CN210518114U - Integrated PFC high-voltage half-bridge resonance synchronous rectification AC/DC power module - Google Patents
Integrated PFC high-voltage half-bridge resonance synchronous rectification AC/DC power module Download PDFInfo
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- CN210518114U CN210518114U CN201921676106.8U CN201921676106U CN210518114U CN 210518114 U CN210518114 U CN 210518114U CN 201921676106 U CN201921676106 U CN 201921676106U CN 210518114 U CN210518114 U CN 210518114U
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- 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
An integrated PFC high-voltage half-bridge resonance synchronous rectification AC/DC power module relates to a power supply. The power supply integrates an input anti-interference and rectification filter circuit, a Power Factor Correction (PFC) and control circuit, an LLC high-voltage half-bridge resonance and control circuit, a synchronous rectification quick-disconnection intelligent control circuit, a voltage detection system reset IC circuit, a feedback and protection circuit, an output voltage stabilizing circuit and an output filter circuit into a brand-new modular design, and perfectly realizes the brand-new modular AC/DC and DC/DC secondary conversion by mutually matching. The problems of backward circuit technology, large volume, low conversion efficiency, poor electromagnetic compatibility and the like are solved, and the economic benefit is improved while the production cost is reduced.
Description
Technical Field
The utility model relates to a power, in particular to integrated PFC high pressure half-bridge resonance synchronous rectification AC/DC power module.
Background
Generally, a standard AC/DC power supply has two connection modes, one is that voltage is transformed by a power frequency transformer, and then transformed into required voltage (see fig. 1) by a rectification filter circuit and a voltage stabilizing circuit, that is, the input AC voltage is reduced by a transformer T1, and then rectified by a rectifier bridge BR1, a filter capacitor C1 and a filter capacitor C2, and then connected to the input end of a three-terminal regulator, and the output end of the three-terminal regulator is connected to a sampling circuit and an output filter circuit, so as to finally obtain the required DC voltage. The other is that the alternating voltage is directly rectified by a rectifier bridge, filtered and changed into the required voltage by a DC/DC converter (see figure 2), and a plurality of parallel connection modes are adopted to solve the problem when the output power is high. However, these circuits have the defects of backward circuit technology, large volume, more peripheral components, low conversion efficiency, poor electromagnetic compatibility, high cost and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an integrated PFC high pressure half-bridge resonance synchronous rectification AC/DC power module.
The utility model adopts the technical proposal that: the utility model provides an integrated PFC high pressure half-bridge resonance synchronous rectification AC/DC power module, mainly by feedback and protection circuit, output voltage stabilizing circuit and output filter circuit constitute which characterized in that: the device also comprises an input anti-interference and rectification filter circuit, a power factor correction and control circuit, an LLC high-voltage half-bridge resonance and control circuit, a synchronous rectification fast-disconnection intelligent control circuit and a voltage detection system reset IC controller; the technical key points are as follows:
in the above scheme, the input anti-jamming circuit and the rectifying and filtering circuit include a first fuse, a second fuse, a third inductor, a fourth inductor, an eighteenth resistor, a nineteenth resistor, a ninth capacitor, a tenth capacitor, a fifth common mode inductor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a sixth common mode inductor, a twentieth voltage dependent resistor, a bridge rectifier circuit, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, and a seventeenth capacitor, the first fuse and the second fuse are connected to an input end of the anti-jamming circuit, the other end of the second fuse is connected to one end of the third inductor, and the other end of the third inductor is connected to one end of the eighteenth resistor, one end of the tenth capacitor, and one input end of the fifth common mode inductor; the other end of the first fuse is connected with one end of a fourth inductor, the other end of the fourth inductor is connected with one end of a nineteenth resistor, one end of a ninth capacitor and the other end of the ninth capacitor, and is grounded, the other end of a tenth capacitor is connected with the other input end of the fifth common mode inductor, and the other end of the nineteenth resistor is connected with the other end of an eighteenth resistor; one output end of the fifth common-mode inductor is connected with one end of a twelfth capacitor, one end of an eleventh capacitor and one input end of a sixth common-mode inductor, the other end of the eleventh capacitor is grounded, the other output end of the fifth common-mode inductor is connected with the other input end of the sixth common-mode inductor, one end of a thirteenth capacitor and the other end of the twelfth capacitor, the other end of the thirteenth capacitor is grounded, one output end of the sixth common-mode inductor is connected with one end of a twentieth piezoresistor and one end 1 of a bridge rectifier circuit, and the other output end of the sixth common-mode inductor is connected with the other end of the twentieth piezoresistor and one end 3 of the bridge rectifier; and the 4 end of the bridge rectifier circuit is connected with one end of a fifteenth capacitor, one end of a fourteenth capacitor and one end of a seventeenth capacitor and is grounded, the 2 end of the bridge rectifier circuit is connected with the other end of the fourteenth capacitor and one end of a sixteenth capacitor, and the other end of the sixteenth capacitor is connected with the other end of the seventeenth capacitor.
