CN202713140U - Switch converter controlled by constant conduction time and control circuit thereof - Google Patents
Switch converter controlled by constant conduction time and control circuit thereof Download PDFInfo
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- CN202713140U CN202713140U CN 201220370701 CN201220370701U CN202713140U CN 202713140 U CN202713140 U CN 202713140U CN 201220370701 CN201220370701 CN 201220370701 CN 201220370701 U CN201220370701 U CN 201220370701U CN 202713140 U CN202713140 U CN 202713140U
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Abstract
The utility model relates to a switch converter of invariable on-time control and control circuit thereof. In an embodiment of the present invention, the reference signal is used to calculate the on-time instead of the output voltage. The switching converter comprises a switching circuit with at least one switching tube, the switching circuit converts an input voltage into an output voltage through the on and off of the at least one switching tube, and is characterized in that the control circuit comprises: a conduction time generation circuit; a conduction time control circuit; a comparison circuit; and a logic circuit. Since the reference signal is a constant signal generated by the system representing the desired output voltage, the switching converter output is stable and easy to soft start.
Description
Technical field
Embodiment of the present utility model relates to electronic circuit, relates in particular to switch converters and the control circuit thereof of constant on-time control.
Background technology
Constant on-time control (COT control, constant on-time control) has obtained good application because its superior load transient response, simple internal structure and level and smooth mode of operation are switched in field of power supplies.In traditional constant on-time control, the ON time ton of switch converters is determined by following formula:
Wherein Vout is the output voltage of switch converters, and Vin is the input voltage of switch converters, and Ts is the configuration switch cycle of switch converters.
Yet, in adopting numerically controlled COT switch converters, if directly adopt above formula to calculate ON time ton, can produce two problems.At first, because output voltage V out is changing always, its digital sample values Vout_sample in different time points can be variant.Figure 1A and 1B are the oscillogram of the numerical control switch converter of employing traditional C OT control.Shown in Figure 1A, in t1 and the t2 moment, the digital sample values Vout_sample of output voltage V out is different, causes the ON time ton that calculates also different, and this will increase the shake of output voltage V out undoubtedly.In addition, if digital sample values Vout_sample has noise as shown in Figure 2, the ON time ton that then calculates will constantly change, and cause output voltage V out unstable.
Secondly, directly adopt formula (1) to calculate ON time ton and will cause switch converters in some cases, for example heavy duty, large output capacitance or initial duty cycle and soft-start time can't successfully be realized soft start more in short-term.Fig. 2 is for adopting the oscillogram of numerical control switch converter when soft start of traditional C OT control.As shown in Figure 2, in soft start state, the reference signal VREF that represents desired output voltage is increased gradually by zero beginning.The initial value Vout_ini of output voltage V out can be drawn by following formula:
Wherein ton_min is minimum ON time, and toff_min is the minimum turn-off time.The initial value ton_ini of ON time ton can calculate according to following formula:
If the ton_ini that calculates is less than the minimum ON time ton_min that allows, the soft start of switch converters will be counted out.
The utility model content
The technical problems to be solved in the utility model provides working stability and is easy to switch converters and the control circuit thereof of the constant on-time control of soft start.
A kind of control circuit for switch converters according to the utility model embodiment, this switch converters comprises the switching circuit with at least one switching tube, this switching circuit is converted to output voltage with shutoff with input voltage by the conducting of at least one switching tube, it is characterized in that, this control circuit comprises: ON time produces circuit, has first input end, the second input and output, wherein first input end receives input voltage, the second input receives reference voltage, ON time produces circuit based on input voltage and reference signal, produces the ON time signal at output; The ON time control circuit has first input end, the second input and output, and wherein the second input is coupled to output that ON time produces circuit to receive the ON time signal, and output provides the ON time control signal; Comparison circuit, have first input end, the second input and output, wherein first input end receives reference signal, and the second input is coupled to the output of switching circuit to receive output voltage, comparison circuit produces comparison signal based on reference signal and output voltage at output; And logical circuit, have first input end, the second input and output, wherein first input end is coupled to the output of ON time control circuit to receive the ON time control signal, the second input is coupled to the output of comparison circuit to receive comparison signal, logical circuit is based on ON time control signal and comparison signal, produce control signal at output, with conducting and the shutoff of at least one switching tube in the control switch circuit; Wherein the output of logical circuit also be coupled to the ON time control circuit first input end so that control signal to be provided, the ON time control circuit produces the ON time control signal based on ON time signal and control signal at output.
