CN104638950A - AC/DC converting device and operation method thereof - Google Patents

AC/DC converting device and operation method thereof Download PDF

Info

Publication number
CN104638950A
CN104638950A CN201310554566.4A CN201310554566A CN104638950A CN 104638950 A CN104638950 A CN 104638950A CN 201310554566 A CN201310554566 A CN 201310554566A CN 104638950 A CN104638950 A CN 104638950A
Authority
CN
China
Prior art keywords
coupled
energy
storage units
output switch
secondary side
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
Application number
CN201310554566.4A
Other languages
Chinese (zh)
Inventor
王颖翔
林哲立
颜志仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novatek Microelectronics Corp
Original Assignee
Novatek Microelectronics Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Novatek Microelectronics Corp filed Critical Novatek Microelectronics Corp
Priority to CN201310554566.4A priority Critical patent/CN104638950A/en
Publication of CN104638950A publication Critical patent/CN104638950A/en
Pending legal-status Critical Current

Links

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
    • H02M7/23—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 arranged for operation in parallel

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides an AC/DC converting device and an operation method thereof. The device comprises a transformer, a first energy storage unit, a first output switch, a second energy storage unit, a second output switch and a secondary side control module; the transformer comprises a primary side winding and a secondary side winding; the first output switch is coupled between the secondary side winding and the first energy storage unit; the second output switch is coupled between the secondary side winding and the second energy storage unit; the secondary side control module monitors the first and second energy storage units and determines the time of conducting periods of the first and second output switches according to the monitoring results respectively.