In the above scheme, the power factor correction and control circuit includes a first diode, a second diode, a third diode, a fourth diode, a first inductor, a first capacitor, a second electrolytic capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first switch tube and a PFC controller, wherein a drain of the first switch tube and one end of the first capacitor are further connected between the other end of the first inductor and an anode of the fourth diode, the other end of the first capacitor is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to a source of the first switch tube and one end of the third resistor, and the other end of the third resistor is connected to a gate of the first switch tube; the grid of the first switch tube is connected with the IC8 pin of the PFC controller, the other end of the second electrolytic capacitor is connected with the cathode of the third diode, the cathode of the fourth diode and one end of the fifth resistor, the other end of the fifth resistor is connected with the IC6 pin of the PFC controller, one end of the sixth resistor and one end of the third capacitor, the cathode of the first diode and the cathode of the second diode are connected and then connected with one end of the seventh resistor, the other end of the seventh resistor is connected with the IC5 pin of the PFC controller, one end of the eighth resistor is connected with one end of the fourth capacitor, the other end of the sixth resistor, the other end of the third capacitor, the other end of the fourth capacitor and the other end of the eighth resistor are connected and then connected with the other end of the second resistor, the other end of the third resistor and one end of the fourth resistor, the other end of the fourth resistor is grounded, and an IC2 pin of the PFC controller is connected with the high-voltage resonance controller.
In the above scheme, the LLC high-voltage half-bridge resonance and control circuit includes a ninth resistor, a tenth resistor, a fifth capacitor, a sixth capacitor, a second switch tube, a third switch tube, a transformer, a second inductor and a resonance controller, an IC2 pin of the PFC controller is connected to one end of the fifth capacitor and one end of the ninth resistor, the other end of the ninth resistor is connected to the other end of the fifth capacitor and one end of the tenth resistor and then to an IC7 pin of the resonance controller, an IC15 pin of the resonance controller is connected to a gate of the second switch tube, a drain of the second switch tube is connected to the other end of the tenth resistor, a source of the second switch tube is connected to one end of the second inductor and a drain of the third switch tube, a gate of the third switch tube is connected to an IC11 pin of the resonance controller, the other end of the second inductor is connected to one end of the primary coil of the transformer, and the other end of the primary coil of the transformer is connected to one end of the sixth capacitor, the other end of the sixth capacitor is connected with the source electrode of the third switching tube and then grounded.
In the above scheme, the synchronous rectification fast-disconnection intelligent control circuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a fourth switch tube, a fifth switch tube, a seventh capacitor, an eighth capacitor and a fast-disconnection intelligent controller, one end of a secondary coil of a transformer is connected with one end of the seventh capacitor, a drain electrode of the fourth switch tube, one end of the seventh capacitor and one end of the eleventh resistor, a gate of the fourth switch tube is connected with one end of the twelfth resistor and an IC8 pin of the fast-disconnection intelligent controller, a source of the fourth switch tube is connected with one end of the thirteenth resistor and then connected with IC2 and IC5 pins of the fast-disconnection intelligent controller, the other end of the eleventh resistor is connected with an IC6 pin of the fast-disconnection intelligent controller, and the IC4 pin of the fast-disconnection intelligent controller is connected with one end of the fourteenth resistor, the other end of the fourteenth resistor is connected with the other end of the secondary coil of the transformer T1, one end of the eighth capacitor and the drain of the fifth switch tube, the other end of the eighth capacitor is connected with one end of the fifteenth resistor, the other end of the fifteenth resistor is connected with the source of the fifth switch tube, one end of the seventeenth resistor and one end of the sixteenth resistor, the other end of the sixteenth resistor is connected with the grid of the fifth switch tube, the other end of the seventeenth resistor is grounded, and the IC1 pin of the quick-disconnection intelligent controller is connected with the grid of the fifth switch tube.
