CN104426373A - Switching Power Supply Voltage Regulator - Google Patents

Abstract

The invention provides a switching power supply voltage regulator, which comprises a Pulse Width Modulation (PWM) generating circuit for generating a PWM signal, an output circuit and a feedback circuit. The feedback circuit provides a feedback signal according to the output voltage of the output circuit. The output circuit comprises an inductor, a plurality of upper and lower bridge switches and a driver. The upper and lower bridge switches comprise a first transistor and a second transistor. When the inductor needs to be charged, the driver selectively conducts the corresponding first transistors in the upper and lower bridge switches according to the second feedback signal, and controls the conduction time of the conducted first transistors according to the PWM signal.

Description

Switching Power Supply Voltage Regulator

technical field

The invention relates to a switching power supply voltage regulator.

Background technique

Power is usually supplied to loads, such as central processing unit (CPU), memory, and controller, etc., through a switching power supply voltage regulator. The switching power supply voltage regulator is generally composed of a driver, a plurality of upper and lower bridge switches and inductors, wherein the plurality of upper and lower bridge switches are connected in parallel, and each upper and lower bridge switch is composed of a first transistor and a second transistor constitute. The driver charges and discharges the inductor by turning on the first transistor and the second transistor alternately, so as to provide an output voltage for the load.

At present, according to the power of the load, the load is divided into light load and heavy load with different degrees of load. Regardless of whether the load is a light load or a heavy load, when the inductance needs to be charged, the driver drives the first transistors in the plurality of upper and lower bridge switches to be turned on and the second transistors to be turned off, so that the power supply The inductance is charged through the first transistors in the plurality of upper and lower bridge switches respectively; when the inductance needs to be discharged, the driver drives the second transistors in the plurality of upper and lower bridge switches to be turned on and the first transistors are all turned off, so that the inductance is discharged through the second transistors in the plurality of upper and lower bridge switches respectively.

However, since the switching power supply voltage regulator either drives the first transistors in the multiple upper and lower bridge switches to be turned on and the second transistors are all turned off in the process of generating the above-mentioned output voltage at the same time, or drives the multiple The second transistors in the upper and lower bridge switches are all turned on, and the first transistors are all turned off. Therefore, the switching power supply voltage regulator is inconvenient to output the actual required load current for loads of different degrees of severity. Compared with heavy loads, for light loads and medium loads, the load current output by the switching power supply voltage regulator is larger than the actual required load current, resulting in lower power consumption for light loads and medium loads. high.

Contents of the invention

In order to solve the technical problem that the switching power supply voltage regulator in the prior art cannot output a corresponding load current according to the load power, it is necessary to provide a switching power supply voltage regulator that can output a corresponding large load current according to the load power.

A switching power supply voltage regulator for driving a load, comprising: a pulse width modulation signal generation circuit, the pulse width modulation signal generation circuit generates a pulse width modulation signal; an output circuit, the output circuit receives the pulse width modulation signal and A power supply voltage from a power supply, and correspondingly adjusting the power supply voltage to an output voltage of a corresponding size according to the pulse width modulation signal, so as to drive the load to work; a feedback circuit, the feedback circuit correspondingly outputs a first feedback signal according to the output voltage For the pulse width modulation signal generation circuit, the pulse width modulation signal generation circuit correspondingly adjusts the output pulse width modulation signal according to the first feedback signal, so that the output circuit outputs a stable output voltage to the corresponding load, and at the same time, the The feedback circuit further outputs a second feedback signal representing load power to the output circuit according to the output voltage, so that the output circuit adjusts the load current output to the load according to the second feedback signal. The output circuit includes: an output terminal, which outputs the output voltage to the load; an inductor, which includes a first terminal and a second terminal, and the second terminal is connected to the output terminal; a plurality of upper and lower bridge switches, each The upper and lower bridge switches include a first transistor and a second transistor. The first transistor includes a control terminal, a first conduction terminal and a second conduction terminal. The second transistor includes a control terminal, a first conduction terminal and a second conduction terminal. Conduction end, the first conduction end of the first transistor is connected to the power supply, the second conduction end of the second transistor is grounded, the second conduction end of the first transistor is connected to the first conduction end of the second transistor The through end is connected, and an output node is defined between the two, the output nodes of each upper and lower bridge switches are connected, and the output node is connected to the first end of the inductor; and a driver, the driver is connected to the plurality of upper and lower bridge switches. The control terminal of the first transistor is connected to the control terminal of the second transistor, and when the inductance needs to be charged, the driver correspondingly controls the number of conductions of the first transistor in the plurality of upper and lower bridge switches according to the second feedback signal, And correspondingly control the conduction time of the first transistor that is turned on according to the pulse width modulation signal, so that the power supply voltage charges the inductance through the first transistor that is turned on; when the inductance needs to be discharged, the driver According to the second feedback signal, the number of conduction of the second transistors in the plurality of upper and lower bridge switches is correspondingly controlled, and the conduction time of the conduction second transistors is correspondingly controlled according to the pulse width modulation signal, so that the inductors pass through the conduction respectively. The second transistor that is turned on discharges. Wherein, when the inductor needs to be charged, the driver selectively turns on one or more first transistors in the plurality of upper and lower bridge switches according to the second feedback signal.

