CN207783219U

CN207783219U - Control circuit, chip and switching device

Info

Publication number: CN207783219U
Application number: CN201820155752.9U
Authority: CN
Inventors: 郁炜嘉; 孙顺根; 郜小茹
Original assignee: Shanghai Semiconducto Ltd By Share Ltd
Current assignee: Shanghai Semiconducto Ltd By Share Ltd
Priority date: 2018-01-30
Filing date: 2018-01-30
Publication date: 2018-08-28
Anticipated expiration: 2028-01-30

Abstract

A kind of control circuit of the application offer, chip and switching device.Wherein, the control circuit provides driving electric signal based on the switch control signal received to the grid of the PMOS tube；Wherein, the PMOS tube is being controlled from the off-state guide logical state transition period, the pressure difference between the driving electric signal and the source electrode and grid of the PMOS tube is in inverse change relationship.The problems such as present application addresses PMOS tube response speed is slow in the prior art.

Description

Control circuit, chip and switching device

Technical field

This application involves electronic circuit technology fields, more particularly to a kind of control circuit, chip method and switching device.

Background technology

Switching circuit is used in electronic product extensively, has many advantages, such as that response is fast, integrated level is high.For example, in LED In drive system, switching circuit controls resonance circuit and provides power supply to LED load.Actual demand with people to electronic product Increase, the switching frequency variation range of switching circuit gradually increasing.This is to hardware electrical part itself in switching circuit and electricity More stringent requirements are proposed for the responding ability of line structure.

Wherein, according to the design needs of switching circuit, PMOS tube is often used as switching device.In the control of practical PMOS tube In circuit design, due to the characteristic of semiconductor of PMOS tube, from off-state to the conducting state transition period, source grid pressure difference meeting Ramp type variation as shown in Figure 1 is undergone, this variation causes PMOS tube to have certain time-delay when responding conductivity control signal. When the switching high frequency of conducting state and off-state occurs, which significantly limits the response frequency of PMOS tube.

Invention content

In view of the foregoing deficiencies of prior art, the application is designed to provide a kind of control circuit, chip method And switching device, for solving the problems such as PMOS tube response speed is slow in the prior art.

In order to achieve the above objects and other related objects, the first aspect of the application provides a kind of control electricity of PMOS tube Road provides driving electric signal based on the switch control signal received to the grid of the PMOS tube；Wherein, described in control PMOS tube leads to the state transition period from off-state guide, between driving electric signal and the source electrode and grid of the PMOS tube Pressure difference be in inverse change relationship.

In the certain embodiments of the first aspect of the application, the control circuit includes：Sampling unit, described in sampling Pressure difference between the source electrode and grid of PMOS tube and the output in the form of feedback signal；Control unit, with the sampling unit and institute The grid for stating PMOS tube is connected, for the grid based on the switch control signal and the feedback signal received to the PMOS tube Pole provides driving electric signal；Wherein, the PMOS tube is being controlled from off-state guide logical state transition period, the driving electricity Signal is in inverse change relationship with feedback signal.

In the certain embodiments of the first aspect of the application, the sampling unit includes：With the grid of the PMOS tube Extremely connected sampling resistor；First current mirror, input terminal connect the sampling resistor, and output end connects a feedback resistance, is used for Sampling electric signal from the sampling resistor is transferred to the feedback resistance, to form feedback signal.

In the certain embodiments of the first aspect of the application, described control unit includes：First control circuit module, It is connected with the grid of the PMOS tube；The first control circuit module when receiving the switch control signal of corresponding conducting, Variation adjustment based on the feedback signal received is exported to the driving electric signal of the PMOS tube grid.

In the certain embodiments of the first aspect of the application, the first control circuit module includes：Current source Module is connected with the sampling unit, for exporting the controlled electrical signal changed according to the feedback signal；First switch circuit Submodule receives switch control signal and is connected with the current source submodule, for being led with the switch control signal received On-off is opened；Driving circuit submodule is connected with the first switch circuit submodule, the controlled electrical signal for will be received It is converted into driving electric signal and exports.

In the certain embodiments of the first aspect of the application, the current source submodule includes controlled current source.

In the certain embodiments of the first aspect of the application, described control unit includes：Second control circuit module, The PMOS tube is connected, when receiving the switch control signal of corresponding disconnection, between the source electrode and grid that adjust the PMOS Pressure difference so that the PMOS tube is transferred to off-state.

In the certain embodiments of the first aspect of the application, the second control circuit module includes：Pull-up circuit Submodule is connected between the grid and source electrode of the PMOS tube.

In the certain embodiments of the first aspect of the application, the second control circuit module further includes：By described The second switch circuit submodule of switch control signal control, is connected with the pull-up circuit submodule, corresponding disconnected when receiving It is connected when the switch control signal opened to control the voltage that the pull-up circuit submodule raises the driving end, and when reception It is disconnected when to the corresponding switch control signal be connected.

In the certain embodiments of the first aspect of the application, control circuit further includes：Non-overlapping control signal generates Unit, for based on the non-overlapping switch control signal of switch control signal output two-way received, wherein exported the One switch control signal is transferred to off-state for controlling the PMOS tube, and the second switch control signal exported is for controlling The PMOS tube is transferred to conducting state.

The application second aspect provides a kind of switching device, including at least one switching circuit；The switching circuit includes： As above any control circuit and PMOS tube；Wherein, the grid of the PMOS tube connects the control circuit；The control Circuit provides driving electric signal based on the switch control signal received to the grid of the PMOS tube, and the PMOS tube is based on institute Driving electric signal is stated to convert between conducting state and off-state；Wherein, the PMOS tube is being controlled from off-state guide Logical state transition period, the pressure difference between the driving electric signal and the source electrode and grid of the PMOS tube are closed in inverse change System.

In the certain embodiments of the second aspect of the application, the switching circuit also includes second control circuit；Its In, control circuit and PMOS tube in the switching circuit switch to off-state for controlling the second PMOS tube by conducting state, The second control circuit switchs to conducting state for controlling second PMOS tube by off-state.

In the certain embodiments of the second aspect of the application, the quantity of the switching circuit is multiple, and each described Control circuit individually controls connected PMOS tube in switching circuit.

The application third aspect provides a kind of chip, including：As above any control circuit.

In the certain embodiments of the third aspect of the application, the chip further includes being connected with the control circuit PMOS tube a, wherein switching circuit is at least formed by the control circuit and PMOS tube.

In the certain embodiments of the third aspect of the application, the switching circuit also includes second control circuit；Its In, control circuit and PMOS tube in the switching circuit switch to off-state for controlling the second PMOS tube by conducting state, The second control circuit switchs to conducting state for controlling second PMOS tube by off-state.

In the certain embodiments of the third aspect of the application, the quantity of the switching circuit is multiple, and each described Control circuit individually controls connected PMOS tube in switching circuit.

