CN102510220A - Average output current control device for power current transducer in continuous current mode - Google Patents
Average output current control device for power current transducer in continuous current mode Download PDFInfo
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Abstract
The invention discloses an average output current control device for a power current transducer in the continuous current mode. The average output current control device comprises a reference source module (1), a reference source operation functional module (2), a state detection module (3), an error detection and zero return module (4), a controllable constant turn-off time module (5) and a power driver module (6), wherein a controllable constant turn-off time is set in the controllable constant turn-off time module (5); the reference source module (1), the reference source operation functional module (2) and an error detection and zero return module (4) are sequentially connected through signals; the output of the error detection and zero return module (4) is connected with the input of the power driver module (6) and the input of the controllable constant turn-off time module (5) respectively; and the output of the power driver module (6) is used for controlling the power current transducer. By adopting the average output current control device, the average output current of the power current transducer is independent of the input/output voltage of the power current transducer, as well as the accuracy of a circuit device.
Description
Technical field
The invention belongs to the application electric technology field, relate to power power pack topological structure and control.More particularly, the present invention relates to a kind of average output current method that is used to control buck and boost power power pack.Described power power pack can be used as the controllable current source and in various application scenarios, uses, and uses like light-emitting diode driven application and battery charge.
Background technology
Buck and boost power power pack can be widely used in the input and output combination of various requirement.When the inductive current of power power pack operates on continuous mode, its conducting current stress is lower.It is to be suitable for using than higher power control that the inductive current of power power pack operates on continuous mode.As far as buck and boost power power pack, the inductive current of its output current and buck and boost power power pack is a non-linear relation.Usually will control the output current of buck and boost power power pack, this depends on the input and output voltage of buck and boost power power pack, the precision of circuit devcie.Detect the input and output voltage and the precision that requires circuit devcie of buck and boost power power pack, this can increase the complexity that whole system realizes, increases the cost that whole system realizes.Foregoing is as shown in Figure 1.
Summary of the invention
The technical problem that the present invention will solve provides a kind of average output current control device that is used for buck and boost power power pack continuous current pattern, and it makes the average output current of power power pack can be independent of the precision of the input/output voltage and the circuit devcie of power power pack.
In order to solve the problems of the technologies described above; The present invention provides a kind of average output current control device of power power pack continuous current pattern, comprises reference source module, reference source calculation function module, state detection module, error-detecting and the module that makes zero, controlled constant turn-off time module and analog line driver module; In controlled constant turn-off time module, be provided with the controlled constant turn-off time;
Reference source module, reference source calculation function module and error-detecting and make zero module successively signal link to each other; The output of the error-detecting and the module that makes zero links to each other with the input of analog line driver module and the input of controlled constant turn-off time module respectively; The output of analog line driver module links to each other with the input of reference source calculation function module, and the output of controlled constant turn-off time module links to each other with the input of reference source calculation function module and the input of analog line driver module respectively; The output of state detection module links to each other with the input of the error-detecting and the module that makes zero; The output of analog line driver module is used for the power controlling power pack;
The reference source module is used to produce predetermined control signal;
Reference source calculation function module is used for carrying out computing according to different power power pack topological structure according to pre-defined algorithm and produces corresponding reference control signal;
State detection module is used for the state variable of detection power power pack and it is transformed into the signal with reference source calculation function module output signal same form;
The error-detecting and the module that makes zero are used to detect the mean difference from reference source calculation function module status detection module output signal, and output signal controlling analog line driver module makes that the power switch in the power power pack turn-offs when the mean difference zero passage;
Controlled constant turn-off time module is used for controlled constant turn-off time output signal controlling analog line driver module when finishing, and makes the power switch conducting;
The analog line driver module is used for the power switch in the driving power power pack, and is controlled by error-detecting and the output signal of make zero module and controlled constant turn-off time module;
According to pre-defined algorithm, the output signal of the output signal of analog line driver module and controlled constant turn-off time module is used for the computing of reference synchronization source calculation function module.