The utility model has the advantages that: the utility model discloses this integrated PFC high pressure half-bridge resonance synchronous rectification AC/DC power module, anti-interference and rectification filter circuit will be inputed, Power Factor Correction (PFC) and control circuit, LLC high pressure half-bridge resonance and control circuit, the quick disconnected intelligent control circuit of synchronous rectification, voltage detection system resets IC circuit, feedback and protection circuit, the brand-new modular design of output voltage stabilizing circuit and the integrated integration of output filter circuit, mutually support perfect realization brand-new modular AC/DC, DC/DC's secondary transform. The problems of backward circuit technology, large volume, low conversion efficiency, poor electromagnetic compatibility and the like are solved, and the economic benefit is improved while the production cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a standard AC/DC power conversion circuit formed by transforming voltage through a transformer in an embodiment of the present invention;
FIG. 2 shows a standard AC/DC power conversion by high voltage DC/DC modules according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an integrated PFC high-voltage half-bridge resonant synchronous rectification AC/DC power supply module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an input anti-interference and rectifying filter circuit in an embodiment of the present invention;
the numbers in the figure illustrate the following: the circuit comprises an input anti-interference and rectification filter circuit 1, a power factor correction and control circuit 2, an LLC high-voltage half-bridge resonance and control circuit 3, a synchronous rectification quick-disconnection intelligent control circuit 4, a voltage detection system reset IC controller 5, a feedback and protection circuit 6, an output voltage stabilizing circuit 7 and an output filter circuit 8.
Detailed Description
The above objects, features and advantages of the present invention will be more clearly understood and the present invention will be explained in more detail with reference to the accompanying drawings 1 to 4 and the detailed description thereof.
The integrated PFC high-voltage half-bridge resonant synchronous rectification AC/DC power module adopted in this embodiment includes an input anti-jamming circuit and a rectification filter circuit 1, a Power Factor Correction (PFC) and control circuit 2, an LLC high-voltage half-bridge resonant and control circuit 3, a synchronous rectification fast-off intelligent control circuit 4, a voltage detection system reset IC controller 5, a feedback and protection circuit 6, an output voltage stabilizing circuit 7, and an output filter circuit 8, which are connected in sequence, where the feedback and protection circuit 6, the output voltage stabilizing circuit 7, and the output filter circuit 8 are all existing circuits and are not introduced herein too much. The following mainly explains the circuit with the improvement.
The input anti-interference and rectifying filter circuit 1 adopted in this embodiment connects the fuse FS1 and the fuse FS2 to the input end of the anti-interference circuit, that is, one end of the fuse FS2 is connected to the ACN input end, and one end of the fuse FS1 is connected to the ACL input end, so as to protect the whole module. The other end of the fuse FS2 is connected to one end of an inductor L3, and the other end of the inductor L3 is connected to one end of a resistor R18, one end of a capacitor C10, and one input end of a common mode inductor L5. The other end of the fuse FS1 is connected to one end of an inductor L4, the other end of the inductor L4 is connected to one end of a resistor R19, one end of a capacitor C9, the other end of a capacitor C10 and the other input end of a common mode inductor L5, the other end of the capacitor C9 is grounded, and the other end of the resistor R19 is connected to the other end of a resistor R18. An output end of the common mode inductor L5 is connected with one end of a capacitor C12, one end of a capacitor C11 and one input end of a common mode inductor L6, the other end of the capacitor C11 is grounded, the other output end of the common mode inductor L5 is connected with the other input end of a common mode inductor L6, one end of a capacitor C13 and the other end of a capacitor C12 are connected, the other end of a capacitor C13 is grounded, one output end of the common mode inductor L6 is connected with one end of a piezoresistor R20 and one end of a bridge rectifier circuit 1, and the other output end of the common mode inductor L6 is connected with the other end of a piezoresistor R20 and the other. The 4 terminal of the bridge rectifier circuit is connected to one terminal of the capacitor C15, one terminal of the capacitor C14, and one terminal of the capacitor C17, and grounded, the 2 terminal of the bridge rectifier circuit is connected to the other terminal of the capacitor C14 and one terminal of the capacitor C16, and the other terminal of the capacitor C16 is connected to the other terminal of the capacitor C17.
