CN110061508B - Bypass stepless voltage regulating device - Google Patents
Bypass stepless voltage regulating device Download PDFInfo
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- CN110061508B CN110061508B CN201910335796.9A CN201910335796A CN110061508B CN 110061508 B CN110061508 B CN 110061508B CN 201910335796 A CN201910335796 A CN 201910335796A CN 110061508 B CN110061508 B CN 110061508B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a bypass stepless voltage regulating device which comprises a first circuit, a second circuit, a third circuit, a first relay, a second relay, a compensation transformer and a converter module, wherein the converter module comprises an inductor, a first capacitor, a second capacitor, a first switch, a second switch, a fourth circuit, a third switch, a fourth switch and four voltage regulating units, and the voltage regulating units comprise a fifth circuit, a first resistor, a second resistor, a diode and a third capacitor. The utility model can not only utilize the converter module to quickly and steplessly regulate the voltage with the required amplitude according to the current voltage condition, but also ensure that the voltage is always kept in the standard qualified voltage range due to high voltage regulation precision and no obvious hysteresis, and can also utilize the converter module to output capacitive waveforms, reduce current reactive components in a circuit, improve the power factor of a power supply system and the actual output of a device and ensure the operation safety of electric equipment.
Description
Technical Field
The utility model relates to the field of pressure regulating devices, in particular to a bypass stepless pressure regulating device.
Background
The voltage qualification rate is one of important assessment indexes of voltage quality, and can intuitively reflect the voltage quality index of a user, and has direct influence on the stability of a power system, the safe operation of power equipment, the industrial and agricultural safe production and the domestic electricity consumption of people. Today, through the open development of reform in our country, economy flies fast, people's living standard is constantly improved, household electrical appliances enter common people's life, original power distribution network can not meet the electricity demand, add receive the load round the clock, seasonal load change, the power supply radius is long, the influence of factors such as load distribution inequality, line voltage fluctuation is very big when power consumption peak and low valley, transformer output is insufficient when power consumption peak, the voltage is too low can cause equipment output to be insufficient or work abnormally even damage, the voltage is too high when power consumption low can influence the life-span of consumer again. Therefore, the improvement of the voltage qualification rate is an important task for the power supply department, which not only affects the image of a power supply company, but also is a civil problem, and affects the quality of the standard of living of common people.
The automatic voltage regulator for low voltage line is one low voltage treating device designed specially for power supply area with long line radius, small line diameter and great line voltage loss. The device mainly comprises a compensation transformer, a controller, an alternating current contactor and the like, when the line voltage is too low, the controller controls the alternating current contactor to act to switch the compensation transformer, stepped compensation boosting is carried out on the line voltage, and voltage stabilization after boosting cannot be achieved. The automatic voltage regulator for the low-voltage line has the function of solving the problem of low voltage to a certain extent, but the voltage regulating mode belongs to a stepped mode, namely, the fluctuation amplitude of the output voltage influenced by the input voltage is relatively large, the precision of the stabilized output voltage is low, and the voltage regulating speed of the device is lagged for the working condition of frequent fluctuation of the input voltage, so that the on-site condition cannot be met. The overvoltage can not be in time moved back or enter an overvoltage protection state when serious, and the voltage regulating effect of the voltage regulator is greatly influenced.
The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The utility model aims to provide a bypass stepless voltage regulating device, so that the defects of fluctuation, high precision and easy hysteresis of the existing automatic voltage regulator of a low-voltage line are overcome.