As the improvement that is used for the average output current control device of buck and boost power power pack continuous current pattern of the present invention: state detection module comprises resistance R s.
As the further improvement that is used for the average output current control device of buck and boost power power pack continuous current pattern of the present invention: the error-detecting and the module that makes zero are made up of adder, integrator and comparator; Adder, integrator and comparator signal successively link to each other;
The input anode of adder links to each other with the output of reference source calculation function module; The input negative terminal of adder links to each other with the output of state detection module; The output of comparator with link to each other with the input of analog line driver module and the input of controlled constant turn-off time module respectively.
The above reference source module is simple also complicated to being made up of various operating functions to being made up of a basic operation.Reference source calculation function module is to carry out computing according to pre-defined algorithm so that this output signal is the reference control signal of corresponding power power pack according to different capacity power pack topological structure; It is simple to for forms by a basic operation or complicacy to forming by various operating functions.According to pre-defined algorithm (this pre-defined algorithm is a known technology) embodiment, the input and output voltage of power power pack does not participate in pre-defined algorithm to carry out computing and produces corresponding reference control signal in reference source calculation function module.The error-detecting and the module that makes zero be simple to forms by a basic operation and or complicacy to forming by various operating functions.State detection module be simple to by one detect that resistance is formed or complicacy to forming by various operating functions.Controlled constant turn-off time module be simple to for forms by a basic operation or complicacy to forming by various operating functions.The analog line driver module be simple to forms by a basic operation or complicacy to forming by various operating functions.
According to the buck and the different capacity power pack topological structure that boosts; The output signal of reference source module carries out computing according to pre-defined algorithm in reference source calculation function module, so that the output signal of reference source calculation function module is the reference control signal of corresponding power power pack.For relatively reference control signal and state variable in power switch conduction period, the output V of state detection module
ILOutput reference control signal V with reference source calculation function module
REFIn the error-detecting and the module that makes zero, detect.When the mean difference zero passage, the output of the error-detecting and the module that makes zero starts controlled constant turn-off time module and the power controlling Drive Module makes this power switch end.When the controlled constant turn-off time finished, the output power controlling Drive Module of controlled constant turn-off time module made this power switch conducting and goes round and begins again.
In controlling schemes of the present invention, the average current of inductive current is followed the reference control signal V with the corresponding power power pack of predetermined control signal
REFAnd make power power pack average output current follow corresponding predetermined control signal.This scheme realizes fairly simple, the input and output testing circuit that need not add.Controlling schemes of the present invention can make the precision of buck and boost power power pack average output current be independent of the input and output voltage of power power pack, the precision of circuit devcie.The input and output voltage of power power pack, the precision of circuit devcie only changes the switching frequency of buck and boost power power pack.
The present invention has following advantage with respect to prior art:
In the present invention; Use the benefit of the high accuracy average output current control technology of power power pack continuous current pattern to be: the average output current so that the simplest least cost is accomplished the power power pack is accurately controlled, and makes the conduction loss of power power pack and switching loss lower.Whole system is high accuracy and high efficiency system.
Description of drawings
Do further explain below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 1 is the existing block diagram that is used to control the average output current of buck (anti-swash) power power pack.
Fig. 2 is that controlling schemes of the present invention is used for buck and the basic average output current control scheme block diagram of boost power power pack.
Fig. 3 is the average output current control scheme figure that controlling schemes of the present invention is used for buck (anti-sharp) power power pack:
A is the instantiation circuit block diagram;
B is the instantiation circuit block diagram of error-detecting and the module 4 that makes zero among a.
Fig. 4 is error-detecting and module 4 output waveform figures that make zero (CH1=inductive current, the output of CH2=integrator, CH3=output pulse width modulating pulse control signal) among Fig. 3 b.
Fig. 5 is the average output current control scheme instantiation circuit block diagram that controlling schemes of the present invention is used for the boost power power pack.
