CN205336105U - Multistage voltage output switching power supply converter and pressure release control module thereof - Google Patents
Multistage voltage output switching power supply converter and pressure release control module thereof Download PDFInfo
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- CN205336105U CN205336105U CN201620079461.7U CN201620079461U CN205336105U CN 205336105 U CN205336105 U CN 205336105U CN 201620079461 U CN201620079461 U CN 201620079461U CN 205336105 U CN205336105 U CN 205336105U
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Abstract
The utility model discloses a multistage voltage output switching power supply converter and pressure release control module thereof, wherein pressure release control module includes: delay circuit receives the switching control signal of voltage request module, will switch the switch tube control signal that the control signal delayed time processing becomes control voltage change over switch pipe ON / OFF, the bleeder circuit receive to switch control signal, generates the control signal that releases according to switching control signal, the control signal that will release send respectively to the release switch tube and the PWM control module of switching power supply converter to the output electric quantity of control switch source transformation ware, shielding PWM control module is because of the output overvoltage protection signal of the instantaneous rising spurious triggering of feedback voltage, the drive modulating signal that PWM control module generated is received to the resetting circuit, and modulating signal resets according to this drive control signal releases. The utility model discloses a source transformation ware of pressure release control reduces power consumption, improves stability, reliability and security that switch source transformation ware used.
Description
Technical field
This utility model relates to switching power converters field, especially relates to a kind of multilevel voltage output switch power source changer and pressure release control method thereof and module。
Background technology
Switching power converters has that volume is little, efficiency is high and the advantage of big electric current, is therefore widely used in the portable electric appts such as charger for mobile phone。In recent years, along with portable electric appts battery capacity is continuously increased, charging rate is had higher requirement。In order to improve charging rate, current industry proposes two kinds and realizes method, and one is increase charging current, is second improve charging voltage, and wherein second method has become industry main flow。
In order to realize improving the purpose of charging voltage, simultaneously backward compatible standard charge voltage (5V) again, also two kinds are had to realize method, one is use regular tap supply convertor to carry a special interface chip, and two is use the switching power converters incorporating interface chip function, supporting multilevel voltage output。This utility model relates to multilevel voltage output switch power source changer。
Fig. 1 is the rough schematic view of an asynchronous rectified DC/DC switching power converters topology of voltage-dropping type supporting two step voltage outputs。DC input voitage 411 is input to the Vin port of switch power controller 400, and PWM controls module 401 and controls the turn-on and turn-off of power switch pipe 404, persistently output is powered by inductor winding 405 and fly-wheel diode 406。First resistance the 407, second resistance 408 and the 3rd resistance 409 form sampling network, output voltage is sampled, and by the FB port to switch power controller 400, feeds back to PWM and control module 401, be converted to the conducting dutycycle of power switch pipe 404, be derived from stable output voltage。
During switch power controller 400 normal operation, under default setting, the output signal Vo_up of voltage request module 402 is low level, voltage change-over switch pipe 403 ends, now the 3rd resistance 409 branch road disconnects, sampling network is only connected by the first resistance 407 and the second resistance 408, and output voltage is standard charge voltage (5V)。When high voltage exports the request signal 412 Vreq port by switch power controller 400, it is input to voltage request module 402, its output signal Vo_up becomes high level, voltage change-over switch pipe 403 turns on, now the 3rd resistance 409 branch road conducting, under sampling network, to become the second resistance 408 in parallel with the 3rd resistance 409 for resistance, and change is compared in sampling, output voltage rises, it is achieved high voltage exports。
In practice, when power receiving equipment removes or voltage request signal becomes normal voltage output request, switch power controller output voltage needs to be transferred to low-voltage by high voltage。This process required time is determined by exporting electric current, when output no-load, this process is likely to very long, if accessing again another incompatible high-tension power receiving equipment when output voltage not yet returns to normal voltage output, then easily cause power receiving equipment impaired, so in order to accelerate conversion speed, adding resistance 410 as fictitious load, but owing to resistance 410 branch road is constantly on when system works, cause power attenuation。In addition; when output voltage is changed from high to low; due to sampling network structural change; cause that feedback voltage is instantaneous to be elevated; this often triggers PWM output over-voltage protection (OVP) mechanism controlling to comprise in module 401; switch power controller 400 is caused unnecessarily to enter protected mode, if but cancel output OVP mechanism, reliability and the safety of transducer can be reduced again。
