CN202652068U - Multiphase DC-DC converter and relevant control device - Google Patents
Multiphase DC-DC converter and relevant control device Download PDFInfo
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- CN202652068U CN202652068U CN 201220164035 CN201220164035U CN202652068U CN 202652068 U CN202652068 U CN 202652068U CN 201220164035 CN201220164035 CN 201220164035 CN 201220164035 U CN201220164035 U CN 201220164035U CN 202652068 U CN202652068 U CN 202652068U
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Abstract
The utility model provides a multiphase DC-DC converter and a relevant control device, which can be used for supplying power to a load. The multiphase DC-DC converter comprises a plurality of power levels, a plurality of channel current conversion circuits, a plurality of current detection circuits, a transduction amplifier, a comparator and a channel current balance circuit. The current detection circuit can detect each channel current, the transduction amplifier and the comparator are coupled with the current detection circuit, so as to receive the voltage difference generated by total current of the channel current through a resistor and generate a detection signal of the total current output to the load. The channel current conversion circuit is coupled with the current detection circuit to generate the detection signal of each channel current. The channel current balance circuit is coupled with the comparator, the transduction amplifier and the channel current conversion circuit to balance the current output from each current channel. The circuit structure of the multiphase DC-DC converter is simple, the circuit element is more elastically selected, and the design complexity is reduced.
Description
Technical field
The utility model is relevant for DC-DC converter, and espespecially a kind of multiphase DC is to direct current transducer and relevant control device.
Background technology
Multiphase DC adopts a plurality of current channels to load supplying to direct current transducer (Multiphase DC-DC converter), not only can when load variations, react fast to supply required electric current, also have the advantages such as low ripple, and be widely used in various fields.
Yet; in the application of multiphase DC to direct current transducer; multiphase DC need to be known the electric current that each current channel is supplied and the total current that is supplied to load to the control device of direct current transducer; can utilize fifty-fifty each current channel to power and carry out the functions such as overcurrent protection, and guarantee that multiphase DC can normal operation to direct current transducer.
In the U.S. the 6th, 683,441,7,064,528 and 7,928, several circuit frameworks are proposed in No. 704 patents, direct current transducer is supplied to the total current of load with the detecting multiphase DC.These circuit frameworks are comprised of elements such as resistance, electric capacity and amplifiers, to produce the proportional signal of total current that direct current transducer is exported to load with multiphase DC.Yet, more for the restriction of the resistance value of these elements when in these circuit frameworks, selecting the element such as resistance and electric capacity, and more do not have elasticity in the design.In addition, some circuit framework even the current sense signal of each passage can be coupled to the positive input terminal (non-inverting input) of amplifier, because the input impedance of the positive input terminal of amplifier is very high, electric current almost can't flow into the positive input terminal of amplifier, and does not also have other current path at the positive input terminal of amplifier.Therefore, more cause the difficulty on the circuit design, and increased the complexity of hardware designs.
In addition, when above-mentioned circuit framework detecting multiphase DC exports the total current of load to direct current transducer, the detection signal of each channel current can be by elements such as resistance, the temperature that makes these elements rises and causes the variation of resistance value, cause the detection signal that produces inaccurate, and need to take in addition complicated temperature-compensating mechanism, to guarantee the accuracy of detection signal.
The utility model content
In view of this, how to alleviate or solve in the above-mentioned association area detecting multiphase DC direct current transducer is supplied to the problem of the total current of load, real is the industry problems to be solved.
The utility model provides the embodiment of a kind of multiphase DC to direct current transducer, in order to a load supplying, it includes: a plurality of power stages, each power stage includes on one bridge transistor and bridge transistor once, and the output of each power stage is coupled to this load by an inductance respectively; One first transduction amplifier, the positive input terminal of this first transduction amplifier and negative input end are respectively coupled to the two ends of a detecting resistance; One comparator, the positive input terminal of this comparator is coupled to this load, and the negative input end of this comparator is coupled to the positive input terminal of this first transduction amplifier, and the output of this comparator is coupled to the negative input end of this first transduction amplifier; A plurality of current-sensing circuits, each current-sensing circuit includes one first resistance, one second resistance and an electric capacity, wherein the first end of the first resistance is coupled to one of them output of these a plurality of power stages, the second end of the first resistance is coupled to the first end of electric capacity and the first end of the second resistance, the second end of electric capacity is coupled to this load, and the second end of the second resistance is coupled to the negative input end of this comparator; One of them the second end, the first end of electric capacity and the first end of the second resistance of the first resistance that a plurality of channel current change-over circuits, the input of each channel current change-over circuit are coupled to this load and are coupled to these a plurality of current-sensing circuits; An and channel current balancing circuitry, the input of this channel current balancing circuitry is coupled to the output of this first transduction amplifier and the output of these a plurality of channel current change-over circuits, and the output of this channel current balancing circuitry is coupled to this a plurality of power stages, with upper bridge transistor and the lower bridge transistor of controlling each power stage.
