CN203691245U - Synchronous rectifier controller used for flyback converter - Google Patents

Synchronous rectifier controller used for flyback converter Download PDF

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Publication number
CN203691245U
CN203691245U CN201320892582.XU CN201320892582U CN203691245U CN 203691245 U CN203691245 U CN 203691245U CN 201320892582 U CN201320892582 U CN 201320892582U CN 203691245 U CN203691245 U CN 203691245U
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flyback converter
controller
secondary side
model
synchronous rectifier
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华志广
巩磊
胡雪利
刘恰
韦营超
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Xian University of Technology
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Xian University of Technology
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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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Abstract

The utility model discloses a synchronous rectifier controller used for a flyback converter. The synchronous rectifier controller used for the flyback converter comprises a controller connected with a first driving module, a comparator array and a second driving module separately, the comparator array is in parallel connection with a resistor and a Zener diode, and the other end of the Zener diode is grounded. The synchronous rectifier controller used for the flyback converter of the utility model solves the problem in the prior art that the flyback converter can only work under a current interrupted or continuous single mode, or when the flyback converter works under double modes, and the work mode needs to be switched, a primary side switch tube and a secondary side switch tube are conducted simultaneously, so that the circuit efficiency is reduced. The synchronous rectifier controller used for the flyback converter of the utility model is simple in structure, saves the cost and enables the system complexity to be reduced, so that the flyback converter can realize the synchronization of a primary side and a secondary side on the interrupted and continuous conditions, the simultaneous conduction of the primary side switch tube and the secondary side switch tube is avoided, and the efficiency of a circuit is improved.