Description

AC/DC conversion equipment and method of operation thereof
Technical field
The invention relates to a kind of supply of electric power circuit, and relate to a kind of AC/DC conversion equipment and method of operation thereof especially.
Background technology
Electronic installation internal circuit now often uses the direct voltage of multiple different voltage level, therefore arranges AC-DC converter in electronic installation of being everlasting with power supply to described internal circuit.Civil power (alternating current) can be converted to direct current by AC-DC converter, can allow electronic installation obtain operate needed for direct voltage.Fig. 1 is the circuit diagram of known direction flyback converter (Flyback Converter).Known direction flyback converter includes transformer 110, rectifier diode 131 and output capacitance 132.The first end of the secondary side winding (secondary-side winding) 112 of transformer 110 and the second end are coupled to anode and the reference voltage of rectifier diode 131 respectively.The two ends of output capacitance 132 are coupled to negative electrode and the reference voltage of rectifier diode 131 respectively.
Civil power provides AC energy to rectifier 120.Rectifier 120 transfers to the first side winding (primary-side winding) 111 of transformer 110 after converting AC energy to direct current.Transistor 140 control end is coupled to and controls turning circuit 150.When transistor 140 conducting, the electrical power storage that rectifier 120 exports is in the first side winding 111 of transformer 110.When transistor 140 ends, electric energy transfers to secondary side winding 112 from the first side winding 111 of transformer 110, makes rectifier diode 131 forward conducting and charging to output capacitance 132, and produces the first output voltage at the first output OUT_HV.Control turning circuit 150 can adjust the first output OUT_HV voltage level by the ON time controlling transistor 140, and then the voltage of optimization (Optimal) first output OUT_HV.
Only, utilize same winding to produce the output voltage of multiple different size as wanted, known transition circuit must configure corresponding voltage transducer with further by the voltage transitions of the first output OUT_HV for other target voltage.Such as, direction flyback converter shown in Fig. 1 makes the voltage of the first output OUT_HV be maintained at A volt through setting.Transducer 160 (such as Boost converter) can by the boost in voltage of the first output OUT_HV to B volt to supply power to the second output OUT_LED.But the transducer 160 of additional configuration improves except making cost, and conversion efficiency also can reduce.Moreover known direction flyback converter shown in Fig. 1 can only carry out optimization to the voltage of the first output OUT_HV, and can not do optimization to first output voltage of the first output OUT_HV and second output voltage of the second output OUT_LED simultaneously.
The above is all existing technology and does not attain desirable part, needs to be further reviewed in fact, and seeks feasible solution.
Summary of the invention
The present invention proposes a kind of AC/DC conversion equipment and method of operation thereof, and it can utilize same winding to produce the output voltage of multiple different size.
The embodiment of the present invention proposes a kind of AC/DC conversion equipment, comprises transformer, the first energy-storage units, the first output switch, the second energy-storage units, the second output switch and secondary side control module.Transformer comprises at least one first side winding (primary-side winding) and at least one secondary side winding (secondary-side winding).The first end of the first output switch and the second end are coupled to the first end of the first energy-storage units and secondary side winding respectively.The first end of the second output switch and the second end are coupled to the described first end of described second energy-storage units and described secondary side winding respectively.Secondary side control module is coupled to the first energy-storage units to monitor the first electrical property feature of the first energy-storage units, and is coupled to the second energy-storage units to monitor the second electrical property feature of the second energy-storage units.According to the monitoring result to described first electrical property feature, correspondence determines the time span of the conduction period of the first output switch to described secondary side control module, and correspondence determines that the time of the conduction period of the second output switch is long according to the monitoring result to described second electrical property feature.
The embodiment of the present invention provides a kind of method of operation of AC/DC conversion equipment, comprises the following steps.In AC/DC conversion equipment configuration transformer, wherein transformer comprises at least one first side winding and at least one secondary side winding.Configure the first energy-storage units and the first output switch in AC/DC conversion equipment, wherein the first end of the first output switch and the second end are coupled to first end and first energy-storage units of secondary side winding respectively.Configure the second energy-storage units and the second output switch in AC/DC conversion equipment, wherein the first end of the second output switch and the second end are coupled to the first end of the second energy-storage units and secondary side winding respectively.In conduction period of the first output switch by delivery of electrical energy to the first energy-storage units stored by transformer, and monitor the first electrical property feature of the first energy-storage units, and correspondence determines the time span of the conduction period of the first output switch according to the monitoring result to the first electrical property feature.In conduction period of the second output switch by delivery of electrical energy to the second energy-storage units stored by transformer, and monitor the second electrical property feature of the second energy-storage units, and correspondence determines the time span of the conduction period of the second output switch according to the monitoring result to the second electrical property feature.
Based on above-mentioned, the invention provides a kind of AC/DC conversion equipment and method of operation thereof, this AC/DC conversion equipment uses secondary side control module to monitor the first energy-storage units and the second energy-storage units, and the ON time length of the first output switch and the second output switch is determined according to monitoring result, therefore the same secondary side winding of transformer only need be used can to produce the output voltage that many groups can be made optimization and accurate adjustment, and do not need to configure extra electric pressure converter.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate institute's accompanying drawings to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing AC-DC converter.
Fig. 2 illustrates the schematic diagram of the AC/DC conversion equipment into the present invention one one exemplary embodiment.
The flow chart of AC/DC conversion device operation method of Fig. 3 for illustrating according to the present invention one one exemplary embodiment.
Fig. 4 illustrates the first embodiment schematic diagram of the AC/DC conversion equipment into Fig. 2.
Fig. 5 is oscillogram illustrated according to a first embodiment of the present invention.
Fig. 6 illustrates the second embodiment schematic diagram of the AC/DC conversion equipment into Fig. 2.
Fig. 7 illustrates the 3rd embodiment schematic diagram of the AC/DC conversion equipment into Fig. 2.
Fig. 8 illustrates the 4th embodiment schematic diagram of the AC/DC conversion equipment into Fig. 2.
[label declaration]
Embodiment
With detailed reference to one exemplary embodiment of the present invention, the example of described one exemplary embodiment is described in the accompanying drawings.Use in this case specification in full (comprising claim) " coupling " one word can refer to any connection means directly or indirectly.For example, if describe first device in literary composition to be coupled to the second device, then should be construed as this first device and can be directly connected in this second device, or this first device can be connected to this second device indirectly by other device or certain connection means.In addition, all may part, in graphic and execution mode, use the element/component/step of identical label to represent identical or similar portions.Use identical label in different embodiment or use the element/component/step of identical term can cross-referenced related description.
Fig. 2 illustrates the schematic diagram of the AC/DC conversion equipment 20 into the present invention one one exemplary embodiment.AC/DC conversion equipment 20 is coupled between AC power 30 and load 41,42.AC/DC conversion equipment 20 comprises transformer T1, energy-storage units 220, output switch 230, energy-storage units 240 and output switch 250.In this exemplary embodiment, the topological kenel (topology) of AC/DC conversion equipment 20 can be flyback (flyback) Power convert topology, but is not restricted to this.
Transformer T1 comprises at least one first side winding 211 and at least one secondary side winding 212.In this exemplary embodiment, the electric energy of AC power 30 transfers to the first side winding 211 of transformer T1 via primary side circuit 270.The first end of output switch 230 is coupled to energy-storage units 220, and the second end of output switch 230 is coupled to the first end of secondary side winding 212.The first end of output switch 250 is coupled to energy-storage units 240, and the second end of output switch 250 is coupled to the first end of described secondary side winding 212.In this exemplary embodiment, the first end of first side winding 211 and the second end are respectively Same Name of Ends (common-polarity terminal, i.e. dotted end) and different name end (opposite-polarity terminal, i.e. non-dotted end), first end and second end of secondary side winding 212 are respectively different name end and Same Name of Ends.
Secondary side control module 260 is coupled to energy-storage units 220 to monitor an electrical property feature of energy-storage units 220, and is coupled to described energy-storage units 240 to monitor an electrical property feature of energy-storage units 240.In this exemplary embodiment, the electrical property feature of energy-storage units 220 can be the voltage difference of energy-storage units 220 and secondary side reference voltage (such as secondary side earthed voltage), the electrical property feature of energy-storage units 240 can be the voltage difference of energy-storage units 240 and secondary side reference voltage, but is not restricted to this.Secondary side control module 260 is the corresponding time span determining the conduction period of described output switch 230 according to the monitoring result of the described electrical property feature to energy-storage units 220, and correspondence determines the time span of the conduction period of output switch 250 according to the monitoring result to the described electrical property feature of energy-storage units 240.
Fig. 3 is the flow chart of AC/DC conversion equipment 20 according to the present invention one one exemplary embodiment key diagram 2.Referring to Fig. 2 and Fig. 3, in the conduction period of output switch 230, the electric energy stored by transformer T1 is transferred to energy-storage units 220, and secondary side control module 260 monitors the electrical property feature (step S310) of energy-storage units 220.The electrical property feature of energy-storage units 220 here can be the voltage of energy-storage units 220, electric current or other electrical property feature, but is not restricted to this.Therefore, energy-storage units 220 can be powered to load 41.In step S312, secondary side control module 260 is the corresponding time span determining the conduction period of output switch 230 according to the monitoring result of the described electrical property feature to energy-storage units 220.Therefore, AC/DC conversion equipment 20 can produce through optimized accurate output voltage to load 41.
In the conduction period of output switch 250, stored by transformer T1, electric energy is transferred to energy-storage units 240, and secondary side control module 260 monitors the electrical property feature (step S314) of the energy-storage units 240 of energy-storage units 240.The electrical property feature of energy-storage units 240 here can refer to voltage, electric current or other electrical property feature on energy-storage units 240, but is not restricted to this.Therefore, energy-storage units 240 can be powered to load 42.According to the design requirement of actual product, the conduction period of described output switch 230 and the conduction period of described output switch 250 partly can overlap or not overlap mutually.In step S316, secondary side control module 260 is the corresponding time span determining the conduction period of output switch 250 according to the monitoring result of the described electrical property feature to energy-storage units 240.Therefore, AC/DC conversion equipment 20 can produce through optimized accurate output voltage to load 42.
