CN104135156A - Circuit and method for controlling programmable power converter - Google Patents
Circuit and method for controlling programmable power converter Download PDFInfo
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- CN104135156A CN104135156A CN201410009178.2A CN201410009178A CN104135156A CN 104135156 A CN104135156 A CN 104135156A CN 201410009178 A CN201410009178 A CN 201410009178A CN 104135156 A CN104135156 A CN 104135156A
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- transformer
- programmable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a circuit and a method for controlling programmable power converter. The circuit comprises a control circuit, a feedback circuit, a synchronous rectifier and an optical coupler, wherein the control circuit is used for generating a programmable voltage reference signal, the feedback circuit is used for checking an output voltage of the power converter so as to generate a feedback signal according to the programmable voltage reference signal and the output voltage, a switching controller is used for checking a switching current of a transformer so as to generate a switching signal according to the feedback signal and the switching current of the transformer, the switching signal is used for switching the transformer so as to generate the output voltage and the output current of the power converter, and the synchronous rectifier is coupled to the transformer so as to generate the output voltage of the power converter.
Description
Technical field
The present invention relates to a kind of technology of the output voltage for regulating power transducer, and relate in particular a kind of for controlling circuit and the method thereof of programmable power transducer.
Background technology
Programmable power transducer provides output voltage and the output current of broad range, for example, pacifies to 5 peaces for 5 volts to 20 volts and 0.5.In general, there is cost benefit, efficient solution and realize protection completely to power converter (for example, overvoltage etc.) and be difficult to exploitation.The target that is used for the technology of power ratio control transducer is for head it off, and exploitation has the programmable power transducer of low cost, high efficiency and premium properties.
Summary of the invention
The invention provides a kind of for controlling the circuit of programmable power transducer.Described circuit comprises control circuit, feedback circuit, switch controller, synchronous rectifier and optical coupler.Described control circuit produces the programmable voltage reference signal for described power converter.Described feedback circuit is configured to detect output voltage for producing feedback signal according to described programmable voltage reference signal and described output voltage.The switch current that described switch controller is configured to detect transformer produces switching signal for the described switch current according to described feedback signal and described transformer, and described switching signal is configured to switch described transformer for producing described output voltage and output current.Described synchronous rectifier is couple to described transformer for producing the described output of described power converter.Described optical coupler is configured to described feedback signal to be sent to described switch controller from described control circuit.Described control circuit is arranged in the primary side of described transformer.Described switch controller is arranged in the primary side of described transformer.Described control circuit produces the driving signal that is configured to control described synchronous rectifier.
On the other hand, the invention provides a kind of for controlling the method for programmable power transducer.The method comprises the following steps.Produce the programmable voltage reference signal for described power converter; Detect the output voltage of described power converter for producing feedback signal according to described programmable voltage reference signal and described output voltage; The switch current that detects transformer produces switching signal for the described switch current according to described feedback signal and described transformer, and described switching signal is configured to switch described transformer for producing described output voltage and the output current of described power converter; And, the described output that produces described power converter by the synchronous rectifier of described power converter.Wherein, produce and drive signal for controlling described synchronous rectifier.
Brief description of the drawings
Comprise accompanying drawing so that a further understanding of the present invention to be provided, and accompanying drawing is incorporated in this specification and forms the part of this specification.Described brief description of the drawings example embodiment of the present invention, and together with the description in order to explain principle of the present invention.
Fig. 1 is the block diagram of the programmable power transducer of one embodiment of the present of invention;
Fig. 2 is the block diagram of the control circuit of one embodiment of the present of invention;
Fig. 3 is the block diagram of the circuit of synchronous rectification of one embodiment of the present of invention;
Fig. 4 is the block diagram of the feedback circuit of one embodiment of the present of invention;
Fig. 5 is the circuit diagram of the protective circuit of one embodiment of the present of invention;
Fig. 6 is the reference circuit figure of the timer of one embodiment of the present of invention;
Fig. 7 is the block diagram of the switch controller of one embodiment of the present of invention;
Fig. 8 is the schematic circuit of pulse width modulation (PWM) circuit of one embodiment of the present of invention;
Fig. 9 is the block diagram of the programmable circuit of one embodiment of the present of invention;
Figure 10 is the block diagram of the pulse position modulation circuit in Fig. 9 of one embodiment of the present of invention;
Figure 11 is control signal SX, slope signal SLP, synchronizing signal SYNC, data-signal SD and the waveform schematic diagram through rectification signal SM of one embodiment of the present of invention;
Figure 12 is control signal SX, the reset signal PSET of one embodiment of the present of invention and the waveform schematic diagram of guard signal PRT.
