CN103856058A - Voltage conversion circuit and voltage conversion controller - Google Patents
Voltage conversion circuit and voltage conversion controller Download PDFInfo
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Abstract
The invention relates to a voltage conversion circuit, which comprises an application circuit and a voltage conversion controller. The application circuit comprises an output end, a feedback end and a feedback capacitor coupled to the feedback end. The output terminal has an output voltage and is coupled to a current load. The voltage conversion controller has a feedback terminal pin coupled to the feedback terminal. The voltage conversion controller has a first mode and a second mode. In the first mode, the output terminal provides a regulated output voltage and supplies current to the current load, and the feedback pin receives a feedback signal. In the second mode, the output voltage is not regulated, the feedback pin provides a constant periodic counting frequency signal, and the period of the counting frequency signal is determined by the capacitance of the feedback capacitor.
Description
[technical field]
The present invention is about a kind of voltage conversion circuit, particularly a kind of voltage conversion circuit of the voltage conversion controller that comprises multi-functional single stitch.
[background technology]
Please refer to U.S. Patent number US7,848,124.Voltage conversion controller is to be applied among a flyback Switching Power Supply change-over circuit (fly-back switching power converter).Flyback switch power converter is the one of voltage conversion circuit configuration, and its object is providing a stable output voltage.When described flyback Switching Power Supply change-over circuit is during in steady state operation, described voltage conversion controller is by negative feedback control, regulate (regulation) for its output voltage, to provide stable and specified output voltage values and an output current to give a current loading.Now on the back coupling point IN3 on its negative feedback control path, there is a signal, be for one with the signal of its output current size linear correlation, described voltage conversion controller carries out negative feedback control according to the signal of feedbacking on some IN3.And when described flyback Switching Power Supply change-over circuit is in the time that unstable state operates; for example carry out the excessive protection operation of load current when load current is excessive; or when the soft start operation of circuit initial start; now specified output voltage values is not set up; and because the signal on described back coupling point IN3 is relevant to the signal of output; the signal of now feedbacking on some IN3 is after experiencing of short duration transient response; be finally a continuous direct voltage signal, and the function with real benefit is not provided for circuit operation.
In current mainstream applications, voltage conversion controller is realized with integrated circuit conventionally, and coordinates outside application circuit composition voltage conversion circuit, to reach cost, circuit volume and to use the optimization in elasticity.Described integrated circuit comprises the stitch (pins) being electrical connected with external electronic components, and is hope for success this and the optimization of volume, use under flexible prerequisite not affecting, the stitch number of integrated circuit can be fewer better.Therefore in design, if can allow stitch under all circuit use states, providing the function of real benefit, is the optimization utilization to stitch.With above-mentioned prior art of giving an example, its representative feedback point stitch at voltage conversion controller in the time that unstable state operates, do not provide for the function on circuit operation with real benefit, this is the universal phenomenon of at present general voltage conversion controller integrated circuit.
[summary of the invention]
In view of this, the invention provides a kind of voltage conversion circuit, comprise a voltage conversion controller, is an integrated circuit, and described voltage conversion controller can provide and have multi-functional single stitch, optimizes according to this utilization to stitch.
The disclosed voltage conversion circuit of the present invention, comprises an application circuit and a voltage conversion controller.Application circuit comprises an output, a back coupling end and is coupled to a back coupling electric capacity of back coupling end.Output has an output voltage, and couples a current loading.Voltage conversion controller has a back coupling end stitch, is coupled to described back coupling end.Voltage conversion controller has a first mode and one second pattern.In the time of described first mode, described output provides modulated output voltage also to give current loading for induced current, and feedbacks the reception of end stitch one back coupling signal.In the time of described the second pattern, described output voltage is not modulated, and described back coupling end stitch provides a count frequency signal of fixed cycle property, and the cycle size of count frequency signal is determined by feedbacking the capacitance of electric capacity.
Effect of the present invention is, the use amount that the disclosed technical characterictic of the present invention can be saved integrated circuit stitch, thereby can further save cost; And the voltage conversion controller of same design can be used in various application, also thereby reduce integrated circuit package in response to the derivative version quantity of various different application, and simplify the problem of manufacturer production, stock, management.
About feature of the present invention, implementation and effect, hereby coordinate to be graphicly described in detail as follows as most preferred embodiment.
[accompanying drawing explanation]
Fig. 1 is the circuit diagram of electric pressure converter of the present invention.
Fig. 2 is the composition function block schematic diagram of voltage conversion controller of the present invention.
Fig. 3 is voltage conversion controller of the present invention while carrying out soft start operation, the voltage waveform view of each main end points.
Fig. 4 is the voltage waveform view of Tu3Zhong local magnification region.
Fig. 5 is that voltage conversion controller of the present invention is exported overcurrent protection when operation, the voltage waveform view of each main end points.
Fig. 6 is among voltage conversion controller of the present invention, the circuit diagram of oscillating controller.