In one embodiment, ON time produces circuit and comprises: the first mlultiplying circuit, have first input end, the second input and output, and wherein first input end receives reference signal, and the second input receives scaling signal, and output provides the first product signal; Analog to digital conversion circuit has input and output, and input receives the input voltage sampled signal that represents input voltage, and output provides digital input sample signal; The second mlultiplying circuit has first input end, the second input and output, and wherein the first input end output that is coupled to analog to digital conversion circuit to be receiving digital input sample signal, the second input receiving frequency signals, and output provides the second product signal; And division circuit, have first input end, the second input and output, wherein first input end is coupled to the output of the first mlultiplying circuit to receive the first product signal, the second input is coupled to the output of the second mlultiplying circuit to receive the second product signal, and output provides the ON time signal.
In one embodiment, scaling signal equals the merchant of input voltage sampled signal and input voltage.
In one embodiment, this control circuit also comprises: slope compensation circuit produces slope compensation signal; Wherein slope compensation signal is applied to output voltage or represents the feedback signal of output voltage, also or from reference signal is deducted.
In one embodiment, this control circuit also comprises: the proportional integral circuit, have first input end, the second input and output, wherein first input end receives reference signal, the second input is coupled to the output of switching circuit to receive output voltage, the proportional integral circuit produces the proportional integral signal based on reference signal and output voltage at its output; Adder, have first input end, the second input and output, wherein first input end receives reference signal, and the second input is coupled to the output of proportional integral circuit to receive the proportional integral signal, and output is coupled to comparison circuit so that reference signal and proportional integral signal sum to be provided.
In one embodiment, this control circuit is digital control IC.
A kind of switch converters according to the utility model embodiment is characterized in that, comprising: switching circuit, comprise at least one switching tube, and the conducting by this at least one switching tube is converted to output voltage with input voltage with turn-offing; And foregoing control circuit.
In one embodiment, this switch converters also comprises: the input voltage sample circuit, have input and output, wherein input receives input voltage, and output provides the input voltage sampled signal that represents input voltage to produce the first input end of circuit to ON time.
In one embodiment, this switch converters also comprises: feedback circuit, have input and output, and wherein input receives output voltage, and output provides the feedback signal that represents output voltage the second input to comparison circuit.
In one embodiment, described switching circuit comprises: the first switching tube, have first end, the second end and control end, and wherein first end receives input voltage, and control end is coupled to logical circuit with reception control signal; The second switch pipe has first end, the second end and control end, and wherein first end is coupled to the second end of the first switching tube, the second end ground connection, and control end is coupled to logical circuit with reception control signal; Inductor has first end and the second end, and wherein first end is coupled to the second end of the first switching tube and the first end of second switch pipe; And output capacitor, be coupled between second end and ground of inductor.
Switch converters according to the utility model embodiment, according to reference signal but not output voltage calculates ON time, the impact of having avoided output voltage ripple and modulus sampling are introduced in the prior art noise that ON time is caused is so that the switch converters stable output.In addition, in the less situation of heavy duty, large output capacitance or initial duty cycle and soft-start time, compared with prior art be easier to soft opening according to the switch converters of the utility model embodiment.
Description of drawings
Figure 1A and 1B are the oscillogram of the numerical control switch converter of employing traditional C OT control;
Fig. 2 is for adopting the oscillogram of numerical control switch converter when soft start of traditional C OT control;
Fig. 3 is the block diagram according to the switch converters 300 of the utility model one embodiment;
Fig. 4 is according to the switch converters shown in Figure 3 300 of the utility model one embodiment oscillogram when the soft start;
Fig. 5 is the circuit theory diagrams that produce circuit 301 according to Fig. 3 ON time of the utility model one embodiment;
Fig. 6 is the circuit theory diagrams according to the switch converters 600 of the utility model one embodiment.