Description of reference numerals:
10: transformer;
15: resistor;
16: resistor;
25: resistor;
30: synchronous rectifier;
40: output capacitor;
50: optical coupler;
51: resistor;
60: optical coupler;
61: resistor;
70: capacitor;
80: embedded microcontroller;
81: register;
82: register;
83: register;
85: memory;
86: resistor;
87: resistor;
92: D/A converter;
93: D/A converter;
95: A/D converter;
96: multiplexer;
100: control circuit;
110: circuit of synchronous rectification;
111: resistor;
112: resistor;
115: sampling and holding circuit;
121: comparator;
123: inverter;
125; Comparator
126: comparator;
135: converter;
136: converter;
145: switch;
146: switch;
150: capacitor;
159: capacitor;
161: switch;
169: switch;
175: with door;
176: with door;
200: feedback circuit;
240: error amplifier;
245: buffer;
250: protective circuit;
251: inverter;
252: with door;
253: trigger;
256: resistor;
257: resistor;
260: multiplexer;
265: comparator;
271: transistor;
272: transistor;
280: timer;
281: inverter;
282: transistor;
283: constant current source;
285: capacitor;
290: comparator;
300: switch controller;
310: voltage detecting circuit;
315: comparator;
320: current detection circuit;
325: amplifier;
326: capacitor;
331: or door;
335: resistor;
336: transistor;
337: resistor;
338: resistor;
350: pulse width modulation (PWM) circuit;
351: inverter;
360: oscillator;
365: comparator;
367: comparator;
370: with door;
375: trigger;
400: programmable circuit;
410: current source;
415: comparator;
420: timer;
421: inverter;
425: timer;
426: with door;
427: inverter;
450: digital decoder;
460: register;
465: register;
470：DAC；
475：DAC；
480: adder circuit;
485: adder circuit;
500: pulse position modulation circuit;
510: transistor;
511: resistor;
512: current source;
520: capacitor;
530: comparator;
570: trigger;
580: pulse-generating circuit;
CS: current signal;
CLR: input signal;
CNT: control signal;
COMM: communication interface;
COMV: voltage feedback signal;
FB: feedback signal;
IC: charging current;
ID: discharging current;
IEA: current circuit signal;
IFB: current feedback signal;
IJ: electric current is adjusted signal;
IO: output current;
IRF: reference signal;
NB: control bus signal;
NDA: digital code;
NM: numerical data;
OFF: shutoff signal;
OV: overvoltage signal
PLS: clock signal;
PRT: guard signal;
PSET: reset signal;
PWRST: electric power is connected reset signal;
REF_I: reference signal;
REF_V: reference signal;
RMP: ramp signal;
RST: electric power is connected reset signal;
S1: signal;
S2: signal;
SCNT: pulse signal;
SD: data-signal;
SG: synchronous rectification drives signal;
SM: through rectification signal;
SW: switching signal;
SX: control signal;
SY: control signal;
SYNC: synchronizing signal;
SLP: slope signal;
TA: cycle;
TB: cycle;
TC: cycle;
TDS: discharge time signal;
TOT: cycle;
TOUT: signal expires;
TOV: cycle;
VA: secondary feedback signal;
VB: feedback signal;
VDD: supply voltage;
VDET: transformer signal;
VEA: voltage circuit signal;
VFB: feedback signal;
VI: input voltage signal;
VIN: input voltage;
VJ: voltage adjustment signal;
VO: output voltage;
VOV: overvoltage threshold value;
VRF: reference signal;
VRV: reference signal;
VS: through reflected signal/through reflected voltage;
VT: threshold value;
VT1: threshold value;
VT2: threshold value;
VTH1: threshold value;
VTS: threshold value;
VTS1: threshold value;
VTS2: threshold value;
VAR: voltage.