As described above, the control circuit of the application, chip method and switching device, have the advantages that：The application The control circuit provided is due to during PMOS tube switchs to conducting state from off-state, providing one and PMOS source grid electricity The driving electric signal of pressure difference inverse change so that grid voltage declines more quickly, effectively increases the response of PMOS tube conducting Speed.In addition, when being gradually transferred to conducting state from off-state with PMOS tube, source grid pressure difference gradually increases so that control The driving electric signal that circuit is provided from large to small, also achieves the target of control circuit in-fighting minimum during conducting.

On the other hand, the pull-up circuit submodule in control circuit provided herein is pulled up as a result of active The mode of gate pmos pole tension so that the parasitic capacitance energy of PMOS tube source grid during switching to off-state from conducting state Enough repid discharges, which thereby enhance the response speed of PMOS tube disconnection.

Description of the drawings

Fig. 1 is shown as the gate-source voltage change schematic diagram of switching pmos conducting state and off-state transition period.

Fig. 2 is shown as the electrical block diagram of known PMOS tube and control circuit.

Fig. 3 is shown as the control circuit of the application and the connection diagram of PMOS tube.

Fig. 4 is shown as the structure diagram of the control circuit of the application.

Fig. 5 is shown as the structural schematic diagram of the control circuit of the application in some embodiments.

Fig. 6 is shown as the structural schematic diagram of the control circuit of the application in yet other embodiments.

Fig. 7 is shown as the electrical block diagram of the control circuit of the application in other embodiments.

Fig. 8 is shown as the encapsulation schematic diagram of the chip of the application.

Fig. 9 is shown as the electrical block diagram of the switching circuit in the chip of the application in one embodiment.

Figure 10 is shown as the electrical block diagram of the multiple switch circuit of the application in one embodiment.

Figure 11 is shown as electrical block diagram of the multiple switch circuit of the application in another embodiment.

Figure 12 is shown as the electrical block diagram of the multiple switch circuit of the application in another embodiment.

Figure 13 is shown as the flow chart of the control method of the application in one embodiment.

Specific implementation mode

Illustrate that presently filed embodiment, those skilled in the art can be by this explanations by particular specific embodiment below Content disclosed by book understands other advantages and effect of the application easily.

In described below, refer to the attached drawing, attached drawing describes several embodiments of the application.It should be appreciated that also can be used Other embodiment, and can be carried out without departing substantially from spirit and scope of the present disclosure mechanical composition, structure, electrically with And operational change.Following detailed description should not be considered limiting, and the range of embodiments herein The limited of claims terms used herein of patent only by announcing are merely to describe specific embodiment, and be not It is intended to limitation the application.

Although term first, second etc. are used for describing various elements herein in some instances, these elements It should not be limited by these terms.These terms are only used for distinguishing an element with another element.For example, first is pre- If threshold value can be referred to as the second predetermined threshold value, and similarly, the second predetermined threshold value can be referred to as the first predetermined threshold value, and The range of various described embodiments is not departed from.First predetermined threshold value and predetermined threshold value are to describe a threshold value, still Unless context otherwise explicitly points out, otherwise they are not the same predetermined threshold values.Similar situation further includes first Volume and the second volume.

Furthermore as used in herein, singulative " one ", "one" and "the" are intended to also include plural number shape Formula, unless having opposite instruction in context it will be further understood that term "comprising", " comprising " show that there are the spies Sign, step, operation, element, component, project, type, and/or group, but it is not excluded for other one or more features, step, behaviour Presence, appearance or the addition term "or" used herein and "and/or" quilt of work, element, component, project, type, and/or group Be construed to inclusive, or mean any one or any combinations therefore, " A, B or C " or " A, B and/or C " mean " with Descend any one：A；B；C；A and B；A and C；B and C；A, B and C ".Only when element, function, step or the combination of operation are in certain sides When inherently mutually exclusive under formula, it just will appear the exception of this definition.

Switching device (being called switching circuit) is in LED illumination, industrial control equipment, communication apparatus, Medical Devices, household appliance etc. Extensive use.For example, in LED drive system, switching device configures in drive system, for the resonance in drive system Device carries out excitatory demagnetization control, to realize the purpose of driving LED load work.For another example, in frequency conversion system, switching device by Pwm signal control voltage controlled oscillator powers to the load, wherein and pwm signal is adjusted duty ratio by feedback information, so, switch dress The switching frequency set changes therewith so realizes frequency conversion purpose.As people are to the diversified demand of load and right The response frequency of the improvement of circuit system performance, switching device is constantly increasing.For example, for the LED illumination System of tunable optical For, a kind of mode lightening LED load is the switching frequency of raising switching device, however, some are known by PMOS tube As the switching device of switch, as shown in Fig. 2, (indicating the switch control letter of conducting PMOS tube M1 when EN terminations receive high level Number) when, triode Q1 and Q3 are connected and Q2 is disconnected so that the source grid pressure difference of M1 increases, M1 conductings；When EN terminations receive low electricity When flat (indicating to disconnect the switch control signal of PMOS tube M1), triode Q1 and Q3 are disconnected and Q2 is connected so that the source grid of M1 Pressure difference reduces, and M1 is disconnected.In the examples described above, it since M1 is semiconductor devices, is cut between conducting state and off-state When changing, slope processes as shown in Figure 1 can be passed through, when the frequency of switch control signal is got higher, switching device shown in Fig. 2 must So responding ability of limit switch device by the inherent characteristic of semiconductor devices.Moreover, switching device shown in Fig. 2, To prevent M1 breakdown during M1 is connected, setting backward dioded D1 and resistance R2 is also needed, this makes switching device be connected There is current drain on period resistance R2, this also increases the in-fightings of switching device.

The circuit system for including switching device to other is spreaded to above-mentioned example, in order to improve using PMOS tube as switching device Switching device performance, the application provides a kind of control circuit of PMOS tube.Referring to Fig. 3, it is shown as the control of the application The structural schematic diagram of circuit processed and PMOS tube access load supplying circuit.The source electrode of PMOS tube accesses the supply line, grid As driving end connection control circuit, drain electrode and it is used to that the late-class circuit of loaded work piece to be driven to be connected.The late-class circuit includes But be not limited to resonance device or oscillator above-mentioned etc..By taking LED drive system as an example, part is not shown in the control circuit front end Including prime fairing, exported to AC power (such as alternating current) rectification and by the supply line, voltage VCC tables Show；The supply line is also connected with LED load (not shown) and the drain electrode connection resonance device of the PMOS tube (does not show Go out), wherein the LED load is connected with resonance device conducts circuit to constitute.

The control circuit provides driving electric signal based on the switch control signal received to the grid of the PMOS tube； Wherein, the PMOS tube is being controlled from off-state guide logical state transition period, the driving electric signal and the PMOS tube Source electrode and grid between pressure difference be in inverse change relationship.

