WO2018094899A1 - 一种长寿命智能降压转换装置 - Google Patents
一种长寿命智能降压转换装置 Download PDFInfo
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- WO2018094899A1 WO2018094899A1 PCT/CN2017/075080 CN2017075080W WO2018094899A1 WO 2018094899 A1 WO2018094899 A1 WO 2018094899A1 CN 2017075080 W CN2017075080 W CN 2017075080W WO 2018094899 A1 WO2018094899 A1 WO 2018094899A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F5/00—Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/452—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output waveform
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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
Definitions
- the invention relates to a voltage converter, in particular to a long-life intelligent step-down converter for an electroless capacitor.
- the sine wave step-down converter is also called a step-down travel plug. It is a sine wave AC/AC converter that can step down and stabilize voltage and frequency in AC/AC conversion. At present, most of the AC/AC portable device market is the modified wave output.
- the step-down circuit is first integrated into DC and then filtered by aluminum electrolytic capacitor and then stepped down by BUCK, and finally inverted.
- the voltage outputted by such a step-down converter is mostly a correction wave, which is harmful to electrical equipment, and most of the internal use of aluminum electrolytic capacitor filtering, which seriously affects the life of the product, resulting in reduced safety and reliability of the product.
- this type of step-down converter has a large volume and is not suitable for carrying.
- the existing SF value of the step-down converter is too low, which easily causes interference to the power grid.
- the technical problem to be solved by the present invention is to provide a long-life intelligent step-down conversion device that can improve the service life, is easy to carry, and can avoid interference to the power grid without requiring an electrolytic capacitor.
- the present invention adopts the following technical solutions.
- a long-life intelligent step-down conversion device includes a high-frequency modulation unit, a filter inductor filter unit, and an inverter inverter unit, wherein: the high-frequency modulation unit includes a first switch tube and a second switch tube The drain of the first switch tube is used to connect a DC voltage, the source of the first switch tube is connected to the drain of the second switch tube, and the source of the second switch tube is grounded.
- the filter inductor filter unit includes a filter inductor, and a front end of the filter inductor is connected to the first switch tube a source, when the first switch is turned on and the second switch is turned off, a DC voltage that is connected to the drain of the first switch is transmitted to a rear end of the filter inductor, and when the first switch is turned off
- the second switch is turned on, the rear end of the filter inductor generates an electromotive force, and the electromotive force is discharged to the front end of the filter inductor via the second switch tube, and is applied to the gate of the first switch tube and the gate of the second switch tube by adjusting Two PWM pulse signals
- the duty ratio is such that the voltage at the back end of the filter inductor is lowered to a preset value
- the inverter inverting unit has an input end connected to a rear end of the filter inductor, and the inverter inverting unit is
- the method further includes: an AC input unit for accessing the mains AC voltage; and a rectification filter The input end is connected to the output end of the AC input unit, and the output end thereof is connected to the drain of the first switch tube.
- the rectification and filtering unit is used for rectifying and filtering the mains AC voltage to form a DC voltage and loading the same. The drain of a switch.
- the first switch tube and the second switch tube are both N-channel MOS tubes.
- the method further includes an MCU control unit, the gate of the first switch tube, the gate of the second switch tube, and the control end of the inverter inverting unit are respectively connected to the MCU control unit, by the MCU control unit And output two PWM pulse signals with opposite phases and control the switching frequency of the inverter inverting unit.
- the method further includes an AC sampling unit, the input end of the AC sampling unit is connected to the AC input unit, the output end of the AC sampling unit is connected to the MCU control unit, and the AC sampling unit is configured to collect the mains AC voltage.
- the voltage value and the phase are transmitted to the MCU control unit, and the MCU control unit is configured to: determine whether the mains AC voltage exceeds a preset value according to the voltage value collected by the AC sampling unit, and if the preset value is exceeded, a gate of the switch tube and a gate of the second switch tube respectively load two PWM pulse signals of opposite phases, and if the preset value is not exceeded, the first switch tube is kept conductive; according to the AC sampling unit
- the phase of the commercial AC voltage controls the switching frequency of the inverter inverter unit so that the inverter inverter unit outputs a sinusoidal AC voltage having the same phase as the commercial AC voltage.