Embodiment
Fig. 1 is the block diagram of the programmable power transducer of one embodiment of the present of invention.Programmable power transducer comprises transformer 10, control circuit 100, switch controller 300, synchronous rectifier (synchronous rectifier is called for short SR) 30 and optical coupler (opto-coupler) 50.Programmable power transducer also comprises capacitor 70, optical coupler 60, resistor 51, resistor 61, resistor 16 and resistor 25, and output capacitor 40.Control circuit 100 comprises feedback (feedback) circuit.Input voltage VIN is couple to transformer 10.Control circuit 100 is configured to detect output voltage VO for forming feedback loop.Control circuit 100 produces the feedback signal FB that is couple to switch controller 300 via optical coupler 50 for regulation output voltage VO.In other words, optical coupler 50 is sent to switch controller 300 by feedback signal FB from control circuit 100.Capacitor 70 for bucking voltage feedback loop for regulation output voltage VO.Control circuit 100 also produces the control signal SX that is configured to control via optical coupler 60 switch controller 300.Control signal SX is for programming and the overvoltage protection (over-voltage protection) of switch controller 300.Resistor 51 increases bias voltage for the operating current to optical coupler 50.Resistor 61 is for limiting the electric current of optical coupler 60.Control circuit 100 also comprise for for example mobile phone, tablet PC (personal computer, be called for short PC), the communication interface COMM(of the communication with external apparatus such as notebook computer for example, USB-PD, IEEE UPAMD1823, single line communication etc.).
Optical coupler 50 produces feedback signal VB according to feedback signal FB.Optical coupler 60 produces control signal SY according to control signal SX.Switch controller 300 produce switching signal SW for the armature winding (primary winding) of switching transformer 10 to produce output voltage VO and output current IO via synchronous rectifier 30 and output capacitor 40 at the secondary winding place of transformer 10.Synchronous rectifier 30 drives signal SG to control by synchronous rectification, and synchronous rectification drives signal SG to be produced by control circuit 100.Synchronous rectifier 30 produces the output voltage VO of power converter.Transformer signal VDET produces in the secondary winding (secondary winding) of transformer 10 in response to the connection of switching signal SW.Transformer signal VDET is couple to control circuit 100 and drives signal SG for producing synchronous rectification.
Transformer 10 also produces through reflected signal VS in response to the cut-out of switching signal SW.Through reflected signal VS via resistor 15 and resistor 16 and be couple to switch controller 300.Resistor 25 is configured to the switch current of sensing transformer 10 for producing the current signal CS that is couple to switch controller 300.Switch controller 300 is according to feedback signal VB, control signal SY, produce switching signal SW through reflected signal VS and current signal CS.In other words, switch controller 300 detects the switch current of transformer 10 for producing switching signal SW according to the switch current of feedback signal FB and transformer 10, and switching signal SW is configured to switching transformer 10 for producing output voltage VO and the output current IO of power converter.Control circuit 100 is couple to the primary side of transformer 10.Switch controller 300 is couple to the primary side of transformer 10.