The utility model provides the embodiment of a kind of multiphase DC to the control device of direct current transducer in addition, in order to control a multiphase DC to direct current transducer to a load supplying; This multiphase DC includes a detecting resistance to direct current transducer, a plurality of power stages and a plurality of current-sensing circuit, the output of each power stage is coupled to this load by an inductance respectively, and each current-sensing circuit includes one first resistance, one second resistance and an electric capacity, wherein the first end of the first resistance is coupled to one of them output of these a plurality of power stages, the second end of the first resistance is coupled to the first end of electric capacity and the first end of the second resistance, the second end of electric capacity is coupled to this load, and the second end of the second resistance is coupled to this control device; This control device includes: one first transduction amplifier; One comparator, the positive input terminal of this comparator is coupled to this load, the negative input end of this comparator is coupled to the positive input terminal of this first transduction amplifier and the second end that is coupled to the second resistance of each current-sensing circuit, and the output of this comparator is coupled to the negative input end of this first transduction amplifier; A plurality of channel current change-over circuits, the input of each channel current change-over circuit is coupled to this load, and one of them the second end, the first end of electric capacity and the first end of the second resistance of the first resistance that is coupled to these a plurality of current-sensing circuits; An and channel current balancing circuitry, the input of this channel current balancing circuitry is coupled to the output of this first transduction amplifier and the output of these a plurality of channel current change-over circuits, and the output of this channel current balancing circuitry is coupled to this a plurality of power stages, with these a plurality of power stages of control; Wherein the two ends of this detecting resistance are respectively coupled to positive input terminal and the negative input end of this first transduction amplifier.
One of advantage of above-mentioned control device is that the selection of circuit element is more flexible, can and some circuit element be arranged at IC interior according to the design consideration, perhaps implements in the mode of discrete elements, to increase the elasticity of hardware designs.Another advantage of above-mentioned control device is that temperature-compensating mechanism is very simple, and can reduce the complexity of hardware designs.Other advantage of the present utility model will explain orally in more detail by the following description and accompanying drawing.
Description of drawings
Fig. 1 is the circuit diagram after the multiphase DC of the utility model one embodiment is simplified direct current transducer.
Fig. 2 is the circuit diagram after the multiphase DC of Fig. 1 is simplified an embodiment of the current-sensing circuit of direct current transducer and summed current change-over circuit.
Fig. 3 is the functional block diagram after the multiphase DC of Fig. 1 is simplified an embodiment of the channel current change-over circuit of direct current transducer.
Fig. 4 is the functional block diagram after the multiphase DC of Fig. 1 is simplified an embodiment of the channel current balancing circuitry of direct current transducer.
Embodiment
Below will cooperate correlative type that embodiment of the present utility model is described.In these were graphic, identical label represented identical or similar element.
Fig. 1 is the circuit diagram after the multiphase DC of the utility model one embodiment is simplified direct current transducer 100.Multiphase DC uses n current channel to load Z power supply to direct current transducer 100, that is multiphase DC is n phase DC-DC converter to direct current transducer 100.Multiphase DC includes control device 110, n power stage PS1～PSn (power stage only shows PS1 and PSn among Fig. 1), n inductance L 1～Ln (only showing L1 and Ln among Fig. 1), n current-sensing circuit CS1～CSn (only showing CS1 and CSn among Fig. 1), reaches resistance R IMON (also can be described as detecting resistance) direct current transducer 100.
For making more simple and clear being easy to of drawing illustrate that some element, pin and signal among Fig. 1 are not illustrated among the figure.For example, power stage PS2～PSn-1, inductance L 2～Ln-1, current-sensing circuit CS2～CSn-1 and corresponding annexation all are omitted, in addition, the output voltage V out that channel current detection signal Vph1～Vphn of current-sensing circuit CS1～CSn and multiphase DC export load to direct current transducer 100 is respectively coupled to pin Pvph1～Pvphn and the Pvout of control device 110, and these connecting lines also are omitted and are easy to explanation so that drawing is simple and clear.
