CN116633169B - System for supplying power in isolation mode and control method - Google Patents
System for supplying power in isolation mode and control method Download PDFInfo
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- CN116633169B CN116633169B CN202310907055.XA CN202310907055A CN116633169B CN 116633169 B CN116633169 B CN 116633169B CN 202310907055 A CN202310907055 A CN 202310907055A CN 116633169 B CN116633169 B CN 116633169B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002955 isolation Methods 0.000 title abstract description 4
- 238000004804 winding Methods 0.000 claims abstract description 126
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims 3
- 230000008859 change Effects 0.000 abstract description 9
- 238000005070 sampling Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
A system and control method for supplying power in isolation mode relates to the technical field of system for adjusting electric variables. A control method of a system powered in an isolated mode is to control the current and the current change of one side of a second primary winding, and further control the current and the current change of a second secondary winding.
Description
Technical Field
The invention relates to the technical field of systems for adjusting electric variables, in particular to a system for supplying power in an isolated mode and a control method.
Background
Along with the rapid development of LEDs, the application scene of the LEDs is richer, the requirements on the LED driving power supply are higher and higher, in order to improve the universality of the LED driving power supply, the same driving power supply is required to support different LED light sources, a very wide voltage output and current output range is required, the stability and the change continuity of the LED light brightness are difficult to ensure under the condition that the voltage and the current change greatly, meanwhile, a control module for adjusting the voltage output and the current output range of the driving power supply needs a stable power supply, for example, a wireless control module such as WIFI and Bluetooth is difficult to ensure stable power supply.
Disclosure of Invention
In view of at least one of the above problems, the present invention aims to increase the variation range of the output voltage and the output current by controlling the voltage rise and the current rise, and simultaneously provide stable power supply for the control module, and provide a system and a control method for supplying power in an isolated manner.
The technical solution for realizing the purpose of the invention is as follows:
a system for providing power in an isolated manner, comprising: the power factor corrector comprises a rectifier bridge, a transformer, a booster circuit, a capacitor, a diode, an MOS tube, a PFC and a power management chip, wherein alternating current is rectified by the rectifier bridge to form fluctuating direct current, the positive electrode of the fluctuating direct current is filtered, a first primary winding is arranged on a circuit of the positive electrode of the fluctuating direct current, the first transformer is arranged on the basis of the first primary winding, the directions of the two windings of the first primary winding and the first secondary winding in the first transformer are opposite, the first secondary winding is rectified by the diode and filtered and stored by the capacitor to obtain an analog power supply to supply power for the PFC PFC (Power Factor Correction) and the power management chip, the booster circuit is arranged at the output end of the first primary winding, the PFC controls the first MOS tube to boost and buck, and a second primary winding is arranged at the output end of the booster circuit and is based on the second primary windingThe method comprises the steps that a second transformer is arranged, two winding directions of a second primary winding and a second secondary winding in the second transformer are the same, a second MOS tube is arranged at the output end of the second primary winding, a power management chip controls the second MOS tube, and a PFC (power factor corrector) and a power management chip control the output of current and voltage of the second secondary winding; it should be noted that the first secondary winding provides power to the PFC and the power management chip, and the second secondary winding provides a wide voltage or current output, for example, a maximum output voltage U max The output voltage U is U max Ranging from 25% to 100%, e.g. at maximum output current I max As a standard, the output current I is I max Ranging from 10% to 100% or from 0% to 100%; the two windings of the transformer respectively bear different functions, and different insulating wire materials can better meet the specific requirements; the first secondary winding adopts an enameled wire, the power of the PFC and the power management chip is low, the requirement can be met by adopting a low-voltage winding, and the enameled wire has good insulating property and conductive property, and can effectively prevent current leakage and short circuit; the second secondary winding adopts three layers of insulating wires, which have the significance of improving the insulating strength and the reliability of the winding, wherein the three layers of insulating wires are respectively a conductor, an insulating layer, a semiconductor layer, a second layer of insulating layer, a second layer of semiconductor layer and an outer layer of insulating layer from inside to outside; the first primary winding and the second primary winding are three layers of insulated wires.
