CN204316333U - Electronic equipment - Google Patents

Abstract

A kind of electronic equipment can comprise switching converter, is configured to input voltage to be converted to output voltage, and under operating in pulse skipping mode based on control signal alternative.Switching converter can comprise comparator, has the first input being configured to receive error signal, is configured to the second input receiving skip mode reference signal, and is configured to the output producing control signal.Can configure with reference to generator to produce skip mode reference signal according to the difference between output voltage and input voltage.

Description

Electronic equipment

Technical field

The disclosure relates to DC to DC switchover power converter, and relates more specifically to the switchover power converter reducing powder consumption of electronic equipment.

Background technology

When technology develops, the function of the hand-held battery powered electronic equipment of such as cell phone and panel computer and so on, disposal ability and shielding resolution increase.When client now than the past for use these devices cost the cycle more time time, there is the market demand these devices to long battery life.But meanwhile, conveniently portability and strengthen the aesthetic of these devices, has occurred for the device market demand little as far as possible under given screen size.These market demands can be mutually internally inconsistent, be the size of battery in aggrandizement apparatus, but the growth of this battery size can cause device own dimensions to increase as the plain mode increasing battery life.

The battery life of growing apparatus and a kind of mode that plant bulk can not be caused to increase can be the power consumption reducing device.Finally, these devices can switch between the aggressive mode of device n-back test initiatively and the standby mode of the wherein passive n-back test of device or not even n-back test wherein.Because these devices can in standby mode than spending the more time in the active mode, the reduction of power consumption can cause the growth greatly of battery life in standby mode.

These electronic equipments can adopt power supply with to they circuit supplies.The output of battery can be converted to consistent and available electric energy by power supply, and switchover power converter can be used as power supply in some cases.This switching electric energy transducer can adopt pulse width modulation (PWM) technology to control to be delivered to the electric energy of circuit in the active mode.When PWM is effective for control to the electric energy that circuit is carried in the active mode, different modulation techniques can be needed for the electric energy controlled to circuit conveying under Passive Mode.Such as, pulse frequency modulated (PFM) pattern or pulse can be needed to skip modulation (PSM) pattern for the electric energy controlled to circuit conveying under Passive Mode, because these patterns can effectively operate be in circuit under Passive Mode and less electric energy that delivery ratio should be carried by PWM technology, thus reduce power consumption.

Vernier control for the transformation threshold value of switching converter between PWM and PFM/PSM pattern can contribute to reducing power consumption further, and the battery life of therefore growing apparatus.Finally, the circuit of this transformation threshold value of research and development energy vernier control is needed.

Utility model content

There is provided this utility model content to introduce the selection to the concept be described in further detail in following detail specifications.The utility model content not intended to be identify key or the essential characteristic of claimed theme, also and not intended to be is used for the auxiliary scope limiting claimed theme.

According to an aspect of the present disclosure, a kind of electronic equipment is provided, comprises: switching converter, be configured to input voltage to be converted to output voltage, and under operating in pulse skipping mode based on control signal alternative; Described switching converter comprises comparator, and described comparator has the first input being configured to receive error signal, is configured to the second input receiving skip mode reference signal, and is configured to the output producing described control signal; And with reference to generator, be configured to produce described skip mode reference signal according to the difference between described output voltage and described input voltage.

Alternatively, described switching converter comprises error amplifier further, described error amplifier has the first input being configured to receive the feedback signal obtained from described output voltage, is configured to the second input receiving error reference signal, and is configured to the output producing described error signal.

Alternatively, described reference generator comprises: the first current feedback circuit, is configured to produce the first electric current according to described input voltage; Second current feedback circuit, is configured to produce the second electric current according to described output voltage; Difference circuit, is configured to produce difference current according to the difference between described first electric current and described second electric current; And change-over circuit, be configured to described difference current to be converted to described skip mode reference signal.

Alternatively, described change-over circuit comprises: the pairing of transistor, is configured to export changing voltage; And first amplifier, there is the first input being configured to receive described changing voltage, be configured to the second input receiving error reference signal, and be configured to the output producing difference voltage according to the difference between described changing voltage and described error reference signal.