In sum, described in the present embodiment, AC/DC conversion equipment 20 and method of operation thereof utilize the concept of Energy distribution, in the first store electrical energy of first side winding 211 of transformer T1, then the electric flux being stored in transformer T1 is sequentially dispensed to multiple outputs of AC/DC conversion equipment 20.Such as, make output switch 230 conducting and allow the electric flux being stored in transformer T1 can be dispensed to energy-storage units 220 and load 41.The present embodiment employs the electrical property feature (such as voltage) that secondary side control module 260 monitors energy-storage units 220 and energy-storage units 240, and controls the ON time length of output switch 230 and output switch 250 accordingly according to monitoring result.Such as, when the electric flux being dispensed to energy-storage units 220 arrives preset value, namely secondary side control module 260 closes output switch 230, and makes output switch 250 conducting and allow the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 240 with load 42) to next to carry out electric flux and supplement.Therefore, AC/DC conversion equipment 20 need use the same secondary side winding 212 of transformer T1 can produce the many groups of output voltages through indivedual optimization and accurate adjustment, and does not need to configure extra electric pressure converter.
Fig. 4 is the first embodiment schematic diagram illustrating the AC/DC conversion equipment 20 of Fig. 2 according to the embodiment of the present invention.Described AC/DC conversion equipment 20 is coupled between AC power 30 and load 41,42,43.Load 42 is such as light-emitting diode string.In this embodiment, secondary side control module 260 can comprise induction of signal and regulate (Sensor Signal Conditioner) integrated circuit 261 and comparator OP1, but be not restricted to this, also can be error amplifier (Error Amplifier) in other embodiments or other can judge the feedback adjusting form of output voltage.The output of comparator OP1 is coupled to induction of signal and regulates integrated circuit 261, and induction of signal regulates integrated circuit 261 to be coupled to observation station Sync.
In this embodiment, energy-storage units 220 is for electric capacity C1, and output switch 230 can be the switch of transistor, conducting door (transmission gate) or other kind, but is not limited thereto.The first end of output switch 230 is coupled to secondary side winding 212 first end.Second end of output switch 230 is coupled to the first end of electric capacity C1, and the induction of signal that the control end of output switch 230 is coupled to secondary side control module 260 regulates integrated circuit 261.Second end of electric capacity C1 is coupled to secondary side reference voltage (such as secondary side earthed voltage or other fixed voltage).Energy-storage units 240 is for electric capacity C2 in this embodiment, and output switch 250 can be the switch of transistor, conducting door or other kind, but is not limited thereto.The first end of output switch 250 and the second end are coupled to the first end of secondary side winding 212 first end and electric capacity C2 respectively, and the induction of signal that the control end of output switch 250 is coupled to secondary side control module 260 regulates integrated circuit 261.Second end of electric capacity C2 is coupled to secondary side reference voltage.In this embodiment, the quantity of described secondary side winding 212 is one, but is not limited thereto, and the quantity of described secondary side winding 212 also can be multiple.
AC/DC conversion equipment 20 comprises synchronous rectification unit 281, energy-storage units 282 and output switch 283 further in this embodiment.In this embodiment, energy-storage units 282 is for electric capacity C3, and output switch 283 can be the switch of transistor, conducting door or other kind, but is not limited thereto.The first end of output switch 283 is coupled to the first end of secondary side winding 212, and the second end of output switch 283 is coupled to the first end of electric capacity C3, and second end of electric capacity C3 then couples with secondary side reference voltage.Synchronous rectification unit 281 comprises synchronous rectification switch in this embodiment, and this synchronous rectification switch is transistor Q1 in this embodiment, but is not limited thereto.The first end of transistor Q1 and the second end are coupled to the second end and the secondary side reference voltage (such as secondary side earthed voltage or other fixed voltage) of secondary side winding 212 respectively, and the induction of signal that the control end of transistor Q1 (grid) is coupled to secondary side control module 260 regulates integrated circuit 261.In this embodiment, the induction of signal of secondary side control module 260 regulates integrated circuit 261 to be coupled to second end (i.e. observation station Sync) of secondary side winding 212 to monitor a voltage characteristic, wherein the conducting state of secondary side control module 260 corresponding control described output switch 230, output switch 250 and/or output switch 283 according to the monitoring result to described voltage characteristic.
In this embodiment, energy-storage units 240 is powered to a current path of load 42, and AC/DC conversion equipment 20 comprises current detector 284 further.Current detector 284 is configured to detect the electric current of load 42 in the current path of load 42, and exports a current detecting result to secondary side control module 260.Current detector 284 is connected with load 42 in this embodiment.Wherein first non-inverting input of the comparator OP1 of secondary side control module 260 is coupled to current detector 284, to receive described current detecting result.The inverting input of comparator OP1 receives reference voltage Vref.Comparator OP1 can compare the current detecting result and reference voltage Vref that current detector 284 exports, and comparative result is sent to induction of signal and regulates integrated circuit 261.Induction of signal regulates the integrated circuit 261 current detecting result that can export according to current detector 284 and the relation of both reference voltage Vref and the corresponding time span adjusting the conduction period of output switch 250.Therefore, secondary side control module 260 can correspondingly according to described current detecting result (namely to the monitoring result of the described electrical property feature of energy-storage units 240) control and the ON time length determining described output switch 250.According to this, AC/DC conversion equipment 20 can carry out optimization to the output electric energy of energy-storage units 240.
The first end of energy-storage units 220 is coupled to second non-inverting input of the comparator OP1 of secondary side control module 260.Comparator OP1 can compare electrical property feature and the reference voltage Vref of the first end of energy-storage units 220, and comparative result is sent to induction of signal adjustment integrated circuit 261.Though the second non-inverting input by comparator OP1 embodiment illustrated in fig. 4 is directly coupled to the first end of energy-storage units 220, but implementation of the present invention should not as limit.Such as, in other embodiments, second non-inverting input of comparator OP1 to energy-storage units 220 first end between can configure bleeder circuit, wherein the voltage of the first end of energy-storage units 220 is carried out dividing potential drop and produces second non-inverting input of feedback voltage to comparator OP1 by this bleeder circuit.Therefore, induction of signal regulate integrated circuit 261 can according to the electrical property feature of the first end of energy-storage units 220 and the relation of both reference voltage Vref the corresponding time span adjusting the conduction period of output switch 230.Therefore, secondary side control module 260 can correspondingly according to the monitoring result of the electrical property feature to energy-storage units 220 control and the ON time length determining described output switch 230.According to this, AC/DC conversion equipment 20 can carry out optimization to the output electric energy of energy-storage units 220.
And primary side circuit 270 includes rectification circuit 271, primary side control switch 272 and primary side control module 273 further in this embodiment.First DC terminal of rectification circuit 271 and the second DC terminal are coupled to first end and the primary side reference voltage (such as primary side earthed voltage) of described first side winding 211 respectively, and first of rectification circuit 271 exchanges end and exchange to hold with second and be coupled to AC power 30 respectively.Rectification circuit 271 can convert the alternating current inputted from AC power 30 to direct current.Primary side control switch 272, but to be not limited thereto for transistor Q2 in this embodiment.The first end of transistor Q2 and the second end are coupled to the second end and the primary side reference voltage of first side winding 211 respectively.Primary side control module 273 couples the control end of the transistor Q2 of primary side control switch 272, and primary side control module 273 is by controlling the time span of the conduction period of the transistor Q2 of primary side control switch 272, decides the electric flux being stored in transformer T1.Secondary side control module 260 decides the electric flux discharged from transformer T1 by the time span of the conduction period controlling output switch 230, output switch 250 and output switch 283.Primary side control module 273 and described secondary side control module 260 can be configured in same integrated circuit, are also configurable in different integrated circuit.Such as, in certain embodiments, the function of primary side control module 273 can by whole and in secondary side control module 260, to save the control module of primary side shown in Fig. 4 273.In other embodiments, output switch 230, output switch 250, output switch 283 and the design requirement of the transistor Q1 as synchronous rectification switch also visual actual product and be integrated into induction of signal and regulate in integrated circuit 261.
Fig. 5 is the oscillogram of first embodiment of the invention.Referring to Fig. 4 and Fig. 5, below explain the process of this AC/DC conversion equipment 20 running.Signal VG represents the control end current potential of primary side control switch 272.When signal VG is high-voltage level, represent primary side control switch 272 conducting; When signal VG is low voltage level, then represent primary side control switch 272 not conducting.During time point t1 to t2, primary side control switch 272 conducting, makes the electric current I p in now first side winding 211 increase.That is, primary side circuit 270 during time point t1 to t2 by electrical power storage at transformer T1.During time point t1 to t2, the control end current potential VSW_SR of transistor Q1, the control end current potential VSW_1 of output switch 230, the control end current potential VSW_2 of output switch 250 and the control end current potential VSW_3 of output switch 283 are all low voltage level, represent as the transistor Q1 of synchronous rectification switch, output switch 230, output switch 250, all non-conducting of output switch 283.The electrical power storage that between charge period, rectification circuit 271 is exported by conducting primary side control switch 272 by (namely during time point t1 to t2) is at transformer T1.
After terminating between charge period, then enter (namely during time point t2 to t5) during releasing energy.During time point t2 to t5, signal VG reduces to low voltage level, makes primary side control switch 272 not conducting.During time point t2 to t5, the control end current potential VSW_SR of the transistor Q1 of synchronous rectification switch becomes high level from low level, makes transistor Q1 conducting, in order to being stored in the power distribution of transformer T1 to energy-storage units 220,240 and 282.When the Q1 conducting of time point t2 transistor, the voltage of observation station Sync drops to negative voltage because of the electromotive force of secondary side winding 212 and lower than a preset reference value, such as-0.7V.The voltage level of observation station Sync is stored in the amount of electric energy in transformer T1 in response to (being relevant to), therefore secondary side control module 260 can judge the amount being stored in electric energy in transformer T1 according to the voltage level of observation station Sync.When the induction of signal of secondary side control module 260 regulates integrated circuit 261 to receive the voltage of observation station Sync lower than described preset reference value, just export a Continuity signal to the output switch needing conducting at first during time point t2 to t5.At the output switch that this embodiment output switch 250 is conducting at first, but be not restricted to this.When observation station Sync voltage is negative voltage level, secondary side control module 260 turn in order output switch 250, output switch 230 and output switch 283, to be dispensed to energy-storage units 240 (with load 42), energy-storage units 220 (with load 41) and energy-storage units 282 (with load 43) by the electric flux being stored in transformer T1.Details are as follows for mode of operation during time point t2 to t5.
