CN102761253B - Control device and method of buck/boost converter - Google Patents
Control device and method of buck/boost converter Download PDFInfo
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- CN102761253B CN102761253B CN201110103857.2A CN201110103857A CN102761253B CN 102761253 B CN102761253 B CN 102761253B CN 201110103857 A CN201110103857 A CN 201110103857A CN 102761253 B CN102761253 B CN 102761253B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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Abstract
One of embodiments of a control device provided by the invention comprises a signal generation circuit and a mode determination circuit. The signal generation circuit is used for generating a first control signal and a second control signal according to an output voltage of a buck/boost converter. The first control signal is used for controlling a first switch and a second switch of the buck/boost converter, so that the first switch and the second switch can not be conducted simultaneously. The second control signal is used for controlling a third switch and a fourth switch of the buck/boost converter, so that the third switch and the fourth switch can not be conducted simultaneously. When the duty ratio of the first control signal is larger than a first default value and the duty ratio of the second control signal is smaller than a second default value, the mode determination circuit is provided with the signal generation circuit, so that the first control signal and the second control signal generated by the signal generation circuit have the substantially same duty ratio.
Description
Technical field
The present invention has about a kind of control device, espespecially a kind of control device that can be used for step-down/up type transducer.
Background technology
Step-down/up type transducer (buck-boost converter) consists predominantly of three kinds of operating modes, be boost mode (boost mode), decompression mode (buck mode) and buck pattern (buck-boost mode), and can provide according to the setting of control signal lower than input voltage, than input voltage high or identical in fact with input voltage output voltage.
In the time of boost mode, step-down/up type transducer receives lower input voltage, and the higher output voltage of output.In the time of decompression mode, step-down/up type transducer receives higher input voltage, and the lower output voltage of output.In the time of buck pattern, that step-down/up type transducer can provide is lower than input voltage, high or identical in fact with the input voltage output voltage than input voltage.
But in the time of step-down/up type transducer switch mode, the output voltage of step-down/up type transducer there will be ripple (ripple), and can impact the usefulness of the device that receives this output voltage, even can make this device cannot normal operation.
Summary of the invention
In view of this, in the time of step-down/up type transducer switch mode, how to reduce the ripple of the output voltage of step-down/up type transducer, in fact for industry has problem to be solved.
The invention provides an a kind of embodiment of the control device that can be used for step-down/up type transducer, include: a signal generating circuit, produce one first, 1 second, 1 the 3rd and one the 4th control signal in order to the output voltage according to a type of voltage step-up/down converter, to control respectively one first, 1 second, 1 the 3rd and one the 4th switch of this type of voltage step-up/down converter; An and pattern decision-making circuit, when the duty ratio of this first control signal is greater than one first default value, and when the duty ratio of the 3rd control signal is less than second default value, in order to this signal generating circuit to be set, make this first control signal and the 3rd control signal that this signal generating circuit produces there is same duty cycle in fact, and this second control signal have identical in fact duty ratio with the 4th control signal; Wherein, not simultaneously this first switch of conducting and this second switch of this first control signal and this second control signal, and the 3rd control signal and the 4th control signal can while conducting the 3rd switch and the 4th switches.
The invention provides another embodiment of a kind of control device that can be used for step-down/up type transducer, include: one first comparison circuit, in order to one first feedback signal producing according to a period 1 property signal with according to an output voltage of a type of voltage step-up/down converter, produce one first control signal and one second control signal, to control respectively one first switch and a second switch of this type of voltage step-up/down converter, one second comparison circuit, in order to according to a property second round signal and one second feedback signal that produces according to this output voltage, produces one the 3rd control signal and one the 4th control signal, to control respectively one the 3rd and 1 the 4th switch of this type of voltage step-up/down converter, and one the 3rd comparison circuit, in order to according to a period 3 property signal and one the 3rd feedback signal that produces according to this output voltage, produce one the 5th, 1 the 6th, one the 7th and 1 the 8th control signal, with control respectively this type of voltage step-up/down converter this first, this second, the 3rd and the 4th switch, wherein, not simultaneously this first switch of conducting and this second switch of this first control signal and this second control signal, not simultaneously conducting the 3rd switch and the 4th switch of the 3rd control signal and the 4th control signal, the duty ratio of the 5th control signal is identical in fact with the duty ratio of the 7th control signal, the duty ratio of the 6th control signal is identical in fact with the duty ratio of the 8th control signal, not simultaneously this first switch of conducting and this second switch of the 5th control signal and the 6th control signal, not and conducting the 3rd switch and the 4th switch simultaneously of the 7th control signal and the 8th control signal.
The invention provides another embodiment of a kind of control device that can be used for step-down/up type transducer, include: a signal generating circuit, produce one first control signal in order to the output voltage according to a type of voltage step-up/down converter, to control one first switch and a second switch of this type of voltage step-up/down converter and to produce one second control signal, to control one the 3rd switch and one the 4th switch of this type of voltage step-up/down converter; An and pattern decision-making circuit, when the duty ratio of this first control signal is greater than one first default value, and when the duty ratio of this second control signal is less than second default value, in order to this signal generating circuit to be set, make this first control signal and this second control signal that this signal generating circuit produces there is identical in fact duty ratio; Wherein, not simultaneously this first switch of conducting and this second switch of this first control signal, and this second control signal can while conducting the 3rd switch and the 4th switch.
