CN203352428U - Multiphase switch converter and controller thereof - Google Patents
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Abstract
Multiphase switching converters and controllers thereof are disclosed. The multiphase switching converter includes a plurality of switching circuits having outputs coupled together to supply a load, the controller comprising: a bias current generating circuit receiving a plurality of phase temperature signals representing a temperature of the switching circuit and generating a plurality of bias current signals based on the plurality of phase temperature signals and a temperature reference signal; the temperature equalization modulation circuit is coupled to the switching circuit to receive a plurality of phase current signals representing the output current of the switching circuit, is coupled to the bias current generation circuit to receive a plurality of bias current signals, and generates a plurality of conduction time signals based on the plurality of phase current signals, the plurality of bias current signals, the current reference signal and the preset conduction time signal; and the logic circuit is coupled to the uniform temperature modulation circuit to receive the plurality of conduction time signals and generate a plurality of control signals according to the plurality of conduction time signals so as to control the plurality of switch circuits to be sequentially conducted.
Description
Technical field
Embodiment of the present utility model relates to electronic circuit, relates in particular to heterogeneous switch converters and controller thereof with thermal balance function.
Background technology
The performance that heterogeneous switch converters is superior with it, be widely used in the solution of high-performance cpu power.In heterogeneous switch converters, the working temperature of each phase switch circuit should equate, the overheated operation of any phase switch circuit will make the fluctuation of service of switch converters, even causes whole switch converters to be closed.
Usually, heterogeneous switch converters is realized the effect of temperature equalization by the output current of balanced each phase switch circuit.Ideally, when the output current of each phase switch circuit equates, its power loss and temperature rise thereof also should equate.Yet, usually dispose the air flow cooling units such as fan in actual CPU application system.As shown in the example of Fig. 1, although the electric current of each phase switch circuit is equal, due to the impact that is subject to different cooler environments, the temperature of each phase switch circuit will be different: from first-phase Phase1 to N phase Phase N, the temperature of switching circuit is by successively decreasing mutually.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of heterogeneous switch converters and controller thereof that has more effective even temperature effect with respect to prior art.
Controller according to a kind of heterogeneous switch converters of the utility model one embodiment, this heterogeneous switch converters comprises a plurality of switching circuits with output, it is load supplying together that the output of the plurality of switching circuit is coupled in, this controller comprises: bias current generating circuit, there are a plurality of first input ends, the second input and a plurality of output, wherein a plurality of first input ends receive respectively the phase temperature signal of a plurality of representation switch circuit temperatures, the second input receives temperature reference signal, bias current generating circuit is based on a plurality of phase temperature signals and temperature reference signal, produce a plurality of bias current signal at a plurality of outputs, the samming modulation circuit, there are a plurality of first input ends, a plurality of the second inputs, the 3rd input, four-input terminal and a plurality of output, wherein a plurality of first input ends are coupled to switching circuit to receive the phase current signal of a plurality of representation switch circuit output currents, a plurality of the second inputs are coupled to bias current generating circuit to receive a plurality of bias current signal, the 3rd input received current reference signal, four-input terminal receives default ON time signal, the samming modulation circuit is based on the plurality of phase current signal, a plurality of bias current signal, current reference signal and default ON time signal, produce a plurality of ON time signals at a plurality of outputs, and logical circuit, there is a plurality of inputs and a plurality of output, wherein a plurality of inputs are coupled to the samming modulation circuit to receive a plurality of ON time signals, logical circuit produces a plurality of control signals according to the plurality of ON time signal at a plurality of outputs, to control the conducting successively of a plurality of switching circuits.
In one embodiment, bias current generating circuit comprises: a plurality of subtracters, each subtracter all has first input end, the second input and output, wherein first input end receives temperature reference signal, the second input receives corresponding phase temperature signal, subtracter subtracts each other temperature reference signal and phase temperature signal, at output, produces temperature error signals; And a plurality of proportional integral circuit, each proportional integral circuit all has input and output, the output that wherein input is coupled to corresponding subtracter is to receive temperature error signals, and the proportional integral circuit carries out proportional integral to temperature error signals, at output, produces bias current signal.