Embodiment
The below will describe specific embodiment of the utility model in detail, should be noted that the embodiments described herein only is used for illustrating, and be not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.Yet, it is evident that for those of ordinary skills: needn't adopt these specific detail to carry out the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised among at least one embodiment of the utility model.Therefore, phrase " in one embodiment ", " in an embodiment ", " example " or " example " that occurs in each place of whole specification differs to establish a capital and refers to same embodiment or example.In addition, can with any suitable combination and or sub-portfolio with specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that at this accompanying drawing that provides all be for illustrative purposes, and accompanying drawing is drawn in proportion not necessarily.Should be appreciated that when claiming " element " " to be connected to " or " coupling " during to another element it can be directly to connect or be couple to another element or can have intermediary element.On the contrary, when claiming element " to be directly connected to " or during " being directly coupled to " another element, not having intermediary element.The identical identical element of Reference numeral indication.Term used herein " and/or " comprise any and all combinations of one or more relevant projects of listing.
In embodiment of the present utility model, adopt reference signal VREF to substitute output voltage V out and calculate ON time ton, shown in following formula:
Under stable state, output voltage V out equates substantially with reference signal VREF.Adopt formula (4) to calculate ON time ton, the switching frequency of switch converters is equated substantially, wherein Fs=1/Ts with setpoint frequency Fs.
Because reference signal VREF is the constant signal of the representative desired output voltage that produced by system, thereby the impact of having avoided output voltage ripple and modulus sampling are introduced in the prior art noise that ON time is caused, so that the switch converters stable output.In addition, because ON time ton increases with reference signal VREF, in the less situation of heavy duty, large output capacitance or initial duty cycle and soft-start time, compared with prior art be easier to soft opening according to the switch converters of the utility model embodiment.
Fig. 3 is the block diagram according to the switch converters 300 of the utility model one embodiment.Switch converters 300 comprises control circuit (shown in dotted line frame among the figure) and switching circuit 305.Switching circuit 305 comprises at least one switching tube, and the conducting by this at least one switching tube is converted to output voltage V out with input voltage vin with turn-offing.Switching circuit 305 can adopt any DC-DC or ac/dc transformation topology structure, for example synchronous or asynchronously boost, buck converter, and normal shock, anti exciting converter etc.Switching tube in the switching circuit 305 can be any controllable semiconductor switch device, such as mos field effect transistor (MOSFET), igbt (IGBT) etc.
Control circuit comprises that ON time produces circuit 301, ON time control circuit 302, comparison circuit 303 and logical circuit 304.ON time produces circuit 301 and has first input end, the second input and output, wherein first input end receives input voltage vin, the second input receives reference voltage VREF, ON time produces circuit 301 based on input voltage vin and reference signal VREF, produces ON time signal ton at output.Relation between ON time signal ton and input voltage vin and the reference signal VREF as shown in Equation (4).
ON time control circuit 302 has first input end, the second input and output, and wherein the second input is coupled to output that ON time produces circuit 301 to receive ON time signal ton, and output provides ON time control signal COT.Comparison circuit 303 has first input end, the second input and output, wherein first input end receives reference signal VREF, the second input is coupled to the output of switching circuit 305 to receive output voltage V out, comparison circuit 303 produces comparison signal SET based on reference signal VREF and output voltage V out at output.
In one embodiment, switch converters 300 also comprises feedback circuit.This feedback circuit has input and output, and wherein the input output that is coupled to switching circuit 305 to be receiving output voltage V out, and output provides the feedback signal that represents output voltage V out the second input to comparison circuit 303.In one embodiment, input voltage sample circuit 307 and above-mentioned feedback circuit include resitstance voltage divider.
In one embodiment, in order to prevent producing subharmonic oscillation at output voltage V out, control circuit also comprises slope compensation circuit 306.Slope compensation circuit 306 produces slope compensation signal Vslope, and it is provided to comparison circuit 303.Slope compensation signal Vslope can be applied to output voltage V out or represent the feedback signal of output voltage V out, also can be deducted from reference signal VREF.
