CN102447390A - Multiphase control system and control units - Google Patents
Multiphase control system and control units Download PDFInfo
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- CN102447390A CN102447390A CN 201010512325 CN201010512325A CN102447390A CN 102447390 A CN102447390 A CN 102447390A CN 201010512325 CN201010512325 CN 201010512325 CN 201010512325 A CN201010512325 A CN 201010512325A CN 102447390 A CN102447390 A CN 102447390A
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Abstract
The invention provides a multiphase control system and control units, which are used for converting electrical power of an input power supply into an output voltage to be output through an output end. The multiphase control system comprises a plurality of the control units, wherein, the control units are coupled in series to form a turning circle; and after receiving a sequential input signal from a previous neighboring control unit through a multiphase input end, each control unit generates a control signal so as to control the electrical power of the input power supply to be transmitted to the output end and meanwhile generates a sequential output signal and transmits the signal to a next neighboring control unit through the multiphase output end when the output voltage is judged to be lower than a preset voltage value.
Description
Technical field
The present invention relates to a kind of heterogeneous control system and control unit, particularly a kind of heterogeneous control system and control unit that operates with the control unit mode that is series at after preceding control unit triggering is series at.
Background technology
Electronic component now, for example: central processing unit, memory body etc., its driving voltage descends gradually, can reduce for the permission scope of voltage ripple (Voltage Ripple) thereupon.Yet the power consumption of electronic component is failed the decline of amplitudes such as having simultaneously, cause the required electric current of operation to rise on the contrary, and bigger electric current can cause bigger voltage ripple on the contrary.In order to address the above problem, develop and heterogeneous change-over circuit framework, make electric current disperse to provide by a plurality of change-over circuits.Compared to single-phase change-over circuit framework, heterogeneous change-over circuit framework is performance excellence in the elimination of voltage ripple not only, also all has preferable advantage at aspects such as dynamic response, the elimination of output ripple electric current, heat radiations in addition.
See also Fig. 1, be the circuit diagram of existing DC-to-DC switching circuit, comprised a controller 10 and three passage 12a～12c.Each passage 12a～12c comprises two transistor switches and is serially connected between input voltage vin and the ground connection.Driver in each passage 12a～12c receives the PWM signal PWM1～PWM3 of self-controller 10 separately, to switch corresponding transistor switch in view of the above, so that channel current Io1～Io3 to be provided.Channel current Io1～Io3 combines and forms output current Io to the capacitor C charging and produce output voltage V out, to drive load Load.Controller 10 through the pin position to CSP1 and CSN1, CSP2 and CSN2, CSP3 and CSN3 detection channel electric current I o1～Io3 and receive a feedback signal FB, work period of the transistor switch among modulated channel 12a～12c according to this.
Summary of the invention
Seeing that the circuit complexity and the cost of DC-to-DC switching circuit of the prior art are higher, be subject to the specifications design of the controller that carries out heterogeneous control, port number can't cooperate different application environments and adjust.The mode that the present invention triggers through the control unit in each passage in regular turn; Circuit complexity and cost have been simplified; And port number can be through port number itself many or few adjustment of series connection, the use good springiness, and also have ripple is controlled at the advantage in the preset range.
For reaching above-mentioned purpose, the invention provides a kind of heterogeneous control system, become an output voltage to export in order to power conversions in an output with an input power supply.Above-mentioned heterogeneous control system comprises a plurality of control units; These control units couple and form a loop with series system; Wherein each control unit is after a heterogeneous input receives the order input signal from the control unit before being adjacent to; When judging that output voltage is lower than one first magnitude of voltage, produce control signal in order to the power delivery of control input power supply to output, and produce an order in a heterogeneous output and output signal to the control unit after being adjacent to.
The present invention also provides a kind of control unit, is used for the corresponding change-over circuit of a heterogeneous change-over circuit control, makes heterogeneous change-over circuit in system's output a stable output voltage is provided.Control unit comprises a heterogeneous input circuit, a feedback control circuit and a heterogeneous output circuit.Heterogeneous input circuit produces a FEEDBACK CONTROL enabling signal when receiving an order input signal.Feedback control circuit produces at least one control signal and transmits electric power to system output to control corresponding change-over circuit receiving when FEEDBACK CONTROL enabling signal and output voltage are lower than one first magnitude of voltage.Heterogeneous output circuit receives at least one control signal and exports signal to produce an order.
Above general introduction and ensuing detailed description are exemplary in nature, are in order to further specify claim of the present invention.And about other purposes of the present invention and advantage, will set forth in follow-up explanation and diagram.
Description of drawings
Fig. 1 is the circuit diagram of existing DC-to-DC switching circuit.