Current signal IRY1～the IRYn of current-sensing circuit CS1～CSn output can form summed current signal Isum, and summed current signal Isum can produce corresponding voltage signal Vsum by resistance R IMON.
Summed current change-over circuit 111 receives output voltage V out by pin Pvout, and be coupled to the two ends of resistance R IMON by pin Psum and Pimon, to receive the voltage signal Vsum at resistance R IMON two ends, direct current transducer 100 is exported to the detection signal Icsum of the summed current of load and produce multiphase DC, and export channel current balancing circuitry 115 to.
Channel current change-over circuit 113 receives output voltage V out by pin Pvout, and the detection signal Vph1～Vphn by pin Pvph1～Pvphn difference receive path electric current, and produce the detection signal Iph1～Iphn of each channel current, and export channel current balancing circuitry 115 to.
Channel current balancing circuitry 115 is according to the detection signal Iph1～Iphn of each channel current and the detection signal Icsum of summed current, and produces respectively the control signal Cug1 of power stage PS1～PSn～Cugn and Clg1～Clgn.For example, in the present embodiment, channel current balancing circuitry 115 can produce pulse width modulation signals (pulse width modulated signal), with as control signal Cug1～Cugn and Clg1～Clgn.
In the present embodiment, each power stage PS1～PSn includes two transistors, and can distinguish the control signal Cug1 of receiving control device 100～one of them of Cugn and one of them of control signal Clg1～Clgn, and the output of each power stage PS1～PSn exports required voltage and/or electric current to load Z by inductance L 1～Ln respectively.For example, in the present embodiment, the power stage PSn of n current channel includes bridge transistor UGn and lower bridge transistor LGn, be coupled between current potential Vdd and the earthing potential (ground), respectively by control signal Cugn and the Clgn of pin Pugn and Plgn receive path current balance circuit 115, with in reasonable time turn-on transistor UGn or LGn, make the output of power stage PSn export required voltage and/or electric current by inductance L n to load Z.
Current-sensing circuit CS1～CSn is respectively coupled to the two ends of inductance L 1～Ln, with the flow through channel current of inductance L 1～Ln of detecting respectively, and the detection signal Vph1～Vphn of output current signal IRY1～IRYn and channel current respectively.For example, the end of the current-sensing circuit CSn of n current channel is coupled to an end and the power stage PSn of inductance L n, the other end of current-sensing circuit CSn then is coupled to the other end and the load Z of inductance L n, with the detection signal Vphn of generation current signal IRYn and n channel current.
The circuit diagram of Fig. 2 after to be multiphase DC to an embodiment of the current-sensing circuit CS1～CSn of direct current transducer 100 and summed current change-over circuit 111 simplify.For making more simple and clear being easy to of drawing illustrate that some element, pin and signal among Fig. 2 are not illustrated among the figure.For example, line between current-sensing circuit CS2～CSn-1 and summed current change-over circuit 111 and pin Pvout etc. all is not illustrated among the figure.
The first end of inductance L 1～Ln is respectively coupled to the output of power stage PS1～PSn, and the second end of inductance L 1～Ln is coupled to load Z.In the present embodiment, use resistance value and the inductance value difference equivalent inductance L1～Ln of series connection, so that the derivation of equation is more accurate.For example, the inductance L n of n current channel can use resistance value DCRn and inductance value LXn to carry out equivalence, and the first end of inductance L n is coupled to the output of power stage PSn, and the second end of inductance L n is coupled to load Z.
In the present embodiment, each current-sensing circuit CS1～CSn includes respectively two resistance and an electric capacity, all forms with identical framework.As shown in Figure 2, the current-sensing circuit CSn of n current channel includes resistance R Xn (also can be described as the first resistance), resistance R Yn (also can be described as the second resistance) and capacitor C Xn.The first end of resistance R Xn is coupled to the first end of inductance L n and the output of power stage PSn, and the second end of resistance R Xn is coupled to the first end of capacitor C Xn, first end and the pin Pvphn of RYn.And the second end of capacitor C Xn is coupled to the second end and the load Z of inductance L n.The second end of resistance R Yn is coupled to pin Psum.
