CN103618457A - Efficient switching regulator having self-adaption output circuit driving ability - Google Patents
Efficient switching regulator having self-adaption output circuit driving ability Download PDFInfo
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Abstract
The invention provides an efficient switching regulator having the self-adaption output circuit driving ability. According to the efficient switching regulator having the self-adaption output circuit driving ability, high efficiency can be maintained on a wide load current level. A circuit of the efficient switching regulator responds to a load current and generates one or more control signals and provides switch driving control signals for one or more switches of an output circuit selectively.
Description
Technical field:
The present invention relates to switch voltage-stabilizing circuit.More specifically, the present invention relates to keep circuit and the method for high efficiency switching regulator in wide-range current, circuit working is under a substantially invariable frequency simultaneously.
Background technology:
The object of voltage regulator is to obtain input from voltage source unstable or fluctuation, and provides predetermined and output voltage substantial constant to load.In general, there are two kinds of dissimilar pressurizers: linear voltage regulator and switching regulator.
Linear voltage regulator adopts the element (for example power transistor) together with load series coupled, to control the voltage drop at these element two ends, thereby adjusts the voltage of present load end.In contrast, the switch (for example power transistor) that switching regulator adopts is of coupled connections with load serial or parallel connection.The opening and closing of pressurizer control switch, to regulate the power of supply load.Switching regulator adopts inductive energy storage element, thereby converts current impulse to stable load current.Therefore, the power of switching regulator is sent out with discrete current impulse form, and in a linear voltage regulator, the power of pressurizer is sent out with stable current forms.
For generation current pulse, switching regulator generally includes control circuit, thereby opens and closes switch.The duty ratio of switch (power providing to load is provided for it) can change by several different methods.For example, duty ratio can change by the following method: (1) fixed pulse frequency and change the duty ratio (being pulse width modulation (PWM)) of each pulse, (2) are fixed the duty ratio of each pulse and changed pulse frequency.
And what conventionally adopt is fixed-frequency PWM method, because the method for frequency for a change may cause the appearance of noise, especially in lower duty ratio situation.And voltage noise may affect the performance of the circuit of being powered by switching regulator.Another problem of variable power switch frequency is that the harmonic wave of switching frequency may disturb intermediate frequency (IF) or radio frequency (RF) telecommunication circuit.
No matter adopt which kind of method to control duty ratio, switching regulator is generally all than the efficiency of linear voltage regulator higher (wherein efficiency is the power being provided by adjuster and the ratio that is provided to its power).In linear voltage regulator, bypass elements is generally operational in the ， range of linearity, its range of linearity, the continuous On current of bypass elements.This will cause the continuous power dissipation of transistor.On the contrary, in switching regulator, switch is in off-state (there is no power dissipation under this state) or conducting state (low impedance state has less power dissipation under this state).This species diversity conventionally can cause the minimizing of switching regulator average power consumption when operation.
Poor when larger when the input-output terminal voltage of pressurizer, the difference in above-mentioned efficiency will be more clear.For example, under equivalent function, the efficiency of linear voltage regulator is lower than 25%, and the efficiency of switching regulator can be greater than 75%.
Due to switching regulator, compare have higher efficiency with linear voltage regulator, switching regulator adopts powered battery conventionally, as portable notebook computer and handheld instrument.In such system, for example, when the electric current of switching regulator approaches rated value (disk of notebook computer and hard disk drive are all when work), the efficiency of whole circuit can be very high.Yet efficiency is a function relevant to output current normally, and output current power reduction while reducing.The reduction of this efficiency is generally the loss causing due to console switch pressurizer.In battery powered system, the minimizing of switching regulator efficiency when low output current is just very important, and this will make the lifetime of battery.