A control method of a system powered in an isolated manner comprises the following specific steps:
step one, a power management chip collects signals to form control signals; it should be noted that, the specific method for the power management chip to collect the voltage information and the current information of the first secondary winding and the second secondary winding is as follows:
step A1, collecting voltage information: the power management chip converts the voltage signal of the secondary winding into a digital signal through an internal analog converter, then samples the digital signal through an internal voltage sampling circuit, and finally stores the sampling result in an internal register;
step A2, collecting current information: the power management chip detects a current signal of the secondary winding through an internal current detection circuit, converts the current signal into a digital signal through an internal analog converter, and finally stores a sampling result in an internal register;
step A3, processing voltage and current information: the power management chip processes the acquired voltage and current information through an internal algorithm, calculates parameters such as power, electric energy and the like of the secondary winding, and stores the result in an internal register;
step A4, outputting a result: the power management chip outputs the processed result to an external controller through an internal interface so that the controller can perform further processing and control;
the specific method for the power management chip to collect the dimming control signal is as follows:
step B1, selecting a proper dimming control signal input interface, such as PWM, 0-10V, DALI and the like;
step B2, transmitting a dimming control signal to the power management chip through an input interface;
step B3, the power management chip converts the dimming control signal into a digital signal through an internal ADC module; it should be noted that, the ADC module is an analog-digital converter module, which is used for converting an analog signal into a digital signal, and is composed of a sampling circuit and a converting circuit, the sampling circuit is used for sampling the analog signal into discrete signals, the converting circuit is used for converting the discrete signals into the digital signal, the ADC module is used in various electronic devices, such as a data acquisition system, a sensor interface, an audio processing, etc., and common ADC modules include a single channel ADC, a multi-channel ADC, a high-speed ADC, etc.;
step B4, processing the digital signal through an internal processor to obtain corresponding dimming control parameters;
step B5, controlling the current or voltage output by the power management chip according to the dimming control parameter to realize the dimming control of the LED lamp;
step two, the power management chip controls the current change range of the second secondary winding, the power management chip transmits a control signal to the power factor corrector, and the power factor corrector controls the voltage change range of the second secondary winding; it should be noted that, the power management chip directly controls the current variation of the second primary winding through controlling the second MOS tube, and further controls the current variation range of the second secondary winding through the second transformer.
Compared with the prior art, the invention has the beneficial effects that:
(1) Power factor corrector U 1 The booster circuit is controlled to improve the power factor of the circuit, so that the reactive power loss of the whole circuit is reduced; the boost circuit can boost the input voltage to the required output voltage, and in practical application, the circuit can generate a certain reactive power due to the existence of elements such as an inductor, a capacitor and the like, so that the power factor is reduced; power factor corrector U 1 The input current and the input voltage of the circuit are in the same phase through the switching tube of the control circuit, so that the power factor is improved; therefore, the reactive power loss of the whole circuit can be reduced, and the efficiency and stability of the whole circuit are improved; meanwhile, the power factor corrector U 1 The elements in the circuit can be protected, and the service life of the circuit is prolonged;
(2) Power management chip U 2 Control MOS tube Q 2 The effect of (2) is that energy is saved: the power management chip controls the switching state of the MOS tube, so that the on-off of the circuit is controlled, the waste of energy of the circuit in an idle or low-load state is avoided, and the energy-saving effect is realized; the protection circuit: the power management chip monitors parameters such as voltage, current and the like of the circuit, and when the circuit is abnormal, the circuit can be cut off in time to avoid the circuit from being affectedTo failure; stability is enhanced: the power management chip controls the current of the circuit, so that the stability of the circuit is ensured, and the circuit is prevented from being broken down due to overlarge or undershoot of the current; enhancing reliability: the power management chip controls the switching state of the circuit, so that the circuit is prevented from being damaged due to overload or short circuit and the like, and the reliability of the circuit is enhanced; efficiency is improved: the power management chip controls the switching state of the MOS tube, so that the on-off of the circuit is controlled, and the waste of energy of the circuit in an idle or low-load state is avoided, thereby improving the efficiency of the circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a system powered in an isolated manner;
fig. 2 is a flow chart of a control method of a system powered in an isolated manner.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, under the condition of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The present invention will be described in further detail with reference to examples.