In one embodiment, control circuit shown in Figure 3 is digital control IC, and ON time counting circuit 301 wherein, ON time control circuit 302, logical circuit 304 and slope compensation circuit 306 all can be realized by digital control.
Fig. 4 is according to the switch converters shown in Figure 3 300 of the utility model one embodiment oscillogram when the soft start, and wherein dotted portion is the oscillogram of the switch converters that adopts traditional C OT control.In soft start state, reference signal VREF is increased gradually by zero beginning.In traditional C OT control, such as the description of background technology part, the ton_ini that gets according to formula (2) and (3) calculating is less than minimum ON time ton_min, so that actual ON time equals ton_min always, output voltage V out can't increase, and causes the soft start failure.In the embodiment shown in fig. 3, calculate ON time ton according to formula (4), thereby ON time ton is along with reference signal VREF increases gradually, solved in the prior art soft open can not problem.
Fig. 5 is the circuit theory diagrams that produce circuit 301 according to Fig. 3 ON time of the utility model one embodiment.ON time produces circuit 301 and comprises the first mlultiplying circuit 508, analog to digital conversion circuit 509, the second mlultiplying circuit 510 and division circuit 511.The first mlultiplying circuit 508 has first input end, the second input and output, and wherein first input end receives reference signal VREF, and the second input receives scaling signal K, and output provides the first product signal MUL1.Analog to digital conversion circuit 509 has input and output, and wherein input is coupled to input voltage sample circuit 307 to receive input voltage sampled signal Vinsen, and output provides digital input sample signal Vin_sample.The second mlultiplying circuit 510 has first input end, the second input and output, wherein first input end is coupled to the output of analog to digital conversion circuit 509 to receive digital input sample signal Vin_sample, the second input receiving frequency signals Fs, output provides the second product signal MUL2.Division circuit 511 has first input end, the second input and output, wherein first input end is coupled to the output of the first mlultiplying circuit 508 to receive the first product signal MUL1, the second input is coupled to the output of the second mlultiplying circuit 510 to receive the second product signal MUL2, and output provides ON time signal ton.
Scaling signal K is the value relevant with the sampling ratio (for example electric resistance partial pressure ratio) of input voltage sample circuit and/or feedback circuit.In one embodiment, scaling signal K equals the sampling ratio of input voltage sample circuit 307, namely equals the merchant of input voltage sampled signal Vinsen and input voltage vin.
Fig. 6 is the circuit theory diagrams according to the switch converters 600 of the utility model one embodiment.Switch converters 600 comprises control circuit (shown in dotted line frame among the figure), drive circuit 612 and switching circuit 605.Switching circuit 605 is buck converter, comprises switching tube S1, S2, inductor L and output capacitor COUT, and it connects as shown in the figure.
Control circuit comprises that ON time produces circuit 601, ON time control circuit 602, comparison circuit 603, logical circuit 604 and slope compensation circuit 606.ON time produces circuit 601 can adopt structure shown in Figure 5 or other suitable structures.Comparison circuit 603 comprises comparator C OM1.Comparator C OM1 has in-phase input end, inverting input and output, wherein in-phase input end receives the poor of reference signal VREF and slope compensation signal Vslope, inverting input is coupled to the output of switching circuit 605 to receive output voltage V out, and output provides comparison signal SET.Logical circuit 604 comprises rest-set flip-flop FF1.The set end S of rest-set flip-flop FF1 is coupled to ON time control circuit 602 to receive ON time control signal COT, and reset terminal R is coupled to the output of comparator C OM1 to receive comparison signal SET, and output Q provides control signal CTRL.
Drive circuit 612 is coupled to the output of rest-set flip-flop FF1 with reception control signal CTRL, and produces the driving signal to the control end of switching tube S1, S2, with driving switch pipe S1 and S2.
