CN114928244B - Line loss compensation correction method and circuit based on output current - Google Patents
Line loss compensation correction method and circuit based on output current Download PDFInfo
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- CN114928244B CN114928244B CN202210750990.5A CN202210750990A CN114928244B CN 114928244 B CN114928244 B CN 114928244B CN 202210750990 A CN202210750990 A CN 202210750990A CN 114928244 B CN114928244 B CN 114928244B
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
A line loss compensation correction method based on output current comprises the following steps: detecting output current actually generated by a power tube driven by an original duty ratio signal based on original requirements, converting the output current into an electric signal, and performing compensation calculation according to the original duty ratio signal and the electric signal to obtain a compensation correction signal; and obtaining a corrected duty ratio signal according to the compensation correction signal and the original duty ratio signal, and applying the corrected duty ratio signal to the power tube so that the actual output power of the power tube is equal to the target output power corresponding to the original duty ratio signal in a lossless state. The invention utilizes the characteristic that the output current of the chip is in direct proportion to the line loss of the system to modulate and correct the duty ratio signal by the output current, thereby being capable of reasonably compensating the useless power consumption of the loss of the output power on the resistance of the connecting line and the interface without causing excessive or insufficient compensation.
Description
Technical Field
The invention relates to the field of circuits, in particular to a line loss compensation correction method and a line loss compensation correction circuit based on output current.
Background
In the application of heating equipment which needs to output certain power, because the wire, the interface and other structures connecting the power supply and the load are provided with resistors, the actual voltage seen by the power receiving part (heating wire) can have a voltage drop relative to the expected voltage. This voltage drop is not only affected by these resistances, but also related to the magnitude of the output current. Such a voltage drop may cause the power drawn by the powered portion (the heater) to be less than expected. To solve this problem, the corresponding system design often requires a certain "back-off" of the power supply control chip, i.e. to "properly" boost the output power to compensate for the loss due to voltage drop (line loss).
In the application of the heat-generating device, the conventional compensation method may be to estimate the power loss according to the possible resistance on the system, and then increase the duty ratio of the chip output (the heat-generating device is often output in PWM, and a larger duty ratio will output a larger power). The disadvantage of this compensation method is that it can only compensate the same loss for different load (heater resistance) with different wire losses. Compensating for the selected load results in under-compensation for heavier loads and over-compensation for lighter loads.
Disclosure of Invention
In view of the above technical problems, the present invention provides a line loss compensation correction method and circuit based on output current, so as to implement corresponding compensation for line loss under different load conditions.
According to an aspect of the present invention, there is provided a line loss compensation correction method based on an output current, applied to a control chip of a heat generating device, the method including:
detecting output current actually generated by a power tube driven by an original duty ratio signal based on original requirements, converting the output current into an electric signal, and performing compensation calculation according to the original duty ratio signal and the electric signal to obtain a compensation correction signal; and obtaining a corrected duty ratio signal according to the compensation correction signal and the original duty ratio signal, and applying the corrected duty ratio signal to the power tube so as to enable the actual output power of the power tube to be equal to the target output power corresponding to the original duty ratio signal in a lossless state.
Further, the raw duty cycle signal is generated by a control chip of the heat generating device.
Further, the performing compensation calculation according to the original duty ratio signal and the electrical signal to obtain a compensation correction signal includes: obtaining loss power caused by loss resistance according to actual output power represented by the electric signal and target output power corresponding to the original duty ratio signal; obtaining a correction power corresponding to the correction duty ratio signal according to the loss power and a target output power corresponding to the original duty ratio signal; and obtaining the compensation correction signal according to the correction power.
Further, the obtaining a corrected duty ratio signal according to the compensation correction signal and the original duty ratio signal includes: and summing the compensation correction signal and the original duty ratio signal to obtain the correction duty ratio signal.
In matching with the line loss compensation and correction method based on the output current, the present invention provides, in another aspect, a line loss compensation and correction circuit based on the output current, where the circuit includes: the detection and correction module comprises a detection unit and a correction unit, wherein the detection unit is used for detecting the output current actually generated by driving a power tube by an original duty ratio signal based on the original requirement and converting the output current into an electric signal; the correction unit is used for performing compensation calculation according to the original duty ratio signal and the electric signal to obtain a compensation correction signal; and the calculation module is used for obtaining a corrected duty ratio signal according to the compensation correction signal and the original duty ratio signal, and applying the corrected duty ratio signal to the power tube so as to enable the actual output power of the power tube to be equal to the target output power corresponding to the original duty ratio signal in a lossless state.