A switching power supply voltage regulator for driving a load, comprising: a pulse width modulation signal generation circuit, the pulse width modulation signal generation circuit generates a pulse width modulation signal; an output circuit, the output circuit receives the pulse width modulation signal and A power supply voltage from a power supply, and correspondingly adjusting the power supply voltage to an output voltage of a corresponding size according to the pulse width modulation signal, so as to drive the load to work; a feedback circuit, the feedback circuit correspondingly outputs a first feedback signal according to the output voltage For the pulse width modulation signal generation circuit, the pulse width modulation signal generation circuit correspondingly adjusts the output pulse width modulation signal according to the first feedback signal, so that the output circuit outputs a stable output voltage to the corresponding load, and at the same time, the The feedback circuit further outputs to the output circuit a second feedback signal corresponding to the weight of the load according to the output voltage, so that the output circuit correspondingly adjusts the load current output to the load according to the second feedback signal. The output circuit includes: an output end, the output end outputs the output voltage to the load; an inductance, the inductance includes a first end and a second end, and the second end serves as the output end or is connected to the output end; a plurality of upper and lower Bridge switch, each upper and lower bridge switch includes a first transistor and a second transistor, the first transistor includes a control terminal, a first conduction terminal and a second conduction terminal, the second transistor includes a control terminal, a first conduction terminal The conducting end and the second conduction end, the first conduction end of the first transistor is connected to the power supply, the second conduction end of the second transistor is grounded, the second conduction end of the first transistor is connected to the second The first conduction ends of the transistors are connected, and an output node is defined between the two, the output nodes of the upper and lower bridge switches are connected, and the output node is connected with the first end of the inductor, wherein the plurality of upper and lower bridge switches The first transistor is divided into a plurality of first switch groups, each first switch group includes at least one first transistor, the number of first transistors in each first switch group is different from each other, and the second transistors of the plurality of upper and lower bridge switches Divided into a plurality of second switch groups, each second switch group includes at least one second transistor, the number of second transistors in each second switch group is different from each other; the driver, the driver and the plurality of upper and lower bridge switches The control terminal of the first transistor is connected to the control terminal of the second transistor. When the inductance needs to be charged, the driver correspondingly controls the first transistor in the first switch group to be turned on according to the second feedback signal, and The conduction time of the first transistor that is turned on is correspondingly controlled according to the pulse width modulation signal, so that the power supply voltage charges the inductance through the first transistor that is turned on; when the inductance needs to be discharged, the driver according to The second feedback signal correspondingly controls the conduction of the second transistors in a second switch group, and correspondingly controls the conduction time of the conduction second transistors according to the pulse width modulation signal, so that the inductors respectively pass through the conduction The second transistor discharges. Wherein, when the inductor needs to be charged, the driver selectively turns on all the first transistors in a first switch group according to the second feedback signal.