Primary clustering symbol description:
100 electric pressure converter 151 optical sensing subassemblies
110 power-supply unit 243 second current switches
111 bridge full wave rectifier 244 second electric current assemblies
112 input electric capacity of voltage regulation 245 internal source voltages
113 first siding ring 251 counters
130 output unit 252 SS (soft start) control circuit
131 second siding ring 253 overload protection control circuits
132 output diodes 254 are closed logical circuit
133 output electric capacity of voltage regulation 255 oscillating controllers
134 first feedback resistance 280 charge-discharge circuits
135 second feedback resistance 310 output voltage waveforms
The output waveform of 136 current-limiting resistance 320 oscillating controllers
The voltage waveform of 137 light-emitting diodes 330 back coupling end stitch
The first comparing voltage value of 138 three-terminal shunt regulator 331 oscillating controllers
The second comparing voltage value of 150 feedback circuit unit 332 oscillating controllers
341 threshold currents controlled stages are in the magnitude of voltage of steady state operation equivalence threshold currents
Under the voltage waveform of 350 induced current voltage pin
The region of 152 back coupling electric capacity 360 340 and 350 local waveform amplification
The output waveform of 170 power switch unit 510 overload protection control circuits
171 power switch 520 oscillating controller output waveforms
The voltage waveform of 172 induced current resistance 530 back coupling end stitch
The first comparing voltage value of 200 voltage conversion controller 531 oscillating controllers
The second comparing voltage value of 210 power switch control pin 532 oscillating controllers
The output waveform of 211 power switch driving stage 540 threshold currents controlled stages
The voltage waveform of 212 pulse-width modulation latch unit 550 induced current voltage pin
213 internal oscillator 610 controller inputs
214 pulse-width modulation comparator 620 controller output ends
215 threshold currents controlled stage 630 first comparators
220 induced current voltage pin 640 second comparators
221 gain stage 650 first comparative voltages
230 grounding leg 660 second comparative voltages
240 back coupling end stitch 670 are set replacement latch unit
241 first electric current assemblies
[embodiment]
In the middle of specification and follow-up claim, " coupling " word is comprise directly any and be indirectly electrically connected means at this.Therefore, be coupled to one second device if describe a first device in literary composition, represent that described first device can directly be electrically connected in described the second device, or be indirectly electrically connected to described the second device by other device or connection means.
Fig. 1 is the circuit diagram of a voltage conversion circuit 100.Voltage conversion circuit 100 is the configurations for a flyback Switching Power Supply change-over circuit.Voltage conversion circuit 100 comprises voltage conversion controller 200 of the present invention and an application circuit.Application circuit comprises an output and a back coupling end COMP.Output has an output voltage, and couples a current loading.Voltage conversion controller 200 more comprises a power-supply unit 110, an output unit 130, a feedback circuit unit 150 and a power switch unit 170.
As shown in Figure 1, power-supply unit 110 comprises a bridge full wave rectifier 111, input electric capacity of voltage regulation 112 and a first siding ring 113.
Bridge full wave rectifier 111 is the AC power VAC of an input to be carried out to full-wave rectification and provide a full-wave rectification result to export in it.
Input electric capacity of voltage regulation 112 is coupled to the output of bridge full wave rectifier 111, and full-wave rectification result is carried out to voltage stabilizing, to produce an input voltage VIN on input electric capacity of voltage regulation 112.
First siding ring 113 has the first end points and the second end points, and the first end points is coupled to input electric capacity of voltage regulation 112.The main function of power-supply unit 110 is to provide input voltage VIN to give first siding ring 113.
As shown in Figure 1, output unit 130 comprises a second siding ring 131, an output diode 132, an output electric capacity of voltage regulation 133, one first feedback resistance 134, one second feedback resistance 135, a current-limiting resistance 136, a light-emitting diode 137 and a three-terminal shunt regulator 138.
Second siding ring 131 has the first end points and the second end points, and closes and be and form a transformer device with first siding ring 113 tool mutual inductances.
The positive terminal of output diode 132 is coupled to the first end points of second siding ring 131.The negative pole end of output diode 132 is coupled to one end of output electric capacity of voltage regulation 133, and forms the anode VOP of an output.
The other end of output electric capacity of voltage regulation 133 is coupled to the second end points of second siding ring 131, and forms the negative terminal VON of an output.Wherein between the anode VOP of output and the negative terminal VON of output, provide an output voltage.
The first feedback resistance 134 is coupled between the anode VOP of output and one end of the second feedback resistance 135.The other end of the second feedback resistance 135 is coupled to the negative terminal VON of output.The tie point of the first feedback resistance 134 and the second feedback resistance 135 provides an output voltage dividing potential drop VFB, and is coupled to the input of three-terminal shunt regulator 138.
One end of current-limiting resistance 136 is coupled to the anode VOP of output, and the other end is coupled to the anode of light-emitting diode 137.
The negative terminal of light-emitting diode 137 is coupled to the output plus terminal of three-terminal shunt regulator 138.The output negative terminal of three-terminal shunt regulator 138 is coupled to the negative terminal VON of output.