Fig. 2 is the block diagram of the control circuit 100 of one embodiment of the present of invention.Control circuit 100 comprises embedded microcontroller (MCU) 80, circuit of synchronous rectification 110, register (register, REG) 81 to 83, D/A converter (digital-to-analog converter, be called for short DAC) 92 to D/A converter 93, A/D converter (analog-to-digital converter is called for short ADC) 95, multiplexer (MUX) 96 and feedback circuit 200.Embedded microcontroller 80 comprises memory 85.Programmable voltage reference signal (, control signal CNT) and control bus signal NB that microcontroller 80 produces for power converter.Control bus signal NB is two-way (I/O) transmission.Microcontroller 80 comprise for the communication interface COMM of external device (ED) (for example, main frame and/or I/O device) communication.Control bus signal NB is used for controlling A/D converter (ADC) 95, multiplexer (MUX) 96, register (register) 81, register 82 and register 83 and D/A converter (DAC) 92 and D/A converter 93.D/A converter 92 and D/A converter 93 by embedded microcontroller 80 via control bus signal NB and register 82 and register 83 and control.Register 81 produces digital code NDA, and described digital code NDA is configured to control circuit of synchronous rectification 110.Circuit of synchronous rectification 110 produces SR and drives signal SG and input voltage signal VI in response to transformer signal VDET, output voltage VO and digital code NDA.The level of input voltage signal VI is relevant to the level of the input voltage VIN of the power converter in Fig. 1.
Voltage divider is formed by resistor 86 and resistor 87, for produce feedback signal VFB according to output voltage VO.Feedback signal VFB is couple to A/D converter 95 via multiplexer (multiplexer) 96.Input voltage signal VI is also couple to A/D converter 95 via multiplexer 96.Therefore,, via control bus signal NB, microcontroller 80 can read the output voltage VO of power converter and the information of input voltage VIN.Microcontroller 80 is controlled the output of D/A converter 92, D/A converter 93 by register 82, register 83 and control bus signal NB.D/A converter 92 produces reference signal VRV for controlling output voltage VO.D/A converter 93 produces overvoltage threshold value (threshold) VOV for overvoltage protection.Microcontroller 80 is controlled overvoltage threshold value VOV according to the level of output voltage VO.The electric power connection in response to control circuit 100 is reset to initial value by register 81, register 82 and register 83.For instance, the initial value of register 82 will produce the minimum value of reference signal VRV, and it produces the output voltage VO of 5 volts.
The output voltage VO of feedback circuit 200 detection power transducers is to produce voltage feedback signal COMV, feedback signal FB and control signal SX according to reference signal VRV, overvoltage threshold value VOV, output voltage VO, feedback signal VFB and control signal CNT.
Fig. 3 is the block diagram of the circuit of synchronous rectification 110 of one embodiment of the present of invention.Circuit of synchronous rectification 110 comprises resistor 111, resistor 112, sampling and holding circuit (sample-and-hold circuit, be called for short S/H) 115, comparator 121, comparator 125 and comparator 126, converter (voltage-to-current converter is called for short V/I) 135 and converter 136, inverter 123, capacitor 150 to 159 and switch 145 be to switch 146 and switch 161 to switch 169.Transformer signal VDET is couple to sampling and holding circuit (S/H) 115 via resistor 111 and resistor 112.Sampling and holding circuit 115 produce input voltage signal VI in response to the sample of transformer signal VDET.Converter 135 produces charging current IC according to input voltage signal VI.Converter 136 also produces discharging current ID according to output voltage VO.Charging current IC is configured to by switch 145, array of capacitors be charged.Discharging current ID is configured to by switch 146, array of capacitors be discharged.Array of capacitors is formed to switch 169 to capacitor 159 and switch 161 by capacitor 150.Switch 161 is controlled by digital code NDA to switch 169.Comparator 121 makes the signal S1 can be at the voltage division signal of transformer signal VDET turn on-switch 145 during higher than threshold value VTS.In the time that signal S1 stops using, if the voltage VAR on array of capacitors higher than threshold value VTS2, comparator 126 will make the signal S2 can be by with door 176 and inverter 123 and turn on-switch 146.In addition, in the time that signal S1 stops using, if the voltage VAR on array of capacitors higher than threshold value VTS1, comparator 125 will be by producing SR driving signal SG with door 175 and inverter 123.In response to the programming (program) of output voltage VO, the electric capacity of array of capacitors will be programmed by microcontroller 80.