In order to achieve the above object, the present utility model provides a bypass stepless voltage regulating device, comprising: the front end of the first circuit is connected with the live wire; the front end of the second circuit is connected with the zero line; the rear end of the third line is connected with the zero line; the first relay is connected in series with the live wire; the second relay is connected in series at the front end of the first circuit; a compensation transformer having a primary coil connected in parallel with the first relay to a live wire; the secondary coil of the compensation transformer is connected in series with the rear end of the third circuit; and a converter module, comprising: one end of the inductor is connected with the rear end of the first circuit, and the other end of the inductor is connected with the front end of the third circuit; one end of the first capacitor is connected with the rear end of the second circuit, and the other end of the first capacitor is connected with the front end of the third circuit; one end of the second capacitor is connected with the front part of the first circuit, and the other end of the second capacitor is connected with the front part of the second circuit; the first switch and the second switch are sequentially connected in series in the middle of the first circuit; a fourth circuit, the front end of which is connected to the first circuit and is positioned behind the second switch, and the rear end of which is connected to the rear parts of the two circuits; the third switch and the fourth switch are connected in series with the fourth switch Guan Yixu in the middle of the fourth circuit; and four voltage regulating units, a first one of the voltage regulating units is connected to the first line in parallel with the first switch, a second one of the voltage regulating units is connected to the first line in parallel with the second switch, a third one of the voltage regulating units is connected to the fourth line in parallel with the third switch, and a fourth one of the voltage regulating units is connected to the fourth line in parallel with the fourth switch; each voltage regulating unit comprises a fifth circuit, a first resistor, a second resistor, a diode and a third capacitor, wherein the diode and the third capacitor are sequentially connected in series on the fifth circuit, and the first resistor and the second resistor are connected with the diode in parallel on the fifth circuit.
Preferably, in the above technical solution, the electronic device further includes a main controller, the main controller detects an input voltage and an output voltage on the power supply line through a voltage detection device, and the main controller is configured to control on-off of the first relay, the second relay, the first switch, the second switch, the third switch, and the fourth switch.
Preferably, in the above technical solution, the first relay is a normally closed relay, and the second relay is a normally open relay.
Preferably, in the above technical solution, the first switch, the second switch, the third switch and the fourth switch are all alternating current tube switches.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model can not only utilize the converter module to quickly and steplessly regulate the voltage with the required amplitude according to the current voltage condition, but also ensure that the voltage is always kept in the standard qualified voltage range due to high voltage regulation precision and no obvious hysteresis, and can also utilize the converter module to output capacitive waveforms, reduce current reactive components in a circuit, improve the power factor of a power supply system and the actual output of a device and ensure the operation safety of electric equipment.
Drawings
FIG. 1 is a schematic diagram of a bypass stepless regulator according to the present utility model;
fig. 2 is a schematic diagram of the structure of a converter module bypassing a stepless voltage regulating device according to the present utility model.
The main reference numerals illustrate:
1-live wire, 2-neutral wire, 3-arrester, 4-circuit breaker, 5-current transformer, 6-first circuit, 7-second circuit, 8-third circuit, 9-first relay, 10-second relay, 11-compensation transformer, 12-converter module, 13-inductance, 14-first capacitance, 15-second capacitance, 16-first switch, 17-second switch, 18-fourth circuit, 19-third switch, 20-fourth switch, 21-voltage regulating unit, 22-main controller, 23-first resistor, 24-second resistor, 25-diode, 26-third capacitance, 27-fifth circuit.
Detailed Description
The following detailed description of embodiments of the utility model is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the utility model is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
Fig. 1 to 2 show a schematic structure of a bypass stepless voltage regulating device according to a preferred embodiment of the present utility model, which includes a first line 6, a second line 7, a third line 8, a first relay 9, a second relay 10, a compensation transformer 11, and a converter module 12. Referring to fig. 1, the transmission line is a conventional transmission line, an arrester (FV) 3 for lightning protection is provided at an input end of a live wire 1, and a breaker (QF) 4 for manually cutting off a power supply is further provided at input ends of the live wire 1 and a neutral wire 2 behind the arrester 3, and the breaker 4 may be a plastic case type breaker. In addition, the input and output of the live wire 1 are each provided with a current Transformer (TA) 5 for detecting the current at the input and output, respectively.
With continued reference to fig. 1, the front end of the first line 6 is connected with the live line 1, the front end of the second line 7 is connected with the neutral line 2, the rear end of the third line 8 is connected with the neutral line 2, and the connection between the third line 8 and the neutral line 2 is located behind the connection between the second line 7 and the neutral line 2. The first relay 9 is connected in series with the live wire 1, and the first relay 9 is positioned behind the connection part of the first line 6 and the live wire 1. The second relay 10 is connected in series to the front end of the first circuit 6. The primary winding of the compensation transformer (TBa) 11 is connected in parallel with the first relay 9 on the live wire 1, and the secondary winding of the compensation transformer 11 is connected in series at the rear end of the third line 8. Preferably, the first relay 9 is a normally closed relay and the second relay 10 is a normally open relay, so that when no voltage regulation is required, the current on the fire wire passes directly through the first relay 9 and the second relay 10 turns off the transformer module 12. The converter module 12 comprises an inductance 13, a first capacitance 14, a second capacitance 15, a first switch 16, a second switch 17, a fourth line 18, a third switch 19, a fourth switch 20 and four voltage regulating units 21.