Alternatively, the pairing of described transistor comprises: the first transistor, has the first conducting terminal being coupled to described difference current, is coupled to the control terminal of described difference current, and the second conducting terminal; And transistor seconds, there is the first conducting terminal of the second conducting terminal being coupled to described the first transistor, be coupled to the control terminal of described difference current, and be configured to the second conducting terminal being coupled to the output of described first amplifier as feedback; Wherein, the second conducting terminal of described the first transistor cooperates to produce described changing voltage according to the voltage drop across described transistor seconds with the first conducting terminal of described transistor seconds.

Alternatively, described change-over circuit comprises the second amplifier further, described second amplifier has the first input being configured to receive described error reference signal, be configured to the second input receiving described difference voltage, and be configured to the output producing described skip mode reference signal according to the difference between described difference voltage and described error reference signal.

Alternatively, described electronic equipment comprises further: voltage divider, is configured to the first input described error reference signal being coupled to described second amplifier; Input resistor, is configured to the second input described difference voltage being coupled to described second amplifier; And feedback resistor, between the output being coupling in described second amplifier and described input resistor; And wherein, the resistance of described input resistor and the resistors match of described feedback resistor.

Alternatively, described first current feedback circuit comprises: the first current feedback circuit resistor; First current mirror, has input and output; First current feedback circuit input transistors, has the control terminal being coupled to described input voltage, is coupled to the first conducting terminal of described first current feedback circuit resistor, and is coupled to second conducting terminal of input of described first current mirror; The electric current that the output of described first current mirror is configured to according to flowing through described first current feedback circuit input transistors produces the first image current.

Alternatively, described first current feedback circuit comprises the second current mirror further, has the input being configured to the output being coupled to described first current mirror, and is configured to the output producing described first electric current according to described first image current.

Alternatively, described second current feedback circuit comprises: the second current feedback circuit resistor; 3rd current mirror, has input and output; Second current feedback circuit input transistors, has the control terminal being coupled to described output voltage, is coupled to the first conducting terminal of described second current feedback circuit resistor, and is coupled to second conducting terminal of input of described 3rd current mirror; The electric current that the output of described 3rd current mirror is configured to according to flowing through described second current feedback circuit input transistors produces described second electric current.

Alternatively, described difference circuit comprises current comparator, described current comparator has the first input being configured to receive described first electric current, be configured to the second input receiving described second electric current, and be configured to the output producing described difference current according to the difference between described first electric current and the second electric current.

Alternatively, described electronic equipment comprises the one in mobile phone, panel computer and integrated antenna package.

According to another aspect of the present disclosure, a kind of electronic equipment is provided, comprise: switching converter, comprise: error amplifier, there is the first input being configured to receive the feedback signal obtained from the second voltage, be configured to the second input receiving error reference signal, and be configured to the output producing error signal; First comparator, has the first input being configured to receive described error signal, is configured to the second input receiving skip mode reference signal, and is configured to the output producing pulse skipping mode control signal; Second comparator, has the first input being configured to receive described error signal, is configured to the second input receiving width modulated mode reference signal, and is configured to the output producing pulse width modulation control signal; Control logic, is configured to be coupled to described pulse skipping mode control signal and described pulse width modulation control signal; And output transistor, be configured to be coupled to described control logic and the first voltage, and be configured to export described second voltage based on described control logic; And with reference to generator, be configured to produce described skip mode reference signal according to the difference between described second voltage and described first voltage.

Alternatively, described reference generator is configured to produce described skip mode reference signal according to the square root of the difference between described second voltage and described first voltage.

Alternatively, described reference generator comprises: the first current feedback circuit, is configured to produce the first electric current according to described second voltage; Second current feedback circuit, is configured to produce the second electric current according to described first voltage; Difference circuit, is configured to produce difference current according to the difference between described first electric current and described second electric current; And change-over circuit, be configured to described difference current to be converted to described skip mode reference signal.