Fig. 2 is the circuit diagram according to heterogeneous change-over circuit of the present invention.
Fig. 3 is the circuit diagram of the control unit of first embodiment one of according to the present invention.
Fig. 4 is the circuit diagram of the control unit of second embodiment one of according to the present invention.
Fig. 5 is the circuit diagram of the control unit of the 3rd embodiment one of according to the present invention.
Reference numeral:
Vin, PWM1～PWM3-input
The 10-controller; 12a～12c-passage;
Press;
Io1～Io3-channel current; The Io-output current; C-electric capacity;
CSP1、CSN1、CSP2、CSN2、
The Vout-output voltage; The Load-load;
CSP3, CSN3-pin position;
101,102,103, the logical 100a～104a of 104-, 200a, 300a-
The FB-feedback signal;
The road; Control unit;
100b～104b, 200b, 110,210,310-FEEDBACK CONTROL 111,112,121,143,211,
The 300b-converting unit; Circuit; 271,311,381-comparator;
114、131、142、314-SR
113,213,313-and door; 115,215,315-drive circuit;
The type latch;
117、132、145、384-
118-is by the shortest time circuit; 119-current limliting signal;
Or door;
120,220,320-master control 130,230, the heterogeneous input of 330-
The 122-one shots;
Initialization circuit; The road;
133,233,333-feedback control 140,240, the heterogeneous output of 340-
141-lower edge circuits for triggering;
The system enabling signal; Circuit;
144-upper limb circuits for triggering; 150,250,350-protective circuit; 160,260,360-bypass resistance;
161,261, fixedly ON time generation of 361-bypass letter 216-
Bypass decision circuitry under the 270-;
Number; Circuit;
316-is accurate, and fixedly ON time produces
Bypass output circuit under the 272-; The last bypass decision circuitry of 380-;
Give birth to circuit;
The last bypass output circuit of 382-; The 383-counter; The Vcc-driving voltage;
Vi-imports power supply; The Vo-output voltage; The RL-load;
The Co-output capacitance; The heterogeneous input of Pi-; The heterogeneous output of Po-;
The MS-primary and secondary is set end; The FB-feedback end; The CS-current sense terminal;
S1, S2-control end; The FS-main control signal; The Fb-feedback signal;
PH1～PH4-sequential signal; Vpor-primary and secondary reference potential; S-sets end;
The Q-output; The R end of resetting; PHi-order input signal;
PHo-exports signal in proper order; Vr1-first voltage reference value; Vr2-second voltage reference value;
Vr3-tertiary voltage reference value; Vr4-the 4th voltage reference value; Vr5-the 5th voltage reference value;
Sq-conducting control signal; S1-first control signal; S2-second control signal;
SW1-the first transistor switch; SW2-transistor seconds switch; L, L1, L2-inductance;
The CS-current sense terminal; The PROT-guard signal; Por-control unit normal signal;
Bypass output signal under the dbo-; Bypass output under the DBo-; Bypass input under the DBi-;
Bypass input signal under the dbi-; Cs-current sense signal; The ont-ON time is to signal
The IL-inductive current; The last bypass output of Ubo-signal; The last bypass output of UBo-.
Embodiment
See also Fig. 2, be circuit diagram, be used for becoming an output voltage V o to export the power conversions of an input power supply Vi, to provide load RL operation required electric power in output according to heterogeneous change-over circuit of the present invention.Heterogeneous change-over circuit comprises plurality of channels, is that the DC-DC decompression converting circuit is the example explanation at present embodiment with four path 10s 1,102,103,104 and passage.Each path 10 1～104 each a self-contained control unit 101a～104a and converting unit 101b～104b, converting unit 101b～104b is coupled to output capacitance Co.Control unit 101a～104a can produce control signal, makes corresponding converting unit 101b～104b will transmit output capacitance Co from the electric power of input power supply Vi to produce stable output voltage V o, to provide load RL operation required.