- the AC sampling unit comprises an operational amplifier and a comparator, and the two input ends of the operational amplifier are respectively connected to the live line and the neutral line of the AC input unit through a current limiting resistor, and the output ends of the operational amplifier are connected
- the MCU control unit calculates the voltage value of the mains AC voltage after calculating the voltage signal output by the operational amplifier.
- the output of the operational amplifier is further connected to an inverting terminal of the comparator, the non-inverting terminal of the comparator is used for accessing a reference voltage, and the output of the comparator is connected to an MCU control unit, the MCU The control unit derives the phase of the mains AC voltage based on the voltage signal output by the comparator.
- the back end of the filter inductor is connected to a voltage sampling unit, and the output end of the voltage sampling unit is connected to the MCU control unit, and the voltage sampling unit is configured to collect the DC voltage outputted from the back end of the filter inductor and transmit the DC voltage to the MCU. control unit.
- a current sampling unit is further included, the current sampling unit includes a current transformer, and a primary winding of the current transformer is serially connected between a front end of the filter inductor and a source of the first switching transistor, The current signal of the secondary winding of the current transformer is rectified and transmitted to the MCU control unit.
- the MCU control unit controls the first switch tube and the second switch tube. Both are closed.
- the inverter inverter unit comprises an inverter bridge composed of a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, and a gate and a fourth switch of the third switch tube a gate of the tube, a gate of the fifth switch tube, and a gate of the sixth switch tube are respectively connected to the MCU control unit, and the third switch tube, the fourth switch tube, and the fifth switch tube are controlled by the MCU control unit And the sixth switch tube is turned on or off, so that the inverter inverting unit outputs sinusoidal alternating current Pressure.
- the drain of the first switch tube is used to connect a DC voltage
- the DC voltage may be a voltage obtained by rectifying and filtering the commercial power, or may be obtained by other methods.
- the DC voltage when working, is respectively connected to the gates of the first switch tube and the gates of the second switch tube to respectively connect two PWM pulse signals of opposite phases, so that the first switch tube and the second switch tube are alternately turned on,
- the first switch tube is turned on, the DC voltage is sequentially transmitted through the first switch tube and the filter inductor.
- the filter inductor When the second switch tube is turned on, the filter inductor generates self-inductance due to a sudden change in voltage, so that the back end of the filter inductor generates an electromotive force.
- the electromotive force of the filter inductor is discharged to the front end of the filter inductor via the second switch tube, and the above process is repeated, so that the output voltage of the filter inductor is lowered.
- the first cycle can be adjusted by adjusting the duty ratio of the two PWM pulse signals.
- the on-time of the switch tube wherein the shorter the on-time of the first switch tube is, the lower the output voltage of the filter inductor is, thereby realizing the sine wave intelligent step-down conversion
- the present invention can realize step-down conversion without an electrolytic capacitor, which not only improves the service life, but also is easy to carry, and can avoid interference to the power grid.
- Figure 1 is a circuit schematic of a long-life intelligent buck converter.
- FIG. 2 is a circuit schematic diagram of an AC sampling unit in a preferred embodiment of the present invention.
- FIG. 3 is a circuit schematic diagram of an MCU control unit in a preferred embodiment of the present invention.
- the invention discloses a long-life intelligent step-down conversion device, which is shown in FIG. 1 to FIG. 3, and includes a high-frequency modulation unit 30, a filter inductor filter unit 50 and an inverter inverter unit 60, wherein:
- the high-frequency modulation unit 30 includes a first switching transistor Q7 and a second switching transistor Q10.
- the drain of the first switching transistor Q7 is used to connect a DC voltage, and the source and the first switching transistor Q7
- the drain of the second switch Q10 is connected, the source of the second switch Q10 is grounded, and the gates of the first switch Q7 and the gate of the second switch Q10 are respectively connected to two PWM pulses of opposite phases. signal;
- the filter inductor filter unit 50 includes a filter inductor L3.
- the front end of the filter inductor L3 is connected to the source of the first switch transistor Q7.
- the DC voltage of the drain of the first switch transistor Q7 is transmitted to the rear end of the filter inductor L3.