In this enforcement, summed current change-over circuit 111 includes comparator 210 and transduction amplifier 220 (also can be described as the first transduction amplifier).The positive input terminal of comparator 210 is coupled to pin Pvout to receive output voltage V out, the negative input end of comparator 210 (inverting input) then is coupled to pin Psum, and the second end that is coupled to the first end of resistance R IMON and is coupled to the resistance R Y1 of current-sensing circuit CS1～CSn～RYn, and the negative input end of comparator 210 also can be coupled to the positive input terminal of transduction amplifier 220.The output of comparator 210 can be coupled to pin Pimon, and can be coupled to the second end of resistance R IMON, and the output of comparator 210 also can be coupled to the negative input end of transduction amplifier 220.Transduction amplifier 220 can be converted to the summed current detection signal Icsum of current forms with the voltage signal Vsum of positive input terminal and negative input end, and exports channel current balancing circuitry 115 to.
In n current channel, the voltage difference between pin Pvphn and Pvout is Vxn, that is the voltage difference at capacitor C Xn two ends is Vxn.Because be virtual short between the positive input terminal of comparator 210 and negative input end, the voltage at pin Psum place can equal the voltage at pin Pvout place, and makes the voltage difference at resistance R Yn two ends also be Vxn.Below will by inductance L n, resistance R Xn, capacitor C Xn, and the electric current of resistance R Yn be expressed as respectively ILn, IRXn, ICXn and IRYn, and the resistance value of capacitor C Xn and resistance R Xn and RYn is represented with cxn, rxn and ryn respectively.
Because the voltage at inductance L n two ends can equal the voltage that the voltage at resistance R Xn two ends adds capacitor C Xn two ends, that is ILn * (DCRn+S * LXn)=IRXn * rxn+Vxn, wherein S=j * ω.So the electric current I RXn=by resistance R Xn (ILn * DCRn+ILn * S * LXn-Vxn)/rxn, the electric current I CXn=Vxn by capacitor C Xn * S * cxn, and the electric current I RYn=Vxn/ryn by resistance R Yn.According to kirchhoff circuital law (Kirchhoff circuit laws), IRXn=ICXn+IRYn, so (ILn * DCRn+ILn * S * LXn-Vxn)/rxn=Vxn * S * cxn+Vxn/ryn.Therefore, Vxn=[(DCRn+S * LXn)/(1+rxn/ryn+S * cxn * rxn)] * ILn, and IRYn=[(DCRn+S * LXn)/(rxn+ryn+S * cxn * rxn * ryn)] * ILn.
By DCRn=Kn * (rxn+ryn) being set and LXn=Kn * cxn * rxn * ryn being set, Kn=DCRn/ (rxn+ryn) is constant, therefore can eliminate the S item in the above-mentioned equation, makes Vxn and IRYn become numerical value with frequency-independent.Current-sensing circuit CSn institute output current signal is IRYn=[DCR/ (rxn+ryn)] * ILn=Kn * ILn, and the voltage difference Vxn=[DCRn between pin Pvphn and Pvout * ryn/ (rxn+ryn)] * ILn=Kn * ryn * ILn, make IRYn and Vxn equal respectively the electric current I Ln multiplication by constants of n current channel.
The current signal IRY1 that summed current signal Isum is exported by current-sensing circuit CS1～CSn～IRYn adds up and forms, and by the same derivation of equation, summed current signal I sum=IRY1+IRY2...+IRYn=K1 * IL1+K2 * IL2...+Kn * ILn.The multiphase DC of present embodiment to direct current transducer 100 in, by resistance value DCR1=DCR2...=DCRn being set, inductance value LX1=LX2...=LXn is set, capacitance CX1=CX2...=CXn is set, resistance value rx1=rx2...=rxn is set and resistance value ry1=ry2...=ryn is set, and make K1=K2...=Kn=K.Therefore, summed current signal Isum=K * (IL1+IL2...+IL) is the summation multiplication by constants K of the channel current that all current channels supply.
When the resistance value of resistance R IMON is rimon, the voltage difference Vsum=Isum between pin Psum and Pimon * rimon=K * (IL1+IL2...+IL) * rimon then, and equal summation multiplication by constants K and the resistance value rimon of all channel current.Vsum also is the voltage difference of transduction amplifier 220 positive input terminals and negative input end, when the transduction value representation of transduction amplifier 220 is Gm220, transduction amplifier 220 is converted to the summed current detection signal Icsum=Gm220 * Vsum of current forms with voltage difference Vsum, and exports channel current balancing circuitry 115 to.
The functional block diagram of Fig. 3 after to be multiphase DC to an embodiment of the channel current change-over circuit 113 of direct current transducer 100 simplify.For making more simple and clear being easy to of drawing illustrate that some element, pin and signal among Fig. 3 are not illustrated among the figure.For example, transduction amplifier 310 (2)～310 (n-1) namely is not illustrated among the figure.