Control unit 101a～104a couples and forms a loop to form the heterogeneous control system of heterogeneous change-over circuit with series system.In the present embodiment, each converting unit 101b～104b comprises heterogeneous input Pi, heterogeneous output Po, primary and secondary setting end MS, feedback end FB, current sense terminal CS and control end S1, S2.The operating instruction of heterogeneous control system is following:
The primary and secondary of first control unit 101a is set end MS and is received a main control signal FS at primary and secondary setting end MS, makes first control unit 101a be set to main control unit.The effect of main control unit is the control unit of first running after the system start-up, starts heterogeneous control loop.Therefore, after the system start-up, first control unit 101a judges according to a feedback signal fb who represents output voltage V o whether output voltage V o is lower than a predetermined magnitude of voltage.When output voltage V o is lower than predetermined magnitude of voltage; First control unit 101a produces control signal at control end S1, S2 makes the electric power of the transistor switch transmission input power supply Vi among the converting unit 101b to output output voltage V o risen, and produces PH1 to the second control unit 102a of first sequential signal at heterogeneous output Po simultaneously.Second control unit 102a judges according to feedback signal fb whether output voltage V o is lower than predetermined magnitude of voltage after receiving first sequential signal PH1 that first control unit 101a produced by heterogeneous input Pi.When output voltage V o is lower than predetermined magnitude of voltage; Then second control unit 102a makes electric power to the output of the transistor switch transmission input power supply Vi among the converting unit 102b that output voltage V o is risen in control end S1, S2 generation control signal, and simultaneously at three control unit 103a of heterogeneous output Po second sequential signal PH2 to the of generation.The 3rd control unit 103a judges according to feedback signal fb whether output voltage V o is lower than predetermined magnitude of voltage after receiving second sequential signal PH2 that second control unit 102a produced by heterogeneous input Pi.When output voltage V o is lower than predetermined magnitude of voltage; Then the 3rd control unit 103a makes electric power to the output of the transistor switch transmission input power supply Vi among the converting unit 103b that output voltage V o is risen in control end S1, S2 generation control signal, and produces four control unit 104a of the 3rd sequential signal PH3 to the at heterogeneous output Po simultaneously.The 4th control unit 104a judges according to feedback signal fb whether output voltage V o is lower than predetermined magnitude of voltage after receiving the 3rd the sequential signal PH3 that the 3rd control unit 103a produced by heterogeneous input Pi.When output voltage V o is lower than predetermined magnitude of voltage; Then the 4th control unit 104a makes electric power to the output of the transistor switch transmission input power supply Vi among the converting unit 104b that output voltage V o is risen in control end S1, S2 generation control signal, and produces the 4th sequential signal PH4 to first control unit 101a at heterogeneous output Po simultaneously.So form a heterogeneous control loop, so that stable output voltage V o to be provided.
Next, Fig. 3 is the circuit diagram of the control unit of first embodiment one of according to the present invention, is to be used for the corresponding change-over circuit 100b of a heterogeneous control system control, makes this heterogeneous control system at system's output a stable output voltage is provided.Control unit 100a comprises the heterogeneous output circuit of the heterogeneous input circuit of a feedback control circuit 110, a master control initialization circuit 120, one 130, one 140, a protective circuit 150 and a bypass resistance 160.Master control initialization circuit 120 is set end MS according to primary and secondary and is judged whether control unit 100a is the main control unit as heterogeneous control loop, comprises a comparator 121 and an one shots 122.In the present embodiment; The driving voltage vcc that primary and secondary setting end MS can connect control unit 100a is as main control signal; Comparator 121 judgement primary and secondarys were set and were held the current potential of MS to be higher than primary and secondary reference potential Vpor this moment; And produce a high level signal, and make one shots 122 produce a pulse signal, this moment, control unit 100a was set to main control unit.As if when primary and secondary setting end MS is suspension joint or ground connection, the current potential that primary and secondary is set end MS can be lower than primary and secondary reference potential Vpor, makes control unit 100a be set to the inferior unit of controlling.
Heterogeneous input circuit 130 comprises a SR type latch (SR Latch) 131 and one or door 132, judges whether to take turns to control unit 100a according to the signal of heterogeneous input Pi and carries out FEEDBACK CONTROL.Or output and heterogeneous input that door 132 receives master control initialization circuits 120 are to produce the setting end S of signal to SR type latch.When the setting end S of SR type latch was triggered, FEEDBACK CONTROL enabling signal 133 to the feedback control circuit 110 of exporting high level at output Q was to start FEEDBACK CONTROL.Therefore, if control unit 100a is set to main control unit, then at the beginning of the system start-up, the master control initialization circuit 120 among the control unit 100a can trigger heterogeneous input circuit 130 and produce FEEDBACK CONTROL enabling signal 133.If control unit 100a is set to time the control unit, then the order of the control unit before abutting against output signal is sent to heterogeneous input Pi when becoming order input signal PHi, and heterogeneous input circuit 130 just produces high level signal 133.