In view of the relation between efficiency and output current, traditional switching regulator adopts power mosfet switch conventionally.Two important losses of switching regulator are power loss and the switched drive current losses that switch causes.High-power MOSFET has lower channel impedance, thereby than small-power MOSFET, consumes power still less under given electric current.Yet due to its larger gate regions, high-power MOSFET has higher grid voltage, this causes it under given frequency of operation, than small-power MOSFET, to have larger switched drive current loss.When High Output Current, switched drive current loss does not have dissipation loss remarkable conventionally, and when low output current, switched drive current loss will cause the remarkable reduction of efficiency.Reduce switching frequency and will reduce the current loss of switch driver, still, the variation of frequency is bad method, as discussed above a voicefrequency circuit for some circuit.
In view of the foregoing, provide high efficiency switching regulator to need.
In switch voltage-stabilizing circuit, provide in wide-range current (comprising low output current) that to keep efficient control circuit and method be also needs.
In working in the switch voltage-stabilizing circuit of a constant frequency, provide in wide-range current (comprising low output current) that to keep efficient control circuit and method be also needs.
Summary of the invention:
Therefore, first object of the present invention is to provide a kind of efficient switching regulator.
Second object of the present invention is in switch voltage-stabilizing circuit, provides and in wide-range current (comprising low output current), keeps efficient control circuit and method.
The 3rd object of the present invention is in working in the switch voltage-stabilizing circuit of a constant frequency, provides and in wide-range current (comprising low output current), keeps efficient control circuit and method.
Technical solution of the present invention:
According to the above-mentioned object with other, the invention provides a kind of efficient switch pressurizer with self adaptation driver output circuit capacity, in wide load current level, can keep higher efficiency.This voltage regulator circuit generates one or more control signals in response to load current, and optionally for the one or more switches in output circuit provide switch drive control signal.Varying in size of above-mentioned switch, so can have a switch the most effective under a specific load current level.Under low load current, above-mentioned drive control signal is sent to output circuit by less switching device, and this causes can producing less drive current lost for a given frequency of operation, thereby has increased the efficiency of pressurizer.Under high load currents level, above-mentioned drive control signal is sent to output circuit by larger switching device, and this causes can producing larger drive current lost for a given frequency of operation, but has in this case a Low ESR.
Circuit of the present invention and method can be used for the switch of various types of power transistors, as synchronous and asynchronous switch.In addition, circuit of the present invention and method can be used in dissimilar switching regulator, comprise voltage drop, voltage liter, polarity inversion and flyback configuration circuit.
Contrast patent documentation: CN202854636U pressure stabilizer 201220571447.0
Accompanying drawing explanation:
Fig. 1 is an asynchronous step down switching voltage regulator circuit diagram, and it adopts traditional PWM and hysteresis control circuit;
Fig. 2 is the inductive current oscillogram of high efficiency control circuit in Fig. 1, and it is operated under PWM and sluggish control model;
Fig. 3 is first example of the efficient switch voltage regulator circuit that obtains of a principle according to the present invention, and it adopts asynchronous buck configuration;
Fig. 4 is second example of the efficient switch voltage regulator circuit that obtains of a principle according to the present invention, and its adopts synchronous buck configuration;
Fig. 5 is the 3rd example of the efficient switch voltage regulator circuit that obtains of a principle according to the present invention, and its adopts the configuration of boosting of asynchronous and inverse-excitation type synchro switch combination, and has included self adaptation output circuit in.
Embodiment:
Fig. 1 shows a kind of rough schematic view of known asynchronous step down switching voltage regulator circuit, and in this circuit, a hysteresis control circuit is used to raise the efficiency under low load current level.
With reference to Fig. 1, switching regulator circuit 100 provides the VD V of an adjusting at terminal 102
oUT(for example 5 volts), for driving load 103, be reduced in the drawings a resistance, and it may be a portable communication device or other battery power supply system.During pressurizer 100 work, from power supply, obtain a unadjusted voltage V
in(for example battery of 12 volts), it is coupled to terminal 104.