Since the switching power supply voltage regulator of the present invention can selectively turn on the corresponding first transistor and the second transistor according to the weight of the load or the load power, the switching power supply voltage regulator can control the weight of the load or the load power The power respectively outputs substantially the same current as the load current actually required by the load.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of the first embodiment of the switching power supply voltage regulator of the present invention.

FIG. 2 is a schematic diagram of the circuit structure of the second embodiment of the switching power supply voltage regulator of the present invention.

Description of main component symbols

Switching Power Supply Voltage Regulator 10, 20 power supply 100 PWM signal generating circuit 11 load 200 output circuit 12, 22 feedback circuit 13 driver 121, 221 Upper and lower bridge switch 123, 223 inductance 125, 225 output 127, 227 output terminal 121a, 221a first transistor T11, T21 second transistor T12, T22 Control terminal G11, G12, G21 G22 first conduction terminal S11, S12 second conduction terminal D11, D12 output node N first switch group A1 second switch group A2 second end a second end b The output voltage Vout first feedback signal F11 second feedback signal F12, F22 load current I _d voltage Vin PWM signal Spwm the the

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of the circuit structure of the first embodiment of the switching power supply voltage regulator of the present invention. The switching power supply voltage regulator 10 is connected to the power supply 100 and the load 200 for regulating the power supply voltage Vin output by the power supply 100 and generating a corresponding output voltage Vout to supply power to the load 200 . The switching power supply voltage regulator 10 includes a pulse width modulation (Pulse Width Moudle, PWM) signal generating circuit 11 , an output circuit 12 and a feedback circuit 13 . The PWM signal generating circuit 11 is used to generate the PWM signal Spwm. The output circuit 12 correspondingly generates an output voltage Vout according to the PWM signal Spwm output by the PWM signal generating circuit 11 , and provides the output voltage Vout to the load 200 . The feedback circuit 13 correspondingly outputs the first feedback signal F11 to the PWM signal generating circuit 11 according to the output voltage Vout, so as to control the conduction time or non-conduction time of the PWM signal Spwm generated by the PWM signal generating circuit 11, and then control The output circuit 12 can output a stable output voltage Vout for loads 200 with different powers. Wherein, in this embodiment, the conduction time refers to the time when the PWM signal Spwm is at a high level, and the non-conduction time refers to the time when the PWM signal Spwm is at a low level. However, in other modified embodiments, the conduction time may also refer to the time when the PWM signal Spwm is at a low level, and the non-conduction time refers to the time when the PWM signal Spwm is at a high level. At the same time, the feedback circuit 13 further outputs a second feedback signal F12 representing the severity of the load to the output circuit 12 according to the output voltage Vout, and the output circuit 12 adjusts the load current I output to the load 200 according to the second feedback signal F12. _d .

The output circuit 12 includes a driver 121 , a plurality of upper and lower bridge switches 123 , an inductor 125 and an output terminal 127 . The driver 121 includes a plurality of output terminals 121a. Each of the upper and lower bridge switches 123 includes a first transistor T11 and a second transistor T12. The first transistor T11 includes a control terminal G11 , a first conduction terminal S11 and a second conduction terminal D11 . The second transistor T12 includes a control terminal G12, a first conduction terminal S12, and a second conduction terminal D12. The control terminal G11 of the first transistor T11 and the control terminal G12 of the second transistor T12 are both connected to the output terminal 121 a of the driver 121 . The first conduction terminal S11 of the first transistor T11 is connected to the power source 100 . The second conduction terminal D12 of the second transistor T12 is grounded. The second conduction terminal D11 of the first transistor T11 is connected to the first conduction terminal S12 of the second transistor T12, and an output node N is defined therebetween. The output nodes N of the respective upper and lower bridge switches 123 are connected to each other. The inductor 125 includes a first end a and a second end b. The first end a is connected to the output node N of each upper and lower bridge switch 123 , and the second end b serves as the output end 127 or is connected to the output end 127 . In this embodiment, the first transistor T11 and the second transistor T12 in each upper and lower bridge switch 123 are both NMOS transistors, correspondingly, the control terminals G11 and G12 are both gates, and the first conduction terminals S11, Both S12 are sources, and the second conduction terminals D11 and D12 are both drains. In other modified embodiments, the first transistor T11 and the second transistor T12 in each upper and lower bridge switch 123 can also be PMOS transistors or a combination of NMOS transistors and PMOS transistors, as long as the driver 121 provides corresponding driving signals. .