Feedback control circuit 110 comprise one first comparator 111, one second comparator 112, one and door 113, one SR type latch 114, one drive circuit 115, one or door 117 and by shortest time circuit 118, carry out FEEDBACK CONTROL according to FEEDBACK CONTROL enabling signal 133 and feedback signal fb.The end of oppisite phase of first comparator 111 couples feedback end FB with receiving feedback signals fb; Non-oppisite phase end receives the first voltage reference value Vr1; When feedback signal fb is lower than the first voltage reference value Vr1; Promptly represent output voltage V o to be lower than first magnitude of voltage, first comparator 111 output high level signals to door 113.Couple the heterogeneous input circuit 130 and first comparator 111 with door 113, when the output signal of first comparator 111 and heterogeneous input circuit 130 is high level simultaneously, just trigger the conducting control signal sq of SR type latch 114 output high level.When drive circuit 115 receives the conducting control signal sq of high level; Export the first control signal s1 with the first transistor switch SW 1 conducting among the control transformation circuit 100b through control end S1; The electric power that makes input power supply Vi is passed to the output (not drawing) of heterogeneous change-over circuit through the first transistor switch and inductance L, and output voltage is risen.Be couple to the replacement end R of the SR type latch 131 in the heterogeneous input circuit 130 simultaneously with the output of door 113; When therefore SR type latch 114 was exported the conducting control signal sq of high level, replacement SR type latch 131 made FEEDBACK CONTROL enabling signal 133 transfer low level to wait for the triggering of order input signal PHi next time.
The non-oppisite phase end of second comparator 112 couples feedback end FB with receiving feedback signals fb, and end of oppisite phase receives one second voltage reference value Vr2.When the output voltage rising makes feedback signal fb be higher than the second voltage reference value Vr2; Promptly represent output voltage V o to be higher than one second magnitude of voltage; Wherein second magnitude of voltage is higher than first magnitude of voltage; Second comparator 112 output, one high level signal to or door 117 with replacement SR type latch 114, make conducting control signal sq transfer low level signal to.When drive circuit 115 receives low level conducting control signal sq, export the second control signal s2 with transistor seconds switch SW 2 conductings among the control transformation circuit 100b through control end S2, and simultaneously by the first transistor switch SW 1.At this moment, the electric current of inductance L is through 2 afterflows of transistor seconds switch SW.Whether drive circuit 115 is reduced to zero simultaneously through current sense terminal CS received current detection signal cs with the electric current of judging inductance L.If then transistor seconds switch SW 2 is ended to avoid the electric current adverse current.
In addition, drive circuit 115 judges simultaneously also whether the electric current of inductance L surpasses a predetermined lowest high-current value.If; Then produce a current limliting signal 119 to or the door 117; The replacement end R of this moment or door 117 output high level signal to SR type latchs 114 is with replacement SR type latch 114; Make conducting control signal sq transfer low level to, drive circuit 115 stop conducting the first transistor switch SW 1 and conducting transistor seconds switch SW 2.Above-mentioned current limit by inductance is for avoiding inductive current excessive (for example: in overload or system when just having started) to cause inductance L saturated.
By shortest time circuit 118 couple or door 117 output and with door 113.By shortest time circuit 118 preset be output as high level signal to door 113; And when receive or the door 117 exported high level signal the time; Produce a low level signal and continue a predetermined cutting back and end time span, make the conducting control signal sq of this moment continue predetermined cutting back end time span be maintained at low level and inductance L is had release can time.In heterogeneous control, do not have effect in principle by shortest time circuit 118.But heterogeneous input Pi and the heterogeneous output Po of control unit 100a of the present invention can be connected to become single-phase FEEDBACK CONTROL, and can guarantee that by the setting of shortest time circuit 118 inductance L has the time of the ability released this moment.
Heterogeneous output circuit 140 comprise lower edge circuits for triggering 141, a SR type latch 142, a comparator 143, upper limb circuits for triggering 144 and or door 145; Be used for control unit 100a control transformation circuit 100b and transmit electric power behind output, signal PHo is exported in output in proper order.Lower edge circuits for triggering 141 receive the conducting control signal sq of feedback control circuit 110; When conducting control signal sq transfers low level to by high level; Produce high level signal and trigger SR type latch 142; Make the order output signal PHo of SR type latch 142, be adjacent to control unit 100a control unit afterwards with triggering and carry out FEEDBACK CONTROL at output Q output high level.The order output signal PRo of high level can start upper limb circuits for triggering 144 simultaneously.Because the control unit after being adjacent to is at the order output signal PHo that receives control unit 100a and detect output voltage V o when being lower than first magnitude of voltage; The electric power of the change-over circuit transmission input power supply Vi that meeting control is corresponding is the output of phase transformation circuit at the most, makes output voltage V o rise.The non-oppisite phase end receiving feedback signals fb of comparator 143 and end of oppisite phase receives one the 5th voltage reference value Vr5.Control unit after being adjacent to control unit 100a gos up when extremely surpassing one the 5th magnitude of voltage output voltage V o, comparator 143 meeting output high level signals, and wherein the 5th magnitude of voltage is higher than first magnitude of voltage.At this moment; Upper limb circuits for triggering 144 meeting replacement SR type latchs 142; Make order export signal PHo and transfer low level to; Make the control unit that is adjacent to after the control unit 100a when output voltage V o is lower than first magnitude of voltage once again, not carry out FEEDBACK CONTROL, and carry out FEEDBACK CONTROL by Next control unit again.