During time point t2 to t3, induction of signal regulates integrated circuit 261 to draw high output switch 250 control end current potential VSW_2 into high level, makes output switch 250 conducting.Therefore, the electric energy being stored in transformer T1 can distribute to energy-storage units 240 and load 42 during time point t2 to t3, makes the electric current I s in secondary side winding 212 reduce (as shown in Figure 5).During output switch 250 conducting, secondary side control module 260 is monitored the voltage of energy-storage units 240 and/or is flowed through the electric current of load 42, to carry out optimization to the output electric energy of energy-storage units 240.When the electric flux being dispensed to energy-storage units 240 arrives preset value, such as when the voltage of energy-storage units 240 reaches the rated voltage level of load 42 and/or when reaching the nominal current level of load 42 when the electric current flowing through load 42, namely secondary side control module 260 closes output switch 250, and makes output switch 230 conducting (during entry time point t3 to t4) and allow the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 220 with load 41) to next to carry out electric flux and supplement.
Induction of signal regulates integrated circuit 261 to draw high as high-voltage level by the control end current potential VSW_1 of output switch 230 during time point t3 to t4, makes output switch 230 conducting during time point t3 to t4.Therefore, the electric energy being stored in transformer T1 can distribute to energy-storage units 220 and load 41 during time point t3 to t4, and the electric current I s in secondary side winding 212 is reduced.During output switch 230 conducting, secondary side control module 260 monitors the voltage of energy-storage units 220, to carry out optimization to the output electric energy of energy-storage units 220.When the electric flux being dispensed to energy-storage units 220 arrives preset value, such as when the voltage of energy-storage units 220 reaches the rated voltage level of load 41, namely secondary side control module 260 closes output switch 230, and makes output switch 283 conducting (during entry time point t4 to t5) and allow the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 282 with load 43) to next to carry out electric flux and supplement.
Induction of signal regulates integrated circuit 261 to draw high as high-voltage level by the control end current potential VSW_3 of output switch 283 during time point t4 to t5, makes output switch 283 conducting during time point t4 to t5.Therefore, the electric energy being stored in transformer T1 can distribute to energy-storage units 282 and load 43 during time point t4 to t5, and the electric current I s in secondary side winding 212 is reduced.During output switch 283 conducting, secondary side control module 260 monitors the voltage of energy-storage units 282, to carry out optimization to the output electric energy of energy-storage units 282.When the electric flux being dispensed to energy-storage units 282 arrives preset value, such as, when the voltage of energy-storage units 282 reaches the rated voltage level of load 43, namely secondary side control module 260 closes output switch 283.
By observing the voltage (such as shown in Fig. 5) of common voltage observation station VCOM in circuit shown in Fig. 4, can know that AC/DC conversion equipment 20 can adjust individually the voltage of the voltage of the voltage of energy-storage units 220, energy-storage units 240 and energy-storage units 282, and not need to configure extra electric pressure converter.Therefore, AC/DC conversion equipment 20 uses the same secondary side winding of transformer can produce the output voltage that many groups can be made optimization and accurate adjustment.
In this embodiment, the conduction period of (namely during time point t1 to t2), the conduction period of output switch 230 between charge period, the conduction period of output switch 250 and output switch 283 does not overlap mutually.The action of output switch 230, output switch 250 and output switch 283 is each other without dependence.But embodiments of the present invention should not be limited to this.Such as in other embodiments, the conduction period of switch 230,250 and 283 also can be set to depending on actual design/application demand partly overlap each other.Again such as, although embodiment illustrated in fig. 5 be by output switch 250, output switch 230 and the order turn in order of output switch 283, also can use other sequential turn-on depending on actual design/application demand in other embodiment.Such as turn in order output switch 230, output switch 250 and output switch 283.
Please refer to Fig. 5, in the present embodiment, during to first power stage passage electric energy supplement at the end of (namely during time point t2 to t3), observation station Sync voltage rise is to-310mV (be only example, but be not restricted to this).During to second power stage passage electric energy supplement at the end of (namely during time point t3 to t4), observation station Sync voltage rise is to-12mV (be only example, but be not restricted to this).And work as at the end of (namely during time point t4 to t5) during the 3rd power stage passage electric energy supplement, observation station Sync voltage rise is to 0V (be only example, but be not restricted to this).Observe this phenomenon can learn, the voltage level of observation station Sync is stored in the surplus of electric energy in transformer T1 in response to (being relevant to).Therefore, secondary side control module 260 can judge during releasing energy according to the voltage level of observation station Sync at the end of, (such as the t5 of time point shown in Fig. 5) is stored in the surplus of electric energy in transformer T1, and the surplus of electric energy in transformer T1 is informed primary side control module 273.Primary side control module 273 can carry out the ON time length of corresponding adjustment primary side control switch 272 according to the surplus of electric energy in transformer T1 at the end of during releasing energy, namely adjusts the time span of (such as during the t1 to t2 of time point shown in Fig. 5) between charge period.
Fig. 6 is the second embodiment schematic diagram illustrating the AC/DC conversion equipment 20 of Fig. 2 according to the embodiment of the present invention.Embodiment illustrated in fig. 6ly can analogize it with reference to the related description of Fig. 4 to Fig. 5.In this is embodiment illustrated in fig. 6, this AC/DC conversion equipment 20 can comprise a feedback module 285 further.The sense terminals of feedback module 285 is coupled to energy-storage units 240, to monitor the electrical property feature of energy-storage units 240.In this embodiment, the 3rd electrical property feature is the voltage on energy-storage units 240.The output of feedback module 285 is coupled to primary side control module 273 to provide a corresponding informance of the electrical property feature of energy-storage units 240.Primary side control module 273 is corresponding according to described corresponding informance to be controlled and the ON time length determining primary side control switch 272.
In this embodiment, feedback module 285 comprises optical coupler PC1, resistance R1 ~ R3, electric capacity C4 and C5 and Zener diode ZD1.The first end of resistance R1 is coupled to energy-storage units 240.The first end of resistance R2 and the second end are coupled to the second end and the secondary side reference voltage (such as secondary side earthed voltage or other fixed voltage) of resistance R1 respectively.The first end of resistance R3 is coupled to energy-storage units 240.The first end of resistance R3 is the sense terminals of feedback module 285.Electric capacity C4 first end is coupled to second end of resistance R1.The negative electrode of Zener diode ZD1 is coupled to second end of described electric capacity C4, and the anode of Zener diode ZD1 is coupled to secondary side reference voltage.And the reference edge of Zener diode ZD1 is coupled to second end of resistance R1 and the first end of resistance R2.Zener diode ZD1 model can be the TL431 Zener diode of Texas Instrument or other label in this embodiment, but is not restricted to this.The first end of the illuminating part of optical coupler PC1 is coupled to second end of resistance R3, and the second end of the illuminating part of optical coupler PC1 is coupled to second end of electric capacity C4.The first end of the photographic department of optical coupler PC1 is coupled to primary side control module 273 to provide described corresponding informance, and the first end of the illuminating part of optical coupler PC1 is the output of feedback module 285.Second end of the photographic department of optical coupler PC1 is coupled to primary side reference voltage.The first end of electric capacity C5 is coupled to the first end of the photographic department of optical coupler PC1, and second end of electric capacity C5 is coupled to the second end of the photographic department of optical coupler PC1.
When the sense terminals of feedback module 285 senses the voltage on energy-storage units 240, electric current can flow through illuminating part and the Zener diode ZD1 of optical coupler PC1.When the voltage on energy-storage units 240 changes, then the electric current flowing through the illuminating part of optical coupler PC1 changes, and allows the luminous intensity of illuminating part do corresponding change.The output voltage that feedback module 285 exports primary side control module 273 to also can change thereupon, and then changes the ON time of primary side control switch 272.Such as, when the voltage on energy-storage units 240 becomes large, then the dividing potential drop of resistance R1 and resistance R2 becomes large.The voltage of Zener diode ZD1 reference edge increases, therefore the ER effect flowing through the illuminating part of Zener diode ZD1 and optical coupler PC1 is large.So the luminous intensity of optical coupler PC1 illuminating part increases, the output voltage of feedback module 285 output is increased.Primary side control module 273 receives increases the ON time that output voltage then reduces primary side control switch 272.Use the exportable alterable of optical coupler feedback technology or can the voltage of self-optimization.In sum, the AC/DC conversion equipment 20 described in the second embodiment can use optical coupler feedback technology to feed back voltage, therefore can promote conversion efficiency of the present invention further.
Fig. 7 is the 3rd embodiment schematic diagram illustrating the AC/DC conversion equipment 20 of Fig. 2 according to the embodiment of the present invention.Embodiment illustrated in fig. 7ly can analogize it with reference to the related description of Fig. 4 to Fig. 6.In this is embodiment illustrated in fig. 7, primary side circuit 270 comprises rectification circuit 271, primary side control switch 272, filter circuit 274, chip enable (Startup) circuit 275, boost voltage circuit 276 and bradyseism circuit (snubber) 277.And in this embodiment, include energy-storage units 282, output switch 283, observation circuit 287, observation circuit 288, discharge circuit 289 and bradyseism circuit 290 further.In this embodiment, the first side winding of transformer T1 comprises the first first side winding 211 and the second first side winding (assisting winding 213 referred to here as primary side) further.This primary side is assisted winding 213 and chip enable circuit 275 to couple and is primary side adjustment (Primary-side Regulator, PSR) feedback circuit.
Rectification circuit 271 includes diode D3 ~ D6 in this embodiment.The anode of diode D3 is coupled to the negative electrode that first of rectification circuit 271 exchanges end and diode D4, and the negative electrode of diode D3 is coupled to the first DC terminal of rectification circuit 271 and the negative electrode of diode D5.The anode of diode D4 is coupled to the second DC terminal of rectification circuit 271 and the anode of diode D6.The anode of diode D5 is coupled to the negative electrode that second of rectification circuit 271 exchanges end and diode D6.The alternating current that AC power 30 provides exchanges end from first of rectification circuit 271 and exchanges to hold with second and flow into rectification circuit 271, is used after diode D3 ~ D6 process by the first DC terminal outflow direct current supply AC/DC conversion equipment 20.