In one embodiment, the samming modulation circuit comprises: a plurality of plus and minus calculation devices, each plus and minus calculation device all has first input end, the second input, the 3rd input and output, first input end received current reference signal wherein, the second input is coupled to bias current generating circuit to receive corresponding bias current signal, the 3rd input receives corresponding phase current signal, the plus and minus calculation device subtracts each other with value and phase current signal current reference signal and bias current signal addition, in output generation current error signal; A plurality of proportional integral circuit, each proportional integral circuit all has input and output, wherein input is coupled to the output of corresponding plus and minus calculation device with the received current error signal, the proportional integral circuit carries out proportional integral to current error signal, at output, produces biasing ON time signal; And a plurality of adders, each adder all has first input end, the second input and output, wherein first input end is coupled to the output of corresponding proportion integrating circuit to receive biasing ON time signal, the second input receives default ON time signal, adder will setover ON time signal and default ON time signal plus, produce the ON time signal at output.
In one embodiment, controller also comprises a plurality of amplitude limiter circuits, and each amplitude limiter circuit is coupled between the input of the output of corresponding plus and minus calculation device and corresponding proportion integrating circuit, and current error signal is carried out to amplitude limit.
In one embodiment, controller also comprises that reference temperature produces circuit, there is a plurality of inputs and output, wherein a plurality of inputs receive respectively a plurality of phase temperature signals, this reference temperature produces circuit and select a phase temperature signal from the plurality of phase temperature signal, at output, it is provided to bias current generating circuit as temperature reference signal.
In another embodiment, reference temperature produces circuit, there is a plurality of inputs and output, wherein a plurality of inputs receive respectively a plurality of phase temperature signals, and this reference temperature produces circuit and at output, the mean value of the plurality of phase temperature signal provided to bias current generating circuit as temperature reference signal.
Controller according to a kind of heterogeneous switch converters of the another embodiment of the utility model, this heterogeneous switch converters comprises a plurality of switching circuits with output, it is load supplying together that the output of the plurality of switching circuit is coupled in, this controller comprises: bias current generating circuit, there are a plurality of first input ends, the second input and a plurality of output, wherein a plurality of first input ends receive the phase temperature signal of a plurality of representation switch circuit temperatures, the second input receives temperature reference signal, bias current generating circuit is based on a plurality of phase temperature signals and temperature reference signal, produce a plurality of bias current signal at a plurality of outputs, a plurality of plus and minus calculation devices, each plus and minus calculation device all has first input end, the second input, the 3rd input and output, first input end received current reference signal wherein, the second input is coupled to bias current generating circuit to receive corresponding bias current signal, the 3rd input receives the phase current signal that represents respective switch circuit output current, what the plus and minus calculation device obtained current reference signal and bias current signal addition subtracts each other with value and phase current signal, in output generation current error signal, a plurality of proportional integral circuit, each proportional integral circuit all has input and output, the output that wherein input is coupled to corresponding plus and minus calculation device is with the received current error signal, and the proportional integral circuit carries out proportional integral to current error signal, at output, produces offset signal, and control circuit, there is a plurality of inputs and a plurality of output, wherein a plurality of inputs are coupled to respectively the output of a plurality of proportional integral circuit to receive a plurality of offset signals, control circuit produces a plurality of control signals based on the plurality of offset signal at a plurality of outputs, to control the conducting successively of a plurality of switching circuits.
In one embodiment, bias current generating circuit comprises: a plurality of subtracters, each subtracter all has first input end, the second input and output, wherein first input end receives temperature reference signal, the second input receives corresponding phase temperature signal, subtracter subtracts each other temperature reference signal and phase temperature signal, at output, produces temperature error signals; And a plurality of proportional integral circuit, each proportional integral circuit all has input and output, the output that wherein input is coupled to corresponding subtracter is to receive temperature error signals, and the proportional integral circuit carries out proportional integral to temperature error signals, at output, produces bias current signal.
In one embodiment, controller also comprises a plurality of amplitude limiter circuits, and each amplitude limiter circuit is coupled between the input of the output of corresponding plus and minus calculation device and corresponding proportion integrating circuit, and current error signal is carried out to amplitude limit.