Protective circuit 150 receiving feedback signals fb with judge output voltage V o whether too high or too low (for example: surpass predetermined voltage 125% or be lower than predetermined voltage 70%); If; Then carry out protected mode and export a guard signal PROT making control unit 100a shut-down operation, and bypass resistance is started.
Bypass resistance 160 couples heterogeneous output circuit 140, is used for that control unit 100a can't produce control signal or when unusual, the order input signal PHi that will be received by the heterogeneous input Pi of control unit 100a is sent to should exporting by heterogeneous output of this control unit.Bypass resistance 160 receives a control unit normal signal por, and control unit normal signal por can produce or imported by the outside by control unit 100a is inner.When control unit 100a normal operation, control unit normal signal por is a low level signal, and bypass resistance does not act on for 160 this moments.And work as control unit normal signal por is high level, represents control unit 100a to be in bypass mode, and this moment, bypass signal 161 to protective circuit 150 and heterogeneous output circuits 140 were exported in bypass resistance 160 startups.When protective circuit 150 received tie point signal 161, output protection signal PROT made control unit 100a stop FEEDBACK CONTROL.Perhaps when protective circuit 150 output protection signal PROT, bypass resistance 160 receives guard signal PROT and starts bypass mode, to avoid the influence of control unit 100a abnormal operation.And heterogeneous output circuit 140 or door 145 when receiving bypass signal 161, trigger the order output signal PHo of SR type latch 142 output high level.In addition; For avoiding control unit 100a when some circuit abnormality states; Heterogeneous output circuit 140 can't normal operation, and bypass resistance 160 also can directly output to heterogeneous output Po with order input signal PHi and export signal PHo as order, for example: can pass through a transistor; The source electrode drain couples heterogeneous input Po, heterogeneous output Po respectively, and gate pole reception control unit normal signal por reaches.
Then seeing also Fig. 4, is the circuit diagram of the control unit of second embodiment one of according to the present invention.Control unit 200a comprises the heterogeneous output circuit of the heterogeneous input circuit of a feedback control circuit 210, a master control initialization circuit 220, one 230, one 240, a protective circuit 250, a bypass resistance 260 and bypass decision circuitry 270 once, is used for the corresponding change-over circuit 200b of a heterogeneous control system control.Wherein, Master control initialization circuit 220, heterogeneous input circuit 230, heterogeneous output circuit 240, protective circuit 250 is similar with the running of master control initialization circuit 120, heterogeneous input circuit 130, heterogeneous output circuit 140 and protective circuit 150 shown in Figure 3, states so no longer tire out at this.
In the present embodiment, feedback control circuit 210 is a fixing ON time control circuit, comprises one first comparator 211, one and the fixing ON time generation circuit 216 of door 213, one drive circuit 215 and.When feedback signal fb is lower than the first voltage reference value Vr1, first comparator 211 output high level signals to door 213.If heterogeneous input circuit 230 also received order input signal PHi (representative takes turns to control unit 200a and carries out FEEDBACK CONTROL) and produced high level FEEDBACK CONTROL enabling signal 233 to door 213 time this moment; Trigger fixedly ON time generation circuit 216 with door 213, produce the conducting control signal sq of a set time length.Therefore, drive circuit 215 is the above-mentioned set time length of conducting the first transistor switch SW 1 also, make electric power that change-over circuit 200b transmits out-put supply Vi at the most the time span of the output of phase transformation circuit fix.