Description

A kind of synchronous rectifying controller for anti exciting converter
Technical field
The utility model belongs to switch power technology field, is specifically related to a kind of synchronous rectifying controller for anti exciting converter.
Background technology
The development of electronic technology makes the developing trend of integrated circuit in the mode of operation of low-voltage, large electric current, and this can reduce the overall power dissipation of integrated circuit.But the in the situation that of low-voltage, High-current output, the conduction voltage drop of rectifier diode is relatively high, this makes the loss of output rectifying tube larger, and power-efficient reduces.
Because anti exciting converter has that result is simple, the advantage such as the wide and multichannel output loading automatic equalization of input and output electrical isolation, buck scope, and be widely used in multiple-output electric power, in anti exciting converter, in order to realize the synchronous of primary side switching tube and secondary side switches pipe, need to detect the conduction duration of the switching tube of primary side, voltage mode is self-driven is to complete synchronous rectification according to the driving signal of the drain-source voltage generation secondary side switches pipe detecting, system effectiveness is higher, thereby is widely adopted.Due to anti exciting converter often need to be under interrupted and continuous two states continuous switch operating, under voltage mode is self-driven, thus the existing anti exciting converter problem that the conducting simultaneously of primary side switching tube and secondary side switches pipe causes circuit efficiency to reduce when still existence switches.
Utility model content
The purpose of this utility model is to provide a kind of synchronous rectifying controller for anti exciting converter, thus the problem that while having solved switching in working order that existing anti exciting converter exists, primary side switching tube and the conducting simultaneously of secondary side switches pipe cause circuit efficiency to reduce.
The technical scheme that the utility model adopts is: a kind of synchronous rectifying controller for anti exciting converter, comprise controller, controller is connected with respectively the first driver module, comparator array and the second driver module, comparator array is connected in parallel to resistance and Zener diode, the other end ground connection of Zener diode.
Feature of the present utility model is also,
Controller comprises the first pulse generating module, A/D modular converter and the second pulse generating module that are connected successively, and the first pulse generating module is connected with the first driver module, and the second pulse generating module is connected with the second driver module.
The model of controller is TMS320F28335.
The model of comparator array is LM339.
The first driver module and the second driver module are all that model is the drive plate of 2SD-315AI.
The beneficial effects of the utility model are: a kind of synchronous rectifying controller for anti exciting converter of the present utility model has solved that prior art anti exciting converter can only be operated in discontinuous current or continuously under monotype, or are operated in the double mode primary side switching tube existing while needing switching working mode and secondary side switches pipe because while conducting reduces the problem of circuit efficiency.A kind of synchronous rectifying controller for anti exciting converter of the present utility model is simple in structure, provide cost savings and reduced system complexity, make anti exciting converter can under interrupted and the condition of continuity, realize the synchronous of primary side and secondary side, conducting when having avoided once with secondary side switches pipe, has improved the efficiency of circuit.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of synchronous rectifying controller for anti exciting converter of the present utility model.
In figure, 1. controller, 2. comparator array, 3. resistance, 4. Zener diode, 5. input power, 6. flyback transformer, 7. filter capacitor, 8. load, 11. first pulse generating modules, 12.A/D modular converter, 13. second pulse generating modules, 61. primary side switching tubes, 62. secondary side switches pipes, 91. first driver modules, 92. second driver modules.
Embodiment
Below in conjunction with embodiment, the utility model is elaborated.
A kind of synchronous rectifying controller structure for anti exciting converter that the utility model provides as shown in Figure 1, comprise controller 1, controller 1 is connected with respectively the first driver module 91, comparator array 2 and the second driver module 92, comparator array 2 is connected in parallel to resistance 3 and Zener diode 4, the other end ground connection of Zener diode 4.
Controller 1 comprises that the first pulse generating module 11, A/D modular converter 12 and the second pulse generating module 13, the first pulse generating modules 11 that are connected are successively connected with the first driver module 91, and the second pulse generating module 13 is connected with the second driver module 92.
The model of controller 1 is TMS320F28335.
The model of comparator array 2 is LM339.
The first driver module 91 and the second driver module 92 are all that model is the drive plate of 2SD-315AI.
Input power 5, flyback transformer 6 and load 8 are connected to form closed-loop path successively, between flyback transformer 6 and load 8, be also parallel with filter capacitor 7, on flyback transformer 6, be respectively arranged with primary side switching tube 61 and secondary side switches pipe 62, the common formation anti exciting converter of flyback transformer 6, primary side switching tube 61, secondary side switches pipe 62 and filter capacitor 7, the first driver module 91 is connected with primary side switching tube 61, the second driver module 92 is connected with secondary side switches pipe 62, and resistance 5 is connected with secondary side switches pipe 62.
Input power 5 is stable dc power supply, can provide conversion required direct current for system; Filter capacitor 7 mainly plays the effect of filtering voltage regulation; Primary side switching tube 61 and secondary side switches pipe 62 are the MOSFET pipe that conduction impedance is smaller, switching frequency is larger, by using opening and disconnecting of PWM control technology control primary side switching tube 61, control the voltage swing of outlet side, and computing formula is
Figure BDA0000451264310000041
wherein Ton is the ON time of primary side switching tube in a PWM cycle, the cycle that T is PWM, the voltage that U provides for input power 5.Secondary side switches pipe 62 is conventional MOSFET pipe, add after comparator array device 2 can the voltage that monitors secondary side switches pipe 62 during lower than certain value to 1 one trigger impulses of controller, and then making controller 1 send PWM ripple, to control the synchronous rectification switch of secondary side switches pipe 62 after the driving of the second driver module 92 open-minded, can avoid like this switching tube at synchronous rectifier two ends in process interrupted and double mode mutual switching continuously in conducting bring the problem that power-efficient is low.Load 8 is general low-voltage, high-current load; Resistance 3 and Zener diode 4 have formed secondary side switches pipe 62 drain-source voltage testing circuits, Zener diode 4 is mainly that voltage in order to limit test point is lower than 5.8V, thereby protection its internal circuit, resistance 3 is mainly that the electric current in order to prevent from flowing through Zener diode 4 is excessive, plays certain metering function; The main control chip of controller 1 adopts the TMS320F28335 of TI company, the dominant frequency of this chip reaches 150MHz, instruction cycle is 6.67ns, 8 external interrupt, 6 high-resolution pulse width modulation modules and 12 s' analog-to-digital conversion module, can effectively process the pulse signal that comparator array device 2 sends, and can accurately send PWM1 and PWM2 and carry out corresponding primary side switching tube 61 and the secondary side switches pipe 62 controlled one by one.Detailed process is as follows:
When anti exciting converter is operated in the interrupted or condition of continuity lower time, when primary side switching tube 61 turn-offs, flyback transformer 6 releases energy, and the voltage of secondary side switches pipe 62 drain-source interpolars will decline, and the magnitude of voltage collecting is sent to comparator array 2; When comparator array 2 detect voltage drop to set the 60mv of lower limit time, give 1 one trigger impulses of controller by comparator array 2.The A/D modular converter 12 of controller 1 changes the analog pulse signal receiving into digital signal and sends to the second pulse generating module 13 again, the second pulse generating module 13 send a pulse signal after the drive amplification of the second driver module 92 to 62 1 triggering signals of secondary side switches pipe, make 62 conductings of secondary side switches pipe.
In the time of 61 conducting of primary side switching tube, flyback transformer 6 accumulation of energys, now secondary side switches pipe 62 voltages of flyback transformer 6 raise, and the drain-source voltage of secondary switching tube 62 will raise.In the time that comparator array 2 detects that voltage is elevated to the 4.0V of capping value, in order to prevent that test point from affecting control signal because voltage shakes, the magnitude of voltage detecting will be given 1 one trigger impulses of controller more afterwards by comparator array 2 and set point, the A/D modular converter 12 of controller 1 changes the analog pulse signal receiving into digital signal and sends to the second pulse generating module 13 again, the second pulse generating module 13 send a pulse signal after the drive amplification of the second driver module 92 to 62 1 triggering signals of secondary side switches pipe, secondary side switches pipe 62 is turn-offed, conducting can realize like this primary side switching tube 61 with secondary side switches pipe 62 difference time.
When anti exciting converter is when becoming on-off state continuously, by detecting the voltage between the secondary side switches pipe 62 drain-source utmost points, predeterminated voltage lower limit, in the time reaching this lower limit, send trigger impulse to the A/D modular converter 12 of controller 1 by comparator array 2, the A/D modular converter 12 of controller 1 changes the analog pulse signal receiving into digital signal and sends to the second pulse generating module 13 again, the second pulse generating module 13 sends a pulse signal and to 62 1 triggering signals of secondary side switches pipe, secondary side switches pipe 62 is disconnected after the drive amplification of the second driver module 92, make anti exciting converter be operated in on-off state.
When anti exciting converter is when intermittently becoming continuous state, by detecting the voltage between the secondary switching tube 62 drain-source utmost points, predeterminated voltage lower limit, in the time reaching this lower limit, send trigger impulse to controller 1 by comparator array 2, controller 1 makes secondary side synchronous rectification switch pipe open-minded by the second pulse generating module 13, makes anti exciting converter be operated in continuous state.
By the way, a kind of synchronous rectifying controller for anti exciting converter of the present utility model has solved that prior art anti exciting converter can only be operated in discontinuous current or continuously under monotype, or is operated in the double mode primary side switching tube existing while needing switching working mode and secondary side switches pipe because while conducting reduces the problem of circuit efficiency.A kind of synchronous rectifying controller for anti exciting converter of the present utility model is simple in structure, provide cost savings and reduced system complexity, make anti exciting converter can under interrupted and the condition of continuity, realize the synchronous of primary side and secondary side, conducting when having avoided once with secondary side switches pipe, has improved the efficiency of circuit.