With continued reference to fig. 1 and 2, one end of the inductor (Lc) 13 is connected to the rear end of the first line 6, and the other end of the inductor 13 is connected to the front end of the third line 8; first capacitor (C) A ) One end of the first capacitor 14 is connected to the rear end of the second line 7, and the other end of the first capacitor 14 is connected to the front end of the third line 8. One end of the second capacitor (C) 15 is connected to the front of the first line 6, the connection is located behind the second relay 10, and the other end of the second capacitor 15 is connected to the front of the second line 7. The function of the second capacitor 15 is EMI filtering.
With continued reference to fig. 1 and 2, the first switch 16 and the second switch 17 are serially connected in sequence in the middle of the first circuit 6, the first switch 16 is located at the rear of the connection between the second capacitor 15 and the first circuit 6, and the second switch 17 is located at the front of the inductor 13. The front end of the fourth line 18 is connected to the first line 6 and is located behind the second switch 17, i.e. the front end of the fourth line 18 is located between the second switch 17 and the inductor 13. The rear end of the fourth line 18 is connected to the rear of the second line 7, i.e. the rear end of the fourth line is located between the connection of the second capacitor 15 to the second line 7 and the connection of the first capacitor 14 to the second line 7. The third switch 19 and the fourth switch 20 are serially connected in series in the middle of the fourth line 18. Preferably, the first switch 16, the second switch 17, the third switch 19 and the fourth switch 20 are all alternating current switching tubes (PS).
With continued reference to fig. 1 and 2, among the four voltage regulating units 21 of the transformer module 12, a first voltage regulating unit 21 is connected to the first line 6 in parallel with the first switch 16, a second voltage regulating unit 21 is connected to the first line 6 in parallel with the second switch 17, a third voltage regulating unit 21 is connected to the fourth line 18 in parallel with the third switch 19, and a fourth voltage regulating unit 21 is connected to the fourth line 18 in parallel with the fourth switch 20, and by controlling the on-off of the different switches, it is possible to adjust which voltage regulating units 21 the current passes through.
With continued reference to fig. 1 and 2, each voltage regulating unit 21 includes a fifth line 27, a first resistor 23, a second resistor 24, a diode 25, and a third capacitor 26, where the fifth line 27 is distributed in parallel with the corresponding switch, the diode 25 and the third capacitor 26 are sequentially connected in series on the fifth line 27, and the first resistor 23 and the second resistor 24 are connected in parallel with the diode 25 on the fifth line 27. The first resistor 23, the second resistor 24 and the third capacitor 26 form an RC absorption loop to protect the silicon controlled rectifier from breakdown caused by surge current or commutation overvoltage, and the diode 25 can rapidly guide spike pulse to the capacitor to improve the effect of absorbing spike by the capacitor. Each resistor can enable the capacitor voltage to be released when the tube is conducted, so that preparation is made for the next energy absorption. The switch opening moment current is drawn from the diode 25 and not from the resistor.
With continued reference to fig. 1, the present utility model further includes a main controller 22, where the main controller 22 detects the input voltage and the output voltage on the power supply line through a voltage detection device, and may further detect the input current and the output current on the power supply line through a current detection device to implement monitoring. And the main controller 22 is used for controlling the on-off of the first relay 9, the second relay 10, the first switch 16, the second switch 17, the third switch 19 and the fourth switch 20. Model TMS320F2812PGFACG-41APTSW of main controller 22
The stepless voltage regulation process of the utility model is as follows:
judging whether to enter a voltage regulation working mode or not by detecting line input voltage Ui and output voltage Uo, after entering the voltage regulation working mode, calculating a required voltage according to device output voltage Uo feedback, rapidly driving a converter module 12 to generate a continuously adjustable required amplitude voltage Uo' which is added in a secondary loop of a compensation transformer 11, and then superposing electromagnetic induction voltage delta U which can be passed by the compensation transformer 11 in a main loop, wherein the output voltage is equal to Uo=Ui+delta U (continuously adjustable); i.e. to raise the voltage to within the national standard acceptable voltage range and to stabilize the specified value.