As comparator 129 indicator current I
lwhile having reached the value of differential amplifier 128 settings, control logic 121 is turn-offed MOSFET134.Work as electric current I
lwhen the voltage producing at resistance 137 two ends surpasses controlled offset voltage 123, this voltage triggered comparator 129.Offset voltage 123 is proportional to the output end voltage V of differential amplifier 128
g.When control logic 121 provides a shutoff pulse that MOSFET134 is turn-offed, I
lflow through in a conventional manner diode 136, but it reduces simultaneously.
As discussed above, power loss is that gate charges electric current and the switching frequency that the gate charge by MOSFET causes causes, and very remarkable when low output current.For example, in order to provide higher efficiency when low load current (be less than maximum rated output 20%), adjuster 100 adopts hysteresis control circuits 140, for replacing pwm control circuit 120 to control conducting and the shutoff of MOSFET134.
During low load current, control selector 150 and allow hysteresis control circuit 140 to control driver 132.Hysteresis control circuit 140 is MOSFET134 conducting, under kind of state, and output voltage V
oUTcan within one period of considerable time, by output capacitance 139, roughly keep stable.The feature of this prior art has reduced the loss in voltage regulator circuit, because MOSFET134 realizes switch under much lower frequency, thereby has reduced gate charges electric current.Between PWM and sluggish control model, switch and can complete manually or automatically.For example, LTC1147 realizes automatic switchover by the rising of the minimum output current under restriction PWM pattern and detection output end voltage.
Under aforesaid operations state (i.e. " lag mode "), load 103 provides power by output capacitor 139 substantially.Hysteresis control circuit 140 monitoring feedback voltage V
fB.
Work as V
fBduring the hysteresis that declines, control circuit 140 makes drive circuit 132 that MOSFET134 is closed, only with hysteresis, when needed output capacitance 139 is charged.If load current keeps enough lowly, electric capacity 139 is by the closure week after date charging at a MOSFET134, MOSFET134 cut-off afterwards.
Therefore, when underload, pressurizer 100 is closed by MOSFET134, is only output capacitance 139 chargings simply.Therefore, V
oUTbetween upper and lower bound threshold value, vibrate.Circuit is adjusted according to load current 140, is output capacitance 139 chargings, thereby even also can keeps higher efficiency under low output current thereby make MOSFET134 closed.
Fig. 2 is the electric current I of inductance 138 of flowing through during PWM and sluggish operator scheme
l schematic diagram.Curve 201 has showed under each switch periods of PWM pattern, I
lalong with the conducting of MOSFET134 and cut-off and increase and reduce.The I that curve 202 represents under lag mode
l.As shown in curve 202, I
lat t
1increase during this time, during this period, thereby MOSFET134 conducting is output capacitance 139 chargings.At t
2during this time, MOSFET134 is turned off, diode 136 conductings, I
lreduce.At t
3during this time, load current is electric capacity 139 electric discharges lentamente, until it reaches predetermined value.Along with reducing of load current, V
fBrate reduction with lower, has extended t
3time.Therefore, the frequency of MOSFET134 conducting reduces, simultaneously corresponding the reducing of gate charges electric current.
Under lag mode, the variation of MOSFET134 switching frequency is not wished to obtain in some applications.For example in voicefrequency circuit, will occur following shortcoming, under enough low load current, switching frequency may be reduced to audiorange.This may cause occurring output voltage noise, thus the voicefrequency circuit that impact is powered by switching regulator.
The lag mode of switching regulator 100 variable frequencies will produce another one shortcoming, and inductance 138 itself may also can produce noise, and this is to adopt the user of voltage regulator circuit mobile device to dislike.
In telecommunication circuit, another shortcoming of variable frequency switching regulator is that the harmonic wave of switching frequency may disturb IF or RF radio frequency communications circuitry.The high order harmonic component of switching frequency may affect IF or RF signal.
The method of the known maximizing efficiency that makes switching regulator is to provide two or more complete switching regulators, and each in them is the most effective under a specific output current, and control circuit is selected output between pressurizer.A shortcoming of this method is to need a plurality of complete pressurizers, and therefore, it is more expensive and heavy than single pressurizer.