Further, an input end of the computing module is connected to a generation end of the original duty ratio signal of the control chip of the heat generating device and an output end of the correction unit, and an output end of the computing module is connected to an input end of a driving circuit of the power tube; the input end of the detection unit is connected with the output end of the power tube.
By adopting the scheme, the invention has the beneficial effects that:
the characteristic that the output current of the chip is in direct proportion to the line loss of the system is utilized, the output current is used for modulating and correcting the duty ratio signal, and therefore useless power consumption of the loss of the output power on the resistor of the connecting line and the interface can be reasonably compensated without causing excessive or insufficient compensation.
Drawings
FIG. 1 is a flow chart of a line loss compensation correction method based on output current according to the present invention;
fig. 2 is a block diagram of a line loss compensation correction circuit based on output current according to the present invention.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the term "connected" means that the related elements are electrically connected in an inherent characteristic and a scheme logical relationship thereof for the technical purpose of the present invention, and may be either directly connected to form an electrical connection relationship or indirectly connected through an intermediate. The specific meanings of the terms in the present specification in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, an embodiment of the present invention provides a line loss compensation correction method based on output current, which is applied to a control chip of a heat generating device, and the method includes steps S1 to S2.
In step S1, an output current actually generated by driving a power tube based on an original required original duty ratio signal is detected, the output current is converted into an electrical signal, and a compensation calculation is performed according to the original duty ratio signal and the electrical signal to obtain a compensation correction signal.
In step S2, a corrected duty ratio signal is obtained according to the compensation correction signal and the original duty ratio signal, and the corrected duty ratio signal is applied to the power tube, so that the actual output power of the power tube is equal to the target output power corresponding to the original duty ratio signal in a lossless state.
It should be noted that the original duty ratio signal and the modified duty ratio signal are essentially PWM signals, the original duty ratio signal is generated by the control chip, specifically determined by the input voltage, and the modified duty ratio signal is obtained by calculating the original duty ratio signal and the electrical signal. The power transistor may specifically be a PMOS or NMOS. Under the ideal state without loss, the power tube is driven by the original duty ratio signal to realize the heating of the electronic heating wire, the target power and the output power should be consistent, however, parasitic resistors such as PCB wiring, interface contact resistance and the like exist between the control chip and the heating wire, which are 'invalid resistors' incapable of participating in the actual heating process, the heating on the resistors is wasted, therefore, the wasted loss power is calculated and then compensated into the duty ratio signal of the driving power tube, and the output power can be equal to the target output power corresponding to the original duty ratio signal.
As compensation, the performing compensation calculation according to the original duty ratio signal and the electrical signal to obtain a compensation correction signal includes: obtaining loss power caused by loss resistance according to actual output power represented by the electric signal and target output power corresponding to the original duty ratio signal; obtaining a corrected power corresponding to the corrected duty ratio signal according to the loss power and a target output power corresponding to the original duty ratio signal; and obtaining the compensation correction signal according to the correction power.
More specifically, the obtaining a corrected duty ratio signal according to the compensation correction signal and the original duty ratio signal includes: and summing the compensation correction signal and the original duty ratio signal to obtain the correction duty ratio signal.
Wherein, the control chip internal mirror current reduces the chip output current by 1/1000 as I MIRROR ,I MIRROR I.e. the electrical signal, the power thus lost is D0 x (1000 x i) MIRROR ) 2 * Rx, D0 is the original duty cycle signal, rx is the parasitic loss resistance. Without correction compensation, the target power corresponding to the original duty cycle signal is assumed to be free of parasitic wasted power, which can be expressed as:
D0*VOUT*(1000*I MIRROR )；
VOUT is the input voltage of the control chip, and the actual power corresponding to the original duty signal is added to the input voltage. If the compensated corrected power minus the wasted loss power is equal to the target power of the original duty ratio signal, then:
the correction power may be expressed as:
D0*[VOUT*(1000*I MIRROR )+(1000*I MIRROR ) 2 *Rx]；
also, the modified power may be derived from the modified duty cycle signal. Namely:
D1*VOUT*(1000*I MIRROR )；
where D1 is the corrected duty cycle signal.
And comprehensively calculating to obtain:
D1＝D0+ΔD＝D0+(1000*I MIRROR )*Rx；
where Δ D is the compensation correction signal.
This gives:
the magnitude of the compensation correction signal is thus obtained, naturally also the correction duty cycle signal.