In one embodiment, controller also comprises that reference temperature produces circuit, there is a plurality of inputs and output, wherein a plurality of inputs receive respectively a plurality of phase temperature signals, and this reference temperature produces circuit and at output, the mean value of the plurality of phase temperature signal provided to bias current generating circuit as temperature reference signal.
A kind of heterogeneous switch converters according to another embodiment of the utility model, comprise controller as above.
According to heterogeneous switch converters of the present utility model and controller thereof, can be according to the variations in temperature of temperature reference signal and switching circuit, produce the bias current signal of responding to switch circuit temperature situation, bias current signal control signal to switching circuit together with current reference signal is regulated, thereby the actual output current of control switch circuit is made change, realize the even temperature effect of a plurality of switching circuits.
The accompanying drawing explanation
Fig. 1 is the work exemplary plot of existing heterogeneous switch converters while being applied to cpu system;
Fig. 2 is the block diagram according to the heterogeneous switch converters 100 of the utility model one embodiment;
Fig. 3 is the circuit theory diagrams with samming modulation circuit 106 according to bias current generating circuit shown in Fig. 2 of the utility model one embodiment 105;
Fig. 4 is the block diagram according to the 4 phase switch converters 700 of the utility model one embodiment;
Work exemplary plot when Fig. 5 is applied to cpu system for the heterogeneous switch converters according to the utility model one embodiment.
Embodiment
Below will describe specific embodiment of the utility model in detail, it should be noted that the embodiments described herein, only for illustrating, is not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.Yet, it will be obvious to those skilled in the art that and needn't adopt these specific detail to carry out the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised at least one embodiment of the utility model.Therefore, phrase " in one embodiment ", " in an embodiment ", " example " or " example " occurred in each place of whole specification differs to establish a capital and refers to same embodiment or example.In addition, can with any suitable combination and/or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that the accompanying drawing provided at this is all for illustrative purposes, and accompanying drawing is not necessarily drawn in proportion.Should be appreciated that it can be directly connected or coupled to another element or can have intermediary element when claiming " element " " to be connected to " or " coupling " during to another element.On the contrary, when claiming element " to be directly connected to " or during " being directly coupled to " another element, not having intermediary element.Identical Reference numeral is indicated identical element.Term used herein " and/or " comprise any and all combinations of one or more relevant projects of listing.
Fig. 2 is the block diagram according to the heterogeneous switch converters 100 of the utility model one embodiment.Heterogeneous switch converters 100 comprises multiphase power converting circuit 101 and controller 102.Multiphase power converting circuit 101 comprises N switching circuit, and wherein N is more than or equal to 2 integer.The input of this N switching circuit receives input voltage vin, and output is coupled in together, provides output voltage V out to drive load.Switching circuit in multiphase power converting circuit 101 can adopt any DC-DC or ac/dc transformation topology structure, for example synchronous or asynchronously boost, buck converter, and normal shock, anti exciting converter etc.Controller 102 comprises bias current generating circuit 105, samming modulation circuit 106 and logical circuit 107.
Bias current generating circuit 105 has N first input end, the second input and N output, wherein N first input end is coupled to N switching circuit, receive respectively the phase temperature signal t_phase1～t_phaseN of N representation switch circuit temperature, the second input receives temperature reference signal t_ref, bias current generating circuit 105, based on N phase temperature signal t_phase1～t_phaseN and temperature reference signal t_ref, produces N bias current signal i_offset1～i_offsetN at N output.
Samming modulation circuit 106 has N first input end, N the second input, the 3rd input, four-input terminal and output, wherein N first input end is coupled to the output of N switching circuit to receive respectively the phase current signal i_phase1～i_phaseN of N representation switch circuit output current, N the second input is coupled to N output of bias current generating circuit 105 to receive respectively N bias current signal i_offset1～i_offsetN, the 3rd input received current reference signal i_ref, four-input terminal receives default ON time signal ton.Samming modulation circuit 106, based on phase current signal i_phase1～i_phaseN, bias current signal i_offset1～i_offsetN, current reference signal i_ref and default ON time signal ton, produces N ON time signal ton1～tonN at N output.
