CN114204799A - Digital low-carbon power supply - Google Patents
Digital low-carbon power supply Download PDFInfo
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- CN114204799A CN114204799A CN202111542307.0A CN202111542307A CN114204799A CN 114204799 A CN114204799 A CN 114204799A CN 202111542307 A CN202111542307 A CN 202111542307A CN 114204799 A CN114204799 A CN 114204799A
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- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—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
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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
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost 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
- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a digital low-carbon power supply which comprises an alternating current-direct current conversion module, a PFC circuit module, an LLC circuit module, a transformer, a voltage phase detection circuit, a voltage transformation control module and a rectification circuit, wherein the alternating current-direct current conversion module is connected with the PFC circuit module; boosting the first direct current into a second direct current through a PFC circuit module; the LLC circuit module performs pulse modulation of a resonance mode on the second direct current; the voltage phase detection circuit detects the phase of the input alternating current; the first direct current and the input alternating current are subjected to PFC (power factor correction) same-phase voltage boosting and LLC (logical link control) resonant pulse width modulation control through the transformation control of the transformation controller, and the PFC circuit module and the LLC circuit module are respectively controlled by the same transformation controller, so that the PFC circuit module and the LLC circuit module form an integral circuit, abnormal states are uniformly processed through the transformation controller, and the safety of the integral circuit is improved. The whole circuit is relatively simple, the production cost of the power supply can be reduced, and the maintenance cost is relatively low.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a digital low-carbon power supply.
Background
The switching power supply is a power supply which maintains stable output voltage by controlling the time ratio of the on and off of the switching tube, and the switching power supply works in the on and off states because the switching tube works in the working state, and current flows through the switching tube. Therefore, extra power loss can be generated by the switching tube, and in order to reduce the power loss of the switching tube, an LLC resonant circuit framework can be adopted, so that the switching tube works in a soft-on state. But the pure LLC resonant circuit architecture power factor correction PFC is relatively low. It is difficult to meet the circuit design requirements for high PFC. However, if separate PFC and LLC circuits are used to design the power supply. The two stages of circuits are relatively independent, so that the exception handling between the two stages of circuits is difficult, and the safety of the whole circuit is reduced. And results in very complex and bulky overall circuits. The power supply production cost and the maintenance cost are relatively high.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to provide a digital low-carbon power supply.
To achieve the above object, according to an embodiment of the present invention, a digital low carbon power supply includes:
the alternating current-direct current conversion module is electrically connected with the input alternating current so as to convert the input power supply into a first direct current;
the PFC circuit module is connected with the first direct current output end so as to boost the first direct current into second direct current;
an input end of the LLC circuit module is connected with the second direct current output end of the PFC circuit module so as to perform pulse modulation of the second direct current in a resonance mode;
one end of a primary coil of the transformer is connected with a first direct current output end of the alternating current-direct current conversion module;
the voltage phase detection circuit is connected with the alternating current-direct current conversion module to detect the phase of the input alternating current;
the voltage transformation control module comprises a voltage transformation controller, and the voltage transformation control of the voltage transformation controller is respectively connected with the PFC circuit module, the LLC circuit module and the voltage phase detection circuit so as to carry out PFC in-phase voltage boosting and LLC resonance pulse width modulation control on the first direct current and the input alternating current;
and the rectifying circuit is connected with the secondary coil of the transformer so as to convert the pulse width modulation direct current output by the transformer into stable low-voltage direct current and output the stable low-voltage direct current.
Further, according to an embodiment of the present invention, a digital controller, a PFC driver module and an LLC driver module are disposed in the transformer controller, the digital controller is respectively connected to the PFC driver module and the LLC driver module, the PFC driver module is connected to the PFC circuit module, and the LLC driver module is connected to the LLC circuit module.