As shown in Figure 1, three-terminal shunt regulator 138 comprises a reference voltage level, when the voltage of input is greater than described reference voltage level, between the output plus terminal of three-terminal shunt regulator 138 and output negative terminal, is the state of a conducting.Anti-, when the voltage of its input is less than described reference voltage level, between the output plus terminal of three-terminal shunt regulator 138 and output negative terminal, be the state of a not conducting.Therefore, in the time that output voltage dividing potential drop VFB is greater than described reference voltage level, the output conducting of three-terminal shunt regulator 138, and form electric current on light-emitting diode 137, and size of current is subject to the restriction of current-limiting resistance 136, now light-emitting diode 137 forms a luminous light source; And in the time that output voltage dividing potential drop VFB is less than described reference voltage level, the not conducting of output of three-terminal shunt regulator 138, does not have an electric current on light-emitting diode 137, that is light-emitting diode 137 is not luminous.
As shown in Figure 1, power switch unit 170 comprises a power switch 171 and an induced current resistance 172.The output of power switch 171 and induced current resistance 172 are connected in series, and are coupled between second end points and earth terminal of first siding ring 113.In the time that power switch 171 is opened, input electric capacity of voltage regulation 112, first siding ring 113, power switch 171 and induced current resistance 172 form a current circuit.Because first siding ring 113 is inductive assemblies, therefore the formation of described current circuit by storage power on first siding ring 113.In addition, induced current resistance 172 transfers the current signal on described current circuit to a voltage signal VCS.In the time that power switch 171 is closed, storage power on first siding ring 113 is by the transformer device forming with second siding ring 131, be released into second siding ring 131 and form an electric current on it, and in voltage conversion circuit 100 during in steady state operation, between the anode of output and negative terminal, set up a specified output voltage VO UT, and provide electric current to give to be serially connected with the current loading (not shown) between anode and the negative terminal of output.
As shown in Figure 1, feedback circuit unit 150 comprises an optical sensing subassembly 151 and a back coupling electric capacity 152.Optical sensing subassembly 151 and light-emitting diode 137 form the configuration of an optical coupler, when light-emitting diode 137 forms a luminous light source, optical sensing subassembly 151 detects described light source and forms an electric current thereon, and described size of current be directly proportional to the intensity of described light source close be.Hence one can see that, utilizes described transformer and described optical coupler, the isolation on a side of a side of input ac power and output can being done completely electrically.
As shown in Figure 1, optical sensing subassembly 151 and back coupling electric capacity 152 are connected in parallel and are coupled between the back coupling end COMP and earth terminal of application circuit.Described voltage conversion controller 200 is integrated circuit units, and has multiple stitch.Stitch comprises power switch control pin 210, induced current voltage pin 220, grounding leg 230 and feedbacks end stitch 240.Power switch control pin 210 is coupled to the control end of power switch 171, uses the open and close of power ratio control switch 171.Induced current voltage pin 220 is to accept the voltage signal VCS that induced current resistance 172 produces.230 of grounding legs are coupled to earth terminal.Feedback and hold 240 of stitch to be coupled to back coupling end COMP.
Fig. 2 is the composition function block schematic diagram of voltage conversion controller 200.Voltage conversion controller 200 more comprises one first electric current assembly 241, one first current switch 242, one second current switch 243, one second electric current assembly 244, one internal source voltage 245, one counter 251, one SS (soft start) control circuit 252, one overload protection control circuit 253, one closes logical circuit 254, one oscillating controller 255, one power switch driving stage 211, one pulse-width modulation latch unit 212, one internal oscillator 213, one pulse-width modulation comparator 214, one threshold currents controlled stage 215, an and gain stage 221.
The first electric current assembly 241 is coupled to one end of internal source voltage 245 and the first current switch 242.
The other end of the first current switch 242 is coupled to feedback holds stitch 240.
The first electric current assembly 241 has formed a switching current assembly with being connected in series of the first current switch 242, and wherein the first electric current assembly 241 can be resistor assembly or is current source assembly.
The second electric current assembly 244 is coupled to one end of grounding leg 230 and the second current switch 243.The other end of the second current switch 243 is coupled to feedback holds stitch 240.
The second electric current assembly 244 has formed another switching current assembly with being connected in series of the second current switch 243, and wherein the second electric current assembly 244 can be resistor assembly or is current source assembly.
The input of oscillating controller 255 is coupled to feedback holds stitch 240, and in the time of the unstable state operation of voltage conversion circuit 100, produce a period frequency signal in its output, use and control the unlatching of the first current switch 242 and the second current switch 243 and close.
The output of oscillating controller 255 is also coupled to counter 251.Counter 251 is in the time of the unstable state operation of voltage conversion circuit 100, and output one result is given SS (soft start) control circuit 252 and exports another result and give overload protection control circuit 253.
253 of overload protection control circuits, according to setting, control and cut out logical circuit 254, whether to determine temporary close voltage conversion controller 200.
Pulse-width modulation comparator 214 has an anode input, one first negative terminal input, one second negative terminal input and an output.Its first negative terminal input is coupled to feedback holds stitch 240.Its output is coupled to counter 251.