The input anti-interference circuit adopts a multi-stage LC and pi-type filter circuit to deal with interference and electromagnetic interference of different frequencies, the input anti-interference circuit is connected with the input end of the power factor correction and control circuit 2 after passing through the rectifying filter circuit, the power factor correction and control circuit 2 adopts a Boost type (Boost) circuit design, a rectifying circuit and a large filter capacitor are divided, and input current tracks the change of input voltage by controlling the conduction of a PFC switch tube Q1, so that an ideal power factor is obtained, the electromagnetic interference EMI is reduced, and the working voltage of the switch tube is stabilized. The model of the PFC controller used in this embodiment is ICE3PCS03G, and the power factor correction and control circuit of this embodiment is further described in detail below:
the 2 terminal of the bridge rectifier circuit D5 is further connected to the anode of the diode D3 and one terminal of the inductor L1, the other terminal of the inductor L1 is connected to the anode of the diode D4, and the cathode of the diode D3 and the cathode of the diode D4 are connected together.
An output terminal of the common mode inductor L6 is connected to the anode of the diode D2, and the other output terminal of the common mode inductor L6 is connected to the anode of the diode D1. The cathode of the diode D1 is connected to the cathode of the diode D2.
The drain of the switching tube Q1 and one end of the capacitor C1 are further connected between the other end of the inductor L1 and the anode of the diode D4, the other end of the capacitor C1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the source of the switching tube Q1 and one end of the resistor R3, and the other end of the resistor R3 is connected with the gate of the switching tube Q1. The gate of the switching tube Q1 is connected with a pin of an IC8 of a PFC controller, the other end of an electrolytic capacitor C2 is connected with a cathode of a diode D3, a cathode of a diode D4 and one end of a resistor R5, the other end of a resistor R5 is connected with a pin of an IC6 of the PFC controller, one end of a resistor R6 and one end of a capacitor C3, a cathode of a diode D1 and a cathode of a diode D2 are connected and then connected with one end of a resistor R7, the other end of a resistor R7 is connected with a pin of an IC5 of the PFC controller, one end of a resistor R8 and one end of a capacitor C4, the other end of a resistor R6, the other end of a capacitor C3, the other end of a capacitor C4 and the other end of a resistor R8 are connected and then connected with the other end of a pin of a resistor R2, the other end of a resistor R. And an IC2 pin of the PFC controller is connected with the high-voltage resonance controller.
The working process is as follows: when the switching tube Q1 is turned on, the current IL1 flows through the inductor L1, the current increases linearly before the inductor L1 is not saturated, the electric energy is stored in the inductor L1 in the form of magnetic energy, and at this time, the capacitor C2 discharges to provide energy for the load; when the switching tube Q1 is turned off, a self-induced electromotive force VL1 is generated across the inductor L1 to keep the current direction unchanged, so that VL1 is connected in series with the power source VIN to supply power to the capacitor and the load. The diode D3 used in this embodiment has very important functions, including:
1, the impact of surge voltage on a capacitor is reduced, and the PFC inductance coil L1 is limited to generate huge self-induced electromotive force due to surge current at the moment of starting up, so that circuit faults are caused. The random instantaneous value of the alternating current sine wave can be applied to the inductance coil L1 at each power switch on moment, if the voltage applied to the inductance is near the peak point of the maximum value of the sine wave at the power switch on moment, a sudden change of voltage can be applied to the inductance, a great self-induced electromotive force can be generated on the inductance coil L1, the electromotive force is more than twice of the applied voltage, a large current is formed to charge a subsequent capacitor, the fuse of an input circuit is blown when the voltage is light, and the filter capacitor and the switching tube Q1 are broken when the voltage is heavy. After the protection diode D3 is arranged, at the moment of switching on the power supply, the D3 is conducted and charges the C2, so that the current flowing through the PFC inductance coil L1 is greatly reduced, the generated self-induced electromotive force is much smaller, and the damage to a filter capacitor and a switching tube and the fusing of a fuse are much smaller.
2, the surge voltage impact on the boost diode D4 is reduced, and the diode shunts a part of the current of the branch of the PFC inductor L1 and the boost diode D4, so that the boost diode D4 can be protected.