Primary side assists the first end of winding 213 and the second end to be respectively different name end and Same Name of Ends in this embodiment.Primary side assists winding 213 to have two purposes, one of them makes primary side adjustment (Primary-side Regulator, PSR) feed back, another purposes is that generation one boost voltage uses for primary side control module (do not illustrate, can analogize it with reference to the related description of primary side control module 273 in figure 4).
Primary side control switch 272 comprises transistor Q2, resistance R12 and resistance R13.The first end of transistor Q2 is coupled to the second end of the first first side winding 211.The control end of transistor Q2 is coupled to primary side control module with reception control signal VSW.The first end of resistance R12 is coupled to second end of transistor Q2.Second end of resistance R12 is coupled to primary side reference voltage (such as primary side earthed voltage or other fixed voltage).The first end of resistance R13 is coupled to the control end of transistor Q2.Second end of resistance R13 is coupled to primary side reference voltage.Resistance R13 is drop-down (Pull-down) resistance, and it can allow the control end of transistor Q2 remain on current potential close to primary side reference voltage at ordinary times.The current detecting point VCS being arranged at resistance R12 first end is used to detect size of current, as excessively in electric current will start overcurrent protective device.Primary side reference voltage and secondary side reference voltage are concurrent in this embodiment, represent primary side reference voltage and are secondary side reference voltage, but in other embodiments also can not concurrent.
Filter circuit 274 comprises electric capacity C7 in this embodiment.The first end of electric capacity C7 is coupled to the first DC terminal of rectification circuit 271 and the first end of transformer T1 first side winding 211.Second end of electric capacity C7 is coupled to the second DC terminal and the primary side reference voltage of rectification circuit 271.The electric capacity of filter circuit 274 exports the noise of electric flux from the first DC terminal of rectification circuit 271 and the second DC terminal in order to filtering.
Chip enable circuit 275 two ends are coupled to the first DC terminal and the primary side control module (can analogize it with reference to the related description of primary side control module 273 in figure 4) of rectification circuit 271 respectively.In this embodiment, chip enable circuit 275 comprises resistance R14, electric capacity C8 and diode D7.The first end of resistance R14 is coupled to the first end of first side winding 211 and the first DC terminal of rectification circuit 271, and second end of resistance R14 is coupled to the power supply pin VDD of primary side control module.Power supply pin VDD can power to primary side control module (can analogize it with reference to the related description of primary side control module 273 in figure 4) and/or secondary side control module 260 (referring to Fig. 2).The negative electrode of diode D7 is coupled to second end of resistance R14.The anode of diode D7 is coupled to the first end that primary side assists winding 213.The first end of electric capacity C8 is coupled to second end of resistance R14, and second end of electric capacity C8 is coupled to primary side reference voltage.Primary side assists the second end of winding 213 to be coupled to primary side reference voltage.Resistance R14 can be pull-up (Pull-up) resistance in this embodiment, remains on high level when the power supply pin VDD of primary side control module 273 can be allowed flat.When the power source is activated, input voltage can be that electric capacity C8 charges through resistance R14.When the voltage of electric capacity C8 first end arrives startup critical voltage, primary side control module just can start.Primary side assists winding 213 also can transfer to primary side control module 273 by the voltage after diode D7 rectification, and charges to electric capacity C8.
Boost voltage circuit 276 comprises resistance R15, resistance R16 and electric capacity C9.The first end of resistance R15 is coupled to the different name end that primary side assists winding 213, and second end of resistance R15 is coupled to primary side control module (can analogize it with reference to the related description of primary side control module 273 in figure 4).The first end of resistance R16 is coupled to second end of resistance R15.Second end of resistance R16 is coupled to Same Name of Ends and primary side reference voltage that primary side assists winding 213.The first end of electric capacity C9 is coupled to resistance R16 first end, and second end of electric capacity C9 is coupled to primary side reference voltage.Boost voltage circuit 276 is configured to the boost voltage VAUX (be associated with primary side and assist winding 213 both end voltage) provided, for primary side control module.
The first end of bradyseism circuit 277 is coupled to the first end of first side winding 211.Second end of bradyseism circuit 277 is coupled to the second end of first side winding 211.The bradyseism circuit 277 of the present embodiment utilizes the circuit framework comprising resistance R17, electric capacity C10 and diode D8 to realize.The first end of resistance R17 is coupled to the first end of the first side winding 211 of rectification circuit 271 and transformer T1.The first end of electric capacity C10 is coupled to the first end of first side winding 211.Second end of electric capacity C10 is coupled to second end of resistance R17.The negative electrode of diode D8 is coupled to second end of resistance R17 and second end of electric capacity C10.The anode tap of diode D8 is coupled to the second end of the first side winding 211 of transformer T1.Specifically, bradyseism circuit 277 is energy that the leakage inductance that absorbs transformer T1 produces.
Output switch 230 is coupled to the first end of secondary side winding 212.Output switch 230 can be transistor Q3, but is not restricted to this.The electric capacity C1 of energy-storage units 220 is coupled to output switch 230.Observation circuit 287 is coupled to the electric capacity C1 of energy-storage units 220.Observation circuit 287 comprises resistance R4 and R5.The first end of resistance R4 is coupled to electric capacity C1 first end in energy-storage units 220.Second end of resistance R4 is coupled to resistance R5 first end.Resistance R5 second end is coupled to secondary side reference voltage (such as secondary side earthed voltage or other fixed voltage).Observation circuit 287 is used for the voltage of the electric capacity C1 of energy-storage units 220 to carry out dividing potential drop, and branch pressure voltage VAUDIO is sent to secondary side control module 260 (referring to Fig. 2).Secondary side control module can know the electrical property feature (such as voltage) of energy-storage units 220 according to branch pressure voltage VAUDIO.
In this embodiment, output switch 250 is diode D2, but is not limited thereto.The anode of diode D2 is coupled to the first end of secondary side winding 212, and the negative electrode of diode D2 is coupled to energy-storage units 240.When the cathode voltage of diode D2 is greater than anode voltage, diode D2 is cut-off state, and therefore diode D2 also can be considered a kind of output switch.Observation circuit 288 is coupled to the electric capacity C2 of energy-storage units 240.Observation circuit 288 comprises resistance R8 and R9.The first end of resistance R8 is coupled to electric capacity C2 first end in energy-storage units 240, and second end of resistance R8 is coupled to resistance R9 first end.Resistance R9 second end is coupled to secondary side reference voltage (such as secondary side earthed voltage or other fixed voltage).Observation circuit 288 is used for the voltage of electric capacity C2 in energy-storage units 240 to carry out dividing potential drop, and branch pressure voltage VLED is sent to secondary side control module (can analogize it with reference to the related description of secondary side control module 260 in figure 4).
The two ends of bradyseism circuit 290 are coupled to anode tap and the cathode terminal of diode D2 respectively.Bradyseism circuit 290 comprises resistance R10 and electric capacity C6.The first end of resistance R10 is coupled to the anode tap of diode D2.Second end of resistance R10 is coupled to the first end of electric capacity C6.Second end of electric capacity C6 is coupled to the cathode terminal of diode D2.Bradyseism circuit 290 can the surging that produces when switched conductive and cut-off state of filtering diode D2.
Output switch 283 is coupled to the first end of secondary side winding 212.Output switch 283 can be transistor Q4, but is not restricted to this.The electric capacity C3 of energy-storage units 282 is coupled to output switch 283.Use primary side to adjust (PSR) technology in the present embodiment control and adjust the output voltage of energy-storage units 282.This technology utilizes chip enable circuit 275 with boost voltage circuit 276, comprises diode D7, resistance R15 and R16, the circuit framework of electric capacity C8 and C9 realizes.The principle of primary side adjustment is the change in voltage of assisting winding 213 by detecting primary side, detects the situation of secondary side output voltage change.During releasing energy, the forward conduction voltage drop of output voltage and synchronous rectification unit 281 can be reflected to primary side and assist winding 213, and primary side assists winding 213 both end voltage in response to output voltage.During releasing energy, be stored in the surplus of electric energy in transformer T1, the output voltage of the output switch 283 of last conducting can be reflected in.Therefore in this embodiment, primary side assists winding 213 both end voltage to be relevant to the output voltage of the output switch 283 of last conducting.The boost voltage VAUX of winding 213 both end voltage is assisted to be fed back to primary side control module (can be analogized it with reference to the related description of primary side control module 273 in figure 4) in response to primary side.Therefore, primary side control module can adjust the time span of the conduction period of transistor Q2 in primary side control switch 272 according to boost voltage VAUX, and the time span of the conduction period of corresponding adjustment output switch 283.By using primary side adjustment feedback technique, the output voltage of the output switch 283 of last conducting can be maintained determines voltage.
In this embodiment, when switch 230 and 283 is cut-off, the electric flux being stored in transformer T1 can be transferred to energy-storage units 240, with the rated voltage (such as 55V, but being not restricted to this) making output voltage VO UT be maintained at load 42 (referring to Fig. 2).Secondary side control module 260 (referring to Fig. 2) can monitor the cross-pressure of the electric capacity C2 of energy-storage units 240 by observation circuit 288.When in energy-storage units 240, the voltage of electric capacity C2 reaches the rated voltage level of the load 42 coupled with electric capacity C2, and/or when the electric current flowing through the load 42 coupled with electric capacity C2 reaches the nominal current level of load 42, secondary side control module 260 can make output switch 230 conducting and allow the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 220 with its load) to next to carry out electric flux and supplement.Due to output switch 230 conducting, the anode voltage of diode D2 is left behind.When the cathode voltage of diode D2 is greater than anode voltage, diode D2 is cut-off state, and therefore diode D2 can keep the voltage of electric capacity C2 in energy-storage units 240.
In the conduction period of output switch 230, secondary side control module can monitor the cross-pressure of the electric capacity C1 of energy-storage units 220 by observation circuit 287.(do not illustrate when output voltage VO UTA reaches the first load, can be analogized it with reference to the related description of load 41 in figure 4) rated voltage level time, namely secondary side control module closes output switch 230, and notifies primary side control module (can analogize it with reference to the related description of primary side control module 273 in figure 4) to make output switch 283 conducting and allow the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 282 with its load) to next to carry out electric flux and supplement.Primary side control module can use primary side to adjust (PSR) technology to control output switch 283 to adjust the output voltage VO UTB of energy-storage units 282.