Embodiment
The several function module is arranged, the predetermined control signal V that provides by reference source module 1 in block diagram
REF, reference source calculation function module 2, state detection module 3 (being specially resistance R s), error-detecting and the module 4 that makes zero, the analog line driver 6 of controlled constant turn-off time module 5 and power switch is formed.In controlled constant turn-off time module 5, be provided with the controlled constant turn-off time.
The predetermined control signal V that reference source module 1 provides
REF, reference source calculation function module 2 and error-detecting and make zero module 4 successively signal link to each other; The output of the error-detecting and the module 4 that makes zero links to each other with the input of analog line driver module 6 and the input of controlled constant turn-off time module 5 respectively; The output of analog line driver module 6 links to each other with the input of reference source calculation function module 2, and the output of controlled constant turn-off time module 5 links to each other with the input of reference source calculation function module 2 and the input of analog line driver module 6 respectively; The output of state detection module 3 links to each other with the input of the error-detecting and the module 4 that makes zero; The output of analog line driver module 6 is used for the power controlling power pack.
The physical circuit block diagram of the error-detecting and the module 4 that makes zero is shown in Fig. 3 b.The error-detecting and the module 4 that makes zero can be made up of adder 41, integrator 42 and comparator 43.The input anode of adder 41 links to each other with the output of reference source calculation function module 2; The input negative terminal of adder 41 links to each other with the output of state detection module 3; The output of comparator 43 with link to each other with the input of analog line driver module 6 and the input of controlled constant turn-off time module 5 respectively.
When power switch Q1 conducting, the inductive current of transformer T increases; This inductive current is through resistance R s output relevant detection voltage.Predetermined control signal V
REFCarry out computing through reference source calculation function module 2 according to the power power pack pre-defined algorithm of buck and produce corresponding reference control signal voltage.Above-mentioned detection voltage and above-mentioned reference control signal voltage are through error-detecting and make zero module 4 relatively.Specific as follows: as to detect voltage and reference control signal voltage and in adder 41, subtract each other.The output of adder 41 is inputs of integrator 42.Along with the inductive current increase of transformer T, the output of integrator 42 is negative and zero by negative change by zero change.The output of the error-detecting and the module 4 that makes zero is as shown in Figure 4.Zero when the output of integrator 42 by negative change, mean that promptly the inductive current of transformer T finishes moment in power switch Q1 conducting, its instantaneous average current equals reference control signal voltage corresponding reference electric current.Comparator 43 actions trigger controlled constant turn-off time module 5 and power controlling driver 6 simultaneously, and make power switch Q1 turn-off.
When the controlled constant turn-off time of establishing in the controlled constant turn-off time module 5 finished, the output power controlling driver 6 of controlled constant turn-off time module 5 made and power switch Q1 conducting repeats above-mentioned switching process thereby go round and begin again.
The reference source calculation function module 2 of buck shown in Fig. 3 a (anti-sharp) power power pack is according to buck (anti-sharp) power power pack topological structure; The input and output voltage of buck (anti-sharp) power power pack does not participate in pre-defined algorithm and carries out computing, so that the output of reference source calculation function module 2 is reference control signals of corresponding buck (anti-sharp) power power pack.The average inductor current of buck (anti-sharp) power power pack is followed the reference source calculation function module 2 corresponding reference control signals of output and is made the average output current of anti-excited power power pack follow predetermined control signal V
REF, and the average output current of power power pack is independent of the input/output voltage of anti-excited power power pack, and the precision of circuit devcie to make buck (anti-sharp).
The several function module is arranged, the predetermined control signal V that provides by reference source module 1 in block diagram
REF, reference source calculation function module 2, state detection module 3 (being specially resistance R s), error-detecting and the module 4 that makes zero, the analog line driver 6 of controlled constant turn-off time module 5 and power switch is formed.