Alternatively, described change-over circuit comprises: the pairing of transistor, is configured to produce changing voltage in response to described difference current; And first amplifier, there is the first input being configured to receive described changing voltage, be configured to the second input receiving error reference signal, and be configured to the output producing difference voltage according to the difference between described changing voltage and described error reference signal.

Alternatively, the pairing of described transistor comprises: the first transistor, has the first conducting terminal being coupled to described difference current, is coupled to the control terminal of described difference current, and the second conducting terminal; And transistor seconds, there is the first conducting terminal of the second conducting terminal being coupled to described the first transistor, be coupled to the control terminal of described difference current, and be coupled to the second conducting terminal of the output of described first amplifier as feedback; Wherein, the second conducting terminal of described the first transistor cooperates to produce described changing voltage according to the voltage drop across described second diode coupled transistor with the first conducting terminal of described transistor seconds.

Alternatively, described change-over circuit comprises the second amplifier further, described second amplifier has the first input being configured to receive described error reference signal, be configured to the second input receiving described difference voltage, and be configured to the output producing described skip mode reference signal according to the difference between described difference voltage and error reference signal.

Alternatively, described electronic equipment comprises further: voltage divider, is configured to the first input described error reference signal being coupled to described second amplifier, input resistor, is configured to the second input described difference voltage being coupled to described second amplifier; And feedback resistor, between the output being coupling in described input resistor and described second amplifier; And wherein, the resistance of described input resistor and the resistors match of described feedback resistor.

Alternatively, described electronic equipment comprises the one in mobile phone, panel computer and integrated antenna package.

Accompanying drawing explanation

Fig. 1 is the schematic diagram according to electronic equipment of the present disclosure.

Fig. 2 is the schematic diagram of the reference generator of the electronic equipment of Fig. 1.

Embodiment

One or more embodiment of the present disclosure below will be described.Embodiment described in these is only the example of current public technology.In addition, providing in the succinct effort described, all features of true execution mode can not be described in the description.What should know is in the development of any this true execution mode, as in any engineering design or design object, the specific purposes that a large amount of execution mode specifically judges to realize developer can be made, the consistency of such as or business-related constraints relevant to the system that can change from an execution mode to another.In addition, should know that to be this development efforts can be is complicated and consuming time, but still will be design, manufacture and the routine of processing enterprise for those skilled in the art in benefit of this disclosure.

When introducing the element of each embodiment of the present disclosure, article " ", " one " and " being somebody's turn to do " are intended to mean to there is one or more element.Term " comprises ", " comprising " and " having " be intended to comprising property, and means can there is extra element except listed element.In addition, it should be understood that reference for the disclosure " embodiment " or " embodiment " and not intended to be is interpreted as eliminating the existence of the Additional examples of composition also comprising described feature.

Originally with reference to Fig. 1, now electronic equipment 100 is described.Electronic equipment 100 can be the equipment of cell phone, panel computer or any other portable, battery powered.In addition, electronic equipment 100 also can be integrated circuit.Electronic equipment 100 comprises switching converter 110, is configured to, under pulse-width-modulated mode or pulse skipping mode, input voltage vin is converted to output voltage Vout.The active operation that pulse-width-modulated mode is used for electronic equipment 100 (is such as in cellular situation at electronic equipment, aggressive mode can comprise dials audio call, view Internet, or play multimedia document), and pulse skipping mode is used for the passive operation of electronic equipment (herein, be in cellular situation at electronic equipment, Passive Mode can comprise the idle condition closing display).

Switching converter 110 can comprise error amplifier 112, and it receives the feedback signal Vfb that obtains from output voltage and error reference signal Vref using as input, and exports at it and produce error signal Verr.First comparator 116 receives error signal Verr and skip mode reference signal Vskip_mode in its input, and exports generation pulse skipping mode control signal PSM at it.Skip mode reference signal Vskip_mode produces according to the function of the difference between output voltage Vout and input voltage vin by with reference to generator 200.As described in detail below, this function can be the square root of the difference between output voltage Vout and input voltage vin.