The invention provides another embodiment of a kind of control device that can be used for step-down/up type transducer, include: one first comparison circuit, produce one first control signal in order to one first feedback signal producing according to a period 1 property signal with according to an output voltage of a type of voltage step-up/down converter, to control one first switch and a second switch of this type of voltage step-up/down converter; One second comparison circuit, in order to according to a property second round signal and produce according to this output voltage one second feedback signal produce one second control signal, to control one the 3rd and 1 the 4th switch of this type of voltage step-up/down converter; And one the 3rd comparison circuit, in order to according to a period 3 property signal and one the 3rd feedback signal that produces according to this output voltage, produce one the 3rd control signal, to control this first switch and this second switch of this type of voltage step-up/down converter and to produce one the 4th signal processed, to control the 3rd switch and the 4th switch of this type of voltage step-up/down converter; Wherein, not simultaneously this first switch of conducting and this second switch of this first control signal, not simultaneously conducting the 3rd switch and the 4th switch of the second control signal, not simultaneously this first switch of conducting and this second switch of the 3rd control signal, and the 4th control signal can while conducting the 3rd switch and the 4th switch.
One of advantage of above-described embodiment is that the ripple of output voltage can reduce in the time of step-down/up type transducer switch mode.Other advantage of the present invention will be described in detail by the following description and diagram.
Brief description of the drawings
Fig. 1 is the circuit diagram after the simplification of step-down/up type transducer.
Fig. 2 is the functional-block diagram after an embodiment of control device of the present invention simplifies.
Fig. 3 is the circuit diagram after the simplification of an embodiment of the feedback signal processing circuit in Fig. 2.
Fig. 4 is the circuit diagram after the simplification of control signal in Fig. 2 embodiment that produces circuit.
Fig. 5 to Fig. 8 produces the oscillogram after the simplification of the reference signal that produces of circuit for control signal.
[main element symbol description]
100 step-down/up type transducers
111,112,113,114 switches
130,150 electric capacity
170 inductance
200 control device
210 feedback signal processing circuit
230 Waveform generating circuits
250 pattern decision-making circuits
270 control signals produce circuit
211,212 resistance
213 comparison circuits
214 voltage sources
410,430,450 comparison circuits
470 voltage-regulating circuits
490 signal selecting circuits.
Embodiment
Below will coordinate correlative type that embodiments of the invention are described.In graphic, identical label represents same or similar element or process step.
In the middle of specification and claims, use some vocabulary to censure specific element.Person of ordinary skill in the field should understand, and same element may be called with different nouns.This specification and follow-up claims are not used as distinguishing the mode of element with the difference of title, but the difference in function is carried out the benchmark as distinguishing taking element.In the whole text, in the middle of specification and follow-up claims, be an open term mentioned " comprising ", therefore should be construed to " comprise but be not limited to ".In addition, " coupling " word comprises directly any and indirectly connects means.Therefore, be coupled to the second device if describe first device in literary composition, represent that first device can directly connect (comprising by signal connected modes such as electric connection, wire transmission, wireless transmission or optical delivery) in this second device, or by other device or connection means indirectly electrically or signal be connected to this second device.
In specification and accompanying drawing, the quantity of each element, position and annexation etc. are only schematically narration and drafting, with simplified illustration.Person of ordinary skill in the field should understand, and in specification, each element can be implemented with one or more elements, or in specification, the function of multiple elements also can be implemented by identity element, and all belongs to covering scope of the present invention.In specification and accompanying drawing, some signal, element, circuit, flow process or method of operation etc. are only described in the mode of voltage or electric current, but person of ordinary skill in the field should understand, with the execution mode of voltage pattern and current forms, all can reach by suitable conversion effect of the present invention.For example, if (narrate some numerical value in specification and claims; the numerical value such as the magnitude of voltage of signal, current value, duty ratio) when identical; person of ordinary skill in the field should understand; because the impact such as error and appointed condition in process conditions, design; and cause this little numerical value may be slightly in the time implementing different and still can reach effect of the present invention, also should belong to the protection range of this patent.
Fig. 1 is the circuit diagram after step-down/up type transducer 100 is simplified.Step-down/up type transducer 100 includes switch 111,112,113 and 114, electric capacity 130 and 150, and inductance 170.Step-down/up type transducer 100 can export load Z to after input voltage vin being converted to output voltage V out.
The mode such as switch and/or mechanical switch that switch 111,112,113 and 114 can adopt various diodes, transistor, active and/or passive electronic component to form realizes.Switch 111,112,113 and 114 presents respectively conducting or the state of conducting not according to control signal S1, S2, S3 and S4.In another embodiment, the conducting state of switch and not conducting state can be only the state of relativity.For example, in one embodiment, switch is realized with transistor, during compared to switch in conducting state, when switch is during in conducting state not, only can conducting one relatively go up less electric current, and has and relatively go up larger impedance.Therefore, switch is in conducting state or not necessarily do not have the restrictive condition such as electric current or impedance when conducting state, and can be only relative conducting state and conducting state not.
Control signal S1, S2, S3 and S4 all express with simplified illustration in effective (active high) mode of high state in this manual, be the level of control signal while being greater than a default value (being high level hereinafter referred to as control signal), switch will present conducting state; And control signal is while being less than this default value (being low level hereinafter referred to as control signal), switch will present not conducting state.In addition, unless otherwise noted, other signal in this specification is also expressed with simplified illustration in the effective mode of high state.In other embodiments, each signal can be all effective with high state, low state effectively (active low) or use respectively high state effectively and the effective mode of low state implement.
As shown in Figure 1, in the time that step-down/up type transducer 100 operates, input capacitance 130 is coupled to input voltage vin, switch 111 is coupled between electric capacity 130 and inductance 170, switch 112 is coupled between switch 111 and electric capacity 130, switch 113 is coupled between inductance 170 and switch 112, switch 114 is coupled between inductance 170 and electric capacity 150, inductance 170 is coupled between switch 111 and switch 114, electric capacity 150 is coupled between switch 113 and switch 114, and load Z is coupled to the two ends of electric capacity 150 to receive output voltage V out.