Further, according to an embodiment of the present invention, the voltage phase detection circuit includes:
a first diode D11, wherein the anode of the first diode D11 is connected with the AC input end of the AC-DC conversion module;
a first resistor R13, one end of the first resistor R13 being connected to the cathode of the first diode D11;
and a second resistor R30, wherein one end of the second resistor R30 is connected to the other end of the first resistor R13 through a third resistor R23 and a fourth resistor R20, the other end of the second resistor R30 is connected to a reference ground, and the one end of the second resistor R30 is further connected to a phase detection end of the voltage transformation controller.
Further, according to an embodiment of the present invention, the PFC circuit module includes:
a boost inductor L3, wherein one end of the boost inductor L3 is connected to the first DC output end;
a freewheeling diode D2, wherein the anode of the freewheeling diode D2 is connected with the other end of the boosting power supply L3, and the cathode of the freewheeling diode D2 is connected with the input end of the LLC circuit module;
a first switching tube Q1, a drain of the first switching tube Q1 is connected with an anode of the freewheeling diode D2, a source of the first switching tube Q1 is connected with a reference ground, and a gate of the first switching tube Q1 is connected with a PFC control end of the transformer controller;
one end of the voltage stabilizing capacitor CE1 is connected with the cathode of the freewheeling diode D2, and the other end of the voltage stabilizing capacitor CE1 is connected with the reference ground.
Further, according to an embodiment of the present invention, the PFC circuit module further includes:
a charging diode D9, an anode of the charging diode D9 is connected to the other end of the boosting inductor L3, and a cathode of the charging diode D9 is connected to the one end of the voltage-stabilizing capacitor CE 1.
Further, according to an embodiment of the present invention, the PFC circuit module further includes:
a first filter capacitor CBB1, one terminal of the first filter capacitor CBB1 being connected to the one terminal of the boost inductor L3, the other terminal of the first filter capacitor CBB1 being connected to ground;
a second filter capacitor CBB2, wherein one end of the second filter capacitor CBB2 is connected to the other end of the boost inductor L3, and the other end of the second filter capacitor CBB2 is connected to ground.
Further, according to an embodiment of the present invention, the LLC circuit module includes:
a second switching tube Q2, a drain of the second switching tube Q2 is connected to the second dc output terminal of the PFC circuit module, and a gate of the second switching tube Q2 is connected to the first LLC control terminal of the transformer controller;
a third switching tube Q3, wherein the drain of the third switching tube Q3 is connected with the source of the second switching tube Q2, the source of the third switching tube Q3 is connected with the reference ground, and the gate of the third switching tube Q3 is connected with the second LLC control end of the voltage transformation controller;
the drain of the third switching tube Q3 is also connected with one end of the primary coil of the transformer;
and one end of the resonant capacitor C25 is connected with the other end of the primary coil of the transformer, and the other end of the resonant capacitor C25 is connected with the source of the third switching tube Q3.
Further, according to an embodiment of the present invention, the LLC circuit module further includes:
a resonant voltage detection circuit, including a first capacitor C11, a second capacitor C12, and a third resistor R25, wherein one end of the first capacitor C11 is connected to the other end of the primary winding of the transformer, the other end of the first capacitor C11 is connected to one end of the second capacitor C12, the other end of the second capacitor C12 is connected to the reference ground, one end of the third resistor R25 is connected to the one end of the second capacitor C12, the other end of the third resistor R25 is connected to the other end of the second capacitor C12, and the one end of the second capacitor C12 is further connected to a resonant voltage detection end of the transformer controller;
the resonant current detection circuit comprises a third capacitor C20, a fourth resistor R41, a fifth resistor R26 and a fourth capacitor C19, wherein one end of the third capacitor C20 is connected with the other end of the primary coil of the transformer, one end of the fourth resistor R41 is connected with the other end of the third capacitor C20, the other end of the fourth resistor R41 is connected with the reference ground, one end of the fifth resistor R26 is connected with the other end of the third capacitor C20, one end of the fourth capacitor C19 is connected with the other end of the fifth resistor R26, the other end of the fourth capacitor C19 is connected with the reference ground, and the one end of the fourth capacitor C19 is further connected with a resonant current detection end of the transformer controller.