Wherein, the switch control signal can be the pwm signal or other square-wave signals that Preceding stage control device provides. This, the Preceding stage control device can be the device for having digital operation and logic processing capability, may include CPU, MCU or its His programmable logic device etc., but it is not limited to this.For example, the Preceding stage control device is the control panel of LED load, according to The instruction of user's operation controls signal to control circuit output respective switch.For another example, the Preceding stage control device is feedback Control circuit controls signal according to through the obtained information of feedback processing to control circuit output respective switch.According to institute Conducting represented by the switch control signal of the Preceding stage control device of connection and open command, the control circuit include to match Control unit.For example, when switch control signal is that high level indicates turn-on command, the control circuit need to reduce PMOS tube Grid voltage make PMOS tube source grid voltage difference be more than or equal to semiconductor devices conducting voltage threshold, to realize PMOS Pipe is connected；When switch control signal is that low level indicates open command, the control circuit need to be increased to the grid of PMOS tube Voltage makes the source grid voltage difference of PMOS tube be less than the voltage threshold, to realize that PMOS tube disconnects.It should be understood that according to design It needs, the control circuit can also be based on low level switch control signal and execute conducting PMOS tube, and based on high level Switch control signal, which executes, disconnects PMOS tube.Wherein, when control circuit reduces grid voltage, pass through what is changed to grid output Drive the mode of electric signal that voltage threshold or less is down in grid voltage acceleration.

By taking circuit structure shown in Fig. 3 as an example, using the electrical connection with PMOS source grid, the control circuit can The source grid pressure difference for obtaining PMOS tube, when receiving the switch control signal for indicating conducting, the control circuit utilizes voltage Technology and image current technology is followed to be converted into the pressure difference to change opposite driving electric signal therewith so that the source of PMOS tube Grid pressure difference while gradually increase the electric current of the driving electric signal gradually decrease, thus shorten between gate pmos source electrode Pressure difference reach conduction threshold duration.

Referring to Fig. 4, it is shown as the structural schematic diagram of the control circuit of the application in one embodiment.The control Circuit includes：Sampling unit and control unit.Wherein, the sampling unit samples between the source electrode and grid of the PMOS tube Pressure difference is simultaneously exported in the form of feedback signal.The grid of described control unit and sampling unit and PMOS tube is all connected with, and with The connected connecting pin (such as ends EN) of Preceding stage control device is to receive switch control signal.Described control unit is opened based on what is received It closes control signal and the feedback signal and provides driving electric signal to the grid of the PMOS tube.

Wherein, the sampling unit includes the sampling resistor being arranged between the grid of PMOS tube source, the feedback signal by Described sampling resistor one end voltage indicates.By taking the PMOS tube shown in Fig. 4 based on gate driving as an example, by adjusting grid electricity It presses to adjust pressure difference between the grid of PMOS tube source, therefore, the side voltmeter that the feedback signal is connected by sampling resistor with grid Show.In some embodiments, the sampling resistor is connected to source grid both ends by a current mirror, and is inputted using current mirror There is the relationship of current mirror the sampled signal sampled is converted into feedback signal for side and outlet side.

Referring to Fig. 5, it is shown as the electrical block diagram of the control circuit in one embodiment.The sampling Unit 11 includes sampling resistor R1, the first current mirror (M1, M2) and feedback resistance R2, wherein two of first current mirror The source electrode of transistor (M1, M2) and the source electrode of PMOS tube access supply line, the input terminal connection sampling of the first current mirror jointly Resistance R1, output end connection feedback resistance R2 are simultaneously grounded by resistance R2, and the output end of first current mirror is additionally operable to connect Control unit.The sampling resistor R1 acquires the pressure difference between the source grid of PMOS tube by the first current mirror, and by described First current mirror is converted into feedback signal and is supplied to control unit.Wherein, the first current mirror input terminal electric current and output end Electric current can be M:1, wherein M be less than 1, equal to 1 or more than 1 in a fixed value.Turn from off-state when PMOS tube is controlled When to during conducting state, PMOS tube source grid pressure difference becomes larger as shown in Figure 1, and the pressure difference at sampling resistor both ends is also to strain Greatly, the mirror image through the first current mirror transmits, and the first current mirror, which is exported to the electric current of feedback resistance R2, gradually to be increased, accordingly, instead The voltage at the ends feed resistance R2 becomes larger, i.e., the feedback signal exported from the feedback resistance R2 becomes larger.

In the structure of control circuit shown in Fig. 5, the PMOS tube is controlled by control unit 12.Described control unit 12 has Body controls the pressure difference before the grid of PMOS tube source by adjusting the size of current for the grid for flowing to PMOS tube, and then realizes PMOS Pipe is turned on or off.When control unit 12 receives the switch control signal of conducting, the feedback signal received is transmitted To the current branch where PMOS tube grid so that grid voltage increases and reduces based on feedback signal.In this way, PMOS tube Turn on process by feedback signal gradually it is increased influence, the driving electric signal (current signal) for being provided to grid gradually decreases, and When PMOS tube is connected, export to the electric current minimum of the driving electric signal of grid.When control unit 12 receives the switch of disconnection When controlling signal, the transmission line of the feedback signal can be disconnected so that the variation of feedback signal can not act on where grid Current branch on, in this way, the grid voltage of PMOS tube will then revert to the voltage before PMOS tube conducting, i.e. PMOS tube is transferred to disconnection State.

As shown in figure 5, described control unit 12 includes the first control circuit module 121 being connected with the grid of PMOS tube With second control circuit module 122.Wherein, the grid of the first control circuit module 121 and sampling unit 11 and PMOS tube PMOS tube is connected based on the switch control signal received in connection.The grid of the second control circuit module 122 and PMOS tube It is connected with source electrode, PMOS tube is disconnected based on switch control signal.

In some embodiments, referring to Fig. 6, it is shown as the structure of the control circuit in one embodiment shows It is intended to.Variation adjustment of the first control circuit module 22 based on the feedback signal received is exported to the PMOS tube grid Driving electric signal comprising current source submodule 221, first switch circuit submodule 222 and driving circuit submodule 223.

The current source submodule 221 is connected with the sampling unit 21, is changed according to the feedback signal for exporting Controlled electrical signal.Here, connect a constant voltage source (VDD) in the current source submodule 221, with to current source submodule Active device power supply in 221.Include controlled current source (being unillustrated) in the current source submodule 221, it is described controlled Current source is connected with the output end of sampling unit 21, the electric signal exported inverse change with the variation of the feedback signal. For example, the controlled current source is pmos type power tube, source electrode connects the constant voltage source (VDD), grid connection sampling list Output end, the drain electrode connection first switch circuit submodule 222 of member 21, when control circuit receives the switch control for indicating to be connected When signal, the voltage for the feedback signal that the sampling unit 21 exports reduces, the grid electricity of the corresponding pmos type power tube Pressure drop is low, and the electric current of the controlled electrical signal for the output that drains becomes larger, and such controlled electrical signal is in inverse change relationship with feedback signal, Subsequent conditioning circuit submodule in first control circuit module 22 can be by zooming in and out the controlled electrical signal, reversely to adjust It is whole to export to the driving electric signal of PMOS tube grid.

