CN111146963A - AC-DC power switch circuit - Google Patents
AC-DC power switch circuit Download PDFInfo
- Publication number
- CN111146963A CN111146963A CN201811299942.9A CN201811299942A CN111146963A CN 111146963 A CN111146963 A CN 111146963A CN 201811299942 A CN201811299942 A CN 201811299942A CN 111146963 A CN111146963 A CN 111146963A
- Authority
- CN
- China
- Prior art keywords
- triode
- port
- module
- transformer
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001360 synchronised effect Effects 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 238000001914 filtration Methods 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims description 40
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 18
- 230000004044 response Effects 0.000 description 9
- 230000001052 transient effect Effects 0.000 description 7
- 230000000670 limiting effect Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/344—Active dissipative snubbers
Abstract
The invention discloses an AC-DC power supply switch circuit, which belongs to the field of power supply design and comprises an input end, an EMI filtering module, an LLC module, a synchronous rectification module, an output filtering module, an output end, an LLC driving module, a current detection module, a rectification driving module, an auxiliary power supply module, a control module and a voltage detection module; the input end is connected with the output end through the EMI filtering module, the LLC module, the synchronous rectification module and the output filtering module in sequence. The invention is based on LLC half-bridge resonance and synchronous rectification technology, realizes a high-efficiency AC/DC switching power supply switching circuit, has the advantages of high efficiency, small heat productivity, good stability, small volume and the like, can obtain different output voltages and powers by adjusting parameters, and meets the requirements of a plurality of fields such as electric automobiles, security equipment computer adapters and the like.
Description
Technical Field
The invention relates to the field of power supply design, in particular to an AC-DC power supply switch circuit.
Background
To improve the efficiency of the switching power supply, which is a continuous pursuit of a switching power supply designer, it is necessary to reduce the loss of the switching power supply in order to improve the efficiency of the switching power supply. The three major losses of the switching power supply are the switching loss of the power device, the conversion loss of the transformer and the conversion loss of the rectifying part. The conversion loss of the transformer is difficult to break through by applying a new circuit structure, so that the method starts from the rest two parts: the LLC resonant circuit can effectively reduce the switching loss of a power device; the synchronous rectification technology is applied, and the current transformation loss of the rectification part can be greatly reduced.
The traditional hard switch has large switching loss and turn-off loss, the LLC resonant converter has very obvious advantages compared with the traditional PWM soft switch, and the soft switch technology can realize the zero-voltage ZVS turn-on of the primary side switch and the zero-current ZCS turn-off of the secondary side rectifier tube. And it has the advantages of high frequency of switching frequency, high power density, high efficiency, wide input voltage range, convenient use of magnetic integration technology, etc. In addition, the efficiency of the resonant circuit in the high-voltage circuit can be improved, meanwhile, the no-load working capacity of the resonant circuit is high, and after current feedback is added into the LLC resonant tank circuit, the capacity of the load weight can be effectively reflected and the dynamic response can be improved. With the continuous improvement of the performance of the digital control chip and the increase of related chips, the LLC resonant converter can adopt more schemes [3], has more flexible design, can obviously simplify a resonant circuit, and improves the performance and the integration level of the resonant converter. The efficiency of LLC resonant converters can often reach over 90%, up to 97%, under different loads.
In the current LLC control mode, a voltage mode is commonly used. However, since the voltage feedback is applied to the power supply output and is not directly connected to the primary current, additional circuitry is added to provide overload and short-circuit protection. When the input and the output generate transient change, the transient response speed is relatively slow. Moreover, under the condition of no current feedforward, the front-stage error interference of the LLC cannot be timely processed by the control chip, and the realization of the soft switch is easily influenced.
Disclosure of Invention
In view of the above, the invention realizes a high-efficiency AC/DC switching power supply switching circuit based on LLC half-bridge resonance and synchronous rectification technology, the switching circuit has the advantages of high efficiency, small heat generation, good stability, small size, etc., different output voltages and powers can be obtained by adjusting parameters, and the requirements in a plurality of fields such as electric vehicles, security equipment computer adapters, etc. are met.
The invention solves the problems through the following technical means:
an AC-DC power supply switch circuit is characterized by comprising an input end, an EMI filtering module, an LLC module, a synchronous rectification module, an output filtering module, an output end, an LLC driving module, a current detection module, a rectification driving module, an auxiliary power supply module, a control module and a voltage detection module;
the input end is connected with the output end through an EMI filtering module, an LLC module, a synchronous rectification module and an output filtering module in sequence;
an input port of the current detection module is connected to a connection circuit of the LLC module and the synchronous rectification module, and an output port of the current detection module is connected with the control module;
the control module is connected with the LLC module through the LLC driving module and is connected with the synchronous rectification module through the rectification driving module;
an input port of the auxiliary power supply module is connected with the EMI filtering module, and an output port of the auxiliary power supply module is respectively connected with the LLC driving module, the rectification driving module and the control module;
the input port of the voltage detection module is connected to the connection circuit of the output filter module and the output end, and the output port of the voltage detection module is connected to the control module.
Further, the LLC module includes a first switching tube, a second switching tube, a first triode, a second triode, a VI + port, a GH port, an SH port, a GL port, and a first forward transformer;
the VI + port is connected with a drain electrode of the first switching tube, a source electrode of the first switching tube is respectively connected with a primary synonym end of the first forward transformer and a drain electrode of the second switching tube, the GH port is connected with an anode of the first diode through the first resistor, a cathode of the first diode is connected with a grid electrode of the first switching tube, the GH port is connected with a base electrode of the first triode through the second resistor, a collector electrode of the first triode is connected with a cathode of the first diode, an emitter electrode of the first triode is connected with the SH port, an anode of the second diode is connected with the GH port, a cathode of the second diode is connected with a base electrode of the first triode, and the SH port is connected with a grid electrode of the first switching tube through the third resistor;
the primary synonym end of the first transformer is connected with the drain electrode of the second switch tube, the source electrode of the second switch tube is connected with the primary synonym end of the first transformer through a first capacitor, the GL port is connected with the anode of a third diode through a fourth resistor, the cathode of the third diode is connected with the grid electrode of the second switch tube, the GL port is connected with the base electrode of the second triode through a fifth resistor, the emitter electrode of the second triode is respectively connected with the source electrode of the second switch tube and the ground, the collector electrode of the second triode is connected with the grid electrode of the second switch tube, the anode of the fourth diode is connected with the GL port, the cathode of the fourth diode is connected with the base electrode of the second triode, and a sixth resistor is connected in series between the grid electrode and the source electrode of the second switch tube.