- the inverter inverting unit 60 has an input end connected to a rear end of the filter inductor L3, and the inverter inverting unit 60 is configured to invert the half-wave ripple voltage outputted from the rear end of the filter inductor L3 into a sinusoidal alternating current voltage. .
- the working principle of the long-life intelligent buck switching device is as follows: the drain of the first switching transistor Q7 is used to connect a DC voltage, and the DC voltage may be a voltage obtained by rectifying and filtering the commercial power, or may be by other methods.
- the obtained DC voltage in operation, is connected to the gates of the first switching transistor Q7 and the gate of the second switching transistor Q10 by two PWM pulse signals of opposite phases, so that the first switching transistor Q7 and the second switching transistor Q10 is alternately turned on.
- the first switching transistor Q7 is turned on, the DC voltage is sequentially transmitted through the first switching transistor Q7 and the filter inductor L3.
- the second switching transistor Q10 is turned on, the filter inductor L3 is generated due to a sudden change in voltage.
- the sensation causes the back end of the filter inductor L3 to generate an electromotive force, and the electromotive force of the filter inductor L3 is discharged to the front end of the filter inductor via the second switch tube Q10, and the above process is repeated, so that the output voltage of the filter inductor L3 is lowered, in the process, by adjusting
- the duty ratio of the two PWM pulse signals can adjust the on-time of the first switching transistor Q7. The shorter the conduction time of the first switching transistor Q7 is, the lower the output voltage of the filter inductor L3 is.
- the realization of the sine wave intelligent buck converter Based on the above principle, the present invention can realize step-down conversion without an electrolytic capacitor, which not only improves the service life, but also is easy to carry, and can avoid interference to the power grid.
- the DC voltage is preferably a voltage obtained by rectifying and filtering the commercial power. Therefore, the long-life intelligent buck switching device further includes:
- a rectifying and filtering unit 20 the input end of which is connected to the output end of the AC input unit 10, the output end of which is connected to the drain of the first switching tube Q7, and the rectifying and filtering unit 20 is used for rectifying and filtering the mains AC voltage.
- a DC voltage is formed and applied to the drain of the first switching transistor Q7.
- the rectifying action of the rectifying and filtering unit 20 is used to enable the input side of the high-frequency modulation unit 30 to be connected to a direct current, which is processed by the high-frequency modulation unit 30 and the inductive filtering unit 50, and then transmitted.
- the inverter inverting unit 60 is a half-wave ripple voltage, and the inverter inverting unit 60 only needs to invert one half of the adjacent two half waves to form a sinusoidal alternating current.
- the present invention firstly uses the electrolytic capacitor to filter the smoothed direct current, and then converts the smoothed direct current into the alternating current.
- the alternating current can be obtained only by performing the phase inversion processing, thereby greatly improving the conversion efficiency. .
- the first switching transistor Q7 and the second switching transistor Q10 are both N-channel MOS transistors.
- the embodiment further includes an MCU control unit 80, a gate of the first switch tube Q7, a gate of the second switch tube Q10, and an inverter.
- the control terminals of the inverter unit 60 are respectively connected to the MCU control unit 80, and the MCU control unit 80 outputs two PWM pulse signals of opposite phases and controls the switching frequency of the inverter inverting unit 60.
- the MCU control unit 80 includes a single piece Machine U1 and its peripheral circuits.
- the embodiment further includes an AC sampling unit 70.
- the input end of the AC sampling unit 70 is connected to the AC input unit 10.
- the output of the AC sampling unit 70 is connected to the MCU control unit 80.
- the AC sampling unit 70 is used to collect the voltage value and phase of the mains AC voltage and transmit it to the MCU control unit 80, which is used to:
- the switching frequency of the inverter inverting unit 60 is controlled in accordance with the phase of the commercial AC voltage collected by the AC sampling unit 70, so that the inverter inverting unit 60 outputs a sinusoidal alternating voltage having the same phase as the commercial AC voltage.
- the AC sampling unit 70 includes an operational amplifier U9B and a comparator U9A.
- the two input terminals of the operational amplifier U9B are respectively connected to the live line of the AC input unit 10 through a current limiting resistor.