Discharge circuit 289 is for transistor Q5 in this embodiment, but is not restricted to this.And transistor Q5 first end and the second end are coupled to negative electrode and the energy-storage units 282 of diode D2 respectively.Transistor Q5 control end is then coupled to secondary side control module 260 (referring to Fig. 2).In this embodiment, output voltage VO UT is voltage maximum in output voltage VO UT, output voltage VO UTA and output voltage VO UTB.When needing the electric capacity C2 electric energy discharging energy-storage units 240, secondary side control module 260 controls transistor Q5 conducting, and electric flux can flow to the lower VOUTB of current potential via transistor Q5, to reach the object of fast quick-release energy.
In this embodiment, synchronous rectification unit 281 comprises synchronous rectification diode D1, resistance R6 and resistance R7.Synchronous rectification diode D1 negative electrode and positive electrode is coupled to the second end and the secondary side reference voltage (such as secondary side earthed voltage or other fixed voltage) of secondary side winding 212 respectively.When the cathode voltage of diode D1 is greater than anode voltage, diode D1 is cut-off state, and therefore synchronous rectification diode D1 also can be considered a kind of synchronous rectification switch.Resistance R6 first end is coupled to the negative electrode of synchronous rectification diode D1.Resistance R7 first end and the second end are coupled to second end of resistance R6 and the anode of synchronous rectification diode D1 respectively.Resistance R6 connects with resistance R7 and is used to dividing potential drop.Secondary side control module (can analogize it with reference to the related description of secondary side control module 260 in figure 4) can capture and be positioned at resistance R6 second end and resistance R7 first end and couple voltage signal on the monitoring point VSYNC at place.Secondary side control module 260 can judge according to the voltage level of observation station Sync described release energy during at the end of be stored in electric energy surplus in transformer T1, and carry out the ON time length of corresponding adjustment primary side control switch 272 according to electric energy surplus in transformer T1 at the end of during releasing energy, namely adjust the time span between charge period.
Fig. 8 is the 4th embodiment schematic diagram illustrating the AC/DC conversion equipment 20 of Fig. 2 according to the embodiment of the present invention.Embodiment illustrated in fig. 8ly can analogize it with reference to the related description of Fig. 4 to Fig. 7.4th embodiment is for being applied in the embodiment of display (monitor) system.4th embodiment includes energy-storage units 292, output switch 293, observation circuit 291, observation circuit 294, low dropout voltage regulator (Low-dropout regulator, LDO) 295 and low dropout voltage regulator 296 in addition.4th embodiment can be used to provide the power supply of the display driver plate (Scalar Board) of display system.In this embodiment, observation circuit 291 includes resistance R18 and R19.The first end of resistance R18 is coupled to second end of the first end of the electric capacity C3 of energy-storage units 282 and the transistor Q4 of output switch 283.Second end of resistance R18 is coupled to resistance R19 first end.Resistance R19 second end is coupled to secondary side reference voltage (such as secondary side earthed voltage or other fixed voltage).Observation circuit 291 is used for the voltage of the electric capacity C3 of energy-storage units 282 to carry out dividing potential drop, and branch pressure voltage is sent to secondary side control module 260 (as shown in Figure 2).The branch pressure voltage that secondary side control module 260 can produce according to resistance R18 and R19 and know the electrical property feature (such as voltage) of energy-storage units 282.
Energy-storage units 292 includes electric capacity C11.Output switch 293 includes transistor Q6.Observation circuit 294 includes resistance R20 and R21.The first end of resistance R20 is coupled to second end of the first end of the electric capacity C11 of energy-storage units 292 and the transistor Q6 of output switch 293.The first end of resistance R21 is coupled to second end of resistance R20.Second end of resistance R21 is coupled to secondary side reference voltage (such as secondary side earthed voltage).Energy-storage units 292, except output voltage can be provided to load 46, also can provide electric energy to low dropout voltage regulator 295,296.Low dropout voltage regulator 295,296 just can export different voltage respectively to load 44,45 after receiving electric energy.
The electrical power storage exported by rectification circuit 271 by conducting primary side control switch 272 between charge period is at transformer T1.After terminating between charge period, then enter during releasing energy.During releasing energy, the electric energy being stored in transformer T1 can distribute to energy-storage units 220,240,282 and 292.
When switch 230,283 and 293 is cut-off, the anode voltage of the diode D2 of output switch 250 can be drawn high by transformer T1, and the electric flux being therefore stored in transformer T1 can carry out electric flux to energy-storage units 240 and load 42 and supplement.During switch 230,283 and 293 is cut-off, the voltage of secondary side control module 260 (as shown in Figure 2) monitoring energy-storage units 240, and/or monitoring flow is through the electric current of load 42, to carry out optimization to the output electric energy of energy-storage units 240.Such as, the voltage of energy-storage units 240 can be maintained at the rated voltage level of load 42 by secondary side control module 260.Again such as, the electric current flowing through load 42 can be maintained at the nominal current level of load 42 by secondary side control module 260.Load 42 can be LED backlight (LED Backlight) module of display, and the voltage exporting load 42 to can be 30 ~ 60V, and maximum current can be 0.3 ~ 0.4A, but is not restricted to this.When the electric flux being dispensed to energy-storage units 240 arrives preset value, such as when the voltage of energy-storage units 240 reaches the rated voltage level of load 42, and/or when the electric current flowing through load 42 reaches the nominal current level of load 42, secondary side control module 260 i.e. conducting output switch 230, and allows the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 220 with load 41) to next to carry out electric flux and supplement.Due to output switch 230 conducting, the anode voltage of the diode D2 of output switch 250 is left behind.When the cathode voltage of diode D2 is greater than anode voltage, diode D2 is cut-off state, and therefore diode D2 can keep the voltage of electric capacity C2 in energy-storage units 240.
During output switch 230 conducting, the voltage of secondary side control module 260 (as shown in Figure 2) monitoring energy-storage units 220, to carry out optimization to the output electric energy of energy-storage units 220.Such as, the voltage of energy-storage units 220 can be maintained at the rated voltage level of load 41 by secondary side control module 260.Load 41 can be audio frequency (Audio) module of display.The voltage exporting load 41 to can be 5V, and maximum current can be 1.2A, but is not restricted to this.When the electric flux being dispensed to energy-storage units 220 arrives preset value, such as when the voltage of energy-storage units 220 reaches the rated voltage level of load 41, namely secondary side control module 260 closes output switch 230, and makes output switch 283 conducting and allow the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 282 with load 43) to next to carry out electric flux and supplement.
During output switch 283 conducting, the voltage of secondary side control module 260 (as shown in Figure 2) monitoring energy-storage units 282, to carry out optimization to the output electric energy of energy-storage units 282.Such as, the voltage of energy-storage units 282 can be maintained at the rated voltage level of load 43 by secondary side control module 260.Load 43 can be Video Graphics Array (Video Graphics Array, the VGA) circuit in the display driver plate (Scalar Board) of display.The voltage exporting load 43 to can be 5V, and maximum current can be 1.5A, but is not restricted to this.When the electric flux being dispensed to energy-storage units 282 arrives preset value, such as when the voltage of energy-storage units 282 reaches the rated voltage level of load 43, namely secondary side control module 260 closes output switch 283, and makes output switch 293 conducting and allow the electric flux being stored in transformer T1 can organize power supply circuits (energy-storage units 292, load 46, low dropout voltage regulator 295 and low dropout voltage regulator 296) to next to carry out electric flux and supplement.
During output switch 293 conducting, the voltage of secondary side control module 260 (as shown in Figure 2) monitoring energy-storage units 292, to carry out optimization to the output electric energy of energy-storage units 292.Such as, the voltage of energy-storage units 292 can be maintained at the rated voltage level of load 46 by secondary side control module 260.Load 46 can be I/O (Input/Output, the I/O) circuit in the display driver plate of display.The voltage exporting load 46 to can be 3.3V, and maximum current can be 0.8A, but is not restricted to this.When the electric flux being dispensed to energy-storage units 292 arrives preset value, such as, when the voltage of energy-storage units 292 reaches the rated voltage level of load 46, namely secondary side control module 260 closes output switch 293.
Low dropout voltage regulator 295 includes amplifier OP2, transistor Q7 and resistance R22, R23.The non-inverting input of amplifier OP2 receives reference voltage Vref 1.The output of amplifier OP2 is coupled to the control end of transistor Q7.The first end (being the electrical energy inputs of low dropout voltage regulator 295) of transistor Q7 is coupled to electric capacity C11 and transistor Q6.Second end of transistor Q7 is coupled to the first end of resistance R22.Second end of resistance R22 is coupled to the reverse input end of amplifier OP2 and the first end of resistance R23.Second end of resistance R23 is coupled to secondary side reference voltage.Second end of transistor Q7 is that the output of low dropout voltage regulator 295 is to power to load 44.Therefore, low dropout voltage regulator 295 can according to reference voltage Vref 1, and is the rated voltage of load 44 by the voltage transitions of energy-storage units 292.Load 44 can be the dynamic random access memory (Dynamic Random Access Memory, DRAM) in the display driver plate of display.The voltage exporting load 44 to can be 2.5V, but is not restricted to this.
Low dropout voltage regulator 296 includes amplifier OP3, transistor Q8 and resistance R24, R25.The non-inverting input of amplifier OP3 receives reference voltage Vref 2.The output of amplifier OP3 is coupled to the control end of transistor Q8.The first end (being the electrical energy inputs of low dropout voltage regulator 296) of transistor Q8 is coupled to electric capacity C11 and transistor Q6.Second end of transistor Q8 is coupled to the first end of resistance R24.Second end of resistance R24 is coupled to the reverse input end of amplifier OP3 and the first end of resistance R25.Second end of resistance R25 is coupled to secondary side reference voltage.Second end of transistor Q8 is that the output of low dropout voltage regulator 296 is to power to load 45.Therefore, low dropout voltage regulator 296 can according to reference voltage Vref 2, and is the rated voltage of load 45 by the voltage transitions of energy-storage units 292.Load 45 can be core (Core) module in the display driver plate of display.The voltage exporting load 45 to can be 1.2V, but is not restricted to this.In addition in the present embodiment, the voltage of energy-storage units 292 can be each energy-storage units 240,220,282,292 voltage among minimum, make the voltage of energy-storage units 292 can closer to the output voltage of low dropout voltage regulator 295 with low dropout voltage regulator 296.Because the pressure difference between the input voltage of low dropout voltage regulator and output voltage can reduce further, therefore can the conversion efficiency of booster tension.
In sum, all embodiments of the present invention provide a kind of AC/DC conversion equipment 20 and method of operation thereof.This AC/DC conversion equipment 20 uses secondary side control module 260 to monitor energy-storage units 220 and energy-storage units 240, and determines according to monitoring result or control the ON time length of output switch 230 and output switch 250.Therefore the same secondary side winding 212 of transformer T1 only need be used can to produce the output voltage that many groups can be made optimization and accurate adjustment, and do not need to configure extra electric pressure converter.And section Example of the present invention can use optical coupler feedback technology or primary side adjustment feedback technique to feed back voltage, can promote the conversion efficiency of AC/DC conversion equipment 20 and method of operation thereof further.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; have in any art and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the appended right person of defining.