Fig. 4 is the block diagram of the feedback circuit of one embodiment of the present of invention.As shown in Figure 4, feedback circuit 200 comprises error amplifier (error amplifier) 240, buffer (BUF) 245 and protective circuit 250.Error amplifier 240 produces voltage feedback signal COMV according to feedback signal VFB and reference signal VRV.Voltage feedback signal COMV is connected to capacitor 70 in Fig. 1 for loop compensation (loop-compensation).Voltage feedback signal COMV is also connected to buffer 245 for producing feedback signal FB.In other words, buffer 245 produces feedback signal FB according to voltage feedback signal COMV.Buffer 245 is output as out leakage (open-drain) structure.Protective circuit 250 receives control bus signal NB and produces control signal SX according to overvoltage threshold value VOV, output voltage VO and control signal CNT.
Fig. 5 is the circuit diagram of the protective circuit of one embodiment of the present of invention.As shown in Figure 5, protective circuit 250 comprise timer 280, inverter 251, with door 252, trigger (flip-flop) 253, multiplexer 260, comparator 265, transistor 271 and transistor 272 and resistor 256 and resistor 257.Inverter 251 reception control signal CNT are to produce input signal CLR, and timer 251(is for example, Watch Dog Timer) remove by receiving input signal CLR.If periodically do not produce control signal CNT, timer 280 produces the signal TOUT that expires so.Expire signal TOUT and electric power is connected the reset signal PWRST trigger 253 that is configured to reset.Trigger 253 is set by control bus signal NB by microcontroller 80.Overvoltage threshold value VOV and threshold value VT are couple to comparator 265 by multiplexer 260.Multiplexer 260 is controlled by trigger 253.In the time that trigger 253 is set, overvoltage threshold value VOV will be connected to comparator 265.If trigger 253 is reset, threshold value VT will be connected to comparator 265 for overvoltage protection so.Output voltage VO is couple to comparator 265 by resistor 256 and resistor 257.The overvoltage protection of this embodiment can be by microcontroller 80 by the level of overvoltage threshold value VOV is programmed, and if control signal CNT periodically do not produce in time, overvoltage threshold value will reset to minimum value so.For instance, the output voltage VO for 12 volts is programmed into 14 volts by overvoltage threshold value VOV, and the output voltage VO for 5 volts is programmed into 6 volts by threshold value VT.If control signal CNT is not produced in time by microcontroller 80, even so in the time that output voltage VO is set as 12 volts, overvoltage threshold value VOV will be reset to 6 volts.Said circumstances will be protected power converter in case abnormal operation in the time that microcontroller 80 operates improperly.The output driving transistors 271 of comparator 265 is for producing control signal SX.Control signal CNT also driving transistors 272 produces control signal SX.Transistor 271 and 272 is output as and is connected in parallel.Therefore, control signal SX is for the protection of power converter and control microcontroller 80.
Fig. 6 is the reference circuit figure of the timer of one embodiment of the present of invention.As shown in Figure 6, timer 280 comprises inverter 281, transistor 282, constant current source 283, capacitor 285 and comparator 290.Constant current source 283 is for charging to capacitor 285.The input signal CLR of timer 280 is configured to by inverter 281 and transistor 282 and capacitor 285 is discharged.If capacitor 285 does not discharge in time by signal CLR, so in the time that the voltage of capacitor 285 is charged higher than threshold value VTH1, comparator 290 is by generation signal (expiration signal) TOUT that expires.
Fig. 7 is the block diagram of the switch controller of one embodiment of the present of invention.As shown in Figure 7, switch controller 300 comprises voltage detecting circuit (voltage detection circuit, V-DET) 310, current detection circuit (current detection circuit, I-DET) 320, comparator (comparator) 315, amplifier 325 or door 331, capacitor 326, resistor 335, resistor 337 and resistor 338, transistor 336, programmable circuit 400 and pwm circuit 350.Current detection circuit 320 is according to produce voltage circuit signal VEA and discharge time signal TDS through reflected signal VS.Voltage circuit signal VEA is relevant to output voltage VO.Discharge time signal TDS is relevant to the degaussing time (demagnetizing time) of transformer 10.Current detection circuit 320 is according to current signal CS and discharge time signal TDS and generation current loop signal IEA.Voltage detecting circuit 310 is relevant with the technology that the primary side of power converter regulates with current detection circuit 320.