The input of gain stage 221 is coupled to induced current voltage pin 220, and the output of gain stage 221 is coupled to the anode input of pulse-width modulation comparator 214.Gain stage 221 is that its input signal is exported after suitable linearity is amplified again.Threshold currents controlled stage 215 provides the magnitude of voltage of an equivalent threshold currents to export in it, and is coupled to the second negative terminal input of pulse-width modulation comparator 214.
Pulse-width modulation latch unit 212 has a set input, a replacement input and an output.Replacement input is coupled to the output of pulse-width modulation comparator 214.Internal oscillator 213 provides a pulse-width modulation frequency of operation, and is coupled to the set input of pulse-width modulation latch unit 212.
Power switch driving stage 211 has an input and an output, its input is coupled to the output of pulse-width modulation latch unit 212, the output of power switch driving stage 211 is coupled to power switch control pin 210, and carrys out the capacity load of driving power switch 171 control ends according to the input signal of its input.
In the time of the steady state operation of voltage conversion circuit 100, voltage conversion controller 200 is feedback the current loading between anode VOP and the negative terminal VON of regulating and controlling output, and provides a modulated rated output voltage VOUT in output voltage.So-called modulated person, refer in the time of the variation in specification limit of applications circuit and the each parameter generating of current loading, the negative feedback controlling mechanism that voltage conversion controller 200 all can coordinate applications circuit to be set up with it is reacted, so that output voltage remains on a specified VOUT.
At voltage conversion circuit 100 in the time that unstable state operates; voltage conversion controller 200 fit applications circuit; by carrying out necessary reaction with each assembly and current loading in protection voltage conversion controller 200, application circuit, application circuit is avoided and cause assembly damage or other misoperation because of the situation of overvoltage or overcurrent.Locking that the reaction of common unstable state operation comprises soft start, input voltage is not enough, the too high protection of output voltage, output overcurrent protection etc.Embodiments of the invention are the steady state operation with voltage conversion circuit 100, and the unstable state operation of soft start, output overcurrent protection carries out the explanation of technical characterictic, are hereby described as follows.
When voltage conversion circuit 100 is during in steady state operation, output voltage is a ripple wave shape, and the average voltage of described ripple wave shape is rated output voltage VOUT.The examination explanation cycle behavior of described ripple wave shape and the adjusting of voltage conversion controller 200 action are as follows.
Cycle at the beginning, the internal oscillator 213 of voltage conversion controller 200 is exported pulse wave, produce signal " 1 " to trigger the set input of pulse-width modulation latch unit 212 in the output that triggers pulse-width modulation latch unit 212, now the control end of 211 driving power switches 171 of power switch driving stage with open power switch 171, and form a current circuit and storage power on first siding ring 113.Now described transformer does not provide electric current in described output, therefore the required electric charge of current loading on output is to come from output electric capacity of voltage regulation 133, therefore described output voltage is linear declines.And due to the electric current on first siding ring 113, that is electric current on power switch 171 continues to rise, therefore the voltage signal VCS on induced current voltage pin 220 also continues to rise, until VCS is greater than the magnitude of voltage of feedbacking on end stitch 240, these frequency width modulation comparator 214 output signals " 1 " are to the replacement input of pulse-width modulation latch unit 212 and produce signal " 0 " in the output of pulse-width modulation latch unit 212, and therefore power switch driving stage 211 closes power switch 171.Storage power on first siding ring 113 is by the transformer device forming with second siding ring 131, is released into second siding ring 131 and forms an electric current on it, and use and provide electric current to give load current and output electric capacity of voltage regulation 133 is charged.Now described output voltage is linear rises, until internal oscillator 213 produces next pulse wave, and opens power switch 171.Therefore voltage conversion circuit 100 periodically operates.
And the current value of working as load current increases, because temporarily cannot providing enough electric currents, voltage conversion circuit 100 gives load current, thus provide required additional charge by output electric capacity of voltage regulation 133, thereby cause output voltage to decline.When now the dividing potential drop VFB of output voltage is less than the reference voltage of three-terminal shunt regulator 138, the output plus terminal of three ends Yin depressors 138 in parallel with export not conducting between negative terminal, that is an electric current and not luminous is not had in the output of light-emitting diode 137.151 of optical sensing subassemblies do not detect light source, thereby on it, also do not have an electric current.And in the time of steady state operation, the first current switch 242 switch conductions, the switch cut-off of the second current switch 243.In the time that optical sensing subassembly 151 is not had electric current, the first electric current assembly 241 provides an electric current to charge to back coupling electric capacity 152, the magnitude of voltage of feedbacking on end stitch 240 rises, and cause in the time that first siding ring 113 carries out storage power, the upper current limit of its operation improves, and also can store more energy, thereby in the time that second cycle is released into second siding ring 131, can provide a larger electric current to provide output unit 130 required, and output voltage is regulated, to reply its rated voltage VOUT.