Logical circuit 107 has N input and N output, wherein N input is coupled to samming modulation circuit 106 to receive N ON time signal ton1～tonN, logical circuit 107 is according to ON time signal ton1～tonN, produce the control signal PWM1 of N switching circuit～PWMN at N output, with N switching circuit conducting successively in control multiphase power converting circuit 101.ON time signal ton1～tonN is used to control the ON time of each phase switch circuit.Default ON time signal ton can be set to steady state value, also can be set to the variable value relevant with input voltage vin and/or output voltage V out.Heterogeneous switch converters 100 can adopt constant on-time to control (COT control), when being less than reference voltage, by the respective switch circuit turn-on, and when ON time reaches the time threshold of corresponding ON time signal setting, the respective switch circuit is turn-offed output voltage V out.
According to the embodiment shown in Fig. 2, controller 102 can be according to the phase temperature signal t_phase1～t_phaseN of temperature reference signal t_ref and representation switch circuit temperature, the bias current signal i_offset1 of generation responding to switch circuit temperature situation～i_offsetN, this bias current signal i_offset1～i_offsetN is regulated the control signal PWM1 of switching circuit～PWMN together with current reference signal i_ref, thereby the actual output current of controlling each phase switch circuit is made change, realize the even temperature effect of a plurality of switching circuits.
In one embodiment, controller 102 also comprises that reference temperature produces circuit 103.In one embodiment, reference temperature produces circuit 103 and has N input and output, wherein N input receives respectively N phase temperature signal t_phase1～t_phaseN, and select a phase temperature signal from N phase temperature signal, at output, it is provided to bias current generating circuit 105 as temperature reference signal t_ref.Select which phase temperature signal to preset, also can be determined according to practical situations by the user.In another embodiment, reference temperature produces circuit 103 and has N input and output, wherein N input receives respectively N phase temperature signal t_phase1～t_phaseN, at output, the mean value of N phase temperature signal provided to bias current generating circuit 105 as temperature reference signal t_ref.
In one embodiment, heterogeneous switch converters 100 also comprises reference current generating circuit 104.In one embodiment, reference current generating circuit 104 has N input and output, wherein N input receives respectively N phase current signal i_phase1～i_phaseN, and select a phase current signal from N phase current signal, at output, it is provided to samming modulation circuit 106 as current reference signal i_ref.Select which phase current signal to preset, also can be determined according to practical situations by the user.In another embodiment, reference current generating circuit 104 has N input and output, wherein N input receives respectively N phase current signal i_phase1～i_phaseN, at output, the mean value of N phase current signal provided to samming modulation circuit 106 as current reference signal i_ref.
Fig. 3 is the circuit theory diagrams according to bias current generating circuit 105 shown in Fig. 2 of the utility model one embodiment and samming modulation circuit 106.Bias current generating circuit 105 comprises subtracter 502_1～502_N and proportional integral circuit 504_1～504_N.Each subtracter 502_x all has first input end, the second input and output, wherein first input end receives temperature reference signal t_ref, the second input receives corresponding phase temperature signal t_phasex, subtracter 502_x subtracts each other temperature reference signal t_ref and phase temperature signal t_phasex, and the temperature error signals t_ex of the difference that represents both is provided at output.Each proportional integral circuit 504_x all has input and output, wherein input is coupled to the output of corresponding subtracter 502_x, receive temperature error signals t_ex, proportional integral circuit 504_x carries out proportional integral to temperature error signals t_ex, at output, produces bias current signal i_offsetx.
In one embodiment, samming modulation circuit 106 comprises plus and minus calculation device 602_1～602_N, proportional integral circuit 606_1～606_N and adder 608_1～608_N.Each plus and minus calculation device 602_x all has first input end, the second input, the 3rd input and output, first input end received current reference signal i_ref wherein, the second input receives corresponding bias current signal i_offsetx, and the 3rd input receives corresponding phase current signal i_phasex.Plus and minus calculation device 602_x is by current reference signal i_ref and bias current signal i_offsetx addition, and what obtain subtracts each other with value and phase current signal i_phasex, at output, provides current error signal i_ex.Each proportional integral circuit 606_x all has input and output, wherein input is coupled to the output of corresponding plus and minus calculation device 602_x, received current error signal i_ex, proportional integral circuit 606_x carries out proportional integral to current error signal i_ex, at output, produces biasing ON time signal bias_x.Each adder 608_x all has first input end, the second input and output, wherein first input end receives default ON time signal ton, the second input is coupled to the output of corresponding proportional integral circuit 606_x to receive biasing ON time signal bias_x, adder 608_x will preset ON time signal ton and biasing ON time signal bias_x addition, at output, provide ON time signal tonx.