When control signal S1 is high level and control signal S2 is low level, switch 111 presents conducting state and switch 112 presents not conducting state.Now, switch 113 and 114 is carried out to conducting state and the not switching of conducting state according to control signal S3 and S4, can make step-down/up type transducer 100 operate on boost mode, and the output voltage V out higher than input voltage vin is provided.
When control signal S3 is low level and control signal S4 is high level, switch 113 presents not conducting state and switch 114 presents conducting state.Now, switch 111 and 112 is carried out to conducting state and the not switching of conducting state according to control signal S1 and S2, can make step-down/up type transducer 100 operate on decompression mode, and the output voltage V out lower than input voltage vin is provided.
When switch 111,112,113 and 114 all carries out conducting state according to control signal S1, S2, S3 and S4 and not when the switching of conducting state, can make step-down/up type transducer 100 operate on buck pattern, and can provide lower than input voltage, than input voltage high or identical in fact with input voltage output voltage.
Fig. 2 is the functional-block diagram after the control device 200 of one of embodiments of the invention is simplified, and below the Fig. 1 that arranges in pairs or groups with Fig. 2 is further illustrated to the function mode of control device 200.As shown in Figure 2, in the time that control device 200 operates, the output voltage V out of control device 200 meeting sensing step-down/up type transducers 100, and provide control signal S1, S2, S3 and S4 to step-down/up type transducer 100, with the conducting state of control switch 111,112,113 and 114 and conducting state not.
Control device 200 includes feedback signal processing circuit 210, Waveform generating circuit 230, pattern decision-making circuit 250 and control signal and produces circuit 270.
Feedback signal processing circuit 210 is in order to receive the output voltage V out of step-down/up type transducer 100, to produce reference signal Vc.230 of Waveform generating circuits are in order to produce reference signal Vg1 and Vg2.Pattern decision-making circuit 250 is in order to judge whether step-down/up type transducer 100 needs switch mode, and exports corresponding control signal BB, BB1 and BB2 to control signal and produce circuit 270.Control signal produces circuit 270 in order to according to reference signal Vc, Vg1 and Vg2, and according to control signal BB, BB1 and BB2, and generation control signal S1, S2, S3 and S4, in order to export step-down/up type transducer 100 to, the conducting state of control switch 111,112,113 and/or 114 and not conducting state.
In the present embodiment, the output voltage V out of step-down/up type transducer 100 is sent to feedback signal processing circuit 210.Feedback signal processing circuit 210, according to the output voltage V out of step-down/up type transducer 100, produces reference signal Vc.For example, feedback signal processing circuit 210 can produce reference signal Vc=A × Vout+B, wherein parameter A and B can be set to respectively zero, suitably positive number and/or the negative of numerical value.
In another embodiment, feedback signal processing circuit 210 is according to the current signal I in output voltage V out and the step-down/up type transducer 100 of step-down/up type transducer 100, and adopts other mode to produce one or more reference signal Vc.Current signal I can adopt by the combination of the electric current of inductance 170, electric current by switch 111,112,113 and/or 114 or the current value by various elements.For example, feedback signal processing circuit 210 can produce signal Vc=∑ (An × Vout
n+ Bn × I
n)+C, wherein parameter n, An, Bn and C can be set to respectively zero, suitably positive number and/or the negative of numerical value.
In another embodiment, can the output voltage V out of step-down/up type transducer 100 is (not shown in the figures through another signal processing circuit, can be arranged at inside or the outside of control device 200) process after, be resent to feedback signal processing circuit 210, to produce reference signal Vc.
Fig. 3 is the simplified electrical circuit diagram of an embodiment of feedback signal processing circuit 210, and in the embodiments of figure 3, feedback signal processing circuit 210 includes resistance 211 and 212, comparison circuit 213 and reference voltage source 214.Resistance 211 and 212, comparison circuit 213 and reference voltage source 214 can use various actives and/or passive element to form, or reference voltage source 214 also can directly be coupled to needed reference level.For example, comparison circuit 213 can adopt differential amplifier and/or resistance 211 and 212 can adopt the modes such as transistor to implement.
Output voltage V out is coupled to ground through resistance 211 and 212, and the voltage after resistance 211 and 212 dividing potential drops is sent to an input of comparison circuit 213.Reference voltage source 214 can provide the voltage of Vrc, and is coupled to another input of comparison circuit 213.Therefore, in the present embodiment, the output of comparison circuit 213 can provide reference signal Vc=C × (Vrc-D × Vout), wherein parameters C and D can be respectively according to design consider to be set to zero, suitably positive number and/or the negative of numerical value, and corresponding resistance 211 and 212 and comparison circuit 213 of arranging.
In the present embodiment, one end of resistance 212 and reference voltage source 214 is all coupled to ground.In another embodiment, one end of resistance 212 and reference voltage source 214 can be coupled to respectively identical or different default level.In another embodiment, a default level (for example, earth terminal or other default level) is sent to an input of comparison circuit 213.And output voltage V out couples reference voltage source 214 through resistance 211 and 212, and the voltage after resistance 211 and 212 dividing potential drops is sent to another input of comparison circuit 213, to provide reference signal Vc in the output of comparison circuit 213.
The oscillator signal that Waveform generating circuit 230 can be exported according to oscillating circuit or according to frequency signal, the circuit that coordinates active and/or passive element to form, to produce needed one or more periodic reference signal, reference signal can be set to have triangular wave, sawtooth waveforms, string ripple or the periodic signal of any tool of proper signal value, and the parameter such as the cycle of reference signal, peak-to-peak value voltage (peak-to-peakvoltage) and/or waveform can be set to fixing or be set to capable of regulating.In the present embodiment, the reference signal Vg1 that Waveform generating circuit 230 produces and Vg2 are set to cycle, peak-to-peak value voltage and waveform etc. and have at least a parameter not identical.In another embodiment, Waveform generating circuit 230 is set to produce multiple while having periodic reference signal, and these reference signals can be set to respectively have the parameters such as identical or different cycle, peak-to-peak value voltage and/or waveform.