Embodiment 1, as shown in fig. 1, a system for supplying power in an isolated manner, comprising: the alternating current is rectified by the rectifier bridge to form fluctuating direct current, the positive electrode of the fluctuating direct current is filtered, a first primary winding is arranged on a circuit of the positive electrode of the fluctuating direct current, a first transformer is arranged on the basis of the first primary winding, the directions of the two windings of the first primary winding and the first secondary winding in the first transformer are opposite, the current direction of the first primary winding and the current direction of the first secondary winding are opposite, the first secondary winding is rectified by the diode, and the filtering and energy storage of the capacitor are performed, obtaining an analog power supply to supply power to a power factor corrector PFC (Power Factor Correction) and a power management chip, wherein the output end of a first primary winding is provided with a booster circuit, the booster circuit is used for controlling a first MOS tube to boost and buck by the power factor corrector PFC, the output end of the booster circuit is provided with a second primary winding, a second transformer is arranged on the basis of the second primary winding, the directions of the two windings of the second primary winding and the second secondary winding in the second transformer are the same, the output end of the second primary winding is provided with a second MOS tube, the power management chip is used for controlling the second MOS tube, and the power factor corrector PFC and the power management chip are used for controlling the output of current and voltage of the second secondary winding; it should be noted that the first secondary winding provides power to the PFC and the power management chip, and the second secondary winding provides a wide voltage or current output, for example, a maximum output voltage U max The output voltage U is U max Ranging from 25% to 100%, e.g. at maximum output current I max As a standard, the output current I isI max Ranging from 10% to 100% or from 0% to 100%; the two windings of the transformer respectively bear different functions, and different insulating wire materials can better meet the specific requirements; the first secondary winding adopts an enameled wire, the power of the PFC and the power management chip is low, the requirement can be met by adopting a low-voltage winding, and the enameled wire has good insulating property and conductive property, and can effectively prevent current leakage and short circuit; the second secondary winding adopts three layers of insulating wires, which have the significance of improving the insulating strength and the reliability of the winding, wherein the three layers of insulating wires are respectively a conductor, an insulating layer, a semiconductor layer, a second layer of insulating layer, a second layer of semiconductor layer and an outer layer of insulating layer from inside to outside; the first primary winding and the second primary winding adopt three layers of insulated wires;
further, the fire wire passes through the fuse F 1 The rear end is connected with the input end of a rectifier bridge, and the rectifier bridge is formed by a first diode D 1 Second diode D 2 Third diode D 3 And a fourth diode D 4 The zero line is connected with the other input end of the rectifier bridge, and the output positive electrode of the rectifier bridge is connected with the first capacitor C 1 A first capacitor C 1 Is grounded at the other end of the first capacitor C 1 The capacitor filters voltage because the voltage and the current are related to each other, and when the capacitor filters the voltage, the capacitor smoothes the voltage waveform, thereby reducing noise and interference of the voltage; through a first capacitor C 1 The filtered current and voltage are fed into the input end of the first primary winding of the first transformer, the first primary winding being in the first transformerIn contrast to the winding of the first secondary winding, it should be noted that the winding of the first primary winding is opposite to the winding of the first secondary winding, so that the output voltage and the input voltage of the transformer are opposite, and thus the voltage rise and fall are realized, specifically, the transformer is used for the voltage rise, voltage fall and isolation application of the transformer, and meanwhile, the leakage magnetic induction of the transformer is reduced, and the efficiency of the transformer is improved; specifically, when the current of the first primary winding increases, the current of the first secondary winding decreases, and when the voltage of the first primary winding increases, the voltage of the first secondary winding decreases, because according to faraday's law of electromagnetic induction, when the current or voltage in the primary winding changes, induced electromotive force is generated in the secondary winding, resulting in opposite changes in the current or voltage in the secondary winding; a fifth diode D is positively connected to the homonymous end of the first secondary winding 5 The first secondary winding of the first transformer is provided with a diode for rectification to convert an alternating current signal into a fluctuating direct current signal, and when the alternating current signal passes through the first secondary winding, the diode only allows current to flow in one direction, so that the alternating current signal is converted into a unidirectional fluctuating direct current signal, and thus, electronic equipment in a circuit can work more stably, and noise and interference in the circuit can be reduced; the fluctuating DC signal on the first secondary winding passes through a third capacitor C 3 Is supplied to the power factor corrector U 1 And a power management chip U 2 Providing a stable current and voltage; the output end of the first primary winding is connected with the input end of the booster circuit, wherein the booster circuit comprises a first inductor L 1 Sixth diode D 6 First MOS tube Q 1 Fourth capacitor C 4 Inductor L 1 The voltage boosting circuit is an important component part in the voltage boosting circuit, can convert input voltage into magnetic field energy and store the magnetic field energy, and when the circuit needs output voltage, the inductor can release the stored energy, so that the purpose of voltage boosting is realized; sixth diode D 6 Limiting current flow in one direction, in the boost circuit, a sixth diode D 6 Is made ofThe energy stored in the inductor is prevented from flowing backwards, so that the stability of output voltage is ensured; power factor