Further, the synchronous rectification module comprises a third switching tube, a fourth switching tube, an SR2G port, an SR1DS port, an SR1G port, a VO + port and a VO-port, a source electrode of the third switching tube is connected with a secondary dotted terminal of the first transformer, a drain electrode of the third switching tube is connected with the VO-port, a seventh resistor is connected in series between a gate electrode and a drain electrode of the third switching tube, the SR2G port is connected with the gate electrode of the third switching tube through an eighth resistor, a SR2G port is connected with a cathode of a fifth diode, and an anode of the fifth diode is connected with the gate electrode of the third switching tube;
the SR1DS port is connected with the second dotted terminal of the first transformer through a ninth resistor, the SR1DS port is connected with the VO-port through a tenth resistor, and the tenth resistor is connected with a second capacitor in parallel;
the source electrode of the fourth switch tube is connected with the second synonym end of the first transformer, the drain electrode of the fourth switch tube is connected with the VO-port, an eleventh resistor is connected in series between the grid electrode and the drain electrode of the fourth switch tube, the SR1G port is connected with the grid electrode of the fourth switch tube through a twelfth resistor, the SR1G port is connected with the cathode of the sixth diode, and the anode of the sixth diode is connected with the grid electrode of the fourth switch tube.
Furthermore, the EMI filtering module comprises an AC + port, an AC-port, a second transformer, a rectifier and a negative temperature coefficient thermistor, wherein a third capacitor and a fourth capacitor are connected in parallel between the AC + port and the AC-port, the AC + port and the AC-port are respectively connected with the dotted terminals of the second transformer, a fifth capacitor and a sixth capacitor are connected in series and then connected in parallel between the dotted terminals of the second transformer, the dotted terminal of the second transformer is connected in parallel with a seventh capacitor, the dotted terminal of the second transformer is connected with the input terminal of the rectifier, the first output terminal of the rectifier is connected with the VI + port through the negative temperature coefficient thermistor, the second output terminal of the rectifier is grounded, and an eighth capacitor is connected between the VI + port and the ground.
Furthermore, the LLC driving module includes a third transformer, a third triode, a fourth triode, a fifth triode, and a sixth triode, the port of the prott 1 of the control module is connected to the base of the third triode and the base of the fifth triode through a thirteenth resistor and a fifteenth resistor, respectively, and the port of the prott 2 of the control module is connected to the base of the fourth triode and the base of the sixth triode through a fourteenth resistor and a seventeenth resistor, respectively; the collector electrode of the third triode is connected with the emitter electrode of the fourth triode; an emitter electrode of the third triode is connected with a collector electrode of the fifth triode, an emitter electrode of the fifth triode is connected with a collector electrode of the sixth triode, and an emitter electrode of the sixth triode is connected with a collector electrode of the fourth triode; a collector of the third triode is grounded through a ninth capacitor, the collector of the third triode is connected with the auxiliary power supply through a sixteenth resistor, a primary homonymy end of the third transformer is connected with an emitter of the third triode, and a primary synonym end of the third transformer is connected with a collector of the fourth triode; the first secondary homonymous end of the third transformer is connected with a GL port, the first secondary synonym end of the third transformer is grounded, the second secondary homonymous end of the third transformer is connected with a GH port, and the second secondary synonym end of the third transformer is connected with an SH port.
Further, the rectifying driving module comprises a fourth transformer, a seventh triode, an eighth triode, a ninth triode and a thirteenth triode, a port of the PROUT3 of the control module is respectively connected with a base electrode of the seventh triode and a base electrode of the ninth triode through an eighteenth resistor and a twentieth resistor, and a port of the PROUT4 of the control module is respectively connected with a base electrode of the eighth triode and a base electrode of the thirteenth triode through a nineteenth resistor and a twenty-first resistor; the collector electrode of the seventh triode is connected with the emitter electrode of the eighth triode; an emitter electrode of the seventh triode is connected with a collector electrode of the ninth triode, an emitter electrode of the ninth triode is connected with a collector electrode of the thirteenth triode, and an emitter electrode of the thirteenth triode is connected with a collector electrode of the eighth triode; a collector of the seventh triode is grounded through a tenth capacitor, the collector of the seventh triode is connected with the auxiliary power supply through a twelfth resistor, a primary homonymous end of the fourth transformer is connected with an emitter of the seventh triode, and a primary heteronymous end of the fourth transformer is connected with a collector of the eighth triode; the first secondary dotted terminal of the fourth transformer is connected with the SR1G port, the first secondary different-dotted terminal of the fourth transformer is grounded, the second secondary dotted terminal of the fourth transformer is connected with the SR2G port, and the second secondary different-dotted terminal of the fourth transformer is grounded.
Further, the control module adopts a peak current mode as a control mode of the LLC, the control module adopts charge current control, a ramp compensation signal is integrated within the control module, and the switching frequency is adjusted by comparing the control voltage of the total charge (integrated switching current) of the switching current.
Further, the control module adopts hybrid power control, uses pulse width modulation and closes the synchronous rectification module when the load is light; at heavy loads, a pulse frequency modulation mode is used.