3 the resistor R1, the resistor R2 and the capacitor C1 form a switch tube Q1 peak eliminating circuit to absorb the DS peak of the switch tube. The resistor R5, the resistor R6 and the capacitor C3 form a main voltage detection circuit, and when the voltage of a detection pin is lower than 0.5V, a Power Factor Correction (PFC) controller enters an open-loop protection state to cut off the output power. The resistor R7, the resistor R8 and the capacitor C4 form a power-down protection circuit, and when the voltage of a detection pin is lower than 1V, the Power Factor Correction (PFC) controller enables the driving program of an inner door of the PFC controller to be closed to enter a power-down protection state. The capacitor C3 and the capacitor C4 are noise bypass capacitors, and in addition, the capacitor C3 and the capacitor C4 also have the functions of overcurrent and overvoltage protection, and the capacitor C3 and the capacitor C4 work in a continuous working mode by utilizing an advanced Power Factor Correction (PFC) controller, so that the high-efficiency, safe and reliable operation in the whole load range is ensured.
The LLC high-voltage half-bridge resonance and control circuit in this embodiment, wherein the model of the LLC high-voltage half-bridge resonance controller is L6599AD, and its circuit structure is:
the pin of an IC2 of the PFC controller is connected with one end of a capacitor C5 and one end of a resistor R9, the other end of the resistor R9 is connected with the other end of a capacitor C5 and one end of a resistor R10 and then connected with the pin of an IC7 of an L6599AD controller, the pin of an IC15 of the L6599AD controller is connected with the gate of a switching tube Q2, the drain of the switching tube Q2 is connected with the other end of a resistor R10, the source of the switching tube Q2 is connected with one end of an inductor L2 and the drain of a switching tube Q3, the gate of the switching tube Q3 is connected with the pin of an IC11 of an L6599AD controller, the other end of the inductor L2 is connected with one end of a primary coil of a transformer T1, the other end of the primary coil of the transformer T1 is connected with one end of a capacitor C6, and the.
After Power Factor Correction (PFC) and control circuit, a higher and more stable DC voltage (about DC 385V) is obtained at the drain of the switching tube Q2, and the voltage is divided by the resistor R9 and the resistor R10 to supply power to the high-voltage half-bridge resonant controller L6599AD, and the capacitor C5 is a noise bypass capacitor. High voltage half-bridge resonant controller L6599AD, which is a double ended controller specific to the series resonant half-bridge topology, provides a complementary duty cycle of 50%: the high-side switch Q2 and the low-side switch Q3 are in 180-degree out-of-phase for the same time, the output voltage is adjusted by adjusting the operating frequency, the duty ratio is lower than 50% in actual operation, because a fixed dead-driving time is inserted into a turn-off MOS and a turn-on MOS, the dead time is important for the normal operation of the converter, and the soft switch is ensured, so that the high-frequency operation efficiency is high, and the EMI emission is low.
The most effective mode of improving power density is to improve the switching frequency, the volume of the magnetic element under high frequency can be greatly reduced, but the improvement of the frequency can increase the switching loss of the switching tube, the efficiency of the converter is influenced, and the size of the passive device such as a transformer, an inductor and the like is greatly reduced by adopting high-frequency work. However, the switching loss brings adverse effects to the high-frequency operation, and the continuous improvement of the switching frequency is severely restricted. In order to reduce switching loss and rectifying loss and improve the working efficiency of a switching power supply converter, the LLC resonant soft switching technology is adopted for design, the circuit structure is simple, zero-voltage (ZVS) conduction of a primary main switching tube and zero-current (ZCS) turn-off of a secondary rectifying tube can be realized, the design is relatively simple, the current waveform is sinusoidal, the switching loss and noise can be greatly reduced, and the interference of electromagnetic radiation is effectively reduced.
The main circuit of the LLC resonant half-bridge converter comprises three parts, a square wave generator consisting of a switching tube Q2 and a switching tube Q3, an inductor L2, a transformer T1 and a capacitor C6 form a resonant network, a switching tube Q4 and a switching tube Q5 adopt MOS tubes to replace traditional diode designs to form a rectifying filter network, and the circuit not only absorbs the advantages of the blocking function of a resonant capacitor of the series resonant converter, the change of the current of a power resonant loop along with the weight of a load and higher efficiency under the light load, but also has the characteristic that the parallel resonant converter can work under the no-load condition and has low requirement on the current pulsation of a filter capacitor.