Pattern decision-making circuit 250 is in order to judge whether step-down/up type transducer 100 needs switch mode, to produce corresponding control signal BB, BB1 and BB2 to control signal generation circuit 270, make control signal produce circuit 270 and can export control signal S1, S2, S3 and the S4 corresponding to proper handling pattern according to control signal BB, BB1 and/or BB2.
In one embodiment, pattern decision-making circuit 250 can be according to the input voltage vin of step-down/up type transducer 100 and output voltage V out to produce control signal BB.For example, as (Vout-Vin) < Vrbb1 or (Vin-Vout) when < Vrbb2, pattern decision-making circuit 250 produces the control signal BB corresponding to buck pattern, makes control signal produce circuit 270 and can export control signal S1, S2, S3 and the S4 corresponding to buck pattern according to control signal BB.Wherein, reference voltage Vrbb1 and Vrbb2 can be set to identical or different suitable numerical value.For example, in the time that Vrbb1 and Vrbb2 are all set to 0.1 volt, in the time that the difference of input voltage vin and output voltage V out is less than 0.1 volt, pattern decision-making circuit 250 corresponding to the control signal BB of buck pattern (for example produces, BB is set to high level), make control signal produce circuit 270 and can export control signal S1, S2, S3 and the S4 corresponding to buck pattern according to control signal BB.
In another embodiment, pattern decision-making circuit 250 can be according to the duty ratio of control signal S1, S2, S3 and S4 (duty cycle), to produce control signal BB1 and/or BB2.Duty ratio represents that control signal S1, S2, S3 and S4 can make switch present time of conducting state, compared to the proportion of one-period time of control signal S1, S2, S3 and S4.Therefore, the numerical value of duty ratio is less than or equal to 1 and be more than or equal to 0.
For example, step-down/up type transducer 100 operates in boost mode, and switch 111 presents conducting state and switch 112 presents not conducting state, represents that control signal S1 is high level and control signal S2 is low level, the duty ratio that is control signal S1 equals 1, and the duty ratio of control signal S2 equals 0.Therefore in the time that the duty ratio of control signal S3 is less than default value Ds3bt, pattern decision-making circuit 250 corresponding to the control signal BB1 of buck pattern (for example produces, BB1 is set to high level), make control signal produce circuit 270 and can export control signal S1, S2, S3 and the S4 corresponding to buck pattern according to control signal BB1.
In another embodiment, when step-down/up type transducer 100 operates in boost mode, can be according to the consideration in design, and the duty ratio of control signal S1 is set to be not equal to 1.For example, the duty ratio of control signal S1 is set to be more than or equal to 0.99.
For example, in one embodiment, in the time that step-down/up type transducer 100 operates in boost mode, when the duty ratio of control signal S 1 is more than or equal to 0.99, and when the duty ratio of S3 is less than default value Ds3bt=0.05, control signal BB1 is set to high level, makes control signal produce circuit 270 and exports control signal S1, S2, S3 and the S4 corresponding to buck pattern.
In another embodiment, step-down/up type transducer 100 operates in decompression mode, switch 113 presents not conducting state and switch 114 presents conducting state, represent that control signal S3 is low level and control signal S4 is high level, the duty ratio that is control signal S3 equals 0, and the duty ratio of control signal S4 equals 1.Therefore in the time that the duty ratio of control signal S1 is greater than default value Ds1bk, pattern decision-making circuit 250 corresponding to the control signal BB2 of buck pattern (for example produces, BB2 is set to high level), make control signal produce circuit 270 and can export control signal S1, S2, S3 and the S4 corresponding to buck pattern according to control signal BB2.
In another embodiment, when step-down/up type transducer 100 operates in decompression mode, can be according to the consideration in design, and the duty ratio of control signal S3 is set to be not equal to 0.For example, the duty ratio of control signal S3 is set to be less than or equal to 0.01.
For example, in one embodiment, in the time that step-down/up type transducer 100 operates in decompression mode, when the duty ratio of control signal S3 is less than or equal to 0.01, and when the duty ratio of S1 is greater than default value Ds1bk=0.95, control signal BB2 is set to high level, makes control signal produce circuit 270 and exports control signal S1, S2, S3 and the S4 corresponding to buck pattern.
In another embodiment, when step-down/up type transducer 100 operates in buck pattern, in the time that the duty ratio of control signal S1 is less than default value Ds1bb1, and when the duty ratio of control signal S3 is less than default value Ds3bb1, pattern decision-making circuit 250 corresponding to the control signal BB1 of decompression mode (for example produces, BB1 is set to low level), make control signal produce circuit 270 and can export control signal S1, S2, S3 and the S4 corresponding to decompression mode according to control signal BB1.Default value Ds1bb1 and default value Ds3bb1 can be set to identical or different numerical value.
For example, in one embodiment, when step-down/up type transducer 100 operates in buck pattern, when the duty ratio of control signal S1 is less than Ds1bb1=0.47, and when the duty ratio of S3 is less than default value Ds3bb1=0.47, control signal BB1 is set to low level, and makes control signal generation circuit 270 export control signal S1, S2, S3 and the S4 corresponding to decompression mode.