corrector U 1 The MOS tube duty ratio is controlled to realize the voltage boosting and the voltage reducing, and the duty ratio (duty cycle) is controlled by a power factor corrector U 1 Control MOS tube Q 1 The ratio of on and off time to cycle time is, in particular, the molecule is the first MOS transistor Q 1 On time, denominator is the first MOS transistor Q 1 The cycle time of the voltage regulator is expressed by percentage, in the boost circuit, the size of the duty ratio determines the size of the output voltage, and when the duty ratio is increased, the output voltage is also increased; conversely, when the duty ratio is reduced, the output voltage is also reduced; fourth capacitor C 4 Is a charge storage element capable of smoothing fluctuation of output voltage, and in a booster circuit, a fourth capacitor C 4 The function of (1) is to smooth the fluctuation of the output voltage, thereby ensuring the stability of the output voltage; power factor corrector U 1 The booster circuit is controlled to improve the power factor of the circuit, so that the reactive power loss of the whole circuit is reduced; the boost circuit can boost the input voltage to the required output voltage, and in practical application, the circuit can generate a certain reactive power due to the existence of elements such as an inductor, a capacitor and the like, so that the power factor is reduced; power factor corrector U 1 The input current and the input voltage of the circuit are in the same phase through the switching tube of the control circuit, so that the power factor is improved; therefore, the reactive power loss of the whole circuit can be reduced, and the efficiency and stability of the whole circuit are improved; meanwhile, the power factor corrector U 1 The elements in the circuit can be protected, and the service life of the circuit is prolonged;
further, the power management chip U 2 Collecting signals to form control signals, and a power management chip U 2 The control signal is obtained through calculation, and then the power factor corrector U is controlled 1 The method comprises the steps of carrying out a first treatment on the surface of the The acquisition signals include a dimming control signal, which refers to a signal for controlling the brightness of the lamp, a voltage signal and a current signal in the circuit, and in the lamp control system, the dimming control signal may be transmitted in different manners, such as wires, wireless signals, DMX (De-Mul)A tipleXer) signal, and the like, the dimming control signal can realize the functions of adjusting, switching, changing color and the like of lamplight, and is widely applied to various occasions such as stages, performances, exhibitions, places of business, families and the like, and common dimming control signals comprise 0-10V, DALI (Digital Addressable Lighti ng In terface), DMX512 and the like; the voltage signals and the current signals in the acquired circuit comprise voltage signals and current signals of a first secondary winding and a second secondary winding;
further, the output end of the boost circuit is connected with the input end of a second primary winding, the same name end of the second primary winding and the second secondary winding is arranged in the second transformer, and a seventh diode D is arranged in the second secondary winding 7 The second secondary winding of the second transformer is provided with a diode for rectification to convert an alternating current signal into a fluctuating direct current signal, and when the alternating current signal passes through the second secondary winding, the diode only allows current to flow in one direction, so that the alternating current signal is converted into a unidirectional fluctuating direct current signal, and thus, electronic equipment in a circuit can work more stably, and noise and interference in the circuit can be reduced; the fluctuating DC signal on the second secondary winding passes through a fifth capacitor C 5 Outputting a fluctuating direct current electric signal as an LED driving power supply;
further, the output end of the second primary winding is connected with the MOS tube Q 2 And MOS tube Q 2 Connected with the ground, the power management chip U 2 Control MOS tube Q 2 It should be noted that, when the MOS transistor Q 2 An output end of the second primary winding is connected with a MOS tube Q by adopting an N-type MOS tube 2 Drain electrode of MOS transistor Q 2 The source electrode of the transistor is grounded; power management chip U 2 Control MOS tube Q 2 The effect of (2) is that energy is saved: the power management chip controls the switching state of the MOS tube, so that the on-off of the circuit is controlled, the waste of energy of the circuit in an idle or low-load state is avoided, and the energy-saving effect is realized; the protection circuit: the power management chip monitors parameters such as voltage, current and the like of the circuit, when the circuit has abnormal conditions, the circuit can be cut off in time,the circuit is prevented from being damaged; stability is enhanced: the power management chip controls the current of the circuit, so that the stability of the circuit is ensured, and the circuit is prevented from being broken down due to overlarge or undershoot of the current; enhancing reliability: the power management chip controls the switching state of the circuit, so that the circuit is prevented from being damaged due to overload or short circuit and the like, and the reliability of the circuit is enhanced; efficiency is improved: the power management chip controls the switching state of the MOS tube, so that the on-off of the circuit is controlled, the waste of energy of the circuit in an idle or low-load state is avoided, and the efficiency of the circuit is improved;
furthermore, a zener diode is arranged between the positive electrode and the negative electrode of the rectifier bridge, and the cathode of the zener diode is connected to the positive electrode output end of the rectifier bridge, and the anode of the zener diode is connected to the negative electrode output end of the rectifier bridge; after the connection, the voltage-stabilizing diode can stabilize the fluctuation direct current output by the rectifier bridge, so that the stability of the output voltage is ensured, when the load current changes, the voltage-stabilizing diode can automatically adjust the voltage to keep the output voltage stable, in addition, the voltage-stabilizing diode can also protect a circuit from being damaged by overvoltage, and the rated voltage of the voltage-stabilizing diode is required to be larger than the maximum voltage output by the rectifier bridge, otherwise, the voltage-stabilizing diode is damaged.