Second comparator 118 receives error signal Verr and pulse-width-modulated mode signal Vpwm (it can be sawtooth waveform) in its input, and exports generation pulse width control signal PWM at it.Control logic 120 is coupled to the output of the first comparator 116 and the second comparator 118, and carrys out the clock signal of self-oscillator 122.Control logic 120 is coupled to the gate terminal of PMOS transistor 126 and nmos pass transistor 124, and operates these transistors to load 132 transmission of electric energy under pulse skipping mode or pulse-width-modulated mode.Depend on the output of control logic 120, electric current will flow through inductor 128 from Vin, and flow through PMOS transistor 126 (during the part during the transmission of electric energy in cycle) or nmos pass transistor 124 (during the part during the not transmission of electric energy in cycle).When nmos pass transistor 124 conducting (therefore during a part for the not transmission of electric energy in cycle), store the electric current flowing through inductor 128.If the output of control logic 120 makes electric current flow through PMOS transistor 126, then electric current flows through the load 132 with capacitor 130 parallel coupled subsequently.In addition, if electric current is stored in inductor 128, when PMOS transistor 126 conducting, (therefore during a part for the transmission of electric energy in cycle) electric current flows to load thus.If the output of control logic 120 makes electric current flow through nmos pass transistor 124, then electric current flows to ground connection subsequently.

Under pulse skipping mode, the electric current flowing through inductor 128 mathematically can be expressed as:

$\mathrm{Ipeak}=\frac{\mathrm{Vin}}{L}*d*T---\left(1\right)$

Wherein, d is the duty ratio of equipment, and T is switching cycle.As skilled in the art to understand, at d ₂during the T cycle, current delivery is to load 132.D ₂can mathematically be expressed as:

$d_2=\frac{\mathrm{Vin}}{\mathrm{Vout}-\mathrm{Vin}}*d---\left(2\right)$

Therefore load current can mathematically be expressed as:

$I_o*T=\frac{I_{\mathrm{peak}}}{2}*d_2*T---\left(3\right)$

Therefore, equation can be reduced to:

$I_o=\frac{I_{\mathrm{peak}}}{2}*d_2=\frac{I_{\mathrm{peak}}}{2}*\frac{\mathrm{Vin}}{\mathrm{Vout}-\mathrm{Vin}}*d=\frac{\mathrm{Vin}}{2*L}*d*t*\frac{\mathrm{Vin}}{\mathrm{Vout}-\mathrm{Vin}}*d---\left(4\right)$

Therefore, the load current of simplification can mathematically be expressed as:

$\mathrm{Io}=\frac{{\mathrm{Vin}}^2}{2*L(\mathrm{Vout}-\mathrm{Vin})}*d^{2}T---\left(5\right)$

By using load modeling as equivalent sense resistor, the voltage be proportional to across the electric current of inductor 128 can mathematically be expressed as:

$\mathrm{Vc}=\mathrm{Ipeak}*\mathrm{Rsens}=\frac{\mathrm{Vin}}{L}*d*T*\mathrm{Rsens}---\left(6\right)$

Equation is separated for d obtain:

$d=\frac{\mathrm{Vc}}{\mathrm{Vin}*\mathrm{Rsens}*T}*L---\left(7\right)$

This numerical value of d is inserted in equation lo is obtained:

$\mathrm{Io}=\frac{{\mathrm{Vc}}^2}{2*(\mathrm{Vout}-\mathrm{Vin})*R{\mathrm{sens}}^2*T}*L---\left(8\right)$

This can be rewritten as:

$\mathrm{Io}=\frac{{\mathrm{Vc}}^2}{(\mathrm{Vout}-\mathrm{Vin})}*K---\left(9\right)$

Wherein, K is

$K=\frac{L}{2*{\mathrm{Rsens}}^2*T}---\left(10\right)$

Describe in detail with reference to generator 200 now with reference to Fig. 2.Comprise with reference to generator 200 the first current feedback circuit 210 producing the first electric current I 1 according to input voltage vin, and produce the second current feedback circuit 220 of the second electric current I 2 according to output voltage Vout.Difference circuit 230 produces difference current Id according to difference between the first and second electric currents.Difference current Id is converted to skip mode reference signal Vskip_mode by change-over circuit 240.