In some specific examples, the current source submodule includes controlled current source and voltage follower.In order to reduce Voltage follower output distortion, the voltage follower include bias current sources and power tube.Referring to Fig. 7, it is shown as controlling The electrical block diagram of circuit processed in one embodiment.The current source submodule 321 includes power tube M3, bias current Source Ibias and power tube M4, wherein power tube M3 be CMOS type power tube, power tube M4 be pmos type power tube and as by Current source is controlled, the drain electrode of power tube M3 and the source electrode of power tube M4 access constant voltage source jointly, and the grid of power tube M3 receives instead The grid of feedback signal, source electrode connection bias current sources and power tube M4, the drain electrode of power tube M4 connect first switch circuit submodule Block.When control circuit receives the switch control signal for indicating conducting, the electricity for the feedback signal that the sampling unit 31 exports Pressure drop is low, and the feedback signal received is amplified and passed to power tube M4, the grid voltage of the power tube M4 by power tube M3 It decreases, the electric current of the controlled electrical signal for the output that drains becomes larger, and such controlled electrical signal is closed with feedback signal in inverse change System.

The current source submodule is to be connected to PMOS tube by first switch circuit submodule and driving circuit submodule Grid.Wherein, first switch circuit submodule receives and switch control signal and is connected with the current source submodule, when opening When closing control signal expression conducting PMOS tube, first switch circuit submodule conducting so that the controlled electricity changed with feedback signal Signal is transferred to PMOS tube grid by driving circuit submodule；When switch control signal indicates to disconnect PMOS tube, first opens Powered-down way module disconnects, and blocks controlled electrical signal to PMOS tube gate transport.Wherein, according to the design of control circuit need and The signal identification of conducting is indicated in switch control signal, can include reverser in the first switch circuit submodule.Example Such as, when switch control signal indicates conducting with high level, the first switch circuit submodule switching tube conducting in the block.Again Such as, as shown in fig. 7, when switch control signal indicates conducting with low level, opening in the first switch circuit submodule 322 Close the high level conducting that pipe is exported based on reverser.

To coordinate the circuit structure of driving circuit submodule, two switches are may include in the first switch circuit submodule Pipe, and realize alternately break-make.As shown in fig. 7, the first switch circuit submodule 322 includes CMOS type switching tube M6, PMOS Type switching tube M5 and reverser.When switch control signal indicates conducting with low level, CMOS type switching tube M6 and pmos type are opened The grid for closing pipe M5 is connected by reverser with Preceding stage control device.Wherein, when switch control signal indicates to be connected, PMOS Type switching tube M5 conductings and the M6 disconnections of CMOS type switching tube；When switch control signal indicates to disconnect logical, pmos type switching tube M5 It disconnects and CMOS type switching tube M6 is connected.Wherein, pmos type switching tube M5 PMOS tube disconnect during prevent controlled electrical signal to Driving circuit submodule exports, and CMOS type switching tube M6 short circuit driving circuit submodules during PMOS tube disconnects so that 323 no current of driving circuit submodule exports.

The driving circuit submodule is connected with the first switch circuit submodule, the controlled telecommunications for will be received It number is converted into driving electric signal and exports.Here, the driving circuit submodule can utilize current mirror by controlled electrical signal with electricity Manifold formula exports, and with the driving electric signal of adjustment output to PMOS tube grid, and realizes adjustment PMOS tube source grid voltage whereby Purpose.As shown in fig. 7, the driving circuit submodule 323 includes the second current mirror (M7, M8), wherein the second current mirror Input terminal connects the output end of first switch circuit submodule, output end connects the grid of PMOS tube.Second current mirror Input current and output current are 1:N, wherein it is needed according to the actual design of circuit and the selection of PMOS tube, N may be less than 1, A kind of numerical value in equal to 1 or more than 1.Changed in mirror image using the electric current that outputs and inputs of current mirror, in PMOS tube from disconnection During state is transferred to conducting state, the electric current of the second current mirror outputs declines with the voltage of feedback signal and is increased, and so carries Pressure difference increases speed between the high source grid of PMOS tube.

Here, it should be noted that CMOS type, pmos type electronics used in the above-mentioned mentioned control circuit Device is only for example, rather than the limitation to the application.In fact, CMOS type and pmos type electronic device can be according to actual designs It needs and is replaced.For example, CMOS type switching tube and can be replaced corresponding triode (BJT), junction type with pmos type switching tube Field-effect transistor (JFET), depletion type (depletion) MOS power tubes, any one of silicon-controlled (or thyristor) etc..

When the control circuit receives the switch control signal for indicating to disconnect, the first control in the control circuit First switch circuit submodule in circuit module disconnects so that the source grid voltage of PMOS tube is by second control circuit module control System.Second control circuit module connects the PMOS tube, when receiving the switch control signal of corresponding disconnection, described in adjustment Pressure difference between the source electrode and grid of PMOS is so that the PMOS tube is transferred to off-state.Wherein, the second control circuit mould Block can the disconnection based on first control circuit module and adjust PMOS source grid voltage.For example, the second control circuit module Including the resistance being connected between the grid of source, and as pull-up circuit submodule.When first control circuit module disconnects, PMOS source grid voltage is limited to less than in the voltage range of conducting voltage threshold value by resistance.

In some specific examples, the second control circuit mould pull-up circuit submodule in the block is described including being connected to Switching tube Mpull_up between the grid and source electrode of PMOS tube.The source electrode and drain electrode of switching tube Mpull_up is corresponding respectively to be connected The source electrode and drain electrode of PMOS tube is connect, grid receives switch control signal.Turn-on command is indicated with high level in switch control signal, Switching tube is for pmos type switching tube, when switch control signal is high level, pmos type switching tube disconnects, the source of PMOS tube Grid voltage is controlled by first control circuit module；When switch control signal is low level, the conducting of pmos type switching tube is opened, The source grid voltage of PMOS tube is disconnected because pmos type switching tube is connected.

In other specific example, the second control circuit module further includes second switch circuit submodule.Switch The output end of the grid connection second switch circuit submodule of pipe Mpull_up.The second switch circuit submodule is opened by described Control signal control is closed, conducting is to control on the pull-up circuit submodule when receiving the switch control signal of corresponding disconnection The voltage at the driving end is adjusted, and is disconnected when receiving the switch control signal of corresponding conducting.As shown in fig. 7, described Two switching circuit submodules 33 include concatenated resistance R4, switching tube M9 and resistance R3, wherein the grid reception of switching tube M9 is opened Control signal is closed, is drained through resistance F4 access supply lines and is connected with the grid of switching tube Mpull_up, source electrode passes through electricity Hinder R3 ground connection.When switch control signal indicates to disconnect, switching tube M9 and Mpull_up are both turned on, and PMOS source grid voltage is almost It is equal so that PMOS tube disconnect；When switch control signal indicates to be connected, switching tube M9 and Mpull_up are disconnected, PMOS source grid Pole tension is controlled by first control circuit module 32.

It should be noted that in order to make first control circuit module and second control circuit module alternately control PMOS tube Grid, first control circuit mould first switch circuit submodule in the block and second control circuit mould second switch in the block electricity Way module is controlled by different switch control signals.For example, first switch circuit submodule is high electricity in switch control signal When conducts, second switch circuit submodule is disconnected when switch control signal is high level.