Furthermore, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all N-channel enhanced MOS tubes; the rectifier is an RS809 type rectifier; the third triode, the fifth triode, the seventh triode and the ninth triode are all NPN type triodes, and the fourth triode, the sixth triode, the eighth triode and the thirteenth triode are all PNP type triodes; the control module adopts a FAN7688 type control chip.
The AC-DC power supply switch circuit has the following beneficial effects:
the invention discloses an AC-DC power supply switch circuit, which belongs to the field of power supply design and comprises an input end, an EMI filtering module, an LLC module, a synchronous rectification module, an output filtering module, an output end, an LLC driving module, a current detection module, a rectification driving module, an auxiliary power supply module, a control module and a voltage detection module; the input end is connected with the output end through the EMI filtering module, the LLC module, the synchronous rectification module and the output filtering module in sequence. The invention is based on LLC half-bridge resonance and synchronous rectification technology, realizes a high-efficiency AC/DC switching power supply switching circuit, has the advantages of high efficiency, small heat productivity, good stability, small volume and the like, can obtain different output voltages and powers by adjusting parameters, and meets the requirements of a plurality of fields such as electric automobiles, security equipment computer adapters and the like.
The invention adopts current mode control, can not only carry out faster output regulation aiming at load transient state, but also simplify a control loop, and can ensure that the power supply design is simpler and more convenient. In terms of dynamic load response, current mode LLC provides lower voltage drop, lower overshoot, and faster settling response than voltage mode LLC; in the aspect of linear ripple suppression, the current mode LLC control suppresses linear ripple by 5 times better than the voltage mode, and the output voltage ripple can even be ignored; in terms of line transients, current mode LLC control provides 10 times less overshoot and 10 times less voltage drop than voltage mode control.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic circuit diagram of an AC-DC power switching circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of an LLC module provided by the invention;
FIG. 3 is a schematic circuit diagram of a synchronous rectification module according to the present invention;
FIG. 4 is a schematic circuit diagram of an EMI filter module according to the present invention;
FIG. 5 is a schematic circuit diagram of an LLC driver module provided by the invention;
FIG. 6 is a schematic circuit diagram of a rectifying driving module according to the present invention;
FIG. 7 is a schematic circuit diagram of a current detection module according to the present invention;
FIG. 8 is a schematic circuit diagram of a voltage detection module according to the present invention;
fig. 9 is a schematic circuit diagram of the auxiliary power supply of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The present invention will be described in detail with reference to the accompanying drawings, and fig. 1 is a schematic diagram of an AC-DC power switch circuit provided by the present invention, where the switch circuit includes an input terminal, an EMI filter module, an LLC module, a synchronous rectification module, an output filter module, an output terminal, an LLC driving module, a current detection module, a rectification driving module, an auxiliary power supply module, a control module, and a voltage detection module; the input end is connected with the output end through an EMI filtering module, an LLC module, a synchronous rectification module and an output filtering module in sequence; an input port of the current detection module is connected to a connection circuit of the LLC module and the synchronous rectification module, and an output port of the current detection module is connected with the control module; the control module is connected with the LLC module through the LLC driving module and is connected with the synchronous rectification module through the rectification driving module; an input port of the auxiliary power supply module is connected with the EMI filtering module, and an output port of the auxiliary power supply module is respectively connected with the LLC driving module, the rectification driving module and the control module; the input port of the voltage detection module is connected to the connection circuit of the output filter module and the output end, and the output port of the voltage detection module is connected to the control module.
Specifically, after the signal of the control module is amplified by the driving circuit, the switching tubes of the LLC and the SR are controlled, so that the LLC can be switched on at zero voltage and switched off at zero current, and synchronous rectification can be completed. A current detection circuit is arranged between the LLC and the main transformer, and transmits current information to the control module, so that the control module can perform overcurrent protection on the power supply and well control the LLC. Finally, there is a voltage feedback control module at the output of the circuit.
Fig. 2 is a schematic circuit connection diagram of an LLC module provided in the present invention, where the LLC module includes a first switching tube, a second switching tube, a first triode, a second triode, a VI + port, a GH port, an SH port, a GL port, and a first forward transformer;
the VI + port is connected with a drain electrode of the first switching tube, a source electrode of the first switching tube is respectively connected with a primary synonym end of the first forward transformer and a drain electrode of the second switching tube, the GH port is connected with an anode of the first diode through the first resistor, a cathode of the first diode is connected with a grid electrode of the first switching tube, the GH port is connected with a base electrode of the first triode through the second resistor, a collector electrode of the first triode is connected with a cathode of the first diode, an emitter electrode of the first triode is connected with the SH port, an anode of the second diode is connected with the GH port, a cathode of the second diode is connected with a base electrode of the first triode, and the SH port is connected with a grid electrode of the first switching tube through the third resistor;
the primary synonym end of the first transformer is connected with the drain electrode of the second switch tube, the source electrode of the second switch tube is connected with the primary synonym end of the first transformer through a first capacitor, the GL port is connected with the anode of a third diode through a fourth resistor, the cathode of the third diode is connected with the grid electrode of the second switch tube, the GL port is connected with the base electrode of the second triode through a fifth resistor, the emitter electrode of the second triode is respectively connected with the source electrode of the second switch tube and the ground, the collector electrode of the second triode is connected with the grid electrode of the second switch tube, the anode of the fourth diode is connected with the GL port, the cathode of the fourth diode is connected with the base electrode of the second triode, and a sixth resistor is connected in series between the grid electrode and the source electrode of the second switch tube.
Specifically, the first switching tube and the second switching tube are switching tube MOSFETs, and the GH port and the SH port are driving signals from the control module, and are driven after being amplified by the first triode and the second triode S8550. The first capacitor is a resonance capacitor, the primary side of the transformer is an excitation inductor, and the primary leakage inductor is used for the resonance inductor, so that a magnetic device can be saved.