In one embodiment, samming modulation circuit 106 also comprises amplitude limiter circuit 604_1～604_N.Each amplitude limiter circuit 604_x all is coupled between the input of the output of corresponding plus and minus calculation device 602_x and corresponding proportion integrating circuit 606_x, and amplitude limiter circuit 604_x carries out amplitude limit to current error signal i_ex, by its amplitude limitation in preset range.
Specifically, bias current generating circuit 105 subtracts each other phase temperature signal t_phasex and temperature reference signal t_ref, produces temperature error signals t_ex, and this temperature error signals t_ex is carried out to proportional integral, produces bias current signal i_offsetx.What samming modulation circuit 106 obtained bias current signal i_offsetx with current reference signal i_ref addition compares with phase current signal i_phasex with value, and produces the ON time signal tonx of switching circuit according to comparative result.
In the foregoing embodiments, the ON time that biasing ON time bias_x is used to regulate each phase switch circuit.Yet those skilled in the art are known, biasing ON time bias_x also can be used to switching frequency, duty cycle of switching or other the parameter of by-pass cock circuit, as long as can realize the adjusting to the switching circuit output current.For example, based on biasing ON time bias_x, in the temperature of certain phase switch circuit, during higher than temperature reference signal, controller diminishes the duty ratio of this phase switch circuit, and the output current of this phase switch circuit diminishes thereupon; At certain phase switch circuit, make during lower than temperature reference signal the duty ratio of this phase switch circuit become large, the output current of this phase switch circuit becomes greatly thereupon, thereby reaches the effect of each phase switch circuit temperature of balance.
Fig. 4 is the block diagram according to the 4 phase switch converters 700 of the utility model one embodiment.4 phase switch converters 700 comprise 4 phase power conversion circuit 701 and controllers.Controller comprises bias current generating circuit 705, plus and minus calculation device 61～64, proportional integral circuit PI_5～PI_8 and control circuit 709.In addition, 4 phase switch converters 700 also comprise D/A converting circuit 702.Wherein the corresponding circuits in bias current generating circuit 705, plus and minus calculation device 61～64 and proportional integral circuit PI_5～PI_8 and previous embodiment is basic identical.For convenience of description, same section will repeat no more.
As shown in Figure 4, multiphase power converting circuit 701 comprises 4 switching circuits, and the input of these 4 switching circuits receives input voltage, and output is coupled in together, provides output voltage to drive load.
Analog to digital conversion circuit 702 has first group of input, second group of input and output, wherein first group of input receives the current sampling signal CS1～CS4 that represents respective switch circuit output current, and second group of input receives the temperature sampling signal TSx that represents each phase switch circuit temperature.Analog to digital conversion circuit is based on current sampling signal CSx and temperature sampling signal TSx (x=1,2,3,4), at its output, produce successively the phase current signal i_phasex of representation switch circuit output current and the phase temperature signal t_phasex of representation switch circuit temperature.In one embodiment, temperature sampling signal TS1～TS4 obtains from the temperature detection treatment system that is coupled to 4 switching circuits.
In the embodiment shown in fig. 4, analog to digital conversion circuit 702 comprises buffer BUF1～BUF4, filter LPF1～LPF4, multidiameter option switch MUX and digital to analog converter ADC.Each buffer BUFx has input and output, input received current detection signal CSx wherein, and buffer BUFx is isolated current sampling signal CSx.Each filter LPFx all has input and output, wherein input receives the current sampling signal CSx that represents respective switch circuit output current, filter LPFx carries out low-pass filtering to current sampling signal CSx, at output, provides average current sampled signal ACSx.
MUX MUX has 8 inputs and output, the output that wherein 4 inputs are coupled to respectively filter LPF1～LPF4 is to receive average current sampled signal ACS1～ACS4, and remaining 4 input receives the temperature sampling signal TSx of representation switch circuit temperatures.Under the control of channel selecting signal, MUX MUX provides average current sampled signal ACS1～ACS4 and temperature sampling signal TS1～TS4 successively to its output.Analog to digital converter ADC has input and output, and wherein input is coupled to the output of MUX MUX, and output provides phase current signal i_phase1～i_phase4 and phase temperature signal t_phase1～t_phase4 successively.