In the present embodiment, channel current change-over circuit 113 includes n transduction amplifier 310 (1)～310 (n) (also can be described as the second transduction amplifier), the first input end of each transduction amplifier 310 (1)～310 (n) is coupled to pin Pvout, and the second input of each transduction amplifier 310 (1)～310 (n) is respectively coupled to pin Pvph1～Pvphn one of them, with the channel current detection signal Iph1～Iphn of generation current form, and export channel current balancing circuitry 115 to.For example, the first input end of transduction amplifier 310 (n) is coupled to pin Pvout to receive output voltage V out, and the second input of transduction amplifier 310 (n) then is coupled to Pvphn to receive the detection signal Vphn of n channel current.As mentioned above, the first input end of transduction amplifier 310 (n) and the voltage difference Vxn=[DCRn of the second input * ryn/ (rxn+ryn)] * ILn=Kn * ryn * ILn, the electric current I Ln that voltage difference Vxn can equal n current channel is multiplied by fixing constant K n * ryn.When the transduction value of transduction amplifier 310 (n) was Gm310 (n), transduction amplifier 310 (n) can be converted to channel current detection signal Iphn=Gm310 (n) * Vxn with voltage difference Vxn, and exports channel current balancing circuitry 115 to.
The multiphase DC of present embodiment to direct current transducer 100 in, by resistance value DCR1=DCR2...=DCRn being set, inductance value LX1=LX2...=LXn is set, capacitance CX1=CX2...=CXn is set, resistance value rx1=rx2...=rxn is set and resistance value ry1=ry2...=ryn=ry is set, and make K1=K2...=Kn=K.Therefore, transduction amplifier 310 (1)～310 (n) can be converted to voltage difference Vx1...Vxn respectively the detection signal Iph1～Iphn of each channel current, to export channel current balancing circuitry 115 to.Wherein, Vx1=K * ry * I L1 ... Vxn=K * ry * ILn, and I ph1=Gm310 (1) * Vx1 ... Iphn=Gm310 (n) * Vxn.
The functional block diagram of Fig. 4 after to be multiphase DC to an embodiment of the channel current balancing circuitry 115 of direct current transducer 100 simplify.For making more simple and clear being easy to of drawing illustrate that some element, pin and signal among Fig. 4 are not illustrated among the figure.
Channel current balancing circuitry 115 can adopt various suitable algorithms to produce control signal Cug1～Cugn and Clg1～C1gn, and with difference power ratio control level PS1～PSn, and the electric current that each current channel is exported is more average.For example, the U.S. the 6th, 414, the method of the balance channel electric current that proposes in No. 470 patents can be by adopting summed current detection signal Icsum and channel current detection signal Iph1～Iphn, collocation reference voltage signal and sawtooth signal (or other periodic signal), and produce the pulse width modulation signal with power ratio control level PS1～PSn.
In Fig. 4, channel current balancing circuitry 115 includes resistance 510, comparator 530, pulse width modulation signal generating circuit 550 (1)～550 (n).In the present embodiment, summed current detection signal Icsum can produce voltage Vs by resistance 510, comparator 530 meeting comparative voltage Vs and reference voltage Vref are to produce error signal Vea, and pulse width modulation signal generating circuit 550 (1)～550 (n) meeting use error signal Vea, sawtooth signal Vramp and channel current detection signal Iph1～Iphn, and produce respectively control signal Cug1～Cugn and Clg1～Clgn, and pass through respectively pin Pug1～Pugn and pin Plg1～Plgn and upper bridge transistor UG1～UGn and the lower bridge transistor LG1～LGn of power ratio control level PS1～PSn.In addition, in other embodiments, also can use other suitable algorithm, to produce control control signal Cug1～Cugn and Clg1～Clgn.
In the above-described embodiment, because summed current signal Isum meeting Continuous-flow is through resistance R IMON, cause the temperature of resistance R IMON to rise and change resistance value, the detection signal that causes the detection signal of channel current and summed current is different from the derivation result of above-mentioned formula and error occurs.Therefore, among another embodiment, when resistance R IMON can increase resistance value along with the temperature rising, can adopt the thermistor RntC (Negative Temperature Coefficient Thermistor) of negative temperature coefficient to be parallel to resistance R IMON, namely be coupled between pin Psum and the Pimon.When the temperature of resistance R IMON rose, the resistance value of the thermistor Rntc of negative temperature coefficient can descend, so that the resistance value of resistance R IMON and Rntc parallel connection all can keep identical or close numerical value in default temperature range.The mode of the thermistor Rntc parallel resistance RIMON of use negative temperature coefficient is not only very simple, and can according to temperature the resistance value of resistance R IMON and Rntc parallel connection be remained near the default numerical value exactly.