About the problem that fictitious load loss power and overvoltage protection mechanism can not suitably start, it is need solution problem。
Utility model content
Main purpose of the present utility model is for providing a kind of without fictitious load, and controls multilevel voltage output switch power source changer and the pressure control module thereof that overvoltage protection mechanism suitably starts。
In order to realize above-mentioned utility model purpose, this utility model provides the pressure control module of a kind of multilevel voltage output switch power source changer, including delay circuit, leadage circuit and reset circuit；
Described delay circuit receives the switch-over control signal of voltage request module, and becomes to control the open/close switch controlled signal of voltage change-over switch pipe by switch-over control signal delay process, to control the circuit structure of the sampling network module of described pass supply convertor；
Described leadage circuit receives switch-over control signal; control signal of releasing is generated according to switch-over control signal; and control signal of releasing is respectively sent to release switching tube and the PWM control module of described switching power converters; to control the output electricity of switching power converters, and shielding PWM control module because of feedback voltage instantaneous rising the overvoltage protection signal of false triggering；
Described reset circuit reception PWM controls the driving modulation signal that module generates, and modulates, according to this driving, control signal of releasing described in signal replacement。
Further, described delay circuit includes time delay buffer,
The input of described time delay buffer connects described voltage request module, and outfan connects described voltage change-over switch pipe。
Further, described leadage circuit includes monopulse generator and rest-set flip-flop；
The switch-over control signal receiving described voltage request module of described monopulse generator, and convert switch-over control signal to positive pulse signal；
Described rest-set flip-flop described positive pulse signal is converted to control signal of releasing be sent to described in release switching tube and PWM control module。
Further, described reset circuit includes three inputs and door, the first phase inverter, the second phase inverter and described rest-set flip-flop；
Described first phase inverter receives described PWM and controls the driving modulation signal of module, and is sent to three inputs and door after it is carried out anti-phase process；
Described second phase inverter receives the positive pulse signal that described monopulse generator generates, and sends after being carried out anti-phase process to three input and doors, the driving of anti-phase process is modulated signal and carries out blanking；
Described three inputs and door are released control signal described in receiving, and to control the on an off of this three input and door, when three inputs are opened with door, the drivings modulation signals of three inputs and the anti-phase process of goalkeeper send to described rest-set flip-flop and reset control signal of releasing。
This utility model also provides for a kind of multilevel voltage output switch power source changer, controls module and power switch pipe including voltage request module, control module of releasing, voltage change-over switch pipe, sampling network module, switching tube of releasing, PWM；
Described voltage request module receives external voltage request signal, and this voltage request signal is converted to voltage switching control signal be sent to described in release control module；
Described voltage switching control signal described in control module delay process of releasing, and generate the transmission of switch controlled signal to described voltage change-over switch pipe, to control the circuit structure of sampling network module；And generate, according to described voltage switching control signal, control signal of releasing; and control signal of releasing is respectively sent to release switching tube and PWM control module; to control to release the duty of switching tube, and shielding PWM control module because of feedback voltage instantaneous rising the overvoltage protection signal of false triggering；
Described PWM controls the driving modulation signal that module receives the feedback voltage generation correspondence of described sampling network module, controls the duty of described power switch pipe；And driving is modulated signal send to described in release control module, the control module that makes to release carries out replacement and releases control signal。
Further, described pressure control module includes delay circuit, leadage circuit and reset circuit；
Described delay circuit receives the switch-over control signal of voltage request module, and becomes to control the open/close switch controlled signal of voltage change-over switch pipe by switch-over control signal delay process, to control the circuit structure of the sampling network module of described pass supply convertor；