As shown in Figure 4, bias current generating circuit 705 has 4 first input ends, the second input and 4 outputs, wherein 4 first input ends receive the phase temperature signal t_phase1～t_phase4 of 4 representation switch circuit temperatures, the second input receives temperature reference signal t_ref, bias current generating circuit 705, based on phase temperature signal t_phase1～t_phase4 and temperature reference signal t_ref, produces respectively bias current signal i_offset1～i_offset4 at 4 outputs.In the embodiment shown in fig. 4, bias current generating circuit 705 comprises subtracter 51～54 and proportional integral circuit PI_1～PI_4.Plus and minus calculation device 61～64 is by current reference signal i_ref and bias current signal i_offsetx addition, and what obtain subtracts each other with value and phase current signal i_phasex, at output, provides current error signal i_ex.The current error signal i_ex that proportional integral circuit PI_5～PI_8 provides plus and minus calculation device 61～64 outputs carries out proportional integral, at output, produces offset signal bias_x '.In one embodiment, controller also comprises amplitude limiter circuit 71～74.
In one embodiment, controller also comprises that reference temperature produces circuit 703.In one embodiment, reference temperature produces circuit 703 and has 4 inputs and output, wherein 4 inputs are coupled to analog to digital conversion circuit 702 and receive respectively phase temperature signal t_phase1～t_phase4, reference temperature produces circuit 703 and select a phase temperature signal from 4 phase temperature signal, at output, it is provided to bias current generating circuit 705 as temperature reference signal t_ref.Select which phase temperature signal to preset, also can be determined according to practical situations by the user.The user can be write related register by fieldbus, thereby realizes the adjustment to temperature reference signal.In another embodiment, reference temperature produces circuit 703 and has 4 inputs and output, wherein 4 inputs receive respectively the phase temperature signal t_phase1～t_phase4 of 4 representation switch circuit temperatures, and reference temperature produces circuit 703 and at output, the mean value of 4 phase temperature signals provided to bias current generating circuit 705 as temperature reference signal t_ref.In the embodiment shown in fig. 4, reference temperature generation circuit 703 comprises summer 31 and divider 32.Summer 31 has 4 inputs and output, and wherein 4 inputs receive phase temperature signal t_phase1～t_phase4.Summer 31 coordinates together with divider 32, and the mean value of phase temperature signal t_phase1～t_phase4 is provided to bias current generating circuit 705 as temperature reference signal t_ref.
In one embodiment, controller also comprises reference current generating circuit 704.In one embodiment, reference current generating circuit 704 has 4 inputs and output, wherein 4 inputs are coupled to analog to digital conversion circuit 702 and receive respectively phase current signal i_phase1～i_phase4, reference current generating circuit 704 is selected a phase current signal from 4 phase current signals, at output, it is provided to plus and minus calculation device 61～64 as current reference signal i_ref.Select which phase current signal to preset, also can be determined according to practical situations by the user.The user can be write related register by fieldbus, thereby realizes the adjustment to current reference signal.In another embodiment, reference current generating circuit 704 has 4 inputs and output, wherein 4 inputs are coupled to analog to digital conversion circuit 702 and receive respectively phase current signal i_phase1～i_phase4, reference current generating circuit 704, provides to plus and minus calculation device 61～64 using the mean value of 4 phase current signals as current reference signal i_ref at output.In the embodiment shown in fig. 4, reference current generating circuit 704 comprises summer 41 and divider 42.Summer 41 has 4 inputs and output, and wherein 4 inputs receive respectively phase current signal i_phase1～i_phase4.Summer 41 coordinates together with divider 42, and the mean value of phase current signal i_phase1～i_phase4 is provided to plus and minus calculation device 61～64 as current reference signal i_ref.