Fig. 3 is a schematic circuit connection diagram of a synchronous rectification module provided by the present invention, where the synchronous rectification module includes a third switching tube, a fourth switching tube, an SR2G port, an SR1DS port, an SR1G port, a VO + port, and a VO-port, a source of the third switching tube is connected to a second dotted terminal of the first transformer, a drain of the third switching tube is connected to the VO-port, a seventh resistor is connected in series between a gate and a drain of the third switching tube, the SR2G port is connected to the gate of the third switching tube through an eighth resistor, the SR2G port is connected to a cathode of a fifth diode, and an anode of the fifth diode is connected to the gate of the third switching tube;
the SR1DS port is connected with the second dotted terminal of the first transformer through a ninth resistor, the SR1DS port is connected with the VO-port through a tenth resistor, and the tenth resistor is connected with a second capacitor in parallel;
the source electrode of the fourth switch tube is connected with the second synonym end of the first transformer, the drain electrode of the fourth switch tube is connected with the VO-port, an eleventh resistor is connected in series between the grid electrode and the drain electrode of the fourth switch tube, the SR1G port is connected with the grid electrode of the fourth switch tube through a twelfth resistor, the SR1G port is connected with the cathode of the sixth diode, and the anode of the sixth diode is connected with the grid electrode of the fourth switch tube.
In actual operation, the PROUT3 port and the PROUT4 port of the control module are used for controlling driving signals of the SR switch tube, and SR1DS is voltage feedback between the drain and the source of the SR1 switch tube. The synchronous rectification conduction time for each switching cycle of SR1 and SR2 was measured using a single pin (SR1DS pin). When SR operates, the SR1DS voltage is 0 or high. However, SR1DS switches rapidly when the voltage changes. When all SR switches are closed, the SR1DS voltage will oscillate. When the speed of the SR1DS voltage change exceeds 0.25V/100ns on the rising edge, or exceeds 0.2V/100ns on the falling edge, a switching transition in the SR conduction state is detected. Based on the detected switching transition, FAN7688 predicts the current zero-crossing instant in the next SR switching cycle, at which point the SR1DS voltage jumps and the SR starts.
Specifically, the SR1DS port is used for detecting the voltage of the SR, and the detected drain voltage of the SR is transmitted back to the control module, so that the control module can make appropriate adjustments to the driving signal of the SR. When a positive signal comes from the transformer, the SR2G port is also positive, the gate voltage is higher than the source voltage, and the third switching tube is conducted to generate an output voltage; at this time, the port SR1G is negative, and the fourth switch tube is turned off. When a negative signal comes from the transformer, the port SR2G is turned off, the third switching tube is turned off, the port SR2G is positive, the fourth switching tube is turned on, and the output voltage is positive up and negative down. Between the SR1G port and SR2G port conduction, there is very little dead time to prevent simultaneous conduction. The frequency and the input voltage of the ports of the driving signals SR1GSR2G and SR2GSR2G are the same, namely the driving signals correspond to the driving signals of the front stage switching tubes, and the normal operation is ensured.
Fig. 4 is a schematic circuit connection diagram of an EMI filter module according to the present invention, where the EMI filter module includes an AC + port, an AC-port, a second transformer, a rectifier, and a negative temperature coefficient thermistor, a third capacitor and a fourth capacitor are connected in parallel between the AC + port and the AC-port, the AC + port and the AC-port are respectively connected to a dotted terminal of the second transformer, a fifth capacitor and a sixth capacitor are connected in series and then connected in parallel between dotted terminals of the second transformer, the dotted terminal of the second transformer is connected in parallel with a seventh capacitor, the dotted terminal of the second transformer is connected to an input terminal of the rectifier, a first output terminal of the rectifier is connected to the VI + port through the negative temperature coefficient thermistor, a second output terminal of the rectifier is grounded, and an eighth capacitor is connected between the VI + port and ground.
Specifically, the rectifying circuit uses an RS809 rectifier, and the internal structure of the rectifying circuit is equivalent to a rectifying bridge consisting of four diodes. The thirteenth resistor is a negative temperature coefficient thermistor, and has the characteristic that the higher the temperature is, the smaller the resistance is. When the power supply is started, 220V alternating current is rectified by a fuse and a thermistor to charge a capacitor, the characteristic of the capacitor is that the instantaneous charging current is the maximum, so that impact is brought to a rectifier diode and a fuse in the front, the capacitor is easy to damage, in order to improve the safety coefficient of power supply design, a resistor is added after the fuse to limit the current, when the resistor is larger, the current limiting effect is good, but the electric energy consumed by the resistor is larger, and after the switching power supply is started, the current limiting resistor has no effect, but the electric power is wasted. In order to achieve better current limiting effect and save electricity. At normal temperature, the resistor is generally larger, a better current limiting effect is achieved when the machine is started, after the power supply is started, the working current passes through the thermistor to enable the thermistor to generate heat, the resistance value of the thermistor is greatly reduced, and the power consumption of the thermistor is reduced to the minimum after the power supply is started.
Fig. 5 is a schematic circuit connection diagram of an LLC driving module provided in the present invention, where the LLC driving module includes a third transformer, a third triode, a fourth triode, a fifth triode, and a sixth triode, a port of the prott 1 of the control module is respectively connected to a base of the third triode and a base of the fifth triode through a thirteenth resistor and a fifteenth resistor, and a port of the prott 2 of the control module is respectively connected to a base of the fourth triode and a base of the sixth triode through a fourteenth resistor and a seventeenth resistor; the collector electrode of the third triode is connected with the emitter electrode of the fourth triode; an emitter electrode of the third triode is connected with a collector electrode of the fifth triode, an emitter electrode of the fifth triode is connected with a collector electrode of the sixth triode, and an emitter electrode of the sixth triode is connected with a collector electrode of the fourth triode; a collector of the third triode is grounded through a ninth capacitor, the collector of the third triode is connected with the auxiliary power supply through a sixteenth resistor, a primary homonymy end of the third transformer is connected with an emitter of the third triode, and a primary synonym end of the third transformer is connected with a collector of the fourth triode; the first secondary homonymous end of the third transformer is connected with a GL port, the first secondary synonym end of the third transformer is grounded, the second secondary homonymous end of the third transformer is connected with a GH port, and the second secondary synonym end of the third transformer is connected with an SH port.