The square wave generator alternately drives the switching tubes Q2 and Q3 at a 50% duty cycle for each switching, thereby generating a square wave voltage Ub. Ua is obtained by rectifying alternating voltage and performing power factor correction, so that higher and more stable direct voltage is provided, current stress is reduced, and harmonic pollution is reduced.
The resonant network includes a series resonant inductance L2, a parallel resonant inductance Lm (the excitation inductance of transformer T1), and a series resonant capacitance C6. When the high-side MOS tube Q2 is switched on and the low-side MOS tube Q3 is switched off, current charges the resonant capacitor C6 through the resonant inductors L2 and Lm, the charged curve is in a waveform of the half period of a sine wave, then the switching tubes Q2 and Q3 are switched off, and after dead time, the resonant capacitor C6 and the resonant inductors L2 and Lm form a loop through the Q3 to discharge to generate the sine wave. When the low-side MOS tube Q3 is conducted and the high-side MOS tube Q2 is turned off, C6 is charged to be close to Ua, currents in resonance inductors L2 and Lm are zero, then C6 starts to discharge, the currents of the resonance inductors rise reversely from zero, the voltage of C6 reaches zero from left negative to right positive, then the voltage is charged reversely to right negative and left positive due to the effect of the resonance inductors, if no loss exists, the charging is stopped after the voltage of C6 is charged to the left side which is larger than the right Ua, the currents of the resonance inductors are zero, then the low-side MOS tube Q3 is turned off, the high-side MOS tube Q2 is conducted, and due to the fact that secondary energy output and other losses exist, the voltage of a capacitor C6 cannot be charged reversely to the degree of Ua.
Here, the resonant frequency needs to be further explained: the LLC resonance half-bridge converter has two different resonance frequencies, when the excitation inductance Lm of the transformer does not participate in the circuit resonance, the resonance frequency of the converter is defined as Fr, when the excitation inductance Lm of the transformer participates in the circuit resonance, the resonance frequency of the converter is defined as Fm, when the working frequency Fs is less than Fm, a primary switching tube of the resonance converter can not realize zero voltage conduction, and a secondary MOS tube can not realize zero current turn-off, so that the power supply is prevented from working in the area; when the working frequency Fr is less than Fs, the primary switching tube of the resonant converter can realize zero-voltage switching-on, but the secondary MOS tube has continuous current and cannot realize zero-current switching-off; when the working frequency Fm is less than Fs and less than Fr, the resonant converter is in a full-load range, the switching tube of the resonant circuit can be switched on at zero voltage, and the MOS tube can be switched off at zero current. Therefore, the working frequency of the switching tube is controlled in the interval as much as possible.
This embodiment has still adopted synchronous rectification fast disconnection intelligent control circuit, has adopted controller MP6922, and its circuit structure is: one end of a secondary coil of a transformer T1 is connected with one end of a capacitor C7, a drain of a switching tube Q4, one end of a capacitor C7 and one end of a resistor R11, a gate of the switching tube Q4 is connected with one end of a resistor R12 and one end of an IC8 pin of an MP6922, one end of a source of a switching tube Q4 is connected with IC2 and IC5 pins of the MP6922, the other end of the resistor R11 is connected with an IC6 pin of the MP6922, an IC4 pin of a controller is connected with one end of a resistor R14, the other end of the resistor R14 is connected with the other end of a secondary coil of the transformer T14, one end of the capacitor C14 and the drain of the switching tube Q14, the other end of the capacitor C14 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with a source of the switching tube Q14, one end of the resistor R14 and the other end of the gate of. The other end of the resistor R17 is connected to ground. The IC1 pin of MP6922 is connected to the gate of switch Q5.
The rectifying filter network is composed of a switch tube Q4, a switch tube Q5 and an output filter circuit, and the switch tube Q4 and the switch tube Q5 adopt special power MOS tubes with extremely low internal resistance to replace rectifying diodes so as to reduce rectifying loss, so that the efficiency of the converter is greatly improved, and dead zone voltage caused by Schottky barrier voltage does not exist.