The circuit of the switching regulator obtaining according to the present invention and method have overcome the weak point of above-mentioned switching regulator circuit.Fig. 3 shows the constant frequency switching regulator circuit 300 that a principle according to the present invention obtains, and it can keep efficiently in wide-range current, and has an adaptable output circuit.
With reference to Fig. 3, switching regulator 300 also comprises the pwm control circuit 120 in Fig. 1.This pwm control circuit can be the type in Fig. 1, also can utilize other known pwm control circuits to realize.As shown in Figure 3, pwm control circuit 120 is identical with the pwm control circuit 120 in Fig. 1 substantially.Unique be connected (for example, in Fig. 1, hysteresis control circuit 140 is connected to pwm circuit 120, and in Fig. 3, output control circuit 340 is connected to pwm circuit 120) not being both with external circuit.Circuit 300 also comprises and adapts to output circuit 330, output control circuit 340 and control path circuit 350.As described in more detail below, under low load current level, output control circuit 340 and control path circuit 350 cause output circuit 330 to use small-power MOSFET335, rather than high-power MOSFET 134.This feature of the present invention has reduced the power consumption of switch driver, because MOSFET335 has less gate charge than MOSFET134.
According to the present invention, the adaptation output circuit 330 in switching regulator 300 is worked as follows when low load current.Output control circuit 340 comprises comparator 344 and reference voltage source 347, and this reference voltage source provides reference voltage V
rEF2.As above according to the discussion of Fig. 1, the output V of differential amplifier 128
gtherefore in response to reducing of load current, reduce, and as an index of load current.When load current drops to V
gbe less than V
rEF2time, the output of voltage comparator 344 becomes high level.V
rEF2be used to indicate V
g, therefore, no longer needing high-power MOSFET 134, small-power MOSFET335 can provide necessary load current completely.
Each switch driver comprises an idle condition, and when controlling path circuit 350 control logic signal is removed from the input of driver, idle condition is turn-offed the corresponding MOSFET of driver.Therefore, if load current is lower, when the output voltage of comparator 344 is high level, pwm control circuit 120 is controlled the state of MOSFET335, thereby provides necessary electric current for inductance 138.In addition, when the output voltage of comparator 344 is in the situation of high level, high-power MOSFET 134 is not worked, thereby has eliminated the switched drive current loss for its gate charges.
Therefore, according to the present invention, circuit 300 can keep efficiently in wide-range current, and it is operated in a constant frequency simultaneously.In a typical application, V
rEF2can be set up and equal V
g, and V
gthe voltage obtaining for 1/10th o'clock that load current is about maximum rated when output.In this case, pressurizer 300 is switched to small-power MOSFET335 from high-power MOSFET 134.Therefore, the size of small-power MOSFET335 normally high-power MOSFET 134 1/10th.At this moment efficiency is similar to traditional adjuster, and when being operated in higher load current, according to adaptation output circuit of the present invention, the scope of load current can further expand.
Obviously, although the present invention is directed to Fig. 3 discussion, and its pressurizer comprises asynchronous switching circuit, the present invention also can use simultaneous switching circuit.Herein, term " simultaneous switching circuit " refers to the switch that comprises at least two switching transistors, and they cooperatively interact to load, to provide electric current under a stable voltage.Fig. 4 shows the efficient switch voltage regulator circuit with self adaptation output circuit that a principle according to the present invention obtains, and it adopts synchronous buck configuration.
With reference to Fig. 4, switching regulator circuit 400 comprises: pwm control circuit 120, output control circuit 340 and control path circuit 350, these circuit are substantially similar to the circuit in pressurizer 300 in Fig. 3.Circuit 400 also comprises synchro switch output circuit 430, and it replaces the output circuit in Fig. 3.As described in more detail below, output control circuit 340 and control path circuit 350 and make output circuit 430 that a pair of high-power or low power synchronous diverter switch transistor is placed in to operating state.