Present by detailed description first current feedback circuit 210.First current feedback circuit 210 comprises the first current feedback circuit input transistors 250, has the control terminal being coupled to input voltage vin t, and has the conducting terminal of the input being coupled to the first current feedback circuit resistor R1g and the first current mirror 212.Electric current I 1 mirror image flowing through the first current feedback circuit input transistors 250 exports to it by the first current mirror 212, and this output is coupled to the input of the second current mirror 214.Second current mirror is the first electric current being applied to difference circuit 230 by going to its electric current I 1 mirror image exported.

Present by detailed description second current feedback circuit 220.Second current feedback circuit 220 comprises the second current feedback circuit input transistors 252, there is the control terminal being coupled to output voltage Vout, and there is the conducting terminal of the input being coupled to the second current feedback circuit resistor R2g (it has the resistance value identical with the first current feedback circuit resistor R1g in illustrated embodiment) and the 3rd current mirror 254.Electric current I 2 mirror image flowing through the second current feedback circuit input transistors 252 exports to it, as the second electric current going to difference circuit 230 by the 3rd current mirror.

Difference circuit 230 is current comparators, receives the first electric current I 1 and the second electric current I 2 as input, and exports at it and produce difference current Id.Difference current Id equals the difference between the first electric current I 1 and the second electric current I 2, and can mathematically be expressed as:

$\mathrm{Id}=\frac{\mathrm{Vout}-\mathrm{Vin}}{R1g}$

Although it should be noted that R1g is for above equation, when resistor has same resistance value in the embodiment shown, can substitute and use R2g.

To describe change-over circuit 240 in detail now.Change-over circuit 240 comprises the pairing of transistor 242a, 242b, be configured to produce changing voltage Vconv, and following by arranging of describing in detail.Changing voltage Vconv is received by the input of the first amplifier 244, and second of the first amplifier the input have received error reference signal Vref.First amplifier 244 produces difference voltage Vd in its output according to the difference between changing voltage Vconv and error reference signal Vref.

The first transistor 242a has the first conducting terminal being coupled to difference current Id, is coupled to the second conducting terminal of first conducting terminal of transistor seconds 242b, and is also coupled to the control terminal of difference current Id.Transistor seconds 242b also has the second conducting terminal being coupled to the output of the first amplifier 244 as feedback, and is coupled to the control terminal of difference current Id.The voltage drop be used for according to across transistor seconds that is coupled between the first transistor 242a and the conducting terminal of transistor seconds 242b produces changing voltage Vconv.

Pairing and first amplifier 244 of transistor 242a, 242b together form square root circuit.Therefore the difference voltage Vd that first amplifier 244 exports can mathematically be expressed as:

$\mathrm{Vd}=\mathrm{Vref}-K1*\sqrt{\mathrm{Vout}-\mathrm{Vin}}$

Wherein $K1=\frac{S9}{\sqrt{\mathrm{\μn}*\mathrm{Cox}\left(\frac{W}{L}\right)*R1g}}$

Error reference signal Vref is coupled to the input of the second amplifier 248 by the voltage divider that resistor Rdiv1 and Rdiv2 (having equal resistance value in the embodiment shown) is formed.Difference voltage is coupled to the input of the second amplifier 248 by input resistor Rin, and feedback resistor Rfb (having the resistance value identical with input resistor in the embodiment shown) is coupling between the output of input resistor and the second amplifier.Second amplifier 248 receives described error reference signal Vref and difference voltage Vd, and produces skip mode reference signal Vskip_mode according to the difference between difference voltage and error reference signal.Therefore, the second amplifier 248 is used as subtracter, and deducts error reference signal Vref from difference voltage Vd.The operation of subtracter can mathematically be expressed as:

$\mathrm{Vd}-\mathrm{Vref}=K1*\sqrt{\mathrm{Vout}-\mathrm{Vin}}$

Therefore skip mode reference signal Vskip_mode can mathematically be expressed as:

$\mathrm{Vskip}\_\mathrm{mode}=K1*\sqrt{\mathrm{Vout}-\mathrm{Vin}}$

As mentioned above, said circuit can contribute to vernier control and switch to PSM pattern from PWM mode, and therefore contributes to reducing power consumption.Those skilled in the art are that the disclosure designs and covers the correlation technique of circuit operation by what know.