Described leadage circuit receives switch-over control signal; control signal of releasing is generated according to switch-over control signal; and control signal of releasing is respectively sent to release switching tube and the PWM control module of described switching power converters; to control the output electricity of switching power converters, and shielding PWM control module because of feedback voltage instantaneous rising the output over-voltage protection signal of false triggering；
Described reset circuit reception PWM controls the driving modulation signal that module generates, and modulates, according to this driving, control signal of releasing described in signal replacement。
Further, described delay circuit includes time delay buffer,
The input of described time delay buffer connects described voltage request module, and outfan connects described voltage change-over switch pipe。
Further, described leadage circuit includes monopulse generator and rest-set flip-flop；
The switch-over control signal receiving described voltage request module of described monopulse generator, and convert switch-over control signal to positive pulse signal；
Described rest-set flip-flop described positive pulse signal is converted to control signal of releasing be sent to described in release switching tube and PWM control module。
Further, described reset circuit includes three inputs and door, the first phase inverter, the second phase inverter and described rest-set flip-flop；
Described first phase inverter receives described PWM and controls the driving modulation signal of module, and is sent to three inputs and door after it is carried out anti-phase process；
Described second phase inverter receives the positive pulse signal that described monopulse generator generates, and sends after being carried out anti-phase process to three input and doors, the driving of anti-phase process is modulated signal and carries out blanking；
Described three inputs and door are released control signal described in receiving, and to control the on an off of this three input and door, when three inputs are opened with door, the drivings modulation signals of three inputs and the anti-phase process of goalkeeper send to described rest-set flip-flop and reset control signal of releasing。
Multilevel voltage output switch power source changer of the present utility model and pressure control module thereof; incorporate, in multilevel voltage output switch power source changer, control module of releasing; without arranging fictitious load; save the loss of power; promote the speed efficiency without infringement power supply of output voltage conversion, again can be compatible with existing output over-voltage protection mechanism；Meanwhile, leadage circuit is Self Adaptive Control, it is not necessary to presets and releases the time, has significantly high adaptability and motility。
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the multilevel voltage output switch power source changer of prior art；
Fig. 2 is that releasing of the multilevel voltage output switch power source changer of this utility model one embodiment controls the structured flowchart of module；
Fig. 3 is that releasing of this utility model one embodiment controls the circuit diagram of module；
Fig. 4 be this utility model one embodiment multilevel voltage output switch power source changer in the waveform diagram of each signal；
Fig. 5 is the circuit diagram of the multilevel voltage output switch power source changer of this utility model one embodiment。
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing。
Detailed description of the invention
Should be appreciated that specific embodiment described herein is only in order to explain this utility model, be not used to limit this utility model。
With reference to Fig. 2, this utility model embodiment also provides for the pressure control module of a kind of multilevel voltage output switch power source changer, including delay circuit 10, leadage circuit 20 and reset circuit 30；
Above-mentioned delay circuit 10 receives the switch-over control signal of voltage request module, and becomes to control the open/close switch controlled signal of voltage change-over switch pipe by switch-over control signal delay process, to control the circuit structure of the sampling network module of described pass supply convertor；
Above-mentioned leadage circuit 20 receives switch-over control signal; control signal of releasing is generated according to switch-over control signal; and control signal of releasing is respectively sent to release switching tube 202 and the PWM control module of described switching power converters; to control the output electricity of switching power converters, and shielding PWM control module because of feedback voltage instantaneous rising the overvoltage protection signal of false triggering；
Above-mentioned reset circuit 30 receives PWM and controls the driving modulation signal that module generates, and modulates, according to this driving, control signal of releasing described in signal replacement。