Anti-, when the current value of load current reduces, because providing multiple current, voltage conversion circuit 100 gave output, and unnecessary electric current charges to output electric capacity of voltage regulation 133, and causes output voltage to rise.When now the dividing potential drop VFB of output voltage is greater than the reference voltage of three ends Yin depressors 138 in parallel, the output plus terminal of three ends Yin depressors 138 in parallel with export conducting between negative terminal, that is light-emitting diode 137 forms electric current and luminous.Optical sensing subassembly 151 detects light source, thereby forms electric current on it, and causes back coupling electric capacity 152 to discharge.The magnitude of voltage of feedbacking on end stitch 240 declines, that is in the time that first siding ring 113 carries out storage power, the upper current limit of its operation declines, that is store less energy, thereby in the time that being released into second siding ring 131, provide a less electric current to give output unit 130 in second cycle, by this output voltage is regulated, to reply its rated voltage VOUT.Change caused transient behavior by above load current, can be observed the negative feedback controlling mechanism that voltage conversion controller 200 utilizes itself and application circuit to set up, can make corresponding operation, and output voltage is regulated, so that output voltage remains on a specified voltage VOUT.Or the now state in a steady state operation of title voltage conversion circuit 100.In addition, from aforesaid operations, the magnitude of voltage of feedbacking on end stitch 240 is linear relevant to the size of current of described load current, this characteristic that electric pressure converter of a Controlled in Current Mode and Based (current-mode control) has.But in other electric pressure converter configuration, for example, in the electric pressure converter of a voltage mode control (voltage-mode control), the magnitude of voltage of feedbacking on end stitch 240 is linear relevant to output voltage size, the technical characterictic that this has disclosed for prior art, does not separately repeat at this.
And in the time that described voltage conversion controller 200 has just started to start, the steady state operation of output voltage is not yet set up, that is the state of voltage conversion circuit 100 in a unstable state operation.Now described voltage conversion controller 200 carries out soft start operation, and sets up the steady state operation of output voltage, so that voltage conversion circuit 100 reaches the state of steady state operation.When soft start operation can avoid circuit just to start to start effectively, in circuit, each assembly operation reduces its useful life in limit situation, and the surging producing in power-supply unit 110 can reduce circuit start time.The time that soft start operation allows is longer, its protection effect that can reach better, but the circuit start time must consider the system specification in application and conventionally have a maximum restriction, thereby form the choice on designing.The soft start operation of voltage conversion controller 200 illustrates the oscillogram that coordinates Fig. 3.
Fig. 3 is voltage conversion controller 200 while carrying out soft start operation, the voltage waveform view of each main end points.Wherein 310 is output voltage waveforms, 320 is the output waveform of oscillating controller 255, 330 hold the voltage waveform on stitch 240 for feedbacking, 331 is one first comparing voltage value of oscillating controller 255, 332 is one second comparing voltage value of oscillating controller 255, 340 output waveforms that are limited Current Control level 215, 341 magnitudes of voltage that are limited Current Control level 215 equivalent threshold currents under steady state operation at voltage conversion circuit 100, 350 is the voltage waveform on induced current voltage pin 220, it is the voltage waveform of VCS, 360 is the region of 340 and 350 local waveform amplification shown in Fig. 4.
As shown in Figure 3, due to the output of oscillating controller 255 be control open the first current switch 242 and the second current switch 243 both one, and in the time that voltage conversion controller 200 starts at the beginning, the voltage of feedbacking on end stitch 240 is less than the first comparing voltage value 331, therefore the first current switch 242 is unlocked, the first electric current assembly 241 provides an electric current to flow into the end points of back coupling end stitch 240, again because output voltage is not set up, reacting to optical sensing subassembly 151 is that it does not have an electric current, therefore the electric current that the first electric current assembly 241 provides charges to back coupling electric capacity 152, the voltage of therefore feedbacking on end stitch 240 continues to rise, until be greater than the first comparing voltage value 331, the now output of oscillating controller 255 changes, the first current switch 242 switch cut-offs, and the second current switch 243 switch conductions.Now the second electric current assembly 244 provides the end points that an outflow of bus current is feedback end stitch 240, cause back coupling electric capacity 152 to discharge, the voltage of therefore feedbacking on end stitch 240 starts continuous decrease, until be less than the second comparing voltage value 332, the now output of oscillating controller 255 changes, the first current switch 242 switch conductions, and the second current switch 243 switch cut-offs, and the voltage of feedbacking on end stitch 240 starts to continue to rise, finally form the periodic waveform part as shown in 330.And the output of oscillating controller 255 also forms the periodic waveform part as shown in 320.In addition, the large I in described cycle is directly decided by the capacitance of back coupling electric capacity 152.
Further illustrate, oscillating controller 255, the first electric current assembly 241, the first current switch 242, the second current switch 243 and the second electric current assembly 244 be combined to form a charge-discharge circuit 280, as shown in Figure 2.Described charge-discharge circuit 280 is in the time of the second pattern, described back coupling electric capacity 152 is is periodically discharged and recharged, to form aforesaid periodic waveform.When wherein oscillating controller 255 rises to the first comparing voltage value 331 and drops to the second comparing voltage value 332 respectively at the voltage of back coupling electric capacity 152, change the outputting level of oscillating controller 255.