Referring to fig. 2, the transformer module 12 is a circuit structure of a Buck AC/AC converter, in which the first switch (PS 1) 16 and the second switch (PS 2) 17 are a pair of AC switching transistors, the third switch (PS 3) 19 and the fourth switch (PS 4) 20 are another pair of AC switching transistors, the two pairs of AC switching transistors are turned on complementarily, the on time is DTS, (1-D) TS, where D is a duty cycle, and TS is a switching period. The duty ratio D is a constant, and according to ω=2pi f, ω is an input voltage angular frequency, and f is an input voltage frequency, it is known that the output voltage Uo is a sinusoidal variation, and the phase thereof is consistent with the input voltage Uin, but the amplitude thereof is not greater than the amplitude Um of the input voltage. According to the polarity difference between the input voltage Uin and the current iLc of the inductor 13, there are four different phases in one input voltage period: uin >0, iLc >0; uin >0, iLc <0; uin <0, ilc <0; uin <0, iLc >0.
U in ＝U m sin_t
(1) When Uin >0, ilc >0 occurs:
the second switch (PS 2) 17 and the fourth switch (PS 4) 20 are kept constant, the first switch (PS 1) 16 and the third switch (PS 3) 19 are complementarily turned on at high frequency, the phase circuit has two switching modes, when the first switch (PS 1) 16 is turned on, the third switch (PS 3) 19 is turned off, and the input voltage supplies power to the first capacitor (Ca) 14 and the load through the first switch (PS 1) 16 and the inductor (Lc) 13; when the first switch (PS 1) 16 is turned off and the third switch (PS 3) 19 is turned on, the inductor current iLc freewheels through the inductor (Lc) 13, the first capacitor (Ca) 14 and the reverse diode of the load and the third switch (PS 3) 19, and the inductor (Lc) 13 and the first capacitor (Ca) 14 together supply power to the load.
(2)Uin>0,iLc<0
A second switch (PS 2) 17, a fourth switch (PS 4) 20, a first switch (PS 1) 16, a third switch (PS 3) 19, the stage circuit having two switching modes, when the first switch (PS 1) 16 is on, the third switch (PS 3) 19, the input voltage supplying power to the first capacitor (Ca) 14 and the load through a reverse diode of the first switch (PS 1) 16, an inductance (Lc) 13; when the first switch (PS 1) 16 is turned off and the third switch (PS 3) 19 is turned on, the inductor current iLc freewheels through the inductor (Lc) 13, the third switch (PS 3) 19, the first capacitor (Ca) 14 and the load, and the inductor (Lc) 13 and the first capacitor (Ca) 14 together supply power to the load.
(3)Uin<0,iLc<0
The first switch (PS 1) 16 and the third switch (PS 3) 19 are constantly on, and the second switch (PS 2) 17 and the fourth switch (PS 4) 20 are complementarily turned on at high frequency. The circuit has two switching modes, when the second switch (PS 2) 17 is turned on and the fourth switch (PS 4) 20 is turned off, the input voltage supplies power to the first capacitor (Ca) 14 and the load through the second switch (PS 2) 17 and the inductor (Lc) 13; when the second switch (PS 2) 17 is turned off and the fourth switch (PS 4) 20 is turned on, the inductor current iLc is freewheeling via the inductor (Lc) 13, the reverse diode of the fourth switch (PS 4) 20, the first capacitor (Ca) 14 and the load, and the inductor (Lc) 13 and the first capacitor (Ca) 14 together supply power to the load.
(4)Uin<0,iLc>0
The first switch (PS 1) 16 and the third switch (PS 3) 19 are constantly on, and the second switch (PS 2) 17 and the fourth switch (PS 4) 20 are complementarily turned on at high frequency. The circuit has two switching modes, when the second switch (PS 2) 17 is turned on and the fourth switch (PS 4) 20 is turned off, the input voltage supplies power to the first capacitor (Ca) 14 and the load through the reverse diode of the second switch (PS 2) 17 and the inductor (Lc) 13; when the second switch (PS 2) 17 is turned off and the fourth switch (PS 4) 20 is turned on, the inductor current iLc freewheels through the inductor (Lc) 13, the first capacitor (Ca) 14 and the load, and the fourth switch (PS 4) 20, and the inductor (Lc) 13 and the first capacitor (Ca) 14 together supply power to the load.