Fig. 6 is a schematic circuit connection diagram of a rectifying drive module provided by the present invention, where the rectifying drive module includes a fourth transformer, a seventh triode, an eighth triode, a ninth triode, and a thirteenth triode, a port of the rout3 of the control module is respectively connected to a base of the seventh triode and a base of the ninth triode through an eighteenth resistor and a twentieth resistor, and a port of the rout4 of the control module is respectively connected to a base of the eighth triode and a base of the thirteenth triode through a nineteenth resistor and a twenty-first resistor; the collector electrode of the seventh triode is connected with the emitter electrode of the eighth triode; an emitter electrode of the seventh triode is connected with a collector electrode of the ninth triode, an emitter electrode of the ninth triode is connected with a collector electrode of the thirteenth triode, and an emitter electrode of the thirteenth triode is connected with a collector electrode of the eighth triode; a collector of the seventh triode is grounded through a tenth capacitor, the collector of the seventh triode is connected with the auxiliary power supply through a twelfth resistor, a primary homonymous end of the fourth transformer is connected with an emitter of the seventh triode, and a primary heteronymous end of the fourth transformer is connected with a collector of the eighth triode; the first secondary dotted terminal of the fourth transformer is connected with the SR1G port, the first secondary different-dotted terminal of the fourth transformer is grounded, the second secondary dotted terminal of the fourth transformer is connected with the SR2G port, and the second secondary different-dotted terminal of the fourth transformer is grounded.
Specifically, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all N-channel enhancement type MOS tubes; the rectifier is an RS809 type rectifier; the third triode, the fifth triode, the seventh triode and the ninth triode are all NPN type triodes, and the fourth triode, the sixth triode, the eighth triode and the thirteenth triode are all PNP type triodes; the control module adopts a FAN7688 type control chip.
In actual operation, the signal is converted into a square wave signal. The signal from the control chip is a square wave signal and is converted into a driving signal of a switching tube of the LLC. When the PROUT1 signal of the control module is at high level and the PROUT2 signal of the control module is at low level, the induction of the GH and GL ports is positive; when the signal of PROUT2 is high, and when the signal of PROUT1 is low, the GH and GL ports are induced to be negative, thereby outputting square wave signals.
Fig. 7 is a schematic circuit connection diagram of the current detection module provided by the present invention, in which the ratio of the primary and secondary turns of the transformer is 1: 1, it is used for isolating DC and AC, and transferring the current and voltage information of AC end to DC side, and the capacitor C111 can be used for filtering. The ICS is primary side voltage detection, which passes the detected voltage to the ICS pin of FAN 7688. When the voltage of the ICS pin is lower than 0.075V, synchronous rectification is disabled; when the voltage of the ICS pin is higher than 0.15V, synchronous rectification is started, and when the peak value of VICS is higher than 0.25V, the dead time of the synchronous rectification is reduced to a programming value; when the voltage of the ICS pin is higher than 1.9V, overcurrent protection is started; and the CS is connected to a CS pin of FAN7688 for overcurrent detection, and when the absolute value of the voltage of the CS pin is more than 3.5V, overcurrent protection is started.
Fig. 8 is a circuit connection diagram of the voltage detection module provided by the present invention, the operation starting voltage of the FB signal is 2.4V, and when the feedback signal reaches 2.4V, the control chip generates the driving signals PROUT1 and PROUT 2. When the voltage detected by the FB terminal changes, the control chip can adjust the frequency or the pulse width of the driving signal in time to ensure the stability of the output voltage. The output voltage can be changed by adjusting the ratio of the divider resistors R117, R118, and R119. Such as: when the resistance values of R118 and R119 are increased, the divided voltage obtained by FB is increased, the obtained output voltage is reduced, and the chip can start to work under the condition of smaller input voltage.
Fig. 9 is a schematic circuit diagram of the auxiliary power supply of the present invention. The auxiliary power supply of the switching power supply is mainly used for supplying power to a control circuit, a driving circuit or a monitoring circuit of a power supply system of a power main loop. The design of the auxiliary power supply not only affects the size, efficiency, stability, reliability and cost of the whole power supply, but also affects the design strategy of the whole switching power supply. Although the output power required by the auxiliary power supply is not large, it is a very important component in the switching power supply, and the performance of the whole power supply is affected. The switch power supply is developing towards the direction of light, small, thin, high reliability, high stability, high efficiency and intellectualization, a proper auxiliary power supply system is selected according to the specification requirement of the whole switch power supply system, and firstly, a simple, light and economic auxiliary power supply is designed on the premise of meeting the reliability.
The input end of the auxiliary power supply is taken from the main circuit, the input end of the auxiliary power supply is taken from 310V direct current obtained by 220V alternating current after being subjected to EMI filter, rectifier bridge and high-voltage rectification, the output end of the auxiliary power supply is 15V direct current, and the output end of the auxiliary power supply is supplied to the control chip FAN7688 and the driving circuit. The front stage of the transformer uses two filter capacitors to filter out AC components. The KA5H0380R is a PWM control chip, and its start power is supplied by C307 and C308, and after start, the power is supplied continuously by the end of the transformer 1 through the loop of the diode V305 and through the filtering of the capacitor of C308. TL431 is a reference voltage source and serves as a reference voltage, when the feedback voltage is higher than the reference voltage, the photoelectric coupler PC817 is switched on, the voltage between pins 3 and 4 of the PC817 drops, the change situation of the output voltage is fed back to KA5H0380R, and the KA5H0380R outputs the duty ratio of a driving pulse to adjust the rising or falling of the output voltage, so that the output closed-loop voltage stabilization is finally realized. The transformer and the photoelectric coupler PC817 play a role of isolation, and prevent crosstalk of alternating current and direct current.