Voltage circuit signal VEA is couple to comparator 315, and for when voltage circuit signal VEA is during higher than reference signal REF_V, comparator 315 produces overvoltage signal OV.Current circuit signal IEA is couple to amplifier 325.Current circuit signal IEA is connected to amplifier 325 and compares with generation current feedback signal IFB with the reference signal REF_I being produced by programmable circuit 400.Capacitor 326 is couple to current feedback signal IFB for loop compensation.Programmable circuit 400 is configured to connect reset signal RST and produce reference signal REF_V, REF_I and guard signal PRT in response to control signal SY and electric power.Reference signal REF_V operates for overvoltage protection as overvoltage threshold value.This overvoltage protection is by detecting and form through reflected signal VS.Reference signal REF_I operates the output current IO for regulating power transducer as current reference signal.
Or door 331 receives guard signal PRT and overvoltage signal OV to produce shutoff signal OFF.Resistor 335 draws feedback signal VB on by being connected to supply voltage VDD.Transistor 336 receiving feedback signals VB and supply voltage VDD are to produce secondary feedback signal VA by resistor 337 and 338.Pwm circuit 350 is connected reset signal RST according to secondary feedback signal VA, current feedback signal IFB, shutoff signal OFF and electric power and is produced switching signal SW.
Fig. 8 is the schematic circuit of pulse width modulation (PWM) circuit of one embodiment of the present of invention.Pwm circuit 350 comprise oscillator (oscillator, OSC) 360, inverter 351, comparator 365,367, with door 370 and trigger 375.Oscillator 360 clocking PLS and ramp signal RMP.Trigger 375 receive clock signal PLS are periodically to connect switching signal SW.When ramp signal RMP is in comparator 365,367 during higher than current feedback signal IFB or secondary feedback signal VA, switching signal SW will cut off.Also receive shutoff signal OFF to cut off switching signal SW by inverter 351 with door 370.
Fig. 9 is the block diagram of the programmable circuit of one embodiment of the present of invention.As shown in Figure 9, programmable circuit 400 comprise current source 410, comparator 415, pulse position modulation (PPM) circuit 500, timer 420 and 425, digital decoder 450, inverter 421,427, with door 426, register 460 and 465, DAC470,475 and adder circuit 480 and 485.Current source 410 is through connecting the above control signal SY that draws.Comparator 415 produces pulse signal SCNT during lower than threshold value VT1 at control signal SY.PPM circuit 500 produces through rectification signal SM and synchronizing signal SYNC in response to pulse signal SCNT.Be couple to digital decoder 450 to produce numerical data NM through rectification signal SM and synchronizing signal SYNC.Numerical data NM stores in register 460 and register 465.Register 460 is couple to D/A converter (DAC) 470 for producing voltage adjustment signal VJ.Adder circuit 480 is by producing reference signal REF_V with reference to signal VRF and voltage adjustment signal VJ addition.
Register 465 is couple to D/A converter 475 and adjusts signal IJ for generation current.Add circuit 485 is by producing reference signal REF_I with reference to signal IRF and electric current adjustment signal IJ addition.Therefore, reference signal REF_V and reference signal REF_I can be programmed by microcontroller 80.The overvoltage protection for switch controller 300 through reflected voltage VS of transformer 10.The threshold value that is used for the overvoltage protection of output voltage VO can be programmed by the control circuit of the primary side of transformer 10 100.In addition, the value of output current IO can be programmed by the control circuit 100 in the primary side of transformer 10.
Pulse signal SCNT is also couple to timer 420 for detecting the pulse duration of pulse signal SCNT.If the pulse duration of pulse signal SCNT exceedes cycle T OV, guard signal PRT will be produced by inverter 421 by timer 420 so.Guard signal PRT is configured to cut off switching signal SW.Because in the time that the overvoltage of output voltage VO is detected by the control circuit 200 in the primary side of transformer 10, control signal SX(and pulse signal SCNT) will be produced as and be greater than cycle T OV, so switching signal SW will cut off in the time that the overvoltage of output voltage VO is detected.