Further, according to an embodiment of the present invention, the digital low carbon power supply further includes:
a voltage detection circuit, which includes a sixth resistor R11 and a seventh resistor R39, wherein one end of the sixth resistor R11 is connected to the second dc output end of the PFC circuit module, the other end of the sixth resistor R11 is connected to one end of the seventh resistor R39 through an eighth resistor R17 and a ninth resistor R28, the other end of the seventh resistor R39 is connected to the reference ground, and the one end of the seventh resistor R39 is further connected to the voltage detection end of the transformer controller;
a current detection circuit comprising a tenth resistor R1 connected in series with a power supply loop of the transformer primary coil; one end of the tenth resistor R1 is connected to one end of the primary coil of the transformer, the other end of the tenth resistor R1 is connected to the ac/dc conversion module, and the other end of the tenth resistor R1 is connected to the current detection end of the transformer controller.
Further, according to an embodiment of the present invention, the rectifier circuit includes:
a rectifying switch tube Q4, wherein the drain of the rectifying switch tube Q4 is connected with one end of the secondary coil of the transformer, and the source of the rectifying switch tube Q4 is connected with the output power interface;
a synchronous rectifier U2, a rectification control end of the synchronous rectifier U2 is connected with the gate of the rectification switch tube Q4, and a synchronous rectification detection end of the synchronous rectifier U2 is connected with the drain of the rectification switch tube Q4;
one end of the fifth capacitor EC1 is connected to the other end of the transformer, and the other end of the fifth capacitor EC1 is connected to the source of the rectifying switch tube Q4.
The digital low-carbon power supply provided by the embodiment of the invention is connected with the first direct current output end through the PFC circuit module so as to boost the first direct current into the second direct current; the input end of the LLC circuit module is connected with the second direct current output end of the PFC circuit module so as to perform pulse modulation of the second direct current in a resonance mode; one end of a primary coil of the transformer is connected with a first direct current output end of the alternating current-direct current conversion module; the voltage phase detection circuit is connected with the alternating current-direct current conversion module to detect the phase of the input alternating current; the voltage transformation control of the voltage transformation controller is respectively connected with the PFC circuit module, the LLC circuit module and the voltage phase detection circuit so as to carry out PFC in-phase voltage boosting and LLC resonance pulse width modulation control on the first direct current and input alternating current. The whole circuit is relatively simple, the production cost of the power supply can be reduced, and the maintenance cost is relatively low.
Drawings
Fig. 1 is a block diagram of a digital low-carbon power supply according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a digital low-carbon power circuit according to an embodiment of the invention;
fig. 3 is a block diagram of a voltage transformation controller according to an embodiment of the present invention.
Reference numerals:
an AC-DC conversion module 10;
a PFC circuit module 20;
an LLC circuit module 30;
a transformer circuit 40;
a rectifying circuit 50;
an auxiliary power supply circuit 60;
a voltage detection circuit 70;
a current detection circuit 80;
a voltage phase detection circuit 90.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, the embodiment of the invention provides a digital low-carbon power supply, which includes an ac/dc conversion module 10, a PFC circuit module 20, an LLC circuit module 30, a transformer, a voltage phase detection circuit 90, a transformation control module, and a rectification circuit 50, wherein the ac/dc conversion module 10 is connected to an input ac power to convert the input power into a first dc power; the power input end of the alternating current-direct current conversion module 10 is used for being connected with alternating current, and the alternating current can be commercial power alternating current; the alternating current of the commercial power is subjected to voltage conversion, so that the alternating current of the commercial power is converted into low-voltage direct current to supply power for the electronic equipment.
The PFC circuit module 20 is connected to the first direct current output terminal to boost the first direct current into a second direct current; because the boost circuit has better PFC characteristic, the PFC value can be well improved, and the current-voltage phase of the power circuit is close to that of the input power. So that the PFC value of the power supply circuit can reach the specified requirement.