In the present embodiment, voltage request signal is converted to after voltage switching control signal is sent to switching power converters by voltage request module, by the time delay buffer of delay circuit 10, its delay process is obtained switch controlled signal, this switch controlled signal is identical with voltage switching control signal, the time simply sent out is delayed, for high level signal；When delay process voltage switching control signal, leadage circuit generates, according to voltage switching control signal, control signal of releasing, it is respectively sent to release switching tube and the PWM control module of described switching power converters, above-mentioned control signal of releasing becomes high level when the trailing edge of voltage switching control signal, now, the voltage output of switch controlled of releasing switching power converters is released, PWM controls the overvoltage protection signal in module and is released control signal shielding, voltage change-over switch pipe is made to turn off when voltage switching control signal generates and sends voltage change-over switch pipe, the circuit structure of sampling network module changes, raise consequently, it is possible to cause PWM to control the voltage in module, now owing to overvoltage protection signal is shielded, so overvoltage protection mechanism will not be triggered。Then PWM controls module and starts generation driving modulation signal control power switch pipe work; first drive control signal that the module of PWM control simultaneously produces sends to reset circuit 30; replacement is released control signal by reset circuit 30; make switching tube shutoff of releasing; stopping is released; stop the shielding to overvoltage protection signal simultaneously, make the PWM output over-voltage protection mechanism controlling module recover normal。
In the present embodiment, above-mentioned leadage circuit 20 includes monopulse generator and rest-set flip-flop；The switch-over control signal receiving described voltage request module of monopulse generator, and convert switch-over control signal to positive pulse signal；Rest-set flip-flop described positive pulse signal is converted to control signal of releasing be sent to described in release switching tube and PWM control module。When the level rising edge of voltage switching control signal and when keeping high and low level, the output of above-mentioned monopulse generator remains low level；After voltage switching control signal trailing edge arrival that and if only if, the positive pulse signal V of above-mentioned monopulse generator one fixing duration of outputO_DWN, output subsequently returns to low level, positive pulse signal VO_DWNProduce single direct impulse and be input to the S input of rest-set flip-flop so that it is the control signal Dischr that releases of Q output output becomes high level。
In the present embodiment, above-mentioned reset circuit 30 includes three inputs and door, the first phase inverter, the second phase inverter and described rest-set flip-flop；
Described first phase inverter receives described PWM and controls the driving modulation signal of module, and is sent to three inputs and door after it is carried out anti-phase process；Described second phase inverter receives the positive pulse signal that described monopulse generator generates, and sends after being carried out anti-phase process to three input and doors, the driving of anti-phase process is modulated signal and carries out blanking；Described three inputs and door are released control signal described in receiving, and to control the on an off of this three input and door, when three inputs are opened with door, the drivings modulation signals of three inputs and the anti-phase process of goalkeeper send to described rest-set flip-flop and reset control signal of releasing。In the present embodiment, three inputs and door receive the positive pulse signal V driving modulation signal and anti-phase process of anti-phase process respectivelyO_DWN, the positive pulse signal V of anti-phase processO_DWNThe driving modulation signal of anti-phase process is carried out elimination of hidden, when the control signal Dischr that releases becomes high level, three inputs unlock with door and turn on, when the driving modulation signal Drv that PWM control module sends is low level, three inputs and door output high level signal, this high level signal resets rest-set flip-flop so that it is the Q output signal control signal Dischr that releases becomes low level, makes switching power converters terminate the process of releasing。
With reference to Fig. 3, in one embodiment, above-mentioned control module of releasing specifically includes the input of rest-set flip-flop the 301, second phase inverter the 302, first phase inverter 306, three and door 303, time delay buffer 304, monopulse generator 305；First external input terminals the 311, second external input terminals 312, the first outside outfan 313 and the second outside outfan 314；The input of described time delay buffer 304 connects described voltage request module by described first external input terminals 311, and outfan connects described voltage change-over switch pipe by the described first outside outfan 313；The input of described monopulse generator 305 connects described voltage request module by described first external input terminals 311, and outfan connects the input of the second phase inverter 302 and the S input of rest-set flip-flop 301 respectively；Described three inputs are connected the outfan of described second phase inverter 302 with the first input end of door 303, second input connects the outfan of described first phase inverter 306, the input of the first phase inverter 306 connects described PWM by the second input and controls the outfan of module, and the 3rd input connects the Q output of described rest-set flip-flop 301；Outfan connects the R input of described rest-set flip-flop 301；The Q output of described rest-set flip-flop 301 by described second outside outfan 314 connect described in release switching tube and PWM controls module。The control module of releasing of the present embodiment, simple in construction, with low cost, its circuit can also be used in other embodiments, release require as long as being capable of control。Above-mentioned monopulse generator 305 can adopt RC discharge and recharge circuit to realize, it is possible to adopts digital circuit enumerator to realize。