In another embodiment, when step-down/up type transducer 100 operates in buck pattern, in the time that the duty ratio of control signal S1 is greater than default value Ds1bb2, and when the duty ratio of control signal S3 is greater than default value Ds3bb2, pattern decision-making circuit 250 corresponding to the control signal BB2 of boost mode (for example produces, BB2 is set to low level), make control signal produce circuit 270 and can export control signal S1, S2, S3 and the S4 corresponding to boost mode according to control signal BB2.Default value Ds1bb2 and default value Ds3bb2 can be set to identical or different numerical value.
For example, in one embodiment, when step-down/up type transducer 100 operates in buck pattern, when the duty ratio of control signal S1 is greater than Ds1bb2=0.53, and when the duty ratio of S3 is greater than default value Ds3bb2=0.53, control signal BB2 is set to low level, and makes control signal generation circuit 270 export control signal S1, S2, S3 and the S4 corresponding to boost mode.
In another embodiment, pattern decision-making circuit 250 can produce control signal BB, BB1, BB2 and other and judge whether control signal one or more of switch mode, make control signal produce circuit 270 can be according to control signal BB2 output control signal S1, S2, S3 and the S4 corresponding to buck pattern.
In the present embodiment, in the time that control signal BB, BB1 and/or BB2 are high level, control signal produces circuit 270 should export control signal S1, S2, S3 and the S4 corresponding to buck pattern.In another embodiment, control signal BB, BB1 and/or BB2 can be set respectively be high level or low level time, control signal produces circuit 270 should export control signal S1, S2, S3 and the S4 corresponding to boost mode, decompression mode or buck pattern.
Fig. 4 is the simplified electrical circuit diagram of an embodiment that control signal produces circuit 270, and control signal produces circuit 270 and includes comparison circuit 410,430 and 450, voltage-regulating circuit 470 and signal selecting circuit 490.Control signal produces circuit 270 in order to according to reference signal Vc, Vg1 and Vg2, and according to control signal BB, BB1 and/or BB2, and produce control signal S1, S2, S3 and S4.
The reference signal Vg1 that the reference signal Vc that comparison circuit 410 provides in order to receiving feedback signals treatment circuit 210 and Waveform generating circuit 230 provide, in the time that reference signal Vc is greater than reference signal Vg1, comparison circuit 410 produces control signal T1 and the low level control signal T2 of high level.In the time that reference signal Vc is less than reference signal Vg1, comparison circuit 410 produces the control signal T2 of low level control signal T1 and high level.
In another embodiment, in the time that reference signal Vc is greater than reference signal Vg1, comparison circuit 410 is set to produce the control signal T2 of low level control signal T1 and high level.In the time that reference signal Vc is less than reference signal Vg1, produce control signal T1 and the low level control signal T2 of high level.In addition, in comparison circuit 430 and 450, also can adopt this kind of mode to produce control signal T3 to T8.Comparison circuit 410,430 and 450 can adopt pulse width modulation device (pulse width modulator), amplifier and/or other comparison circuit being made up of active or passive device.
The reference signal Vc that voltage-regulating circuit 470 receiving feedback signals treatment circuits 210 provide, and export reference signal Vc1=Vc+Vsh, in the present embodiment, be set to a negative voltage of the peak-to-peak value voltage that is greater than reference signal Vg1 with reference to the difference Vsh between signal Vc and Vc1.In another embodiment, Vsh can be set to positive voltage or the negative voltage of zero level, suitable numerical value.Voltage-regulating circuit 470 can adopt voltage source, current source collocation initiatively and/or passive device and/or other circuit being made up of active member and/or passive device, so that required reference signal Vc1 to be provided.
The reference signal Vg1 that the reference signal Vc1 that comparison circuit 430 provides in order to receiver voltage Circuit tuning 470 and Waveform generating circuit 230 provide, in the time that reference signal Vc1 is greater than reference signal Vg1, produce control signal T3 and the low level control signal T4 of high level.In the time that reference signal Vc1 is less than reference signal Vg1, produce the control signal T4 of low level control signal T3 and high level.
The reference signal Vg2 that the reference signal Vc that comparison circuit 450 provides in order to receiving feedback signals treatment circuit 210 and Waveform generating circuit 230 provide, in the time that reference signal Vc is greater than reference signal Vg2, produce control signal T5 and the low level control signal T6 of high level, and the control signal T7 of high level and low level control signal T8.In the time that reference signal Vc is less than reference signal Vg2, produce the control signal T6 of low level control signal T5 and high level, and the control signal T8 of low level control signal T7 and high level.In addition, the control signal T5 that comparison circuit 450 provides and T7 have identical in fact duty ratio, and control signal T6 and T8 have an identical in fact duty ratio.
Signal selecting circuit 490 can be according to control signal BB, BB1 and/or BB2, and control signal T1, T2, T3 and T4 are output as respectively to control signal S1, S2, S3 and S4, or control signal T5, T6, T7 and T8 are output as respectively to control signal S1, S2, S3 and S4.In the present embodiment, in the time that control signal BB, BB1 and/or BB2 are shown as boost mode or decompression mode, control signal T1, T2, T3 and T4 are output as respectively control signal S1, S2, S3 and S4 by signal selecting circuit 490.And show that should operate in buck pattern time, control signal T5, T6, T7 and T8 are output as respectively control signal S1, S2, S3 and S4 by signal selecting circuit 490 as control signal BB, BB1 and/or BB2.In another embodiment, when signal selecting circuit 490 is shown as boost mode, decompression mode or buck pattern for control signal BB, BB1 and/or BB2, respectively control signal T1, T2, T3 and T4 or control signal T5, T6, T7 and T8 are output as to control signal S1, S2, S3 and S4.