The quick-disconnection intelligent controller drives two power MOS tubes Q4 and Q5 to synchronize LLC resonant converter correction, has the advantages of small standby loss, overheating protection, wide power supply voltage range, short quick-disconnection time (total delay is 20 ns), only 600uA static current loss during light-load working, Reverse Current Protection (RCP) function in the controller, and ensures that the MOS tubes can safely operate in a high-frequency (maximum 300KHZ switching frequency) CCM state.
The voltage detection and system reset controller can set the detection voltage by adding an external resistor, and can also set the required delay time by adding an external capacitor and a built-in delay circuit. With the RNA51957BFP chip, the IC7 pin of the RNA51957BFP chip is connected with the IC7 pin of MP6922, and the IC4 pin of the RNA51957BFP chip is connected with the digital ground.
The output end of the feedback and protection circuit is connected with the input ends of a Power Factor Correction (PFC) corrector, a high-voltage half-bridge resonance controller, a voltage detection controller and a system reset controller, and the purpose of adjusting and protecting the module is achieved through optical coupling isolation control.
The output voltage stabilizing circuit is designed by adopting a high-precision reference TL431 and has the technical characteristics of small temperature drift of reference voltage, high precision of reference voltage, low output noise voltage, wide voltage stabilizing range, large load current range and the like.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides an integrated PFC high pressure half-bridge resonance synchronous rectification AC/DC power module, mainly by feedback and protection circuit, output voltage stabilizing circuit and output filter circuit constitute which characterized in that: the device also comprises an input anti-interference and rectification filter circuit, a power factor correction and control circuit, an LLC high-voltage half-bridge resonance and control circuit, a synchronous rectification fast-disconnection intelligent control circuit and a voltage detection system reset IC controller;
the input anti-interference and rectification filter circuit is sequentially connected with a power factor correction and control circuit, an LLC high-voltage half-bridge resonance and control circuit, a synchronous rectification quick-disconnection intelligent control circuit and a voltage detection system reset IC controller.
2. An integrated PFC high voltage half bridge resonant synchronous rectified AC/DC power supply module according to claim 1, the input anti-jamming circuit and the rectifying and filtering circuit are characterized by comprising a first fuse, a second fuse, a third inductor, a fourth inductor, an eighteenth resistor, a nineteenth resistor, a ninth capacitor, a tenth capacitor, a fifth common-mode inductor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a sixth common-mode inductor, a twentieth piezoresistor, a bridge rectifier circuit, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor and a seventeenth capacitor, wherein the first fuse and the second fuse are connected with the input end of the anti-jamming circuit, the other end of the second fuse is connected with one end of the third inductor, and the other end of the third inductor is connected with one end of the eighteenth resistor, one end of the tenth capacitor and one input end of the fifth common-mode inductor; the other end of the first fuse is connected with one end of a fourth inductor, the other end of the fourth inductor is connected with one end of a nineteenth resistor, one end of a ninth capacitor and the other end of the ninth capacitor, and is grounded, the other end of a tenth capacitor is connected with the other input end of the fifth common mode inductor, and the other end of the nineteenth resistor is connected with the other end of an eighteenth resistor; one output end of the fifth common-mode inductor is connected with one end of a twelfth capacitor, one end of an eleventh capacitor and one input end of a sixth common-mode inductor, the other end of the eleventh capacitor is grounded, the other output end of the fifth common-mode inductor is connected with the other input end of the sixth common-mode inductor, one end of a thirteenth capacitor and the other end of the twelfth capacitor, the other end of the thirteenth capacitor is grounded, one output end of the sixth common-mode inductor is connected with one end of a twentieth piezoresistor and one end 1 of a bridge rectifier circuit, and the other output end of the sixth common-mode inductor is connected with the other end of the twentieth piezoresistor and one end 3 of the bridge rectifier; and the 4 end of the bridge rectifier circuit is connected with one end of a fifteenth capacitor, one end of a fourteenth capacitor and one end of a seventeenth capacitor and is grounded, the 2 end of the bridge rectifier circuit is connected with the other end of the fourteenth capacitor and one end of a sixteenth capacitor, and the other end of the sixteenth capacitor is connected with the other end of the seventeenth capacitor.