Claims (24)

1. an AC/DC conversion equipment, comprising:
Transformer, comprises at least one first side winding and at least one secondary side winding;
First energy-storage units;
First output switch, the first end of described first output switch and the second end are coupled to the first end of described first energy-storage units and described secondary side winding respectively;
Second energy-storage units;
Second output switch, the first end of described second output switch and the second end are coupled to the described first end of described second energy-storage units and described secondary side winding respectively; And
Secondary side control module, be coupled to described first energy-storage units to monitor the first electrical property feature of described first energy-storage units, and be coupled to described second energy-storage units to monitor the second electrical property feature of described second energy-storage units, wherein said secondary side control module is the corresponding time span determining the conduction period of described first output switch according to the monitoring result to described first electrical property feature, and correspondence determines the time span of the conduction period of described second output switch according to the monitoring result to described second electrical property feature.
2. AC/DC conversion equipment according to claim 1, the conduction period of wherein said first output switch and the conduction period part of described second output switch overlap or do not overlap mutually.
3. AC/DC conversion equipment according to claim 1, also comprises:
Synchronous rectification unit, its first end and the second end are coupled to the second end and the reference voltage of described secondary side winding respectively.
4. AC/DC conversion equipment according to claim 3, described synchronous rectification unit comprises:
Synchronous rectification switch, its first end and the second end are coupled to described second end of described secondary side winding and described reference voltage respectively, and the control end of described synchronous rectification switch is coupled to described secondary side control module.
5. AC/DC conversion equipment according to claim 3, described synchronous rectification unit comprises:
Synchronous rectification diode, its negative electrode and positive electrode is coupled to described second end of described secondary side winding and described reference voltage respectively.
6. AC/DC conversion equipment according to claim 5, described synchronous rectification unit also comprises:
First resistance, its first end is coupled to the negative electrode of described synchronous rectification diode: and
Second resistance, its first end and the second end are coupled to the second end of described first resistance and the anode of described synchronous rectification diode respectively.
7. AC/DC conversion equipment according to claim 1, wherein said second energy-storage units is powered to the current path of load, and described AC/DC conversion equipment also comprises:
Current detector, is configured to detect the electric current of described load in described current path, and output electric current measure result is to described secondary side control module;
Wherein said secondary side control module receives the monitoring result of described current detecting result as described second electrical property feature.
8. AC/DC conversion equipment according to claim 1, also comprises:
3rd energy-storage units; And
Diode, the anode of described diode and negative electrode are coupled to the first end of described secondary side winding and described 3rd energy-storage units respectively.
9. AC/DC conversion equipment according to claim 1, at least one first side winding wherein said comprises the first first side winding, and described AC/DC conversion equipment also comprises:
Rectification circuit, its first DC terminal and the second DC terminal are coupled to first end and the primary side reference voltage of described first first side winding respectively;
Primary side control switch, the first end of described primary side control switch and the second end are coupled to the second end of described first first side winding and described primary side reference voltage respectively;
Primary side control module, the control end of itself and described primary side control switch couples;
Wherein said primary side control module decides by the time span of conduction period controlling described primary side control switch the electric flux being stored in described transformer, and described secondary side control module decides the electric flux that discharges from described transformer by the time span of the conduction period of described first output switch of control and described second output switch.
10. AC/DC conversion equipment according to claim 9, wherein said primary side control switch comprises:
Transistor, its first end is coupled to the second end of described first first side winding, and the control end of described transistor is coupled to described primary side control module;
First resistance, its first end and the second end are coupled to the second end of described transistor and described primary side reference voltage respectively; And
Second resistance, its first end and the second end are coupled to the described control end of described transistor and described primary side reference voltage respectively.
11. AC/DC conversion equipments according to claim 9, also comprise:
Bradyseism circuit, its first end and the second end couple with the first end of described first first side winding and the second end respectively.
12. AC/DC conversion equipments according to claim 11, wherein said bradyseism circuit comprises:
Resistance, its first end is coupled to the described first end of described first first side winding;
Electric capacity, its first end and the second end are coupled to the described first end of described first first side winding and the second end of described resistance respectively; And
Diode, its negative electrode and positive electrode is coupled to the second end of described resistance and the second end of described first first side winding respectively.
13. AC/DC conversion equipments according to claim 9, wherein said AC/DC conversion equipment also comprises:
Chip enable circuit, its two ends are coupled to described first DC terminal of described rectification circuit and described primary side control module respectively.
14. AC/DC conversion equipments according to claim 13, at least one first side winding wherein said also comprises the second first side winding, and described chip enable circuit comprises:
Resistance, its first end is coupled to described first DC terminal of described rectification circuit and the described first end of described first first side winding, and its second end is coupled to described primary side control module;
Diode, its negative electrode and positive electrode is coupled to the second end of described resistance and the first end of described second first side winding respectively; And
Electric capacity, its first end and the second end are coupled to the second end of described resistance and described primary side reference voltage respectively;
Second end of wherein said second first side winding is coupled to described primary side reference voltage.
15. AC/DC conversion equipments according to claim 9, also comprise:
Feedback module, its sense terminals is coupled to described second energy-storage units to monitor the 3rd electrical property feature of described second energy-storage units, the output of described feedback module is coupled to described primary side control module to provide the corresponding informance of described 3rd electrical property feature, and wherein said primary side control module is the corresponding ON time length determining described primary side control switch according to described corresponding informance.
16. AC/DC conversion equipments according to claim 15, wherein said feedback module comprises:
First resistance, its first end is coupled to described second energy-storage units;
Second resistance, its first end and the second end are coupled to the second end and the secondary side reference voltage of described first resistance respectively;
3rd resistance, its first end is coupled to described second energy-storage units;
First electric capacity, its first end is coupled to the second end of described first resistance;
Zener diode, its negative electrode and positive electrode is coupled to the second end of described first electric capacity and described secondary side reference voltage respectively;
Optical coupler, the first end of its illuminating part and the second end are coupled to the second end of described 3rd resistance and the second end of described first electric capacity respectively, and the first end of the photographic department of described optical coupler and the second end are coupled to described primary side control module respectively to provide described corresponding informance and described primary side reference voltage; And
Second electric capacity, its first end and the second end are coupled to first end and second end of the described photographic department of described optical coupler respectively.
17. AC/DC conversion equipments according to claim 9, wherein said primary side control module and described secondary side control module are all configured in same integrated circuit.
18. AC/DC conversion equipments according to claim 1, wherein said secondary side control module is coupled to the second end of described secondary side winding with monitoring voltage feature, and wherein said secondary side control module is the corresponding conducting sequential controlling described first output switch according to the monitoring result to described voltage characteristic.
19. AC/DC conversion equipments according to claim 1, also comprise low dropout voltage regulator, and its electrical energy inputs is coupled to described second energy-storage units.
20. AC/DC conversion equipments according to claim 19, the voltage of wherein said second energy-storage units is the minimum voltage among the voltage of multiple energy-storage units of described AC/DC conversion equipment.
The method of operation of 21. 1 kinds of AC/DC conversion equipments, comprising:
Configuration transformer is in described AC/DC conversion equipment, and wherein said transformer comprises at least one first side winding and at least one secondary side winding;
Configure the first energy-storage units and the first output switch in described AC/DC conversion equipment, the first end of wherein said first output switch and the second end are coupled to the first end of described secondary side winding and described first energy-storage units respectively;
Configure the second energy-storage units and the second output switch in described AC/DC conversion equipment, the first end of wherein said second output switch and the second end are coupled to the described first end of described second energy-storage units and described secondary side winding respectively;
In conduction period of described first output switch by delivery of electrical energy stored by described transformer to described first energy-storage units, and monitor the first electrical property feature of described first energy-storage units, and correspondence determines the time span of the conduction period of described first output switch according to the monitoring result to described first electrical property feature; And
In conduction period of described second output switch by delivery of electrical energy stored by described transformer to described second energy-storage units, and monitor the second electrical property feature of described second energy-storage units, and correspondence determines the time span of the conduction period of described second output switch according to the monitoring result to described second electrical property feature.
The method of operation of 22. AC/DC conversion equipments according to claim 21, also comprises:
Configuration rectification circuit is in described AC/DC conversion equipment, and the first DC terminal of wherein said rectification circuit and the second DC terminal are coupled to first end and the primary side reference voltage of described first side winding respectively;
Configuration primary side control switch is in described AC/DC conversion equipment, and the first end of wherein said primary side control switch and the second end are coupled to the second end of described first side winding and described primary side reference voltage respectively; And
The electrical power storage exported by described rectification circuit by primary side control switch described in conducting between charge period is at described transformer.
The method of operation of 23. AC/DC conversion equipments according to claim 22, between wherein said charge period, the conduction period of described first output switch and the conduction period of described second output switch do not overlap mutually.
The method of operation of 24. AC/DC conversion equipments according to claim 21, also comprises:
Detect the voltage of the second end of described secondary side winding, wherein when the second end of described secondary side winding is negative voltage level, the first output switch described in turn in order and described second output switch.
CN201310554566.4A 2013-11-07 2013-11-07 AC/DC converting device and operation method thereof Pending CN104638950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310554566.4A CN104638950A (en) 2013-11-07 2013-11-07 AC/DC converting device and operation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310554566.4A CN104638950A (en) 2013-11-07 2013-11-07 AC/DC converting device and operation method thereof