In another embodiment, signal selecting circuit 490 is arranged at the outside of control device 200, by control device 200, control signal T1 to T8 and control signal BB, BB1 and/or BB2 are exported to after signal selecting circuit 490, then export suitable control signal S1 to S4 to type of voltage step-up/down converter 100 by signal selecting circuit 490.
In another embodiment, pattern decision-making circuit 250 and signal selecting circuit 490 are all arranged at the outside of control device 200, control device 200 by control signal T1 to T8 to export to after pattern decision-making circuit 250 and signal selecting circuit 490, pattern decision-making circuit 250 is by control signal BB, BB1 and/or BB2 are sent to signal selecting circuit 490, signal selecting circuit 490 is for control signal BB, BB1 and/or BB2 are shown as boost mode, decompression mode or buck pattern, and by control signal T1, T2, T3 and T4 or control signal T5, T6, T7 and T8 are output as control signal S1, S2, S3 and S4.
In the above-described embodiments, can be by reference signal Vc, Vc1, Vg1, Vg2 and/or relevant circuit are set, and the duty ratio of the suitable duty ratio that control signal T1 to T4 is set and control signal T5 to T8, while making step-down/up type transducer 100 switch mode, can reduce the ripple of output voltage V out.
For example, in one embodiment, when step-down/up type transducer 100 operates in boost mode, when the duty ratio of control signal S1 is more than or equal to 0.99, and the duty ratio of S3 is while being less than or equal to default value Ds3bt=0.05, and control signal BB1 is set to high level.And in the time that the duty ratio of S3 equals 0.05, comparison circuit 450 is set to produce control signal T5 and the T7 that duty ratio equals 0.513, and make control signal generation circuit 270 that control signal T5 to T8 is output as to control signal S1 to S4, so that step-down/up type transducer 100 operates in buck pattern.
In another embodiment, when step-down/up type transducer 100 operates in decompression mode, when the duty ratio of control signal S3 is less than or equal to 0.01, and the duty ratio of S1 is while being more than or equal to default value Ds1bk=0.95, and control signal BB2 is set to high level.And in the time that the duty ratio of S1 equals 0.95, comparison circuit 450 is set to produce control signal T5 and the T7 that duty ratio equals 0.487, and make control signal generation circuit 270 that control signal T5 to T8 is output as to control signal S1 to S4, so that step-down/up type transducer 100 operates in buck pattern.
By the oscillogram after the simplification of the Fig. 5 to Fig. 8 that arranges in pairs or groups with Fig. 4, further illustrate the function mode of control signal generation circuit 270 below.
In the oscillogram of Fig. 5, reference signal Vc is between the maximum and minimum value of reference signal Vg1, and reference signal Vc1 is always less than reference signal Vg1, and control signal BB, BB1 and/or BB2 show the buck pattern that do not enter.Now, comparison circuit 410 produces periodic control signal T1 and T2, and comparison circuit 430 produces the control signal T4 of low level control signal T3 and high level.Signal selecting circuit 490 is according to control signal BB, BB1 and/or BB2, and control signal T1, T2, T3 and T4 are output as to control signal S1, S2, S3 and S4, and type of voltage step-up/down converter 100 is operated in decompression mode.
In the oscillogram of Fig. 6, reference signal Vc is always greater than reference signal Vg1, and reference signal Vc1 is between the maximum and minimum value of reference signal Vg1, and control signal BB, BB1 and/or BB2 show the buck pattern that do not enter.Now, comparison circuit 410 produces control signal T1 and the low level control signal T2 of high level, and comparison circuit 430 produces periodic control signal T3 and T4.Signal selecting circuit 490 is according to control signal BB, BB1 and/or BB2, and control signal T1, T2, T3 and T4 are output as to control signal S1, S2, S3 and S4, and type of voltage step-up/down converter 100 is operated in boost mode.
In the oscillogram of Fig. 7, reference signal Vc is between the maximum and minimum value of reference signal Vg1, and reference signal Vc1 is always less than reference signal Vg1, but now control signal BB, BB1 and/or BB2 show and should operate in buck pattern.
In the oscillogram of Fig. 8, reference signal Vc is always greater than reference signal Vg1, and reference signal Vc1 is between the maximum and minimum value of reference signal Vg1, but now control signal BB, BB1 and/or BB2 show and should operate in buck pattern.
In addition, in Fig. 7 and Fig. 8, reference signal Vc is between the maximum and minimum value of reference signal Vg2, comparison circuit 450 is according to the relation of reference signal Vc and Vg2, produce periodic control signal T5, T6, T7 and T8, and the duty ratio of control signal T5 and T7 is set to identical, the duty ratio of control signal T6 and T8 is set to identical.Now, signal selecting circuit 490 is according to control signal BB, BB1 and/or BB2, and control signal T5, T6, T7 and T8 are output as to control signal S1, S2, S3 and S4, makes type of voltage step-up/down converter 100 operate in buck pattern.
In the above-described embodiments, can be by reference signal Vc, Vc1, Vg1 and/or Vg2 are set, and/or for example, by parameter in control signal BB, BB1 and/or BB2 being set (, the parameters such as reference voltage Vrbb1 and Vrbb2), make control signal produce circuit 270 and can export suitable control signal S1, S2, S3 and S4, to allow type of voltage step-up/down converter 100 operate in boost mode, decompression mode or buck pattern.
In another embodiment, type of voltage step-up/down converter 100 only operates in the two modes of appointing in boost mode, decompression mode and buck pattern, also can be by above-mentioned reference signal and/or control signal are set, make control signal produce circuit 270 and can export suitable control signal S1, S2, S3 and S4, to allow type of voltage step-up/down converter 100 operate in suitable pattern.