There are four different phases according to the fact that in one input voltage period: uin >0, iLc >0; uin >0, iLc <0; uin <0, ilc <0; uin <0, iLc >0. After feedback sampling, the output voltage is compared with a reference output voltage signal through a main controller to obtain a high-frequency PWM control signal, and a second switch (PS 2) 17 is inverted to obtain a control signal SN2; after the input voltage is sampled, a low-frequency input voltage polarity signal is generated through a main controller, and a signal SN1 is obtained after the first switch (PS 1) 16 is in phase opposition; the second switches (PS 2) 17, SN2 are respectively logically or modulated with the first switches (PS 1) 16, SN1 to generate control signals K1, K2, K3, K4 of the first switch (PS 1) 16, the second switch (PS 2) 17, the third switch (PS 3) 19, the fourth switch (PS 4) 20, and the output voltage Uo is obtained by changing the on time of the switches.
2) Bypass: when the device input voltage is within the national standard qualification range or a fault protection function occurs, the main controller 22 judges and turns off the second relay 10, and at this time, the second relay 10 does not need power maintenance any more so as to realize bypass.
3) Improving the power factor:
the bypass stepless voltage regulating device can output capacitive waveforms according to the running condition of the circuit by utilizing power electronics in the converter module 12, reduce current reactive components in the circuit, improve the power factor of a power supply system and the actual output of the device, and improve the running safety of electric equipment.
4) On-line monitoring:
the main controller 22 can measure and count the operation parameters of the whole set of equipment, and interact with the data of the remote server system through GPRS to realize the online monitoring function of the distribution transformer, and mainly comprises the following steps:
(1) collecting voltage and current, and realizing measurement of voltage, current, active power, reactive power and power factor;
(2) the converter module 12 acts times, total acts times and counts the running time;
5) Overload and short circuit protection:
the bypass stepless voltage regulating device is provided with the circuit breaker 4, and when overload or short circuit occurs, the corresponding circuit breaker 4 breaks to achieve the protection function. When overload or short circuit occurs in the compensation transformer 11, the main controller 22 controls the second relay 10 to act according to the set protection parameters, so as to switch the device to a bypass state and protect the safety of equipment.
6) Lightning protection:
the lightning arrester 3 is arranged in the distribution box to effectively prevent damage caused by lightning overvoltage and operation overvoltage. If an overvoltage is encountered, the arrester 3 conducts to introduce an inrush current into the ground system.
The main controller 22 of the utility model collects the output voltage (Uo) and input voltage (Ui) of the power supply line to compare, when disqualification, the first contactor 9 is disconnected, the second relay 10 is disconnected, so as to connect the transformer module 12 for voltage regulation, the main controller 22 drives the transformer module 12 to generate continuous voltage with the same phase and required amplitude to be added in the secondary circuit of the compensation transformer 11, the continuously adjustable voltage (delta U) is overlapped to the power supply line through the electromagnetic induction of the compensation transformer 11, namely, the output voltage is equal to uo=ui+delta U; because the output voltage of the converter module 12 is continuously and automatically regulated, the output voltage of the power supply line is stable after passing through the compensation transformer 12, i.e. the output voltage is stable at a certain value within the national standard qualified voltage; when the input voltage is recovered to be qualified in the national standard, the second relay 10 is turned off, the first relay 9 is turned on, so that the compensation transformer 11 and the converter module 12 stop working, and the stepless voltage regulating device enters a bypass. Compared with the traditional line voltage regulator, the bypass stepless voltage regulating device solves the problems of low voltage output regulating speed, large output voltage fluctuation, large power consumption of the bypass device and the like, the voltage with continuously adjustable required amplitude is generated through the converter module 12 and is superposed on the main loop of the compensation transformer 11, and power electrons in the converter module 12 can rapidly work at high frequency, so that the output voltage is at a certain value in the set national qualified voltage and is not influenced by the fluctuation of the input voltage. The bypass stepless voltage regulating device can output capacitive waveforms according to the running condition of the circuit by utilizing power electronics in the converter module 12, reduce current reactive components in the circuit, improve the power factor of a power supply system and the actual output of the device, and improve the running safety of electric equipment.
The foregoing descriptions of specific exemplary embodiments of the present utility model are presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the utility model and its practical application to thereby enable one skilled in the art to make and utilize the utility model in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the utility model be defined by the claims and their equivalents.