- the zero line, the output end of the operational amplifier U9B is connected to the MCU control unit 80, and the MCU control unit 80 calculates the voltage value of the commercial AC voltage after calculating the voltage signal output by the operational amplifier U9B.
- the output end of the op amp U9B is also connected to the inverting terminal of the comparator U9A, the non-inverting terminal of the comparator U9A is used to access the reference voltage, and the output end of the comparator U9A is connected to the MCU control unit 80.
- the MCU control unit 80 derives the phase of the commercial AC voltage based on the voltage signal output from the comparator U9A.
- phase adoption is also performed.
- the MCU control unit 80 can correspondingly control the switching frequency of the inverter inverting unit 60 to make the inverter.
- the voltage output by the inverter unit 60 is the same as the phase of the commercial AC voltage, thereby achieving a higher PF value to reduce interference to the power grid.
- a voltage sampling unit 90 is connected to the rear end of the filter inductor L3, and an output end of the voltage sampling unit 90 is connected to the MCU control unit 80, and the voltage sampling unit 90 is used to collect the filter inductor L3 back end.
- the output DC voltage is transmitted to the MCU control unit 80.
- the voltage sampling unit 90 can be composed of two or more sampling resistors connected in series.
- the embodiment further includes a current sampling unit 40.
- the current sampling unit 40 includes a current transformer CS1.
- the primary winding of the current transformer CS1 is connected in series with the front end of the filter inductor L3.
- the current signal of the secondary winding of the current transformer CS1 is rectified and transmitted to the MCU control unit 80.
- the MCU control unit 80 controls The first switching transistor Q7 and the second switching transistor Q10 are both turned off.
- the above preset values can be written in advance to the MCU control unit 80 for comparison.
- the inverter inverting unit 60 includes an inverter bridge composed of a third switching transistor Q1, a fourth switching transistor Q2, a fifth switching transistor Q3, and a sixth switching transistor Q4.
- the gate of the third switching transistor Q1, the gate of the fourth switching transistor Q2, the gate of the fifth switching transistor Q3, and the gate of the sixth switching transistor Q4 are respectively connected to the MCU control unit 80, and are controlled by the MCU.
- the unit 80 controls the third switching transistor Q1, the fourth switching transistor Q2, the fifth switching transistor Q3, and the sixth switching transistor Q4 to be turned on or off to cause the inverter inverting unit 60 to output a sinusoidal alternating voltage.
- the grid voltage is passed to the rectifying and filtering unit through the AC socket, the fuse F2, the lightning protection resistor RV1, the common mode suppression filter inductor L1 and the CX1 group filter circuit.
- Control chip U1 is sampled by AC input voltage consisting of R126, R127, R128, R38, R129, R130, R131, R45, C39, R39, R47, C41, U9, R44, D15, and R46, C40, R33, R34, D1
- the AC input phase sampling circuit composed of R31 and R32 is used to determine the working mode of the high frequency modulation circuit.
- D3 and C1 form a rectifying and filtering circuit, and D3 divides the grid voltage into two half-waves to filter out clutter interference through CBB capacitor C1.
- the high-frequency modulation circuit is composed of Q7 and Q10.
- the control chip U1 outputs the high-frequency PWM1 and PWM2 signals respectively through the driving circuits D4 and R8.
- R22, D2, R90, R95 are sent to the GAT of Q7 and the GAT of Q10.
- the control pulse width of Q7 and Q10 is adjusted according to the sinusoidal variation adopted by the AC sampling circuit and the phase of Q7 and Q10 is 180 degree inverted;
- Q7 will be turned on all the time, Q10 is always turned off, and the rectified and filtered AC half-wave voltage flows directly to the filtering unit 50 via Q7.
- the principle of the specific step-down is: when Q7 is turned on, the DC high voltage on C1 is changed to the pulse level, and the pulse level is passed through the step-down filter inductor L3 of the filter circuit, and the high impedance formed by the high-frequency voltage current is performed by the filter inductor.
- the voltage is stepped down to achieve a high voltage conversion to a low voltage, and the high frequency pulse is filtered by L3 to leave a low frequency half wave voltage.