In another embodiment, feedback signal processing circuit 210 and Waveform generating circuit 230 can combine and change.For example, in feedback signal processing circuit 210, output voltage V out is carried out to computing with periodic signal, to produce the reference signal Vc with periodic waveform.Reference signal Vg1 and Vg2 can be set to respectively identical or different magnitude of voltage (for example, earth terminal or other default magnitude of voltage).Being sent to control signal with reference to signal Vc, Vg1 and Vg2 and control signal BB, BB1 and BB2 produces after circuit 270, make control signal produce circuit 270 and can export suitable control signal S1, S2, S3 and S4, to allow type of voltage step-up/down converter 100 operate in suitable pattern.
Due to control signal S1 and S2 simultaneously only can actuating switch 111 and 112 one of them, and control signal S3 and S4 simultaneously only can actuating switchs 113 and 114 one of them.Therefore, in another embodiment, control device 200 only produces two control signal S1 and S3, or only provide control signal S1 and S3 to type of voltage step-up/down converter 100, and use control signal S1 control switch 111 and 112, make switch 111 and 112 with the time only can conducting one of them, use control signal S3 control switch 113 and 114, make switch 113 and 114 with the time only can conducting one of them.
In another embodiment, control device 200 only produces one of them of control signal S1 and S2 and one of them of control signal S3 and S4, or only one of them of control signal S1 and S2 and one of them of control signal S3 and S4 is provided to type of voltage step-up/down converter 100.
In another embodiment, feedback signal processing circuit 210, Waveform generating circuit 230, pattern decision-making circuit 250 and/or signal selecting circuit 490 can be arranged to the outside of control device 200, and the coupling mode of suitable change signal, to use control signal S1, S2, S3 and S4 to control type of voltage step-up/down converter 100, allow type of voltage step-up/down converter 100 operate in suitable pattern.
In the above embodiments, control device 200 adopts reference signal Vc and Vg1 to produce control signal S1 to S4 in the time of boost mode or decompression mode, and adopts reference signal Vc and Vg2 to produce control signal S1 to S4 in buck pattern.By suitable reference signal Vc, Vg1, Vg2 and/or the relevant circuit of arranging, in the time that step-down/up type transducer 100 is converted to buck pattern by boost mode and/or decompression mode, can reduce the ripple of the output voltage V out of step-down/up type transducer 100.
In the above-described embodiment, whether control device 200 can adopt the difference of input voltage and output voltage in default scope, to judge whether step-down/up type transducer 100 being switched to another mode operating.Therefore, can change by the preset range that difference is set the opportunity of step-down/up type transducer 100 switch modes, make control device 200 there is very much in design elasticity.
In the above-described embodiment, control device 200 can adopt the duty of control signal S1, S2, S3 and/or S4 recently to judge whether step-down/up type transducer 100 is switched to another mode operating.Therefore,, can reduce the Rule of judgment using input voltage and/or output voltage as switch mode time, because of the misjudgment of floating and causing of magnitude of voltage, and can reduce the ripple of the output voltage V out of step-down/up type transducer 100.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change, modify and combination, all belong to covering scope of the present invention.
Claims (22)
1. a control device, includes:
One first comparison circuit, in order to one first feedback signal producing according to a period 1 property signal with according to an output voltage of a type of voltage step-up/down converter, produce one first control signal and one second control signal, to control respectively one first switch and a second switch of this type of voltage step-up/down converter;
One second comparison circuit, in order to according to a property second round signal and one second feedback signal that produces according to this output voltage, produces one the 3rd control signal and one the 4th control signal, to control respectively one the 3rd and 1 the 4th switch of this type of voltage step-up/down converter; And
One the 3rd comparison circuit, in order to according to a period 3 property signal and one the 3rd feedback signal that produces according to this output voltage, produce one the 5th, 1 the 6th, one the 7th and 1 the 8th control signal, with control respectively this type of voltage step-up/down converter this first, this second, the 3rd and the 4th switch;
Wherein, not simultaneously this first switch of conducting and this second switch of this first control signal and this second control signal, not simultaneously conducting the 3rd switch and the 4th switch of the 3rd control signal and the 4th control signal, the duty ratio of the 5th control signal is identical with the duty ratio of the 7th control signal, the duty ratio of the 6th control signal is identical with the duty ratio of the 8th control signal, not simultaneously this first switch of conducting and this second switch of the 5th control signal and the 6th control signal, not and conducting the 3rd switch and the 4th switch simultaneously of the 7th control signal and the 8th control signal.
2. control device as claimed in claim 1, separately comprises:
One signal selecting circuit, in order to select make this control device export this first, this second, the 3rd and the 4th control signal, or export the 5th, the 6th, the 7th and the 8th control signal, with control this first, this second, the 3rd and the 4th switch.
3. control device as claimed in claim 1, wherein this first, this second, the 3rd, the 4th, the 5th, the 6th, the 7th and the 8th control signal exports this type of voltage step-up/down converter to via a signal selecting circuit, this signal selecting circuit select output this first, this second, the 3rd and the 4th control signal, or select output the 5th, the 6th, the 7th and the 8th control signal, with control this first, this second, the 3rd and the 4th switch.
4. control device as claimed in claim 2 or claim 3, separately comprises:
One first mode decision-making circuit, when the duty ratio of this first control signal is greater than one first default value, and when the duty ratio of the 3rd control signal is less than second default value, in order to this signal selecting circuit to be set, make this control device with the 5th, the 6th, the 7th and the 8th control signal control this first, this second, the 3rd and the 4th switch.
5. control device as claimed in claim 4, wherein when the duty ratio of this first control signal is greater than one the 3rd default value, and when the duty ratio of the 3rd control signal is greater than the 4th default value, this first mode decision-making circuit arranges this signal selecting circuit, make this control device with this first, this second, the 3rd and the 4th control signal control this first, this second, the 3rd and the 4th switch.