The input end of the LLC circuit module 30 is connected to the second dc output end of the PFC circuit module 20, so as to perform pulse modulation of the second dc in a resonant mode; after the first dc power is boosted to the second dc power by the PFC circuit module 20, both the first dc power and the second dc power are higher-voltage dc power. And outputting low-voltage direct current to provide low-voltage power supply for the electronic equipment. And transforming the second direct current into low-voltage direct current and outputting the low-voltage direct current. In the embodiment of the present invention, the LLC circuit module 30 is used to perform pulse width modulation on the second direct current, the LLC circuit is an inductor and capacitor resonant circuit, and soft start of the switching tube can be achieved through the resonance effect of the LLC circuit. Therefore, the loss of extra power supply of the switching tube in the working process can be reduced, and the conversion efficiency of the whole power supply circuit is higher.
One end of the primary coil of the transformer is connected with the first dc output end of the ac-dc conversion module 10; the primary coil of the transformer is charged and discharged under the action of the LLC circuit module 30. In operation, the resonant inductor and the capacitor on the LLC circuit module 30 may form a resonant circuit, and at the same time, the circuit in the primary coil is transferred to the secondary coil by electromagnetic induction.
The voltage phase detection circuit 90 is connected to the ac-dc conversion module 10 to perform phase detection on the input ac power; the voltage phase detection circuit 90 can obtain the voltage value of the input ac power and output the voltage value to the voltage transformation control module.
The transformation control module comprises a transformation controller, and transformation control of the transformation controller is respectively connected with the PFC circuit module 20, the LLC circuit module 30 and the voltage phase detection circuit 90 so as to carry out PFC in-phase boosting and LLC resonant pulse width modulation control on the first direct current and the input alternating current; the voltage transformation controller may obtain a voltage value of the input ac power through the voltage phase detection circuit 90, and may obtain a phase of the input ac power through the voltage value. And performs PFC in-phase boost modulation control on the PFC circuit module 20 according to the obtained phase relationship of the input ac power. And simultaneously, modulating the second direct current output by the PFC circuit module 20 into a pulsating power supply signal through the LLC circuit module 30 by controlling the LLC resonant pulse width modulation. Thus, the voltage can be combined by the transformer and then output through the secondary coil of the transformer.
The rectifying circuit 50 is connected to the secondary winding of the transformer to convert the pulse width modulated dc power output by the transformer into a stable low voltage dc power and output the converted dc power. Because the direct current output by the secondary coil is pulsating direct current, the direct current is further required to be rectified and filtered into voltage-stabilizing direct current through a rectifying and filtering circuit and then is output externally to supply power for connected electronic equipment.
The digital low-carbon power supply provided by the embodiment of the invention is connected with the first direct current output end through the PFC circuit module 20 so as to boost the first direct current into a second direct current; an input end of the LLC circuit module 30 is connected to the second dc output end of the PFC circuit module 20, so as to perform pulse modulation of the second dc in a resonant mode; one end of the primary coil of the transformer is connected with the first dc output end of the ac-dc conversion module 10; the voltage phase detection circuit 90 is connected with the ac-dc conversion module 10 to perform phase detection on the input ac power; the transformation control of the transformation controller is respectively connected with the PFC circuit module 20, the LLC circuit module 30 and the voltage phase detection circuit 90 so as to carry out PFC in-phase boosting and LLC resonant pulse width modulation control on the first direct current and the input alternating current, and because the same transformation controller is adopted to respectively control the PFC circuit module 20 and the LLC circuit module 30, the PFC circuit module 20 and the LLC circuit module 30 form an integral circuit, and the abnormal state is uniformly processed through the transformation controller, so that the safety of the integral circuit is improved. The whole circuit is relatively simple, the production cost of the power supply can be reduced, and the maintenance cost is relatively low.