Another timer 425 is configured to the return pulse signal SCNT by inverter 427.In the time that pulse signal SCNT does not produce in specific period TOT, timer 425 will be by producing reset signal PSET with door 426.Receive output that electric power connects reset signal RST and timer 425 to produce reset signal PSET with door 426.Reset signal PSET is configured to remove register 460,465, for the value of voltage adjustment signal VJ and electric current adjustment signal IJ is reset to zero.Therefore,, in the time that control signal SX is not produced by control circuit 100, reference signal REF_V will be set as minimum value (VRF) for overvoltage protection.In addition,, in the time that control signal SX is not periodically produced in time by control circuit 100, reference signal REF_I will be set as minimum value (IRF) for regulation output electric current I O.Therefore,, if not operation rightly of microcontroller 80, the reference signal regulating for the threshold value of overvoltage protection with for output current so will reset to minimum value.Therefore the control signal SX, being produced by control circuit 100 is for following situation.
(1), when overvoltage detected in control circuit 100 time, control signal SX is for overvoltage protection.
(2) control signal SX is for communicating by letter for setting overvoltage threshold value (REF_V) and the current limit threshold (REF_I) of switch controller 300.
(3) control signal SX operates to guarantee control circuit 100 rightly for the timer 420 of the switch controller 300 of resetting; otherwise overvoltage threshold value (REF_V) and the current reference signal (REF_I) of switch controller 300 will reset to minimum value, for protection and regulating power transducer.
Figure 10 is the block diagram of the pulse position modulation circuit in Fig. 9 of one embodiment of the present of invention.As shown in figure 10, pulse modulation (pulse-position modulation is called for short PPM) circuit 500 operates as being used for the demodulator of the input signal with pulse position modulation.PPM circuit 500 comprises current source 512, transistor 510, resistor 511, capacitor 520, comparator 530, trigger 570 and pulse-generating circuit 580.Current source 512 charges to capacitor 520.Pulse signal SCNT is configured to by transistor 510 and resistor 511 and capacitor 520 is discharged.Slope signal SLP is produced by capacitor 520.It is high that comparator 530 is produced as logic by data-signal SD at slope signal SLP during higher than threshold value VT2.Data-signal SD will be latched in response to pulse signal SCNT in trigger 570 for producing through rectification signal SM.Pulse signal SCNT is also configured to produce synchronizing signal SYNC by pulse-generating circuit 580.
Figure 11 is control signal SX, slope signal SLP, synchronizing signal SYNC, data-signal SD and the waveform schematic diagram through rectification signal SM of one embodiment of the present of invention.As shown in figure 11, waveform shown produce according to the pulse position of control signal SX through rectification signal SM.In Figure 11, cycle T A is called the inactive cycle of control signal SX.Cycle T B and TC are called cycle when control signal SX enables and tiltedly signal SLP is not higher than threshold value VT2.
Figure 12 is control signal SX, the reset signal PSET of one embodiment of the present of invention and the waveform schematic diagram of guard signal PRT.If control signal SX does not produce in specific period TOT, will produce so reset signal PSET.If the pulse duration of control signal SX is greater than cycle T OV, will produce so guard signal PRT.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, in the time carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, disk or CDs.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (16)
1. for controlling a circuit for programmable power transducer, it is characterized in that, comprising:
Control circuit, for generation of the programmable voltage reference signal for power converter;
Feedback circuit, the output voltage that is configured to detect described power converter is for producing feedback signal according to described programmable voltage reference signal and described output voltage;
Switch controller, switch current for detection of transformer produces switching signal for the described switch current according to described feedback signal and described transformer, and described switching signal is configured to switch described transformer for producing described output voltage and the output current of described power converter;
Synchronous rectifier, is couple to described transformer for producing the described output voltage of described power converter; And
Optical coupler, for being sent to described switch controller by described feedback signal from described control circuit;
Wherein, described control circuit is couple to the primary side of described transformer; Described switch controller is couple to the primary side of described transformer; Described control circuit produces the driving signal that is configured to control described synchronous rectifier.