6. control device as claimed in claim 4, wherein when the duty ratio of this first control signal is less than one the 5th default value, and when the duty ratio of the 3rd control signal is less than the 6th default value, this first mode decision-making circuit arranges this signal selecting circuit, make this control device with this first, this second, the 3rd and the 4th control signal control this first, this second, the 3rd and the 4th switch.
7. control device as claimed in claim 2 or claim 3, separately comprises:
One second pattern decision-making circuit, in the time that an input voltage of this step-down/up type transducer and the difference of this output voltage are positioned at a default scope, in order to this signal selecting circuit to be set, make this control device with the 5th, the 6th, the 7th and the 8th control signal control this first, this second, the 3rd and the 4th switch.
8. control device as claimed in claim 1, wherein this period 1 property signal is identical with this property second round signal, and this period 1 property signal is not identical with this period 3 property signal.
9. the control device as described in claim 1 or 8, wherein a signal difference of this period 1 property signal and this property second round signal is greater than the peak-to-peak value voltage of this first feedback signal and/or the peak-to-peak value voltage of this second feedback signal.
10. control device as claimed in claim 1, wherein this first feedback signal is not identical with this second feedback signal, and this first feedback signal is identical with the 3rd feedback signal.
11. control device as described in claim 1 or 10, wherein a signal difference of this first feedback signal and this second feedback signal is greater than the peak-to-peak value voltage of this period 1 property signal and/or the peak-to-peak value voltage of this property second round signal.
12. 1 kinds of control device, include:
One first comparison circuit, produces one first control signal in order to one first feedback signal producing according to a period 1 property signal with according to an output voltage of a type of voltage step-up/down converter, to control one first switch and a second switch of this type of voltage step-up/down converter;
One second comparison circuit, in order to according to a property second round signal and produce according to this output voltage one second feedback signal produce one second control signal, to control one the 3rd and 1 the 4th switch of this type of voltage step-up/down converter; And
One the 3rd comparison circuit, in order to according to a period 3 property signal and one the 3rd feedback signal that produces according to this output voltage, produce one the 3rd control signal, to control this first switch and this second switch of this type of voltage step-up/down converter and to produce one the 4th signal processed, to control the 3rd switch and the 4th switch of this type of voltage step-up/down converter;
Wherein, not simultaneously this first switch of conducting and this second switch of this first control signal, not simultaneously conducting the 3rd switch and the 4th switch of the second control signal, not simultaneously this first switch of conducting and this second switch of the 3rd control signal, and the 4th control signal can while conducting the 3rd switch and the 4th switch.
13. control device as claimed in claim 12, separately comprise:
One signal selecting circuit, in order to select output this first control signal and this second control signal, or exports the 3rd control signal and the 4th control signal, with control this first, this second, the 3rd and the 4th switch.
14. control device as claimed in claim 12, wherein this first, this second, the 3rd and the 4th control signal exports this type of voltage step-up/down converter to via a signal selecting circuit, this signal selecting circuit is selected this first control signal of output and this second control signal, or select output the 3rd control signal and the 4th control signal, with control this first, this second, the 3rd and the 4th switch.
15. control device as described in claim 13 or 14, separately comprise:
One first mode decision-making circuit, when the duty ratio of this first control signal is greater than one first default value, and when the duty ratio of this second control signal is less than second default value, in order to this signal selecting circuit to be set, make this control device with the 3rd control signal and the 4th control signal control this first, this second, the 3rd and the 4th switch.
16. control device as claimed in claim 15, wherein when the duty ratio of this first control signal is greater than one the 3rd default value, and when the duty ratio of this second control signal is greater than the 4th default value, this first mode decision-making circuit arranges this signal selecting circuit, make this control device with this first control signal and this second control signal control this first, this second, the 3rd and the 4th switch.
17. control device as claimed in claim 15, wherein when the duty ratio of this first control signal is less than one the 5th default value, and when the duty ratio of this second control signal is less than the 6th default value, this first mode decision-making circuit arranges this signal selecting circuit, make this control device with this first control signal and this second control signal control this first, this second, the 3rd and the 4th switch.
18. control device as described in claim 13 or 14, separately comprise:
One second pattern decision-making circuit, in the time that an input voltage of this step-down/up type transducer and the difference of this output voltage are positioned at a default scope, in order to this signal selecting circuit to be set, make this control device with the 3rd control signal and the 4th control signal control this first, this second, the 3rd and the 4th switch.
19. control device as claimed in claim 12, wherein this period 1 property signal is identical with this property second round signal, and this period 1 property signal is not identical with this period 3 property signal.
20. control device as described in claim 12 or 19, wherein a signal difference of this first feedback signal and this second feedback signal is greater than the peak-to-peak value voltage of this period 1 property signal and/or the peak-to-peak value voltage of this property second round signal.
21. control device as claimed in claim 12, wherein this first feedback signal is not identical with this second feedback signal, and this first feedback signal is identical with the 3rd feedback signal.
22. control device as described in claim 12 or 21, wherein a signal difference of this first feedback signal and this second feedback signal is greater than the peak-to-peak value voltage of this period 1 property signal and/or the peak-to-peak value voltage of this property second round signal.
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| CN201110103857.2A CN102761253B (en) | 2011-04-25 | 2011-04-25 | Control device and method of buck/boost converter |
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| TWI560985B (en) * | 2015-07-01 | 2016-12-01 | Anpec Electronics Corp | Buck-boost converter and control circuit thereof |
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| CN101944850A (en) * | 2009-07-06 | 2011-01-12 | 立锜科技股份有限公司 | Voltage step-up and down switching power circuit as well as control circuit and method thereof |
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