With reference to Fig. 4, output circuit 430 comprises the following element of output circuit 330 in Fig. 3: top MOSFET134 and 335, driver 132 and 333, electric capacity 131, inductance 138, resistance 137 and electric capacity 139.Output circuit 430 also comprises inductance 438, driver 432 and 433 and bottom MOSFET434 and 435, and wherein MOSFET434 is greater than MOSFET435, and their ratio is identical with the ratio of MOSFET134 and 335.MOSFET to 134 and 434 and MOSFET to 335 and 435, form separately separately simultaneous switching circuit.In response to the high voltage control signal of pwm circuit 120, driver 132 passes through the electric current of inductance 138 by MOSFET134 closure to increase, or driver 333 passes through the electric current of inductance 438 by MOSFET335 closure to increase.In both cases, bottom MOSFET434 and 435 keeps turn-offing.In response to the low-voltage control signal of pwm circuit 120, driver 432 passes through the electric current of inductance 138 by bottom MOSFET434 conducting to reduce, or driver 433 passes through the electric current of inductance 438 by bottom MOSFET435 conducting to reduce.In both cases, top MOSFET134 and 335 keeps turn-offing.According to principle of the present invention, output control circuit 340 is according to the load current of institute's sensing, make to control path circuit 350 by the driving signal loading of pwm circuit 120 to high- power MOSFET driver 132 and 432 or small- power mosfet driver 333 and 433, this is similar to the circuit 300 in Fig. 3.
In addition, inductance 438 provides several advantages.First, because it is used under low load current, so inductance 438 is greater than inductance 138 conventionally.This has reduced the peak current of flow through MOSFET335 and 435, thereby reduces dissipation loss.Second, MOSFET335 and 435 is coupled to inductance 438 rather than inductance 138, when MOSFET335 and 435 whens work have reduced the voltage swing in high- power MOSFET 134 and 434 drain electrodes, thereby reduced, flow through the loss that the capacitance current of MOSFET134 and 434 causes.
Obviously, although the present invention discusses with reference to Fig. 3 and 4, wherein pressurizer is selected two asynchronous switching circuits or two synchronous switching circuits, and the present invention can adapt to size and the type of switch in more complicated pressurizer output circuit.It is evident that equally, pwm control circuit 120 normally designs like this: V
gcomprising slope-compensation element, may be the inaccurate indication of load current thereby make it.Fig. 5 is an efficient switch voltage regulator circuit that principle according to the present invention obtains, and it adopts the switching circuit of asynchronous and synchro switch combination, and includes more complicated self adaptation output circuit in.
With reference to Fig. 5, pressurizer 500 comprises pwm control circuit 120, and the pwm control circuit 120 in its working method and Fig. 3 and 4 is basic identical.But the pwm control circuit 120 in Fig. 5 also comprises that additional outside connects, for the voltage on monitoring resistor 137.Pressurizer 500 also comprises that output circuit 530, output control circuit 540, switching logic 550 and inverse-excitation type cover circuit 560.As described in more detail below, output control circuit 540, control circuit 120 and inverse-excitation type cover circuit 560 and provide feedback information for switching logic 550, thereby when low load current, make output circuit 530 operation MOSFET335 and diodes 535, and when High Output Current, operate MOSFET134 and 434.
Output circuit 530 comprises the following element in Fig. 4: MOSFET134,335 and 434, driver 132,333 and 432, electric capacity 131, inductance 138, resistance 137 and electric capacity 139.Circuit 530 also comprises diode 531(and coupling winding 538 and electric capacity 539 couplings) and 535.MOSFET forms a simultaneous switching circuit to 134 and 434, and MOSFET335 and diode 535 form an asynchronous switching circuit.Coupling winding 538, electric capacity 539 and diode 531 form inverse-excitation type booster circuit, and it provides the output of an enhancing at terminal 502.As discussed in more detail below, switching logic 550 provides synchronized signal for driver 132 and 432, or for driver 333 provides an asynchronous driving signal, so that the electric current of inductance 138 to be provided, thereby keeps the voltage after output 102 outputs regulate.