As shown in Figure 3; under soft start operation, the output of threshold currents controlled stage 215 is not the magnitude of voltage as shown in 341 at the beginning, but in the mode of segment increasing; carry out the threshold currents size of setting power switch 171, to reach the protective circuit assembly of soft start and to reduce the object of circuit surging.Figure 4 shows that the region 360 of 340 and 350 local waveform amplification in Fig. 3.In the time that internal oscillator 213 sends pulse wave with unlatching power switch 171, the now voltage waveform 350 on induced current voltage pin 220, be VCS, it is the waveform that a straight line rises, until be greater than the value that threshold currents controlled stage 215 sets, that is 340 in figure, make pulse-width modulation comparator 214 export " 1 ", and close described power switch 171, until internal oscillator 213 sends pulse wave next time.Therefore formed the periodicity signal as the VCS in figure.
Go back to Fig. 3.As shown in Figure 3, the periodic waveform that counter 251 in voltage conversion controller 200 can utilize the output of aforementioned oscillating controller 255 to form, count and and export result to SS (soft start) control circuit 252, SS (soft start) control circuit 252 progressively increases the output of threshold currents controlled stage 215 according to the result of counting, to reach the operation of soft start.It should be noted that, the cycle of the output of oscillating controller 255, the time span of soft start operation will be determined, therefore in circuit application, user can be by directly changing the capacitance of the back coupling electric capacity 152 of voltage conversion controller 200 outsides, design the time of soft start operation, and the voltage conversion controller 200 that makes same design can be used in various application, thereby reduce integrated circuit package in response to the derivative version quantity of various different application, and simplify the problem of manufacturer's production, stock, management.
In addition, during in steady state operation, if load current increases, and be greater than 100 output currents that can supply of voltage conversion circuit at voltage conversion circuit 100, the unstable state of now can trigger voltage switching controller 200 exporting overcurrent protection operates.The object of output overcurrent protection, is to prevent that circuit unit is always under too high current practice situation and damage, and even causes burning and causes using the anxiety of fail safe.The output overcurrent protection operation of voltage conversion controller 200 illustrates the oscillogram that coordinates Fig. 5.
Fig. 5 is that voltage conversion controller 200 is exported overcurrent protection when operation, the voltage waveform view of each main end points.Wherein 510 is the output waveform of described overload protection control circuit 253; 520 is the output waveform of oscillating controller 255; 530 hold the voltage waveform on stitch 240 for feedbacking; 531 is one first comparing voltage value of oscillating controller 255; 532 is one second comparing voltage value of oscillating controller 255; 540 output waveforms that are limited Current Control level 215,550 is the voltage waveform on induced current voltage pin 220, the i.e. voltage waveform of VCS.
As shown in Figure 5, voltage conversion circuit 100 state in steady state operation at the beginning.In the time of a time point t1, the load current of its output increases, and is greater than 100 output currents that can supply of voltage conversion circuit, now due to the supply current capacity deficiency of voltage conversion circuit 100, causes output voltage to continue lower than rated output voltage VOUT.React to 151 of optical sensing subassemblies be not detect light source, thereby on it, do not have an electric current.The electric current of the first electric current assembly 241 is therefore to feedbacking electric capacity 152 lasting charging, the voltage of feedbacking on end stitch 240 continues to rise, until be greater than the first comparing voltage value 531, the now output of oscillating controller 255 changes, and close the first current switch 242, and open the second current switch 243.
Now the second electric current assembly 244 provides the end points that an outflow of bus current is feedback end stitch 240, cause back coupling electric capacity 152 to discharge, the voltage of therefore feedbacking on end stitch 240 starts continuous decrease, until be less than the second comparing voltage value 532, the now output of oscillating controller 255 changes, and opens the first current switch 242, and closes the second current switch 243, and the voltage of feedbacking on end stitch 240 starts to continue to rise, finally form the periodic waveform part as shown in 530.And the output of oscillating controller 255 also forms the periodic waveform part as shown in 520.In addition, the large I in described cycle is directly decided by the capacitance of back coupling electric capacity 152.
As shown in Figure 5; the periodic waveform that counter 251 in voltage conversion controller 200 can utilize the output of aforementioned oscillating controller 255 to form is counted; and in the time reaching a pre-set count values, send signal and give overload protection control circuit 253; export the action of overcurrent protection; for example notice is closed logical circuit 254, the output current no longer to continue to close power switch 171.As shown in during as t2 in Fig. 5, now the output waveform 510 of overload protection control circuit 253 is sent pulse wave, and power switch 171 ends, the voltage waveform 550 on induced current voltage pin 220, i.e. and the voltage of VCS, is continuously 0.