Referring to fig. 3, a digital controller, a PFC driver module and an LLC driver module are disposed in the voltage transformation controller, the digital controller is respectively connected to the PFC driver module and the LLC driver module, the PFC driver module is connected to the PFC circuit module 20, and the LLC driver module is connected to the LLC circuit module 30. The digital controller is a control center, and is used for respectively collecting signals of voltage and current of the power circuit, and outputting a PWM control signal to the PFC driving module and the LLC driving module according to the collected voltage and current signals, and the PFC driving module and the LLC driving module respectively drive the PFC circuit module 20 and the LLC circuit module 30 to perform voltage conversion. Because the same transformation controller is adopted to respectively control the PFC circuit module 20 and the LLC circuit module 30, the PFC circuit module 20 and the LLC circuit module 30 form an integral circuit, abnormal states are uniformly processed through the transformation controller U1, and the safety of the integral circuit is improved. The whole circuit is relatively simple, the production cost of the power supply can be reduced, and the maintenance cost is relatively low.
Referring to fig. 2, the voltage phase detection circuit 90 includes: a first diode D11, a first resistor R13 and a second resistor R30, wherein the anode of the first diode D11 is connected with the AC input end of the AC-DC conversion module 10; one end of the first resistor R13 is connected with the cathode of the first diode D11; one end of the second resistor R30 is connected to the other end of the first resistor R13 through a third resistor R23 and a fourth resistor R20, the other end of the second resistor R30 is connected to a reference ground, and the one end of the second resistor R30 is further connected to a phase detection end of the transformer controller U1. The input alternating current can be rectified into pulsating direct current through the first diode D11 and output. The pulsating direct current rectified and output by the first diode D11 is divided by the first resistor R13 and the second resistor R30, so that the voltage value meets the sampling range of the transformer controller U1 and is output to the phase detection end of the transformer controller U1. The voltage transformation controller U1 can detect the phase of the input alternating current through the voltage value. And performs PFC in-phase boost modulation control on the PFC circuit module 20 according to the obtained phase relationship of the input ac power. The current and voltage of the PFC circuit module 20 are in phase with the input power, so as to provide the PFC value of the whole circuit, and less noise signals generated by the power circuit enter the power grid providing the alternating current, thereby reducing noise pollution to the power grid.
Referring to fig. 2, the PFC circuit module 20 includes: the boost converter comprises a boost inductor L3, a freewheeling diode D2, a first switching tube Q1 and a voltage-stabilizing capacitor CE1, wherein one end of the boost inductor L3 is connected with the first direct-current output end; the anode of the freewheeling diode D2 is connected to the other end of the boosting power supply L3, and the cathode of the freewheeling diode D2 is connected to the input end of the LLC circuit module 30; the drain of the first switch tube Q1 is connected with the anode of the freewheeling diode D2, the source of the first switch tube Q1 is connected with the reference ground, and the gate of the first switch tube Q1 is connected with the PFC control end of the voltage transformation controller; one end of the voltage-stabilizing capacitor CE1 is connected to the cathode of the freewheeling diode D2, and the other end of the voltage-stabilizing capacitor CE1 is connected to the reference ground. The boosting inductor L3, the freewheeling diode D2, the first switching tube Q1 and the voltage-stabilizing capacitor CE1 form a boosting circuit to provide the PFC value of the power circuit. The working process comprises the following steps: the voltage transformation controller U1 obtains the phase of the input ac power through the voltage phase detection circuit 90, and outputs a PWM pulse modulation signal to the gate of the first switch Q1 according to the phase of the input ac power, so as to drive the conduction or the cut-off between the source and the drain of the first switch Q1. When the source and the drain of the first switch Q1 are turned on, the dc power output by the ac-dc converter circuit 10 charges the boost inductor L3. A charging current is generated across the boost inductor L3. After the boost inductor L3 is charged to a certain current amount, the voltage transformation controller U1 controls the first switching tube Q1 to be turned off, the voltage across the boost inductor L3 changes abruptly, and the freewheeling diode D2 is turned on, and the boost inductor L3 charges the voltage-stabilizing capacitor CE1 through the freewheeling diode D2. During the continuous PWM pulse modulation signal, the voltage of the voltage regulating capacitor CE1 rises to the set voltage value. In the process, the transformation controller U1 controls the on/off of the first switching tube Q1 according to the phase relation of the input alternating current, so as to ensure that the current phase of the boost inductor L3 is consistent with the phase of the input alternating current, thereby achieving a high PFC value. Two ends of the voltage-stabilizing capacitor CE1 can also be connected in parallel with a filter capacitor C2, and the high-frequency interference pulse signals can be filtered through the filter capacitor, so that the stability of the second direct current is ensured.