Multiphase DC can adopt integer more than or equal to 2 to the number of active lanes n of direct current transducer 100 in the above-described embodiment, that is multiphase DC to direct current transducer 100 can be 2 phase DC-DC converters, 3 phase DC-DC converters ... N phase DC-DC converter.When selecting to use suitable number of active lanes n, the person of ordinary skill in the field should simply replace the execution modes such as above-mentioned signal indication mode, equation, circuit and function square.For example, adopt exactly two current-sensing circuit CS1 and CS2 when number of active lanes equals 2,2 phase DC-DC converters, illustrate current-sensing circuit CS2～CSn-1 and needn't explanation described above in Fig. 1 and 2, omit.
In the above-described embodiment, some signal only uses the form of voltage or electric current to represent, and some circuit or function square also only use the execution mode of voltage or electric current.Yet, unless specialize, the expression way of the form of these voltages or electric current or execution mode only are for explanation, but not in order to limit claim.For example, in another embodiment, channel current change-over circuit 113 also can receive path current sense signal Vph1～Vphn and output voltage V out, and produces the channel current detection signal of voltage form, and exports channel current balancing circuitry 115 to and carry out the running of balance channel electric current.In another embodiment, transduction amplifier 220 and/or 310 (1)～310 (n) also can adopt respectively the amplifier of voltage input and Voltage-output.
In the above-described embodiment, control device 110 is with the control signal of Uk and the Lk upper bridge transistor UGk of power ratio control level PSk and lower bridge transistor LGk (k=1～n) wherein respectively.In another embodiment, control device 110 can only be exported a control signal for each power stage PSk, and produces control signal with control transistor UGk and LGk (k=1～n) wherein by other signal processing circuit.For example, control device 110 can produce control signal PWMn with the transistor UGn of power ratio control level PSn, and control signal PWMn is produced control signal by circuit such as inverters (inverter), with control transistor LGn.
In the above-described embodiment, DCRn/ (rxn+ryn)=LXn/cxn * rxn * ryn=Kn only need be set, can be so that the output current IRYn of current-sensing circuit and channel current detection signal Vphn all become the form that the electric current I Ln of n current channel is multiplied by fixing constant.In addition, by resistance value DCR1=DCR2...=DCRn being set, inductance value LX1=LX2...=LXn is set, capacitance CX1=CX2...=CXn is set, resistance value rx1=rx2...=rxn is set and resistance value ry1=ry2...=ryn being set, and make K1=K2...=Kn=K, can be so that summed current signal Isum equals the summation multiplication by constants K of all channel currents.Therefore, control device 110 can use channel current detection signal Vph1～Vphn and summed current signal Isum, and the detection signal that produces the detection signal of each channel current and export the summed current of load Z to, and carry out the running of balance channel electric current.In addition, the selection of above-mentioned resistance value and/or capacitance is more flexible, therefore can and select suitable resistance value and capacitance according to the design consideration, and be arranged at respectively inside and/or the outside of control device 110.For example, can select the resistance R Yn of proper resistor value to be arranged at the inside of control device 110, and be coupled between pin Psum and the Pvphn.
In the above-described embodiment, various element connects and can consider and be arranged at inside or the outside of control device 110 according to design.For example, resistance 510 can be arranged at inside or the outside of control device 110, and also can adopt one or more circuit elements to implement.And power stage PS1～PSn also can be arranged at inside or the outside of control device 110, and each power stage can include one or more upper bridge transistors, and includes one or more lower bridge transistors.
In addition, in the above-described embodiment, transduction value Gm220 and Gm310 (1)～Gm310 (n) can according to design consider and select respectively greater than, be less than or equal to 1 numerical value.
By the above-mentioned derivation of equation as can be known, the above embodiments are coupled to the negative input end of amplifier 210 by the detection signal with each channel current, and can produce by the feedback path of resistance R IMON the detection signal Icsum of summed current, so that multiphase DC is more flexible to the circuit framework of direct current transducer 100.Therefore, multiphase DC is more flexible to the selection of the circuit element in the direct current transducer 100, and can perhaps implement in the mode of discrete elements according to designing consideration and some circuit element being arranged at IC interior, and can increase the elasticity of hardware designs.