Based on the above line loss compensation correction method, as shown in fig. 2, the present embodiment further provides a line loss compensation correction circuit, where the correction circuit 1 includes: the detection and correction module 11, the detection and correction module 11 includes a detection unit 111 and a correction unit 112, the detection unit 111 is used for detecting an output current actually generated by driving a power tube based on an original required original duty ratio signal, and converting the output current into an electric signal; the correction unit 112 is configured to perform compensation calculation according to the original duty ratio signal and the electrical signal to obtain a compensation correction signal; a calculating module 12, wherein the calculating module 12 is configured to obtain a corrected duty cycle signal according to the compensation correction signal and the original duty cycle signal, and apply the corrected duty cycle signal to the power tube Q1, so that an actual output power of the power tube Q1 is equal to a target output power corresponding to the original duty cycle signal in a lossless state.
In an embodiment, an input end of the computing module 12 is connected to the original duty ratio signal generating end 2 of the control chip 200 of the heat generating device and an output end of the modifying unit 112, and an output end of the computing module 12 is connected to an input end of the driving circuit 3 of the power tube Q1; the input end of the detection unit 111 is connected to the output end of the power tube Q1.
In addition, the heater is denoted as P1 in fig. 2.
The specific details of each module in the circuit are described in detail in the method portion, and the details that are not disclosed may refer to the contents of the method portion, and thus are not described again.
From the above, the present disclosure utilizes the characteristic that the chip output current is in direct proportion to the line loss of the system, and modulates and corrects the duty ratio signal with the output current, so that the useless power consumption of the output power loss on the resistances of the connection line and the interface can be reasonably compensated, and the excessive or insufficient compensation can not be caused.
While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.
Claims (4)
1. A line loss compensation correction method based on output current is applied to a control chip of a heating device, and is characterized by comprising the following steps:
detecting output current actually generated by a power tube driven by an original duty ratio signal based on original requirements, converting the output current into an electric signal, and obtaining loss power caused by loss resistance according to actual output power represented by the electric signal and target output power corresponding to the original duty ratio signal;
obtaining corrected power according to the loss power and target output power corresponding to the original duty ratio signal;
obtaining a compensation correction signal according to the correction power;
and summing the compensation correction signal and the original duty ratio signal to obtain a correction duty ratio signal, and applying the correction duty ratio signal to the power tube so as to enable the actual output power of the power tube to be equal to the target output power corresponding to the original duty ratio signal in a lossless state.
2. The output-current-based line loss compensation correction method according to claim 1, wherein the original duty cycle signal is generated by a control chip of a heat-generating device.
3. An output current based line loss compensation correction circuit, the circuit comprising:
the detection and correction module comprises a detection unit and a correction unit, wherein the detection unit is used for detecting the output current actually generated by driving a power tube by an original duty ratio signal based on the original requirement and converting the output current into an electric signal; the correction unit is used for obtaining loss power caused by loss resistance according to actual output power represented by the electric signal and target output power corresponding to the original duty ratio signal; obtaining a correction power corresponding to a correction duty ratio signal according to the loss power and a target output power corresponding to the original duty ratio signal; obtaining a compensation correction signal according to the correction power;
and the calculation module is used for obtaining a corrected duty ratio signal according to the compensation correction signal and the original duty ratio signal, and applying the corrected duty ratio signal to the power tube so as to enable the actual output power of the power tube to be equal to the target output power corresponding to the original duty ratio signal in a lossless state.
4. The output-current-based line loss compensation correction circuit according to claim 3, wherein an input terminal of the calculation module is connected to a generation terminal of the original duty cycle signal of a control chip of a heat-generating device and an output terminal of the correction unit, and an output terminal of the calculation module is connected to an input terminal of a driving circuit of the power tube; the input end of the detection unit is connected with the output end of the power tube.
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| CN108574310A (en) * | 2017-03-07 | 2018-09-25 | 厦门歌乐电子企业有限公司 | A kind of USB interface charging circuit |
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| CN216390547U (en) * | 2021-09-10 | 2022-04-26 | 深圳市世纪创新显示电子有限公司 | PD charging circuit capable of automatically compensating line loss |
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| CN105094189B (en) * | 2014-05-14 | 2018-03-30 | 登丰微电子股份有限公司 | Cable loss compensator circuit and the power circuit with cable loss compensator |
| US11095212B2 (en) * | 2018-09-12 | 2021-08-17 | Vertiv Corporation | Line loss compensating power supplies |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574310A (en) * | 2017-03-07 | 2018-09-25 | 厦门歌乐电子企业有限公司 | A kind of USB interface charging circuit |
| CN109947170A (en) * | 2019-03-22 | 2019-06-28 | 九阳股份有限公司 | A kind of power stability method of insulating pot |
| CN216390547U (en) * | 2021-09-10 | 2022-04-26 | 深圳市世纪创新显示电子有限公司 | PD charging circuit capable of automatically compensating line loss |
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