According to another feature of the present invention, output control circuit 540 direct-detection inductive currents, and prevent as follows current reversal.Output control circuit 540 comprises comparator 344 and reference voltage 347, and its mode of operation is substantially similar to the circuit 340 in Fig. 4.In the preferred embodiment, the value of reference voltage 347 is 0.63V.Output control circuit 540 also comprises hysteresis comparator 546, the voltage that this comparator monitoring current produces by resistance 137, thus a primary current feedback is provided.
According to the present invention, when the voltage at resistance 137 two ends surpasses a hysteresis threshold, the output of comparator 546 becomes high level.Equally according to the present invention, when the lower voltage at resistance 137 two ends and while becoming negative value, the output of comparator 546 becomes low-voltage, thus the reversion of indicator current.The value of hysteresis threshold comparator 546 and resistance 137 is selected, makes comparator 546 change state according to current class, now the high- power MOSFET 134 and 434 in its operation output circuit 530.For example, if the resistance of resistance 137 is 50 milliohms, when inductive current surpasses 300 MAHs, hysteresis threshold is set to 15 millivolts, now high-power MOSFET work.
Switching logic circuit 550 provides driving signal according to the feedback signal of the control signal of pwm circuit 120 and output control circuit 540 for output circuit 530 as follows.Under relatively low levels of current, comparator 344 is output as high level, and comparator 546 is output as low level.Under these conditions, switching logic makes the control signal obtaining from pwm circuit 120 be loaded into driver 333, thereby drives small-power MOSFET335.Equally under these conditions, it is dummy status that switching logic makes driver 132 and 432, makes MOSFET134 and 434 keep turn-offing, as discussed according to Fig. 3 and 4 above.
When the output that becomes low level or comparator 546 when the output of comparator 344 becomes high level, in response to passing through the increase of resistor 137 electric currents, switching logic circuit 550 detects this variation, and the control signal of pwm circuit 120 is removed and be loaded into driver 132 and 432 from driver 333.
Under low current level, drive circuit 333 is closed and shutoff small-power MOSFET335, by the electric current I of inductance 138
leach closed cycle at MOSFET335 increases, and in each shutoff cycle, reduces.If load 103 needs more electric current, the error voltage V of amplifier 128 outputs
gincrease, thereby cause the increase of offset voltage 123.This has caused the increase of comparator 129 activation threshold values, thereby makes closed end cycle and the beginning in the cycle of shutoff.If before a closed end cycle, inductive current I
lbe increased to enough greatly, make the voltage at resistance 137 two ends over the hysteresis threshold of comparator 546, the output of comparator 546 becomes high level, thereby makes the control signal of pwm circuit 120 be loaded into driver 432.When thereby the control signal change state of pwm circuit 120 starts to turn-off the cycle, small-power MOSFET335 is turn-offed driver 333 and driver 432 makes high-power MOSFET 434 conductings.When the end in shutoff cycle is indicated in the output of control logic 121, the output of comparator 546 becomes high level, causes the control signal of pwm circuit 120 to be loaded into driver 132, rather than driver 333.Therefore, high-power MOSFET 134 is in closed cycle conducting subsequently.
According to principle of the present invention, switching logic 550 keeps the simultaneous operation of MOSFET134 and 434, until comparator 546 detects an inductive current I equally
lreverse current.The reversion of electric current may occur in any shutoff cycle, and during this period of time MOSFET434 is closed, and inductance 138 is coupled to ground.When the output of comparator 546 becomes low level, show that comparator 546 has detected a reverse current, switching logic 550 is removed the control signal of pwm circuit 120 immediately from driver 432, MOSFET434 is turn-offed immediately.