In addition, in the above-described embodiments, also can adopt the mode of the thermistor Rntc parallel resistance RIMON of negative temperature coefficient to carry out temperature-compensating, change the impact of resistance value to reduce resistance R IMON because of variations in temperature.Therefore, temperature-compensating mechanism is not only accurate, and framework is also very simple.
Illustrating when graphic, the size of some element and relative size can be carried out amplification, so that graphic content can clearly be expressed.In addition, the shape of some element can be simplified conveniently to illustrate.Therefore, the shape of graphic middle each element that illustrates, size and relative size unless the applicant specializes, otherwise should not be used to limit scope of the present utility model.In addition, the utility model can embody with many different forms, when explaining the utility model, does not answer the aspect of the exemplary embodiment that limit proposes at this specification.
In the middle of specification and claim, used some vocabulary to censure specific element.The person of ordinary skill in the field should understand, and same element may be called with different nouns.This specification and follow-up claim are not used as distinguishing the mode of element with the difference of title, but the benchmark that is used as distinguishing with the difference of element on function.Be an open term mentioned " comprising " in the middle of specification and claim, so should be construed to " comprise but be not limited to ".In addition, " couple " word this comprise any directly and indirectly connect means.Therefore, be coupled to one second element if describe one first element in the literary composition, then represent this first element and can directly (comprise by signal connected modes such as electric connection or wireless transmission, optical delivery) and be connected in this second element, or by other element or connection means indirectly electrically or signal be connected to this second element.
Used herein " and/or " describing mode, comprise cited one of them or the combination in any of a plurality of projects.In addition, unless specialize, otherwise the term of any odd number lattice all comprises the connotation of plural lattice in this manual simultaneously.
The above only is the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model.
Claims (10)
1. a multiphase DC is to direct current transducer, in order to a load supplying, it is characterized in that including:
A plurality of power stages, each power stage include on one bridge transistor and bridge transistor once, and the output of each power stage is coupled to this load by an inductance respectively;
One first transduction amplifier, the positive input terminal of this first transduction amplifier and negative input end are respectively coupled to the two ends of a detecting resistance;
One comparator, the positive input terminal of this comparator is coupled to this load, and the negative input end of this comparator is coupled to the positive input terminal of this first transduction amplifier, and the output of this comparator is coupled to the negative input end of this first transduction amplifier;
A plurality of current-sensing circuits, each current-sensing circuit includes one first resistance, one second resistance and an electric capacity, wherein the first end of the first resistance is coupled to one of them output of these a plurality of power stages, the second end of the first resistance is coupled to the first end of electric capacity and the first end of the second resistance, the second end of electric capacity is coupled to this load, and the second end of the second resistance is coupled to the negative input end of this comparator;
One of them the second end, the first end of electric capacity and the first end of the second resistance of the first resistance that a plurality of channel current change-over circuits, the input of each channel current change-over circuit are coupled to this load and are coupled to these a plurality of current-sensing circuits; And
One channel current balancing circuitry, the input of this channel current balancing circuitry is coupled to the output of this first transduction amplifier and the output of these a plurality of channel current change-over circuits, and the output of this channel current balancing circuitry is coupled to this a plurality of power stages, with upper bridge transistor and the lower bridge transistor of controlling each power stage.
2. multiphase DC as claimed in claim 1 is to direct current transducer, the resistance value of the first resistance that it is characterized in that these a plurality of current-sensing circuits is identical, the resistance value of the second resistance of these a plurality of current-sensing circuits is identical, the capacitance of the electric capacity of these a plurality of current-sensing circuits is identical, and the inductance value of the inductance that couples of these a plurality of power stages is identical.
3. multiphase DC as claimed in claim 1 or 2 is characterized in that including in addition to direct current transducer:
The thermistor of one negative temperature coefficient is parallel to this detecting resistance, and is coupled between the positive input terminal and negative input end of this first transduction amplifier.
4. multiphase DC as claimed in claim 1 or 2 is to direct current transducer, it is characterized in that each channel current change-over circuit includes one second transduction amplifier, the first input end of this second transduction amplifier is coupled to this load, the second input is coupled to one of them the second end, the first end of electric capacity and the first end of the second resistance of the first resistance of these a plurality of current-sensing circuits, and output is coupled to the input of this channel current balancing circuitry.