From the operation of the present embodiment, when state at voltage conversion circuit 100 in steady state operation, described back coupling signal, that is the voltage signal of feedbacking on end stitch 240, be linearly related to output current size, with the required signal of negative feedback control that provides voltage conversion controller 200 to carry out regulation output voltage, or the voltage signal also may be interpreted as on back coupling end stitch 240 is produced by loop and the associated component thereof of described negative feedback control.And pulse-width modulation comparator 214 is to receive the voltage signal of feedbacking on end stitch 240, to carry out dynamic operation.And at voltage conversion circuit 100 when the state in unstable state operation, described count frequency signal, that is the voltage signal of feedbacking on end stitch 240, it is a periodic signal, and cycle size is determined by the capacitance of outside back coupling electric capacity 152, thereby provide a frequency size relatively accurately can supply the frenquency signal of counting, what operate for unstable state is required, or the voltage signal also may be interpreted as on back coupling end stitch 240 is by the first electric current assembly 241, the first current switch 242, the second current switch 243, the second electric current assembly 244, internal source voltage 245, oscillating controller 255 and back coupling electric capacity 152 produce.And oscillating controller 255 is to receive the voltage of feedbacking on end stitch 240, and carry out dynamic operation.Voltage signal on known back coupling end stitch 240 is under two kinds of modes of operation of voltage conversion circuit 100, produced from the different circuit compositions of described application circuit by described voltage conversion controller, and difference in functionality is provided respectively but gives two electronic circuits in voltage conversion controller 200 for the necessary signal of circuit operation, i.e. pulse-width modulation comparator 214 and oscillating controller 255.The voltage of reviewing on the back coupling end stitch of voltage conversion controller in prior art is all produced by same circuits composition under any state, and only can provide significant signal for utilization during at steady state operation in electric pressure converter.Therefore the use amount that the disclosed technical characterictic of the present invention can be saved integrated circuit stitch, thereby can further save cost; And the voltage conversion controller of same design can be used in various application, also thereby reduce integrated circuit package in response to the derivative version quantity of various different application, and simplify the problem of manufacturer production, stock, management.
Figure 6 shows that among voltage conversion controller 200, described in swing controller 255 a circuit embodiments.Oscillating controller 255 comprises a controller input 610, a controller output end 620, one first comparator 630, one second comparator 640, one first comparative voltage 650, one second comparative voltage 660 and a setting replacement latch unit 670.Controller input 610 is coupled to feedback holds stitch 240, and the signal of controller output end 620 is in order to control conducting or the cut-off of the first current switch 242 and the second current switch 243.The first comparator 630 has a positive input terminal, a negative input end and an output, and wherein said positive input terminal is coupled to controller input 610, and described negative input end is coupled to the first comparative voltage 650.The second comparator 640 has a positive input terminal, a negative input end and an output, and wherein said negative input end is coupled to controller input 610, and described positive input terminal is coupled to the second comparative voltage 660.Set replacement latch unit 670 and there is a set input, a replacement input and an output, wherein said set input is coupled to the output of the first comparator 630, described replacement input is coupled to the output of the second comparator 640, and the output of setting replacement latch unit 670 is coupled to controller output end 620.
As shown in Figure 6, upper the first comparative voltage 650 of design is greater than the second comparative voltage 660 conventionally.In the time that the voltage of controller input 610 is less than the second comparative voltage 660, the second comparator 640 is exported " 1 " and is given the replacement input of setting replacement latch unit 670, thereby controller output end 620 is output as " 0 ".In the time that the voltage of controller input 610 is greater than the first comparative voltage 650, the first comparator 630 is exported " 1 " and is given the set input of setting replacement latch unit 670, thereby controller output end 620 is output as " 1 ".In the time that voltage circle of controller input 610 is between the first comparative voltage 650 and the second comparative voltage 660, the first comparator 630 and the second comparator 640 are all exported " 0 ", set the output of replacement latch unit 670, that is the output of controller output end 620 remains unchanged.
Although embodiments of the invention disclose as mentioned above; so not in order to limit the present invention; anyly have the knack of related art techniques person; without departing from the spirit and scope of the present invention; such as work as and can do a little change according to shape, structure, feature and quantity described in the present patent application scope, therefore scope of patent protection of the present invention must be as the criterion depending on the appended claim person of defining of this specification.
Claims (12)
1. a voltage conversion controller, be applied to a voltage conversion circuit, described voltage conversion circuit operates a power switch wherein, so that an input voltage is converted to an output voltage in an output, and produce a back coupling signal, described back coupling signal is coupled to a back coupling electric capacity, it is characterized in that, described voltage conversion controller comprises:
One back coupling end stitch, is coupled to described back coupling electric capacity, and for receiving described back coupling signal or a count frequency signal being provided; And
One power switch control pin, in order to control the operation of power switch described in described voltage conversion circuit;
Wherein said voltage conversion controller has a first mode and one second pattern; When wherein said first mode, described output provides modulated described output voltage and gives a current loading for induced current, and described back coupling end stitch receives described back coupling signal, and described back coupling signal is relevant to the size of current of described output voltage or described current loading; When described the second pattern, described output voltage is not modulated, and described back coupling end stitch provides the described count frequency signal of fixed cycle property, and the cycle size of described count frequency signal is determined by the capacitance of described back coupling electric capacity.
2. voltage conversion controller according to claim 1, is characterized in that, wherein said the second pattern is for a soft start operation or is the excessive protection operation of a load current.
3. voltage conversion controller according to claim 1; it is characterized in that; wherein said count frequency signal is among a soft start operation or the excessive protection of load current operation; as the frequency of length computing time, to determine the time span of the excessive protection operation of described soft start operation or described load current.