Further, the first transistors T11 of the plurality of upper and lower bridge switches 123 are divided into a plurality of first switch groups A1, each first switch group A1 includes at least one first transistor T11, and the first transistor T11 in each first switch group A1 The numbers of transistors T11 are different from each other. The second transistors T12 of the plurality of upper and lower bridge switches 123 are divided into a plurality of second switch groups A2, each second switch group A2 includes at least one second transistor T12, and the second transistor T12 in each second switch group A2 The quantities are different from each other. The control terminals of the transistors belonging to the same first or second switch group A1 , A2 are all connected to the same output terminal 121 a of the driver 121 . In this embodiment, the number of the plurality of first switch groups A1 is the same as the number of the plurality of second switch groups A2. The number of the first transistors T11 in each first switch group A1 is correspondingly the same as the number of the second transistors T12 in a second switch group A2. For the first switch group A1 and the second switch group A2 having the same number of transistors, preferably, each first transistor T11 in the first switch group A1 is connected to a second transistor T12 in the second switch group A2 The upper and lower bridge switches 123 are formed.

In other modified implementation manners, the number of first transistors T11 in each first switch group A1 is not uniformly corresponding to the number of second transistors T12 in a second switch group A2, that is, each first transistor T11 The number of first transistors T11 in a switch group A1 is different from the number of second transistors T12 in each second switch group A2; or the number of first transistors T11 in a part of the first switch group A1 is different from that in a part of the second switches The numbers of the second transistors T12 in the group A2 are respectively the same, and the numbers of the first transistors T11 in the other part of the first switch group A1 are different from the numbers of the second transistors T12 in the other part of the second switch group A2. It should be noted that the division of the plurality of first switch groups A1 and the plurality of second switch groups A2 is based on the severity of the load 200 , and this process is obtained through experimental measurements in advance. In the electrical field, the load 200 is usually classified into heavy load, medium load and light load according to the power of the load 200 . Wherein, the power of the heavy load, the medium load and the light load decreases sequentially. In addition, sub-heavy loads may be further divided between heavy loads and medium loads, and sub-medium loads may be further divided between medium loads and light loads to subdivide the load 200 . Correspondingly, when the load 200 is roughly divided into three light-heavy types of loads, such as heavy load, medium load and light load, each of the three light-heavy types of loads can include power similar to or meet a predetermined power range multiple loads; when subdividing the load 200, the number of loads satisfying the same light and heavy type becomes less, and even the number of each light and heavy type of load is only one, that is, as long as the load power is different, it will be Defined as a light-heavy type of load. Therefore, corresponding to the number of divided loads 200 of different degrees, the number of the first switch group A1 and the second switch group A2 and the number of transistors in each of the first switch group A1 and the second switch group A2 are correspondingly obtained. quantity.

The working principle of the switching power supply voltage regulator 10 is as follows:

When the inductance 125 needs to be charged, the driver 121 correspondingly controls the first transistors T11 in the first switch group A1 to be turned on according to the second feedback signal F12, and correspondingly controls the turned-on first transistor T11 according to the PWM signal Spwm The conduction time of a transistor T11, so that the power supply voltage Vin charges the inductance 125 through the conduction first transistor T11; when the inductance 125 needs to be discharged, the driver 121 according to the second feedback signal F12 Correspondingly control the conduction of the second transistor T12 in the second switch group A2, and correspondingly control the conduction time of the conduction second transistor T12 according to the PWM signal Spwm, so that the inductor 125 respectively passes through the conduction of the second transistor T12 Transistor T12 discharges. Wherein, for loads 200 with different degrees of severity, the driver 121 correspondingly controls the operation of different first switch groups A1 to charge the inductor 125 according to the second feedback signal F12, and correspondingly controls the operation of different second switch groups A2 to The inductance 125 is discharged.