3. The integrated PFC high-voltage half-bridge resonant synchronous rectification AC/DC power supply module of claim 1, wherein the power factor correction and control circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first inductor, a first capacitor, a second electrolytic capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first switch tube and a PFC controller, wherein a drain of the first switch tube and one end of the first capacitor are connected between the other end of the first inductor and an anode of the fourth diode, the other end of the first capacitor is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is connected with a source of the first switch tube and one end of the third resistor, the other end of the third resistor is connected with the grid electrode of the first switching tube; the grid of the first switch tube is connected with the IC8 pin of the PFC controller, the other end of the second electrolytic capacitor is connected with the cathode of the third diode, the cathode of the fourth diode and one end of the fifth resistor, the other end of the fifth resistor is connected with the IC6 pin of the PFC controller, one end of the sixth resistor and one end of the third capacitor, the cathode of the first diode and the cathode of the second diode are connected and then connected with one end of the seventh resistor, the other end of the seventh resistor is connected with the IC5 pin of the PFC controller, one end of the eighth resistor is connected with one end of the fourth capacitor, the other end of the sixth resistor, the other end of the third capacitor, the other end of the fourth capacitor and the other end of the eighth resistor are connected and then connected with the other end of the second resistor, the other end of the third resistor and one end of the fourth resistor, the other end of the fourth resistor is grounded, and an IC2 pin of the PFC controller is connected with the high-voltage resonance controller.
4. The integrated PFC high-voltage half-bridge resonant synchronous rectification AC/DC power supply module of claim 1, wherein the LLC high-voltage half-bridge resonant and control circuit comprises a ninth resistor, a tenth resistor, a fifth capacitor, a sixth capacitor, a second switch tube, a third switch tube, a transformer, a second inductor and a resonant controller, wherein the pin IC2 of the PFC controller is connected with one end of the fifth capacitor and one end of the ninth resistor, the other end of the ninth resistor is connected with the other end of the fifth capacitor and one end of the tenth resistor and then connected with the pin IC7 of the resonant controller, the pin IC15 of the resonant controller is connected with the gate of the second switch tube, the drain of the second switch tube is connected with the other end of the tenth resistor, the source of the second switch tube is connected with one end of the second inductor and the drain of the third switch tube, the gate of the third switch tube is connected with the pin IC11 of the resonant controller, the other end of the second inductor is connected with one end of the transformer main coil, the other end of the transformer main coil is connected with one end of a sixth capacitor, and the other end of the sixth capacitor is connected with the source electrode of the third switching tube and then grounded.
5. The integrated PFC high-voltage half-bridge resonant synchronous rectification AC/DC power supply module of claim 1, wherein the synchronous rectification fast-disconnection intelligent control circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a fourth switching tube, a fifth switching tube, a seventh capacitor, an eighth capacitor and a fast-disconnection intelligent controller, one end of a secondary coil of a transformer is connected with one end of the seventh capacitor, the drain electrode of the fourth switching tube, one end of the seventh capacitor and one end of the eleventh resistor, the gate electrode of the fourth switching tube is connected with one end of the twelfth resistor and the IC8 pin of the fast-disconnection intelligent controller, the source electrode of the fourth switching tube is connected with the IC2 and IC5 pins of the fast-disconnection intelligent controller after being connected with one end of the thirteenth resistor, and the other end of the eleventh resistor is connected with the IC6 pin of the fast-disconnection intelligent controller, the IC4 pin of the quick-disconnection intelligent controller is connected with one end of a fourteenth resistor, the other end of the fourteenth resistor is connected with the other end of a secondary coil of a transformer T1, one end of an eighth capacitor and a drain electrode of a fifth switching tube, the other end of the eighth capacitor is connected with one end of a fifteenth resistor, the other end of the fifteenth resistor is connected with a source electrode of the fifth switching tube, one end of a seventeenth resistor and one end of a sixteenth resistor, the other end of the sixteenth resistor is connected with a grid electrode of the fifth switching tube, the other end of the seventeenth resistor is grounded, and the IC1 pin of the quick-disconnection intelligent controller is connected with the grid electrode of the fifth switching tube.
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| US11532982B2 (en) | 2021-03-08 | 2022-12-20 | Chicony Power Technology Co., Ltd. | Power factor correction circuit with fall time detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11532982B2 (en) | 2021-03-08 | 2022-12-20 | Chicony Power Technology Co., Ltd. | Power factor correction circuit with fall time detection |
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