4. voltage conversion controller according to claim 1, is characterized in that, wherein said voltage conversion circuit is to be a flyback switch power converter.
5. voltage conversion controller according to claim 1, is characterized in that, described voltage conversion controller more comprises a charge-discharge circuit, in the time of described the second pattern, described back coupling electric capacity is is periodically discharged and recharged.
6. voltage conversion controller according to claim 5, is characterized in that, wherein said charge-discharge circuit more comprises:
One first switching current, is coupled to described back coupling end stitch, and the sense of current is for flowing into described back coupling end stitch; And
One second switch electric current, is coupled to described back coupling end stitch, and the sense of current is for flowing out described back coupling end stitch.
7. voltage conversion controller according to claim 6, it is characterized in that, wherein said the first switching current comprises a switch module, and a current source assembly or a resistor assembly, or described second switch electric current comprises a switch module, and a current source assembly or a resistor assembly.
8. voltage conversion controller according to claim 6, is characterized in that, wherein more comprises an oscillating controller and a counter; In the time that electric pressure converter works in described the second pattern, conducting or the cut-off of described the first switching current and described second switch electric current controlled in described oscillating controller utilization, described back coupling electric capacity is is periodically discharged and recharged, and the described count frequency signal of formation fixed cycle property, in order to the frequency source as described counter.
9. voltage conversion controller according to claim 5, it is characterized in that, wherein said charge-discharge circuit more comprises an oscillating controller, when described oscillating controller rises to one first comparing voltage value and drops to second comparing voltage value respectively at the voltage of described back coupling electric capacity, change the outputting level of described oscillating controller.
10. voltage conversion controller according to claim 8, is characterized in that, wherein said oscillating controller comprises:
One controller input, is coupled to described back coupling end stitch;
One controller output end, in order to export a signal to control conducting or the cut-off of described the first switching current and described second switch electric current;
One first comparator, has two inputs and an output, and its two input is respectively coupled to described controller input and described the first comparative voltage;
One second comparator, has two inputs and an output, and its two input is respectively coupled to described controller input and described the second comparative voltage; And
One sets replacement latch unit, there is a set input, a replacement input and an output, wherein said set input is coupled to the output of described the first comparator, described replacement input is coupled to the output of described the second comparator, and the output of described setting replacement latch unit is coupled to described controller output end.
11. 1 kinds of voltage conversion circuits, is characterized in that, described voltage conversion circuit comprises:
One application circuit, and described application circuit comprises an output, a back coupling end and is coupled to a back coupling electric capacity of described back coupling end; Described output has an output voltage, and couples a current loading; And
One voltage conversion controller, has a back coupling end stitch, is coupled to described back coupling end; Wherein said voltage conversion controller has a first mode and one second pattern;
When wherein said first mode, described output provides modulated described output voltage and gives described current loading for induced current, and described back coupling end stitch provides a back coupling signal, and described back coupling signal is relevant to the size of current of described output voltage or described current loading; When described the second pattern, described output voltage is not modulated, and a count frequency signal of described back coupling end stitch reception fixed cycle property, and the cycle size of described count frequency signal is determined by the capacitance of described back coupling electric capacity.
12. voltage conversion circuits according to claim 11, is characterized in that, described voltage conversion circuit is to be a flyback switch power converter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| TW101145749 | 2012-12-05 | ||
| TW101145749A TWI465015B (en) | 2012-12-05 | 2012-12-05 | Voltage converter circuit and voltage converter controller |
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| CN103856058A true CN103856058A (en) | 2014-06-11 |
| CN103856058B CN103856058B (en) | 2017-01-11 |
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Cited By (2)
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| CN106329929A (en) * | 2015-07-03 | 2017-01-11 | 立锜科技股份有限公司 | Voltage converting circuit and voltage converting controller |
| CN109669061A (en) * | 2019-01-31 | 2019-04-23 | 广州金升阳科技有限公司 | A kind of current sample compensation circuit |
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| US9774252B2 (en) * | 2014-06-30 | 2017-09-26 | Skyworks Solutions, Inc. | Mode control device, voltage converter, and mode control method |
| TWI548186B (en) * | 2014-08-15 | 2016-09-01 | Richtek Technology Corp | Quick Start Circuit and Method of Chi - back Power Supply |
| TWI549407B (en) | 2014-09-09 | 2016-09-11 | 鴻海精密工業股份有限公司 | Multiphase power circuit |
| TWI645657B (en) * | 2017-09-29 | 2018-12-21 | 台達電子工業股份有限公司 | Power conversion device and voltage regulating feedback circuit |
| US10666233B1 (en) * | 2019-02-14 | 2020-05-26 | Winbond Electronics Corp. | Power drop reset circuit for power supply chip and power drop reset signal generating method |
| TWI830355B (en) * | 2022-08-31 | 2024-01-21 | 通嘉科技股份有限公司 | Control methods for interleaved power converter |
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Also Published As
| Publication number | Publication date |
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| CN103856058B (en) | 2017-01-11 |
| TWI465015B (en) | 2014-12-11 |
| TW201424216A (en) | 2014-06-16 |
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