In some embodiments, to prevent two control circuit modules from being triggered simultaneously by certain interference, electricity is such as controlled Interference is lagged in road caused by parasitic capacitance charge and discharge etc., the control circuit further includes non-overlapping control signal generation unit (being unillustrated), for exporting the non-overlapping switch control signal of two-way based on the switch control signal received, wherein institute is defeated The first switch control signal gone out is transferred to off-state for controlling the PMOS tube, and the second switch control signal exported is used It is transferred to conducting state in controlling the PMOS tube.Specifically, as shown in fig. 7, the non-overlapping control signal generation unit conduct The access unit of the control circuit and Preceding stage control device receives switch control signal, and the switch received is controlled and is believed It number is converted into the switch control signal of two-pass DINSAR, i.e. first switch control signal Pull-down and second switch controls signal Pull-up.The high level control PMOS tube that the first control circuit can control signal Pull-down based on first switch is led It is logical, and the low level based on first switch control signal not provides control operation；Accordingly, the second control circuit is based on The high level control PMOS tube that second switch controls signal Pull-up disconnects, and based on second switch control signal Pull-up's Low level not provides control operation.

Now by taking Fig. 7 as an example, the control circuit controls the control process citing of PMOS tube based on switch control signal such as Under：Non-overlapping control signal generation unit in the control circuit is non-overlapping by the switch control signal received classification two-way Switch control signal, i.e. differential switch controls signal, and first switch controls signal Pull-down and second switch and controls signal Pull-up.Wherein, first switch control signal Pull-down input first switch circuits submodule 322, second switch control Signal Pull-up input second switch circuits submodule 33.Wherein, the first switch control signal Pull-down and switch The waveform for controlling signal is consistent, and second switch control signal Pull-up and the waveform of switch control signal are reversed；First switch Circuit submodule 322 and second switch circuit submodule 331 are effective with high level.I.e. when first switch control signal is high electricity When flat and second switch control signal is low level, the conducting of first switch circuit submodule 322 and second switch circuit submodule Block 331 disconnects；When first switch control signal is low level and second switch control signal is high level, first switch electricity Way module 322 disconnects and second switch circuit submodule 331 is connected.Sampling resistor R1, the first electricity in the control circuit Stream mirror (M1, M2) and the sampling units 31 that are constituted of feedback resistance R2 are by the source of the PMOS tube sampled by the sampling resistor R1 Grid pressure difference is converted into flowing to the electric current of feedback resistance R2 via the first current mirror (M1, M2), defeated using the feedback resistance R2 Go out feedback signal, wherein the voltage of the feedback signal becomes larger with source grid pressure difference and become larger.Current source submodule 321 with adopt Sample unit 31 is connected, and wherein the feedback signal received is converted into controlled telecommunications by the bigoted current sources of power tube M3 and power tube M4 Number and be transferred to first switch circuit submodule 322, when first switch control signal Pull-down is high level, first opens Reverser in powered-down way module 322, which is converted into low level and exports, gives switching tube M5 and M6, wherein M5 disconnections, M6 Conducting, the controlled electrical signal are transferred to the grid of PMOS tube via the M6 and the second current mirror (M7, M8) for being connected with M6 of conducting Between pole and ground, the driving electric signal for flowing to PMOS tube grid has been shunted so that the driving electric signal increases with feedback electric signal Reduce greatly.

It should be noted that the structure of above-mentioned each control circuit is merely illustrative, rather than the limitation to the application.This field skill The change for the circuit structure that art personnel carry out under the technological thought proposed according to the application is regarded as the application and is covered The specific example of lid not enumerates herein.For example, first switch circuit submodule is arranged in sampling unit, so as to Sampling is started or stopped based on switch control signal in the first current mirror.For another example, first switch circuit submodule is arranged in electricity Before the submodule of stream source, in order to current source submodule started or stopped based on switch control signal feedback signal is converted to it is controlled Electric signal etc..

The application also provides a kind of chip.The chip includes the control circuit for controlling PMOS tube conducting and disconnecting. The control circuit is as shown in Fig. 3-Fig. 7 and its corresponding description, and details are not described herein.

Referring to Fig. 8, it is shown as the encapsulation schematic diagram of the chip comprising above-mentioned control circuit.The chip includes multiple Pin, wherein the pin includes：For connecting the first pin (VCC) of supply line, for the second pin of ground connection (GND), the third pin (EN) etc. for receiving switch control signal.When the constant voltage source in above-mentioned control circuit is external electricity When source, the chip also includes the 4th pin (VDD) etc. for connecting constant voltage source.The circuit knot that can be integrated according to chip Structure, the chip can also include the 5th pin (G) for being connected with PMOS tube grid, wherein the PMOS tube is one kind Switching tube, and control circuit in by the chip controls.Alternatively, the PMOS tube is integrated in the chip, and accordingly, institute Stating chip has the 6th pin for the drain electrode of PMOS tube is connected with external subsequent conditioning circuit.Wherein, the subsequent conditioning circuit Including but not limited to：Resonance circuit, load etc..

In some embodiments, in order to control the PMOS tube with bigger driving power, include switch in the chip Circuit, wherein the switching circuit includes the first control circuit and the first PMOS tube, and the switching circuit is for controlling the Two PMOS tube switch to off-state by conducting state, described in order to realize that the second PMOS tube switchs to conducting state by off-state Chip further includes second control circuit.Referring to Fig. 9, it is shown as first control circuit 41 in the chip, the first PMOS tube 42 and the structural schematic diagram that is connect respectively with the second PMOS tube 43 of second control circuit 44.The first control circuit 41 and first PMOS tube 42 is the control circuit and PMOS tube as described in any in Fig. 3-Fig. 7, in this example, the first control circuit 41 With the first PMOS tube 42 off-state is transferred to for controlling the second PMOS tube 43.The second control circuit 44 is for controlling second PMOS tube 43 switchs to conducting state from off-state.The second control circuit 44 is based on the switch control signal received to institute The grid for stating the second PMOS tube 43 provides driving electric signal；Wherein, second PMOS tube 43 is being controlled from off-state guide Logical state transition period, the pressure difference between the driving electric signal and the source electrode and grid of second PMOS tube 43 become in reversed Change relationship.

In a specific example, as shown in figure 9, the second control circuit 44 is controlled comprising sampling unit 441 and first Circuit module 442.Wherein, the sampling unit 441 is connect with the grid of the second PMOS tube 43, samples second PMOS tube 43 Source electrode and grid between pressure difference and in the form of feedback signal export.First control circuit module 442 is also with described second The grid of PMOS tube 43 is connected, the driving electricity of the variation adjustment output based on the feedback signal received to the PMOS tube grid Signal.

Here, sampling unit and first control circuit module in second control circuit respectively in first control circuit Sampling unit and first control circuit mould structure in the block and implementation procedure are same or similar, and this will not be detailed here.Such as institute in Fig. 9 First control circuit module 412 in the first control circuit 41 shown is that high level is effective, first in second control circuit 44 Control circuit module 442 is that low level is effective.When switch control signal is using high level as open command, first control circuit 41 In first control circuit module 412 conducting and second control circuit 44 disconnect, therefore the first PMOS tube 42 conducting and the 2nd PMOS Pipe 43 disconnects；When switch control signal is using low level as turn-on command, the first control circuit mould in first control circuit 41 Block 412 disconnects and second control circuit 44 is connected, therefore the first PMOS tube 42 disconnects and the second PMOS tube 43 is connected.