According to the embodiment shown in Fig. 4, controller can be according to the phase temperature signal t_phase1～t_phase4 of temperature reference signal t_ref and representation switch circuit temperature, the bias current signal i_offset1 of generation responding to switch circuit temperature situation～i_offset4, this bias current signal i_offset1～i_offset4 is regulated the control signal CTRL1 of switching circuit～CTRL4 together with current reference signal i_ref, thereby the actual output current of controlling each phase switch circuit is made change, realize the even temperature effect of switching circuit.
Work exemplary plot when Fig. 5 is applied to cpu system for the heterogeneous switch converters according to the utility model one embodiment.As shown in Figure 5, after the control circuit of heterogeneous switch converters adopts above-described embodiment of the present utility model, although multi-phase converter is subject to the impact of different cooler environments, the output current of each phase switch circuit is adjusted so that the temperature of each phase switch circuit equates.Therefore, heterogeneous switch converters even temperature effect has obtained significant raising, has realized real effectively equalized temperature.
Although with reference to several exemplary embodiments, described the utility model, should be appreciated that term used is explanation and exemplary and nonrestrictive term.Because the utility model can specifically be implemented in a variety of forms and not break away from spirit or the essence of utility model, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (11)
1. the controller of a heterogeneous switch converters, is characterized in that, this heterogeneous switch converters comprises a plurality of switching circuits with output, and it is load supplying together that the output of the plurality of switching circuit is coupled in, and this controller comprises:
Bias current generating circuit, there is a plurality of first input ends, the second input and a plurality of output, wherein a plurality of first input ends receive respectively the phase temperature signal of a plurality of representation switch circuit temperatures, the second input receives temperature reference signal, bias current generating circuit, based on a plurality of phase temperature signals and temperature reference signal, produces a plurality of bias current signal at a plurality of outputs;
The samming modulation circuit, there are a plurality of first input ends, a plurality of the second inputs, the 3rd input, four-input terminal and a plurality of output, wherein a plurality of first input ends are coupled to switching circuit to receive the phase current signal of a plurality of representation switch circuit output currents, a plurality of the second inputs are coupled to bias current generating circuit to receive a plurality of bias current signal, the 3rd input received current reference signal, four-input terminal receives default ON time signal, the samming modulation circuit is based on the plurality of phase current signal, a plurality of bias current signal, current reference signal and default ON time signal, produce a plurality of ON time signals at a plurality of outputs, and
Logical circuit, there is a plurality of inputs and a plurality of output, wherein a plurality of inputs are coupled to the samming modulation circuit to receive a plurality of ON time signals, and logical circuit produces a plurality of control signals according to the plurality of ON time signal at a plurality of outputs, to control the conducting successively of a plurality of switching circuits.
2. controller as claimed in claim 1, is characterized in that, bias current generating circuit comprises:
A plurality of subtracters, each subtracter all has first input end, the second input and output, wherein first input end receives temperature reference signal, the second input receives corresponding phase temperature signal, subtracter subtracts each other temperature reference signal and phase temperature signal, at output, produces temperature error signals; And
A plurality of proportional integral circuit, each proportional integral circuit all has input and output, the output that wherein input is coupled to corresponding subtracter is to receive temperature error signals, and the proportional integral circuit carries out proportional integral to temperature error signals, at output, produces bias current signal.
3. controller as claimed in claim 1, is characterized in that, the samming modulation circuit comprises:
A plurality of plus and minus calculation devices, each plus and minus calculation device all has first input end, the second input, the 3rd input and output, first input end received current reference signal wherein, the second input is coupled to bias current generating circuit to receive corresponding bias current signal, the 3rd input receives corresponding phase current signal, the plus and minus calculation device subtracts each other with value and phase current signal current reference signal and bias current signal addition, in output generation current error signal;
A plurality of proportional integral circuit, each proportional integral circuit all has input and output, wherein input is coupled to the output of corresponding plus and minus calculation device with the received current error signal, the proportional integral circuit carries out proportional integral to current error signal, at output, produces biasing ON time signal; And
A plurality of adders, each adder all has first input end, the second input and output, wherein first input end is coupled to the output of corresponding proportion integrating circuit to receive biasing ON time signal, the second input receives default ON time signal, adder will setover ON time signal and default ON time signal plus, produce the ON time signal at output.