With reference to Fig. 4 and Fig. 5, in the present embodiment, when described switching power converters 100 works, above-mentioned time delay buffer 304 receives voltage switching control signal V by the first external input terminals 311O_SW, after buffering time delay, obtain switch controlled signal VO_UP, and export through the first outside outfan 313；The voltage switching control signal V that described pulse generation module receivesO_SWRising edge and when keeping high and low level, its output remains low level；And if only if voltage switching control signal VO_SWAfter trailing edge arrives, the direct impulse signal of one fixing duration of output, output subsequently returns to low level；As described voltage switching control signal VO_SWTrailing edge when arriving, direct impulse signal produces single direct impulse and is input to the S input of described rest-set flip-flop 301 so that it is the control signal Dischr that releases of Q output output becomes high level；Meanwhile, single direct impulse signal is after the second phase inverter 302 is anti-phase, as lead-edge-blanking signal, drives modulation signal Drv to carry out blanking when state switches to described；After the described control signal Dischr that releases becomes high level, three inputs unlock with door 303, wait that described driving modulates signal Drv, when first switching signal driving modulation signal Drv arrives, noticing that driving modulation signal Drv is Low level effective, three inputs become high level with door 303 output, and this signal resets rest-set flip-flop 301, make the control signal Dischr that releases that its Q output exports become low level, terminate to release。
The control module of releasing of the multilevel voltage output switch power source changer of this utility model embodiment, by controlling discharge voltage, so switching power converters without adding fictitious load in sampling network module, greatly reduces the waste of the energy；Also can send the control signal Dischr to PWM that releases and control module 101; in order to shield PWM control module 101 because of feedback voltage instantaneous rising the output over-voltage protection signal of false triggering; can so that not starting time the machine-processed voltage caused when the circuit structure of sampling network module changes of overvoltage protection is elevated pieces of; only start when other overtension, improve stability, reliability and safety that switching power converters 100 uses。Module of releasing can Self Adaptive Control, it is not necessary to presets and releases the time, has significantly high adaptability and motility。
With reference to Fig. 5, this utility model embodiment proposes a kind of multilevel voltage output switch power source changer, and including power switch pipe 104, PWM controls module 101, releasing controls module 201, voltage request module 102, sampling network module, release switching tube 202 and voltage change-over switch pipe 103；Described voltage request module 102 receives external voltage request signal Vreq, and this voltage request signal Vreq is converted to voltage switching control signal VO_SWRelease described in being sent to and control module 201；The described voltage switching control signal V described in control module 201 delay process that releasesO_SW, and generate switch controlled signal VO_UPSend to described voltage change-over switch pipe 103, to control the circuit structure of sampling network module；And according to described voltage switching control signal VO_SWGeneration is released control signal Dischr; and the control signal Dischr that will release is respectively sent to release switching tube 202 and PWM control module 101; to control to release the duty of switching tube 202, and shielding PWM control module 101 because of feedback voltage instantaneous rising the overvoltage protection signal of false triggering；Described PWM controls the driving modulation signal Drv that module 101 receives the feedback voltage generation correspondence of described sampling network module, controls the duty of described power switch pipe 104；And driving is modulated signal Drv send to described in release control module 201, the control module 201 that makes to release carries out replacement and releases control signal Dischr。
In the present embodiment, above-mentioned sampling network module consists of first resistance the 107, second resistance 108 and the 3rd resistance 109, the circuit structure of sampling network module is controlled by the on an off of voltage change-over switch pipe 103, such as during switching power converters 100 normal operation, release and control the switch controlled signal V of module 201 outputO_UPFor low level, voltage change-over switch pipe 103 ends, and now the 3rd resistance 109 branch road disconnects, and the circuit of sampling network module is only connected by the first resistance 107 and the second resistance 108, and output voltage is standard charge voltage。As the switch controlled signal V controlling module 201 output that releasesO_UPFor high level, voltage change-over switch pipe 103 turns on, now the 3rd resistance 109 branch road conducting, and the circuit structure of sampling network module is that the second resistance 108 is in parallel with the 3rd resistance 109, and sampling ratio changes, and output voltage rises, it is achieved high voltage exports。