In some application scenario, the equivalent series resistance of output capacitor COUT may be introduced certain dc error between output voltage V out and reference signal VREF.In order to address this problem, control circuit also comprises the error compensation link usually.In one embodiment, as shown in Figure 6, the error compensation link comprises proportional integral circuit 613 and adder.Proportional integral circuit 613 has first input end, the second input and output, and wherein first input end receives reference signal VREF, and the second input is coupled to the output of switching circuit 605 to receive output voltage V out.Proportional integral circuit 613 produces proportional integral signal Vpi based on reference signal VREF and output voltage VO UT at its output.Adder has first input end, the second input and output, wherein first input end receives reference signal VREF, the second input is coupled to the output of proportional integral circuit 613 to receive proportional integral signal Vpi, and output is coupled to comparison circuit 603 so that reference signal VREFX to be provided.In one embodiment, proportional integral circuit 613 comprises operational amplifier.In one embodiment, between the second input of the output of switching circuit 605 and proportional integral circuit 613, also couple an analog to digital conversion circuit, between the in-phase input end of the output of adder and comparator C OM1, also couple a D/A converting circuit.
In certain embodiments, the error compensation link also can only comprise adder, with reference to signal VREF and default offset signal VOFFSET addition, and providing to comparison circuit 603 as reference signal VREFX with value both.
In one embodiment, for fear of noise jamming etc. circuit 603 is relatively impacted, cause switching tube S1 just to be turned off, be switched on again at once, control circuit also comprises the minimum turn-off time circuit.This minimum turn-off time circuit shields the comparison signal SET of comparison circuit 603 outputs in minimum turn-off time toff_min.
Although described the utility model with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.Because the utility model is implementation and do not break away from spirit or the essence of utility model in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and should be in the spirit and scope that the claim of enclosing limits explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (10)
1. control circuit that is used for switch converters, this switch converters comprises the switching circuit with at least one switching tube, this switching circuit is converted to output voltage with shutoff with input voltage by the conducting of at least one switching tube, it is characterized in that this control circuit comprises:
ON time produces circuit, have first input end, the second input and output, wherein first input end receives input voltage, and the second input receives reference voltage, ON time produces circuit based on input voltage and reference signal, produces the ON time signal at output;
The ON time control circuit has first input end, the second input and output, and wherein the second input is coupled to output that ON time produces circuit to receive the ON time signal, and output provides the ON time control signal;
Comparison circuit, have first input end, the second input and output, wherein first input end receives reference signal, and the second input is coupled to the output of switching circuit to receive output voltage, comparison circuit produces comparison signal based on reference signal and output voltage at output; And
Logical circuit, have first input end, the second input and output, wherein first input end is coupled to the output of ON time control circuit to receive the ON time control signal, the second input is coupled to the output of comparison circuit to receive comparison signal, logical circuit is based on ON time control signal and comparison signal, produce control signal at output, with conducting and the shutoff of at least one switching tube in the control switch circuit;
Wherein the output of logical circuit also be coupled to the ON time control circuit first input end so that control signal to be provided, the ON time control circuit produces the ON time control signal based on ON time signal and control signal at output.
2. control circuit as claimed in claim 1 is characterized in that, ON time produces circuit and comprises:
The first mlultiplying circuit has first input end, the second input and output, and wherein first input end receives reference signal, and the second input receives scaling signal, and output provides the first product signal;
Analog to digital conversion circuit has input and output, and input receives the input voltage sampled signal that represents input voltage, and output provides digital input sample signal;
The second mlultiplying circuit has first input end, the second input and output, and wherein the first input end output that is coupled to analog to digital conversion circuit to be receiving digital input sample signal, the second input receiving frequency signals, and output provides the second product signal; And
Division circuit, have first input end, the second input and output, wherein first input end is coupled to the output of the first mlultiplying circuit to receive the first product signal, the second input is coupled to the output of the second mlultiplying circuit to receive the second product signal, and output provides the ON time signal.
3. control circuit as claimed in claim 2 is characterized in that, scaling signal equals the merchant of input voltage sampled signal and input voltage.
4. control circuit as claimed in claim 1 is characterized in that, also comprises:
Slope compensation circuit produces slope compensation signal;
Wherein slope compensation signal is applied to output voltage or represents the feedback signal of output voltage, also or from reference signal is deducted.