If the output voltage of comparator 546 remains low level within the closed cycle subsequently, switching logic 550 is loaded on driver 333 by the control signal obtaining from pwm circuit 120, rather than driver 132, the asynchronous operation of MOSFET335 was opened in the closed cycle subsequently.Therefore, switching logic 550 is that output circuit 530 is selected suitable switching circuit.In the preferred embodiment, switching logic 550 utilizes the output signal of comparator 344 to cover signal as one, if the output signal of comparator 344 is changed into low-voltage, switching logic 550 makes the control signal of pwm circuit 120 be loaded into driver 132 and 432, thereby starts the next closed cycle.
Obviously, in inverse-excitation type boost mode circuit, coupling winding 538, electric capacity 539, diode 531 and terminal 502 under Asynchronous Mode by cisco unity malfunction.MOSFET134 in output circuit 530 and 434 is in synchronous mode of operation lower time, and inductance 138 and coupling winding 538 form the primary and secondary winding of a transformer, thereby produce a voltage that is greater than terminal 102 at terminal 502.At E
2in PEOM circuit, coupling winding 538 makes terminal 502 that the voltage of 12 volts is provided conventionally.Yet as mentioned above, switching logic 550 is selected Asynchronous Mode conventionally, and MOSFET434 is turn-offed, if comparator 546 detects the current reversal in inductance 138, inductance 138 will be by diode 535 and ground isolation.When diode 535 is isolated inductance 138 with ground, inductance 138 and coupling winding 538 can not be used as transformer.
Therefore, according to another feature of the present invention, inverse-excitation type covers circuit 560 signal is provided, to prevent being loaded into switching logic 550 selection Asynchronous Modes while boosting output 502 when a load.Inverse-excitation type covers circuit 560, according to loading condition, high- power MOSFET 134 and 434 is placed in to synchronous mode of operation as follows.Inverse-excitation type covers circuit 560 and comprises resistance 562 and 564, comparator 566, reference voltage 568.
When load is placed in terminal 502, resistance 562 and 564 arrives lower than reference voltage 568V the voltage drop at terminal 569 places
rEF3.This is maintained at the output that causes comparator 566 under a higher voltage.When relatively 566 high voltage is input to switching logic 550, by covering the feedback signal of output control circuit 540, cause switching logic 550 that the control signal of pwm circuit 120 is loaded into sync driver 132 and 432.According to the present invention, when low current, user can be by terminal 569 ground connection to prevent asynchronous operation equally.
Obviously, although the synchro switch pressurizer in the Figure 4 and 5 that principle obtains according to the present invention has been discussed above, it is characterized in that, pressurizer provides load current with two switching devices, but the present invention also can provide load current with a switching device.
Same apparent, although Fig. 3-5 circuit that principle obtains according to the present invention has been discussed above, it is characterized in that, pressurizer adopts two or more output circuits with different size switch, and the present invention also can be improved to the number that changes switch according to the variation of load current.In addition, one drives junction device to select between a plurality of switch drivers, and the present invention also can use a single switch driver.
In addition,, even if above-mentioned switching regulator, by step-down and inverse-excitation type Configuration, also can use the switching regulator configuration of other types according to principle of the present invention, comprise and boosting and polarity inversion configuration.In addition, although switching circuit is for switching regulator in the example of discussing in the above, the switching circuit obtaining according to the present invention is generally applicable to the switch of any type, wherein can select according to operating state the switch of different sizes.
Therefore, the invention provides and be a kind ofly operated in constant frequency and can in wide-range current, keep efficient switching regulator circuit.
Although the present invention embodies by concrete example, above-mentioned example just should not limit the present invention for the present invention is described.It should be pointed out that as long as no departing from essence of the present invention and meeting the definition in claim, on above-mentioned example, make suitable modification and still belong to category of the present invention.