The heavier the load 200 is, the driver 121 correspondingly controls the operation of the first switch group A1 having a larger number of first transistors T11 according to the second feedback signal F12 to charge the inductance 125, and correspondingly controls the operation of the first switch group A1 having a larger number of first transistors T11 The second switch group A2 of the second transistor T12 works to discharge the inductance 125; on the contrary, the lighter the load 200, the driver 121 correspondingly controls the first transistor T11 with a smaller number according to the second feedback signal F12 The first switch group A1 is operated to charge the inductance 125 , and the second switch group A2 with a smaller number of second transistors T12 is correspondingly controlled to work to discharge the inductance 125 .

For loads 200 with the same severity, the driver 121 correspondingly controls the operation of the same first switch group A1 to charge the inductor 125 according to the second feedback signal F12, and correspondingly controls the operation of the same second switch group A2 to charge the inductance 125. The inductor 125 is discharged.

Since the load 200 is heavier, the number of first transistors T11 turned on is more, and each turned on first transistor T11 is equivalent to a resistor connected between the power supply 100 and the inductor 125, and each turned on The first transistor T11 is connected in parallel. According to the circuit principle, the larger the number of resistors connected in parallel, the smaller the total resistance value and smaller than the resistance value of each resistor connected in parallel. Therefore, the heavier the load 200, the more The smaller the total resistance connected between the power source 100 and the inductor 125 is, the larger the load current I _d output to the load 200 is. Similar to the working principle of the first switch group A1, the working principle of the second switch group A2 will not be repeated for simplicity. On the contrary, when the load 200 is lighter, the load current _Id outputted by the switching power supply voltage regulator 10 to the load 200 is smaller, which is closer to the load current actually required by the load 200 . Therefore, the electric energy consumed by the load 200 becomes smaller.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram of the circuit structure of the second embodiment of the switching power supply voltage regulator of the present invention. The structure of the switching power supply voltage regulator 20 of the second embodiment is basically the same as that of the switching power supply voltage regulator 10 of the first embodiment. The control terminals G22 of the switching power supply voltage regulator 10 control the conduction of the first transistor T11 and the second transistor T12 according to the degree of load 200. Quantity, however, the switching power supply voltage regulator 20 of the two embodiments is to control the conduction quantity of the first transistor T21 and the second transistor T22 according to the different power of the load 200, that is, as long as the power of the load 200 is different, the switch The power supply voltage regulator 20 correspondingly controls the conducting quantity of the first transistor T21 and the second transistor T22 to change. In the second embodiment, the driver 221 correspondingly adjusts the load current _Id output to the load 200 according to the second feedback signal F22 representing the load power.

The greater the power of the load 200, when the inductance 225 needs to be charged, the driver 221 correspondingly controls the number of first transistors in the plurality of upper and lower bridge switches 223 to turn on T21 according to the second feedback signal F22; When the inductor 225 is discharged, the driver 221 correspondingly controls the number of the second transistors in the plurality of upper and lower bridge switches 223 to be turned on T22 according to the second feedback signal F22 . Conversely, the smaller the power of the load 200 is, when the inductance 225 needs to be charged, the driver 221 correspondingly controls the number of first transistors in the plurality of upper and lower bridge switches 223 to turn on T21 according to the second feedback signal F22; When the inductance 225 needs to be discharged, the driver 221 correspondingly controls the number of the second transistors in the plurality of upper and lower bridge switches 223 to be turned on T22 according to the second feedback signal F22 to be smaller. Preferably, the driver 221 alternately controls the conduction of the first transistor T21 and the second transistor T22 in the same upper and lower bridge switch 223 to charge and discharge the inductor 225 .