Although describe the disclosure with reference to finite population embodiment, the those skilled in the art being subject to disclosure instruction will know and can envision other embodiments and not depart from as said the scope of the present disclosure.Therefore, only the scope of the present disclosure is defined by the following claims.

Claims (20)

1. an electronic equipment, is characterized in that, comprising:

Switching converter, is configured to input voltage to be converted to output voltage, and under operating in pulse skipping mode based on control signal alternative;

Described switching converter comprises comparator, and described comparator has the first input being configured to receive error signal, is configured to the second input receiving skip mode reference signal, and is configured to the output producing described control signal; And

With reference to generator, be configured to produce described skip mode reference signal according to the difference between described output voltage and described input voltage.

2. electronic equipment according to claim 1, it is characterized in that, described switching converter comprises error amplifier further, described error amplifier has the first input being configured to receive the feedback signal obtained from described output voltage, be configured to the second input receiving error reference signal, and be configured to the output producing described error signal.

3. electronic equipment according to claim 1, is characterized in that, described reference generator comprises:

First current feedback circuit, is configured to produce the first electric current according to described input voltage;

Second current feedback circuit, is configured to produce the second electric current according to described output voltage;

Difference circuit, is configured to produce difference current according to the difference between described first electric current and described second electric current; And

Change-over circuit, is configured to described difference current to be converted to described skip mode reference signal.

4. electronic equipment according to claim 3, is characterized in that, described change-over circuit comprises:

The pairing of transistor, is configured to export changing voltage; And

First amplifier, has the first input being configured to receive described changing voltage, is configured to the second input receiving error reference signal, and is configured to the output producing difference voltage according to the difference between described changing voltage and described error reference signal.

5. electronic equipment according to claim 4, is characterized in that, the pairing of described transistor comprises:

The first transistor, has the first conducting terminal being coupled to described difference current, is coupled to the control terminal of described difference current, and the second conducting terminal; And

Transistor seconds, has the first conducting terminal of the second conducting terminal being coupled to described the first transistor, is coupled to the control terminal of described difference current, and is configured to the second conducting terminal being coupled to the output of described first amplifier as feedback;

Wherein, the second conducting terminal of described the first transistor cooperates to produce described changing voltage according to the voltage drop across described transistor seconds with the first conducting terminal of described transistor seconds.

6. electronic equipment according to claim 4, it is characterized in that, described change-over circuit comprises the second amplifier further, described second amplifier has the first input being configured to receive described error reference signal, be configured to the second input receiving described difference voltage, and be configured to the output producing described skip mode reference signal according to the difference between described difference voltage and described error reference signal.

7. electronic equipment according to claim 6, is characterized in that, described electronic equipment comprises further:

Voltage divider, is configured to the first input described error reference signal being coupled to described second amplifier;

Input resistor, is configured to the second input described difference voltage being coupled to described second amplifier; And

Feedback resistor, between the output being coupling in described second amplifier and described input resistor; And

Wherein, the resistance of described input resistor and the resistors match of described feedback resistor.

8. electronic equipment according to claim 3, is characterized in that, described first current feedback circuit comprises:

First current feedback circuit resistor;

First current mirror, has input and output;

First current feedback circuit input transistors, has the control terminal being coupled to described input voltage, is coupled to the first conducting terminal of described first current feedback circuit resistor, and is coupled to second conducting terminal of input of described first current mirror;

The electric current that the output of described first current mirror is configured to according to flowing through described first current feedback circuit input transistors produces the first image current.

9. electronic equipment according to claim 8, it is characterized in that, described first current feedback circuit comprises the second current mirror further, has the input being configured to the output being coupled to described first current mirror, and is configured to the output producing described first electric current according to described first image current.