Following bypass decision circuitry 270 comprises a comparator 271 and bypass output circuit 272 once, is used for judging whether the control unit that is adjacent to after the control unit 200a continues smoothly carries out FEEDBACK CONTROL.Following bypass output circuit 272 couples heterogeneous output circuit 240, when order is exported signal PHo for high level, starts.The end of oppisite phase receiving feedback signals fb of comparator 271 and non-oppisite phase end receives a tertiary voltage reference value Vr3; Wherein tertiary voltage reference value Vr3 is lower than the first reference voltage level Vr1, and for example: the preferable tertiary voltage reference value Vr3 that can set is 70% of the first reference voltage level Vr1.When feedback signal fb was lower than tertiary voltage reference value Vr3, comparator 271 output high level signals made down bypass output circuit 272 export the signal of bypass output dbo exports the control unit after being adjacent to through the output of the bypass once DBo of control unit 200a the input of bypass once.Just when exporting in proper order signal PHo when output, representative takes turns to the control unit that is adjacent to after the control unit 200a should be carried out FEEDBACK CONTROL and not carry out, and causes output voltage V o to drop to the tertiary voltage value, and promptly 70% of first magnitude of voltage.Control unit 200a sends down bypass output signal dbo immediately, and the bypass resistance in the control unit after being adjacent to is started, and will export signal PHo in proper order and pass to next control unit again, carries out FEEDBACK CONTROL by next control unit.
Compared to the embodiment of Fig. 3, bypass resistance 260 is through the following extra bypass input signal dbi that receives of bypass input DBi, promptly by being adjacent to the following bypass output signal dbo that control unit 200a control unit before produces.When bypass resistance 260 receives down bypass input signal dbi; Represent control unit 200a to occur output voltage V o is descended undeservedly; Bypass resistance 260 started when making the order input signal PHi that control unit 200a will receive output and exported signal PHo in proper order this moment, crossed control unit 200a and directly carried out FEEDBACK CONTROL so that be adjacent to control unit after the control unit 200a.
In addition, it should be noted that the inductance among the change-over circuit 200b can comprise the inductance of a plurality of series connection (representing with the inductance L 1 and the inductance L 2 of series connection among the 4th figure).Saturation current in the series inductance is different separately and when reaching different electric current, its equivalent inductance value is also different, makes change-over circuit that higher conversion efficiency arranged when underloading.
Coming Fig. 5 again is the circuit diagram of the control unit of the 3rd embodiment one of according to the present invention.Control unit 300a comprises bypass decision circuitry 380 on the heterogeneous output circuit of the heterogeneous input circuit of a feedback control circuit 310, a master control initialization circuit 320, one 330, one 340, a protective circuit 350, the bypass resistance 360 and, is used for the corresponding change-over circuit 300b of a heterogeneous control system control and makes the electric power of input power supply Vi be sent to output.Wherein, The running of master control initialization circuit 120, heterogeneous input circuit 130, heterogeneous output circuit 140 and the protective circuit 150 shown in master control initialization circuit 320, heterogeneous input circuit 330, heterogeneous output circuit 340, protective circuit 350 and the 3rd figure is similar, so this no longer tired stating.
In the present embodiment, feedback control circuit 310 is fixing ON time control circuit surely, comprises one first comparator 311, one and door 313, one SR type latch 314, one drive circuit 315 and fixing ON time generation circuit 316 surely.When feedback signal fb is lower than the first voltage reference value Vr1, first comparator 311 output high level signals to door 313.If heterogeneous input circuit 330 also received order input signal PHi (representative takes turns to control unit 300a and carries out FEEDBACK CONTROL) and produced high level FEEDBACK CONTROL enabling signal 333 to door 313 time this moment; Trigger SR type latch 314 with door 313, produce a conducting control signal sq.Therefore, drive circuit 315 conducting the first transistor switch SW 1.And accurate fixedly ON time produces circuit 316 reception conducting control signal sq, feedback signal fb and receives current sense signal cs, and the time length that when receiving conducting control signal sq, picks up counting, and wherein time span decides according to feedback signal fb.After receiving conducting control signal sq and the above-mentioned time length of process; Accurate fixedly ON time produce circuit 316 generations one ON time to signal ont with replacement SR type latch 314; Make conducting control signal sq transfer low level to; Make drive circuit 315 by the first transistor switch SW 1, the conducting second crystal switch SW2, the electric current I L that makes inductance L is through 2 afterflows of transistor seconds switch SW.And accurate fixedly ON time produces circuit 316 as if receiving conducting control signal sq but when not passing through above-mentioned time span as yet; According to current sense signal cs; Judge that electric current I L has reached a scheduled current upper limit, then can export immediately ON time to signal ont with replacement SR type latch 314.In addition, drive circuit 315 also received current detection signal cs and ends transistor seconds switch SW 2 when electric current I L is zero judging the size of electric current I L, to wait for the running of next cycle.
In the present embodiment, change-over circuit is the DC-DC decompression converting circuit, and when stable state, the ratio of its output voltage and input voltage and the relation of the work period of change-over circuit are VO/VI=D=Ton/ (Ton+Toff),
Wherein, VO is an output voltage values, and VI is an input voltage value, and D is the work period, and Ton is an ON time, and Toff is deadline.