According to the design needs, it can be integrated with multistage PMOS tube and its control circuit in the chip, wherein in adjacent grade Join in PMOS tube, the pull-up circuit submodule of previous stage PMOS tube and corresponding control circuit as rear stage PMOS tube, with It realizes to provide rear stage PMOS tube and disconnects control, so realize and the switch of the PMOS tube of big driving power is controlled.

Multiple such as Fig. 7, switching circuits shown in Fig. 9 can also be integrated in the chip, and in each switching circuit Control circuit individually controls connected PMOS tube.Wherein, the PMOS tube connected can integrate in the chip or be drawn by chip Foot is connected with the switching circuit in chip.

In some specific examples, 0 and Figure 11 are please referred to Fig.1, wherein Figure 10 is shown as multiple control circuits and is connected PMOS tube is in parallel and the source electrode of each PMOS tube accesses same supply line jointly, Figure 11 is shown as multiple control circuits and connects The source electrode of the PMOS tube parallel connection and each PMOS tube that connect is independently accessed respective supply line.By taking LED load as an example, each PMOS tube Late-class circuit includes LED load, and the front stage circuits that the late-class circuit connected according to each PMOS tube is connected with each control circuit are set Meter needs, and each PMOS tube can be independently accessed respective supply line or the same supply line of public access；Before each control circuit Grade control device can export the PWM letters of duty ratio corresponding based on the lamp light mode option that user selects to respective control circuit Number, each control circuit individually controls PMOS tube to control the light intensity and light frequency of each LED load according to the pwm signal received Rate.

In other specific examples, 2 are please referred to Fig.1, multiple control circuits is shown as and controls concatenated PMOS tube Electrical block diagram.Still by taking LED load as an example, each PMOS tube is connected and each PMOS tube individually connects LED load, each to control The pwm signal control that circuit is provided by Preceding stage control device, wherein the light modulation that the Preceding stage control device is selected based on user Strong and weak option exports the pwm signal of duty ratio corresponding to each control circuit, fine and smooth, the light intensity variation range in order to provide light intensity variation Wide brightness adjustment control.

The application also provides a kind of switching device, and all kinds of drives are used in by chip or in a manner of being integrated in pcb board In dynamic system and control system.The switching device is using PMOS tube as switching device, and specifically, the switching device includes at least One switching circuit.The switching circuit includes such as Fig. 3-any control circuits shown in Fig. 7 and PMOS tube.Wherein, described The grid of PMOS tube connects the control circuit.The control circuit is based on the switch control signal received to the PMOS tube Grid driving electric signal is provided, the PMOS tube is based on the driving electric signal between conducting state and off-state turn It changes；Wherein, the PMOS tube is being controlled from off-state guide logical state transition period, the driving electric signal and the PMOS Pressure difference between the source electrode and grid of pipe is in inverse change relationship.

When the switching device executes conducting operation based on the switch control signal received, first in control circuit Control circuit module is provided with source grid voltage variation using the PMOS tube source grid voltage that sampling unit is provided in anti- To the driving electric signal of variation, to accelerate PMOS tube switching to conducting state by off-state；When the switching device is based on institute When the switch control signal of reception executes opening operation, the second control circuit module in control circuit utilizes switching tube by PMOS The source grid voltage of pipe is instantaneously down to conducting voltage threshold value hereinafter, to accelerate PMOS tube switching to off-state by conducting state.

In some embodiments, the PMOS tube in the switching circuit need to rely on the driving of multistage PMOS tube to be led to realize On and off is opened, for this purpose, the switching circuit further includes another control circuit, for ease of distinguish a kind of control circuit above-mentioned and A kind of control circuit above-mentioned is now known as first control circuit, and and first control circuit by another control circuit now stated Connected PMOS tube is the first PMOS tube, and another control circuit is known as second control circuit, and with second control circuit phase PMOS tube even is the second PMOS tube.As shown in figure 9, the first control circuit 41 and the first PMOS tube 42 are for controlling second PMOS tube 43 switchs to off-state by conducting state, and the second control circuit 44 is for controlling second PMOS tube 43 by breaking Open state switchs to conducting state.Here, described in the circuit structure and the course of work of the switching circuit and aforementioned chip The circuit structure and the course of work of switching circuit are same or similar, and details are not described herein.

In yet other embodiments, include multiple switch circuit as shown in Figure 10-Figure 12, in the switching device, and Control circuit individually controls connected PMOS tube in each switching circuit.Here, the circuit structure of the switching circuit and The course of work is identical as the circuit structure of the switching circuit of Figure 10-Figure 12 described in aforementioned chip and the course of work or phase Seemingly, details are not described herein.

The application also provides a kind of control method, please refers to Fig.1 3, is shown as the control method in a kind of embodiment party Flow chart in formula.The control method is executed by aforementioned any control circuit or other are able to carry out the control The control system of method executes.

In step s 110, switch control signal is obtained.Wherein, the switch control signal can be Preceding stage control device The pwm signal of offer or other square-wave signals.Here, the Preceding stage control device can be with digital operation and logical process The device of ability may include CPU, MCU or other programmable logic device etc., and but it is not limited to this.For example, the prime control Device processed is the control panel of LED load, is believed to control circuit output respective switch control according to the instruction of user's operation Number.For another example, the Preceding stage control device is feedback control circuit, according to defeated to control circuit through the obtained information of feedback processing Go out respective switch control signal.

In the step s 120, based on being turned on or off represented by the switch control signal, control PMOS tube executes phase The operation that is turned on or off answered.

Here, conducting and disconnection represented by switch control signal of the control circuit according to the Preceding stage control device connected It instructs and designs its response control.For example, when switch control signal is that high level indicates turn-on command, the control circuit needs The grid voltage for reducing PMOS tube makes the source grid voltage difference of PMOS tube be more than or equal to the voltage threshold of semiconductor devices conducting, To realize that PMOS tube is connected；When switch control signal is that low level indicates open command, the control circuit need to be increased to The grid voltage of PMOS tube makes the source grid voltage difference of PMOS tube be less than the voltage threshold, to realize that PMOS tube disconnects.It needs Understand, according to the design needs, the control circuit can also be based on low level switch control signal and execute conducting PMOS tube, and Switch control signal based on high level, which executes, disconnects PMOS tube.

When acquired switch control signal indicates that the PMOS tube is connected, to the grid output driving of the PMOS tube Electric signal；Lead to the state transition period from off-state guide in the PMOS tube, the driving electric signal and the PMOS tube Source grid pressure difference is in inverse change relationship.