- the high-frequency filter circuit is composed of L3, and the high-frequency voltage and current modulated by Q7 and Q10 are converted into an AC half-wave voltage after being filtered by L3; if the Q7 is operated in the power frequency mode, the filter circuit does not function. Equivalent to straight through.
- the L3 filtered voltage is sent to the U1 control chip by a voltage sampling circuit composed of R13 and R15, and the duty ratio of the PWM of Q7 and Q10 is determined by U1. That is, the high frequency modulation circuit, the current sampling, the filter circuit and the voltage sampling circuit form a closed loop to adjust the duty ratio of Q7 and Q10 to achieve the stability of the filtered output voltage.
- CS1, BD2, R91, and R93 form a current sampling circuit. It is connected in series at the output of the modulation circuit to sample the output current of the circuit.
- Q7 When the circuit over-current, overload or short-circuit occurs, Q7 will be turned off to make the subsequent stage circuit output.
- the inverter inverter circuit is composed of Q1, Q2, Q3, and Q4.
- the first output half-wave AC voltage through the L3 filter inductor is sent to the load through Q1 and Q4; when the second output half-wave AC through the L3 filter inductor
- the voltage is applied to the load via Q2 and Q3, which forms a complete power frequency sinusoidal AC voltage across the load.
- the PWM signal outputted by the control chip U1 is sent to the GATE poles of Q1, Q2, Q3, and Q4 by the PWM1H, PWM2H, PWM1L, and PWM2L through the driving circuit.
- the phase of the inverter inverter circuit is to lock the inverter inverter circuit according to the phase taken by the input sampling circuit, that is, the frequency and phase of the inverter inverter circuit will be consistent with the frequency and phase of the input voltage.
- the long-life intelligent step-down conversion device disclosed by the invention has the characteristics of small body size, light weight, convenient push belt, etc., and can automatically adjust the output voltage in the input full voltage range, and the output voltage is output in a pure sinusoidal mode, and the load is set.
- the damage is small and compatible; at the same time, the invention does not use aluminum electrolytic capacitor filtering, and uses a long-life CBB capacitor, so the product has a longer life, and in addition, the output voltage will follow the AC grid change, so that the present invention has a high PF. Value, less interference to the grid.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
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Abstract
Description
Claims (10)