5. control circuit as claimed in claim 1 is characterized in that, also comprises:
The proportional integral circuit, have first input end, the second input and output, wherein first input end receives reference signal, the second input is coupled to the output of switching circuit to receive output voltage, the proportional integral circuit produces the proportional integral signal based on reference signal and output voltage at its output;
Adder, have first input end, the second input and output, wherein first input end receives reference signal, and the second input is coupled to the output of proportional integral circuit to receive the proportional integral signal, and output is coupled to comparison circuit so that reference signal and proportional integral signal sum to be provided.
6. control circuit as claimed in claim 1 is characterized in that, this control circuit is digital control IC.
7. a switch converters is characterized in that, comprising:
Switching circuit comprises at least one switching tube, and the conducting by this at least one switching tube is converted to output voltage with input voltage with turn-offing; And
Such as each described control circuit in the claim 1 to 6.
8. switch converters as claimed in claim 7 is characterized in that, also comprises:
The input voltage sample circuit has input and output, and wherein input receives input voltage, and output provides the input voltage sampled signal that represents input voltage to produce the first input end of circuit to ON time.
9. switch converters as claimed in claim 7 is characterized in that, also comprises:
Feedback circuit has input and output, and wherein input receives output voltage, and output provides the feedback signal that represents output voltage the second input to comparison circuit.
10. switch converters as claimed in claim 7 is characterized in that, described switching circuit comprises:
The first switching tube has first end, the second end and control end, and wherein first end receives input voltage, and control end is coupled to the output of logical circuit with reception control signal;
The second switch pipe has first end, the second end and control end, and wherein first end is coupled to the second end of the first switching tube, the second end ground connection, and control end is coupled to the output of logical circuit with reception control signal;
Inductor has first end and the second end, and wherein first end is coupled to the second end of the first switching tube and the first end of second switch pipe; And
Output capacitor is coupled between second end and ground of inductor.
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| CN 201220370701 CN202713140U (en) | 2012-06-07 | 2012-07-30 | Switch converter controlled by constant conduction time and control circuit thereof |
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| CN201210185829.4 | 2012-06-07 | ||
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104144544A (en) * | 2014-04-21 | 2014-11-12 | 美芯晟科技（北京）有限公司 | Dimmable LED drive circuit |
| CN110336457A (en) * | 2019-07-26 | 2019-10-15 | 南京桐润新能源有限公司 | A kind of digital vehicle power supply output soft-starting method |
| CN111224645A (en) * | 2018-11-26 | 2020-06-02 | 力智电子股份有限公司 | DC-DC conversion circuit and time signal generator thereof |
| EP4044415A1 (en) * | 2021-02-15 | 2022-08-17 | STMicroelectronics (Rousset) SAS | Startup of a switching-mode power supply |
-
2012
- 2012-07-30 CN CN 201220370701 patent/CN202713140U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104144544A (en) * | 2014-04-21 | 2014-11-12 | 美芯晟科技（北京）有限公司 | Dimmable LED drive circuit |
| CN104144544B (en) * | 2014-04-21 | 2017-01-11 | 美芯晟科技（北京）有限公司 | Dimmable LED drive circuit |
| CN111224645A (en) * | 2018-11-26 | 2020-06-02 | 力智电子股份有限公司 | DC-DC conversion circuit and time signal generator thereof |
| CN111224645B (en) * | 2018-11-26 | 2023-10-20 | 力智电子股份有限公司 | DC-DC conversion circuit and time signal generator thereof |
| CN110336457A (en) * | 2019-07-26 | 2019-10-15 | 南京桐润新能源有限公司 | A kind of digital vehicle power supply output soft-starting method |
| EP4044415A1 (en) * | 2021-02-15 | 2022-08-17 | STMicroelectronics (Rousset) SAS | Startup of a switching-mode power supply |
| FR3119950A1 (en) * | 2021-02-15 | 2022-08-19 | Stmicroelectronics (Rousset) Sas | Starting a switching power supply |
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