4. controller as claimed in claim 3, is characterized in that, also comprises:
A plurality of amplitude limiter circuits, each amplitude limiter circuit is coupled between the input of the output of corresponding plus and minus calculation device and corresponding proportion integrating circuit, and current error signal is carried out to amplitude limit.
5. controller as claimed in claim 1, is characterized in that, also comprises:
Reference temperature produces circuit, there is a plurality of inputs and output, wherein a plurality of inputs receive respectively a plurality of phase temperature signals, this reference temperature produces circuit and select a phase temperature signal from the plurality of phase temperature signal, at output, it is provided to bias current generating circuit as temperature reference signal.
6. controller as claimed in claim 1, is characterized in that, also comprises:
Reference temperature produces circuit, there is a plurality of inputs and output, wherein a plurality of inputs receive respectively a plurality of phase temperature signals, and this reference temperature produces circuit and at output, the mean value of the plurality of phase temperature signal provided to bias current generating circuit as temperature reference signal.
7. the controller of a heterogeneous switch converters, is characterized in that, this heterogeneous switch converters comprises a plurality of switching circuits with output, and it is load supplying together that the output of the plurality of switching circuit is coupled in, and this controller comprises:
Bias current generating circuit, there is a plurality of first input ends, the second input and a plurality of output, wherein a plurality of first input ends receive the phase temperature signal of a plurality of representation switch circuit temperatures, the second input receives temperature reference signal, bias current generating circuit, based on a plurality of phase temperature signals and temperature reference signal, produces a plurality of bias current signal at a plurality of outputs;
A plurality of plus and minus calculation devices, each plus and minus calculation device all has first input end, the second input, the 3rd input and output, first input end received current reference signal wherein, the second input is coupled to bias current generating circuit to receive corresponding bias current signal, the 3rd input receives the phase current signal that represents respective switch circuit output current, what the plus and minus calculation device obtained current reference signal and bias current signal addition subtracts each other with value and phase current signal, in output generation current error signal;
A plurality of proportional integral circuit, each proportional integral circuit all has input and output, the output that wherein input is coupled to corresponding plus and minus calculation device is with the received current error signal, and the proportional integral circuit carries out proportional integral to current error signal, at output, produces offset signal; And
Control circuit, there is a plurality of inputs and a plurality of output, wherein a plurality of inputs are coupled to respectively the output of a plurality of proportional integral circuit to receive a plurality of offset signals, control circuit produces a plurality of control signals based on the plurality of offset signal at a plurality of outputs, to control the conducting successively of a plurality of switching circuits.
8. controller as claimed in claim 7, is characterized in that, bias current generating circuit comprises:
A plurality of subtracters, each subtracter all has first input end, the second input and output, wherein first input end receives temperature reference signal, the second input receives corresponding phase temperature signal, subtracter subtracts each other temperature reference signal and phase temperature signal, at output, produces temperature error signals; And
A plurality of proportional integral circuit, each proportional integral circuit all has input and output, the output that wherein input is coupled to corresponding subtracter is to receive temperature error signals, and the proportional integral circuit carries out proportional integral to temperature error signals, at output, produces bias current signal.
9. controller as claimed in claim 7, is characterized in that, also comprises:
A plurality of amplitude limiter circuits, each amplitude limiter circuit is coupled between the input of the output of corresponding plus and minus calculation device and corresponding proportion integrating circuit, and current error signal is carried out to amplitude limit.
10. controller as claimed in claim 7, is characterized in that, also comprises:
Reference temperature produces circuit, there is a plurality of inputs and output, wherein a plurality of inputs receive respectively a plurality of phase temperature signals, and this reference temperature produces circuit and at output, the mean value of the plurality of phase temperature signal provided to bias current generating circuit as temperature reference signal.
11. a heterogeneous switch converters, comprise controller as described as any one in claim 1 to 10.
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| CN112865498A (en) * | 2021-01-29 | 2021-05-28 | 成都芯源系统有限公司 | Multiphase switching converter, controller and control method thereof |
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| CN112865498A (en) * | 2021-01-29 | 2021-05-28 | 成都芯源系统有限公司 | Multiphase switching converter, controller and control method thereof |
| CN112865498B (en) * | 2021-01-29 | 2022-05-17 | 成都芯源系统有限公司 | Multiphase switching converter, controller and control method thereof |
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