Because feedback voltage fb is proportional to output voltage VO, therefore when ON time Ton is proportional to feedback voltage fb and VI and is fixed value for input voltage value VO, (Ton+Toff) be certain value, promptly frequency is a definite value.And under negative feedback control, feedback voltage fb is stabilized near the first voltage reference value Vr1, also can be considered certain value and reaches the accurate fixedly purpose of ON time so be proportional to the ON time Ton of feedback voltage fb.
Last bypass decision circuitry 380 comprises bypass output circuit 382 on the comparator 381,, a counter 383 and one or door 384, whether proceeds FEEDBACK CONTROL smoothly in order to the control unit that judgement is adjacent to before the control unit 300a.The end of oppisite phase receiving feedback signals fb of comparator 381 and non-oppisite phase end receives one the 4th voltage reference value Vr4; Wherein the 4th voltage reference value Vr4 is lower than the first reference voltage level Vr1, and for example: preferable the 4th voltage reference value Vr4 that can set is 70% of the first reference voltage level Vr1.When feedback signal fb is lower than the 4th voltage reference value Vr4; Comparator 381 output high level signals make down bypass output circuit 382 output high level signals, make or door 384 outputs one on bypass output signal ubo through control unit 300a one on bypass output UBo export to be adjacent to preceding control unit one on the bypass input.Just work as output voltage V o and drop to the 4th magnitude of voltage, promptly 70% of first magnitude of voltage o'clock, control unit 300a sent bypass output signal ubo immediately, and the bypass resistance in the control unit before being adjacent to is started.The order of the control unit reception before if abut against this moment input signal PHi; Then represent the not normal operation and cause output voltage low excessively of this control unit; Through starting the bypass resistance of this control unit; Make order input signal PHi directly be sent to control unit 300a, make control unit 300a carry out FEEDBACK CONTROL.
Can know that according to the above embodiments the present invention can be controlled in certain scope the ripple scope of output voltage V o through perhaps (standard) fixedly setting of ON time of setting of the first voltage reference value Vr1 and the second voltage reference value Vr2.In addition, through being connected into the heterogeneous control system of loop, the mode that trigger the front and back of the control unit through adjacency can make the number of phases of heterogeneous control system adjust along with actual demand, has simplified circuit complexity and cost, and preferable use elasticity is provided.And maybe arbitrary control unit circuit unusual and make the risk that maybe heterogeneous change-over circuit can't operate for the control unit that is connected into loop, the present invention utilizes bypass resistance to walk around the control unit of circuit abnormality, thereby can guarantee the circuit running.
As stated, the present invention meets patent three important documents fully: novelty, creativeness and practicality.The present invention discloses with preferred embodiment hereinbefore, but those skilled in the art will appreciate that this embodiment only is used to describe the present invention, and should not be read as restriction scope of the present invention.It should be noted,, all should be made as and be covered by in the category of the present invention such as with the variation and the displacement of this embodiment equivalence.Therefore, protection scope of the present invention is when being as the criterion with the scope that claim was defined.
Claims (21)
1. a heterogeneous control system becomes an output voltage to export in an output in order to the power conversions with an input power supply, it is characterized in that this heterogeneous control system comprises:
A plurality of control units; These control units couple and form a loop with series system; Wherein each control unit is after a heterogeneous input receives the order input signal from the control unit before being adjacent to; When judging that this output voltage is lower than one first magnitude of voltage, produce control signal in order to the power delivery of controlling this input power supply to this output, and produce one in a heterogeneous output and output signal to the control unit after being adjacent in proper order.
2. heterogeneous control system according to claim 1 is characterized in that, wherein each this control unit is a fixing ON time control unit, and the time span of power delivery to this output of this input power supply is fixed.
3. heterogeneous control system according to claim 1 is characterized in that, wherein each this control unit is higher than one second magnitude of voltage at this output voltage, and the power delivery that stops this input power supply is to this output, and this second magnitude of voltage is higher than this first magnitude of voltage.
4. heterogeneous control system according to claim 1; It is characterized in that; Wherein each this control unit comprises a bypass resistance; When being used for this control unit and can't producing control signal, this order input signal that will be received by this heterogeneous input of this control unit is sent to this heterogeneous output of this control unit and exports.
5. heterogeneous control system according to claim 1; It is characterized in that; Wherein each this control unit comprises a bypass resistance, is used for receiving this order input signal and this bypass resistance when starting when each this control unit, and this exports signal in proper order to make this heterogeneous output output.