Claims (5)

1. the synchronous rectifying controller for anti exciting converter, it is characterized in that, comprise controller (1), controller (1) is connected with respectively the first driver module (91), comparator array (2) and the second driver module (92), comparator array (2) is connected in parallel to resistance (3) and Zener diode (4), the other end ground connection of Zener diode (4).
2. a kind of synchronous rectifying controller for anti exciting converter as claimed in claim 1, it is characterized in that, described controller (1) comprises the first pulse generating module (11), A/D modular converter (12) and the second pulse generating module (13) that are connected successively, the first pulse generating module (11) is connected with described the first driver module (91), and the second pulse generating module (13) is connected with described the second driver module (92).
3. a kind of synchronous rectifying controller for anti exciting converter as claimed in claim 1 or 2, is characterized in that, the model of described controller (1) is TMS320F28335.
4. a kind of synchronous rectifying controller for anti exciting converter as claimed in claim 1, is characterized in that, the model of described comparator array (2) is LM339.
5. a kind of synchronous rectifying controller for anti exciting converter as claimed in claim 1 or 2, is characterized in that, described the first driver module (91) and described the second driver module (92) are all that model is the drive plate of 2SD-315AI.
CN201320892582.XU 2013-12-31 2013-12-31 Synchronous rectifier controller used for flyback converter Expired - Fee Related CN203691245U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106992664A (en) * 2016-01-21 2017-07-28 产晶积体电路股份有限公司 Isolated power conversion system
CN110476342A (en) * 2017-03-29 2019-11-19 Fdk株式会社 Insulated switching power supply
CN111541361A (en) * 2020-06-05 2020-08-14 上海晶丰明源半导体股份有限公司 Synchronous rectification isolation drive circuit and synchronous rectification isolation power supply system
CN114421566A (en) * 2022-01-20 2022-04-29 瀚昕微电子(无锡)有限公司 Charging management circuit and charging circuit comprising same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106992664A (en) * 2016-01-21 2017-07-28 产晶积体电路股份有限公司 Isolated power conversion system
CN106992664B (en) * 2016-01-21 2019-05-21 产晶积体电路股份有限公司 Isolated power conversion system
CN110476342A (en) * 2017-03-29 2019-11-19 Fdk株式会社 Insulated switching power supply
CN110476342B (en) * 2017-03-29 2021-06-22 Fdk株式会社 Insulated switching power supply
CN111541361A (en) * 2020-06-05 2020-08-14 上海晶丰明源半导体股份有限公司 Synchronous rectification isolation drive circuit and synchronous rectification isolation power supply system
CN111541361B (en) * 2020-06-05 2023-09-22 上海晶丰明源半导体股份有限公司 Synchronous rectification isolation driving circuit and synchronous rectification isolation power supply system
CN114421566A (en) * 2022-01-20 2022-04-29 瀚昕微电子(无锡)有限公司 Charging management circuit and charging circuit comprising same
CN114421566B (en) * 2022-01-20 2023-06-20 瀚昕微电子(无锡)有限公司 Charging management circuit and charging circuit comprising same

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