Claims (9)
1. an efficient switch pressurizer with self adaptation driver output circuit capacity, it is characterized in that: this switching regulator circuit has one for being connected to the input of input power, an output that is used to load that regulated output voltage is provided, above-mentioned voltage regulator circuit also comprises: an output circuit is coupling in above-mentioned input and output, for provide load current to above-mentioned load under regulation voltage, this output circuit comprises: a self-adaptive switch circuit, for electric current is coupled to second node from first node (being coupled to input), this self-adaptive switch circuit comprises: the first switching circuit is coupling between above-mentioned first and second nodes, second switch which couple is between above-mentioned first and second nodes, a control circuit is coupled to above-mentioned output circuit, is used to output circuit that a control signal is provided, the regulation voltage of above-mentioned control signal based on (at least partly based on) lead-out terminal place, an output control circuit is coupled to above-mentioned control circuit, based on (at least partly based on) above-mentioned load current, provides an output control circuit signal, control path circuit for one and be coupled to above-mentioned self-adaptive switch circuit and output control circuit, according to above-mentioned output control circuit signal, be the control signal selecting paths (being at least in above-mentioned the first and second switching circuits) in control circuit, thereby even if under very low load current, make switching regulator circuit keep efficient.
2. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 1, it is characterized in that: above-mentioned the first and second switching circuits all comprise a switching transistor, and the switching transistor in the first switching circuit is greater than the switching transistor in second switch circuit.
3. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 1, it is characterized in that: above-mentioned control signal is used to open or close in the first and second switching circuits, keep other switching circuits in off-state simultaneously.
4. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 1, it is characterized in that: above-mentioned control circuit comprises a differential amplifier, be used for providing the first feedback signal, difference between this first feedback signal and output end voltage and a reference voltage is proportional, and above-mentioned control path circuit is placed in the first or second state according to the first feedback signal by pressurizer.
5. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 1, it is characterized in that: above-mentioned output circuit also comprises a sensing resistor that is coupled to output, this sensing resistor produces one according to the electric current that is supplied to output and detects voltage, and above-mentioned control path circuit is placed in the first or second state according to this detection voltage by pressurizer.
6. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 5, it is characterized in that: in response to the electric current that is supplied to load, the operating state of above-mentioned pressurizer is determined by output control circuit, if above-mentioned detection voltage surpasses first threshold, controlling path circuit makes pressurizer be operated in the first state, if lower than Second Threshold, controlling path circuit, above-mentioned detection voltage make pressurizer be operated in the second state.
7. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 6, is characterized in that: above-mentioned switch controlling signal has a constant frequency.
8. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 7, is characterized in that: above-mentioned switch controlling signal is pulse width modulating signal.
9. a kind of efficient switch pressurizer with self adaptation driver output circuit capacity according to claim 8, is characterized in that: when above-mentioned detection voltage surpasses the first feedback signal, switch controlling signal is disconnected.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109905031A (en) * | 2017-12-07 | 2019-06-18 | 硅谷实验室公司 | Isolated power transmitting device with integrated transformer and voltage controller |
| CN110890840A (en) * | 2018-09-10 | 2020-03-17 | 三星电子株式会社 | Semiconductor circuit having a plurality of transistors |
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|---|---|---|---|---|
| US5731731A (en) * | 1995-05-30 | 1998-03-24 | Linear Technology Corporation | High efficiency switching regulator with adaptive drive output circuit |
-
2013
- 2013-11-27 CN CN201310613168.5A patent/CN103618457A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5731731A (en) * | 1995-05-30 | 1998-03-24 | Linear Technology Corporation | High efficiency switching regulator with adaptive drive output circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109905031A (en) * | 2017-12-07 | 2019-06-18 | 硅谷实验室公司 | Isolated power transmitting device with integrated transformer and voltage controller |
| CN109905031B (en) * | 2017-12-07 | 2021-12-03 | 天工方案公司 | Isolated power transmission device with integrated transformer and voltage controller |
| CN110890840A (en) * | 2018-09-10 | 2020-03-17 | 三星电子株式会社 | Semiconductor circuit having a plurality of transistors |
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