6. heterogeneous control system according to claim 5; It is characterized in that; Wherein export signal in proper order and judge that this output voltage is lower than a tertiary voltage value and produces the signal of bypass output when each this control unit produces this; The bypass resistance of the control unit after being adjacent to is started, and wherein this tertiary voltage value is lower than this first magnitude of voltage.
7. heterogeneous control system according to claim 5; It is characterized in that; Wherein, each this control unit produces bypass output signal on a when this output voltage is lower than one the 4th magnitude of voltage when detecting; This bypass resistance of control unit before being adjacent to is started, and wherein the 4th magnitude of voltage is lower than this first magnitude of voltage.
8. heterogeneous control system according to claim 1 is characterized in that, wherein these a plurality of control units one of them be set to main control unit, first produces control signal and order is exported signal when being used for this heterogeneous control system and starting.
9. heterogeneous control system according to claim 1 is characterized in that, wherein each this control unit work period of deciding the control signal that is produced according to level and this input power source voltage level of this output voltage.
10. heterogeneous control system according to claim 1; It is characterized in that; Wherein each this control unit detects this output voltage after exporting signal in proper order when being higher than one the 5th magnitude of voltage once again producing this; Stop to produce this and export signal in proper order, wherein the 5th magnitude of voltage is higher than this first magnitude of voltage.
11. a control unit is used for the corresponding change-over circuit of a heterogeneous change-over circuit control, makes this heterogeneous change-over circuit in system's output a stable output voltage is provided, and it is characterized in that this control unit comprises:
One heterogeneous input circuit produces a FEEDBACK CONTROL enabling signal when receiving an order input signal;
One feedback control circuit produces at least one control signal and transmits electric power to this system's output to control corresponding change-over circuit receiving when FEEDBACK CONTROL enabling signal and this output voltage are lower than one first magnitude of voltage; And
One heterogeneous output circuit receives this at least one control signal and exports signal to produce an order.
12. control unit according to claim 11 is characterized in that, wherein this at least one control signal is fixing ON time signal, and the time length of corresponding change-over circuit transmission electric power is fixed.
13. control unit according to claim 11 is characterized in that, wherein this feedback control circuit also determines the work period of this at least one control signal according to this output voltage.
14. control unit according to claim 11 is characterized in that, wherein this feedback control circuit stops to produce this at least one control signal when this output voltage is higher than one second magnitude of voltage.
15. control unit according to claim 11 is characterized in that, also comprises a master control initialization circuit, when receiving a main control signal, produces this FEEDBACK CONTROL enabling signal.
16. control unit according to claim 11; It is characterized in that; Also comprise bypass decision circuitry; When this heterogeneous output circuit produces this and exports signal in proper order and this time bypass decision circuitry when judging that this output voltage is lower than a tertiary voltage value, this time bypass decision circuitry produces bypass and exports signal, and wherein this tertiary voltage value is lower than this first magnitude of voltage.
17. control unit according to claim 11 is characterized in that, wherein also comprises a bypass resistance, when this bypass resistance receives the bypass input signal and detects this order input signal, makes this control unit produce this and exports signal in proper order.
18. control unit according to claim 11; It is characterized in that, also comprise bypass decision circuitry on, when this output voltage is lower than one the 4th magnitude of voltage; Should go up the bypass decision circuitry and produce bypass output signal on, wherein the 4th magnitude of voltage is lower than this first magnitude of voltage.
19. control unit according to claim 11 is characterized in that, wherein also comprises a bypass resistance, when this bypass resistance receives on one the bypass input signal and detects this order input signal, makes this control unit produce this and exports signal in proper order.
20. control unit according to claim 11; It is characterized in that; Wherein this heterogeneous output circuit is after producing this and exporting signal in proper order, detects to stop to produce this when this output voltage is higher than one the 5th magnitude of voltage once again and export signal in proper order, and wherein the 5th magnitude of voltage is higher than this first magnitude of voltage.
21. control unit according to claim 11 is characterized in that, wherein the change-over circuit controlled of this control unit comprises the inductance of a plurality of series connection.
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| US10396771B2 (en) | 2014-01-14 | 2019-08-27 | Mediatek Inc. | Voltage supply circuits and controlling methods therefor |
| CN110445380A (en) * | 2019-07-26 | 2019-11-12 | 成都芯源系统有限公司 | Multiphase switch converter containing daisy chain structure and sequence number distribution method thereof |
| CN110445381A (en) * | 2019-07-26 | 2019-11-12 | 成都芯源系统有限公司 | Multiphase switch converter containing daisy chain structure and phase switching control method thereof |
| CN117039806A (en) * | 2023-09-26 | 2023-11-10 | 杰华特微电子股份有限公司 | Multiphase power converter and control circuit and control method thereof |
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