Embodiment 2, as shown in fig. 2, the present invention provides a control method of a system powered in an isolated manner, and specific steps for implementing the method are as follows:
step one, a power management chip collects signals to form control signals;
and step two, the power management chip controls the current variation range of the second secondary winding, and the power management chip transmits a control signal to the power factor corrector, so that the power factor corrector controls the voltage variation range of the second secondary winding.
Step one, a power management chip collects signals to form control signals; the specific method for collecting the voltage information and the current information of the first secondary winding and the second secondary winding by the power management chip is as follows:
step A1, collecting voltage information: the power management chip converts the voltage signal of the secondary winding into a digital signal through an internal analog converter, then samples the digital signal through an internal voltage sampling circuit, and finally stores the sampling result in an internal register;
step A2, collecting current information: the power management chip detects a current signal of the secondary winding through an internal current detection circuit, converts the current signal into a digital signal through an internal analog converter, and finally stores a sampling result in an internal register;
step A3, processing voltage and current information: the power management chip processes the acquired voltage and current information through an internal algorithm, calculates parameters such as power, electric energy and the like of the secondary winding, and stores the result in an internal register;
step A4, outputting a result: the power management chip outputs the processed result to an external controller through an internal interface so that the controller can perform further processing and control;
the specific method for the power management chip to collect the dimming control signal is as follows:
step B1, selecting a proper dimming control signal input interface, such as PWM, 0-10V, DALI and the like;
step B2, transmitting a dimming control signal to the power management chip through an input interface;
step B3, the power management chip converts the dimming control signal into a digital signal through an internal ADC module; it should be noted that, the ADC module is an analog-digital converter module, which is used for converting an analog signal into a digital signal, and is composed of a sampling circuit and a converting circuit, the sampling circuit is used for sampling the analog signal into discrete signals, the converting circuit is used for converting the discrete signals into the digital signal, the ADC module is used in various electronic devices, such as a data acquisition system, a sensor interface, an audio processing, etc., and common ADC modules include a single channel ADC, a multi-channel ADC, a high-speed ADC, etc.;
step B4, processing the digital signal through an internal processor to obtain corresponding dimming control parameters;
step B5, controlling the current or voltage output by the power management chip according to the dimming control parameter to realize the dimming control of the LED lamp;
in order to better realize the purpose of the invention, the second step, the power management chip controls the current change range of the second secondary winding, the power management chip transmits the control signal to the power factor corrector, the power factor corrector controls the voltage change range of the second secondary winding; it should be noted that, the power management chip directly controls the current variation of the second primary winding by controlling the second MOS transistor, and further controls the current variation range of the second secondary winding by the second transformer, and the specific steps are as follows:
step M1, the power management chip acquires signals to form control signals, calculates a current value required by the current of the second primary winding and sends signals to the control circuit;
step M2, after receiving the signal, the control circuit controls the switching state of the second MOS tube, thereby controlling the current change of the second primary winding;
step M3, adjusting the switching state of the second MOS tube, and controlling the current variation range of the second secondary winding through the second transformer to enable the current variation range to reach the required output current;
step M4, the power management chip continuously monitors the output current, and continuously adjusts the switching state of the second MOS tube according to the requirement so as to keep the output current stable;
the power management chip transmits a control signal to the power factor corrector, and the PFC of the power factor corrector controls the booster circuit so as to control the voltage variation range of the second secondary winding; the step of the PFC control boost circuit is as follows:
step N1, filtering the direct-current voltage through a first inductor L1 to obtain smooth fluctuation direct-current voltage;
step N2, converting the fluctuating direct-current voltage into a high-frequency pulse signal by controlling the on and off of the first MOS tube;
step N3, fourth capacitor C 4 Filtering the high-frequency pulse signal;
step N4, the filtered high-frequency pulse signal is input to the second transformer T 2 Through a second transformer T 2 To boost the input voltage to a desired output voltage;
step N5, controlling the on and off of the switching tube through a feedback signal of the output voltage so as to keep the output voltage stable; it should be noted that, the power management chip collects the feedback signal to form a control signal to be transmitted to the power factor corrector;
step N6, adding a power factor corrector PFC in a control circuit of the boost converter, and enabling an input current to be in phase with an input voltage through the on and off of a first MOS tube, so that the power factor of the system is improved;
and step N7, synchronizing the output voltage of the power factor corrector with the output voltage of the boost converter, thereby realizing the synergistic effect of the power factor correction and the boost control.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be included in the scope of the appended claims.