The PFC circuit module 20 further includes: a charging diode D9, an anode of the charging diode D9 is connected to the other end of the boosting inductor L3, and a cathode of the charging diode D9 is connected to the one end of the voltage-stabilizing capacitor CE 1. The voltage-stabilizing capacitor CE1 can be charged by the charging diode D9. In an embodiment of the present invention, a transformer T1 is further disposed between the freewheeling diode D2 and the voltage-stabilizing capacitor CE 1. When the switch of the charging diode D9 starts to work, the voltage-stabilizing capacitor CE1 is charged, and the transformer T1 is prevented from being in a full magnet state.
The PFC circuit module 20 further includes: a first filter capacitor CBB1 and a second filter capacitor CBB2, one end of the first filter capacitor CBB1 is connected to the one end of the boost inductor L3, and the other end of the first filter capacitor CBB1 is connected to a reference ground; one end of the second filter capacitor CBB2 is connected to the other end of the boost inductor L3, and the other end of the second filter capacitor CBB2 is connected to ground. Part of noise waves can be filtered through the first filter capacitor CBB1 and the second filter capacitor CBB2, and the stability of the power supply circuit is guaranteed.
Referring to fig. 2, the LLC circuit module 30 includes: a second switching tube Q2, a third switching tube Q3, and a resonant capacitor C25, wherein a drain of the second switching tube Q2 is connected to the second dc power output terminal of the PFC circuit module 20, and a gate of the second switching tube Q2 is connected to the first LLC control terminal of the transformer controller; the drain of the third switching tube Q3 is connected with the source of the second switching tube Q2, the source of the third switching tube Q3 is connected with the reference ground, and the gate of the third switching tube Q3 is connected with the second LLC control end of the transformation controller; the drain of the third switching tube Q3 is also connected with one end of the primary coil of the transformer; one end of the resonant capacitor C25 is connected to the other end of the primary winding of the transformer, and the other end of the resonant capacitor C25 is connected to the source of the third switching tube Q3. A current type LLC resonance circuit is formed among the second switching tube Q2, the third switching tube Q3, the resonance capacitor C25 and the primary coil of the transformer T2 of the transformer. In normal operation, the transformer controller U1 outputs complementary PWM pulse modulation signals to the gates of the second Q2 and the third Q3. The second switch tube Q2 and the third switch tube Q3 are conducted with each other, and the resonant capacitor C25 and the primary coil of the transformer are charged with each other to form an LLC resonant circuit. The LLC circuit module 30 further includes a resonant voltage detection circuit 70 and a resonant current detection circuit 80, the resonant voltage detection circuit 70 includes a first capacitor C11, a second capacitor C12, and a third resistor R25, one end of the first capacitor C11 is connected to the other end of the primary coil of the transformer, the other end of the first capacitor C11 is connected to one end of the second capacitor C12, the other end of the second capacitor C12 is connected to the reference ground, one end of the third resistor R25 is connected to the one end of the second capacitor C12, the other end of the third resistor R25 is connected to the other end of the second capacitor C12, and the one end of the second capacitor C12 is further connected to a resonant voltage detection end of the transformer controller; the resonant current detection circuit 80 includes a third capacitor C20, a fourth resistor R41, a fifth resistor R26, and a fourth capacitor C19, one end of the third capacitor C20 is connected to the other end of the primary winding of the transformer, one end of the fourth resistor R41 is connected to the other end of the third capacitor C20, the other end of the fourth resistor R41 is connected to the reference ground, one end of the fifth resistor R26 is connected to the other end of the third capacitor C20, one end of the fourth capacitor C19 is connected to the other end of the fifth resistor R26, the other end of the fourth capacitor C19 is connected to the reference ground, and the one end of the fourth capacitor C19 is further connected to the resonant current detection end of the transformer controller. The transformation controller U1 obtains the resonance state of the LLC circuit module 30 through the resonance voltage detection circuit 70 and the resonance current detection circuit 80, and controls the on/off of the second switching tube Q2 and the third switching tube Q3 according to the resonance state, so as to realize soft switching of the second switching tube Q2 and the third switching tube Q3, reduce the power loss of the second switching tube Q2 and the third switching tube Q3, and improve the conversion efficiency of the power supply circuit.