Claims (16)

1. for driving a switch power supply voltage regulator for loaded work piece, it is characterized in that: this switch power supply voltage regulator comprises:

Pulse width modulating signal produces circuit, and this pulse-width modulation signal generating circuit produces pulse width modulating signal;

Output circuit, this output circuit receives this pulse width modulating signal and the supply voltage from a power supply, and is the output voltage of a corresponding size according to this this supply voltage of pulse width modulating signal correspondence adjustment, to drive described loaded work piece;

Feedback circuit, this feedback circuit exports first according to this output voltage correspondence and feeds back signal to this pulse width modulating signal generation circuit, this pulse width modulating signal produces circuit and adjusts according to this first feedback signal correspondence the pulse width modulating signal exported, to make the output voltage of this output circuit stable output to corresponding load, simultaneously, this feedback circuit exports second of sign bearing power according to this output voltage correspondence further and feeds back signal to this output circuit, the load current of load is exported to according to this second feedback signal correspondence adjustment to make this output circuit,

This output circuit comprises:

Output, this output exports this output voltage to this load;

Inductance, this inductance comprises first end and the second end, and this second end is connected with this output;

Multiple upper bridge switch, on each, bridge switch comprises a first transistor and a transistor seconds, this the first transistor comprises control end, first conduction terminal and the second conduction terminal, this transistor seconds comprises control end, first conduction terminal and the second conduction terminal, first conduction terminal of this first transistor is connected with this power supply, second conduction terminal ground connection of this transistor seconds, second conduction terminal of this first transistor is connected with the first conduction terminal of this transistor seconds, and define an output node therebetween, the output node of each upper bridge switch is connected, this output node is connected with the first end of this inductance, and

Driver, this driver is all connected with the control end of transistor seconds with the control end of the first transistor in the plurality of upper bridge switch, when needs charge to this inductance, this driver controls the quantity of the first transistor conducting in the plurality of upper bridge switch according to this second feedback signal correspondence, and the ON time of the first transistor of conducting is controlled according to this pulse width modulating signal correspondence, this inductance is charged respectively by the first transistor of conducting to make this supply voltage; When needs discharge to this inductance, this driver controls the quantity of transistor seconds conducting in the plurality of upper bridge switch according to this second feedback signal correspondence, and the ON time of the transistor seconds of conducting is controlled according to this pulse width modulating signal correspondence, discharge respectively by the transistor seconds of conducting to make this inductance;

Wherein, when needs charge to this inductance, this driver is according to the first transistor corresponding in the plurality of upper bridge switch of this second feedback signal selectivity conducting.

2. switch power supply voltage regulator as claimed in claim 1, is characterized in that: bearing power is different, the quantity that this driver controls the first transistor conducting according to this second feedback signal is different.

3. switch power supply voltage regulator as claimed in claim 2, it is characterized in that: bearing power is larger, the quantity of the first transistor conducting is more.

4. as the switch power supply voltage regulator in claim 1-3 as described in any one claim, it is characterized in that: wherein, when needs discharge to this inductance, this driver is according to transistor seconds corresponding in the plurality of upper bridge switch of this second feedback signal selectivity conducting.

5. switch power supply voltage regulator as claimed in claim 4, is characterized in that: bearing power is different, the quantity that this driver controls transistor seconds conducting according to this second feedback signal is different.

6. switch power supply voltage regulator as claimed in claim 5, it is characterized in that: bearing power is larger, the quantity of this transistor seconds conducting is more.

7. switch power supply voltage regulator as claimed in claim 6, it is characterized in that: for the load that watt level is identical, this inductance is when carrying out charging and discharging, and in the plurality of upper bridge switch, the quantity of the first transistor conducting is identical with the quantity of transistor seconds conducting.

8. switch power supply voltage regulator as claimed in claim 7, is characterized in that: this driver alternately controls the first transistor in same upper bridge switch and transistor seconds conducting, carries out discharge and recharge to this inductance.