Further, the control module adopts a peak current mode as a control mode of the LLC, the control module adopts charge current control, a ramp compensation signal is integrated within the control module, and the switching frequency is adjusted by comparing the control voltage of the total charge (integrated switching current) of the switching current.
Peak current mode control has numerous advantages, including ease of control loop design; the transient closed loop has fast response, and the transient response to the change of the input voltage and the change of the output load is fast; the pulse-by-pulse current limiting function is inherent; the input voltage adjusting technology can be compared with the input feedforward technology of voltage type control; has the function of automatic current equalizing and parallel connection.
After the peak current mode control adopts a slope compensation measure, most problems caused by the current control mode can be satisfactorily solved, and the exertion of the advantages of the current control mode is not influenced. Because the transformer primary switching current does not increase monotonically, the switching current itself cannot be used for Pulse Frequency Modulation (PFM) to regulate the output voltage. The peak primary current does not accurately reflect the load condition because a large circulating current (magnetizing current) is included in the main switching current. However, the integral of the switching current increases monotonically, with a peak value similar to that used for peak current mode control. The peak current type is adopted. The control chip FAN7688 adopts charge current control, internally integrates a slope compensation signal, and compares the control voltage of the total charge (integral switch current) of the switch current to adjust the switch frequency. Because the switching current charge is proportional to the average input current, the charge control provides a fast inner cycle and provides good transient response, including intrinsic feedback, during a switching cycle.
Further, the control module adopts hybrid power control, uses pulse width modulation and closes the synchronous rectification module when the load is light; at heavy loads, a pulse frequency modulation mode is used.
Specifically, when the error amplifier Voltage (VCOMP) is below the PWM mode threshold, the internal COMP signal is clamped at the threshold level and PFW operation is switched to PWM mode. In the PWM mode, the switching frequency is fixed by the internal COMP voltage, and the duty cycle is determined by the difference between the COMP voltage and the PWM mode threshold voltage region. Thus, when VCOMP decreases below the threshold for the PMW mode, the duty cycle decreases, which limits the switching frequency under light load conditions.
The pulse width modulation mode can be set between 1.5V and 1.9V using a resistor between the PWM pins. For PFW mode, a self-rising slope timing capacitor voltage determination Resistor (RFMIN) is connected to the FMIN pin, giving a minimum switching frequency of.
The lowest programmable switching frequency is limited to run on an internal digital counter 40MHz clock. A 10-bit counter is used and the digital oscillator of minimum switching frequency is 39 kilohertz (40MHz/1024=39 kilohertz). Therefore, the maximum allowable value of RFMIN is 25.5K Ω.
It should be noted that, an output filter circuit may be added according to actual situations, so that the noise wave output by the synchronously rectified signal is eliminated through the filter capacitor, and a smooth dc voltage waveform is obtained.
The power of the AC-DC power switching circuit provided by the case is a 250W switching power supply, the power supply can be used for a power supply special for debugging a steering engine, and compared with a direct-current power supply mode, the power supply has four advantages:
1) the current of 20A at most can be provided, and the defect of insufficient power supply of a direct-current power supply is overcome;
2) the power supply is small in size, easy to carry and capable of being used for indoor and outdoor field debugging;
3) the efficiency is high, and the heat productivity is low;
4) the output voltage is stable, and the power density is large. In addition, different output voltages and powers can be obtained by adjusting and changing some device parameters of the internal design, so the embodiment is a generic technology, can be popularized and applied to multiple product fields, such as electric automobiles, security equipment, computer adapters and the like, and has wide market prospects.
The invention discloses an AC-DC power supply switch circuit, which belongs to the field of power supply design and comprises an input end, an EMI filtering module, an LLC module, a synchronous rectification module, an output filtering module, an output end, an LLC driving module, a current detection module, a rectification driving module, an auxiliary power supply module, a control module and a voltage detection module; the input end is connected with the output end through the EMI filtering module, the LLC module, the synchronous rectification module and the output filtering module in sequence. The invention is based on LLC half-bridge resonance and synchronous rectification technology, realizes a high-efficiency AC/DC switching power supply switching circuit, has the advantages of high efficiency, small heat productivity, good stability, small volume and the like, can obtain different output voltages and powers by adjusting parameters, and meets the requirements of a plurality of fields such as electric automobiles, security equipment computer adapters and the like.