With reference to Fig. 2, in the present embodiment, above-mentioned pressure control module includes delay circuit 10, leadage circuit 20 and reset circuit 30；Above-mentioned delay circuit 10 receives the switch-over control signal of voltage request module 102, and become to control the open/close switch controlled signal of voltage change-over switch pipe 103 by switch-over control signal delay process, to control the circuit structure of the sampling network module of described pass supply convertor；Above-mentioned leadage circuit 20 receives switch-over control signal; control signal of releasing is generated according to switch-over control signal; and control signal of releasing is respectively sent to release switching tube 202 and the PWM control module 101 of described switching power converters; to control the output electricity of switching power converters, and shielding PWM control module 101 because of feedback voltage instantaneous rising the output over-voltage protection signal of false triggering；Above-mentioned reset circuit 30 receives PWM and controls the driving modulation signal that module 101 generates, and modulates, according to this driving, control signal of releasing described in signal replacement。
In the present embodiment, voltage request signal is converted to after voltage switching control signal is sent to switching power converters by voltage request module 102, by the time delay buffer 304 of delay circuit 10, its delay process is obtained switch controlled signal, this switch controlled signal is identical with voltage switching control signal, the time simply sent out is delayed, for high level signal；When delay process voltage switching control signal, leadage circuit generates, according to voltage switching control signal, control signal of releasing, it is respectively sent to release switching tube 202 and the PWM control module 101 of described switching power converters, above-mentioned control signal of releasing becomes high level when the trailing edge of voltage switching control signal, now, switching tube 202 of releasing controls the voltage output of switching power converters and releases, PWM controls the overvoltage protection signal in module 101 and is released control signal shielding, voltage change-over switch pipe 103 is made to turn off when voltage switching control signal generates and sends voltage change-over switch pipe 103, the circuit structure of sampling network module changes, raise consequently, it is possible to cause PWM to control the voltage in module 101, now owing to overvoltage protection signal is shielded, so overvoltage protection mechanism will not be triggered。Then PWM controls module 101 and starts generation driving modulation signal control power switch pipe work; first drive control signal that the module 101 of PWM control simultaneously produces sends to reset circuit 30; replacement is released control signal by reset circuit 30; the switching tube 202 that makes to release turns off; stopping is released; stop the shielding to overvoltage protection signal simultaneously, make the PWM output over-voltage protection mechanism controlling module 101 recover normal。
In the present embodiment, above-mentioned leadage circuit 20 includes monopulse generator 305 and rest-set flip-flop 301；The switch-over control signal receiving described voltage request module of monopulse generator 305, and convert switch-over control signal to positive pulse signal；Rest-set flip-flop 301 described positive pulse signal is converted to control signal of releasing be sent to described in release switching tube 202 and PWM control module 101。When the level rising edge of voltage switching control signal and when keeping high and low level, the output of above-mentioned monopulse generator 305 remains low level；After voltage switching control signal trailing edge arrival that and if only if, above-mentioned monopulse generator 305 exports the positive pulse signal V of a fixing durationO_DWN, output subsequently returns to low level, positive pulse signal VO_DWNProduce single direct impulse and be input to the S input of rest-set flip-flop 301 so that it is the control signal Dischr that releases of Q output output becomes high level。
In the present embodiment, above-mentioned reset circuit 30 includes three inputs and door the 303, first phase inverter the 306, second phase inverter 302 and described rest-set flip-flop 301；Described first phase inverter 306 receives described PWM and controls the driving modulation signal of module 101, and is sent to three inputs and door 303 after it is carried out anti-phase process；Described second phase inverter 302 receives the positive pulse signal that described monopulse generator 305 generates, and sends after being carried out anti-phase process to three inputs and doors 303, the driving of anti-phase process is modulated signal and carries out blanking；Described three inputs and door 303 are released control signal described in receiving, to control the on an off of this three input and door 303, when three inputs and door 303 are opened, the driving modulation signal of anti-phase process is sent extremely described rest-set flip-flop 301 with door 303 and resets control signal of releasing by three inputs。In the present embodiment, three inputs and door 303 receive the positive pulse signal V driving modulation signal and anti-phase process of anti-phase process respectivelyO_DWN, the positive pulse signal V of anti-phase processO_DWNThe driving modulation signal of anti-phase process is carried out elimination of hidden, when the control signal Dischr that releases becomes high level, three inputs unlock with door 303 and turn on, when the driving modulation signal Drv that PWM control module 101 sends is low level, three inputs export high level signal with door 303, this high level signal resets rest-set flip-flop 301 so that it is the Q output signal control signal Dischr that releases becomes low level, makes switching power converters terminate the process of releasing。