- 一种长寿命智能降压转换装置,其特征在于,包括有一高频调制单元、一滤波电感滤波单元及一逆变倒相单元,其中:所述高频调制单元包括有第一开关管和第二开关管,所述第一开关管的漏极用于接入直流电压,所述第一开关管的源极与第二开关管的漏极相连,所述第二开关管的源极接地,所述第一开关管的栅极和第二开关管的栅极分别接入相位相反的两路PWM脉冲信号;所述滤波电感滤波单元包括有滤波电感,所述滤波电感的前端连接于第一开关管的源极,当所述第一开关管导通而第二开关管截止时,所述第一开关管漏极接入的直流电压传输至滤波电感的后端,当所述第一开关管截止而第二开关管导通时,所述滤波电感的后端产生电动势,该电动势经由第二开关管向滤波电感的前端泄放,通过调整加载于第一开关管栅极和第二开关管栅极的两路PWM脉冲信号的占空比,以令滤波电感后端的电压降低至预设值;所述逆变倒相单元的输入端连接于滤波电感的后端,所述逆变倒相单元用于将滤波电感后端输出的半波脉动电压逆变转换为正弦交流电压。
- 如权利要求1所述的长寿命智能降压转换装置,其特征在于,还包括有:一交流输入单元,其用于接入市电交流电压;一整流滤波单元,其输入端连接交流输入单元的输出端,其输出端连接第一开关管的漏极,所述整流滤波单元用于将市电交流电压进行整流和滤波后,形成直流电压并加载于第一开关管的漏极。
- 如权利要求1所述的长寿命智能降压转换装置,其特征在于,所述第一开关管和第二开关管均为N沟道MOS管。
- 如权利要求2所述的长寿命智能降压转换装置,其特征在于,还包括有一MCU控制单元,所述第一开关管的栅极、第二开关管的栅极和逆变倒相单元的控制端分别连接于MCU控制单元,藉由所述MCU控制单元而输出相位相反的两路PWM脉冲信号以及控制逆变倒相单元的转换频率。
- 如权利要求4所述的长寿命智能降压转换装置,其特征在于,还包括有一交流采样单元,所述交流采样单元的输入端连接于交流输入单元,所述交流采样单元的输出端连接于MCU控制单元,所述交流采样单元用于采集市电交流电压的电压值和相位并传输至MCU控制单元,所述MCU控制单元用于:根据交流采样单元采集的电压值判断市电交流电压是否超过预设值,若超过预设值,则向所述第一开关管的栅极和第二开关管的栅极分别加载相位相反的两路PWM脉冲信号,若未超过预设值,则令所述第一开关管保持导通;根据交流采样单元采集的市电交流电压的相位而控制逆变倒相单元的转换频率,以令逆变倒相单元输出与市电交流电压相位相同的正弦交流电压。
- 如权利要求5所述的长寿命智能降压转换装置,其特征在于,所述交流采样单元包括有运放和比较器,所述运放的两个输入端分别通过限流电阻而连接于交流输入单元的火线和零线,所述运放的输出端连接于MCU控制单元,所述MCU控制单元对运放输出的电压信号运算后得出市电交流电压的电压值。
- 如权利要求6所述的长寿命智能降压转换装置,其特征在于,所述运放的输出端还连接于比较器的反相端,所述比较器的同相端用于接入基准电压,所述比较器的输出端连接于MCU控制单元,所述MCU控制单元根据比较器输出的电压信号而得出市电交流电压的相位。
- 如权利要求4所述的长寿命智能降压转换装置,其特征在于,所述滤波电感的后端连接有一电压采样单元,所述电压采样单元的输出端连接于MCU控制单元,所述电压采样单元用于采集滤波电感后端输出的直流电压并传输至MCU控制单元。
- 如权利要求4所述的长寿命智能降压转换装置,其特征在于,还包括有电流采样单元,所述电流采样单元包括有电流互感器,所述电流互感器的原边绕组串接于滤波电感的前端与第一开关管的源极之间,所述电流互感器副边绕组的电流信号经过整流后传输至MCU控制单元,当所述电流互感器副边绕组的电流超过预设值时,所述MCU控制单元控制第一开关管和第二开关管均截止。
- 如权利要求5所述的长寿命智能降压转换装置,其特征在于,所述逆变倒相单元包括由第三开关管、第四开关管、第五开关管和第六开关管组成的逆变桥,所述第三开关管的栅极、第四开关管的栅极、第五开关管的栅极和第六开关管的栅极分别连接于MCU控制单元,藉由所述MCU控制单元而控制第三开关管、第四开关管、第五开关管和第六开关管导通或截止,以令所述逆变倒相单元输出正弦交流电压。
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US15/571,841 US10291143B2 (en) | 2016-11-25 | 2017-02-28 | Voltage converter without electrolytic capacitor |
JP2017559603A JP6545286B2 (ja) | 2016-11-25 | 2017-02-28 | 長寿命のスマート降圧コンバータ |
CA3021232A CA3021232A1 (en) | 2016-11-25 | 2017-02-28 | Long-life intelligent step-down conversion device |
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CN201611061814.1A CN106787790B (zh) | 2016-11-25 | 2016-11-25 | 一种长寿命智能降压转换装置 |
CN201611061814.1 | 2016-11-25 |
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JP (1) | JP6545286B2 (zh) |
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JP2020501486A (ja) * | 2016-11-25 | 2020-01-16 | 広東百事泰電子商務股▲ふん▼有限公司Guangdong Bestek E−Commerce Co.,Ltd. | 正弦波インテリジェント降圧変換装置 |
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JP6545286B2 (ja) | 2019-07-17 |
US20180351471A1 (en) | 2018-12-06 |
CN106787790B (zh) | 2021-04-13 |
JP2018538769A (ja) | 2018-12-27 |
CN106787790A (zh) | 2017-05-31 |
US10291143B2 (en) | 2019-05-14 |
CA3021232A1 (en) | 2018-05-31 |
US20190229638A1 (en) | 2019-07-25 |
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