Claims (3)
1. A bypass stepless voltage regulating device, comprising:
the front end of the first circuit is connected with the live wire;
the front end of the second circuit is connected with the zero line;
the rear end of the third line is connected with the zero line;
the first relay is connected in series with the live wire;
the second relay is connected in series at the front end of the first circuit;
a compensation transformer having a primary coil connected in parallel with the first relay to a live wire; the secondary coil of the compensation transformer is connected in series with the rear end of the third circuit; and
a converter module, comprising:
one end of the inductor is connected with the rear end of the first circuit, and the other end of the inductor is connected with the front end of the third circuit;
one end of the first capacitor is connected with the rear end of the second circuit, and the other end of the first capacitor is connected with the front end of the third circuit;
one end of the second capacitor is connected with the front part of the first circuit, and the other end of the second capacitor is connected with the front part of the second circuit;
the first switch and the second switch are sequentially connected in series in the middle of the first circuit;
a fourth circuit, the front end of which is connected to the first circuit and is positioned behind the second switch, and the rear end of which is connected to the rear parts of the two circuits;
the third switch and the fourth switch are connected in series with the fourth switch Guan Yixu in the middle of the fourth circuit; and
four voltage regulating units, a first voltage regulating unit is connected on the first line in parallel with the first switch, a second voltage regulating unit is connected on the first line in parallel with the second switch, a third voltage regulating unit is connected on the fourth line in parallel with the third switch, and a fourth voltage regulating unit is connected on the fourth line in parallel with the fourth switch; each voltage regulating unit comprises a fifth line, a first resistor, a second resistor, a diode and a third capacitor, wherein the diode and the third capacitor are sequentially connected in series on the fifth line, and the first resistor and the second resistor are connected with the diode in parallel on the fifth line;
judging whether to enter a voltage regulation working mode or not by detecting line input voltage Ui and output voltage Uo, after entering the voltage regulation working mode, calculating a required voltage according to device output voltage Uo feedback, rapidly driving the converter module to generate a continuously adjustable required amplitude voltage Uo' which is added in a secondary loop of a compensation transformer, and superposing electromagnetic induction voltage delta U in a main loop by the compensation transformer, wherein the output voltage is equal to Uo=Ui+delta U; within one input voltage period, there are four different phases: uin >0, iLc >0; uin >0, iLc <0; uin <0, ilc <0; uin <0, ilc >0, uin is the input voltage and iLc is the current of the inductor; the control circuit further comprises a main controller, the main controller detects input voltage and output voltage on a power supply line through a voltage detection device, the main controller is used for controlling the on-off of the first relay, the second relay, the first switch, the second switch, the third switch and the fourth switch, specifically, after the output voltage is subjected to feedback sampling, the output voltage is compared with a reference output voltage signal through the main controller to obtain a high-frequency PWM control signal, and the second switch is subjected to phase inversion to obtain a control signal SN2; after the input voltage is sampled, a low-frequency input voltage polarity signal is generated through the main controller, and a signal SN1 is obtained after the first switch is in phase opposition; the second switch and the SN2 respectively carry out logic or modulation with the first switch and the SN1 to generate control signals K1, K2, K3 and K4 of the first switch, the second switch, the third switch and the fourth switch, and the output voltage Uo is obtained by changing the on time of the switches.
2. The bypass stepless voltage regulating device of claim 1, wherein the first relay is a normally closed relay and the second relay is a normally open relay.
3. The shunt stepless voltage regulating device of claim 1, wherein the first switch, the second switch, the third switch and the fourth switch are all shunt switches.
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| CN201910335796.9A CN110061508B (en) | 2019-04-24 | 2019-04-24 | Bypass stepless voltage regulating device |
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| CN201910335796.9A CN110061508B (en) | 2019-04-24 | 2019-04-24 | Bypass stepless voltage regulating device |
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| CN110061508B true CN110061508B (en) | 2023-10-10 |
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| US7816894B2 (en) * | 2006-06-23 | 2010-10-19 | Electro-Chance, Llc | Method and apparatus for regulating voltage |
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| WO2018126554A1 (en) * | 2017-01-04 | 2018-07-12 | 广东百事泰电子商务股份有限公司 | Smart correction wave voltage conversion circuit based on pfc, full bridge, and half bridge |
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| CN110061508A (en) | 2019-07-26 |
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