Claims (9)
1. A system for providing power in an isolated manner, comprising: rectifier bridge, transformer, boost circuit, electric capacity, diode, MOS pipe, power factor corrector and power management chip, wherein, the electric capacity includes: a first capacitor, a transformer comprising: a first transformer and a second transformer, the diode comprising: the voltage stabilizing diode and the fifth diode, the MOS pipe includes: the power factor corrector is characterized in that alternating current is rectified by a rectifier bridge to form fluctuating direct current, the positive electrode of the fluctuating direct current is filtered, a first primary winding is arranged on a circuit of the positive electrode of the fluctuating direct current, a first transformer is arranged on the basis of the first primary winding, the directions of the first primary winding and the first secondary winding in the first transformer are opposite, the first secondary winding is rectified by a diode and is filtered and stored by a capacitor to obtain an analog power supply to supply power to the power factor corrector and a power management chip, a booster circuit is arranged at the output end of the first primary winding, the booster circuit comprises a first inductor, a sixth diode, the first MOS tube and a fourth capacitor, the booster circuit is used for controlling the first MOS tube to boost, the output end of the booster circuit is provided with a second primary winding, the second transformer is arranged on the basis of the second primary winding, the second primary winding and the second secondary winding in the second transformer are used for rectifying, the second primary winding and the second secondary winding are in the same direction, the second primary winding and the second secondary winding are used for controlling the power factor of the second MOS tube and the second primary winding is used for controlling the power factor to be output from the second primary winding and the second MOS tube.
2. A system for providing power in an isolated manner as in claim 1, wherein: and a zener diode is arranged between the anode and the cathode of the rectifier bridge.
3. A system for providing power in an isolated manner as in claim 2, wherein: the cathode of the voltage stabilizing diode is connected to the positive electrode output end of the rectifier bridge, and the anode of the voltage stabilizing diode is connected to the negative electrode output end of the rectifier bridge.
4. A system for providing power in an isolated manner as in claim 1, wherein: the first capacitor is arranged at the output end of the rectifier bridge and filters the current rectified by the rectifier bridge.
5. A system for providing power in an isolated manner as in claim 1, wherein: the same-name end of the first secondary winding is connected with a fifth diode.
6. A system for providing power in an isolated manner as in claim 1, wherein: the power management chip collects signals.
7. An isolated power system according to claim 6, wherein: the power management chip controls the grid electrode of the second MOS tube.
8. A method of controlling an isolated power supply system according to any one of claims 1 to 7, wherein: the specific steps for realizing the method are as follows:
step one, a power management chip collects signals to form control signals;
and step two, the power management chip controls the current variation range of the second secondary winding, and the power management chip transmits a control signal to the power factor corrector, so that the power factor corrector controls the voltage variation range of the second secondary winding.
9. The control method according to claim 8, characterized in that: the specific method for the power management chip to collect the voltage information and the current information of the first secondary winding and the second secondary winding is as follows:
step A1, collecting voltage information;
step A2, collecting current information;
step A3, processing the voltage and current information, processing the acquired voltage and current information by the power management chip through an internal algorithm, calculating the power and electric energy parameters of the secondary winding, and storing the result in an internal register;
and A4, outputting a result.
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| CN116633169A (en) | 2023-08-22 |
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