9. for driving a switch power supply voltage regulator for loaded work piece, it is characterized in that: this switch power supply voltage regulator comprises:

Pulse width modulating signal produces circuit, and this pulse-width modulation signal generating circuit produces pulse width modulating signal;

Output circuit, this output circuit receives this pulse width modulating signal and the supply voltage from a power supply, and is the output voltage of a corresponding size according to this this supply voltage of pulse width modulating signal correspondence adjustment, to drive described loaded work piece;

Feedback circuit, this feedback circuit exports first according to this output voltage correspondence and feeds back signal to this pulse width modulating signal generation circuit, this pulse width modulating signal produces circuit and adjusts according to this first feedback signal correspondence the pulse width modulating signal exported, to make the output voltage of this output circuit stable output to corresponding load, simultaneously, this feedback circuit further according to this output voltage correspondence export characterize load weight different second feed back signal to this output circuit, the load current of load is exported to according to this second feedback signal correspondence adjustment to make this output circuit,

This output circuit comprises:

Output, this output exports this output voltage to this load;

Inductance, this inductance comprises first end and the second end, and this second end is as this output or go out to hold with this and be connected;

Multiple upper bridge switch, on each, bridge switch comprises a first transistor and a transistor seconds, this the first transistor comprises control end, first conduction terminal and the second conduction terminal, this transistor seconds comprises control end, first conduction terminal and the second conduction terminal, first conduction terminal of this first transistor is connected with this power supply, second conduction terminal ground connection of this transistor seconds, second conduction terminal of this first transistor is connected with the first conduction terminal of this transistor seconds, and define an output node therebetween, the output node of each upper bridge switch is connected, this output node is connected with the first end of this inductance, wherein, the first transistor of the plurality of upper bridge switch is divided into multiple first switches set, each first switches set comprises at least one the first transistor, the quantity of the first transistor in each first switches set is different from each other, the transistor seconds of the plurality of upper bridge switch is divided into multiple second switch group, each second switch group comprises at least one transistor seconds, the quantity of the transistor seconds in each second switch group is different from each other,

Driver, this driver is all connected with the control end of transistor seconds with the control end of the first transistor in the plurality of upper bridge switch, when needs charge to this inductance, this driver controls the equal conducting of the first transistor in one first switches set according to this second feedback signal correspondence, and the ON time of the first transistor of conducting is controlled according to this pulse width modulating signal correspondence, this inductance is charged respectively by the first transistor of conducting to make this supply voltage; When needs discharge to this inductance, this driver controls the equal conducting of transistor seconds in a second switch group according to this second feedback signal correspondence, and the ON time of the transistor seconds of conducting is controlled according to this pulse width modulating signal correspondence, discharge respectively by the transistor seconds of conducting to make this inductance;

Wherein, when needs charge to this inductance, this driver is according to the whole the first transistors in this second feedback signal selectivity conducting one first switches set.

10. switch power supply voltage regulator as claimed in claim 9, is characterized in that: load light and heavy degree is different, and this driver selects the whole the first transistors in different first switches set of conducting according to this second feedback signal.

11. switch power supply voltage regulators as claimed in claim 10, is characterized in that: load is heavier, and this driver selects the first switches set work with the more the first transistors of quantity according to this second feedback signal.

12. as the switch power supply voltage regulator in claim 9-11 as described in any one claim, it is characterized in that: when needs discharge to this inductance, this driver is according to the whole transistor secondses in this second feedback signal selectivity conducting one second switch group.

13. switch power supply voltage regulators as claimed in claim 12, is characterized in that: load light and heavy degree is different, and this driver selects the whole transistor secondses in the different second switch group of conducting according to this second feedback signal.

14. switch power supply voltage regulators as claimed in claim 13, is characterized in that: load is heavier, and this driver selects the second switch group work with the more transistor secondses of quantity according to this second feedback signal.

15. switch power supply voltage regulators as claimed in claim 14, it is characterized in that: for the load that light and heavy degree is identical, this inductance is when carrying out charging and discharging, and this driver selects same first switches set and same second switch group to work according to this second feedback signal.

16. switch power supply voltage regulators as claimed in claim 15, is characterized in that: the plurality of first switches set is identical with the quantity of the plurality of second switch group.