The invention adopts current mode control, can not only carry out faster output regulation aiming at load transient state, but also simplify a control loop, and can ensure that the power supply design is simpler and more convenient. In terms of dynamic load response, current mode LLC provides lower voltage drop, lower overshoot, and faster settling response than voltage mode LLC; in the aspect of linear ripple suppression, the current mode LLC control suppresses linear ripple by 5 times better than the voltage mode, and the output voltage ripple can even be ignored; in terms of line transients, current mode LLC control provides 10 times less overshoot and 10 times less voltage drop than voltage mode control.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An AC-DC power supply switch circuit is characterized by comprising an input end, an EMI filtering module, an LLC module, a synchronous rectification module, an output filtering module, an output end, an LLC driving module, a current detection module, a rectification driving module, an auxiliary power supply module, a control module and a voltage detection module;
the input end is connected with the output end through an EMI filtering module, an LLC module, a synchronous rectification module and an output filtering module in sequence;
an input port of the current detection module is connected to a connection circuit of the LLC module and the synchronous rectification module, and an output port of the current detection module is connected with the control module;
the control module is connected with the LLC module through the LLC driving module and is connected with the synchronous rectification module through the rectification driving module;
an input port of the auxiliary power supply module is connected with the EMI filtering module, and an output port of the auxiliary power supply module is respectively connected with the LLC driving module, the rectification driving module and the control module;
an input port of the voltage detection module is connected to a connecting circuit between the output filtering module and an output end, and an output port of the voltage detection module is connected to the control module;
the LLC module comprises a first switch tube, a second switch tube, a first triode, a second triode, a VI + port, a GH port, an SH port, a GL port and a first forward transformer;
the VI + port is connected with a drain electrode of the first switching tube, a source electrode of the first switching tube is respectively connected with a primary synonym end of the first forward transformer and a drain electrode of the second switching tube, the GH port is connected with an anode of the first diode through the first resistor, a cathode of the first diode is connected with a grid electrode of the first switching tube, the GH port is connected with a base electrode of the first triode through the second resistor, a collector electrode of the first triode is connected with a cathode of the first diode, an emitter electrode of the first triode is connected with the SH port, an anode of the second diode is connected with the GH port, a cathode of the second diode is connected with a base electrode of the first triode, and the SH port is connected with a grid electrode of the first switching tube through the third resistor;
the primary synonym end of the first transformer is connected with the drain electrode of the second switch tube, the source electrode of the second switch tube is connected with the primary synonym end of the first transformer through a first capacitor, the GL port is connected with the anode of a third diode through a fourth resistor, the cathode of the third diode is connected with the grid electrode of the second switch tube, the GL port is connected with the base electrode of the second triode through a fifth resistor, the emitter electrode of the second triode is respectively connected with the source electrode of the second switch tube and the ground, the collector electrode of the second triode is connected with the grid electrode of the second switch tube, the anode of the fourth diode is connected with the GL port, the cathode of the fourth diode is connected with the base electrode of the second triode, and a sixth resistor is connected in series between the grid electrode and the source electrode of the second switch tube.
2. The AC-DC power switching circuit according to claim 1, wherein the synchronous rectification module comprises a third switching tube, a fourth switching tube, an SR2G port, an SR1DS port, an SR1G port, a VO + port and a VO-port, a source of the third switching tube is connected with a secondary dotted terminal of the first transformer, a drain of the third switching tube is connected with the VO-port, a seventh resistor is connected in series between a gate and a drain of the third switching tube, the SR2G port is connected with the gate of the third switching tube through an eighth resistor, the SR2G port is connected with a cathode of a fifth diode, and an anode of the fifth diode is connected with the gate of the third switching tube;
the SR1DS port is connected with the second dotted terminal of the first transformer through a ninth resistor, the SR1DS port is connected with the VO-port through a tenth resistor, and the tenth resistor is connected with a second capacitor in parallel;
the source electrode of the fourth switch tube is connected with the second synonym end of the first transformer, the drain electrode of the fourth switch tube is connected with the VO-port, an eleventh resistor is connected in series between the grid electrode and the drain electrode of the fourth switch tube, the SR1G port is connected with the grid electrode of the fourth switch tube through a twelfth resistor, the SR1G port is connected with the cathode of the sixth diode, and the anode of the sixth diode is connected with the grid electrode of the fourth switch tube.
3. The AC-DC power switching circuit of claim 2, wherein the EMI filter module comprises an AC + port, an AC-port, a second transformer, a rectifier, and a ntc thermistor, a third capacitor and a fourth capacitor are connected in parallel between the AC + port and the AC-port, the AC + port and the AC-port are respectively connected to a dotted terminal of the second transformer, a fifth capacitor and a sixth capacitor are connected in series and then connected in parallel between dotted terminals of the second transformer, a seventh capacitor is connected in parallel between dotted terminals of the second transformer, a dotted terminal of the second transformer is connected to an input terminal of the rectifier, a first output terminal of the rectifier is connected to a VI + port through the ntc thermistor, a second output terminal of the rectifier is grounded, and an eighth capacitor is connected between the VI + port and ground.
4. The AC-DC power switch circuit of claim 3, wherein the LLC driving module comprises a third transformer, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, the PROUT1 port of the control module is connected to the base of the third transistor and the base of the fifth transistor through a thirteenth resistor and a fifteenth resistor, respectively, and the PROUT2 port of the control module is connected to the base of the fourth transistor and the base of the sixth transistor through a fourteenth resistor and a seventeenth resistor, respectively; the collector electrode of the third triode is connected with the emitter electrode of the fourth triode; an emitter electrode of the third triode is connected with a collector electrode of the fifth triode, an emitter electrode of the fifth triode is connected with a collector electrode of the sixth triode, and an emitter electrode of the sixth triode is connected with a collector electrode of the fourth triode; a collector of the third triode is grounded through a ninth capacitor, the collector of the third triode is connected with the auxiliary power supply through a sixteenth resistor, a primary homonymy end of the third transformer is connected with an emitter of the third triode, and a primary synonym end of the third transformer is connected with a collector of the fourth triode; the first secondary homonymous end of the third transformer is connected with a GL port, the first secondary synonym end of the third transformer is grounded, the second secondary homonymous end of the third transformer is connected with a GH port, and the second secondary synonym end of the third transformer is connected with an SH port.