Using the electrical connection with PMOS source grid, control circuit (or control system) can obtain the source grid of PMOS tube Pressure difference, when receiving the switch control signal for indicating conducting, control circuit (or control system) utilizes controlled source technology or mirror The pressure difference is converted into changing opposite driving electric signal therewith by image current technology so that the source grid pressure difference of PMOS tube is gradual The electric current of the driving electric signal gradually decreases while increase, thus shortens the arrival of the pressure difference between gate pmos source electrode and leads The duration of logical threshold value.

In some embodiments, the control circuit sample the pressure difference between the source electrode and grid of the PMOS tube and with Feedback signal form exports.The control circuit is based on the switch control signal and the feedback signal received to the PMOS The grid of pipe provides driving electric signal.

Wherein, the control circuit includes the sampling resistor being arranged between the grid of PMOS tube source, the feedback signal by Described sampling resistor one end voltage indicates.By taking the PMOS tube of gate driving shown in fig. 5 as an example, come by adjusting grid voltage Pressure difference between the grid of adjustment PMOS tube source, therefore, the feedback signal is indicated by the side voltage that sampling resistor is connected with grid.

In some embodiments, the electric signal of the source grid of the PMOS tube is sampled；It will be sampled using a current mirror The signal of electricity is converted to feedback signal；And the feedback signal is converted to by driving electric signal based on the switch control signal And it exports to the grid of the PMOS tube.

As shown in figure 5, the sampling unit in the control circuit include sampling resistor R1, the first current mirror (M1, M2) and Feedback resistance R2, wherein the source electrode of two triodes (M1, M2) and the source electrode of PMOS tube of first current mirror access jointly The input terminal of supply line, the first current mirror connects sampling resistor R1, and output end connection feedback resistance R2 is simultaneously connect by resistance R2 The output end on ground, first current mirror is additionally operable to connection control unit.The sampling resistor R1 is acquired by the first current mirror Pressure difference between the source grid of PMOS tube, and feedback signal is converted by first current mirror and is supplied to control unit.Its In, the first current mirror input terminal electric current and output end current can be M:1, wherein M be less than 1, be equal to 1 or more than 1 in A fixed value.When PMOS tube is controlled go to conducting state from off-state during when, PMOS tube source grid pressure difference is as shown in Figure 1 Become larger, also correspondence becomes larger for the pressure difference at sampling resistor both ends, and the mirror image through the first current mirror transmits, the first current mirror export to The electric current of feedback resistance R2 gradually increases, and accordingly, the voltage at the ends feedback resistance R2 becomes larger, i.e., from the feedback resistance R2 The feedback signal exported becomes larger.

In the structure of control circuit shown in Fig. 5, control unit 12 of the PMOS tube in by control circuit controls.It is described Control unit 12 controls the pressure difference before the grid of PMOS tube source especially by the size of current for adjusting the grid for flowing to PMOS tube, And then realize being turned on or off for PMOS tube.When control unit 12 receives the switch control signal of conducting, by what is received Feedback signal is transferred in the current branch where PMOS tube grid so that grid voltage increases and reduces based on feedback signal. In this way, the turn on process of PMOS tube by feedback signal gradually it is increased influence, be provided to grid driving electric signal (electric current believe Number) gradually decrease, and when PMOS tube is connected, export to the electric current minimum of the driving electric signal of grid.When control unit 12 connects When receiving the switch control signal of disconnection, the transmission line of the feedback signal can be disconnected so that the variation of feedback signal can not It acts in the current branch where grid, in this way, the grid voltage of PMOS tube will then revert to the voltage before PMOS tube conducting, i.e., PMOS tube is transferred to off-state.

In some embodiments, step S120 further includes that the feedback signal is converted to controlled electrical signal, it is described by The variation for controlling electric signal is identical as feedback signal；The controlled electrical signal received is converted based on the switch control signal received At driving electric signal and export.

The current source submodule 221 is connected with the sampling unit 21, is changed according to the feedback signal for exporting Controlled electrical signal.Here, connect a constant voltage source (VDD) in the current source submodule 221, with to current source submodule Active device power supply in 221.

Include controlled current source (being unillustrated), the controlled current source and sampling in the current source submodule 221 The output end of unit 21 is connected, the electric signal exported inverse change with the variation of the feedback signal.For example, described controlled Current source is pmos type power tube, source electrode connect the constant voltage source (VDD), grid connection sampling unit 21 output end, Drain electrode connection first switch circuit submodule 222, it is described to adopt when control circuit receives the switch control signal for indicating conducting The voltage for the feedback signal that sample unit 21 exports reduces, and the grid voltage of the corresponding pmos type power tube reduces, and drain electrode is defeated The electric current of the controlled electrical signal gone out becomes larger, and such controlled electrical signal is in inverse change relationship, first control circuit with feedback signal Subsequent conditioning circuit submodule in module 22 can be by zooming in and out the controlled electrical signal, reversely to adjust output to PMOS The driving electric signal of tube grid.

Here, it should be noted that CMOS type, pmos type electronics used in the above-mentioned mentioned control circuit Device is only for example, rather than the limitation to the application.In fact, CMOS type and pmos type electronic device can be according to actual designs It needs and is replaced.For example, CMOS type switching tube and can be replaced corresponding triode (BJT), junction type with pmos type switching tube Field-effect transistor (JFET), depletion type (depletion) MOS power tubes, any one of controllable silicon dimmer etc..

When the control circuit receives the switch control signal for indicating to disconnect, step 122 is executed：Disconnect the PMOS Pipe.

When the control circuit receives the switch control signal for indicating to disconnect, the first control in the control circuit Circuit module disconnects, the second control circuit module control of the source grid voltage of PMOS tube in by the control circuit.Second control Circuit module processed connects the PMOS tube, when receiving the switch control signal of corresponding disconnection, adjusts the source electrode of the PMOS Pressure difference between grid is so that the PMOS tube is transferred to off-state.Wherein, the second control circuit module can be based on the The disconnection of one control circuit module and adjust PMOS source grid voltage.For example, the second control circuit module includes being connected to Resistance between the grid of source, and as pull-up circuit submodule.When first control circuit module disconnects, resistance is by PMOS Source grid voltage is limited to less than in the voltage range of conducting voltage threshold value.

In some embodiments, step S120 further includes controlling a pull-up circuit submodule based on the switch control signal Block raises the grid voltage of the PMOS tube so that the step of PMOS tube is transferred to off-state.

In other specific example, the second control circuit module further includes second switch circuit submodule.Switch The output end of the grid connection second switch circuit submodule of pipe Mpull_up.The second switch circuit submodule is opened by described Control signal control is closed, conducting is to control on the pull-up circuit submodule when receiving the switch control signal of corresponding disconnection Adjust the voltage at the driving end；And disconnected when receiving the switch control signal of corresponding conducting, so it is disconnected on described The up-regulation of puller circuit submodule operates.As shown in fig. 7, the second switch circuit submodule 33 includes concatenated resistance R4, opens Close pipe M9 and resistance R3, wherein the grid of switching tube M9 receives switch control signal, drain electrode accesses supply line by resistance F4 And be connected with the grid of switching tube Mpull_up, source electrode is grounded by resistance R3.When switch control signal indicates to disconnect, switch Pipe M9 and Mpull_up are both turned on, and PMOS source grid voltage is almost equal so that PMOS tube disconnects；When switch control signal indicates When conducting, switching tube M9 and Mpull_up are disconnected, and PMOS source grid voltage is controlled by first control circuit module 32.