2. circuit according to claim 1, is characterized in that, described control circuit comprises:
Communication interface, for at least one communication with external apparatus.
3. circuit according to claim 1, is characterized in that, described control circuit also produces the programmable digital code that is configured to produce described driving signal.
4. circuit according to claim 1, is characterized in that, described switch controller be configured to detect described transformer through reflected signal for regulate the described output current of described power converter according to the degaussing time of described transformer.
5. circuit according to claim 1, is characterized in that, described switch controller is configured to detect through reflected signal for carrying out the overvoltage protection in described switch controller.
6. circuit according to claim 1, is characterized in that, also comprises:
The second optical coupler, for being sent to described switch controller by the control signal of described control circuit.
7. circuit according to claim 1, is characterized in that, described control circuit comprises:
Digital/analog circuitry, produces the overvoltage threshold value for the overvoltage protection of described control circuit;
Excess voltage protection, for producing overvoltage signal by more described output voltage and described overvoltage threshold value;
Wherein, described overvoltage signal is sent to described switch controller by described the second optical coupler; Described overvoltage threshold response is connected and is reset to the minimum value of described overvoltage threshold value in the electric power of described power converter; Described overvoltage signal is configured to the described switching signal of stopping using.
8. circuit according to claim 1, is characterized in that, described programmable voltage reference signal response is connected and is reset to initial value in the described electric power of described power converter.
9. circuit according to claim 1, is characterized in that, also comprises:
Microcontroller, for generation of described programmable voltage reference signal and described control signal;
Wherein, described control signal is configured to control described switch controller by described the second optical coupler.
10. circuit according to claim 9, is characterized in that, described control circuit also comprises:
Timer, for receiving described control signal from described microcontroller;
Wherein, if described control signal does not periodically produce in time, described timer produces timeout signal; Described programmable voltage reference signal and described overvoltage threshold response able to programme are reset to respectively initial value in described timeout signal.
11. circuit according to claim 1, is characterized in that, described control circuit also comprises:
A/D converter, for detection of the described output voltage of described power converter, wherein, the output of described A/D converter is couple to microcontroller.
12. circuit according to claim 11, is characterized in that, described control circuit detects the input voltage of described power converter by circuit of synchronous rectification and described A/D converter.
13. circuit according to claim 1, is characterized in that, described control circuit produces and is configured to the described control signal for the overvoltage protection of described output voltage to the overvoltage threshold signal programming in described switch controller.
14. circuit according to claim 1, is characterized in that, described control circuit produces the programmable current reference signal that is configured to control in described switch controller for regulating the control signal of described output current.
15. circuit according to claim 14, is characterized in that, the electric power connection in response to described switch controller is reset to respectively initial value by described programmable current reference signal and described overvoltage threshold signal; And if the not generation in time of described control signal, so described programmable current reference signal and described overvoltage threshold signal are reset to respectively described initial value.
16. 1 kinds for controlling the method for programmable power transducer, it is characterized in that, comprising:
Produce the programmable voltage reference signal for described power converter;
Detect the output voltage of described power converter for producing feedback signal according to described programmable voltage reference signal and described output voltage;
The switch current that detects transformer produces switching signal for the described switch current according to described feedback signal and described transformer, and described switching signal is configured to switch described transformer for producing described output voltage and the output current of described power converter; And
Produce the described output of described power converter by the synchronous rectifier of described power converter, wherein produce and drive signal for controlling described synchronous rectifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009178.2A CN104135156A (en) | 2014-01-08 | 2014-01-08 | Circuit and method for controlling programmable power converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410009178.2A CN104135156A (en) | 2014-01-08 | 2014-01-08 | Circuit and method for controlling programmable power converter |
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| CN104135156A true CN104135156A (en) | 2014-11-05 |
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| CN201410009178.2A Pending CN104135156A (en) | 2014-01-08 | 2014-01-08 | Circuit and method for controlling programmable power converter |
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| US10157702B2 (en) | 2014-12-07 | 2018-12-18 | Alpha And Omega Semiconductor (Cayman) Ltd. | Pulse transformer |
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