5. The AC-DC power switching circuit of claim 4, wherein said commutation driving module comprises a fourth transformer, a seventh triode, an eighth triode, a ninth triode and a thirteenth triode, the PROUT3 port of said control module is connected to the base of said seventh triode and the base of said ninth triode through an eighteenth resistor and a twentieth resistor, respectively, and the PROUT4 port of said control module is connected to the base of said eighth triode and the base of said thirteenth triode through a nineteenth resistor and a twenty-first resistor, respectively; the collector electrode of the seventh triode is connected with the emitter electrode of the eighth triode; an emitter electrode of the seventh triode is connected with a collector electrode of the ninth triode, an emitter electrode of the ninth triode is connected with a collector electrode of the thirteenth triode, and an emitter electrode of the thirteenth triode is connected with a collector electrode of the eighth triode; a collector of the seventh triode is grounded through a tenth capacitor, the collector of the seventh triode is connected with the auxiliary power supply through a twelfth resistor, a primary homonymous end of the fourth transformer is connected with an emitter of the seventh triode, and a primary heteronymous end of the fourth transformer is connected with a collector of the eighth triode; the first secondary dotted terminal of the fourth transformer is connected with the SR1G port, the first secondary different-dotted terminal of the fourth transformer is grounded, the second secondary dotted terminal of the fourth transformer is connected with the SR2G port, and the second secondary different-dotted terminal of the fourth transformer is grounded.
6. An AC-DC power switching circuit according to claim 5 wherein the control module employs peak current mode as the LLC control mode, the control module employs current charge control, a ramp compensation signal is integrated within the control module, and the switching frequency is adjusted by comparing the control voltage of the total charge of the switching current (integrated switching current).
7. The AC-DC power switching circuit according to claim 6, wherein the control module employs hybrid control, uses pulse width modulation and turns off the synchronous rectification module at light loads; at heavy loads, a pulse frequency modulation mode is used.
8. The AC-DC power switching circuit according to claim 7, wherein the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all N-channel enhancement type MOS tubes; the rectifier is an RS809 type rectifier; the third triode, the fifth triode, the seventh triode and the ninth triode are all NPN type triodes, and the fourth triode, the sixth triode, the eighth triode and the thirteenth triode are all PNP type triodes; the control module adopts a FAN7688 type control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299942.9A CN111146963A (en) | 2018-11-02 | 2018-11-02 | AC-DC power switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299942.9A CN111146963A (en) | 2018-11-02 | 2018-11-02 | AC-DC power switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111146963A true CN111146963A (en) | 2020-05-12 |
Family
ID=70516210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811299942.9A Pending CN111146963A (en) | 2018-11-02 | 2018-11-02 | AC-DC power switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111146963A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7193866B1 (en) * | 2006-05-09 | 2007-03-20 | Ming-Ho Huang | Half-bridge LLC resonant converter with a synchronous rectification function |
| US20120320633A1 (en) * | 2011-06-16 | 2012-12-20 | Chang-Hsing Chen | Variable frequency pwm synchronous rectifier power supply |
| CN106655837A (en) * | 2016-11-20 | 2017-05-10 | 徐云鹏 | NEXT series AC-DC power switching circuit |
-
2018
- 2018-11-02 CN CN201811299942.9A patent/CN111146963A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7193866B1 (en) * | 2006-05-09 | 2007-03-20 | Ming-Ho Huang | Half-bridge LLC resonant converter with a synchronous rectification function |
| US20120320633A1 (en) * | 2011-06-16 | 2012-12-20 | Chang-Hsing Chen | Variable frequency pwm synchronous rectifier power supply |
| CN106655837A (en) * | 2016-11-20 | 2017-05-10 | 徐云鹏 | NEXT series AC-DC power switching circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108512431B (en) | Double rectification alternating expression full-bridge single stage power factor correction power circuits and control method | |
| CN105846682B (en) | Novel hybrid control mode of forward and reverse converter | |
| US8009448B2 (en) | Forward-flyback converter with active-clamp circuit | |
| CN108964474B (en) | Three-mode rectification topological structure based on LLC resonant converter | |
| CN102263515B (en) | AC-DC (alternating current-direct current) power conversion chip and power conversion circuit | |
| CN104158400A (en) | Modularized high-pressure power supply circuit | |
| CN111010043B (en) | Full-bridge LLC resonant converter fixed-frequency control method | |
| CN104682745A (en) | Isolated voltage conversion circuit, control circuit and control method thereof | |
| CN201234208Y (en) | Switch power supply for chain type convertor power unit controller | |
| CN103248108A (en) | LED (Light Emitting Diode) driver with MOS (Metal Oxide Semiconductor) tube switching module and reusable DC (Direct Current)-DC (Direct Current) module | |
| CN203225573U (en) | Power-storing LED driver employing switching MOS tube and DC-DC module capable of multiplexing | |
| CN111725993B (en) | High-efficiency Sepic soft switch converter and control method thereof | |
| CN102665322B (en) | Driving power supply without electrolytic capacitor | |
| Brunoro et al. | A high-performance ZVS full-bridge DC-DC 0-50-V/0-10-A power supply with phase-shift control | |
| CN112436728B (en) | High-efficiency control method of bidirectional resonant converter | |
| CN107370404A (en) | Integrated PFC high voltage half-bridge resonance synchronous rectification AC/DC power modules | |
| CN201976292U (en) | High-efficiency solar energy illuminating system | |
| CN105407583A (en) | Single-pole quasi-resonance LED driving device based on Buck-Boost circuit and Flyback circuit | |
| CN108736756B (en) | Improved double-auxiliary resonant-pole three-phase soft switching inverter circuit | |
| CN110445387B (en) | Topological structure and control method of formation and grading power supply | |
| CN109698627B (en) | Full-bridge DC/DC converter based on switched capacitor and modulation strategy thereof | |
| US11323037B2 (en) | Forward converter with secondary LCD connected in series to realize excitation energy transfer | |
| CN115811241B (en) | Mixed control method for single-stage bridgeless staggered parallel Boost-LLC AC-DC converter | |
| CN106655837A (en) | NEXT series AC-DC power switching circuit | |
| CN202178715U (en) | AC-DC power conversion chip and power conversion circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200512 |
|
| WD01 | Invention patent application deemed withdrawn after publication |