Publications (1)

Publication Number Publication Date
CN104638950A true CN104638950A (en) 2015-05-20

Family

ID=53217362

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310554566.4A Pending CN104638950A (en) 2013-11-07 2013-11-07 AC/DC converting device and operation method thereof

Country Status (1)

Country Link
CN (1) CN104638950A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030086279A1 (en) * 2001-11-05 2003-05-08 Laurence Bourdillon System and method for regulating multiple outputs in a dc-dc converter
CN1910808A (en) * 2004-01-05 2007-02-07 崇贸科技股份有限公司 Power-mode controlled power converter
WO2009146064A2 (en) * 2008-04-01 2009-12-03 William Baker Multiple bay battery chargers and circuitry
CN101682264A (en) * 2007-05-30 2010-03-24 宝威意大利股份公司 multi-output synchronous flyback converter
CN103312152A (en) * 2012-03-09 2013-09-18 联咏科技股份有限公司 Changing-over converter and related control method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030086279A1 (en) * 2001-11-05 2003-05-08 Laurence Bourdillon System and method for regulating multiple outputs in a dc-dc converter
CN1910808A (en) * 2004-01-05 2007-02-07 崇贸科技股份有限公司 Power-mode controlled power converter
CN101682264A (en) * 2007-05-30 2010-03-24 宝威意大利股份公司 multi-output synchronous flyback converter
WO2009146064A2 (en) * 2008-04-01 2009-12-03 William Baker Multiple bay battery chargers and circuitry
CN103312152A (en) * 2012-03-09 2013-09-18 联咏科技股份有限公司 Changing-over converter and related control method

Similar Documents

Publication Publication Date Title
TWI514745B (en) Ac-dc converting apparatus and operating method thereof
CN105515418B (en) PFC halt circuit for gently loading
CN101989810B (en) Method and apparatus for implementing a power converter input terminal voltage discharge circuit
CN104578826B (en) Switching Power Supply and the method that constant pressure and current constant control are provided in Switching Power Supply
CN104980053B (en) Flyback-based power conversion device
CN101997435B (en) There is master controller on the secondary side and the isolated AC-DC converter from controller on the primary side as well and method of operation thereof
CN101317323B (en) Switching power supply device and method for starting same
CN110071638A (en) Switching power unit and continuous-current plant
US8502420B1 (en) Power supply architecture for controlling and monitoring isolated output modules
CN102377169A (en) Thermal shutdown unit, switch controller including the same, and control method of thermal shutdown protection operation
CN105006966B (en) A kind of Switching Power Supply control chip and inverse-excitation type AC DC converters
CN105684281B (en) Power converter with dynamic preload
CN109742956A (en) Flyback switching power supply with power limiting power supply protection function
CN205249038U (en) Drive and control circuit and switching power supply
CN103178717A (en) DC/DC converter and driver controller
CN101789682A (en) Multiple output power supply time sequence control device and method
CN102195487A (en) Power supply device and image forming apparatus
CN105307305A (en) LED power supply control device and TV set
CN105449995B (en) Drive control circuit and drive control method and Switching Power Supply
CN102916578A (en) Switch type power supply and control method for providing output voltage
CN109412436A (en) A kind of synchronous rectification control chip and circuit
US10205336B2 (en) Switched-mode power supply having at least one power circuit and at least one auxiliary power supply unit
CN104638950A (en) AC/DC converting device and operation method thereof
CN102148578B (en) Power device
CN211670787U (en) Flyback converter

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20150520

WD01 Invention patent application deemed withdrawn after publication