Referring to fig. 2, the digital low carbon power supply further includes: a voltage detection circuit 70 and a current detection circuit 80, wherein the voltage detection circuit 70 includes a sixth resistor R11 and a seventh resistor R39, one end of the sixth resistor R11 is connected to the second dc output terminal of the PFC circuit module 20, the other end of the sixth resistor R11 is connected to one end of the seventh resistor R39 through an eighth resistor R17 and a ninth resistor R28, the other end of the seventh resistor R39 is connected to the reference ground, and the one end of the seventh resistor R39 is further connected to the voltage detection terminal of the transformer controller U1; the second direct current is divided by the sixth resistor R11 and the seventh resistor R39 and then output to the voltage detection end of the transformer controller U1, so that the voltage of the second direct current is detected by the transformer controller U1.
The current detection circuit 80 comprises a tenth resistor R1 connected in series with the power supply loop of the primary coil of the transformer; one end of the tenth resistor R1 is connected to one end of the primary coil of the transformer, the other end of the tenth resistor R1 is connected to the ac/dc conversion module 10, and the other end of the tenth resistor R1 is connected to the current detection end of the transformer controller. The current value of the primary coil of the transformer T2 is collected through the tenth resistor R1 and output to the current detection end of the transformation controller U1, so that the current value of the primary coil of the transformer T2 is detected through the transformation controller U1. After the transformation controller U1 passes through the current value and the voltage value of the primary coil of the transformer, overcurrent and overvoltage protection can be carried out. Or by adjusting the PWM pulse width to regulate the output voltage.
Referring to fig. 2, the rectifier circuit 50 includes: the rectifier switch tube Q4, the synchronous rectifier U2 and the fifth capacitor EC1, the drain electrode of the rectifier switch tube Q4 is connected with one end of the secondary coil of the transformer, and the source electrode of the rectifier switch tube Q4 is connected with the output power interface; the rectifier switch tube Q4 is connected in series on the output loop of the low-voltage direct current to rectify and output the pulsating direct current of the secondary coil of the transformer, so that current backflow is avoided.
A rectification control end G1 of the synchronous rectifier U2 is connected with the gate of the rectification switching tube Q4, and a synchronous rectification detection end VD2 of the synchronous rectifier U2 is connected with the drain of the rectification switching tube Q4; since the synchronous rectification detection terminal of the synchronous rectifier U2 is connected to one terminal of the secondary coil of the transformer. In this way, the voltage of the secondary coil of the transformer can be detected, and the rectification control of the rectification switching tube Q4 can be performed by outputting a control signal through the rectification control terminal G1 of the synchronous rectifier U4.
One end of the fifth capacitor EC1 is connected to the other end of the transformer, and the other end of the fifth capacitor EC1 is connected to the source of the rectifying switch tube Q4. The fifth capacitor EC1 can stabilize and filter the pulsating direct current output by the rectifier switching tube Q4 to output a stable low-voltage direct current, so as to supply power to the rear-end electronic equipment.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024138374A1 (en) * | 2022-12-27 | 2024-07-04 | 深圳市显盈科技股份有限公司 | Voltage conversion circuit and docking station |
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