With reference to Fig. 3, in the present embodiment, above-mentioned control module 201 of releasing includes the input of rest-set flip-flop the 301, second phase inverter the 302, first phase inverter 306, three and door 303, time delay buffer 304, monopulse generator 305；First external input terminals the 311, second external input terminals 312, the first outside outfan 313 and the second outside outfan 314；The input of described time delay buffer 304 connects described voltage request module 102 by described first external input terminals 311, and outfan connects described voltage change-over switch pipe 103 by the described first outside outfan 313；The input of described monopulse generator 305 connects described voltage request module 102 by described first external input terminals 311, and outfan connects the input of the second phase inverter 302 and the S input of rest-set flip-flop 301 respectively；Described three inputs are connected the outfan of described second phase inverter 302 with the first input end of door 303, second input connects the outfan of described first phase inverter 306, the input of the first phase inverter 306 connects described PWM by the second input and controls the outfan of module 101, and the 3rd input connects the Q output of described rest-set flip-flop 301；Outfan connects the R input of described rest-set flip-flop 301；The Q output of described rest-set flip-flop 301 by described second outside outfan 314 connect described in release switching tube 202 and PWM controls module 101。The control module 201 of releasing of the present embodiment, simple in construction, with low cost, its circuit can also be used in other embodiments, release require as long as being capable of control。Above-mentioned monopulse generator 305 can adopt RC discharge and recharge circuit to realize, it is possible to adopts digital circuit enumerator to realize。
With reference to Fig. 4, in the present embodiment, when described switching power converters 100 works, above-mentioned time delay buffer 304 receives voltage switching control signal V by the first external input terminals 311O_SW, after buffering time delay, obtain switch controlled signal VO_UP, and export through the first outside outfan 313；The voltage switching control signal V that described pulse generation module receivesO_SWRising edge and when keeping high and low level, its output remains low level；And if only if voltage switching control signal VO_SWAfter trailing edge arrives, the direct impulse signal of one fixing duration of output, output subsequently returns to low level；As described voltage switching control signal VO_SWTrailing edge when arriving, direct impulse signal produces single direct impulse and is input to the S input of described rest-set flip-flop 301 so that it is the control signal Dischr that releases of Q output output becomes high level；Meanwhile, single direct impulse signal is after the second phase inverter 302 is anti-phase, as lead-edge-blanking signal, drives modulation signal Drv to carry out blanking when state switches to described；After the described control signal Dischr that releases becomes high level, three inputs unlock with door 303, wait that described driving modulates signal Drv, when first switching signal driving modulation signal Drv arrives, noticing that driving modulation signal Drv is Low level effective, three inputs become high level with door 303 output, and this signal resets rest-set flip-flop 301, make the control signal Dischr that releases that its Q output exports become low level, terminate to release。
The multilevel voltage output switch power source changer 100 of this utility model embodiment, by releasing, control module 201 controls output voltage, so without adding fictitious load in sampling network module, greatly reducing the waste of the energy；Control module 201 of releasing also can send the control signal Dischr to PWM that releases and control module 101; in order to shield PWM control module 101 because of feedback voltage instantaneous rising the output over-voltage protection signal of false triggering; can so that not starting time the machine-processed voltage caused when the circuit structure of sampling network module changes of overvoltage protection is elevated pieces of; only start when other overtension, improve stability, reliability and safety that switching power converters 100 uses；Module of releasing can Self Adaptive Control, it is not necessary to presets and releases the time, has significantly high adaptability and motility。
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure utilizing this utility model description and accompanying drawing content to make or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, all in like manner include in scope of patent protection of the present utility model。