10. electronic equipment according to claim 9, is characterized in that, described second current feedback circuit comprises:

Second current feedback circuit resistor;

3rd current mirror, has input and output;

Second current feedback circuit input transistors, has the control terminal being coupled to described output voltage, is coupled to the first conducting terminal of described second current feedback circuit resistor, and is coupled to second conducting terminal of input of described 3rd current mirror;

The electric current that the output of described 3rd current mirror is configured to according to flowing through described second current feedback circuit input transistors produces described second electric current.

11. electronic equipments according to claim 10, it is characterized in that, described difference circuit comprises current comparator, described current comparator has the first input being configured to receive described first electric current, be configured to the second input receiving described second electric current, and be configured to the output producing described difference current according to the difference between described first electric current and the second electric current.

12. electronic equipments according to claim 1, is characterized in that, described electronic equipment comprises the one in mobile phone, panel computer and integrated antenna package.

13. 1 kinds of electronic equipments, is characterized in that, comprising:

Switching converter, comprising:

Error amplifier, has the first input being configured to receive the feedback signal obtained from the second voltage, is configured to the second input receiving error reference signal, and is configured to the output producing error signal;

First comparator, has the first input being configured to receive described error signal, is configured to the second input receiving skip mode reference signal, and is configured to the output producing pulse skipping mode control signal;

Second comparator, has the first input being configured to receive described error signal, is configured to the second input receiving width modulated mode reference signal, and is configured to the output producing pulse width modulation control signal;

Control logic, is configured to be coupled to described pulse skipping mode control signal and described pulse width modulation control signal; And

Output transistor, is configured to be coupled to described control logic and the first voltage, and is configured to export described second voltage based on described control logic; And

With reference to generator, be configured to produce described skip mode reference signal according to the difference between described second voltage and described first voltage.

14. electronic equipments according to claim 13, is characterized in that, described reference generator is configured to produce described skip mode reference signal according to the square root of the difference between described second voltage and described first voltage.

15. electronic equipments according to claim 13, is characterized in that, described reference generator comprises:

First current feedback circuit, is configured to produce the first electric current according to described second voltage;

Second current feedback circuit, is configured to produce the second electric current according to described first voltage;

Difference circuit, is configured to produce difference current according to the difference between described first electric current and described second electric current; And

Change-over circuit, is configured to described difference current to be converted to described skip mode reference signal.

16. electronic equipments according to claim 15, is characterized in that, described change-over circuit comprises:

The pairing of transistor, is configured to produce changing voltage in response to described difference current; And

First amplifier, has the first input being configured to receive described changing voltage, is configured to the second input receiving error reference signal, and is configured to the output producing difference voltage according to the difference between described changing voltage and described error reference signal.

17. electronic equipments according to claim 16, is characterized in that, the pairing of described transistor comprises:

The first transistor, has the first conducting terminal being coupled to described difference current, is coupled to the control terminal of described difference current, and the second conducting terminal; And

Transistor seconds, has the first conducting terminal of the second conducting terminal being coupled to described the first transistor, is coupled to the control terminal of described difference current, and is coupled to the second conducting terminal of the output of described first amplifier as feedback;

Wherein, the second conducting terminal of described the first transistor cooperates to produce described changing voltage according to the voltage drop across described transistor seconds with the first conducting terminal of described transistor seconds.

18. electronic equipments according to claim 16, it is characterized in that, described change-over circuit comprises the second amplifier further, described second amplifier has the first input being configured to receive described error reference signal, be configured to the second input receiving described difference voltage, and be configured to the output producing described skip mode reference signal according to the difference between described difference voltage and error reference signal.

19. electronic equipments according to claim 18, is characterized in that, described electronic equipment comprises further:

Voltage divider, is configured to the first input described error reference signal being coupled to described second amplifier,

Input resistor, is configured to the second input described difference voltage being coupled to described second amplifier; And

Feedback resistor, between the output being coupling in described input resistor and described second amplifier;

And wherein, the resistance of described input resistor and the resistors match of described feedback resistor.

20. electronic equipments according to claim 13, is characterized in that, described electronic equipment comprises the one in mobile phone, panel computer and integrated antenna package.