5. multiphase DC as claimed in claim 1 or 2 is to direct current transducer, it is characterized in that this channel current balancing circuitry includes a plurality of pulse width modulation signal generating circuits, the output of each pulse width modulation signal generating circuit is coupled to one of them of these a plurality of power stages, with upper bridge transistor and the lower bridge transistor of controlling each power stage.
6. a multiphase DC is to the control device of direct current transducer, in order to control a multiphase DC to direct current transducer to a load supplying; It is characterized in that, this multiphase DC includes a detecting resistance to direct current transducer, a plurality of power stages and a plurality of current-sensing circuit, the output of each power stage is coupled to this load by an inductance respectively, and each current-sensing circuit includes one first resistance, one second resistance and an electric capacity, wherein the first end of the first resistance is coupled to one of them output of these a plurality of power stages, the second end of the first resistance is coupled to the first end of electric capacity and the first end of the second resistance, the second end of electric capacity is coupled to this load, and the second end of the second resistance is coupled to this control device; This control device includes:
One first transduction amplifier;
One comparator, the positive input terminal of this comparator is coupled to this load, the negative input end of this comparator is coupled to the positive input terminal of this first transduction amplifier and the second end that is coupled to the second resistance of each current-sensing circuit, and the output of this comparator is coupled to the negative input end of this first transduction amplifier;
A plurality of channel current change-over circuits, the input of each channel current change-over circuit is coupled to this load, and one of them the second end, the first end of electric capacity and the first end of the second resistance of the first resistance that is coupled to these a plurality of current-sensing circuits; And
One channel current balancing circuitry, the input of this channel current balancing circuitry is coupled to the output of this first transduction amplifier and the output of these a plurality of channel current change-over circuits, and the output of this channel current balancing circuitry is coupled to this a plurality of power stages, with these a plurality of power stages of control;
Wherein the two ends of this detecting resistance are respectively coupled to positive input terminal and the negative input end of this first transduction amplifier.
7. control device as claimed in claim 6 is characterized in that this multiphase DC includes in addition to direct current transducer:
The thermistor of one negative temperature coefficient is parallel to this detecting resistance, and the two ends of this thermistor are respectively coupled to positive input terminal and the negative input end of this first transduction amplifier.
8. such as claim 6 or 7 described control device, it is characterized in that each channel current change-over circuit includes one second transduction amplifier, the first input end of this second transduction amplifier is coupled to this load, the second input is coupled to one of them the second end, the first end of electric capacity and the first end of the second resistance of the first resistance of these a plurality of current-sensing circuits, and output is coupled to the input of this channel current balancing circuitry.
9. such as claim 6 or 7 described control device, it is characterized in that this channel current balancing circuitry includes a plurality of pulse width modulation signal generating circuits, the output of each pulse width modulation signal generating circuit is coupled to one of them of these a plurality of power stages, to control each power stage.
10. such as claim 6 or 7 described control device, it is characterized in that this multiphase DC includes on one bridge transistor and bridge transistor once to each power stage of direct current transducer, and this channel current balancing circuitry includes a plurality of pulse width modulation signal generating circuits, the output of each pulse width modulation signal generating circuit is coupled to one of them of these a plurality of power stages, with upper bridge transistor and the lower bridge transistor of controlling each power stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220164035 CN202652068U (en) | 2012-04-17 | 2012-04-17 | Multiphase DC-DC converter and relevant control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220164035 CN202652068U (en) | 2012-04-17 | 2012-04-17 | Multiphase DC-DC converter and relevant control device |
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| CN202652068U true CN202652068U (en) | 2013-01-02 |
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| CN 201220164035 Expired - Lifetime CN202652068U (en) | 2012-04-17 | 2012-04-17 | Multiphase DC-DC converter and relevant control device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242642A (en) * | 2014-09-12 | 2014-12-24 | 武汉新芯集成电路制造有限公司 | Current balance circuit with double-phase voltage reduction converter |
| CN109586562A (en) * | 2017-09-29 | 2019-04-05 | 力智电子股份有限公司 | Multiphase DC is to DC controller |
| 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 |
-
2012
- 2012-04-17 CN CN 201220164035 patent/CN202652068U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242642A (en) * | 2014-09-12 | 2014-12-24 | 武汉新芯集成电路制造有限公司 | Current balance circuit with double-phase voltage reduction converter |
| CN109586562A (en) * | 2017-09-29 | 2019-04-05 | 力智电子股份有限公司 | Multiphase DC is to DC controller |
| CN109586562B (en) * | 2017-09-29 | 2021-03-16 | 力智电子股份有限公司 | Multiphase DC-DC controller |
| 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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