Predetermined control signal V
REFCarry out computing through reference source calculation function module 2 according to the power power pack pre-defined algorithm that boosts and produce corresponding reference control signal voltage.Except this point, all the other its operation principles and embodiment 1 are said (to be that Fig. 3 operation principle a) is identical.
At last, it is also to be noted that what more than enumerate only is several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (3)
1. the average output current control device of power power pack continuous current pattern is characterized in that: comprise reference source module (1), reference source calculation function module (2), state detection module (3), error-detecting and the module that makes zero (4), controlled constant turn-off time module (5) and analog line driver module (6); In controlled constant turn-off time module (5), be provided with the controlled constant turn-off time;
Said reference source module (1), reference source calculation function module (2) and error-detecting and the module that makes zero (4) signal successively link to each other; The output of error-detecting and the module that makes zero (4) links to each other with the input of analog line driver module (6) and the input of controlled constant turn-off time module (5) respectively; The output of said analog line driver module (6) links to each other with the input of reference source calculation function module (2), and the output of said controlled constant turn-off time module (5) links to each other with the input of reference source calculation function module (2) and the input of analog line driver module (6) respectively; The output of state detection module (3) links to each other with the input of error-detecting and the module that makes zero (4); The output of said analog line driver module (6) is used for the power controlling power pack;
Said reference source module (1) is used to produce predetermined control signal;
Said reference source calculation function module (2) is used for carrying out computing according to different power power pack topological structure according to pre-defined algorithm and produces corresponding reference control signal;
Said state detection module (3) is used for the state variable of detection power power pack and it is transformed into the signal of exporting the signal same form with reference source calculation function module (2);
Said error-detecting and the module that makes zero (4) are used for detecting the mean difference from reference source calculation function module (2) and state detection module (3) output signal; Output signal controlling analog line driver module (6) when the mean difference zero passage makes that the power switch in the power power pack turn-offs;
Said controlled constant turn-off time module (5) is used for controlled constant turn-off time output signal controlling analog line driver module (6) when finishing, and makes the power switch conducting;
Said analog line driver module (6) is used for the power switch in the driving power power pack, and is controlled by error-detecting and the output signal of module that makes zero (4) and controlled constant turn-off time module (5);
According to pre-defined algorithm, the output signal of the output signal of analog line driver module (6) and controlled constant turn-off time module (5) is used for the computing of reference synchronization source calculation function module (2).
2. the average output current control device that is used for buck and boost power power pack continuous current pattern according to claim 1, it is characterized in that: said state detection module (3) comprises resistance R s.
3. the average output current control device that is used for buck and boost power power pack continuous current pattern according to claim 1 and 2 is characterized in that:
Said error-detecting and the module that makes zero (4) are made up of adder (41), integrator (42) and comparator (43); Said adder (41), integrator (42) and comparator (43) signal successively link to each other;
The input anode of said adder (41) links to each other with the output of reference source calculation function module (2); The input negative terminal of said adder (41) links to each other with the output of state detection module (3); The output of comparator (43) with link to each other with the input of analog line driver module (6) and the input of controlled constant turn-off time module (5) respectively.
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| CN201110365118.0A CN102510220B (en) | 2011-11-17 | 2011-11-17 | Average output current control device for power current transducer in continuous current mode |
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| CN201110365118.0A CN102510220B (en) | 2011-11-17 | 2011-11-17 | Average output current control device for power current transducer in continuous current mode |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001202146A (en) * | 2000-01-19 | 2001-07-27 | Meiji Natl Ind Co Ltd | Regulated power control device |
| CN101237190A (en) * | 2008-01-25 | 2008-08-06 | 魏其萃 | High-precision average output current control scheme for critical interrupted and continuous current mode of power current converter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001202146A (en) * | 2000-01-19 | 2001-07-27 | Meiji Natl Ind Co Ltd | Regulated power control device |
| CN101237190A (en) * | 2008-01-25 | 2008-08-06 | 魏其萃 | High-precision average output current control scheme for critical interrupted and continuous current mode of power current converter |
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