave signal with controllable amplitude.
As shown in fig. 3, the square wave transforming unit transforms the dc level with adjustable amplitude by using a square wave signal with fixed frequency and fixed pulse width, or by using an SPWM square wave signal with fixed frequency and variable pulse width, to form a following square wave signal with controllable amplitude. For the purpose of distinguishing descriptions, a square wave signal with fixed frequency and fixed pulse width or an SPWM square wave signal with fixed frequency and variable pulse width is a first square wave signal PWM1 and is generated by a frequency signal unit. The square wave signal PWM1 controls the V3 to turn on and off periodically,
and step S4, the signal filtering unit filters the second square wave signal and outputs a sine wave signal.
The filtering method can adopt band-pass filtering or low-pass filtering. The band-pass filtering mode is to reserve the square wave of a specific frequency band in the square wave signal with fixed frequency and fixed pulse width and shield the square waves of other frequency bands. The low-pass filtering mode is to filter out the harmonic above the cut-off frequency in the SPWM square wave signal with fixed frequency and variable pulse width, and only keep the square wave with the cut-off frequency below.
In step S5, the signal amplifying unit amplifies the sine wave signal by the transformer T1 and converts the amplified sine wave signal into an ac signal of common ground push-pull.
As shown in fig. 6, the signal amplification unit implements push-pull conversion and power amplification using a transformer T1 as a driving unit of the power amplification unit of the push-pull topology.
And step S6, the power isolation amplifying unit converts the alternating current signal into two paths of output, the first path of output power supply output voltage supplies power for a post-stage circuit or module, and the second path of output alternating current feedback signal is sent to the AC/DC feedback signal rectifying unit.
As shown in fig. 6, the power isolation amplifying unit amplifies input power through a MOS transistor V1 and a MOS transistor V2, and performs isolation conversion through a transformer T2. Respectively outputting alternating current feedback signals to realize closed-loop control; and outputting the power supply output voltage to supply power to a post-stage circuit.
In the description of the present invention, the terms "connected" and "connected" are to be construed broadly unless otherwise explicitly defined or limited. For example, the two elements may be directly electrically connected, or indirectly electrically connected through an intermediate medium, or the two elements may be connected internally or in an interactive relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (10)
1. A linear alternating current power supply conversion device is characterized by comprising an AC/DC feedback signal rectification unit, a signal conditioning unit, a square wave conversion unit, a signal filtering unit, a signal amplification unit and a power isolation amplification unit which are sequentially connected; the device also comprises a reference direct current signal sending unit and a frequency signal unit, wherein the reference direct current signal sending unit outputs a reference direct current signal to the signal conditioning unit; the frequency signal unit outputs a first square wave signal to a second input end of the square wave conversion unit; the power isolation amplifying unit is connected with a power supply input voltage, a first output end of the power isolation amplifying unit outputs a power supply output voltage, and a second output end of the power isolation amplifying unit outputs an alternating current feedback signal to the AC/DC feedback signal rectifying unit;
the power isolation amplifying unit comprises a first MOS tube, a second MOS tube and a second transformer; one end of a primary winding of the first transformer is used as the input end of the signal amplification unit, and the other end of the primary winding of the first transformer is grounded; the grid electrode of the first MOS tube is connected with one end of a first secondary winding of the first transformer, and the grid electrode of the second MOS tube is connected with one end of a second secondary winding of the first transformer; the source electrode of the first MOS tube is connected with one end of a first primary winding of the second transformer, and the source electrode of the second MOS tube is connected with one end of a second primary winding of the second transformer; the drain electrode of the first MOS tube and the drain electrode of the second MOS tube are connected with an input voltage VIN; the other end of the first secondary winding of the first transformer and the other end of the second secondary winding of the first transformer are grounded; the other end of the first primary winding of the second transformer and the other end of the second primary winding of the second transformer are grounded; two ends of the first secondary winding of the second transformer are used as second output ends of the power isolation amplifying unit, and two ends of the second secondary winding of the second transformer are used as first output ends of the power isolation amplifying unit.
2. The linear alternating current power converter according to claim 1, wherein the signal conditioning unit comprises a first operational amplifier, a first resistor, a second resistor and a first capacitor; one end of the first resistor is used as the input end of the signal conditioning unit, the other end of the first resistor is connected with the reverse input end of the first operational amplifier, a reference direct current signal is input to the non-inverting input end of the first operational amplifier, the second resistor is connected between the reverse input end and the output end of the first operational amplifier after being connected with the first capacitor in series, and the output end of the first operational amplifier is used as the output end of the signal conditioning unit.
3. The linear alternating current power conversion device according to claim 1, wherein the square wave conversion unit comprises a second operational amplifier, a third resistor and a third MOS transistor; the non-inverting input end of the second operational amplifier is used as the input end of the square wave conversion unit, and the output end of the second operational amplifier is connected with the inverting input end; the grid electrode of the third MOS tube receives a first square wave signal, the source electrode of the third MOS tube is grounded, and the output end of the second operational amplifier is sequentially connected with the third resistor and the drain electrode of the third MOS tube and then serves as the output end of the square wave conversion unit.
4. The linear alternating current power converter according to claim 1, wherein the reference dc signal sending unit includes a fourth resistor and a zener diode, a reference voltage is input to one end of the fourth resistor, the other end of the fourth resistor is connected to a cathode of the zener diode, and an anode of the zener diode is grounded; the sampling end of the voltage stabilizing diode is connected with the cathode and is used as the output end of the reference direct current signal sending unit.
5. The linear alternating current power converter according to claim 1, wherein the AC/DC feedback signal rectifying unit comprises a full bridge rectifying circuit, an LC filter circuit and an amplifying circuit; the alternating current feedback signal is rectified by the full-bridge rectifying circuit, filtered by the LC filter circuit, amplified by the amplifying circuit and output to the signal conditioning unit.
6. The linear alternating current power converter as claimed in claim 1, wherein said frequency signal unit is a square wave generator or a digital processor.
7. The linear ac power converter as recited in claim 1, wherein said signal filtering unit is a band-pass filter or a low-pass filter.
8. A control method of a linear alternating current power supply conversion device is characterized by comprising the following steps:
step S1, the AC/DC feedback signal rectification unit collects the AC feedback signal output by the power isolation amplification unit, and outputs a DC feedback signal after rectification and amplification;
step S2, the signal conditioning unit receives the direct current feedback signal, adjusts the amplitude of the direct current feedback signal, and outputs the direct current level with adjustable amplitude;
step S3, the square wave conversion unit converts the amplitude-adjustable direct current level into a second square wave signal with controllable amplitude;
step S4, the signal filtering unit filters the second square wave signal and outputs a sine wave signal;
step S5, the signal amplification unit amplifies the sine wave signal and converts the sine wave signal into an alternating current signal of common ground push-pull;
and step S6, the power isolation amplifying unit converts the alternating current signal into two paths of output, the first path of output power supply output voltage supplies power for the rear-stage module, and the second path of output alternating current feedback signal to the AC/DC feedback signal rectifying unit.
9. The method for controlling a linear ac power converter according to claim 8, wherein the step S1 specifically comprises: the AC feedback signal is rectified by the full-bridge rectification circuit, filtered by the LC filter circuit, amplified by the amplifier circuit and then output as the DC feedback signal.
10. The method as claimed in claim 8, wherein the filtering in step S4 is performed by band-pass filtering or low-pass filtering.
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