In some embodiments, to prevent two control circuit modules from being triggered simultaneously by certain interference, electricity is such as controlled Interference is lagged in road caused by parasitic capacitance charge and discharge etc., the control method further includes based on the switch control signal received The step of output two-way non-overlapping switch control signal, (is unillustrated), wherein the first switch control signal exported is used for It controls the PMOS tube and is transferred to off-state, the second switch control signal exported is transferred to conducting for controlling the PMOS tube State.Specifically, access list of the non-overlapping control signal generation unit as the control circuit and Preceding stage control device Member receives switch control signal, and the switch control signal received is converted into the switch control signal of two-pass DINSAR, i.e., and the One switch control signal and second switch control signal.The first control circuit can control the height electricity of signal based on first switch Flat control PMOS tube conducting, and the low level based on first switch control signal not provides control operation；Accordingly, described The high level control PMOS tube that two control circuits control signal based on second switch disconnects, and controls signal based on second switch Low level not provides control operation.

In conclusion control circuit provided herein from off-state in PMOS tube due to switching to the conducting state phase Between, provide the driving electric signal of one and PMOS source grid voltage difference inverse change so that grid voltage declines more quickly, has Effect improves the response speed of PMOS tube conducting.In addition, when being gradually transferred to conducting state from off-state with PMOS tube, source grid Extreme pressure difference gradually increases so that the driving electric signal that control circuit is provided from large to small, also achieves control circuit and is being connected The target of period in-fighting minimum.

The principles and effects of the application are only illustrated in above-described embodiment, not for limitation the application.It is any ripe Know the personage of this technology all can without prejudice to spirit herein and under the scope of, carry out modifications and changes to above-described embodiment.Cause This, those of ordinary skill in the art is complete without departing from spirit disclosed herein and institute under technological thought such as At all equivalent modifications or change, should be covered by claims hereof.

Claims

1. a kind of control circuit of PMOS tube, which is characterized in that based on the switch control signal received to the PMOS tube Grid provides driving electric signal；Wherein, the PMOS tube is being controlled from off-state guide logical state transition period, the driving Pressure difference between electric signal and the source electrode and grid of the PMOS tube is in inverse change relationship.

2. the control circuit of PMOS tube according to claim 1, which is characterized in that including：

Sampling unit is sampled the pressure difference between the source electrode and grid of the PMOS tube and is exported in the form of feedback signal；

Control unit is connected with the grid of the sampling unit and the PMOS tube, for controlling letter based on the switch received Number and the feedback signal to the grid of the PMOS tube provide driving electric signal；Wherein, the PMOS tube is being controlled from disconnection State guide is led to the state transition period, and the driving electric signal is in inverse change relationship with feedback signal.

3. the control circuit of PMOS tube according to claim 2, which is characterized in that the sampling unit includes：

The sampling resistor being connected with the grid of the PMOS tube；

First current mirror, input terminal connect the sampling resistor, and output end connects a feedback resistance, for that will come from the sampling The sampling electric signal of resistance is transferred to the feedback resistance, to form feedback signal.

4. the control circuit of PMOS tube according to claim 3, which is characterized in that described control unit includes：First control Circuit module processed is connected with the grid of the PMOS tube；

The first control circuit module is when receiving the switch control signal of corresponding conducting, based on the feedback signal received Variation adjustment output to the PMOS tube grid driving electric signal.

5. the control circuit of PMOS tube according to claim 4, which is characterized in that the first control circuit module packet It includes：

Current source submodule is connected with the sampling unit, for exporting the controlled electrical signal changed according to the feedback signal；

First switch circuit submodule receives switch control signal and is simultaneously connected with the current source submodule, for being received Switch control signal be turned on or off；

Driving circuit submodule is connected with the first switch circuit submodule, for converting the controlled electrical signal received At driving electric signal and export.

6. the control circuit of PMOS tube according to claim 5, which is characterized in that the current source submodule includes：By Control current source.

7. the control circuit of PMOS tube according to claim 2, which is characterized in that described control unit includes：Second control Circuit module processed connects the PMOS tube, when receiving the switch control signal of corresponding disconnection, adjusts the source electrode of the PMOS Pressure difference between grid is so that the PMOS tube is transferred to off-state.

8. the control circuit of PMOS tube according to claim 7, which is characterized in that the second control circuit module packet It includes：Pull-up circuit submodule is connected between the grid and source electrode of the PMOS tube.

9. the control circuit of PMOS tube according to claim 8, which is characterized in that the second control circuit module is also wrapped It includes：By the second switch circuit submodule that the switch control signal controls, it is connected with the pull-up circuit submodule, works as reception It is connected when to the corresponding switch control signal disconnected, to control the voltage that the pull-up circuit submodule raises the grid, with And it is disconnected when receiving the switch control signal of corresponding conducting.

10. the control circuit of PMOS tube according to claim 1 or claim 7, which is characterized in that further include：Non-overlapping control letter Number generation unit, for based on the non-overlapping switch control signal of the switch control signal output two-way received, wherein institute is defeated The first switch control signal gone out is transferred to off-state for controlling the PMOS tube, and the second switch control signal exported is used It is transferred to conducting state in controlling the PMOS tube.

11. a kind of switching device, which is characterized in that including at least one switching circuit；

The switching circuit includes：Control circuit and PMOS tube as described in any in claim 1-10；Wherein, the PMOS The grid of pipe connects the control circuit；

The control circuit provides driving electric signal based on the switch control signal received to the grid of the PMOS tube, described PMOS tube is converted based on the driving electric signal between conducting state and off-state；Wherein, the PMOS tube is being controlled certainly To the conducting state transition period, the pressure difference between the driving electric signal and the source electrode and grid of the PMOS tube is in off-state Inverse change relationship.

12. switching device according to claim 11, which is characterized in that the switching circuit also includes the second control electricity Road；Wherein, the control circuit in the switching circuit and PMOS tube are switched to disconnect for controlling the second PMOS tube by conducting state State, the second control circuit switch to conducting state for controlling second PMOS tube by off-state.

13. switching device according to claim 11 or 12, which is characterized in that the quantity of the switching circuit be it is multiple, And control circuit individually controls connected PMOS tube in each switching circuit.

14. a kind of chip, which is characterized in that including：Control circuit as described in any in claim 1-10.

15. chip according to claim 14, which is characterized in that further include the PMOS tube being connected with the control circuit, Wherein, a switching circuit is at least formed by the control circuit and PMOS tube.

16. chip according to claim 15, which is characterized in that the switching circuit also includes second control circuit；Its In, control circuit and PMOS tube in the switching circuit switch to off-state for controlling the second PMOS tube by conducting state, The second control circuit switchs to conducting state for controlling second PMOS tube by off-state.

17. chip according to claim 15 or 16, which is characterized in that the quantity of the switching circuit is multiple, and each Control circuit individually controls connected PMOS tube in the switching circuit.