Claims (6)
1. the pressure control module of a multilevel voltage output switch power source changer, it is characterised in that include delay circuit, leadage circuit and reset circuit；
Described delay circuit receives the switch-over control signal of voltage request module, and becomes to control the open/close switch controlled signal of voltage change-over switch pipe by switch-over control signal delay process, to control the circuit structure of the sampling network module of described pass supply convertor；
Described leadage circuit receives switch-over control signal; control signal of releasing is generated according to switch-over control signal; and control signal of releasing is respectively sent to release switching tube and the PWM control module of described switching power converters; to control the output electricity of switching power converters, and shielding PWM control module because of feedback voltage instantaneous rising the overvoltage protection signal of false triggering；
Described reset circuit reception PWM controls the driving modulation signal that module generates, and modulates, according to this driving, control signal of releasing described in signal replacement。
2. the pressure control module of multilevel voltage output switch power source changer according to claim 1, it is characterised in that described delay circuit includes time delay buffer,
The input of described time delay buffer connects described voltage request module, and outfan connects described voltage change-over switch pipe。
3. the pressure control module of multilevel voltage output switch power source changer according to claim 1, it is characterised in that described leadage circuit includes monopulse generator and rest-set flip-flop；
The switch-over control signal receiving described voltage request module of described monopulse generator, and convert switch-over control signal to positive pulse signal；
Described rest-set flip-flop described positive pulse signal is converted to control signal of releasing be sent to described in release switching tube and PWM control module。
4. the pressure control module of multilevel voltage output switch power source changer according to claim 3, it is characterised in that described reset circuit includes three inputs and door, the first phase inverter, the second phase inverter and described rest-set flip-flop；
Described first phase inverter receives described PWM and controls the driving modulation signal of module, and is sent to three inputs and door after it is carried out anti-phase process；
Described second phase inverter receives the positive pulse signal that described monopulse generator generates, and sends after being carried out anti-phase process to three input and doors, the driving of anti-phase process is modulated signal and carries out blanking；
Described three inputs and door are released control signal described in receiving, and to control the on an off of this three input and door, when three inputs are opened with door, the drivings modulation signals of three inputs and the anti-phase process of goalkeeper send to described rest-set flip-flop and reset control signal of releasing。
5. a multilevel voltage output switch power source changer, it is characterised in that include voltage request module, control module of releasing, voltage change-over switch pipe, sampling network module, switching tube of releasing, PWM control module and power switch pipe；
Described voltage request module receives external voltage request signal, and this voltage request signal is converted to voltage switching control signal be sent to described in release control module；
Described voltage switching control signal described in control module delay process of releasing, and generate the transmission of switch controlled signal to described voltage change-over switch pipe, to control the circuit structure of sampling network module；And generate, according to described voltage switching control signal, control signal of releasing; and control signal of releasing is respectively sent to release switching tube and PWM control module; to control to release the duty of switching tube, and shielding PWM control module because of feedback voltage instantaneous rising the overvoltage protection signal of false triggering；
Described PWM controls the driving modulation signal that module receives the feedback voltage generation correspondence of described sampling network module, controls the duty of described power switch pipe；And driving is modulated signal send to described in release control module, the control module that makes to release carries out replacement and releases control signal。
6. multilevel voltage output switch power source changer according to claim 5, it is characterised in that described in release and control control module of releasing according to any one of module such as Claims 1-4。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515372A (en) * | 2016-01-27 | 2016-04-20 | 深圳市瑞之辰科技有限公司 | Multistage voltage output switch power converter and pressure relief control method and module thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515372A (en) * | 2016-01-27 | 2016-04-20 | 深圳市瑞之辰科技有限公司 | Multistage voltage output switch power converter and pressure relief control method and module thereof |
| CN105515372B (en) * | 2016-01-27 | 2019-09-27 | 深圳市瑞之辰科技有限公司 | Multilevel voltage output switch power source converter and its pressure release control method and module |
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